CN115139475A

CN115139475A - Movable pressure plate

Info

Publication number: CN115139475A
Application number: CN202210336349.7A
Authority: CN
Inventors: 田村惇朗; 森谷知宽; 伊藤阳介
Original assignee: Sumitomo Heavy Industries Ltd
Current assignee: Sumitomo Heavy Industries Ltd
Priority date: 2021-03-31
Filing date: 2022-03-31
Publication date: 2022-10-04
Also published as: JP2022157892A; JP7562467B2

Abstract

The invention provides a movable platen capable of improving workability. The movable platen includes: a platen body; and a pair of leg portions connected to the platen main body and having a slider coupled to a lower surface thereof, one of the leg portions having a positioning portion on the lower surface thereof, the positioning portion projecting downward for positioning in a turning direction of the slider, and the other of the leg portions having a projecting portion on the lower surface thereof, the projecting portion projecting to the same position as the lower surface of the positioning portion.

Description

Movable pressure plate

Technical Field

The present invention relates to a movable platen of a mold clamping apparatus.

Background

An injection molding machine including a mold clamping device that moves a movable platen is known.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001-121593

However, improvement in workability is required at the time of assembly or maintenance of the mold clamping device.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a movable platen with improved workability.

A movable platen according to an embodiment includes: a platen body; and a pair of leg portions connected to the platen main body and having a slider coupled to a lower surface thereof, one of the leg portions having a positioning portion on the lower surface thereof, the positioning portion projecting downward for positioning in a turning direction of the slider, and the other of the leg portions having a projecting portion on the lower surface thereof, the projecting portion projecting to the same position as the lower surface of the positioning portion.

The invention has the following effects:

according to the present invention, a movable platen with improved workability can be provided.

Drawings

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

Fig. 2 is a diagram showing a state in which an injection molding machine according to an embodiment is clamped.

Fig. 3 is a front view of the movable platen.

Fig. 4 is a side view of the movable platen.

Fig. 5 is an enlarged view of one leg portion of the movable platen.

Fig. 6 is an enlarged view of the other leg portion of the movable platen.

Description of the symbols:

1 injection molding machine

11 positioning part

12 bolt support

13 bolt

14 bolt

21 projection

100 mold clamping device

101 guide piece

105 sliding part

106 bolt

120 movable pressure plate

121 die mounting part

121a notch

122 support part

123 wrist pin joint

124A, 124B leg

124A1, 124B1 foot

124A2, 124B2, 1 st leg

124A3, 124B3, 2 nd leg

124A4 stop bolt mounting part

140 connecting rod

S1 lower surface (lower surface of a leg)

S2 side surface

S3 side surface

S4 lower surface (lower surface of the other leg)

S5 side surface

S6 side surface

S11 lower surface (lower surface of positioning part)

S12 lower surface (side of bolt support)

S21 lower surface (lower surface of the protruding part)

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof is omitted.

< injection Molding machine 1>

First, the injection molding machine 1 will be described with reference to fig. 1 and 2. Fig. 1 is a diagram showing a state of an injection molding machine at the end of mold opening according to an embodiment. Fig. 2 is a diagram showing a state of the injection molding machine according to the embodiment at the time of mold clamping. In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are mutually perpendicular directions. The X-axis direction and the Y-axis direction indicate the horizontal direction, and the Z-axis direction indicates the vertical direction. 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 1. The Y-axis direction negative side is referred to as an operation side, and the Y-axis direction positive side is referred to as an operation-side opposite side.

As shown in fig. 1 to 2, the injection molding machine 1 includes: a mold clamping device 100 that opens and closes the mold device 800; an ejection device 200 that ejects the molded product molded in the mold device 800; an injection device 300 for injecting a molding material into the mold device 800; a moving device 400 for moving the injection device 300 forward and backward with respect to the mold device 800; a control device 700 for controlling the components of the injection molding machine 1; and a frame 900 for supporting the components of the injection molding machine 1. The frame 900 includes a mold clamping device frame 910 that supports the mold clamping device 100 and an injection device frame 920 that supports the injection device 300. The mold clamping frame 910 and the injection device frame 920 are respectively provided on the floor 2 via leveling regulators 930. A control device 700 is disposed in the inner space of the injection device frame 920. Hereinafter, each component of the injection molding machine 1 will be described.

(mold clamping) device)

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

The mold clamping device 100 performs mold closing, pressure raising, 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, a horizontal type, and the mold opening/closing direction is a horizontal direction. 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 the mold opening and closing direction.

The fixed platen 110 is fixed to the clamp frame 910. A fixed mold 810 is attached to a surface of the fixed platen 110 facing the movable platen 120.

