CN116890423A - Display input device, control device and method for injection molding machine - Google Patents

Abstract

The application relates to a display input device, a control device and a method of an injection molding machine, and provides a technology for improving the precision of injection molded products and protecting machinery. The injection molding machine includes an injection member provided in a cylinder for heating a molding material, and an injection driving source for filling the molding material in the mold device by advancing the injection member. The display input device of the injection molding machine displays setting screen information for setting operation and enables a user to input the setting information. The setting screen information includes a limiting speed input field capable of setting a retracting speed limiting value for limiting the retracting speed of the injection member and a forward speed limiting value for limiting the forward speed of the injection member in a pressure maintaining step of controlling the injection driving source so that the filling pressure applied from the injection member to the molding material becomes a predetermined value.

Description

Display input device, control device and method for injection molding machine

Technical Field

The present application claims priority based on japanese patent application No. 2022-056959 filed on 3 months of 2022, 30. The entire contents of this japanese application are incorporated by reference into the present specification.

The present invention relates to a display input device of an injection molding machine, a control device of an injection molding machine, and a control method of an injection molding machine.

Background

The injection molding machine includes a cylinder for heating a molding material, an injection member provided in the cylinder, an injection driving source for filling the molding material in the mold device by advancing the injection member, and a control device for controlling the injection driving source. The control device sequentially performs the filling process and the pressure maintaining process. The filling step is a step of filling the inside of the mold device with the molding material by controlling the injection driving source so that the actual value of the moving speed of the injection member becomes a set value. The pressure maintaining step is a step of controlling the injection driving source so that the actual value of the filling pressure applied to the molding material from the injection member becomes a set value, thereby supplementing the insufficient amount of the molding material caused by the cooling shrinkage in the mold apparatus.

The switching from the filling process to the holding pressure process is also called V/P switching. After the V/P switching is performed, when the actual value of the filling pressure is greater than the set value, the injection molding machine withdraws the injection member so that the actual value of the filling pressure becomes smaller. Patent document 1 describes the following: by setting the limit value for the retraction speed of the injection member in the pressure maintaining step, it is possible to eliminate the adverse effect on the quality of the molded product caused by the high-speed retraction of the screw in the pressure maintaining step.

Patent document 1: japanese patent No. 3917459

In the pressure maintaining process, whether the screw is transited to the backward movement or the screw is continuously advanced depends on the difference in the filling pressure after the V/P switching. Since the filling pressure varies due to various influences such as the state of the molding material and the state of the mold device, the injection molding machine automatically controls the advance or the retreat of the pressure maintaining process by the control device. Further, the progress speed in the pressure maintaining step by injection molding may be too high, which may cause damage to equipment of the injection molding machine and molding failure of the molded article.

Disclosure of Invention

The present invention has been made in view of the above-described circumstances, and provides a technique capable of protecting a machine in injection molding.

According to one aspect of the present invention, there is provided a display input device for an injection molding machine including an injection member provided in a cylinder for heating a molding material and an injection driving source for filling the molding material in a mold device by advancing the injection member, the display input device displaying setting screen information for setting operation to input setting information to a user, wherein the setting screen information includes a speed limit input field in which a speed limit value for limiting a speed of the injection member to be advanced can be set and a speed limit value for limiting the speed of the injection member to be advanced can be set in a pressure maintaining step for controlling the injection driving source so that a filling pressure acting on the molding material from the injection member becomes a predetermined value.

ADVANTAGEOUS EFFECTS OF INVENTION

The invention relates to a display input device of an injection molding machine, a control device of the injection molding machine and a control method of the injection molding machine, which can protect machinery and improve molding precision of molded products in injection molding.

Drawings

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment.

Fig. 2 is a diagram showing a state at the time of mold closing of the injection molding machine according to the embodiment.

Fig. 3 is a diagram showing an example of the constituent elements of the control device in terms of functional blocks.

Fig. 4 is a diagram showing an example of a process of a molding cycle.

Fig. 5 is a diagram showing an example of the injection control unit.

Fig. 6 is a graph showing an example of changes in screw speed, filling pressure, and screw position with time.

Fig. 7 is a diagram showing an example of setting screen information.

Description of symbols

10-injection molding machine, 310-cylinder, 330-screw, 350-injection motor, 700-control device, 770-touch panel, 771-set screen information, 772-limit speed input field, V1-reverse speed limit value, V2-forward speed limit value.

Detailed Description

The mode for carrying out the present invention will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and overlapping description thereof may be omitted.

(injection Molding machine)

Fig. 1 is a diagram showing a state at the end of mold opening of an injection molding machine according to an embodiment. Fig. 2 is a diagram showing a state at the time of mold closing of the injection molding machine according to the embodiment. In the present specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction represent horizontal directions, and the Z-axis direction represents vertical directions. When the mold clamping device 100 is horizontal, the X-axis direction is the mold opening/closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side in the Y-axis direction is referred to as the operation side, and the positive side in the Y-axis direction is referred to as the opposite side to the operation side.

As shown in fig. 1 to 2, the injection molding machine 10 includes: a mold clamping device 100 for opening and closing the mold device 800; an ejector 200 for ejecting the molded article molded by the mold device 800; an injection device 300 injecting a molding material to the mold device 800; a moving device 400 for advancing and retreating the injection device 300 with respect to the mold device 800; a control device 700 for controlling the respective constituent elements of the injection molding machine 10; and a frame 900 for supporting the components of the injection molding machine 10. The frame 900 includes: a mold clamping unit frame 910 for supporting the mold clamping unit 100; and an injection device frame 920 supporting the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively provided on the bottom plate 2 via horizontal adjustment casters 930. The control device 700 is disposed in the internal space of the injection device frame 920. The following describes the respective constituent elements of the injection molding machine 10.

(mold clamping device)

In the description of the mold clamping apparatus 100, the moving direction (for example, the positive X-axis direction) of the movable platen 120 during mold closing is set to the front, and the moving direction (for example, the negative X-axis direction) of the movable platen 120 during mold opening is set to the rear.

The mold clamping device 100 performs mold closing, pressure increasing, mold clamping, pressure releasing, and mold opening of the mold device 800. The mold apparatus 800 includes a stationary mold 810 and a movable mold 820.

