WO2022176898A1 - 射出装置、成形機、及び成形機の制御方法 - Google Patents
射出装置、成形機、及び成形機の制御方法 Download PDFInfo
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- WO2022176898A1 WO2022176898A1 PCT/JP2022/006130 JP2022006130W WO2022176898A1 WO 2022176898 A1 WO2022176898 A1 WO 2022176898A1 JP 2022006130 W JP2022006130 W JP 2022006130W WO 2022176898 A1 WO2022176898 A1 WO 2022176898A1
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- Prior art keywords
- rod
- side chamber
- hydraulic fluid
- amount
- piston
- Prior art date
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- 238000002347 injection Methods 0.000 title claims abstract description 171
- 239000007924 injection Substances 0.000 title claims abstract description 171
- 238000000465 moulding Methods 0.000 title claims description 71
- 238000000034 method Methods 0.000 title claims description 55
- 239000012530 fluid Substances 0.000 claims abstract description 117
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000011344 liquid material Substances 0.000 claims description 7
- 238000001746 injection moulding Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 description 78
- 238000004512 die casting Methods 0.000 description 52
- 238000010586 diagram Methods 0.000 description 24
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 239000003921 oil Substances 0.000 description 12
- 230000035939 shock Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B22D17/32—Controlling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
Definitions
- the present invention relates to an injection device that fills a cavity in a mold with a liquid material, a molding machine, and a control method for the molding machine.
- a die-casting machine manufactures a molded product (die-cast product) by using an injection device to fill a cavity in a mold clamped with a mold clamping device with molten metal.
- the injection device includes, for example, an injection cylinder as an actuator.
- the injection cylinder includes, for example, a rod connectable to a plunger that slides within a sleeve, an injection piston fixed to the rod, and a cylinder tube that slidably houses the piston therein.
- the cylinder tube has therein a rod-side chamber in which the rod is arranged and a head-side chamber located on the opposite side of the rod-side chamber with the injection piston interposed therebetween.
- the injection piston By supplying hydraulic oil to the head-side chamber, the injection piston moves to the rod side. As the injection piston moves, the plunger advances through the sleeve toward the mold, filling the cavity in the mold with molten metal.
- the speed of the injection piston is controlled, for example, by controlling the flow rate of hydraulic oil discharged from the rod-side chamber using a flow control valve.
- This control method is called meter-out control.
- Patent Literature 1 describes an injection device that includes an auxiliary hydraulic supply unit that replenishes hydraulic fluid when the pressure of hydraulic fluid in the rod-side chamber is below a reference value in order to suppress sudden ejection of the injection piston.
- an injection device is also used to extrude a molded product from a mold.
- the part By advancing the injection piston, the part is forced out of the plunger and out of the mold.
- a pressure shock occurs when the injection piston suddenly ejects when the molded product is pushed out of the mold. The occurrence of pressure shock can lead to failure of the molded product and damage to the structure of the die casting machine.
- Injection equipment is also used, for example, during maintenance of die casting machines.
- an injection device is used to move the plunger within the sleeve. When the plunger is moved, if the injection piston suddenly protrudes, the accuracy of position control of the plunger decreases.
- the problem to be solved by the present invention is to provide an injection device, a molding machine, and a control method for the molding machine that can suppress sudden ejection of the piston.
- An injection device of one aspect of the present invention includes a rod connectable to a plunger that slides in a sleeve, a piston fixed to the rod, a cylinder tube that slidably houses the piston, and the rod: an injection cylinder including a rod-side chamber and a head-side chamber located on the opposite side of the rod-side chamber with the piston interposed therebetween; a hydraulic pump with a variable discharge rate of hydraulic fluid; a flow rate control valve for controlling the flow rate of the hydraulic fluid to be discharged; and a discharge rate of the hydraulic fluid of the hydraulic pump in a state where the flow rate control valve is open when advancing the piston toward the rod. a control unit that controls and changes the supply amount of the hydraulic fluid to the head-side chamber so as to increase continuously or stepwise.
- control section changes the amount of change in the amount of discharge of the hydraulic fluid from the hydraulic pump.
- the injection apparatus of the above aspect further includes a pressure sensor that measures the pressure of the working fluid in the head-side chamber, and the control unit, based on the pressure of the working fluid in the head-side chamber measured by the pressure sensor, It is preferable to change the amount of change in the discharge amount of the hydraulic fluid of the hydraulic pump.
- control unit reduces the discharge amount of the hydraulic fluid from the hydraulic pump when the pressure of the hydraulic fluid in the head-side chamber measured by the pressure sensor reaches a predetermined pressure. It is preferable to reduce the amount of change.
- the injection apparatus of the above aspect further comprises a position sensor for measuring the position of the rod or the piston, and the control unit controls the hydraulic pump based on the position of the rod or the piston measured by the position sensor. It is preferable to change the amount of change in the discharge amount of the hydraulic fluid.
- control unit discharges the hydraulic fluid from the hydraulic pump based on the speed of the rod or the piston calculated from the position of the rod or the piston measured by the position sensor. It is preferable to vary the amount of change in quantity.
- an accumulator for increasing the flow rate of the hydraulic fluid supplied to the head-side chamber, a first flow path for supplying the hydraulic fluid to the accumulator using the hydraulic pump, a second flow path that supplies the hydraulic fluid to the head-side chamber using the accumulator; a third flow path that discharges the hydraulic fluid from the rod-side chamber and has the flow control valve; and the hydraulic pump. and a fourth flow path different from the first flow path, wherein the control unit controls the hydraulic pump and the fourth flow path to supply the hydraulic fluid to the head-side chamber using It is preferable that the hydraulic fluid is supplied to the head-side chamber using a head-side chamber.
- a molding machine includes the injection device, a mold clamping device that clamps a mold, and an extrusion device that extrudes a molded product from the mold, wherein the injection device Inject a liquid material into it.