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

The moving mechanism 102 moves the movable platen 120 forward and backward with respect to the fixed platen 110, thereby closing, raising, closing, releasing, and opening the mold of the mold apparatus 800. The moving mechanism 102 includes a toggle base 130 disposed at an interval from the fixed platen 110, a connecting rod 140 connecting the fixed platen 110 and the toggle base 130, a toggle mechanism 150 moving the movable platen 120 in the mold opening and closing direction with respect to the toggle base 130, a mold clamping motor 160 operating the toggle mechanism 150, a motion converting mechanism 170 converting the rotational motion of the mold clamping motor 160 into a linear motion, and a mold thickness adjusting mechanism 180 adjusting the interval between the fixed platen 110 and the toggle base 130.

The toggle seat 130 is disposed at an interval from the fixed platen 110, and is mounted on the mold clamping frame 910 to be movable in the mold opening and closing direction. In addition, the first and second substrates are, the toggle seat 130 may be disposed to be movable along a guide laid on the mold clamping unit frame 910. The guide of the toggle seat 130 may be common with the guide 101 of the movable platen 120.

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

The connecting rod 140 connects the fixed platen 110 and the toggle seat 130 with a space L therebetween in the mold opening and closing direction. A plurality of (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 tie bar strain detector 141 that detects strain of the tie bar 140 may be provided on at least 1 tie bar 140. The tie-bar 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 mold clamping force and the like.

In the present embodiment, the tie bar strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, and may be of a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like, and the attachment 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 relative to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 includes a cross head 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 cross head 151. Each of the pair of link groups has a1 st link 152 and a2 nd link 153 connected by a pin or the like to be bendable and extendable. The 1 st link 152 is attached to the movable platen 120 by a pin or the like so as to be freely swingable. The 2 nd link 153 is attached to the toggle seat 130 by a pin or the like so as to be freely swingable. The 2 nd link 153 is attached to the crosshead 151 via a3 rd link 154. When the crosshead 151 is advanced and retreated with respect to the toggle base 130, the 1 st link 152 and the 2 nd link 153 are flexed and extended to advance and retreat the movable platen 120 with respect to the toggle base 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 base 130, and operates the toggle mechanism 150. The mold clamping motor 160 advances and retracts the crosshead 151 with respect to the toggle seat 130, thereby flexing and extending the 1 st link 152 and the 2 nd link 153 and advancing and retracting the movable platen 120 with respect to the toggle seat 130. The mold clamping motor 160 is directly coupled to the motion conversion mechanism 170, but may be coupled to the motion conversion mechanism 170 via a belt, a pulley, or the like.

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

The mold clamping apparatus 100 performs a mold closing process, a pressure raising 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 mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing end position at the set movement speed, and the movable platen 120 is advanced so that the movable mold 820 is brought into contact with the fixed mold 810. The position and the moving speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 and the like. The mold clamping motor encoder 161 detects the rotation of the mold clamping 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 travel speed detector for detecting the travel speed of the crosshead 151 are not limited to the clamp motor encoder 161, and conventional detectors can be used. The movable platen position detector for detecting the position of the movable platen 120 and the movable platen movement speed detector for detecting the movement speed of the movable platen 120 are not limited to the clamp motor encoder 161, and a conventional detector may be used.

In the pressure raising step, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing end position to the mold clamping position, thereby generating a mold 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 process, 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 to obtain a molded article.

The number of the 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 provided in a portion of the cavity space 801 and another portion of the cavity space 801 may be filled with a molding material. A molded article in which the insert and the molding material are integrated can be obtained.

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

In the mold opening step, the crosshead 151 is retreated from the mold opening start position to the mold opening end position at a set moving speed by driving the mold closing motor 160, and the movable platen 120 is retreated to separate the movable mold 820 from the fixed mold 810. Then, the ejector 200 ejects the molded product from the movable die 820.

The setting conditions in the mold closing step, the pressure raising step, and the mold clamping step are set collectively 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 mold boosting step are set as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing end position, and the mold clamping position are arranged in this order from the rear side to the front side, and indicate the start point and the end point of a section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position 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 setting conditions in the decompression step and the mold opening step are also 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 as a series of setting conditions. The mold opening start position, the moving 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 a section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position 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.

Instead of the moving speed, position, etc. of the crosshead 151, the moving speed, position, etc. of the movable platen 120 may be set. Further, instead of the position of the crosshead (for example, the mold clamping position) or the position of the movable platen, the mold clamping force may be set.

However, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. Its magnification is also referred to as the toggle magnification. The toggle magnification is changed according to an angle θ formed by the 1 st link 152 and the 2 nd link 153 (hereinafter, also referred to as "link angle θ"). The link angle θ is determined 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 apparatus 800 changes due to, for example, replacement of the mold apparatus 800 or a change in temperature of the mold apparatus 800, mold thickness adjustment is performed so that a predetermined mold clamping force is obtained at the time of mold clamping. In the mold thickness adjustment, for example, the interval L between the fixed platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time when the movable mold 820 contacts the fixed mold 810.

