[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2008050659A1 - Machine à coulée sous pression et procédé de coulage sous pression - Google Patents

Machine à coulée sous pression et procédé de coulage sous pression Download PDF

Info

Publication number
WO2008050659A1
WO2008050659A1 PCT/JP2007/070296 JP2007070296W WO2008050659A1 WO 2008050659 A1 WO2008050659 A1 WO 2008050659A1 JP 2007070296 W JP2007070296 W JP 2007070296W WO 2008050659 A1 WO2008050659 A1 WO 2008050659A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection
piston
speed
pressure
injection cylinder
Prior art date
Application number
PCT/JP2007/070296
Other languages
English (en)
Japanese (ja)
Inventor
Masashi Uchida
Kazuki Hiraizumi
Yoshinori Okazaki
Original Assignee
Ube Machinery Corporation, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2006290165A external-priority patent/JP4997921B2/ja
Priority claimed from JP2007229335A external-priority patent/JP2009061458A/ja
Application filed by Ube Machinery Corporation, Ltd. filed Critical Ube Machinery Corporation, Ltd.
Priority to US12/447,000 priority Critical patent/US20100000699A1/en
Publication of WO2008050659A1 publication Critical patent/WO2008050659A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

Definitions

  • the present invention relates to a Japanese patent application dated 2 0 0 6 — 2 9 0 1 6 5, 2 0 0 6 — 2 9 0 1 6 5, 2 0 0 7 — 2 dated 4 September 2007 Claims based on the priority of 2 9 3 3 5, the contents of which are incorporated herein by reference and continue in this application.
  • Technical field dated 2 0 0 6 — 2 9 0 1 6 5, 2 0 0 6 — 2 9 0 1 6 5, 2 0 0 7 — 2 dated 4 September 2007
  • the present invention relates to a die casting machine (forging machine) and a die casting method, and more particularly to a metal die casting machine and a die casting method for high-speed injection.
  • Die-casting methods and die-casting machines (forging machines) that use light metal materials such as aluminum are widely used in various fields such as the automobile industry and mold manufacturing.
  • a metal melt supplied from a pouring port into a plunger sleeve is pumped by a plunger tip and filled into a mold cavity (cavity), thereby obtaining a product of a predetermined shape.
  • Forge Since light metals such as aluminum alloys have a shorter solidification time than synthetic resins, it is important to increase the injection speed. In addition, from the viewpoint of productivity, there is a demand for higher emission speed.
  • Fig. 1 shows a schematic diagram of a general die-casting machine 100 for light metals such as aluminum.
  • the die casting machine for light metal is normally hydraulic, supplying hydraulic oil to the head side of the injection cylinder, driving the piston load 4 and planning via the plunger one rod 2
  • the aluminum (AL) molten metal 15 stored in the jar sleep 7 is pushed with the plunger tip 1 and injected into the cavity (cavity) 12 in the molds 8 and 9 to be molded.
  • the gas in the mold is removed by high vacuum (about 5 kPa) to eliminate the gas entrapment nest, increase the injection speed, shorten the filling time, It has been reported that by reducing the amount of shrinkage generated, the mechanical properties of forged products at Dick's are significantly improved.
  • the injection speed is 5 to 7 01 sec, which is about -2.5 times that of the usual 2-3 m Z s 60.
  • the first methods of reducing the surge pressure are (1) reducing the weight of the moving body, and (2) reducing the speed before filling is completed. This method has already been implemented, but the following two methods are used to reduce the speed before filling (2).
  • the most commonly used method is (2-1) The method that hydraulically brakes the plunger tip 1 (ie, piston rod 4) when an injection stroke is detected and it reaches the intended position.
  • the amount of molten aluminum (AL) supplied into the plunger sleeper 7 is black (generally, the amount of molten metal supplied to the plunger sleeve 7 is stored to some extent due to the accuracy of the supply mechanism.
  • the variation of the injection speed of the molten metal into the mold varies, which causes quality defects such as the hot water boundary and the occurrence of molten metal in the mold, and products that are severe to such defects. Then it becomes a big problem. That is, when the stroke is detected by detecting the injection stroke (that is, the position of the plunger tip 1), if the amount of the molten metal in the sleeve 7 is large, the molten metal pressure rises quickly and before the brake is activated. Surge pressure is generated early (the brake timing is relatively slow), resulting in molten metal leakage and burrs.
  • the other method is (2-2) Lowering the injection cylinder capacity during high-speed filling, and naturally decelerating in response to the increase in mold hot water flow resistance that occurs during filling. In this case, the influence of the variation in the amount of hot water is eliminated, and quality defects such as the hot water and hot water generation of the fabricated product in the method (2-1) described above do not occur. However, the following problems occur. If the power at high speed is reduced, the fast rise time will be extended, so the high speed will not be achieved.
  • Figure 14 An example is shown in Figure 14 by dotted lines.
  • Figure 15 shows an overview of the equipment used in the test to obtain the graph of Figure 14.
  • This apparatus is provided with a mold 10 1 and an injection cylinder 10 2 similar to those shown in FIG. 1, and, as in FIG. 2, a piston ACC (accumulator), a gas bottle and a second It has the same valve 31 as 7 pulp.
  • the accumulator overnight (ACC) pressure is reduced from 14 MPa (normal pressure) to 9 MPa.
  • 14 MPa solid line
  • the fast rise time increased from 0.2 to 3.2 mZ sec.
  • the force was 15 msec.
  • 9 MPa (dotted line) 2 It extends by 2 msec and 7 msec.
  • Fig. 26 illustrates the mechanism of the occurrence of defects when the amount of hot water supply is insufficient and deceleration is too fast.
  • it is extremely difficult to improve the accuracy of hot water supply in a water heater, and it is difficult to find a solution.
  • the graph in Fig. 25 shows how the plunger tip position changes when filling is completed, depending on the amount of molten metal.
  • the completion position when the amount of molten metal is appropriate (as planned) is shown as the “ideal completion position” (dashed line).
  • the filling completion position is away from the gate 6 and is therefore the position indicated by the one-dot chain line.
  • the filling completion position approaches the gate 6 and is the position indicated by the two-dot chain line.
  • a surge pressure is generated and the hot water tip flies.
  • it is difficult to increase the accuracy of hot water supply in a water heater and it is not easy to grasp the amount of hot water, so it is difficult to grasp the amount of hot water and adjust the deceleration start position.
  • Patent Document 2 a proposal for reducing the weight of a moving body has been made (for example, see Patent Document 2), but this does not disclose the proposal of the present invention.
  • Patent Document 1 Another proposal has been made (see Patent Document 1).
  • this proposal as described above, when there is variation in the amount of molten metal stored in the plunger sleeve, the injection lock Since an error occurs in the deceleration start position of the door, the generation of surge pressure and quality defects cannot be suppressed.
  • Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 1 — 3 0 0 7 1 4
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2 0 0 4 — 2 1 6 4 3 2 Disclosure of Invention
  • the present invention has been made in view of the above-described circumstances.
  • the generation of a surge pressure is reduced by reducing the generation of surge pressure, or by sprinkling of a hot water tip or the tip of a hot water tip.
  • the purpose is to minimize the variation in on-site forging quality.
  • a die casting machine injects molten metal (15) into a mold (1101) for forging a product and mold (1001). And a hydraulic device (1 0 3, 2 0 3) for pressing the injection cylinder (1 0 2) at a high pressure.
  • the hydraulic device (1 0 3, 2 0 3) supplies hydraulic oil that presses the piston (1 3) of the injection cylinder (1 0 2) to the injection cylinder.
  • the screw accumulator (ACC) (2 0) is equipped with a high-pressure, high-speed startup piston accumulator (ACC-B) (2 2, 3 2 2) and a low-pressure injection piston accumulator (ACC- A). (2 1, 3 2 1).
  • the piston of the injection cylinder is started at a high pressure and switched to a low pressure drive at a predetermined stroke of the piston. For example, even if there is a variation in the amount of molten metal in the mold plunger sleeve, the generation of surge pressure in the mold cavity is reduced to prevent burrs and hot water spraying. The variation in the quality of the forged products on site can be minimized.
  • the piston (1 3) of the injection cylinder (1 0 2) is first a high-speed startup piston accumulator (AC C- B). ) (2 2, 3 2 2) Pressed by the high hydraulic fluid pressure supplied by (2 2, 3 2 2), operates at a high injection speed, and then the high-speed startup piston accumulator (ACC— B) The hydraulic oil pressure supplied by 2) is cut off and pressed by the low-pressure hydraulic pressure supplied by the piston accumulator for injection (AC C—A) (2 1, 3 2 1).
  • the generation of surge pressure can be reduced by switching to a low pressure at an appropriate timing instead of continuing to press the piston of the injection cylinder at a high pressure.
  • the piston accumulator for high speed startup (ACC-B) (2 2 ACC-B, which separates and forms a gas chamber (2 2 7) and a hydraulic oil chamber (2 2 8) therein, and reciprocates in the high-speed startup piston accumulator (ACC-B).
  • the piston (2 2 1) and the ACC— B piston (2 2 1) are fixed to the hydraulic oil chamber side and extended to the hydraulic oil chamber of the high-speed startup piston accumulator (ACC— B). And a protrusion (2 2 2) extending through the side end wall (2 2 6).
  • the piston accumulator for injection (ACC—A) (2 1) has a gas chamber (2 1 7) and a hydraulic oil chamber (2 1 8) separated and formed therein, and the piston accumulator for injection (AC C — ACC that reciprocates within A) — A Piston (2 1 1).