- a molding machine control method includes a mold clamping device that clamps a mold, an extrusion device that pushes a molded product out of the mold, and a rod that can be connected to a plunger that slides in a sleeve.
- a piston fixed to the rod a cylinder tube slidably housing the piston; a rod-side chamber in which the rod is disposed; and a head located on the opposite side of the rod-side chamber with the piston interposed therebetween an injection cylinder containing a side chamber, a hydraulic pump capable of varying the discharge rate of hydraulic fluid, and a flow rate control valve for controlling the flow rate of the hydraulic fluid discharged from the rod side chamber; and an injection device that injects a liquid material using the plunger, wherein when the piston is advanced toward the rod, the liquid is The amount of the hydraulic fluid discharged from the pressure pump is controlled so that the amount of the hydraulic fluid supplied to the head-side chamber increases continuously or stepwise.
- the injection device further includes a pressure sensor that measures the pressure of the hydraulic fluid in the head-side chamber, and the pressure of the hydraulic fluid in the head-side chamber measured by the pressure sensor. It is preferable to change the amount of change in the discharge amount of the hydraulic fluid from the hydraulic pump based on the above.
- the amount of change in the discharge amount of the working fluid from the hydraulic pump is preferably reduced.
- the injection device further includes a position sensor for measuring the position of the rod or the piston, and based on the position of the rod or the piston measured by the position sensor, the It is preferable to change the amount of change in the discharge amount of the working fluid of the hydraulic pump.
- the discharge amount of the hydraulic fluid of the hydraulic pump is adjusted based on the speed of the rod or the piston calculated from the position of the rod or the piston measured by the position sensor. It is preferable to change the amount of change.
- an injection device a molding machine, and a control method for the molding machine that can suppress sudden ejection of the piston.
- FIG. 1 is a schematic diagram showing the configuration of an injection device according to a first embodiment;
- FIG. Explanatory drawing of the control method of the molding machine of 1st Embodiment.
- Explanatory drawing of the control method of the molding machine of 1st Embodiment. Explanatory drawing of the control method of the molding machine of 1st Embodiment.
- FIG. 1 is a schematic diagram showing the configuration of an injection device according to a first embodiment
- FIG. Explanatory drawing of the control method of the molding machine of 1st Embodiment.
- FIG. 5 is an explanatory diagram of a control method of a molding machine in a comparative example of the first embodiment;
- FIG. 5 is an explanatory diagram of a control method of a molding machine according to a modification of the first embodiment;
- the schematic diagram which shows the structure of the injection device of 2nd Embodiment.
- Explanatory drawing of the control method of the molding machine of 2nd Embodiment Explanatory drawing of the control method of the molding machine of 2nd Embodiment.
- Explanatory drawing of the control method of the molding machine of 2nd Embodiment. Explanatory drawing of the control method of the molding machine of 2nd Embodiment.
- hydraulic pressure will be used as an example of hydraulic pressure.
- description will be made using a hydraulic pump as an example of the hydraulic pump.
- hydraulic pressure it is also possible to use, for example, water pressure.
- description will be made using hydraulic oil as an example of the hydraulic fluid.
- the injection device of the first embodiment includes a rod connectable to a plunger that slides in a sleeve, a piston fixed to the rod, a cylinder tube that slidably houses the piston, and a rod.
- an injection cylinder including a rod-side chamber and a head-side chamber located on the opposite side of the rod-side chamber with the piston interposed therebetween; a hydraulic pump;
- the flow rate control valve is opened to control the amount of hydraulic fluid discharged from the hydraulic pump, and the amount of hydraulic fluid supplied to the head-side chamber increases continuously or stepwise. and a control unit that changes so as to
- the molding machine of the first embodiment includes the injection device, a mold clamping device that clamps the mold, and an extrusion device that extrudes the molded product from the mold. Inject liquid material.
- FIG. 1 is a schematic diagram showing the overall configuration of the molding machine of the first embodiment.
- FIG. 1 is a side view partially including a cross-sectional view.
- a molding machine of the first embodiment is a die casting machine 100 .
- the die casting machine 100 is, for example, a cold chamber type die casting machine.
- the die casting machine 100 includes a mold clamping device 10, an extrusion device 12, an injection device 14, a mold 18, and a control unit 20.
- the die casting machine 100 comprises a base 22, a fixed die plate 24, a movable die plate 26, a link housing 28, a tie bar 30, a sleeve 31 and a plunger 33.
- the plunger 33 has a plunger tip 33a and a plunger rod 33b.
- the die casting machine 100 injects and fills a liquid metal (molten metal) into the mold 18 (cavity Ca in FIG. 1), and solidifies the liquid metal in the mold 18 to produce a die cast product (molded product ) is a machine that manufactures
- Metals are, for example, aluminum, aluminum alloys, zinc alloys, or magnesium alloys.
- Liquid metal (molten) is an example of a liquid material.
- the mold 18 includes a fixed mold 18a and a movable mold 18b.
- a mold 18 is provided between the mold clamping device 10 and the injection device 14 .
- the fixed die plate 24 is fixed on the base 22.
- the stationary die plate 24 can hold the stationary die 18a.
- the movable die plate 26 is provided on the base 22 so as to be movable in the mold opening/closing direction.
- the mold opening/closing direction means both the mold opening direction and the mold closing direction shown in FIG.
- the movable die plate 26 can hold the movable mold 18b facing the fixed mold 18a.
- a link housing 28 is provided on the base 22 .
- One end of a link mechanism that constitutes the mold clamping device 10 is fixed to the link housing 28 .
- the fixed die plate 24 and the link housing 28 are fixed by tie bars 30.
- the tie bar 30 supports the mold clamping force while the mold clamping force is applied to the fixed mold 18a and the movable mold 18b.
- the mold clamping device 10 has a function of opening and closing the mold 18 and clamping the mold.
- the injection device 14 has the function of injecting the molten metal into the cavity Ca of the mold 18 and pressurizing the molten metal.