The mold clamping device 100 includes a mold thickness adjusting mechanism 180. The die thickness adjustment mechanism 180 adjusts the interval L between the fixed platen 110 and the toggle seat 130, thereby adjusting the die thickness. 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 the rear end of the connection rod 140; a screw nut 182 held rotatably and non-retractable on the toggle seat 130; 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 link 140. The rotational driving force of the die thickness adjusting motor 183 can 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 in synchronization. Further, the plurality of screw nuts 182 may be rotated individually by changing the transmission path of the rotational driving force transmission portion 185.

The rotational driving force transmission portion 185 is formed of, for example, a gear. At this time, a driven gear is formed on the outer periphery of each screw nut 182, a drive gear is attached to the output shaft of the die thickness adjusting motor 183, and an intermediate gear that meshes with the plurality of driven gears and the drive gear is rotatably held at the center of the toggle seat 130. Instead of the gears, the rotational driving force transmission portion 185 may be formed of a belt, a pulley, or the like.

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 seats 130 with respect to the connecting rods 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seats 130 is adjusted. Further, a plurality of die thickness adjusting mechanisms may be used in combination.

The interval L is detected using the die thickness adjustment motor encoder 184. The mold thickness adjusting motor encoder 184 detects the rotation amount and the rotation direction of the mold thickness adjusting 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 to monitor and control 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 mold thickness adjustment motor encoder 184, and a conventional detector can be used.

The mold clamping device 100 may include a mold temperature controller that controls the temperature of the mold device 800. The die apparatus 800 has a flow path for a temperature adjusting medium therein. The mold temperature adjuster adjusts the temperature of the temperature adjusting medium supplied to the flow path of the mold apparatus 800, thereby adjusting the temperature of the mold apparatus 800.

The mold clamping apparatus 100 of the present embodiment is a horizontal type in which the mold opening and closing direction is the horizontal direction, but may be a vertical type in which the mold opening and closing direction is the vertical direction.

Further, 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 have a linear motor for opening and closing the mold, or may have an electromagnet for clamping the mold.

(Ejection device)

In the description of the ejector 200, similarly to the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 (for example, the positive X-axis direction) when the mold is closed is set to the front, and the moving direction of the movable platen 120 (for example, the negative X-axis direction) when the mold is opened is set to the rear.

The ejector 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120. The ejection device 200 includes: an ejector rod 210 that ejects the molded product from the mold apparatus 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 to be movable forward and backward in the through hole of the movable platen 120. The tip end portion of the ejector rod 210 contacts the ejector plate 826 of the movable mold 820. The tip end portion 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 the rotational motion of the ejector motor into the linear motion of the ejector rod 210. The motion conversion mechanism includes a screw shaft and a screw nut screwed to the screw shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

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

The position and the moving speed of the ejector rod 210 are detected using, for example, an ejector motor encoder. The ejection motor encoder detects the rotation of the ejection motor, and transmits a signal indicating the detection result to the control device 700. The ejector rod position detector for detecting the position of the ejector rod 210 and the ejector rod movement speed detector for detecting 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 explanation of the injection apparatus 300, unlike the explanation of the mold clamping apparatus 100 and the explanation of the ejector apparatus 200, the moving direction of the screw 330 during filling (for example, the X-axis negative direction) is set to the front, and the moving direction of the screw 330 during metering (for example, the X-axis positive direction) is set to the rear.

The injection device 300 is provided on the slide base 301, and the slide base 301 is disposed to be movable forward and backward with respect to the injection device frame 920. The injection device 300 is disposed to be movable forward and backward with respect to the mold device 800. The injection device 300 is in contact with the mold apparatus 800, and fills the cavity space 801 in the mold apparatus 800 with the molding material. The injection device 300 includes, for example: a cylinder 310 for heating the molding material; a nozzle 320 provided at the front end of the cylinder 310; a screw 330 disposed in the cylinder 310 so as to be freely advanced and retracted and freely rotatable; a metering motor 340 that rotates the screw 330; an injection motor 350 that advances and retreats the screw 330; and a load detector 360 that detects 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, resin or the like. The molding material is, for example, formed into a granular shape and supplied to the supply port 311 in a solid state. 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 heater 313 such as a band heater and a 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 in an axial direction (e.g., X-axis direction) of the cylinder 310. Heaters 313 and temperature detectors 314 are provided in the plurality of regions, respectively. The set temperatures are set for the respective regions, and the control device 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and presses the mold apparatus 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the temperature detected by the nozzle 320 becomes the set temperature.