The mold clamping device 100 is, for example, horizontal, and the mold opening/closing direction is horizontal. The mold clamping device 100 includes a fixed platen 110 to which a fixed mold 810 is attached, a movable platen 120 to which a movable mold 820 is attached, and a moving mechanism 102 that moves the movable platen 120 relative to the fixed platen 110 in a mold opening/closing direction.

The stationary platen 110 is fixed relative to the clamp frame 910. A stationary mold 810 is mounted on a surface of the stationary platen 110 opposite to the movable platen 120.

The movable platen 120 is disposed so as to be movable in the mold opening/closing direction with respect to the mold clamping device frame 910. A guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910. The movable mold 820 is attached to a surface of the movable platen 120 facing the fixed platen 110.

The moving mechanism 102 performs mold closing, pressure increasing, mold closing, pressure releasing, and mold opening of the mold apparatus 800 by advancing and retracting the movable platen 120 relative to the fixed platen 110. The moving mechanism 102 includes a toggle base 130 disposed at a distance from the fixed platen 110, a link 140 connecting the fixed platen 110 and the toggle base 130, a toggle mechanism 150 moving the movable platen 120 relative to the toggle base 130 in the mold opening/closing direction, a mold clamping motor 160 operating the toggle mechanism 150, a motion conversion mechanism 170 converting the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjustment mechanism 180 adjusting the distance between the fixed platen 110 and the toggle base 130.

The toggle seat 130 is disposed at a distance from the fixed platen 110, and is mounted on the clamping device frame 910 so as to be movable in the mold opening/closing direction. The toggle mount 130 may be configured to be movable along a guide provided on the clamp frame 910. The guide of the toggle seat 130 may be common to the guide 101 of the movable platen 120.

In the present embodiment, the stationary platen 110 is fixed to the clamping device frame 910, and the toggle mount 130 is disposed so as to be movable in the mold opening and closing direction with respect to the clamping device frame 910, but the toggle mount 130 may be fixed to the clamping device frame 910, and the stationary platen 110 may be disposed so as to be movable in the mold opening and closing direction with respect to the clamping device frame 910.

The connecting rod 140 connects the fixed platen 110 and the toggle base 130 with a space L therebetween in the mold opening and closing direction. Multiple (e.g., 4) connecting rods 140 may be used. The plurality of tie bars 140 are arranged parallel to the mold opening and closing direction and extend according to the mold clamping force. A link strain detector 141 detecting strain of the link 140 may be provided on at least 1 link 140. The link strain detector 141 transmits a signal indicating the detection result to the control device 700. The detection result of the tie bar strain detector 141 is used for detection of the clamping force or the like.

In the present embodiment, the tie bar strain detector 141 is used as a mold clamping force detector for detecting a mold clamping force, but the present invention is not limited thereto. The mold clamping force detector is not limited to the strain gauge type, but may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the mounting position thereof is not limited to the tie bar 140.

The toggle mechanism 150 is disposed between the movable platen 120 and the toggle base 130, and moves the movable platen 120 with respect to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening and closing direction, and a pair of link groups that are bent and extended by the movement of the crosshead 151. The pair of link groups includes a 1 st link 152 and a 2 nd link 153, which are connected to each other by a pin or the like so as to be freely bendable. The 1 st link 152 is attached to the movable platen 120 by a pin or the like so as to be swingable. The 2 nd link 153 is attached to the toggle base 130 by a pin or the like so as to be swingable. The 2 nd link 153 is attached to the crosshead 151 via the 3 rd link 154. When the crosshead 151 is advanced and retracted relative to the toggle mount 130, the 1 st link 152 and the 2 nd link 153 are extended and retracted to advance and retract the movable platen 120 relative to the toggle mount 130.

The structure of the toggle mechanism 150 is not limited to the structure shown in fig. 1 and 2. For example, in fig. 1 and 2, the number of nodes of each link group is 5, but may be 4, or one end of the 3 rd link 154 may be connected to the node of the 1 st link 152 and the 2 nd link 153.

The clamp motor 160 is mounted to the toggle mount 130 and operates the toggle mechanism 150. The clamp motor 160 advances and retreats the crosshead 151 with respect to the toggle mount 130, and stretches the 1 st link 152 and the 2 nd link 153 to advance and retreat the movable platen 120 with respect to the toggle mount 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.

The motion conversion mechanism 170 converts the rotational motion of the clamp motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing process, a pressure increasing process, a mold clamping process, a pressure releasing process, a mold opening process, and the like under the control of the control device 700.

In the mold closing step, the movable platen 120 is advanced by driving the mold clamping motor 160 to advance the crosshead 151 to the mold closing end position at a set movement speed so that the movable mold 820 is brought into contact with the fixed mold 810. For example, the position and the moving speed of the crosshead 151 are detected using a clamp motor encoder 161 or the like. The clamp motor encoder 161 detects the rotation of the clamp motor 160, and transmits a signal indicating the detection result to the control device 700.

The crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the clamp motor encoder 161, and a conventional detector may be used. The movable platen position detector for detecting the position of the movable platen 120 and the movable platen moving speed detector for detecting the moving speed of the movable platen 120 are not limited to the mold clamping motor encoder 161, and a conventional detector may be used.

In the pressure increasing step, the clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing end position to the clamping position, thereby generating clamping force.

In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping step, the mold clamping force generated in the pressure increasing step is maintained. In the mold clamping step, a cavity space 801 (see fig. 2) is formed between the movable mold 820 and the fixed mold 810, and the injection device 300 fills the cavity space 801 with a liquid molding material. The filled molding material is cured, thereby obtaining a molded article.

The number of cavity spaces 801 may be 1 or more. In the latter case, a plurality of molded articles can be obtained at the same time. An insert may be disposed in a portion of the cavity space 801 and another portion of the cavity space 801 may be filled with molding material. A molded article in which the insert and the molding material are integrated can be obtained.

In the decompression step, the clamping motor 160 is driven to retract the crosshead 151 from the clamping position to the mold opening start position, and the movable platen 120 is retracted to reduce the clamping force. The mold opening start position and the mold closing end position may be the same position.

In the mold opening step, the movable platen 120 is retracted by driving the mold clamping motor 160 to retract the crosshead 151 from the mold opening start position to the mold opening end position at a set movement speed, so that the movable mold 820 is separated from the fixed mold 810. Then, the ejector 200 ejects the molded article from the mold 820.