  • the protrusion (2 2 2) passes through the gas chamber side end wall (2 1 6) of the injection piston accumulator (AC C— A) (2 1), and the injection piston accumulator (ACC— A) ( 2 1) can enter the gas chamber (2 1 7), detachably contact the ACC-A piston (2 1 1) and press it.
  • the use of the piston accumulator (AC C) having a special structure as described above allows the discontinuity of speed at the time of high-speed start-up caused by opening and closing of large valves and check valves. Since it can avoid continuity and ensure continuity, higher quality forged products can be produced.
  • the piston accumulator (A C C) with a special structure can be installed in a compact space, so it can be cost effective.
  • the piston accumulator for high-speed startup (ACC-B) (2 2) and the piston accumulator for injection (AC C-A) (2 1) are integrally formed. According to this embodiment, it is possible to provide a configuration capable of smoothly switching from a high-speed startup piston accumulator (ACC-B) to an injection piston accumulator (ACC-A), and to provide a high-speed startup piston accumulator.
  • a piston accumulator (ACC) consisting of an accumulator and an injection piston accumulator can be compactly formed.
  • the molten metal in the mold is allowed to flow for a predetermined time and A pressurization accumulator (2 3) for maintaining pressure at a predetermined pressure is further provided.
  • the configuration of the hydraulic device that can ensure good product quality is further clarified.
  • the injection cylinder inlet valve (3 1) is made up of the piston cumule overnight (ACC) (20).
  • ACC piston cumule overnight
  • the configuration that can control the injection speed well is clarified.
  • a stroke sensor for detecting a stroke mouth of the piston (1 3) of the injection cylinder (1 0 2) (46) is further provided.
  • the configuration in which the stroke of the piston of the injection cylinder is detected by the stroke sensor is further clarified.
  • the injection of the molten metal (15) is controlled by the stroke sensor (46).
  • the piston stroke of the injection cylinder is detected by the stroke sensor, and control such as high pressure Z low pressure switching of the drive (pressing pressure) pressure to the injection cylinder can be performed.
  • the hydraulic device further includes a pump.
  • Pump Hydraulic oil can be supplied to the discharge cylinder (1 0 2) and the piston accumulator (ACC) (2 0).
  • the configuration of the hydraulic device for the die casting machine of the present invention is further clarified.
  • the initial state of the high-speed startup piston accumulator (ACC-B) (2 2, 3 2 2) The initial pressure of the injection accumulator (AC C— A) (2 1, 3 2 1) is set to 5 to 12 MPa.
  • the configuration of the driving (pressing) control of the injection cylinder is further clarified.
  • the die casting machine (100) used in the die casting method according to the first aspect of the present invention includes a die (1 0 1) for forging a product and a die (1 0 1).
  • An injection cylinder (1 0 2) for injecting the molten metal (1 5) and an oil pressure device (1 0 3, 2 0 3) for pressing the injection cylinder (1 0 2) at a high pressure are provided.
  • the hydraulic device (1 0 3, 2 0 3) is a piston accumulator (ACC) that supplies hydraulic oil that presses the piston (1 3) of the injection cylinder (1 0 2) to the injection cylinder (1 0 2).
  • Piston accumulator (ACC) (20) has two types of piston accumulators (ACC—B) (2 2, 3 2 2) for high-speed, high-speed startup, and piston accumulators (AC) for low-pressure injection (AC).
  • the die casting method using such a die casting machine uses an injection cylinder from a piston accumulator (2 2, 3 2 2) for high-speed startup. Supply high pressure hydraulic oil to the cylinder (1 0 2), press the piston (1 3) of the injection cylinder (1 0 2), and inject the molten metal. Shut off the hydraulic fluid from the accumulator (2 2, 3 2 2) to the injection cylinder (1 0 2) and reduce the pressure from the piston accumulator for injection (2 1, 3 1) to the injection cylinder (1 0 2). It is characterized by comprising a low-pressure injection procedure for supplying hydraulic oil, pressing the piston (1 3) of the injection cylinder (10 2), and continuing the injection of the molten metal.
  • the piston of the injection cylinder is started at high pressure and switched to low pressure drive at a predetermined piston stroke. Even if there is variation in the amount of molten metal in the plunger sleep, the generation of surge pressure in the molten metal mold mold can be reduced to prevent burrs and hot water spraying. Can be minimized.
  • the hydraulic device (1 0 3, 2 0 3) is configured to supply the molten metal in the mold (1 0 1) for a predetermined time.
  • a boosting accumulator (2 3) for pressurizing and holding at a predetermined pressure is further provided. After the injection of molten metal by the high-speed startup piston accumulator (2 2, 3 2 2) and the injection piston accumulator (2 1, 3 2 1) is completed, the boost accumulator (2 3) The method further includes a step of pressurizing the molten metal continuously.
  • the pressure of the accumulator is continuously used to pressurize the molten metal, thereby further clarifying the configuration of the method that can ensure the good quality of the product.
  • the hydraulic device (1 0 3, 2 0 3) further includes a pump. Before the high-pressure injection procedure and low-pressure injection procedure, hydraulic oil is supplied from the pump to the injection cylinder (1 0 2) to advance the piston (1 3) of the injection cylinder (1 0 2). Is further provided.
  • the procedure for advancing the piston of the injection cylinder to a predetermined position is made clearer before the start of injection molding.
  • the hydraulic device (1 0 3, 2 0 3) is an injection cylinder (1 0 2)
  • the high-pressure injection procedure and the low-pressure injection procedure are started based on the piston (1 3) stroke detected by the stroke sensor (4 6).
  • the start and end of high-pressure injection (high-speed piston drive) (ie, low-pressure injection) Clarify the control configuration in which (start) is implemented.
  • the die casting machine comprises a mold (10 1) for forging and molding a product; and a piston (1 3) which is provided in itself to move the mold (1 0 1).
  • a mold (10 1) for forging and molding a product Is an injection cylinder (1 0 2) for injecting molten metal (1 5), and when hydraulic fluid is supplied to it, piston (1 3) is transferred to the mold (1 0 1).
  • An injection cylinder (1 0 2) comprising a rod chamber (1 6 R); a hydraulic device for supplying hydraulic oil to the injection cylinder (1 0 2)
  • the hydraulic device (3 0 3) is an injection that supplies hydraulic oil that presses the piston (1 3) of the injection cylinder (1 0 2) to the injection cylinder (1 0 2).
  • Pi A stone accumulator (2 0) having a hydraulic oil chamber (2 1 8) for containing hydraulic oil and a gas chamber (2 1 7) for containing gas, and a hydraulic oil chamber (2 1 8),
  • the injection piston accumulator (20) is separated from the gas chamber (2 17) in a fluid-tight manner; from the injection piston accumulator (20) to the head of the injection cylinder (102).
  • the die casting machine there are three gas bottles, and the ratio of the contents of the three gas bottles is preferably 1: 2: 4.
  • the die casting machine according to the first aspect of the present invention is The injection mold for injecting the molten metal (15) into the mold (101) by moving the die (110), which is forged molding, and the piston (13), which is provided in itself.
  • the piston (1 3) When the hydraulic fluid is supplied to it, the piston (1 3) is moved forward toward the mold (1 0 1), and the head chamber (1 6 H , And when the hydraulic oil is supplied thereto, the piston (1 3) is moved back away from the mold (1 0 1), and the injection chamber is provided with a rod chamber (1 6 R). (1 0 2);; Hydraulic device for supplying hydraulic oil to the injection cylinder (1 0 2)
  • the hydraulic device (4 0 3) is an injection piston accumulator (2 0) that supplies hydraulic oil that presses the piston (1 3) of the injection cylinder (1 0 2) to the injection cylinder (1 0 2).
  • the opening of the filling force pattern adjustment valve (8 2) can be set in a variable manner. By adjusting the opening of the filling force pattern adjustment valve (8 2), the opening to the injection cylinder (1 0 2) can be adjusted. The filling power of hydraulic oil can be adjusted.
  • the die casting machine further includes an automatic control device.
  • the automatic controller is equipped with an arithmetic circuit for selecting the filling force pattern using the high-speed injection stroke and high-speed injection speed of the injection cylinder (1 0 2) as a parameter.
  • the opening degree of the filling force pattern adjustment valve (8 2) is adjusted so as to match the filled filling force pattern.
  • the hydraulic devices (30 3, 4 0 3) are in fluid communication with the head chamber (16H) of the injection cylinder (10 2) and after the molten metal is injected and filled, the molten metal in the mold is removed.
  • An accumulator for pressure increase (2 3) for increasing the pressure and holding the pressure at a predetermined pressure for a predetermined time, and between the pressure increase accumulator (2 3) and the injection cylinder (1 0 2)
  • the boosting on-off valve (3 5) that opens and shuts off the flow of hydraulic oil from the boosting accumulator (2 3) to the injection cylinder (10 2), and the boosting accumulator (2 3) and injection cylinder (1 0 2), the pressure increasing time of the injected molten metal is adjusted by changing the opening of the pressure increasing / closing valve (3 5) in series with the pressure increasing / closing valve.
  • the die casting forging method using the die casting machine of the 15th form consists of a low-speed injection stage in which the molten metal (15) in the injection cylinder (10 2) is pressed at a low speed, and the injection cylinder (10 02) A high-speed injection stage in which the molten metal (15) is pressed at a high speed and injected into the mold (101).