The screw 330 is rotatably and reciprocatingly disposed in the cylinder 310. 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 a liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retreated. When the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and is filled in the mold apparatus 800.

The check ring 331 is attached to the front of the screw 330 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 to the rear of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the check ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and is relatively retracted with respect to the screw 330 to a closed position (see fig. 2) where the flow path of the molding material is blocked. This prevents backward flow of the molding material accumulated in front of the screw 330.

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 with respect to the screw 330 to an open position (see fig. 1) for opening the flow path of the molding material. Thereby, the molding material is conveyed to the front of the screw 330.

The check ring 331 may be of a co-rotating type that rotates together with the screw 330 and a non-co-rotating type that does not rotate together with the screw 330.

The injection device 300 may have a drive source for moving the check ring 331 back and forth between the open position and the closed position with respect to the screw 330.

Metering motor 340 rotates 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 or the like.

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

The load detector 360 detects a load transmitted between the injection motor 350 and the screw 330. The detected load is converted into a pressure by the control device 700. The load detector 360 is disposed in a transmission path of the load between the injection motor 350 and the screw 330, and detects the load applied to 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 to control and monitor a pressure received by the screw 330 from the molding material, a back pressure applied to the screw 330, a pressure acting from the screw 330 on the molding material, and the like.

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 a mold internal 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 apparatus 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 process and the pressure holding process may be collectively referred to as an injection process.

In the metering step, the metering motor 340 is driven to rotate the screw 330 at a predetermined rotation speed, and the molding material is conveyed forward along the spiral groove of the screw 330. With this, the molding material is gradually melted. As the molding material in a liquid state is conveyed to the front of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retreated. The rotational speed of the 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 may be used.

In the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 in order to restrict the screw 330 from rapidly retreating. The back pressure against the screw 330 is detected, for example, using a load detector 360. When the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering step is completed.

The position and the rotation speed of the screw 330 in the metering step are set 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 rotation speed is set. The rotation speed is set for each interval. The number of the rotational speed switching positions may be 1 or plural. The rotation speed switching position may not be set. Further, the back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a predetermined moving speed, and the cavity space 801 in the mold apparatus 800 is filled with the liquid molding material accumulated in front of the screw 330. For example, the position and moving speed of the screw 330 are detected by 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 to the control device 700. When the position of the screw 330 reaches the set position, switching from the filling step to the holding pressure step (so-called V/P switching) is performed. The position where the V/P switching is performed is also referred to as a V/P switching position. The set moving speed of the screw 330 can be changed according to the position, time, and the like of the screw 330.

The position and the moving speed of the screw 330 in the filling process are set as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a movement speed switching position, and a V/P switching position are set. These positions are arranged in order from the rear side to the front side, and indicate the start point and the end point of a section in which the moving speed is set. The moving speed is set for each section. The moving speed switching position 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 moving speed slower than the set moving speed so that the pressure of the screw 330 becomes equal to or lower than the set pressure for the purpose of protecting the mold.

In the filling process, after the position of the screw 330 reaches the V/P switching position, the screw 330 may be stopped at the V/P switching position and then V/P switching may be performed. Immediately before the V/P switching, the screw 330 may be moved forward at a very low speed or moved backward at a very low speed instead of stopping the screw 330. 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 can be used.

In the pressure holding step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the tip end of the screw 330 (hereinafter also referred to as "holding pressure") is held at a set pressure, and the molding material remaining in the cylinder 310 is pushed toward the mold apparatus 800. The molding material in the mold apparatus 800 can be supplemented by an insufficient amount due to cooling shrinkage. 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 holding step. 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 retaining step, the molding material in the cavity space 801 in the mold apparatus 800 is gradually cooled, and at the end of the pressure retaining step, the entrance of the cavity space 801 is closed by the solidified molding material. This state is called gate sealing, and prevents the backflow of the molding material from the cavity space 801. After the pressure holding step, the cooling step is started. In the cooling step, the molding material in the cavity space 801 is solidified. The metering step may be performed in the cooling step for the purpose of shortening the molding cycle time.

The injection device 300 of the present embodiment is of a coaxial screw type, but may be of a screw preplasticizing type or the like. The injection device of the screw preplasticizing 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 disposed to be rotatable and not to advance and retreat, or the screw is disposed to be rotatable and advance and retreat. On the other hand, the plunger is disposed to be movable forward and backward in the injection cylinder.