The setting conditions in the mold closing step, the pressure increasing step, and the mold closing step are set in a unified manner as a series of setting conditions. For example, the moving speed, the position (including the mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position) and the mold clamping force of the crosshead 151 in the mold closing step and the pressure increasing step are set in a unified manner as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing end position, and the mold closing position are arranged in this order from the rear side to the front side, and indicate the start point and the end point of the section in which the moving speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set. Only one of the mold clamping position and the mold clamping force may be set.

The conditions for setting in the decompression step and the mold opening step are set in the same manner. For example, the moving speed and the position (the mold opening start position, the moving speed switching position, and the mold opening end position) of the crosshead 151 in the decompression step and the mold opening step are set in a unified manner as a series of setting conditions. The mold opening start position, the movement speed switching position, and the mold opening end position are arranged in this order from the front side to the rear side, and indicate the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set. The mold opening start position and the mold closing end position may be the same position. The mold opening end position and the mold closing start position may be the same position.

In addition, instead of the moving speed, position, etc. of the crosshead 151, the moving speed, position, etc. of the movable platen 120 may be set. In addition, the clamping force may be set instead of the position of the crosshead 151 (for example, the clamping position) and the position of the movable platen 120.

However, the toggle mechanism 150 amplifies the driving force of the clamp motor 160 and transmits it to the movable platen 120. Its magnification is also called toggle magnification. The toggle magnification changes according to an angle θ (hereinafter, also referred to as "link angle θ") formed by the 1 st link 152 and the 2 nd link 153. The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180 °, the toggle magnification becomes maximum.

When the thickness of the mold device 800 changes due to replacement of the mold device 800, temperature change of the mold device 800, or the like, mold thickness adjustment is performed to obtain a predetermined clamping force at the time of clamping. In the die thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle base 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time when the movable die 820 contacts the fixed die 810.

The mold clamping device 100 has a mold thickness adjusting mechanism 180. The die thickness adjustment mechanism 180 adjusts the distance L between the fixed platen 110 and the toggle base 130, thereby performing die thickness adjustment. The timing of the mold thickness adjustment is performed, for example, during a period from the end of the molding cycle to the start of the next molding cycle. The die thickness adjusting mechanism 180 includes, for example: a screw shaft 181 formed at a rear end portion of the connection rod 140; a screw nut 182 rotatably held in the toggle seat 130 and being non-retractable; and a die thickness adjusting motor 183 for rotating a screw nut 182 screwed to the screw shaft 181.

A screw shaft 181 and a screw nut 182 are provided for each of the connection rods 140. The rotational driving force of the die thickness adjusting motor 183 may be transmitted to the plurality of lead screw nuts 182 via the rotational driving force transmitting portion 185. A plurality of lead screw nuts 182 can be rotated synchronously. Further, by changing the transmission path of the rotational driving force transmission unit 185, the plurality of lead screw nuts 182 can be rotated individually.

The rotational driving force transmitting portion 185 is constituted by a gear or the like, for example. At this time, driven gears are formed on the outer periphery of each screw nut 182, a driving gear is mounted on the output shaft of the die thickness adjusting motor 183, and an intermediate gear engaged with the driven gears and the driving gear is rotatably held at the center portion of the toggle seat 130. In addition, the rotational driving force transmitting portion 185 may be formed of a belt, a pulley, or the like instead of the gear.

The operation of the die thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the die thickness adjustment motor 183 to rotate the lead screw nut 182. As a result, the position of the toggle housing 130 relative to the connecting rod 140 is adjusted, and the interval L between the fixed platen 110 and the toggle housing 130 is adjusted. In addition, a plurality of die thickness adjusting mechanisms may be used in combination.

The interval L is detected using a die thickness adjustment motor encoder 184. The die thickness adjustment motor encoder 184 detects the rotation amount and rotation direction of the die thickness adjustment motor 183, and transmits a signal indicating the detection result to the control device 700. The detection result of the die thickness adjustment motor encoder 184 is used for monitoring and controlling the position and the interval L of the toggle seat 130. The toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the die thickness adjusting motor encoder 184, and a conventional detector may be used.

The mold clamping device 100 may have a mold temperature regulator that regulates the temperature of the mold device 800. The die device 800 has a flow path for the temperature control medium therein. The mold temperature regulator regulates the temperature of the temperature regulating medium supplied to the flow path of the mold device 800, thereby regulating the temperature of the mold device 800.

The mold clamping device 100 of the present embodiment is a horizontal mold opening/closing direction, but may be a vertical mold opening/closing direction.

The mold clamping device 100 of the present embodiment includes the mold clamping motor 160 as a driving unit, but may include a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may include a linear motor for mold opening and closing, or may include an electromagnet for mold clamping.

(ejector device)

In the description of the ejector 200, the moving direction (for example, the positive X-axis direction) of the movable platen 120 during mold closing is set to the front, and the moving direction (for example, the negative X-axis direction) of the movable platen 120 during mold opening is set to the rear, similarly to the description of the mold clamping device 100 and the like.

The ejector 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120. The ejector 200 includes: an ejector rod 210 ejecting the molded article from the mold device 800; and a driving mechanism 220 for moving the ejector rod 210 in the moving direction (X-axis direction) of the movable platen 120.

The ejector rod 210 is disposed so as to be movable in and out of the through hole of the movable platen 120. The front end of the ejector rod 210 contacts the ejector plate 826 of the movable mold 820. The tip end of the ejector rod 210 may or may not be connected to the ejector plate 826.

The driving mechanism 220 includes, for example, an ejector motor and a motion conversion mechanism that converts rotational motion of the ejector motor into linear motion of the ejector rod 210. The motion conversion mechanism comprises a screw shaft and a screw nut screwed with the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejector 200 performs the ejection process under the control of the control device 700. In the ejection step, the ejector rod 210 is advanced from the standby position to the ejection position at a set movement speed, and the ejector plate 826 is advanced to eject the molded article. Then, the ejector motor is driven to retract the ejector rod 210 at a set movement speed, and the ejector plate 826 is retracted to the original standby position.