- the injection device 14 comprises a rod 80 connectable to a plunger 33 that slides within the sleeve 31 .
- the extruding device 12 has a function of extruding the manufactured die cast product from the mold 18.
- the sleeve 31 communicates with the cavity Ca of the mold 18.
- the sleeve 31 is, for example, a cylindrical member connected to the stationary mold 18a.
- the sleeve 31 is, for example, cylindrical.
- the plunger 33 slides inside the sleeve 31 .
- Plunger 33 includes a plunger tip 33a and a plunger rod 33b.
- a plunger tip 33a fixed to the tip of the plunger rod 33b slides in the sleeve 31 in the front-rear direction. The forward sliding of the plunger tip 33 a within the sleeve 31 pushes the molten metal within the sleeve 31 into the die 18 .
- the control unit 20 includes a control device 32, an input device 34, and a display device 36.
- the control unit 20 has a function of controlling the molding operation of the die casting machine 100 using the mold clamping device 10 , the extrusion device 12 and the injection device 14 .
- the input device 34 accepts the operator's input operation.
- the operator can use the input device 34 to set molding conditions and the like for the die casting machine 100 .
- the input device 34 is, for example, a touch panel using a liquid crystal display or an organic EL display.
- the display device 36 displays, for example, the molding conditions and operating conditions of the die casting machine 100 on the screen.
- the display device 36 is, for example, a liquid crystal display or an organic EL display.
- the control device 32 has a function of performing various calculations and outputting control commands to each part of the die casting machine 100 .
- the control device 32 has, for example, a function of storing molding conditions and the like.
- the control device 32 controls the operation of the injection device 14, for example.
- the control device 32 is composed of, for example, a combination of hardware and software.
- the control device 32 includes, for example, a CPU (Central Processing Unit), a semiconductor memory, and a control program stored in the semiconductor memory.
- a CPU Central Processing Unit
- FIG. 2 is a schematic diagram showing the configuration of the injection device of the first embodiment.
- the injection device 14 has the function of injecting and filling the cavity Ca in the mold 18 with the molten metal in the sleeve 31, for example.
- the injection device 14 has, for example, a function of pushing out a die cast product from a mold 18 .
- the injection device 14 has a function of moving the plunger 33 inside the sleeve 31 during maintenance of the die casting machine 100, for example.
- the injection device 14 includes an injection cylinder 44, a hydraulic pump 46 (hydraulic pump), an oil tank 48, an accumulator 50, a position sensor 52, a pressure sensor 53, an injection valve 54, a speed control valve 56 (flow control valve), a direction Switching valve 58, first opening/closing valve 60, second opening/closing valve 62, filling/replenishing valve 64, first channel 70a, second channel 70b, third channel 70c, fourth channel 70d, a fifth flow path 70e, a sixth flow path 70f, and a controller 72 (control unit).
- the hydraulic pump 46 is an example of a hydraulic pump.
- the speed control valve 56 is an example of a flow control valve.
- Controller 72 is an example of a control unit.
- the injection cylinder 44 includes a rod 80 , an injection piston 82 (piston), a cylinder tube 84 , a rod side chamber 86 and a head side chamber 88 .
- the injection piston 82 is an example of a piston.
- the rod 80 is connectable to a plunger 33 that slides within the sleeve 31 . Movement of rod 80 moves plunger 33 within sleeve 31 .
- the injection piston 82 is fixed to the rod 80.
- the injection piston 82 is slidably housed in the cylinder tube 84 .
- the injection piston 82 is, for example, cylindrical.
- the cylinder tube 84 slidably accommodates the injection piston 82 .
- the cylinder tube 84 is, for example, cylindrical.
- a rod-side chamber 86 is provided inside the cylinder tube 84 on the rod 80 side.
- a rod 80 is arranged in the rod-side chamber 86 .
- a head-side chamber 88 is provided inside the cylinder tube 84 on the side opposite to the rod 80 side.
- the head side chamber 88 is located on the opposite side of the rod side chamber 86 with the injection piston 82 interposed therebetween.
- the hydraulic pump 46 is driven by, for example, a pump motor (not shown).
- the hydraulic pump 46 has a function of drawing up hydraulic oil from an oil tank 48 and discharging it.
- the hydraulic pump 46 contributes to, for example, supplying hydraulic fluid to the accumulator 50 and supplying hydraulic fluid to the injection cylinder 44 .
- the discharge amount or discharge pressure of hydraulic oil discharged by the hydraulic pump 46 is variable.
- the hydraulic pump 46 is, for example, a variable displacement pump.
- a variable displacement pump can change the discharge amount and discharge pressure of hydraulic oil.
- the oil tank 48 stores hydraulic oil to be supplied to the accumulator 50 and the injection cylinder 44, for example. Also, the oil tank 48 collects hydraulic oil used in the accumulator 50 and the injection cylinder 44, for example.
- the accumulator 50 has a function of increasing the flow rate of hydraulic oil supplied to the head-side chamber 88 .
- the accumulator 50 accumulates energy using the high-pressure sealed gas, and releases the energy momentarily to increase the flow rate of hydraulic oil.
- the injection cylinder 44 can be operated at high speed.
- the first flow path 70 a connects the hydraulic pump 46 and the accumulator 50 . Using the first flow path 70a, hydraulic fluid can be supplied from the hydraulic pump 46 to the accumulator 50 to fill the accumulator 50 with hydraulic fluid and accumulate pressure.
- first flow path 70a is connected to the head-side chamber 88 via the second flow path 70b.
- the hydraulic oil can be replenished to the second flow path 70b using the first flow path 70a.
- the sixth flow path 70f connects the hydraulic pump 46 and the head-side chamber 88 via the fourth flow path 70d.
- the sixth flow path 70f is a so-called pump line. Hydraulic oil can be supplied from the hydraulic pump 46 to the head-side chamber 88 using the sixth flow path 70f and the fourth flow path 70d.