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

(moving device)

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

The moving device 400 advances and retreats the injection device 300 with respect to the mold device 800. The moving device 400 presses the nozzle 320 against the mold 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 a1 st port 411 and a2 nd port 412. The hydraulic pump 410 is a pump that is rotatable in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420, sucking in hydraulic fluid (for example, oil) from one of the 1 st port 411 and the 2 nd port 412 and discharging the hydraulic fluid from the other port. The hydraulic pump 410 can also suck the hydraulic fluid from the tank and discharge the hydraulic 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 according to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

The hydraulic cylinder 430 includes a cylinder main body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed relative to the injection device 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a1 st chamber and a rear chamber 436 as a2 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 through the 1 st channel 401, and the injection device 300 is pushed forward. The injection device 300 advances 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 hydraulic 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 through 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 thereto. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into linear motion of the injection device 300 may be used.

(control device)

The control device 700 is constituted by a computer, for example, and as shown in fig. 1 to 2, includes a CPU (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 signal to the outside through the output interface 704.

The control device 700 repeatedly performs a metering process, a mold closing process, a pressure raising 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, thereby repeatedly manufacturing a molded product. A series of operations for obtaining a molded product, for example, operations from the start of a metering process to the start of the next metering process, are also referred to as "shot" or "molding cycle". Also, the time required for one shot is also referred to as "molding cycle time" or "cycle time".

The primary molding cycle includes, for example, a metering step, a mold closing step, a pressure raising 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 order in which the respective steps start. The filling step, the pressure holding step, and the cooling step are performed during the mold clamping step. The start of the mold clamping process may be made coincident with the start of the filling process. The end of the decompression process is consistent with the start of the mold opening process.

In addition, a plurality of steps can 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. Also, the filling process may be started in the mold closing process. The ejection process may be started in the mold opening process. When an opening/closing valve for opening/closing the flow path of the nozzle 320 is provided, the mold opening step may be started in the metering step. Even if the mold opening step is started in the metering step, the molding material does not leak from the nozzle 320 as long as the flow path of the nozzle 320 is closed by the opening and closing valve.

The one-shot molding cycle may include steps other than a metering step, a mold closing step, a pressure raising 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.

For example, after the pressure holding step is completed and before the metering step is started, a pre-metering suck-back step of moving the screw 330 back to a preset metering start position may be performed. The pressure of the molding material accumulated 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 moving backward when the metering process is started.

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

Control device 700 is connected to an operation device 750 that receives an input operation by 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, 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 settings of the injection molding machine 1 and the current state of the injection molding machine 1 can be displayed on the screen of the touch panel 770. Further, on the screen of the touch panel 770, for example, an operation unit such as a button or an input field for receiving an input operation by a user can be displayed. The touch panel 770 as the operation device 750 detects an input operation by a user on the 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 1 by operating an operation unit provided on the screen while checking information displayed on the screen. Then, the user can operate the operation unit provided on the screen to operate the injection molding machine 1 corresponding to the operation unit. The operation of the injection molding machine 1 may be, for example, the operation (including the stop) 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 1 may be switching of a screen displayed on the touch panel 770 as the display device 760.

Further, although the case where operation device 750 and display device 760 of the present embodiment are integrated into touch panel 770 has been described, they may be provided separately. 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 fixed platen 110).

< Movable platen >

Next, the movable platen 120 will be described with reference to fig. 3 and 4. Fig. 3 is a front view of the movable platen 120. Fig. 4 is a side view of the movable platen 120. In the following description, the left-right direction of the movable platen 120 as viewed from the front is also referred to as an operation direction and a direction (operation reverse direction) (± Y direction) opposite to the operation direction. The front-back direction of the movable platen 120 when viewed from the front is also referred to as the sliding direction (± X direction). The upward direction of the movable platen 120 when viewed from the front is also referred to as the vertical direction (+ Z direction).

The movable platen 120 includes a mold mounting portion 121, a support portion 122, a wrist pin connecting portion 123, and a pair of

leg portions

124A and 124B. The mold mounting portion 121 and the support portion 122 supported by the pair of

leg portions

124A and 124B are also referred to as a movable platen body.

The die mounting portion 121 has a movable die 820 mounted on a surface thereof. Notches 121a through which the tie bars 140 pass are provided at four corners of the die attachment portion 121.

The support portion 122 is provided at the center of the back surface of the mold mounting portion 121. The support portion 122 has a substantially rectangular cylindrical shape with a rear (X direction) opening. A driving mechanism 220 of the ejector 200 is disposed in the support portion 122.

The wrist pin connecting portion 123 is provided in the support portion 122. The wrist pin connecting portion 123 is connected to the 1 st link 152 via a connecting pin. The mold clamping force from the mold clamping device 100 is transmitted to the center of the back side of the mold mounting portion 121 via the wrist pin connecting portion 123 and the support portion 122.

Leg 124A includes a leg 124A1 to which slider 105 is attached, A1 st leg 124A2 extending perpendicularly from leg 124A1, and A2 nd leg 124A3 connected from 1 st leg 124A2 to the height direction center of support portion 122.

