WO2023228390A1 - ダイカスト製造方法及び装置 - Google Patents

ダイカスト製造方法及び装置 Download PDF

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Publication number
WO2023228390A1
WO2023228390A1 PCT/JP2022/021657 JP2022021657W WO2023228390A1 WO 2023228390 A1 WO2023228390 A1 WO 2023228390A1 JP 2022021657 W JP2022021657 W JP 2022021657W WO 2023228390 A1 WO2023228390 A1 WO 2023228390A1
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WO
WIPO (PCT)
Prior art keywords
die
pressurizing
product
biscuit
pressure
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Application number
PCT/JP2022/021657
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English (en)
French (fr)
Japanese (ja)
Inventor
典裕 岩本
理 長澤
圭司 谷口
繁明 斎藤
Original Assignee
株式会社ダイレクト２１
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.)
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Application filed by 株式会社ダイレクト２１ filed Critical 株式会社ダイレクト２１
Priority to PCT/JP2022/021657 priority Critical patent/WO2023228390A1/ja
Priority to JP2024522857A priority patent/JPWO2023228390A1/ja
Publication of WO2023228390A1 publication Critical patent/WO2023228390A1/ja

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    • 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
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/04—Handling or stripping castings or ingots

Definitions

  • the present invention relates to a die casting manufacturing method and apparatus, and particularly to a die casting manufacturing method and apparatus that can shorten product manufacturing cycles.
  • the method for casting die-cast products is to push molten metal such as aluminum into a cavity made in a mold using a plunger, and then take out a product shaped like the cavity.
  • a method has been proposed in which the runner is further pressurized in conjunction with the pressurizing operation of the plunger of the die-casting machine. This is done by installing a pressure pin that goes in and out of the rising runner that is directly connected to the cavity, and after the plunger is pressurized by the primary pressure means, the pressure pin of the runner is activated to apply further pressure. (Patent Document 1).
  • the product is taken out by a robot that grasps the biscuit part connected to the product part and automatically takes out the entire as-cast product consisting of the biscuit part, runner part, product part, and air vent part.
  • a robot grasps the biscuit part connected to the product part and automatically takes out the entire as-cast product consisting of the biscuit part, runner part, product part, and air vent part.
  • the pressurizing part and the biscuit surface at the tip of the plunger are connected, which has the drawback that the molten metal flows back toward the plunger, making it impossible to exert the rising water effect. Ta.
  • Patent Document 2 the technology listed in Patent Document 2 has been proposed, which maintains the strength of the runner part that connects the product part and the biscuit part, while reducing the inner diameter of the member forming the rising runner part and the pressure pin.
  • the gap between the outside diameter and the outside diameter is set to 0.5 to 3.0 mm to exhibit a backflow prevention function and to obtain a pushing effect (Patent Document 2).
  • Patent Document 2 the gap between the inner diameter of the member forming the rising runner portion and the outer diameter of the pressure pin is set to 0.5 to 3.0 mm, in reality, it is difficult to form such a cylindrical gap. This is difficult, the gap becomes large, and a certain gap length L is also required. For this reason, even if the pressure pin was inserted under pressure, the molten metal would flow back through the gap ⁇ , pushing the plunger back, and the expected backflow prevention effect could not be obtained.
  • the die-cast product is removed after casting by gripping the biscuit part with a robot chuck.
  • the product part and biscuit part of the cast product solidified by pressing a pressure pin into a cylinder that has been processed and installed in the runner part have a thin cylindrical shape formed by the gap between the inner diameter of the cylinder and the outer diameter of the pressure pin. It becomes connected. Therefore, when the gap between the cylinder part of the rising runner part and the pressure pin of the moving runner part becomes thin, the strength of the part connecting the biscuit part and the product part decreases, causing damage when taking out the product and failure to take out the product. Continuous production will be disrupted.
  • the manufacturing cycle time for die-cast products consists of mold clamping, molten metal filling, injection into the mold, cooling, mold opening, removal of the as-cast product, mold release agent injection, and mold clamping.
  • cooling time accounts for a large proportion, and is determined by the cooling time of the thick biscuit part, which takes the longest time to cool, and there is a limit to the reduction of product manufacturing cycle time.
  • the present invention has focused on the above-mentioned problems, and provides a die-cast manufacturing method and apparatus that can shorten the manufacturing cycle by allowing the product to be taken out after the cooling of the die-cast product without waiting for the cooling of the biscuit part.
  • the purpose is to provide.