- the fourth channel 70d is different from the first channel 70a.
- the sixth flow path 70f connects the hydraulic pump 46 and the rod side chamber 86 via the fifth flow path 70e. Hydraulic oil can be supplied from the hydraulic pump 46 to the rod side chamber 86 using the sixth flow path 70f and the fifth flow path 70e.
- the third flow path 70 c connects the rod side chamber 86 and the oil tank 48 . It is possible to recover hydraulic fluid discharged from the rod-side chamber 86 to the oil tank 48 using the third flow path 70c.
- the first flow path 70a to the sixth flow path 70f are composed of steel pipes or hoses, for example.
- the injection valve 54 is provided in the second flow path 70b.
- the injection valve 54 is provided between the head side chamber 88 and the accumulator 50 .
- the injection valve 54 allows or blocks the supply of hydraulic oil from the accumulator 50 to the head-side chamber 88 .
- the injection valve 54 is composed of, for example, a pilot-type check valve, and when the pilot pressure is not introduced, the hydraulic oil is allowed to flow from the accumulator 50 to the head-side chamber 88 and in the opposite direction. block the flow of When the pilot pressure is introduced to the injection valve 54, both flows are blocked.
- the injection valve 54 has a function of preventing backflow of hydraulic oil from the head-side chamber 88 to the accumulator 50 .
- the flow of hydraulic oil from the accumulator 50 to the head-side chamber 88 is allowed when the injection valve 54 is open. When the injection valve 54 is closed, the flow of hydraulic oil from the accumulator 50 to the head-side chamber 88 is blocked.
- the speed control valve 56 is provided in the third flow path 70c.
- the speed control valve 56 is provided between the rod side chamber 86 and the oil tank 48 .
- the speed control valve 56 controls the flow rate of hydraulic oil discharged from the rod-side chamber 86 to the oil tank 48 .
- the forward speed of the injection piston 82 is controlled by controlling the flow rate of hydraulic oil by the speed control valve 56 .
- a so-called meter-out control is performed by the speed control valve 56 .
- the speed control valve 56 When the speed control valve 56 is closed, the hydraulic fluid flow between the rod side chamber 86 and the oil tank 48 is blocked.
- the type of the speed control valve 56 is not particularly limited as long as the flow rate of hydraulic oil can be controlled.
- the speed control valve 56 may be, for example, a pressure-compensating valve or a non-pressure-compensating valve. Further, the speed control valve 56 may be, for example, a servo valve for which feedback control is performed, or a proportional valve for which open control is performed.
- the direction switching valve 58 is provided between the sixth flow path 70f and the fourth flow path 70d and between the sixth flow path 70f and the fifth flow path 70e.
- the direction switching valve 58 is provided between the head side chamber 88 and the hydraulic pump 46 and between the rod side chamber 86 and the hydraulic pump 46 .
- the direction switching valve 58 has a function of switching the flow path of hydraulic oil supplied from the hydraulic pump 46 through the sixth flow path 70f between the fourth flow path 70d and the fifth flow path 70e. .
- the direction switching valve 58 has a function of switching the supply destination of hydraulic oil supplied from the hydraulic pump 46 between the head side chamber 88 and the rod side chamber 86 .
- the injection piston 82 advances. Further, for example, by supplying hydraulic oil to the rod-side chamber 86, the injection piston 82 retreats.
- the type of direction switching valve 58 is not particularly limited as long as it can switch the direction of flow of hydraulic oil supplied from the hydraulic pump 46 .
- the direction switching valve 58 is, for example, an electromagnetic switching valve that uses an electromagnet to move the spool.
- the first open/close valve 60 is provided in the fourth flow path 70d.
- a first opening/closing valve 60 is provided between the head-side chamber 88 and the direction switching valve 58 .
- the first open/close valve 60 permits or blocks the flow of hydraulic oil between the direction switching valve 58 and the head side chamber 88 .
- first on-off valve 60 When the first on-off valve 60 is open, hydraulic fluid is permitted to flow between the direction switching valve 58 and the head-side chamber 88 . When the first open/close valve 60 is closed, the hydraulic fluid flow between the direction switching valve 58 and the head side chamber 88 is blocked.
- the type of the first opening/closing valve 60 is not particularly limited as long as it can allow and block the flow of hydraulic oil.
- the second open/close valve 62 is provided in the fifth flow path 70e.
- the second opening/closing valve 62 is provided between the rod side chamber 86 and the direction switching valve 58 .
- the second open/close valve 62 permits or blocks the flow of hydraulic oil between the direction switching valve 58 and the rod side chamber 86 .
- the type of the second opening/closing valve 62 is not particularly limited as long as it can allow and block the flow of hydraulic oil.
- the filling replenishment valve 64 is provided in the first flow path 70a.
- a filling replenishment valve 64 is provided between the accumulator 50 and the hydraulic pump 46 .
- a filling replenishment valve 64 is provided between the head-side chamber 88 and the hydraulic pump 46 .
- the filling replenishment valve 64 allows or blocks the flow of hydraulic oil between the accumulator 50 and the hydraulic pump 46, for example.
- the fill refill valve 64 allows or blocks hydraulic fluid flow between the head side chamber 88 and the hydraulic pump 46, for example.
- the type of filling replenishment valve 64 is not particularly limited as long as it can allow and block the flow of hydraulic oil.
- the position sensor 52 has a function of detecting the position of the rod 80.
- the position sensor 52 is, for example, an optical or magnetic linear encoder. By differentiating the position of the rod 80 detected by the position sensor 52, the speed of the rod 80 can be detected.
- the pressure sensor 53 has a function of measuring the pressure of hydraulic fluid in the head-side chamber 88.
- the controller 72 includes, for example, an injection cylinder 44, a hydraulic pump 46, an oil tank 48, an accumulator 50, an injection valve 54, a speed control valve 56, a direction switching valve 58, a first opening/closing valve 60, and a second opening/closing valve 62. , and the operation of the fill refill valve 64 .