  • the gas bottle to be used according to the injection filling force is selected from a plurality of gas bottles (7 1, 7 2, 7 3), and the gas valve switching valve selected in the selection procedure is opened And a procedure.
  • the die casting method using the die casting machine of the 16th form consists of a low-speed injection stage in which the molten metal (15) in the injection cylinder (100) is pressed at a low speed, and the injection cylinder (102) A high-speed injection stage in which the molten metal (15) is pressed at a high speed and injected into the mold (101).
  • the high-speed injection stage includes an opening degree setting procedure for setting the opening degree of the filling force pattern adjustment valve (8 2) according to the high injection speed and the injection filling force.
  • the pressure drop of the working oil in the accumulator due to gas expansion by appropriately selecting a combination of multiple gas bottles Without complicated control, it is possible to start up high speed in a short time and high speed in a short time.
  • the high speed value is lowered by natural deceleration due to flow resistance, the pressure is lowered to the optimum value before filling is completed, the impact value at the time of filling is reduced, and high-speed injection molding is enabled. Suppresses the occurrence of surge pressure of molten aluminum in mold cavities, and prevents burrs, hot water jets, or splashes of the hot water.
  • the plunger will naturally decelerate before the filling completion position due to the flow resistance of the molten metal that has flowed into the mold, so the deceleration position in the mold is the same. This suppresses the generation of surge pressure and prevents the occurrence of burrs, spraying of hot water, or jumping of hot water.
  • FIG. 1 is a schematic explanatory view of a die casting machine (manufacturing apparatus) according to a first embodiment of the present invention, and shows a configuration in the vicinity of a die 10 1 and an injection cylinder 1 0 2 of the die casting machine. .
  • FIG. 2 is a system diagram of the hydraulic apparatus 10 3 of the die-cast machine 100 according to the first embodiment of the present invention.
  • FIG. 3 is a system diagram for explaining various operating states (outline) of the die-cast machine 100 in FIG. 1, showing the flow of hydraulic oil during low-speed operation of the piston of the injection cylinder.
  • FIG. 4 is a system diagram illustrating various operating states (outline) of the die casting machine 100 of FIG. 1, and shows the flow of hydraulic oil during high-speed start-up operation of the piston of the injection cylinder.
  • FIG. 5 is a system diagram illustrating various operating states (outline) of the die cast machine 100 of FIG. 1, and shows the flow of hydraulic oil during the injection operation.
  • FIG. 6 is a system diagram for explaining various operating states (outline) of the die-cast machine 100 in FIG. 1, and shows the flow of hydraulic oil during pressure-increasing operation.
  • FIG. 7 is a system diagram for explaining various operating states (outline) of the die-cast machine 100 in FIG. 1, and shows the flow of hydraulic oil during the charging operation of the injection piston A C C-A.
  • Fig. 8 is a system diagram for explaining the various operating states (outline) of the die casting machine 100 in Fig. 1.
  • the flow of hydraulic oil during charge operation of the high-speed start-up piston ACC-B is shown in Fig. 8. Show.
  • FIG. 9 is a system diagram for explaining various operating states (outline) of the die-cast machine 100 in FIG. 1, showing the flow of hydraulic oil during reverse operation of the piston of the injection cylinder.
  • FIG. 10 is a system diagram of a hydraulic device 20 3 for a die casting machine according to a second embodiment of the present invention, and corresponds to FIG.
  • FIG. 11 is a schematic cross-sectional explanatory view of a special piston accumulator (A C C) used in the die casting machine according to the first embodiment of the present invention.
  • Fig. 12 is an injection speed and metal pressure diagram in the conventional high-speed forging method.
  • the horizontal axis is the square and the time axis.
  • FIG. 13 is an injection speed and metal pressure diagram in the high-speed forging method according to the present invention, and the horizontal axis is the stoichiometric and time axis.
  • Figure 14 shows a high-speed output over injection (high-pressure accumulator pressure
  • FIG. 16 is a system diagram of a hydraulic apparatus for a die casting machine according to a third embodiment of the present invention.
  • Fig. 17 is a table showing the total gas amount by the combination when three types of gas bottles are used.
  • Fig. 18 shows an example of a die casting machine of the 800-ton class, with eight types of total gas capacities for the head chamber during high-speed injection during empty blow (injection without molten metal). This is a graph showing the pressure drop (the pressure drop for the high-speed injection stroke is shown).
  • FIG. 19 is a system diagram of a hydraulic apparatus for a die casting machine according to the fourth embodiment of the present invention.
  • Fig. 20 shows an explanatory diagram of changing the filling force pattern by changing the opening of the filling force pattern adjustment valve.
  • the high speed injection speed is 2 (m / sec)
  • the pressure in the head chamber (PH) (MPa) over time (this graph is called the filling force pattern).
  • Fig. 21 shows an explanatory diagram of changing the filling force pattern by changing the opening of the filling force pattern adjustment valve.
  • the high-speed injection speed is 5 (m / sec)
  • the pressure in the head chamber (PH) (MPa) over time.
  • Figure 22 shows an explanatory diagram of changing the filling force pattern by changing the opening of the filling force pattern adjusting valve.
  • the high-speed injection speed is 8 (m / sec)
  • the pressure in the head chamber (PH) (MPa) over time.
  • Fig. 2 3 A shows the time variation of the injection speed and injection pressure (pressure of the injection cylinder 10 2 2, 16 H, etc.) and the piston rod at that time in the third embodiment. It is a chart which shows states, such as a valve, and shows the upper part.
  • Fig. 23B shows the time variation of the injection speed and injection pressure (pressure of the injection cylinder 10 2 2 16 H), etc., and the piston rod and valves at that time in the third embodiment. It is a chime that shows the state of The lower part is shown.
  • FIG. 24 A shows the time variation of the injection speed and injection pressure (pressure of the head chamber 16 H of the injection cylinder 10 2) in the fourth embodiment, and the piston rod, each valve, etc.
  • FIG. 2 is a chart showing the state of FIG. 2 and shows the upper part thereof, which is the same drawing as FIG.
  • Fig. 2 4B shows the time variation of the injection speed and injection pressure (pressure in the head chamber 16 H of the injection cylinder 10 2), etc., and the piston rod at that time in the fourth embodiment. It is a chart showing the state of the valve and the like, showing the lower part thereof, and is the same drawing as FIG.
  • Fig. 25 is an explanatory diagram of the injection speed of injection molding at an ultra-high injection speed and shows the positional relationship at the end of injection with respect to the amount of hot water.
  • Fig. 26 is an explanatory diagram illustrating the mechanism of failure occurrence when the amount of hot water supply is insufficient and deceleration is completed before filling is completed. DESCRIPTION OF PREFERRED EMBODIMENTS FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a schematic explanatory view of a portion near a die 10 1 and an injection cylinder 1 0 2 of a general die-casting machine 10 1 for light metals such as aluminum, and the present invention.
  • the die casting machine 100 has a similar mold 10 1 and injection cylinder 10 2.
  • FIG. 2 is a system diagram of the first embodiment of the die cast machine 100 according to the present invention.
  • FIGS. 3 to 9 illustrate various operating states (outline) of the die cast machine 100 of FIG.
  • FIG. 11 is a schematic cross-sectional explanatory view of a special piston accumulator (A C C) 20 used in the die casting machine 100 according to the first embodiment of the present invention.
  • a C C special piston accumulator
  • FIG. 1 the die casting machine (forging apparatus) of the present invention.
  • a 100 0 mold 1 0 1 and an injection cylinder 1 0 2 are shown schematically.
  • Figure 1 has already been explained in the description of the prior art, but here it will be explained in more detail.
  • the die-casting machine 100 in FIG. 1 normally produces light metal products such as aluminum. Die casting machine (forging equipment)
  • 1 0 0 includes a mold 1 0 1 and an injection cylinder 1 0 2.
  • the mold 1 0 a space between a pair of opposed fixed platens 1 0 and a movable platen 1 1 is provided.
  • the fixed mold 8 and the movable mold 9 are provided in the fixed mold 8 and the movable mold 9 are engaged with each other as shown in Fig. 1 to form a cavity 12 between them. Molded products are manufactured by injection and filling molten metal 15 into the cavity 1 2.
  • An injection cylinder 1 0 2 is provided for injecting molten aluminum 1 5, and a plunger sleeve 7 is provided on the stationary platen 1 ⁇ in which a molten aluminum 1 5 is stored. , Pass through the fixed platen 10 and fixed mold 8 and fluidly contact the capacities 12.
  • the injection cylinder 102 is a hydraulically driven reciprocating piston / cylinder for ejecting molten aluminum.
  • the injection cylinder 10 0 2 includes a cylinder 6 and a piston 1 3.
  • the piston 13 is engaged with the plunger sleeve 7 as shown in FIG.
  • Piston 13 has a piston head 5 at the left end in FIG. 1, and piston rod 2 is connected to piston rod 4 integrated with the piston head 5 with a piston ring 3.
  • a plunger tip 1 is attached to the end.
  • Plunger chip 1 fits into plunger sleeve 7 and reciprocates in plunger sleeve 7 to pump molten aluminum 15 in plunger sleeve 7 to provide molten aluminum 1 5 The injection filling.