  • a die casting manufacturing method in which, after injecting molten metal into a clamped mold by a first pressure means, a second pressure is applied by a second pressure means through a runner directly connected to a cavity, the method comprising: The method is characterized in that when the cavity is completely filled with molten metal, the passage between the die-cast product part and the biscuit part is separated, and the die-cast product part is pressurized by the second pressurizing means.
  • the pressurizing pin of the second pressurizing means separates the passage between the die-cast product part and the biscuit part, and the pressurizing pin
  • the die-cast product is pressurized by the pressing force of .
  • the die-cast product part is solidified and the biscuit part is opened in a half-baked state, and the product or the ejecting protrusion connected to the product is grasped by a product take-out device, and the biscuit part is in a semi-baked state.
  • the biscuit portion may be separated by extrusion from a machine die or by forward motion of injection. Furthermore, the quality of the product is confirmed during casting by monitoring the stroke of the pressure pin.
  • the structure is such that the pressure applied to the molten metal including the die-cast product part by the pressure pin of the second pressure means is greater than the pressure applied to the molten metal by the first pressure means.
  • the pressure of the second pressurizing means is applied. It is characterized by applying pressure using a pin so as to separate the die-cast product part and the biscuit part at the runner part that connects them.
  • the die casting manufacturing apparatus includes a first pressurizing means for injecting molten metal into a clamped mold, and a pressurizing means that is operated after the operation of the first pressurizing means is completed and pressurizes a runner directly connected to the cavity.
  • a second pressurizing means provided with a pin, and a dividing means provided at a position to separate and shield the die-cast product part and the biscuit part, and the dividing means presses the die-cast product part after the operation of the first pressurizing means is completed.
  • the present invention is characterized in that it is provided with a control section that allows the die-cast product section and the biscuit section to be separated so that the die-cast product section and the biscuit section can be separated, and then the die-cast product section can be pressurized by the second pressurizing means.
  • the second pressurizing means includes a first pressurizing means for injecting molten metal into the clamped mold, and a pressurizing pin that is operated after the operation of the first pressurizing means is completed and pressurizes a runner directly connected to the cavity.
  • a pressure means and a pressure path for the pressure pin provided at a position separating the die-cast product part and the biscuit part are provided, and the pressure path separates the die-cast product part and the biscuit part by the operation of the pressure pin.
  • the present invention is characterized in that it is provided with a control section that is separable so that the product section and the biscuit section can be separated, and then the die-cast product section can be pressurized by the second pressurizing means.
  • control unit after pressurizing the product part by the second pressurizing means, causes the die-cast product part to be solidified and the biscuit part to open the mold in a semi-baked state, and to move the product or the runner connected to the product to the product part.
  • the biscuit portion which is in a semi-baked state after being grasped by a take-out device, is separated by extrusion from a mold or by forward motion of the injection machine.
  • a first pressurizing means for injecting the molten metal into the die-casting mold, and a second pressurizing means for bending the runner communicating with the cavity and applying pressure in the direction of the cavity, which is provided on the runner directly connected to the cavity at this bent part.
  • an injection section is provided in the pressurizing path by the pressurizing pin of the second pressurizing means to separate and shield the die-cast product part and the biscuit part between the pressurizing pin and the pressurizing pin.
  • the present invention is characterized in that a control unit is provided that allows the pressure pin to pressurize the product portion after the pressure is applied.
  • the control section opens the die-cast product part in a solidified state and the biscuit part is in a semi-baked state, and the product or the runner connected to the product is moved by a product take-out device.
  • the biscuit parts in a semi-baked state are separated by extruding the machine with a die or by forward movement of the injection machine.
  • the timing for taking out the "as-cast product” consisting of the biscuit part, runner part, product part, and air vent part after injecting the molten metal into the mold is when the entire "as-cast product" has solidified. I went there after that.
  • the solidification speed is determined by the biscuit and runner parts. Varies depending on product section and air vent section.
  • the solidification rate is proportional to the square of the wall thickness. As an example, if the product thickness is 3 mm, the cooling time of the product part will be 3 mm ⁇ approximately 0.09 seconds, and if the biscuit part is 30 mm, the cooling time of the product part will be 30 mm ⁇ 9 seconds. In most cases, the thick-walled biscuit section solidifies the slowest, and the solidification rate of the biscuit section determines the cycle time, or productivity, of die-cast product manufacturing.