- the controller 72 controls the discharge amount of hydraulic oil from the hydraulic pump 46 with the speed control valve 56 opened to a predetermined degree of opening. It has a function to change the amount of hydraulic oil supplied to 88 so as to increase continuously or stepwise.
- the controller 72 has a function of changing the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 . In other words, it has a function of changing the discharge amount per unit time of the hydraulic pump 46 .
- the controller 72 has a function of changing the amount of change in the discharge amount of the hydraulic pump 46 based on the pressure of the hydraulic oil in the head side chamber 88 measured by the pressure sensor 53, for example.
- the controller 72 has a function of reducing the amount of change in the amount of hydraulic fluid discharged from the hydraulic pump 46, for example, when the pressure of hydraulic fluid in the head side chamber 88 measured by the pressure sensor 53 reaches a predetermined pressure.
- the controller 72 has, for example, a function of controlling the supply of hydraulic oil to the head-side chamber 88 using the hydraulic pump 46 and the fourth flow path 70d.
- the controller 72 is, for example, a combination of hardware and software.
- the controller 72 includes, for example, a CPU, a semiconductor memory, and a control program stored in the semiconductor memory.
- the controller 72 is part of the control device 32, for example.
- FIG. 3 is an explanatory diagram of the control method of the molding machine of the first embodiment.
- the mold 18 is clamped using the mold clamping device 10 .
- the injection device 14 is used to inject and fill the cavity Ca in the clamped mold 18 with molten metal.
- the die cast product 99 is extruded and removed from the mold.
- the fixed mold 18a and the movable mold 18b are opened.
- the injection piston 82 By advancing the injection piston 82, the die cast product 99 is pushed out by the plunger 33 and removed from the fixed mold 18a. Thereafter, the die-cast product 99 is extruded using the extruder 12 and removed from the movable mold 18b.
- FIG. 4 is a timing chart.
- FIG. 4 shows the discharge amount of the hydraulic pump 46, the command to supply hydraulic fluid to the head side chamber 88, the command to discharge hydraulic fluid from the rod side chamber 86, the pressure of the hydraulic fluid in the sixth flow path 70f which is the pump line, the head The timing of the time change of the hydraulic oil pressure in the side chamber 88 is shown.
- FIG. 5 5, 6, and 7 are explanatory diagrams of the operation of the injection device 14 of the die casting machine 100.
- FIG. 5 is explanatory diagrams of the operation of the injection device 14 of the die casting machine 100.
- FIG. 5 is a diagram showing the state of the injection device 14 at time t0 in FIG.
- FIG. 5 shows the state of the injection device 14 after the molten metal in the cavity Ca within the mold 18 has solidified.
- the hydraulic pump 46 is in a stopped state.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- FIG. 6 is a diagram showing the state of the injection device 14 at time t1 in FIG.
- a command from the controller 72 causes the hydraulic pump 46 to operate.
- the discharge amount of hydraulic oil discharged from the hydraulic pump 46 changes so as to increase continuously.
- the discharge amount of hydraulic oil discharged from the hydraulic pump 46 changes so as to gradually increase.
- Hydraulic oil is supplied to the head-side chamber 88 according to a command from the controller 72 .
- the direction switching valve 58 operates so that the hydraulic oil supplied from the hydraulic pump 46 is supplied to the head side chamber 88 .
- a command from the controller 72 opens the speed control valve 56 to a predetermined degree of opening, making it possible to discharge hydraulic oil from the rod-side chamber 86 .
- a command from the controller 72 causes the first open/close valve 60 to open.
- the injection valve 54, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- White arrows indicate the flow of hydraulic oil.
- FIG. 7 is a diagram showing the state of the injection device 14 from time t2 to t4 in FIG.
- the head-side chamber 88 is filled with hydraulic fluid, and the pressure of the hydraulic fluid in the sixth flow path 70f, which is the pump line, and the pressure of the hydraulic fluid in the head-side chamber 88 begin to increase.
- the pressure of hydraulic fluid in the head-side chamber 88 is measured by a pressure sensor 53, for example.
- a command from the controller 72 causes the amount of hydraulic fluid discharged from the hydraulic pump 46 to increase. Reduce the amount of change. In other words, the discharge amount per unit time of the hydraulic pump 46 is reduced.
- a feedback control is performed in which the pressure of the hydraulic fluid in the head side chamber 88 measured by the pressure sensor 53 is fed back to the amount of change in the amount of hydraulic fluid discharged from the hydraulic pump 46 .
- an injection cylinder is also used to push out the die cast product from the mold.
- the injection piston By advancing the injection piston, the die cast product is pushed out by the plunger and removed from the mold.
- a pressure shock occurs when the injection piston suddenly protrudes. The occurrence of pressure shock can lead to damage to the die casting and damage to the structure of the die casting machine.
- FIG. 8 is an explanatory diagram of the control method of the molding machine of the comparative example of the first embodiment.
- FIG. 8 is a timing chart.
- the molding machine of the comparative example of the first embodiment has the same configuration as the die casting machine 100 of the first embodiment except for the controller 72.
- FIG. 8 shows the discharge amount of the hydraulic pump 46, the command to supply hydraulic fluid to the head side chamber 88, the command to discharge hydraulic fluid from the rod side chamber 86, the pressure of the hydraulic fluid in the sixth flow path 70f which is the pump line, the head The timing of the time change of the hydraulic oil pressure in the side chamber 88 is shown.
- FIG. 8 is a diagram corresponding to FIG.
- Hydraulic pump 46 is in a stopped state.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- the hydraulic pump 46 starts operating.
- the amount of hydraulic oil discharged from the hydraulic pump 46 is constant after time t1.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- the direction switching valve 58 and the first opening/closing valve 60 are closed, the pressure of the hydraulic fluid in the sixth flow path 70f, which is the pump line, rises with time.