The leg 124A1 is a member having a longitudinal direction in the sliding direction (X direction), and is formed in a shape of a letter "1246767. Further, a slider 105 that moves along the guide 101 is attached to the lower surface side of the leg portion 124A1 on one side in the longitudinal direction (+ X direction) and the other side in the longitudinal direction (-X direction). In addition, leg 124A1 is formed with a through hole (not shown) that penetrates from the upper surface of leg 124A1 to the lower surface (lower surface S1 described later in fig. 5) of leg 124A1, and slider 105 is fixed to leg 124A1 by bolt 106 inserted through the through hole. The leg 124A1 will be described later with reference to fig. 5.

The 1 st leg 124A2 is a member vertically extending from substantially the center in the longitudinal direction of the leg 124A1. The 2 nd leg 124A3 is a member extending obliquely from the upper end of the 1 st leg 124A2 toward the support portion 122. Second leg 124A3 is connected to support portion 122 at a position substantially at the center of support portion 122 in the height direction. In other words, as shown in fig. 3, the 2 nd leg portion 124A3 extends obliquely leftward and downward as viewed from the front surface side of the die attachment portion 121.

Similarly, the leg 124B includes a foot 124B1 to which the slider 105 is attached, a1 st leg 124B2 extending perpendicularly from the foot 124B1, and a2 nd leg 124B3 connected from the 1 st leg 124B2 to the height direction center of the support portion 122.

The leg portion 124B1 is a member having a longitudinal direction in the sliding direction (X direction), and is formed in an L shape with its lower side and right side opened as viewed from the front as shown in fig. 4. Further, a slider 105 that moves along the guide 101 is attached to the lower surface side of the leg 124B1 on one side in the longitudinal direction (+ X direction) and the other side in the longitudinal direction (-X direction). In addition, leg 124B1 is formed with a through hole (not shown) that penetrates from the upper surface of leg 124B1 to the lower surface (lower surface S4 described later in fig. 6) of leg 124B1, and slider 105 is fixed to leg 124B1 by bolt 106 inserted through the through hole. The leg 124B1 will be described later with reference to fig. 6.

The 1 st leg 124B2 is a member vertically extending from substantially the center in the longitudinal direction of the leg 124B1. The 2 nd leg 124B3 is a member extending obliquely from the upper end of the 1 st leg 124B2 toward the support portion 122. Second leg 124B3 is connected to support portion 122 at a position substantially at the center of support portion 122 in the height direction. In other words, as shown in fig. 3, the 2 nd leg portion 124B3 extends obliquely downward and rightward as viewed from the front surface side of the mold attaching portion 121.

Thus, the leg portions 124A1 and 124B1 are disposed outside the connecting rod 140 in the operation direction and the direction opposite to the operation direction. The leg portions 124A1 and 124B1 are disposed outside the platen main body (the die attachment portion 121 and the support portion 122) in the operation direction and the direction opposite to the operation direction.

Further, a stopper bolt mounting portion 124A4 to which a stopper bolt (not shown) for stopping the movement of the movable platen 120 is mounted is provided on one leg portion 124A. By locking the stopper bolt, the movable platen 120 cannot move.

Thus, the die attachment portion 121 and the support portion 122 of the movable platen 120 are supported by the

leg portions

124A and 124B at the center in the height direction. Here, the heat of the mold apparatus 800 is transmitted from the mold mounting portion 121, the support portion 122 provided at the center of the back surface of the mold mounting portion 121, the

leg portions

124A and 124B extending from the center in the height direction of the support portion 122, and the leg portions 124A1 and 124B1 to the mold clamping apparatus frame 910. Thus, compared to the movable platen in which the leg portion is directly connected to the lower portion of the mold attachment portion, the temperature of the mold apparatus 800 attached to the mold attachment portion 121 can be suppressed from becoming asymmetrical with respect to the vertical direction.

Next, the legs 124A1 and 124B1 will be further described with reference to fig. 5 and 6.

Fig. 5 is an enlarged view of one leg portion 124A1 of the movable platen 120. The foot 124A1 has a shape of a letter \1246767openeddownward when viewed from the front.

The lower surface S1 of the leg 124A1 abuts the upper surface of the slider 105. The lower surface S1 in contact with the slider 105 is a machined surface with excellent precision.

On one side of the lower surface S1 of the leg portion 124A1 in the direction opposite to the operation direction (the right side in fig. 5), there is provided a positioning portion 11 projecting downward from the lower surface S1 for positioning the slider 105 fixed to the leg portion 124A1 in the operation direction and the direction opposite to the operation direction. The positioning portion 11 is a member having a sliding direction (X direction) as a longitudinal direction, and is formed below the lower surface S1 of the leg portion 124A1. That is, lower surface S11 of positioning portion 11 is formed below lower surface S1 of leg portion 124A1. Further, a side surface S2 in the operation direction (left side in fig. 5) of the positioning portion 11 is a surface that abuts against the slider 105. When the slider 105 is fixed to the leg 124A1, the side surface of the slider 105 in the direction opposite to the operation direction (the right side in fig. 5) is brought into contact with the side surface S2 of the positioning portion 11, whereby the operation direction of the slider 105 and the direction opposite to the operation direction are positioned. The side surface S2 in contact with the slider 105 is a machined surface with excellent precision.