  • the injection cylinder 1 0 2 is a hydraulic type
  • the hydraulic oil is Supply to the head side of W da 6 and drive the piston head 5 and piston rod 4, and press the aluminum (AL) molten metal 15 stored in the plunger sleeve 7 with the plunger tip 1 and fix it.
  • the cavities (cavities) 12 in the molds 8 and 9 are injection-filled into the mold and forged.
  • FIG. 2 schematically shows a hydraulic circuit of the hydraulic device 103 according to the first embodiment of the present invention for driving the injection cylinder 102.
  • the cylinder 6 head chamber 1 6 H inlet line is equipped with a seventh valve 3 1 that controls the injection speed and a piston ACC (accumulator) 2 0 that can discharge a large flow rate for high speed injection.
  • this piston ACC (accumulation overnight) 20 is also characterized by having a suitable configuration.
  • Piston ACC 20 is divided into two parts, upper and lower, and piston ACC (accumulator) 1 B 2 2 2 in the upper part of piston 2 2 1 is the protrusion 2 2 2 of the rod part This projection 2 2 2 presses the upper surface of the lower injection piston AC C (accumulator) — the piston 2 1 1 of A 2 1.
  • High-speed startup piston ACC— B 2 2 in the upper part stores high-pressure gas (for example, 14 MPa) that is detected and managed by the pressure sensor P b 4 4.
  • the low pressure gas eg, 6 MPa
  • the Vista ACC—A 2 1 is stored in the Vista ACC—A 2 1.
  • the accumulator pressure (especially the initial pressure) of the high-pressure gas in the high-speed startup piston AC C— B 2 2 is in the range of 14 to 21 MPa.
  • the accumulated pressure (particularly the initial pressure) of the low-pressure gas in A 21 is set in the range of 5 to 12 MPa.
  • the first valve 24 is installed between the pump pressure supply port and the injection cylinder 10 2, and is used for the injection low speed advance.
  • 1 6 H is provided for the purpose of introducing pressure oil from a pump (not shown).
  • the second valve 25 is installed between the tank 40 and the injection cylinder 10 0 2 for the purpose of returning the working oil in the head chamber 16H of the cylinder 6 to the tank 40 for injection backward movement. Is provided.
  • the third valve 26 is installed between the pump pressure supply port and the injection cylinder 10 2, and introduces pressure oil from the pump (not shown) into the rod chamber 16 R of the cylinder 6 for injection and retraction. It is provided for the purpose.
  • the 4th valve 27 is installed between the tank 40 and the injection cylinder 10 2 to return the hydraulic oil in the cylinder chamber 16 of the cylinder 6 to the tank 40 for the advance of injection. Is provided.
  • the fifth valve 28 is installed on the hydraulic oil outlet side of the high-speed start-up piston ACC—B 22 and starts to lower the high-speed start-up piston ACC—B 22 at the high speed. It is set for the purpose of stopping at.
  • the sixth valve 29 is installed between the piston ACC 20 and the injection cylinder 10 2, and the ACC (accumulator) 1 (A and B) 2 1, 2 2 pressure oil is applied to the cylinder 6 at high speed. It is provided for the purpose of introducing it.
  • the seventh valve 3 1 is installed between the sixth valve 29 and the injection cylinder 10 2 for the purpose of controlling the injection speed.
  • the eighth valve 32 is provided for the purpose of supplying pressure oil from the pump to the piston AC C20.
  • the ninth valve 33 is provided for the purpose of compressing the gas in the gas bottle a41 to the target pressure.
  • the 10th valve 3 4 is provided for the purpose of compressing the gas in the gas bottle b 4 2 to the target pressure.
  • the 8th to 10th valves 3 2, 3 3 and 3 4 are respectively installed between the pump supply port and the piston AC C 2 0, the gas bottle a 4 1 and the gas bottle b 4 2.
  • the purpose of the first valve 35 is to supply hydraulic oil at a preset pressure into the cylinder head chamber 16H of the cylinder 6 by the hydraulic pressure from the ACC (accumulation overnight) 23 Thus, it is provided between the AC C (accumulator) 2 3 for boosting and the injection cylinder 1 0 2.
  • a variable speed controller 36 is provided on the outlet side (injection cylinder side) of the 1st 1 valve 3 6 to pressurize (increase) the manufactured product at a constant pressure and the hydraulic oil flow (pressurization) It is preferable that the speed can be adjusted.
  • the seventh valve 31 is preferably driven by a motor, but may be another type such as a hydraulic drive or a pneumatic drive.
  • the first to first 1 valves other than the seventh valve 31 are preferably solenoid valves, but may be other types of valves.
  • Figure 2 shows a preferred hydraulic circuit.
  • the 8th valve 3 2 (conducting state, that is, supply pump pressure) and push the upper and lower ACC 2 1 and 2 2 pistons to the upper limit.
  • the gas in 1 is pressurized to the target pressure (for example, 6 MPa) by turning ON the 9th valve 3 3 (conducting state, that is, supplying pump pressure).
  • the target pressure in the gas bottle a 41 is 5 to 12 MPa and the target pressure in the gas bottle b 42 is 14 to 2 IMPa.
  • FIG. 3 the operation of the device during low-speed travel of the piston 13 will be described with the flow of hydraulic oil.
  • Pressure oil from the pump (not shown) is introduced from the first valve 24 to the cylinder head chamber 16 H of the cylinder 6 at a flow rate limited by the speed control seventh pulp 31.
  • the cylinder rod chamber 1 6 The hydraulic fluid of R is returned from the fourth pulp 27 to the tank 40, and the piston port 4, plunger 1 rod 2, and plunger tip 1 (piston 1 3) move forward at low speed (Fig. 1 3 is the state between T 0 and T 1).
  • the upper high-speed start-up piston ACC—B 2 2 is the high pressure (for example, starting at 14 MPa), and the lower injection piston AC C—A 2 1 is the piston 2 1 1 Is pushed down, and high pressure oil is supplied to the head chamber 16 H of the cylinder 6 to advance at a high output, so the speed of the piston 13 is increased to a high speed value with a very short stroke.
  • Piston 1 3 stroke is detected by the stoichiometric sensor S a 4 6, and the piston 1 3 is moved forward by about 50 to 100 mm, and the 5th position is entered at the normal emission area.
  • Turn valve 2 8 OFF The timing for OFF of the fifth valve 28 is obtained from the test and is set to obtain a good forgery.
  • the state of the hydraulic circuit at that time is shown in FIG.
  • the upper accelerating piston ACC—B 2 2 in the upper part closes its discharge port, so the descent stops and the injection operation continues with only the lower injecting piston ACC—A 2 1.
  • the gas pressure that moves this piston is low (low pressure of gas bottle a 4 1.
  • the aluminum (AL) molten metal 15 flows into the cavity 1 2 in the mold. While cooling, the viscosity rises.
  • the piston 13 decelerates in balance with the resistance of the molten aluminum, and the filling of the molten aluminum 15 is completed with less shock.
  • the difference between the present invention and the conventional example will be described with reference to FIGS. 12 and 13, particularly regarding the injection speed and the metal pressure.
  • Figures 12 and 13 are diagrams of injection speed and metal pressure Pm (pressure of molten aluminum in the mold in the mold) in the high-speed forging method.
  • the horizontal axis represents the stroke (mm) and time ( msec)
  • the vertical axis represents the injection speed (m ⁇ sec) represented by a dotted line
  • the metal pressure (MPa) represented by a solid line, which corresponds to the case of the conventional example and the present invention, respectively.
  • the injection speed (V) rises instantaneously, and the metal pressure rises temporarily at that time. .
  • the piston continues to be pressed at a high pressure, but in this conventional example, the amount of the molten metal in the sleeve 7 is large, and the timing (point T 1 2) for lowering the pressure of the piston is relative. This is the case when it is late.
  • the timing is delayed, as shown in Fig. 12, a surge pressure is generated in which the metal pressure rises rapidly near T 1 2. This surge pressure causes flash and hot water spray.
  • the high pressure rising and the subsequent state are the same force as in the conventional example, the pressure pressing the piston 13 at the point T 2.
  • the metal pressure has not yet risen, and the piston is then pushed at a low pressure, but the force that moves forward by the inertial force of the piston itself becomes the resistance, and the speed of the piston 1 3 That is, the injection speed V gradually decreases.
  • the piston speed decreases.
  • the piston 13 continues to be pushed at a low pressure, so the piston 13 further moves forward, and the metal pressure Pm starts to rise from around the point T3.
  • surge pressure is not generated, and therefore, it is difficult to generate Paris and hot water spray.
  • Fig. 7 shows the state of pressure oil charge to the piston A C C (accumulator) 20 while waiting for solidification of the molten aluminum in the molded product while continuing pressurization.
  • Turn on the 8th valve 3 2 (and keep the 5th valve 2 8 in the QFF state) Pump the hydraulic oil from the pump AC (not shown) 2 1 8, Introduced in 2 2 8. Since the lower injection piston A C C 2 1 has a lower pressure, the lower piston 2 1 1 rises first. When the piston 2 1 1 at the bottom of the piston AC C 2 0 rises and hits the protrusion 2 2 2 of the upper piston 2 2 1, the upper piston ACC— B 2 2 Change starts. The state of the hydraulic circuit at that time is shown in FIG.
  • FIG. 11 is a schematic cross-sectional view of piston AC C (accumulator) 20.
  • Piston ACC (Accumulator Overnight) 2 0 is the upper high pressure rising piston AC C— B 2 2 and the lower injection piston AC C-A 2 1 is provided, and the upper high pressure rising piston ACC—B 2 2 and the lower injection piston ACC—A 2 1 are connected to each other.
  • the connection between these two accumulators is the upper high pressure rising piston ACC—B 2 2 lower wall 2 2 6 and / or the lower injection piston AC C—A 2 1 upper
  • the walls 2 1 6 are connected so as to be in contact with each other, and as shown in FIG. 11, the walls 2 2 6 and 2 1 6 are provided with a through hole 2 0 2 in the center and a sealing mechanism 2 0 1