- the direction switching valve 58 is operated by a command from the controller 72 so that the hydraulic oil supplied from the hydraulic pump 46 is supplied to the head side chamber 88 .
- the first open/close valve 60 is also opened by a command from the controller 72 .
- the speed control valve 56 is opened to a predetermined degree of opening by a command from the controller 72, and the hydraulic oil can be discharged from the rod-side chamber 86.
- the discharge amount of hydraulic oil discharged from the hydraulic pump 46 changes so as to continuously increase. In other words, the amount of hydraulic oil discharged from the hydraulic pump 46 changes gradually.
- feedback control is performed in which the pressure of the hydraulic fluid in the head side chamber 88 measured by the pressure sensor 53 is fed back to the amount of change in the amount of hydraulic fluid discharged from the hydraulic pump 46.
- FIG. 9 is an explanatory diagram of a control method for a molding machine according to a modification of the first embodiment.
- FIG. 9 is a timing chart.
- FIG. 9 is a diagram corresponding to FIG.
- the molding machine of the modified example of the first embodiment differs from the die casting machine 100 of the first embodiment in that feedback control is not performed. Since the molding machine of the modified example of the first embodiment does not perform feedback control, the structure of the injection device 14 is simplified.
- the injection piston 82 is suppressed from jumping out abruptly, and the generated pressure shock is reduced.
- an injection device, a molding machine, and a control method for a molding machine that can suppress sudden ejection of the piston, thereby suppressing damage to the molded product and damage to the structure of the die casting machine are provided. can.
- the injection apparatus of the second embodiment differs from the first embodiment in that the control unit changes the amount of change in the amount of hydraulic fluid discharged from the hydraulic pump based on the position of the rod or cylinder measured by the position sensor. It is different from the injection device of the form. In the following, a part of description may be omitted for contents that overlap with the first embodiment.
- the molding machine of the second embodiment differs from the molding machine of the first embodiment in that the injection device is different.
- the molding machine of the second embodiment is a die casting machine 200.
- the die casting machine 200 is, for example, a cold chamber type die casting machine.
- the die casting machine 200 includes a mold clamping device 10, an extrusion device 12, an injection device 15, a mold 18, and a control unit 20.
- FIG. 10 is a schematic diagram showing the configuration of the injection device of the second embodiment.
- the injection device 15 includes an injection cylinder 44, a hydraulic pump 46 (hydraulic pump), an oil tank 48, an accumulator 50, a position sensor 52, a pressure sensor 53, an injection valve 54, a speed control valve 56 (flow control valve), a direction Switching valve 58, first opening/closing valve 60, second opening/closing valve 62, filling/replenishing valve 64, first channel 70a, second channel 70b, third channel 70c, fourth channel 70d, a fifth flow path 70e, a sixth flow path 70f, and a controller 72 (control unit).
- the hydraulic pump 46 is an example of a hydraulic pump.
- the speed control valve 56 is an example of a flow control valve.
- Controller 72 is an example of a control unit.
- the injection cylinder 44 includes a rod 80 , an injection piston 82 (piston), a cylinder tube 84 , a rod side chamber 86 and a head side chamber 88 .
- the injection piston 82 is an example of a piston.
- the controller 72 includes, for example, an injection cylinder 44, a hydraulic pump 46, an oil tank 48, an accumulator 50, an injection valve 54, a speed control valve 56, a direction switching valve 58, a first opening/closing valve 60, and a second opening/closing valve 62. , and the operation of the fill refill valve 64 .
- the controller 72 controls the discharge amount of hydraulic oil from the hydraulic pump 46 with the speed control valve 56 opened to a predetermined degree of opening. It has a function to change the amount of hydraulic oil supplied to 88 so as to increase continuously or stepwise.
- the controller 72 has a function of changing the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 . In other words, it has a function of changing the discharge amount per unit time of the hydraulic pump 46 .
- the controller 72 has a function of changing the amount of change in the discharge amount of hydraulic oil from the hydraulic pump 46 based on the position of the rod 80 or the injection piston 82 measured by the position sensor 52, for example.
- the controller 72 changes the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 based on the speed of the rod 80 or the injection piston 82 calculated from the position of the rod 80 or the injection piston 82 measured by the position sensor 52, for example. It has a function to let
- FIG. 11 is an explanatory diagram of the control method of the molding machine of the second embodiment.
- the injection device 15 When performing maintenance on the die casting machine 200, the injection device 15 is used to move the plunger 33 inside the sleeve 31, as shown in FIG. At this time, no molten metal exists in the sleeve 31 . Also, there is no die-cast product in the mold 18 .
- FIG. 12 is an explanatory diagram of the control method of the molding machine of the second embodiment.
- FIG. 12 is a timing chart.
- FIG. 12 shows the discharge amount of the hydraulic pump 46, the command to supply hydraulic fluid to the head side chamber 88, the command to discharge hydraulic fluid from the rod side chamber 86, the pressure of the hydraulic fluid in the sixth flow path 70f which is the pump line, the rod 80 shows the timing of the speed change over time.
- Hydraulic pump 46 is in a stopped state.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/replenishing valve 64 are closed.
- a command from the controller 72 causes the hydraulic pump 46 to start operating.
- the discharge amount of hydraulic oil discharged from the hydraulic pump 46 changes so as to increase continuously.
- Hydraulic oil is supplied to the head-side chamber 88 according to a command from the controller 72 .
- the direction switching valve 58 operates so that the hydraulic oil supplied from the hydraulic pump 46 is supplied to the head side chamber 88 .
- a command from the controller 72 opens the speed control valve 56 to a predetermined degree of opening, making it possible to discharge hydraulic oil from the rod-side chamber 86 .
- a command from the controller 72 causes the first open/close valve 60 to open.
- the injection valve 54, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- the head-side chamber 88 is filled with hydraulic fluid, and the pressure of hydraulic fluid in the sixth flow path 70f, which is the pump line, begins to increase.
- the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 is changed.