The position and moving speed of the ejector rod 210 are detected, for example, using an ejector motor encoder. The ejector motor encoder detects the rotation of the ejector motor and transmits a signal indicating the detection result to the control device 700. The ejector rod position detector that detects the position of the ejector rod 210 and the ejector rod movement speed detector that detects the movement speed of the ejector rod 210 are not limited to the ejector motor encoder, and a conventional detector may be used.

(injection device)

In the description of the injection device 300, the direction of movement of the screw 330 (for example, the negative X-axis direction) during filling is set to the front, and the direction of movement of the screw 330 (for example, the positive X-axis direction) during metering is set to the rear, unlike the description of the mold clamping device 100 and the description of the ejector 200.

The injection device 300 is provided on the slide base 301, and the slide base 301 is disposed so as to be movable relative to the injection device frame 920. The injection device 300 is disposed so as to be movable in and out of the mold device 800. The injection device 300 is in contact with the mold device 800 and fills the cavity space 801 in the mold device 800 with molding material. The injection device 300 includes, for example, a cylinder 310 for heating a molding material, a nozzle 320 provided at a distal end portion of the cylinder 310, a screw 330 rotatably disposed in the cylinder 310, a metering motor 340 for rotating the screw 330, an injection motor 350 for advancing and retreating the screw 330, and a load detector 360 for detecting a load transmitted between the injection motor 350 and the screw 330.

The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The molding material includes, for example, a resin or the like. The molding material is formed into, for example, a pellet shape, and is supplied in a solid state to the supply port 311. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear portion of the cylinder block 310. A 1 st heater 313 such as a belt heater and a 1 st temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

The cylinder 310 is divided into a plurality of regions along an axial direction (e.g., an X-axis direction) of the cylinder 310. The 1 st heater 313 and the 1 st temperature detector 314 are provided in each of the plurality of regions. The control device 700 controls the 1 st heater 313 so that the temperature detected by the 1 st temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310, and presses the die device 800. A 2 nd heater 323 and a 2 nd temperature detector 324 are provided on the outer periphery of the nozzle 320. The control device 700 controls the 2 nd heater 323 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is rotatably disposed in the cylinder 310 and is movable forward and backward. When the screw 330 is rotated, the molding material is conveyed forward along the spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being conveyed forward. As the molding material in the liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. Then, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold device 800.

The check ring 331 is attached to the front of the screw 330 so as to be movable forward and backward, and the check ring 331 serves as a check valve to prevent the molding material from flowing backward from the front of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the check ring 331 is pushed rearward by the pressure of the molding material in front of the screw 330, and retreats relatively to the screw 330 to a closed position (see fig. 2) blocking the flow path of the molding material. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, when the screw 330 is rotated, the check ring 331 is pushed forward by the pressure of the molding material conveyed forward along the spiral groove of the screw 330, and relatively advances to the open position (refer to fig. 1) for opening the flow path of the molding material with respect to the screw 330. Thereby, the molding material is conveyed to the front of the screw 330.

Check ring 331 may be either a co-rotating type that rotates with screw 330 or a non-co-rotating type that does not rotate with screw 330.

In addition, the injection device 300 may have a driving source that advances and retreats the check ring 331 with respect to the screw 330 between the open position and the closed position.

The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

Injection motor 350 advances and retracts screw 330. A motion conversion mechanism or the like for converting the rotational motion of injection motor 350 into the linear motion of screw 330 is provided between injection motor 350 and screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, etc. may be provided between the screw shaft and the screw nut. The driving source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder or the like.

The load detector 360 detects a load transmitted between the injection motor 350 and the screw 330. The detected load is converted into pressure by the control device 700. The load detector 360 is provided in a transmission path of the load between the injection motor 350 and the screw 330, and detects the load acting on the load detector 360.

The load detector 360 transmits a signal of the detected load to the control device 700. The load detected by the load detector 360 is converted into a pressure acting between the screw 330 and the molding material, and is used for controlling and monitoring the back pressure of the screw 330 and the pressure acting on the molding material from the screw 330, etc. by the pressure received by the screw 330 from the molding material.

The pressure detector for detecting the pressure of the molding material is not limited to the load detector 360, and a conventional detector can be used. For example, a nozzle pressure sensor or an in-mold pressure sensor may be used. The nozzle pressure sensor is provided to the nozzle 320. The mold internal pressure sensor is provided inside the mold device 800.

The injection device 300 performs a metering process, a filling process, a pressure maintaining process, and the like under the control of the control device 700. The filling step and the pressure maintaining step may be collectively referred to as an injection step.

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a set rotational speed, and the molding material is conveyed forward along the spiral groove of the screw 330. Thereby, the molding material is gradually melted. As the molding material in the liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. The rotational speed of screw 330 is detected, for example, using a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and transmits a signal indicating the detection result to the control device 700. The screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

In the metering step, injection motor 350 may be driven to apply a set back pressure to screw 330 in order to limit rapid retraction of screw 330. The back pressure on the screw 330 is detected, for example, using a load detector 360. When the screw 330 is retracted to the metering end position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process ends.

The position and rotation speed of the screw 330 in the metering step are set uniformly as a series of setting conditions. For example, a measurement start position, a rotation speed switching position, and a measurement end position are set. These positions are arranged in order from the front side to the rear side, and indicate the start point and the end point of the section in which the rotational speed is set. The rotational speed is set for each section. The number of rotational speed switching positions may be 1 or a plurality of rotational speed switching positions. The rotational speed switching position may not be set. Back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the cavity space 801 in the mold apparatus 800 is filled with the liquid molding material stored in front of the screw 330. The position and moving speed of the screw 330 are detected, for example, using the injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and transmits a signal indicating the detection result thereof to the control device 700. When the position of the screw 330 reaches the set position, the filling process is switched to the pressure maintaining process (so-called V/P switching). The position where the V/P switch is performed is also referred to as a V/P switch position. The set moving speed of the screw 330 may be changed according to the position, time, etc. of the screw 330.

The position and the moving speed of the screw 330 in the filling process are set uniformly as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a moving speed switching position, and a V/P switching position are set. These positions are arranged in this order from the rear side to the front side, and indicate the start point and the end point of the section in which the movement speed is set. The movement speed is set for each section. The number of the movement speed switching positions may be 1 or plural. The moving speed switching position may not be set.

The upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of the screw 330 is detected by a load detector 360. When the pressure of the screw 330 is below the set pressure, the screw 330 advances at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 is advanced at a movement speed slower than the set movement speed so that the pressure of the screw 330 becomes equal to or lower than the set pressure in order to protect the mold.

In the filling step, after the position of the screw 330 reaches the V/P switching position, the screw 330 may be suspended at the V/P switching position and then V/P switching may be performed. Instead of stopping the screw 330, the screw 330 may be advanced at a slight speed or retracted at a slight speed immediately before the V/P switching. The screw position detector for detecting the position of the screw 330 and the screw movement speed detector for detecting the movement speed of the screw 330 are not limited to the injection motor encoder 351, and a conventional detector may be used.

In the pressure maintaining step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the tip end portion of the screw 330 (hereinafter, also referred to as "holding pressure") is maintained at a set pressure, so that the molding material remaining in the cylinder 310 is pushed to the mold device 800. An insufficient amount of molding material due to cooling shrinkage in the mold device 800 can be replenished. The holding pressure is detected, for example, using a load detector 360. The set value of the holding pressure may be changed according to the elapsed time from the start of the pressure-maintaining process. The holding pressure and the holding time for holding the holding pressure in the plurality of holding pressure steps may be set individually or may be set collectively as a series of setting conditions.

In the pressure maintaining step, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and at the end of the pressure maintaining step, the inlet of the cavity space 801 is blocked by the solidified molding material. This state is called gate sealing, and prevents backflow of molding material from the cavity space 801. After the pressure maintaining process, a cooling process is started. In the cooling step, solidification of the molding material in the cavity space 801 is performed. The metering step may be performed in the cooling step in order to shorten the molding cycle time.

The injection device 300 of the present embodiment is of a coaxial screw type, but may be of a pre-molding type or the like. The injection device of the pre-molding method supplies the molding material melted in the plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is rotatably disposed so as not to advance and retreat, or the screw is rotatably disposed so as to advance and retreat. On the other hand, in the injection cylinder, the plunger is disposed so as to be movable forward and backward.

The injection device 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is vertical. The mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 may be either horizontal or vertical.

(Mobile device)

In the description of the moving device 400, the moving direction of the screw 330 (for example, the X-axis negative direction) during filling is set to the front, and the moving direction of the screw 330 (for example, the X-axis positive direction) during metering is set to the rear, as in the description of the injection device 300.

The movement device 400 advances and retracts the injection device 300 relative to the mold device 800. The moving device 400 presses the nozzle 320 against the die device 800 to generate a nozzle contact pressure. The traveling apparatus 400 includes a hydraulic pump 410, a motor 420 as a driving source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 has a 1 st port 411 and a 2 nd port 412. The hydraulic pump 410 is a pump capable of rotating in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420 so that a working fluid (for example, oil) is sucked from one of the 1 st port 411 and the 2 nd port 412 and discharged from the other port. The hydraulic pump 410 may suck the working fluid from the tank and discharge the working fluid from any one of the 1 st port 411 and the 2 nd port 412.

The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 by a rotation direction and a rotation torque corresponding to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servo motor.

Hydraulic cylinder 430 has a cylinder body 431, a piston 432, and a piston rod 433. Cylinder body 431 is fixed relative to injection device 300. Piston 432 divides the interior of cylinder body 431 into a front chamber 435, which is the 1 st chamber, and a rear chamber 436, which is the 2 nd chamber. The piston rod 433 is fixed with respect to the fixed platen 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the 1 st port 411 of the hydraulic pump 410 via the 1 st flow path 401. The working fluid discharged from the 1 st port 411 is supplied to the front chamber 435 via the 1 st flow path 401, and the injection device 300 is pushed forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810. The front chamber 435 functions as a pressure chamber that generates a nozzle contact pressure of the nozzle 320 by the pressure of the working fluid supplied from the hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the 2 nd port 412 of the hydraulic pump 410 via the 2 nd flow path 402. The working fluid discharged from the 2 nd port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the 2 nd flow path 402, whereby the injection device 300 is pushed rearward. The injection device 300 is retracted and the nozzle 320 is separated from the stationary mold 810.

In the present embodiment, the moving device 400 includes the hydraulic cylinder 430, but the present invention is not limited to this. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts rotational motion of the electric motor into linear motion of the injection device 300 may be used.

(control device)

As shown in fig. 1 to 2, the control device 700 is configured by a computer, for example, and includes a CPU (Central Processing Unit (central processing unit)) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704. The control device 700 performs various controls by causing the CPU701 to execute a program stored in the storage medium 702. The control device 700 receives a signal from the outside through the input interface 703 and transmits a transmission signal to the outside through the output interface 704.

The control device 700 repeatedly performs a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure maintaining process, a cooling process, a pressure releasing process, a mold opening process, an ejection process, and the like, to thereby repeatedly manufacture a molded product. A series of operations for obtaining a molded product, for example, an operation from the start of a metering process to the start of the next metering process is also referred to as "injection" or "molding cycle". The time required for one shot is also referred to as "molding cycle time" or "cycle time".

The one-shot molding cycle includes, for example, a metering step, a mold closing step, a pressure increasing step, a mold closing step, a filling step, a pressure maintaining step, a cooling step, a pressure releasing step, a mold opening step, and an ejection step in this order. The sequence here is the sequence in which the respective steps are started. The filling step, the pressure maintaining step, and the cooling step are performed during the mold clamping step. The start of the mold clamping process may be coincident with the start of the filling process. The end of the decompression step corresponds to the start of the mold opening step.

In addition, a plurality of steps may be performed simultaneously for the purpose of shortening the molding cycle time. For example, the metering step may be performed in the cooling step of the previous molding cycle, or may be performed during the mold clamping step. In this case, the mold closing step may be performed at the beginning of the molding cycle. The filling process may be started in the mold closing process. The ejection step may be started in the mold opening step. When an opening/closing valve for opening/closing the flow path of the nozzle 320 is provided, the mold opening process may be started in the metering process. Even if the mold opening process is started in the metering process, the molding material does not leak from the nozzle 320 as long as the opening/closing valve closes the flow path of the nozzle 320.

The one-shot molding cycle may include steps other than the metering step, the mold closing step, the pressure increasing step, the mold closing step, the filling step, the pressure maintaining step, the cooling step, the pressure releasing step, the mold opening step, and the ejection step.