The leg portion 124A1 has a bolt support portion 12 protruding downward from the lower surface S1 on the operation direction (left side in fig. 5) side of the lower surface S1. The bolt support portion 12 is a member having a sliding direction (X direction) as a longitudinal direction, and is formed below the lower surface S1 of the leg portion 124A1. That is, the lower surface S12 of the bolt support portion 12 is formed below the lower surface S1 of the leg portion 124A1.

Further, the bolt support portion 12 is formed with a bolt hole (not shown) that penetrates from a side surface in the operation direction (left side in fig. 5) to a side surface S3 in the direction opposite to the operation direction (right side in fig. 5). A bolt 13 for pressing the slider 105 against the side surface S2 of the positioning portion 11 is screwed into the bolt hole. Further, the width between the side surface S2 of the positioning portion 11 and the side surface S3 of the bolt support portion 12 is formed to be slightly wider than the width of the slider 105.

By turning the bolt 13, the tip of the bolt 13 protrudes from the side surface S3 in the direction opposite to the operation direction (the right side in fig. 5), and presses the side surface of the slider 105. Thereby, the slider 105 is pressed against the side surface S2 of the positioning portion 11, and the slider 105 is positioned. As shown in fig. 5, when the slider 105 is positioned, a gap is formed between the side surface S3 of the bolt support portion 12 and the slider 105.

Further, a spacer (not shown) for adjustment may be inserted between the positioning portion 11 and the slider 105. The positioning portion 11 is formed with a bolt hole (not shown) that penetrates from a side surface in the direction opposite to the operation direction (right side in fig. 5) to a side surface S2 in the operation direction (left side in fig. 5). In the bolt hole, when a spacer for adjustment is inserted between the positioning portion 11 and the slider 105, a bolt 14 for forming a gap between the side surface S2 of the positioning portion 11 and the slider 105 is screwed.

In a state where the bolt 13 is loosened and the tip of the bolt 13 is separated from the side surface of the slider 105, the bolt 14 is rotated to protrude the tip of the bolt 14 from the side surface S2 in the operation direction (left side in fig. 5) and press the side surface of the slider 105. This allows the slider 105 to be separated from the side surface S2 of the positioning portion 11, and a gap into which a gasket can be inserted can be formed between the side surface S2 of the positioning portion 11 and the slider 105. Then, the tip of the bolt 14 is buried in the side surface S2, the gasket is inserted into the gap, and the slider 105 is pressed against the side surface S2 of the positioning portion 11 by the bolt 13, whereby positioning is performed in a state where the gasket is inserted.

After the positioning in the operation direction and the direction opposite to the operation direction is performed, the slider 105 and the leg 124A1 are fixed by the bolt 106. A through hole (not shown) provided in the leg portion 124A1 and through which the bolt 106 is inserted is formed with a hole having a diameter larger than the axial diameter of the bolt 106 so that positioning adjustment can be performed.

In addition, the lower surface S11 of the positioning portion 11 and the lower surface S12 of the bolt support portion 12 protrude to the same position.

Further, the side surface of the positioning portion 11 in the direction opposite to the operation direction (the right side in fig. 5) protrudes in the direction opposite to the operation direction from the side surface of the leg portion 124A1 in the direction opposite to the operation direction. This increases the thickness of the positioning portion 11 in the operation direction and the direction opposite to the operation direction.

Further, a side surface of the bolt support portion 12 in the operation direction (left side in fig. 5) may protrude in the operation direction from a side surface of the leg portion 124A1 in the operation direction. This can increase the thickness of the bolt support portion 12 in the operation direction and the direction opposite to the operation direction.

Fig. 6 is an enlarged view of the other leg portion 124B1 of the movable platen 120. The leg portion 124B1 has an L shape with the lower side and the right side opened when viewed from the front.

The lower surface S4 of the leg 124B1 abuts the upper surface of the slider 105. The lower surface S4 in contact with the slider 105 is a machined surface with excellent precision.