- the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 is changed based on the speed of the rod 80 calculated from the position of the rod 80 measured by the position sensor 52 .
- a command from the controller 72 increases the amount of change in the amount of hydraulic fluid discharged from the hydraulic pump 46 .
- the discharge amount per unit time of the hydraulic pump 46 is increased.
- a feedback control is performed in which the speed of the rod 80 calculated from the rod 80 measured by the position sensor 52 is fed back to the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 .
- injection cylinders are used during die casting machine maintenance.
- an injection cylinder is used to move the plunger within the sleeve.
- the plunger inside the sleeve is moved, if the injection piston suddenly protrudes, the accuracy of the position control of the plunger is degraded. For example, the inching accuracy of the plunger is degraded.
- FIG. 13 is an explanatory diagram of a control method of a molding machine of a comparative example of the second embodiment.
- FIG. 13 is a timing chart.
- the molding machine of the comparative example of the second embodiment has the same configuration as the die casting machine 200 of the second embodiment except for the controller 72.
- FIG. 13 shows the discharge amount of the hydraulic pump 46, the command to supply hydraulic fluid to the head side chamber 88, the command to discharge hydraulic fluid from the rod side chamber 86, the pressure of the hydraulic fluid in the sixth flow path 70f which is the pump line, the rod 80 shows the timing of the speed change over time.
- FIG. 13 is a diagram corresponding to FIG.
- the injection piston 82 and plunger 33 are stationary.
- the hydraulic pump 46 is stopped.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/refilling valve 64 are closed.
- the hydraulic pump 46 is activated.
- the amount of hydraulic oil discharged from the hydraulic pump 46 is constant.
- the injection valve 54, the speed control valve 56 (flow rate control valve), the direction switching valve 58, the first opening/closing valve 60, the second opening/closing valve 62, and the filling/refilling valve 64 are closed. . Since the direction switching valve 58 and the first opening/closing valve 60 are closed, the pressure of the hydraulic fluid in the sixth flow path 70f, which is the pump line, rises with time.
- the direction switching valve 58 is operated by a command from the controller 72 so that the hydraulic oil supplied from the hydraulic pump 46 is supplied to the head side chamber 88 . Also, the first open/close valve 60 is opened. Further, the speed control valve 56 is opened to a predetermined degree of opening by a command from the controller 72, and the hydraulic oil can be discharged from the rod-side chamber 86.
- the discharge amount of hydraulic oil discharged from the hydraulic pump 46 changes so as to continuously increase. In other words, the amount of hydraulic oil discharged from the hydraulic pump 46 changes gradually.
- the accuracy of position control of the plunger 33 is improved.
- the inching accuracy of the plunger 33 is improved.
- the speed of the rod 80 calculated from the position of the rod 80 measured by the position sensor 52 is used as the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46. It is preferable to perform feedback control that feeds back to changes. For example, when the speed of the rod 80 reaches a predetermined speed Vx, it is preferable to increase the amount of change in the amount of hydraulic oil discharged from the hydraulic pump 46 according to a command from the controller 72 .
- FIG. 14 is an explanatory diagram of a control method for a molding machine according to a modification of the second embodiment.
- FIG. 14 is a timing chart.
- FIG. 14 is a diagram corresponding to FIG.
- the molding machine of the modified example of the second embodiment differs from the die casting machine 200 of the second embodiment in that feedback control is not performed. Since the molding machine of the modified example of the second embodiment does not perform feedback control, the structure of the injection device 15 is simplified.
- the second embodiment it is possible to provide an injection device, a molding machine, and a control method for the molding machine that can suppress sudden ejection of the piston and improve the accuracy of the plunger position control.