  • the high-pressure rising piston ACC— B 2 2 is provided with a piston 2 2 1, and is attached to the center of the piston 2 2 1 in a downward direction, and preferably has a cylindrical rod-shaped protrusion 2 2 2 It comprises.
  • the protrusion 2 2 2 slidably penetrates the through hole 2 0 2 and the seal mechanism 2 0 1, and the seal mechanism 2 0 1 seals the cylindrical rod-shaped protrusion 2 2 2,
  • the hydraulic chamber 2 2 8 of the high-pressure start-up piston 8000—8 2 2 and the gas chamber 2 1 7 of the lower injection piston ACC-A 2 1 are hermetically isolated.
  • the high-pressure rising piston ACC—B 2 2 has an upper gas chamber 2 2 7 and a lower hydraulic oil chamber 2 2 8.
  • the gas chamber 2 2 7 and the hydraulic oil chamber 2 2 8 The piston 2 1 is hermetically sealed.
  • the injection piston ACC—A 2 1 also has an upper gas chamber 2 1 7 and a lower hydraulic oil chamber 2 1 8, and the gas chamber 2 1 7 and the hydraulic oil chamber 2 1 8 are The piston 2 1 1 is hermetically sealed.
  • High-pressure startup piston AC C- B 2 2 has a high-pressure gas inlet 2 2 4 on the upper wall facing the piston 2 2 1, and supplies gas from the gas bottle b 4 2 to the gas chamber 2 2 7 Connect the exhaust line.
  • High pressure start-up piston ACC— B 2 2 lower wall 2 2 6 near the side wall is provided with hydraulic oil outlet 2 2 5 where hydraulic oil is supplied and discharged from hydraulic chamber 2 2 8 Line connects.
  • Piston for injection ACC—A 2 1's lower wall facing the piston 2 1 1 A hydraulic oil outlet 2 1 5 is provided, to which a hydraulic oil supply / discharge line to the hydraulic oil chamber 2 1 8 is connected.
  • Piston for injection ACC— A side wall in the vicinity of the upper wall 2 1 6 of A 2 1 is provided with a low-pressure gas inlet 2 1 4 to supply gas from the gas bottle a 4 1 to the gas chamber 2 1 7 ′ Connecting.
  • the above-described configuration of the piston AC C 20 enables the above-described operation of the hydraulic circuit of the hydraulic device 103 according to the present embodiment.
  • FIG. 10 A second embodiment of the present invention is shown in FIG. Referring to FIG. 10, the element parts of FIG. 10 that are the same as or similar to the element parts of the first embodiment shown in FIGS. 2-9 are designated by the same reference numerals.
  • the die casting machine according to the second embodiment is configured for the same purpose as the die casting machine according to the first embodiment described above.
  • the hydraulic device 20 3 Only the difference. That is, the mold 10 1 and the injection cylinder 10 2 are exactly the same as those in the first embodiment.
  • B 2 2 is replaced with separate injection piston ACC (accumulation overnight) — A 3 2 1 and high pressure startup piston ACC (accumulator) 1 B 3 2 2
  • the piston ACC 1 A 3 2 1 for injection and the piston AC C— B 3 2 2 for high-pressure startup are the same in the accumulator that has a special structure like the piston ACC 2 0 of the first embodiment. Both have a known general accumulator structure.
  • piston accumulator is divided into two separate accumulators, and the injection piston AC C— A 3 2 1 in the second embodiment of FIG.
  • high pressure start-up piston ACC The hydraulic system around one B 3 2 2 is also different from that of the first embodiment.
  • Piston for high-pressure startup ACC The fifth valve 2 8 is provided between the hydraulic connection port of B 3 2 2 and the 6th valve 2 9 in the same way as in the first embodiment.
  • Hydraulic line to 2 accumulators 3 2 1, 3 2 2 (line from 8th valve 3 2) 5 1 is the 5th valve 2 2 8 and the high pressure rising piston ACC— B Connect to line (pipe) between 3 2 2 (M point).
  • this line 51 is also connected to the line 52 from the hydraulic oil outlet of the injection piston ACC—A 3 21 (N point).
  • a check valve 37 is provided between the M point and the N point. The check valve 37 prevents the hydraulic oil from flowing from the high pressure start-up piston ACC—B 3 2 2 into the low pressure injection piston ACC—A 3 2 1.
  • the line 5 3, as shown in FIG. Piston for injection ACC—A 3 2 1 Joins line 5 2 from the oil outlet at point P. Therefore, high-pressure hydraulic fluid may flow into the low-pressure injection piston ACC—A 3 2 1 via this line 5 3.
  • a check valve 3 8 is provided between points P to prevent high-pressure hydraulic fluid from flowing into the injection piston ACC—A 3 2 1.
  • the fifth valve 2 2 8 of the second embodiment is different from the fifth valve 2 8 of the first embodiment, as can be seen by comparing FIG. 2 and FIG. 10. It has a structure that does not form a system that communicates with tank 40 at FF, but closes the line at OFF.
  • Piston ACC— B 3 2 2 for high-speed startup is closed, but the 6th valve 29 is in the N state, so the injection operation is continued with only the piston ACC— A 3 2 1 for injection. .
  • the gas pressure that moves the piston is low (low pressure in the gas bottle a41, for example about 6MPa here)
  • the molten aluminum (AL) is cooled while flowing into the cavity 12 in the mold.
  • the piston 13 decelerates in balance with the resistance of the AL molten metal, and the filling is completed with little shock (similar to the first embodiment).
  • the operation of the hydraulic circuit is substantially the same as that of the first embodiment.
  • Actuation of other hydraulic circuits ie, piston ACC—B 3 2 2 for starting up at high speed, actuation of ACC 2 3 for boosting, piston of injection cylinder after injection molding (forging) 1 0 2 1 3
  • high-speed startup piston ACC—B 3 2 2 and injection piston ACC—A 3 2 1 operation for filling the hydraulic oil chamber, etc. are the same as in the first embodiment It is. Since the configuration of the second embodiment other than the above is basically the same as that of the first embodiment, description thereof will be omitted to avoid duplication.
  • FIG. 16 schematically shows a hydraulic circuit of a hydraulic device 30 3 according to the third embodiment of the present invention that drives the injection cylinder 10 2.
  • a large flow rate can be discharged for high-speed injection through the high-speed speed adjustment valve (seventh valve) 3 1 that controls the injection speed at the head chamber of cylinder 6 1 6 H.
  • An effective injection piston accumulator (ACC) 20 is provided in fluid communication.
  • the cylindrical piston accumulator 20 for injection is divided into two chambers by a piston 2 1 1 that slides and reciprocates in a piston accumulator 20.
  • the hydraulic oil chamber 2 1 8 in which the working oil is accommodated, and the other is the gas chamber 2 1 7 in which the gas is accommodated.
  • the gas chamber 2 1 7 is supplied with high-pressure gas from the gas pot, and presses the piston 2 1 1 to supply the hydraulic oil in the hydraulic oil chamber to the hydraulic circuit of the hydraulic device 3 0 3, that is, the injection cylinder 1 here. 0 2 Head chamber 1 6 Supply to H.
  • the gas chamber 2 17 is provided with three switching valves, that is, first, second and third switching valves 7 5, 7 6 and 7 7, respectively, as shown in FIG.
  • fluid communication is performed in parallel with the first, second, and third gas bottles 7 1, 7 2, and 7 3.
  • the head chamber 16 H of the injection cylinder 10 2 is further provided with a boost time adjusting valve 78 and a boost opening / closing valve (first 1)
  • the fluid is in fluid communication with the boosting accumulator (ACC) 2 3 via 3 5.
  • Rod chamber of injection cylinder 1 0 2 1 6 R connection port line is in fluid communication with tank 4 0 via tank switching valve (4th valve) 2 7, and switching valve for injection (3rd valve) 2 Connect the fluid to the pump pressure supply port 5 5 via 6.
  • the connection port of the head chamber 16 H is connected to another connection port of the injection switching valve (third valve) 26.
  • the switching valve for injection (third valve) 26 is preferably an electromagnetic switching valve having three switching positions. As shown in Fig. 16, the two connection ports on one side are each injection ports. Cylinder 10 2 Head chamber 1 6 Connected to H connection port and Rod chamber 1 6 R connection port, the other 2 connection ports are tank 4 0 and pump pressure supply respectively Port (hydraulic pump discharge port) 5 Connect to 5.
  • the high speed speed adjusting valve (seventh valve) 3 1 is preferably a motor driven valve capable of continuously changing the opening degree from the fully open position to the fully closed position.
  • the pressure increase time adjustment valve 7 8 is preferably a motor-driven throttle valve, and its opening degree can be continuously changed. adjust.
  • the injection switching valve (third pulp) 26 has already been explained, but the three positions are shown in Fig. 16 as follows: the flow path closed position, the forward flow path open position, and the cross flow Road opening position.
  • the 1st, 2nd and 3rd switching valves of gas bottles 7 5, 7 6, 7 7, booster opening / closing valve (1st 1 valve) 3 5 and tank switching valve (4th valve) 2 7 are opened An electromagnetic switching valve that switches between closed and closed is preferred.
  • the overall operation of the die-cast machine 100 is the same as that of a normal die-cast machine, so it will be outlined.
  • AL molten metal 15 is supplied to the plunger one sleeve 7, and then the injection operation is performed without delay so that the molten metal temperature does not decrease.
  • the molten metal 15 is pushed toward the mold 1 0 1 cavity 1 2 by the low speed screw 1 3 (low speed injection stage).
  • the piston 13 is driven at this time by operating the injection switching valve 2 6 to operate a hydraulic pump (a combination of a pump pressure supply port, a variable pump or a constant discharge pump and a flow control valve).
  • a hydraulic pump a combination of a pump pressure supply port, a variable pump or a constant discharge pump and a flow control valve.
  • the novel configuration of the present invention functions.
  • the cavity 12 is filled with molten metal 15.
  • the pressure inside the cavity is increased to a predetermined pressure within a predetermined time (pressure increase stage).
  • a predetermined pressure is held for a predetermined time (pressurization holding stage).