Leg portion 124B1 has a protruding portion 21 protruding downward from lower surface S4 on the side of the operating direction (left side in fig. 6) of lower surface S4. The protrusion 21 is a member having a sliding direction (X direction) as a longitudinal direction, and is formed below the lower surface S4 of the leg 124B1. That is, lower surface S21 of protruding portion 21 is formed below lower surface S1 of leg 124A1. The lower surface S21 of the protruding portion 21 protrudes downward to the same position as the lower surface S11 of the positioning portion 11 and/or the lower surface S12 of the bolt support portion 12. That is, the lower surface S21 of the protruding portion 21 protrudes to the same position as the lower surface S11 of the positioning portion 11 and/or the lower surface S12 of the bolt support portion 12 (see the broken line in fig. 3).

Further, a side surface of the protruding portion 21 in the direction opposite to the operation direction (the right side in fig. 6) has a step portion between the lower surface S4 of the leg portion 124B1. That is, the side surface of the protruding portion 21 on which the slider 105 is provided has a stepped portion formed by the side surface S5 and the side surface S6. The lower surface S4 in contact with the upper surface of the slider 105 and the side surface S5 continuous to the lower surface S4 form machined surfaces with excellent accuracy. On the other hand, the side surface S6 may be formed in a direction farther from the slider 105 than the side surface S5, and the accuracy may not be improved. By forming the step between the side surface S5 and the side surface S6, the area of the machined surface with good accuracy can be reduced.

The protruding portion 21 is provided on the center side of the movable platen 120 on the lower surface S4 of the leg portion 124B1. That is, the protruding portion 21 protruding from the lower surface S4 of the leg portion 124B1 is provided on the center side of the movable platen 120 with respect to the slider 105 in the operation direction and the direction opposite to the operation direction. This can suppress the width of the movable platen 120.

The slider 105 and the leg 124B1 are positioned on the leg 124A1 side in the operation direction and the direction opposite to the operation direction, and then fixed by the bolt 106. In addition, a through hole (not shown) provided in leg portion 124B1, through which bolt 106 is inserted, is formed with a hole having a diameter larger than the shaft diameter of bolt 106 so that positioning adjustment can be performed. As shown in fig. 6, when the slider 105 is positioned, the side surfaces S5 and S6 of the protruding portion 21 are spaced from the slider 105.

With this configuration, the movable platen 120 can be supported by the lower surface S11 and the lower surface S21 in a grounded state in a state where the movable platen 120 alone is mounted with the slider 105 and the like. This allows the movable platen 120 to be placed and self-supported without using spacers or the like for adjusting the height of the left and

right leg portions

124A, 124B. For example, in the assembly work and the maintenance work of the movable platen 120, the movable platen 120 can be placed on the ground and can be made self-standing, so that the workability can be improved. Further, when additional processing is performed on the movable platen 120, it can be placed on the work table and can be made self-standing, so that workability can be improved.

While the embodiment of the injection molding machine and the like have been described above, the present invention is not limited to the above embodiment and the like, and various modifications and improvements can be made within the scope of the gist of the present invention described in the claims.

The protruding portion 21 may be arranged symmetrically with respect to the center line of the positioning portion 11 and the movable platen 120. This enables the movable platen 120 to stand by itself more stably when mounted.

The protrusion 21 may be provided outside the movable platen 120 from the slider 105 in the operation direction and the direction opposite to the operation direction.

In addition, a plurality of projections 21 may be provided. For example, the movable platen 120 may be provided at positions closer to the center and the outer side than the slider 105 in the operation direction and the direction opposite to the operation direction. In other words, the leg portion 124B1 may have a shape of "\ 12467.

Claims

1. A movable platen includes: a platen body; and a pair of leg parts connected to the platen main body and having a slider connected to a lower surface thereof,

one of the leg portions has a positioning portion on a lower surface thereof, the positioning portion projecting downward for positioning the slider in an operation direction,

the other leg portion has a protruding portion on a lower surface thereof, the protruding portion protruding to the same position as the lower surface of the positioning portion.

2. The movable platen of claim 1,

the protrusion has a space from a slider coupled to the other of the legs.

3. The movable platen according to claim 1 or 2,

the protruding portion and the positioning portion are arranged symmetrically with respect to a center line of the movable platen.

4. The movable platen according to any one of claims 1 to 3,

the protrusion is provided on a center side of the movable platen on a lower surface of the other leg portion.

5. The movable platen according to any one of claims 1 to 4,

the side surface of the protruding portion has a step portion between the side surface and the lower surface of the other leg portion.

6. The movable platen according to any one of claims 1 to 5,

the protruding portion is provided in plurality on the lower surface of the other leg portion.

7. The movable platen of claim 6,

the plurality of protruding portions are provided with the slider coupled to the lower surface of the other leg portion interposed therebetween.

8. The movable platen according to any one of claims 1 to 7,

the leg portion is connected to a side surface of the pressing plate main body.

9. The movable platen according to any one of claims 1 to 8,

the leg part is provided with a foot part for connecting the sliding part,

the leg portion is disposed on an outer side of the platen main body in an operation direction.