- a die-casting machine that fills a mold with molten metal has been described as an example of a molding machine.
- the present invention can also be applied to an injection molding machine that fills a mold with a resin material. It is possible.
- control section of the injection device it is also possible to configure the control section of the injection device to have the functions of both the control sections of the first and second embodiments.
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Abstract
Description
第1の実施形態の射出装置は、スリーブの中を摺動するプランジャに連結可能なロッドと、ロッドに固定されるピストンと、ピストンを摺動可能に収容するシリンダチューブと、ロッドが配置されるロッド側室と、ピストンを間に挟んでロッド側室の反対側に位置するヘッド側室と、を含む射出シリンダと、液圧ポンプと、ロッド側室から排出される作動液の流量を制御する流量制御バルブと、ピストンをロッド側に前進させる際に、流量制御バルブを開いた状態で、液圧ポンプの作動液の吐出量を制御し、ヘッド側室への作動液の供給量が連続的又は段階的に増加するように変化させる制御部と、を備える。
第2の実施形態の射出装置は、制御部は、位置センサで測定されるロッド又はシリンダの位置に基づき、液圧ポンプの作動液の吐出量の変化量を変化させる点で、第1の実施形態の射出装置と異なる。以下、第1の実施形態と重複する内容については、一部記述を省略する場合がある。
12 押出装置
14 射出装置
15 射出装置
18 金型
31 スリーブ
33 プランジャ
44 射出シリンダ
46 油圧ポンプ(液圧ポンプ)
50 アキュムレータ
52 位置センサ
53 圧力センサ
56 速度制御用バルブ(流量制御バルブ)
70a 第1の流路
70b 第2の流路
70c 第3の流路
70d 第4の流路
72 コントローラ(制御部)
80 ロッド
82 射出ピストン(ピストン)
84 シリンダチューブ
86 ロッド側室
88 ヘッド側室
99 ダイカスト品(成形品)
100 ダイカストマシン
200 ダイカストマシン
Ca 空洞
Claims (15)
- スリーブの中を摺動するプランジャに連結可能なロッドと、
前記ロッドに固定されるピストンと、
前記ピストンを摺動可能に収容するシリンダチューブと、
前記ロッドが配置されるロッド側室と、
前記ピストンを間に挟んで前記ロッド側室の反対側に位置するヘッド側室と、
を含む射出シリンダと、
作動液の吐出量が可変な液圧ポンプと、
前記ロッド側室から排出される前記作動液の流量を制御する流量制御バルブと、
前記ピストンを前記ロッド側に前進させる際に、前記流量制御バルブを開いた状態で、前記液圧ポンプの前記作動液の吐出量を制御し、前記ヘッド側室への前記作動液の供給量が連続的又は段階的に増加するように変化させる制御部と、
を備えることを特徴とする射出装置。 - 前記制御部は、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項1記載の射出装置。
- 前記ヘッド側室の前記作動液の圧力を測定する圧力センサを更に、備え、
前記制御部は、前記圧力センサで測定される前記ヘッド側室の前記作動液の圧力に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項2記載の射出装置。 - 前記制御部は、前記圧力センサで測定される前記ヘッド側室の前記作動液の圧力が所定の圧力に達した場合に、前記液圧ポンプの前記作動液の吐出量の変化量を低減させることを特徴とする請求項3記載の射出装置。
- 前記ロッド又は前記ピストンの位置を測定する位置センサを更に、備え、
前記制御部は、前記位置センサで測定される前記ロッド又は前記ピストンの位置に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項2記載の射出装置。 - 前記制御部は、前記位置センサで測定される前記ロッド又は前記ピストンの位置から算出される前記ロッド又は前記ピストンの速度に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項5記載の射出装置。
- 前記ヘッド側室に供給される前記作動液の流量を大きくするためのアキュムレータと、
前記液圧ポンプを用いて前記アキュムレータに前記作動液を供給する第1の流路と、
前記アキュムレータを用いて前記ヘッド側室に前記作動液を供給する第2の流路と、
前記ロッド側室から前記作動液を排出し、前記流量制御バルブを有する第3の流路と、
前記液圧ポンプを用いて前記ヘッド側室に前記作動液を供給し、前記第1の流路と異なる第4の流路と、を更に備え、
前記制御部は、前記液圧ポンプ及び前記第4の流路を用いて前記ヘッド側室への前記作動液の供給を行うことを特徴とする請求項1ないし請求項6いずれか一項記載の射出装置。 - 請求項1ないし請求項7いずれか一項記載の射出装置と、
金型を型締めする型締装置と、
前記金型から成形品を押し出す押出装置と、を備え、
前記射出装置は、前記金型の中に液状材料を射出することを特徴とする成形機。 - 金型を型締めする型締装置と、
前記金型から成形品を押し出す押出装置と、
スリーブの中を摺動するプランジャに連結可能なロッドと、
前記ロッドに固定されるピストンと、
前記ピストンを摺動可能に収容するシリンダチューブと、
前記ロッドが配置されるロッド側室と、
前記ピストンを間に挟んで前記ロッド側室の反対側に位置するヘッド側室と、
を含む射出シリンダと、
作動液の吐出量が可変な液圧ポンプと、
前記ロッド側室から排出される前記作動液の流量を制御する流量制御バルブと、
を含み、前記金型の中に前記プランジャを用いて液状材料を射出する射出装置と、
を備える成形機の制御方法であって、
前記ピストンを前記ロッド側に前進させる際に、前記流量制御バルブを開いた状態で、前記液圧ポンプの前記作動液の吐出量を制御し、前記ヘッド側室への前記作動液の供給量が連続的又は段階的に増加するように変化させることを特徴とする成形機の制御方法。 - 前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項9記載の成形機の制御方法。
- 前記射出装置は、前記ヘッド側室の前記作動液の圧力を測定する圧力センサを更に、含み、
前記圧力センサで測定される前記ヘッド側室の前記作動液の圧力に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項10記載の成形機の制御方法。 - 前記圧力センサで測定される前記ヘッド側室の前記作動液の圧力が所定の圧力に達した場合に、前記液圧ポンプの前記作動液の吐出量の変化量を低減させることを特徴とする請求項11記載の成形機の制御方法。
- 前記ピストンを前記ロッド側に前進させることにより、前記金型の中に形成された成形品を押し出すことを特徴とする請求項10又は請求項11記載の成形機の制御方法。
- 前記射出装置は、前記ロッド又は前記ピストンの位置を測定する位置センサを更に、備え、
前記位置センサで測定される前記ロッド又は前記ピストンの位置に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項10記載の成形機の制御方法。 - 前記位置センサで測定される前記ロッド又は前記ピストンの位置から算出される前記ロッド又は前記ピストンの速度に基づき、前記液圧ポンプの前記作動液の吐出量の変化量を変化させることを特徴とする請求項14記載の成形機の制御方法。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0390315A (ja) * | 1989-09-04 | 1991-04-16 | Sumitomo Heavy Ind Ltd | 型締制御装置 |
JP2000202610A (ja) * | 1999-01-11 | 2000-07-25 | Japan Steel Works Ltd:The | 金属射出成形機の射出方法及びその装置 |
JP2003071896A (ja) * | 2001-09-04 | 2003-03-12 | Sumitomo Heavy Ind Ltd | 成形機の型締装置及び方法 |
JP2006256180A (ja) * | 2005-03-18 | 2006-09-28 | Ube Machinery Corporation Ltd | 射出成形機におけるトグル式型締装置及び型開制御方法 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0390315A (ja) * | 1989-09-04 | 1991-04-16 | Sumitomo Heavy Ind Ltd | 型締制御装置 |
JP2000202610A (ja) * | 1999-01-11 | 2000-07-25 | Japan Steel Works Ltd:The | 金属射出成形機の射出方法及びその装置 |
JP2003071896A (ja) * | 2001-09-04 | 2003-03-12 | Sumitomo Heavy Ind Ltd | 成形機の型締装置及び方法 |
JP2006256180A (ja) * | 2005-03-18 | 2006-09-28 | Ube Machinery Corporation Ltd | 射出成形機におけるトグル式型締装置及び型開制御方法 |
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