For example, the pre-metering suck-back step of retracting the screw 330 to a preset metering start position may be performed after the end of the pressure maintaining step and before the start of the metering step. The pressure of the molding material stored in front of the screw 330 can be reduced before the start of the metering process, and the screw 330 can be prevented from rapidly backing up when the metering process is started.

After the completion of the metering step and before the start of the filling step, the post-metering suck-back step of retracting the screw 330 to a preset filling start position (also referred to as "injection start position") may be performed. The pressure of the molding material stored in front of the screw 330 can be reduced before the start of the filling process, and leakage of the molding material from the nozzle 320 can be prevented before the start of the filling process.

The control device 700 is connected to an operation device 750 that receives an input operation from a user and a display device 760 that displays a screen. The operation device 750 and the display device 760 are constituted by, for example, a touch panel 770 (display input device), and may be integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. Information such as the setting of the injection molding machine 10, the current state of the injection molding machine 10, and the like may be displayed on the screen of the touch panel 770. Further, an operation unit such as a button or an input field for receiving an input operation by a user may be displayed on the screen of the touch panel 770. The touch panel 770 as the operation device 750 detects an input operation of a user on a screen, and outputs a signal corresponding to the input operation to the control device 700. Thus, for example, the user can perform setting (including input of a set value) of the injection molding machine 10 by operating the operation unit provided on the screen while checking information displayed on the screen. The user can operate the operation unit provided on the screen, and thereby operate the injection molding machine 10 corresponding to the operation unit. The operation of the injection molding machine 10 may be, for example, the operations (including stopping) of the mold clamping device 100, the ejector 200, the injection device 300, the moving device 400, and the like. The operation of the injection molding machine 10 may be, for example, switching of a screen displayed on the touch panel 770 as the display device 760.

The operation device 750 and the display device 760 according to the present embodiment are integrated into the touch panel 770, but may be provided independently. Further, a plurality of operation devices 750 may be provided. The operation device 750 and the display device 760 are disposed on the operation side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the stationary platen 110).

(detailed description of the control device)

Next, an example of the constituent elements of the control device 700 will be described with reference to fig. 3. The functional blocks illustrated in fig. 3 are conceptual functional blocks, and are not necessarily physically configured as illustrated. All or part of the functional blocks may be functionally or physically distributed and integrated in arbitrary units. All or any part of the processing functions performed by the respective functional blocks can be realized by a program executed by the CPU or realized by hardware based on wired logic.

As shown in fig. 3, the control device 700 includes, for example, a mold clamping control unit 711, an ejection control unit 712, an injection control unit 713, a metering control unit 714, and a setting unit 715. The mold clamping control unit 711 controls the mold clamping device 100, and performs the mold closing step, the pressure increasing step, the mold clamping step, the pressure releasing step, and the mold opening step shown in fig. 4. The ejection control unit 712 controls the ejection device 200 and performs the ejection process. The injection controller 713 controls the injection drive source of the injection device 300 and performs an injection process. The injection driving source is, for example, the injection motor 350, but may be a hydraulic cylinder or the like. The injection process includes a filling process and a pressure maintaining process. The injection step is performed in a mold clamping step. The metering control unit 714 controls the metering drive source of the injection device 300, and performs the metering process. The metering drive source is, for example, the metering motor 340, but may be a hydraulic pump or the like. The metering step is performed in the cooling step.

The filling step is a step of controlling the injection driving source so that the actual value of the moving speed of the injection member provided in the cylinder 310 becomes a set value. The filling step is a step of filling the inside of the mold device 800 with the liquid molding material accumulated in front of the injection member by moving the injection member forward. The injection member is, for example, a screw 330 (see fig. 1 and 2), but may be a plunger.

The speed of movement of the injection member is detected using a speed detector. The speed detector is, for example, an injection motor encoder 351. In the filling step, the injection member advances, so that the pressure (hereinafter, also referred to as "filling pressure") acting on the molding material from the injection member increases. The filling step may include a step of suspending the injection member or a step of retracting the injection member immediately before the pressure maintaining step.

The pressure maintaining step is a step of controlling the injection driving source so that the actual value of the filling pressure becomes a set value. The pressure maintaining step is a step of pushing the injection member forward to supplement the insufficient amount of molding material in the mold device 800 due to cooling shrinkage. The filling pressure is detected using a pressure detector such as load detector 360. As the pressure detector, a nozzle pressure sensor or a mold internal pressure sensor may be used.

The pressure maintaining process is controlled by the injection controller 713. As shown in fig. 5, the injection controller 713 includes, for example, a speed setting unit 713a and a command generating unit 713b. The speed setting unit 713a creates a set value of the speed of the injection member based on the deviation between the set value of the filling pressure and the actual value. The command generating unit 713b generates a command (for example, a current command) to the injection drive source based on a deviation between a set value and an actual value of the speed of the injection member. The injection driving source is, for example, an injection motor 350. The injection driving source is driven in accordance with the command generated by the command generating unit 713b.

The speed setting unit 713a creates a set value of the speed of the injection member so that the actual value of the filling pressure becomes the set value. The actual value of the filling pressure is obtained using a pressure detector such as load detector 360. The speed setting unit 713a creates a set value of the speed of the injection member, for example, by PID calculation or PI calculation.

The command generating unit 713b generates a command to the injection drive source so that the actual value of the speed of the injection member becomes a set value. The actual value of the velocity of the injection member is obtained using a velocity detector such as injection motor encoder 351. The command generating unit 713b generates a command to the injection drive source by, for example, PID operation or PI operation.

The injection controller 713 also includes a retraction speed limiter 713c and a forward speed limiter 713d. The reverse speed limiting portion 713c and the forward speed limiting portion 713d are arranged between the speed setting portion 713a and the command generating portion 713b, and are connected in series. The order of arrangement of the reverse speed limiter 713c and the forward speed limiter 713d is not limited to the example of fig. 5, and the forward speed limiter 713d and the reverse speed limiter 713c may be arranged in this order. The injection controller 713 may be configured to include a speed limiter, not shown, that integrates the reverse speed limiter 713c and the forward speed limiter 713d.