  • take out the product (mold opening stage).
  • the above is the outline of the injection molding process.
  • the operation of the hydraulic device 303 of the present embodiment will be described.
  • the number of gas bottles may be less (2) or more (4 or more).
  • the die casting machine is assumed to be 800 ton class.
  • the gas chamber capacity of the injection accumulator 20 is preferably 10 L (liter).
  • the diameter of the piston head 5 of the injection cylinder 10 2 is 150 mm, and the stroke (high-speed stroke) at the time of high-speed injection of the piston 1 3 of the injection cylinder 10 2 is 20
  • the charge pressure (pressure in the gas chamber 2 17 before the injection operation) of the piston accumulator for injection 20 mm or more is 18.6 MPa.
  • the first gas bottle 7 1 has 10 L for each of the three gas pothole capacities.
  • the second gas bottle 72 preferably has a capacity of 20 L
  • the third gas bottle 73 has a capacity of 40 L.
  • the capacity of the three gas bottles is preferably 1: 2: 4.
  • the gas bottles 7 1, 7 2, 7 3 having three kinds of capacities
  • eight combinations can be considered as the total capacity of the gas bottles that press the injection piston accumulator. (See the table in Figure 17). That is, it can be seen from the table in FIG. 17 that these eight combinations can be realized by operating the first, second and third switching valves 7 5, 7 6 and 7 7 with each gas bottle. The That is, if all the three switching valves 7 5, 7 6, 7 7 are closed, the gas bottle capacity is 0 L and the effective total gas capacity is the volume 10 L of the gas chamber 2 17.
  • the total gas capacity is 20 L
  • the total gas capacity is 80 L when the total gas bottle capacity is 70 L + gas chamber capacity is 10 L.
  • Figure 18 may be obtained by actually operating the injection device (empty shot) or by calculation (adiabatic expansion change of gas). The larger the total gas capacity of the gas pot, the smaller the pressure drop, and the higher the average pressure for pressing the piston 4, the higher the injection speed.
  • the optimum gas bottle combination is selected (opening / closing operation of the switching valve) according to the characteristics of the mold to be fabricated (capacity and projected area), and high injection speed is achieved.
  • it is a method of preventing the occurrence of surge pressure and the like by naturally decelerating using the pressure drop (drop) generated by gas expansion that occurs during high-speed ejection.
  • trial driving is used as a method to determine the injection speed, final filling force (hydraulic pressure on the injection cylinder head: PH), and holding pressure at which a high quality forged product can be molded. It is preferable to implement as follows.
  • a low speed (about 2 m / sec), a low pressure (about 10 MPa), and a holding pressure start from about 5 MPa. If the injection speed is low, the molten metal will solidify during filling and poor hot water will occur. Check the forged product and if the hot water is not enough, increase the injection speed. At this time, if the set value of the final filling force is small (the total gas volume is small), the injection speed will drop below the set value in the middle due to the flow resistance. In this case, increase the final filling force (increase the total gas capacity) and adjust so that the high-speed injection speed naturally decelerates so that the pressure can be smoothly increased and maintained.
  • Figure 23 shows the time variation of the injection speed and injection pressure (pressure of the injection cylinder 10 2 head 16 H), etc., and the piston rod and each valve in this embodiment.
  • the chart showing a state is shown.
  • PH indicates the pressure in the head chamber 16 H
  • P m indicates the holding pressure of the boost piston accumulator.
  • the low-speed injection stage is between times t0 and t1
  • the high-speed injection stage is between times tl and t2
  • the boosting stage is between times t2 and t3.
  • the stage is between times t 3 and t 4.
  • switching from the high-speed injection stage to the boosting stage ie, switching the high-speed speed adjustment valve (seventh valve) 3 1 (desired opening) Switch from pressure to on / off (first valve 1) 3 5 (close force, to open))
  • detecting pressure (PH) in head chamber 16 H or injection screw This is done by detecting the position of ton 4 or by using the detected values for both pressure PH and piston position.
  • the operation of piston 4, the operation of each valve, etc. can be fully understood by looking at Fig. 23, so detailed explanations are omitted.
  • FIG. 19 is a system diagram of a fourth embodiment of the hydraulic apparatus of the die-cast machine 100 according to the present invention.
  • the hydraulic device 40 3 of the fourth embodiment is different from the hydraulic device 30 3 of the third embodiment only in the configuration near the gas bottle. That is, in the hydraulic circuit of the hydraulic device 40 3 in FIG. 19, the first, second and third gas bottles 7 1, 7 2, 7 3 and 3 in the hydraulic circuit of the hydraulic device 30 3 in FIG.
  • the first, second, and third switching valves 7 5, 7 6, 7 7 are replaced by gas bottles 80 and a filling force pattern adjusting valve 8 2.
  • the other configurations of the hydraulic device 40 3 are basically the same as those of the hydraulic device 30 3 of the third embodiment shown in FIG.
  • the operation of the die casting machine and hydraulic device 40 3 according to the present embodiment is different from the third embodiment only in the operation at the high-speed injection stage. Only the operation during high-speed injection (stage) will be described.
  • the piston accumulator for injection from the gas bottle 80 is changed by changing the valve opening degree of the filling force pattern adjusting valve 82.
  • the pressure of the gas to the piston 2 1 1 by changing the passage resistance of the pipe up to 20 0, the final charge of hydraulic oil to the head chamber 1 6 H of the injection cylinder 10 2 is achieved.
  • Filling force pattern adjustment valve 8 2 is a motor-driven throttle A valve is preferred.
  • FIGS. 20 to 22 show an explanatory diagram of changing the filling force pattern by the throttle valve (filling capacity adjustment valve 8 2) of the gas supply line.
  • Figures 20 to 2 2 show the changes over time in the pressure (PH) (MPa) of the head chamber during idle firing when the high-speed injection speed is 2, 5, and 8 (m / sec). The graph is called the filling force pattern).
  • the valve opening is 0.02 m (solid line), 0.0 0 3 m (dashed line), 0.0 0 1 m (dashed line), 0.0 0 0 0 2 m (2 The case of the dotted line) is shown.
  • Figures 20 to 2 2 may be obtained by theoretical calculation, or by actual blanking.
  • Figures 20 to 22 show the difference in the time drop pattern of the head chamber pressure (PH) depending on the valve opening at each injection speed.
  • the final filling force is the pressure at the point where the head chamber pressure (PH) drops.
  • the greater the pressure drop the more the piston driving force of the injection cylinder 102 is reduced, that is, the piston is decelerated (filling force is reduced), and the generation of surge pressure is suppressed.
  • the injection cylinder head pressure once lowered returns again, but before that return, switch the hydraulic valve (open the boost valve 3 5 and open the high-speed speed adjustment valve 3 1) to move from the high-speed injection stage to the pressure-up stage. It can be seen from Fig. 20 ⁇ 22 that there is enough time to make it possible.
  • the die casting machine of the present embodiment preferably includes an automatic control device having an arithmetic circuit for calculating the filling pattern.
  • the automatic calculation circuit of the automatic controller inputs the injection stroke, high-speed injection speed, and final filling force at the high-speed injection stage. Then, it is preferable that the valve opening degree of the filling force pattern adjustment valve 82 is finally determined.
  • a method for determining the optimum valve opening by trial strike It is preferable to implement.
  • the trial hitting is performed so that the valve opening degree of the filling force pattern adjusting valve 82 is sequentially increased from a small value. At each trial run, check the quality of the manufactured product and select the optimum conditions.
  • FIG. 24 shows the time variation of the injection speed and injection pressure (pressure of the injection cylinder 10 2 head 16 H) and the piston rod at that time in the fourth embodiment. It is a chart indicating the state of a valve or the like.
  • Figure 24 is basically the same drawing as Figure 23, and the symbols and symbols are the same as those in Figure 23. 1st, 2nd and 3rd switching valves in Fig. 23 3 7 5, 7 6, 7 7 forces Fig. 2 4 does not exist, instead, filling force.
  • Pattern adjustment valve 8 2 time is shown. In FIG. 24, it can be seen that the filling force pattern adjusting valve 8 2 is held at a constant opening when forging is started.
  • the piston is started at a high pressure without reducing the pressure that drives (presses) the piston of the injection cylinder.
  • the generation of surge pressure of molten aluminum in the mold cavity is reduced, and the occurrence of burrs and hot water spray is prevented.
  • the piston accumulator (A C C) with a special structure can be installed in a compact space, so it can be cost effective.
  • the pressure drop of the driving hydraulic oil due to gas expansion is used by appropriately selecting a combination of multiple gas bottles.
  • the high pressure is set up during a short time, the high speed is increased in a short time, and the pressure is lowered to the optimum value before the filling is completed.
  • Natural deceleration by resistance reduces the high speed value, mitigates the impact at the completion of filling, enables high speed injection molding, and suppresses the generation of surge pressure of molten aluminum in the mold cavity at that time, Prevent burrs, hot water spray, or hot water splash.
  • the material of forging (molten metal) is described as aluminum, but other materials may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