  • the product part and the biscuit are separated by a runner pressure pin that is pushed into the runner part, so that the mold is opened when only the product part has solidified, without waiting for the long solidification time of the biscuit part.
  • cycle time can be shortened and productivity in die-cast product manufacturing can be improved.
  • the thickness of the product part is 3 mm and the thickness of the biscuit part is 30 mm
  • the time to take out the "as-cast product” will be shortened from 9 seconds to 0.09 seconds, which will significantly shorten the cycle time.
  • Productivity can be improved.
  • the product can be taken out in a state where the solidification state is less advanced than before, product deformation and galling during removal can be reduced.
  • the gap formed by the diameter of the runner part and the diameter of the runner pressurizing pin is made to have a wall thickness below which the biscuit part falls under its own weight.
  • the gap of the same degree is a gap that prevents the molten metal from flowing back when the runner is pressurized. Since there is no backflow, the molten metal is forced into the product part already filled by the first pressurizing means at high pressure by the second pressurizing pin using the runner pressurizing pin.
  • the molten metal in the product part before solidification can be removed. It can be pressed and effectively increase the density.
  • the amount of molten metal pushed can be measured, making it possible to check the quality of the product during casting.
  • FIG. 1 is a cross-sectional view of a main part of a die-casting manufacturing apparatus according to an example.
  • FIG. 3 is a cross-sectional view of a pressure pin attachment used in a die-casting manufacturing apparatus, and a cross-sectional view of a modified example. It is an explanatory view of opening the mold of the same device and taking out a die-cast product and a biscuit part separately.
  • FIG. 2 is a configuration diagram of a pin stroke detection device.
  • FIG. 3 is a cross-sectional view of runner pressurization using the center gate manufacturing method.
  • FIG. 1 shows a cross-sectional view of the main parts of a die-casting manufacturing apparatus according to a first embodiment.
  • the die casting manufacturing apparatus 10 includes a movable die 14 attached to a movable platen 12 and a fixed die 18 attached to a fixed platen 16.
  • the molten metal is injected, and a product shaped like the cavity 20 is completed.
  • the die-cast product can be taken out from the cavity 20 by separating the molds 14 and 18 and activating the push-out pin 22 provided on the back side of the movable mold 14.
  • a hot water supply means 24 is disposed below the cavity 20 as an injection part for supplying molten metal to the cavity 20 of the die casting manufacturing apparatus 10.
  • This includes an injection sleeve 26 that is installed horizontally through the fixed platen 16 and reaches the fixed mold 18, a plunger 28 disposed inside the injection sleeve 26, and a plunger 28 located behind the plunger 28. It is composed of a pressurizing device capable of pushing and pulling, and a first pressurizing means 30.
  • a runner 32 is formed at the front end of the injection sleeve 26 and serves as a path for the molten metal to reach the cavity 20 via the biscuit 31. It consists of a rising runner part 36 that is oriented upward so as to be directly connected to the lower part of the cavity 20, and the molten metal pushed out by the plunger 28 of the first pressurizing means 22 passes through the separator runner part 34, It is configured to change direction upward by the rising runner section 36 and inject into the cavity 20.
  • the rising runner portion 36 of such a runner 32 is provided with a second pressurizing means 38 that secondarily pressurizes the molten metal within the cavity 20.
  • This second pressurizing means 38 includes an actuator (hydraulic cylinder) 40 installed at the bottom of the molds 14 and 18, and a pressurizing pin attached to move in and out from the bottom to the top of the rising runner section 36. It consists of 42.
  • the diameter d of the pressure pin 42 is made smaller than the inner diameter D of the rising runner part 36, but by making it approximately the same diameter, it is possible to divide and shield the molten metal while allowing the pressure pin 42 to slide up and down in the rising runner part 34. That's what I do. Therefore, the amount of press-fitting of the press pin 42 into the rising runner portion 36 improves the density of the product produced by the cavity 20.
  • the pressurizing pin is placed in the straight path from the intersection of the rising runner section 36 and the shunt runner section 34 (A-B section in FIG. 2(1)) to the gate of the rising runner section 36 above.
  • D the inner diameter D of the area (A-C section in FIG. 2 (1)) up to the stroke end (C in FIG. 2 (1)) of the pressure pin 42
  • D d + 0.1 mm. ⁇ d+0.5mm.
  • D d+0.2 mm to d+0.4 mm. This is to ensure the movable range of the pressure pin 42 and to prevent molten metal from entering the gap.