When the injection member retreats in the pressure maintaining process, the retreating speed limiter 713c limits the retreating speed of the injection member to a preset retreating speed limit value V1 (absolute value) or less. In this way, in the pressure maintaining step, adverse effects on the quality of the molded product caused by the high-speed retraction of the injection member can be eliminated. For example, the reverse speed limiting unit 713c compares the set value of the speed produced by the speed setting unit 713a with the reverse speed limiting value V1. As shown in fig. 6 (a), when the forward movement of the injection member is positive, the set value of the speed at the time of backward movement becomes negative. When the injection member retreats, the retreating speed limiter 713c compares the retreating speed (negative speed) with the negative retreating speed limit value V1, and outputs a speed equal to or higher than the retreating speed limit value V1 (speed close to zero) as a set value of the speed to the advancing speed limiter 713d. When the injection member advances, the retraction speed limiting portion 713c outputs the set value of the speed generated by the speed setting portion 713a as it is.

When the injection member advances in the pressure maintaining process, the advance speed limiting portion 713d limits the advance speed of the injection member to a preset advance speed limiting value V2 (absolute value) or less. In this way, in the pressure maintaining step, adverse effects on the quality of the molded product caused by the high-speed advancement of the injection member can be eliminated. For example, the forward speed limiter 713d compares the set value of the speed output from the reverse speed limiter 713c with the forward speed limiter V2. Since the injection member is positive when advancing, a speed equal to or lower than the advance speed limit value V2 (a speed close to zero) is outputted to the command generating unit 713b as a speed set value. When the injection member retreats, the forward speed limiter 713d outputs the set value of the speed output from the backward speed limiter 713c as it is.

Returning to fig. 3, the setting unit 715 of the control device 700 enables the user to set the retraction speed limit value V1 and the advance speed limit value V2 of the injection member in the pressure maintaining process. For example, the setting unit 715 generates setting screen information 771 as shown in fig. 7, in which settings for the pressure maintaining process can be input, and displays the setting screen information 771 on the touch panel 770. The user can set the reverse speed limit value V1 and the forward speed limit value V2 by inputting setting information on the setting screen information 771 of the touch panel 770.

The setting screen information 771 has, for example, a speed limit input field 772 for inputting a reverse speed limit value V1 and a forward speed limit value V2. The speed limit input field 772 includes, for example, a reverse speed input field 772a for inputting a reverse speed limit value V1 and a forward speed input field 772b for inputting a forward speed limit value V2 at different positions. In fig. 7, the forward speed input field 772b is referred to as a hold pressure in-process speed for easy recognition by the user. In this way, the speed limit input field 772 allows the user to set the speed limit V1 and the speed limit V2 for the backward movement, respectively, so that the user can set the speeds of the injection member in the pressure maintaining process at the forward movement and the backward movement in detail.

In addition, the setting screen information 771 in fig. 7 displays a pressure-maintaining information input field 773 for inputting other information of the pressure-maintaining process between the reverse speed input field 772a and the forward speed input field 772b. This can suppress an input error of the reverse speed limit value V1 and the forward speed limit value V2 by the user.

The control device 700 may be configured to prevent the retraction speed and the forward speed from being limited according to the user's intention with respect to the retraction or the forward movement of the injection member in the pressure maintaining step. For example, the setting unit 715 can input or select the restriction closing information (in the lower diagram of fig. 7, cut-off) of the content that is not restricted in the reverse speed input field 772a and the forward speed input field 772b, thereby setting the reverse speed limit value V1 or the forward speed limit value V2 to be unnecessary at the instruction of the user. When receiving the setting of the restriction closing information, the injection controller 713 controls the injection drive source by transmitting the set value of the speed setting unit 713a to the command generator 713b without operating the closed restriction units (the backward speed restriction unit 713c and the forward speed restriction unit 713 d). Thus, the injection molding machine 10 performs an operation that does not limit the backward movement speed or the forward movement speed according to the user's intention, and can prioritize the efficiency of molding the molded product.

The speed limit input field 772 may have 1 speed input field (not shown), and both the reverse speed limit value V1 and the forward speed limit value V2 may be set based on 1 value input to the speed input field by the user. This makes it possible to set the speed at which the pressure maintaining process is performed more easily.

The setting unit 715 is preferably configured to be unable to input the forward speed and the backward speed equal to or higher than the mechanical limit of the injection member. For example, when the user inputs the speed limit input field 772 that is equal to or greater than the mechanical limit of the injection member, the setting unit 715 may display error information indicating the speed range of the mechanical limit through a pop-up window or the like, thereby requesting the user to re-input the limit value.

As described above, the display input device (touch panel 770) of the injection molding machine 10 allows the user to set the retraction speed limit value V1 and the advance speed limit value V2 of the injection member in the pressure maintaining step via the setting screen information 771. Thus, the injection molding machine 10 can suppress the speed in both the backward movement and the forward movement of the injection member when the pressure maintaining process is performed, and can avoid molding failure and mechanical damage caused by the high speed. That is, the injection molding machine 10 can protect the machine and improve the precision of injection molded articles. The display input device of the injection molding machine 10 is not limited to the touch panel 770 in which the operation device 750 and the display device 760 are integrated, and may be configured separately. For example, the input device may be a keyboard, a mouse, buttons, a remote controller, a microphone for inputting sound, and the like, and the display device may be a liquid crystal monitor, a CRT monitor, and the like.

The setting screen information 771 includes a reverse speed input field 772a and a forward speed input field 772b at different positions, and thus the user can set the reverse speed limit value V1 and the forward speed limit value V2 in detail, respectively. Thus, the injection molding machine 10 can control the operation of the injection member in the pressure maintaining process with high accuracy.

Alternatively, the injection molding machine 10 may be configured to automatically set the reverse speed limit value V1 and the forward speed limit value V2 in the control device 700 independently of the user. For example, the control device 700 may calculate the optimal retraction speed limit value V1 and the advance speed limit value V2 based on the molding material information, the mold device information, the speed of the screw 330 in the previous pressure maintaining process, the filling pressure, and the like.

The injection molding machine 10 according to the present embodiment is basically configured as described above, and operations of the filling step and the pressure maintaining step are described below with reference to fig. 6. Fig. 6 is a graph illustrating a change in the speed of the screw (injection member) with time, a change in the filling pressure with time, and a change in the position of the screw (injection member) with time, (a) shows when the injection member is retracted, and (B) shows when the injection member is advanced. The screw position is indicated by a distance from the forward limit position of the movable range of the screw 330, and the further the screw 330 moves backward from the forward limit position, the greater the distance indicating the screw position.