L'invention concerne une machine à coulée sous pression dans laquelle l'apparition de toute pointe de pression est réduite afin d'empêcher la production de bavures et l'extraction par soufflage de métal fondu et minimiser les variations dans la qualité du moulage au niveau d'un site de moulage. La machine à coulée sous pression présente une moule (101) pour le moulage d'un produit, un cylindre d'injection (102) permettant d'injecter du métal fondu (15) dans le moule, et un dispositif hydraulique (103) destiné à comprimer le cylindre d'injection à une pression élevée. Le dispositif hydraulique présente un accumulateur à piston (20) pour l'alimentation en huile d'actionnement afin de comprimer un piston (13) du cylindre d'injection (102) vers le cylindre d'injection et présente également une soupape d'admission du cylindre d'injection (31). L'accumulateur à piston présente un accumulateur à piston à haute vitesse (22, 322) pour un processus de démarrage à haute vitesse et présente également un accumulateur à piston à faible vitesse (21, 321) pour l'injection.
PCT/JP2007/070296 2006-10-25 2007-10-11 Machine à coulée sous pression et procédé de coulage sous pression WO2008050659A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/447,000 US20100000699A1 (en) 2006-10-25 2007-10-11 Die casting machine and die casting method

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006-290165 2006-10-25
JP2006290165A JP4997921B2 (ja) 2006-10-25 2006-10-25 ダイカストマシン及びダイカスト鋳造法
JP2007-229335 2007-09-04
JP2007229335A JP2009061458A (ja) 2007-09-04 2007-09-04 ダイカストマシン及びダイカスト鋳造方法