  • the second pressurizing means 38 configured in this way starts pressurizing from the position shown in FIG. As shown in FIG. 3, when the pressure pin 42 just blocks the diverter runner portion 34, the product portion 35 and the biscuit portion 31 are separated from each other at that portion. Therefore, when the state shown in FIG. 2(1)C is reached by pushing the pressure pin 42, the amount of molten metal filled into the cavity 20 increases, the stroke of the pressure pin 42 becomes longer, and the manufacturing process is completed.
  • the die-cast product part 35 and the biscuit 31 in the cavity 20 are completely separated, so the molds 14 and 18 are opened during the solidification time of the die-cast product part 35, and the biscuit Even if the part 31 is still at a high temperature and has not completely cooled down, the die-cast product 35 can be taken out by the chuck robot 41 and the divided biscuit part 31 side can be dropped by its own weight.
  • These drive controls may be performed by a separately provided control section.
  • the product part and the biscuit part 31 are separated by the runner pressurizing pin 42 pushed into the runner part, so that the product part can be melted when only the product part has solidified, without waiting for the solidification time of the biscuit part 31, which takes a long time. Since the molds 14 and 18 can be opened and the product parts can be taken out, cycle time can be shortened and productivity in manufacturing die-cast products can be improved. When the product part thickness is 3 mm and the biscuit part 31 is 30 mm, the time to take out the "as-cast product" is reduced from 9 seconds to 0.09 seconds, and the cycle time is shortened and productivity is improved. can be improved. Furthermore, since the product can be taken out in a state where the solidification state is less advanced than before, product deformation and galling during removal can be reduced.
  • the runner part In order to separate the product part and the biscuit part 31 at the runner part 31 using the runner pressure pin 42 that pushes the runner part 31, when the molds 14 and 18 are opened, the runner part is cut by the weight of the biscuit part 31 and the biscuit part is separated. 31 must fall.
  • the gap formed by the diameter of the runner section 31 and the diameter of the runner pressurizing pin 42 is made to have a wall thickness below which the biscuit section 31 falls under its own weight.
  • the gap of the same degree is a gap that prevents the molten metal from flowing back when the runner is pressurized.
  • the molten metal is forced into the product part already filled by the first pressurizing means 24 at high pressure by the second pressurization by the runner pressurizing pin 42.
  • the molten metal in the product part before solidification is can be pushed in, effectively increasing the density.
  • the die-casting product time can be used as cycle time and is no longer dependent on biscuit cooling time. Furthermore, since it is not necessary to hold the biscuit 31 when taking out the die-cast product, deformation of the product and galling when taking out the product do not occur.
  • the runner pressure pin can be used to separate the die-cast product and the biscuit part, and the center part of the product can be pressurized while it is not solidified. It is possible to indent at a higher casting pressure (approximately 70 MPa ⁇ approximately 280 MPa) while maintaining the same pressure (approximately 70 MPa ⁇ approximately 280 MPa), and the internal density can be significantly increased.
  • FIG. 2(2) shows a modification of the pressure pin 42.
  • This is provided with an annular projection 43 having a diameter D at the entrance of the rising runner section 36.
  • D d+0.2 mm to d+0.4 mm.
  • the diameter E of the rising runner 36 may be larger than D, and the dimensions may be rough.
  • FIG. 4 is a configuration diagram of the pin stroke detection device. As shown in the figure, the piston drive amount of the main actuator 40 and, in turn, the stroke of the pressure pin 42 are measured from the amount of discharged oil in the hydraulic discharge path 44 when the pressure pin 42 is raised.
  • the stroke detection device 46 has a cylinder-piston structure, which includes a cylinder body 48 and a piston 50 that can slide inside the cylinder body 48.
  • One chamber defined by the piston 50 of the cylinder body 48 is connected to the hydraulic oil outlet of the pressurizing pin 42, and the other chamber is connected to the direction switching valve 52.
  • a rod 54 is integrally provided on the piston 50, and this rod 54 protrudes from one end of the cylinder body 48 and is connected to a linear potentiometer 56.
  • the starting point of the rod 54 is at one end of the cylinder body 48 (the left end in FIG. 3), which coincides with the pressure starting point of the pressure pin 42 (the lower end in FIG. 3).
  • a linear potentiometer 56 is arranged parallel to the rod 54, moves together with the rod 54, and determines the distance traveled by the rod 54.
  • the piston 50 is provided with a through hole that communicates between the chambers partitioned by the piston 50, and a check valve 58 and an orifice (throttle valve) 60 are attached to this through hole.
  • the check valve 58 is a one-way valve that blocks the flow of hydraulic oil pushed out from the chamber of the pressure pin 42 into the chamber on the direction switching valve 52 side, and allows the flow in the opposite direction. Ru.