In fig. 6 (a), t0 represents the start time of the filling process, t1 represents the time of V/P switching, t2 represents the time when the retraction speed (absolute value) of the screw speed becomes equal to or higher than the retraction speed limit value V1, t3 represents the time when the retraction speed becomes smaller than the retraction speed limit value V1, and t4 represents the end time of the pressure maintaining process. In the filling process (t 0 to t 1) of injection molding, when the filling pressure is large, the actual value of the filling pressure is significantly larger than the set value P1 in the holding process after V/P switching (after time t 1). As a result, the screw 330 moves backward in the pressure maintaining step.

At the start of the pressure maintaining process, the retraction speed limiting portion 713c uses the set value of the speed setting portion 713 a. In fig. 6 a, at time t2, the actual value of the retraction speed of screw 330 is equal to or greater than retraction speed limit value V1 (absolute value).

Therefore, after time t2, the retraction speed limiting portion 713c sets the setting value of the retraction speed with the retraction speed limiting value V1 so that the retraction speed of the screw 330 does not exceed the retraction speed limiting value V1. Then, at time t3 when the filling pressure decreases to some extent, the retraction speed limiting portion 713c retracts the screw 330 using the set value of the speed setting portion 713a again. Thus, the injection molding machine 10 can suppress breakage of the screw 330 and molding failure of the molded product in the mold apparatus 800, which are caused by rapid acceleration of the retraction speed of the screw 330 in the pressure maintaining step.

On the other hand, in fig. 6B, t0 represents the start time of the filling process, t1 represents the time of V/P switching, t2 represents the time when the advancing speed (absolute value) of the screw speed becomes equal to or higher than the advancing speed limit value V2, t3 represents the time when the advancing speed becomes smaller than the advancing speed limit value V2, and t4 represents the end time of the pressure maintaining process. In fig. 6 (a) and 6 (B), the advance speed, the retreat speed, and the filling pressure are different from each other in scale, and thus the setting value P1 of the filling pressure is displayed in a staggered manner. As shown in fig. 6B, in the filling process (t 0 to t 1) of the injection molding, since the filling pressure is small, even in the holding process after V/P switching (after time t 1), the actual value of the filling pressure is significantly smaller than the set value P1. As a result, the control device 700 performs an operation of advancing the screw 330 in the pressure maintaining step.

At the start of the pressure maintaining process, the forward speed limiting portion 713d compares the set value of the speed output from the reverse speed limiting portion 713c with the forward speed limiting value V2. In fig. 6B, at time t2, the actual value of the forward speed of screw 330 is equal to or greater than the forward speed limit V2 (absolute value).

Therefore, after time t2, the advance speed limiting unit 713d sets the set value of the advance speed with the advance speed limiting value V2 so that the advance speed of the screw 330 does not exceed the advance speed limiting value V2. Then, at time t3 when the filling pressure increases to some extent, the advance speed limiting portion 713d advances the screw 330 again using the set value of the speed setting portion 713 a. Thus, the injection molding machine 10 can suppress damage to the screw 330 and molding failure in the mold apparatus 800, which are caused by rapid acceleration of the advancing speed of the screw 330 in the pressure maintaining step.

As described above, the control device 700 and the control method of the injection molding machine 10 according to the present embodiment can easily set the speed of the injection member in the pressure maintaining step within the range of the backward speed limit V1 and the forward speed limit V2. Therefore, the injection molding machine 10 can protect the machine and improve the molding accuracy of the injection molded article.

In all respects, the display input device (touch panel 770) of the injection molding machine 10, the control device 700 of the injection molding machine 10, and the control method of the injection molding machine 10 according to the embodiment of the present disclosure are illustrative, and not restrictive. The embodiments can be modified and improved in various ways without departing from the scope and gist of the embodiments. The matters described in the above-described embodiments can be combined with other configurations within a range not inconsistent with each other.

Claims (6)

1. A display input device for an injection molding machine comprising an injection member provided in a cylinder for heating a molding material and an injection driving source for filling the molding material in a mold device by advancing the injection member, the display input device displaying setting screen information for setting operation and allowing a user to input setting information,

the setting screen information includes a speed limit input field, and in the pressure maintaining step of controlling the injection driving source so that the filling pressure applied from the injection member to the molding material becomes a predetermined value, a speed limit value for limiting the speed of the injection member and a speed limit value for limiting the speed of the injection member can be set in the speed limit input field.

2. The display input device of an injection molding machine according to claim 1, wherein,

the setting screen information includes, as the speed limit input field, a reverse speed input field capable of setting the reverse speed limit value and a forward speed input field capable of setting the forward speed limit value at different positions.

3. The display input device of an injection molding machine according to claim 1 or 2, wherein,

the limit speed input field is capable of inputting limit closure information that does not implement a limit of the backward speed or a limit of the forward speed of the injection member.

4. A control device for an injection molding machine provided with an injection member provided in a cylinder for heating a molding material and an injection driving source for filling the molding material in a mold device by advancing the injection member, the control device comprising:

a retraction speed limiting unit configured to limit a retraction speed of the injection member to a preset retraction speed limiting value or less in a pressure maintaining step of controlling the injection driving source so that a filling pressure applied from the injection member to the molding material becomes a predetermined value; and

And a travel speed limiting unit configured to limit a travel speed of the injection member to a preset travel speed limit value or less in the pressure maintaining step.

5. The control device of an injection molding machine according to claim 4, wherein,

the retraction speed limiting unit and the advancement speed limiting unit may set the retraction speed limit or the advancement speed limit of the injection member to be not performed according to a user operation.

6. A control method of an injection molding machine provided with an injection member provided in a cylinder for heating a molding material and an injection driving source for filling the molding material in a mold device by advancing the injection member, the control method comprising:

in the pressure maintaining step of controlling the injection driving source so that the filling pressure applied from the injection member to the molding material becomes a predetermined value,

when the injection member is retracted, the retraction speed of the injection member is limited to a predetermined retraction speed limit value or less, and when the injection member is advanced, the advancement speed of the injection member is limited to a predetermined advancement speed limit value or less.