Publications (1)

Publication Number Publication Date
WO2008050659A1 true WO2008050659A1 (fr) 2008-05-02

Family

ID=39324458

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/070296 WO2008050659A1 (fr) 2006-10-25 2007-10-11 Machine à coulée sous pression et procédé de coulage sous pression

Country Status (2)

Country Link
US (1) US20100000699A1 (fr)
WO (1) WO2008050659A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102076445B (zh) * 2008-07-04 2013-06-26 东洋机械金属株式会社 压铸机
CN107363239A (zh) * 2017-09-05 2017-11-21 广东顺德固德威精密机械有限公司 一种镁合金冷室压铸机的快压射截止机构

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5760769B2 (ja) * 2011-07-06 2015-08-12 株式会社豊田自動織機 射出装置
JP5672179B2 (ja) * 2011-07-06 2015-02-18 株式会社豊田自動織機 射出装置
JP5673481B2 (ja) 2011-10-19 2015-02-18 株式会社豊田自動織機 射出装置
JP5673482B2 (ja) 2011-10-19 2015-02-18 株式会社豊田自動織機 射出装置
JP5673483B2 (ja) 2011-10-19 2015-02-18 株式会社豊田自動織機 射出装置
JP5905617B1 (ja) * 2015-03-27 2016-04-20 東芝機械株式会社 射出装置及び成形装置
CN105081260A (zh) * 2015-09-06 2015-11-25 无锡贺邦金属制品有限公司 一种洗衣机滚轮支架压铸工艺
US10179433B2 (en) * 2017-03-02 2019-01-15 Ford Global Technologies, Llc Method of forming a headrest assembly
JP6840644B2 (ja) * 2017-09-05 2021-03-10 株式会社東芝 半導体装置
CN107552755A (zh) * 2017-09-30 2018-01-09 昆山盛事达机械有限公司 半固态镁合金增压系统
JP7356687B2 (ja) * 2020-01-15 2023-10-05 本田技研工業株式会社 部品の鋳造方法及び部品
CN116060594B (zh) * 2023-03-02 2023-07-18 宁波力劲科技有限公司 一种大型压铸机压射油缸的增压系统
CN117644193B (zh) * 2024-01-29 2024-04-05 宁波力劲科技有限公司 一种压铸机的压射系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0871725A (ja) * 1994-09-06 1996-03-19 Ube Ind Ltd ダイカストマシンの射出装置
JPH1110309A (ja) * 1997-06-20 1999-01-19 Ube Ind Ltd ダイカストマシンの射出力制御方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0871725A (ja) * 1994-09-06 1996-03-19 Ube Ind Ltd ダイカストマシンの射出装置
JPH1110309A (ja) * 1997-06-20 1999-01-19 Ube Ind Ltd ダイカストマシンの射出力制御方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102076445B (zh) * 2008-07-04 2013-06-26 东洋机械金属株式会社 压铸机
CN107363239A (zh) * 2017-09-05 2017-11-21 广东顺德固德威精密机械有限公司 一种镁合金冷室压铸机的快压射截止机构
CN107363239B (zh) * 2017-09-05 2022-11-29 广东顺德固德威精密机械有限公司 一种镁合金冷室压铸机的快压射截止机构

Also Published As

Publication number Publication date
US20100000699A1 (en) 2010-01-07

Similar Documents

Publication Publication Date Title
WO2008050659A1 (fr) Machine à coulée sous pression et procédé de coulage sous pression
JP4997921B2 (ja) ダイカストマシン及びダイカスト鋳造法
US20090242161A1 (en) Injection device for die casting machine
US7316259B2 (en) Diecasting machine
JP2008155280A (ja) ダイカストマシンの射出装置
JP2011131225A (ja) ダイカストマシンの射出装置および射出制御方法
JP6146878B2 (ja) 射出装置、成形装置及び成形方法
US9889500B2 (en) Die casting machine and control method of die casting machine
CN113677456A (zh) 压铸机、带模具的压铸机、压铸机用控制装置以及压铸方法
KR100523172B1 (ko) 다이캐스트머시인사출제어방법및장치
JP5381161B2 (ja) ダイカストマシン及びダイカスト鋳造方法
CN113795343A (zh) 注射装置以及成型机
US7004224B2 (en) Diecasting machine
JP3854014B2 (ja) ダイカストマシンの射出装置およびその射出制御方法
JP3662001B2 (ja) ダイカストマシンの射出方法
JP2009131868A (ja) ダイカストマシンの昇圧アキュムレータ用ブースタ及び制御方法
JP2008246503A (ja) 鋳造方法及びダイカストマシン
JP2009061458A (ja) ダイカストマシン及びダイカスト鋳造方法
JP5605445B2 (ja) ダイカストマシン及びダイカスト鋳造方法
JP2020146744A (ja) ダイカストマシンおよび成形品生産方法
JP2023066641A (ja) 局部加圧装置、成形機及び成形方法
JPS642469B2 (fr)
JP2004160890A (ja) 縦型射出成形機
WO2023074851A1 (fr) Dispositif de mise sous pression locale, machine de moulage et procédé de moulage
JP7392523B2 (ja) ダイカスト成形方法および制御装置

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200780037676.6

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07830030

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2572/DELNP/2009

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 12447000

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07830030

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)