  • the stroke detection device 46 detects the total amount of hydraulic fluid when the pressure pin 42 performs the pressurizing operation.
  • An orifice (throttle valve) 59 regulates the flow rate of the check valve 58 . Furthermore, if the cracking pressure (spring force) of the check valve 58 is weak, the fluid will flow through the check valve while the piston is stopped, so this can be solved by restricting the flow rate. Note that a control means for controlling the above-mentioned operating system is separately provided, and is controlled to operate properly.
  • the pressure pin By providing such a stroke detection device 46 for the pressure pin 42, the pressure pin can be accurately monitored, and the amount of secondary pressurization of the die-cast product can be measured just by this operation.
  • FIG. 5 shows an example of application to the "center gate manufacturing method".
  • the "center gate manufacturing method” is applied to circular/conical shaped parts and point-symmetric parts, and is used by filling the molten metal from the center of the cavity 66 in order to improve the filling balance.
  • the apparatus for implementing this center gate manufacturing method includes a second movable mold 64 provided between a fixed mold 60 and a movable mold 62, and a movable mold (hereinafter referred to as a first movable mold). ) 62 and the second movable mold 64, and a spool 70 connecting the cavity 66 and the runner 68 is formed in the second movable mold 64.
  • the spool 70 is formed into a conical shape, and the apex is located at the center of the circular cavity 66. By supplying the molten metal from the apex, the molten metal is distributed throughout the cavity 66 through the spool 70.
  • the runner 68 is formed on the mold matching surface of the fixed mold 60 and extends downward at right angles from the apex of the spool 70, and is connected to the plunger sleeve 72 provided below the fixed mold 60 and extending horizontally. It is familiar to A plunger 74 is inserted into the plunger sleeve 72, and an actuator (not shown) applies primary pressure to inject the molten metal. Pressurizing means including this plunger 74 is first pressurizing means 76 .
  • a second pressurizing means 80 is provided on the fixed mold 60 side opposite to the apex of the spool 70.
  • This consists of a pressure cylinder 82 and a pressure pin 84 that moves in and out from the pressure cylinder 82, and is configured so that the pressure pin 84 moves in and out toward the top of the spool 70 formed in the second movable mold 64.
  • a bending passage 86 provided at a location connecting the runner 68 and the spool 70 is used as an entry/exit passage for the pressure pin 84, and this is the second movable passage. It is formed inside the mold 64 and serves as a passageway connected to the cavity 66.
  • Pressure pin 84 traverses runner 68 and pressurizes cavity 66 once it reaches bent passage 86 .
  • D d+0.2 mm to d+0.4 mm. This is to ensure the movable range of the pressure pin 84 and to prevent molten metal from entering the gap.
  • the amount of push by the pressure pin 84 is the amount of pressure applied to the cavity 66.
  • the first pressurizing means 76, the gate cutting hydraulic cylinder 78, and the second pressurizing means 80 are also in a standby state. Molten metal is poured from the pouring port of the plunger sleeve 72. Thereafter, when pouring is completed, the first pressurizing means 76 is started to move at high speed, and injection is completed at low speed and high pressure at the forward limit. Molten aluminum enters runner 68 and rises through curved passageway 86 and from spool 70 to fill cavity 66 . Thereafter, after the injection operation by the first pressurizing means 76 is completed, secondary pressurizing by the second pressurizing means 80 is performed.
  • the die-cast product part and the biscuit part 31 are separated, so that the biscuit can be easily taken out.
  • the first movable mold 62 is further moved backward, the space between the intermediate second movable mold 64 and the first movable mold 62 is expanded, and the product is taken out from the cavity 66.
  • the pressure pin 84 of the second pressure means 80 that pressurizes the spool 70 located in the center of the cavity 66 blocks the bending passage 86 leading to the product part, The pressure is maintained by completely blocking the backflow of the molten metal, making it possible to apply additional pressure to the product section. Consequently, it is no longer necessary to place the second pressurizing means 80 below the runner 68, and the second pressurizing means 80 does not get in the way.
  • the effects of the present invention can be sufficiently obtained by the center gate manufacturing method. That is, according to this embodiment, there is no need to first place a hydraulic cylinder for gate cutting. Even if it is placed, it is sufficient to simply peel off the runner portion from the second movable mold 64. Since the die-cast product part and the biscuit part 31 are separated, the cycle can be set up in the time it takes for the die-cast product part to cool and solidify, and the biscuit part 31 does not need to be completely cooled during heating, so This means that manufacturing cycle time can be significantly reduced.
  • the first pressurizing means is used to inject the molten metal.
  • the die-cast product part and the biscuit part can be separated and pressurized by the second pressurizing means, thereby shortening the product manufacturing cycle time.

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  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
PCT/JP2022/021657 2022-05-26 2022-05-26 ダイカスト製造方法及び装置 WO2023228390A1 (ja)

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PCT/JP2022/021657 WO2023228390A1 (ja) 2022-05-26 2022-05-26 ダイカスト製造方法及び装置
JP2024522857A JPWO2023228390A1 (enrdf_load_stackoverflow) 2022-05-26 2022-05-26

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Cited By (1)

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CN117943524A (zh) * 2024-03-27 2024-04-30 德州市鲁冠制动元件股份有限公司 一种汽车刹车片加工用的压铸成型装置

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JP2002224811A (ja) * 2001-02-02 2002-08-13 Toshiba Mach Co Ltd ダイカストマシンシステムおよびその製品搬出方法
JP2007061854A (ja) * 2005-08-31 2007-03-15 Yutaka Electronics Industry Co Ltd ダイカスト成型装置及びダイカスト成型方法
JP2011224650A (ja) * 2010-03-30 2011-11-10 Ryobi Ltd ダイカスト用装置及びダイカスト法
WO2015151369A1 (ja) * 2014-03-31 2015-10-08 アイシン軽金属株式会社 アルミニウム合金及びダイカスト鋳造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117943524A (zh) * 2024-03-27 2024-04-30 德州市鲁冠制动元件股份有限公司 一种汽车刹车片加工用的压铸成型装置
CN117943524B (zh) * 2024-03-27 2024-05-24 德州市鲁冠制动元件股份有限公司 一种汽车刹车片加工用的压铸成型装置

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