WO2022138621A1 - 射出装置、成形機、型付成形機及び成形方法 - Google Patents

射出装置、成形機、型付成形機及び成形方法 Download PDF

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Publication number
WO2022138621A1
WO2022138621A1 PCT/JP2021/047246 JP2021047246W WO2022138621A1 WO 2022138621 A1 WO2022138621 A1 WO 2022138621A1 JP 2021047246 W JP2021047246 W JP 2021047246W WO 2022138621 A1 WO2022138621 A1 WO 2022138621A1
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Prior art keywords
pressure
injection
cylinder
accumulator
chamber
Prior art date
Application number
PCT/JP2021/047246
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English (en)
French (fr)
Japanese (ja)
Inventor
眞 辻
俊昭 豊島
敏彰 中野
俊治 藤岡
三郎 野田
Original Assignee
芝浦機械株式会社
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 芝浦機械株式会社 filed Critical 芝浦機械株式会社
Priority to CN202180079392.3A priority Critical patent/CN116583365A/zh
Priority to MX2023007250A priority patent/MX2023007250A/es
Publication of WO2022138621A1 publication Critical patent/WO2022138621A1/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
    • 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
    • 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

Definitions

  • the present disclosure relates to an injection device, a molding machine including the injection device, a molded molding machine including the molding machine, and a molding method using the injection device.
  • the molding machine is, for example, a die casting machine for molding metal or an injection molding machine for molding resin.
  • Patent Documents 1 to 3 a technique of performing so-called local pressurization is known (for example, Patent Documents 1 to 3 below).
  • a technique of performing so-called local pressurization is known (for example, Patent Documents 1 to 3 below).
  • the molding material is pressed by a pressure pin inserted into the mold. This reduces, for example, sink marks caused by solidification shrinkage of the molding material.
  • the pressure pin is driven by, for example, a pressure cylinder (hydraulic cylinder).
  • Patent Document 1 discloses a technique for communicating a pressure cylinder and an injection cylinder.
  • the injection cylinder is a hydraulic cylinder that drives a plunger that pushes the molten metal in the sleeve into the cavity.
  • the injection cylinder has an injection piston connected to a plunger and a cylinder member accommodating the injection piston.
  • the inside of the cylinder member is divided into a rod side chamber on the plunger side and a head side chamber on the opposite side by an injection piston.
  • the rod side chamber and the pressure cylinder are communicated with each other.
  • Japanese Unexamined Patent Publication No. 2011-16141 Japanese Unexamined Patent Publication No. 2016-19609 Japanese Unexamined Patent Publication No. 2002-210550
  • the drive device for driving the pressurizing member pressurizing pin
  • various devices including those described in the above patent document have been proposed.
  • the various drives and / or operations have advantages and disadvantages when compared to each other.
  • the performance required for the drive device of the pressurizing member differs depending on the user. Therefore, it is preferable that a new driving device for driving the pressurizing member is proposed and the technique is enriched.
  • the injection device includes an injection cylinder and a hydraulic pressure device.
  • the injection cylinder is connected to a plunger that injects the molding material into the cavity.
  • the hydraulic device is connected to the injection cylinder and the pressurizing cylinder.
  • the pressurizing cylinder is connected to a pressurizing member that locally pressurizes the molding material filled in the cavity.
  • the injection cylinder has an injection piston connected to the plunger and a cylinder member slidably accommodating the injection piston.
  • the cylinder member has a head side chamber on which the pressure of the hydraulic fluid is applied to the surface of the injection piston opposite to the plunger.
  • the hydraulic pressure device has a continuous passage. The communication passage communicates the head side chamber with the first chamber. The first chamber is supplied with a hydraulic fluid when the pressurizing member of the pressurizing cylinder is advanced toward the cavity.
  • the molding machine includes the injection device and a mold clamping device for holding a mold constituting the cavity.
  • the molding machine includes the molding machine, the mold, the pressure member arranged in the mold, and the pressure cylinder arranged in the mold. is doing.
  • the molding method according to one aspect of the present disclosure includes an injection step in which injection is performed by the above injection device.
  • the pressure applied to the hydraulic fluid in the head side chamber is also applied to the hydraulic fluid in the first chamber via the communication passage during at least a part of the period from the start of injection to the completion of holding pressure.
  • a new injection device, molding machine, molded molding machine and molding method for driving a pressure member by utilizing the pressure in the head side chamber of the injection cylinder are provided.
  • FIG. 3 is a circuit diagram showing a configuration of a main part related to local pressurization in the die casting machine of FIG.
  • FIG. 3A is a schematic view illustrating the operation of the die casting machine of FIG. 1 during injection
  • FIG. 3B is an enlarged view of region IIIb of FIG. 3A
  • 4 (a) is a schematic diagram illustrating the operation of the die casting machine of FIG. 1 when filling is completed
  • FIG. 4 (b) is an enlarged view of region IVb of FIG. 4 (a).
  • 5 (a) is a schematic diagram illustrating the operation of the die casting machine of FIG. 1 during pressure increase
  • FIG. 3 is a circuit diagram showing a configuration of a main part related to local pressurization in the die casting machine of FIG.
  • FIG. 3A is a schematic view illustrating the operation of the die casting machine of FIG. 1 during injection
  • FIG. 3B is an enlarged view of region IIIb of FIG. 3A
  • 4 (a) is a schematic diagram illustrating the operation of the die
  • FIG. 5 (b) is an enlarged view of the region Vb of FIG. 5 (a).
  • a timing chart illustrating the operation of the die casting machine of FIG. The circuit diagram which shows the structure of the main part of the die casting machine which concerns on 2nd Embodiment.
  • FIG. 1 is a side view (including a cross-sectional view in part) showing the configuration of a main part of the die-casting machine DC1 according to the first embodiment.
  • the left side of the paper in FIG. 1 may be referred to as the front, and the right side of the paper in FIG. 1 may be referred to as the rear.
  • the die-casting machine DC1 with a mold has a mold 101 and a die-casting machine 1 holding the mold 101.
  • the die casting machine 1 is configured as a device for manufacturing a product (molded product, die casting product) made of solidified molding material by injecting (filling) a molten molding material into the inside (cavity 107) of the mold 101. ing.
  • the molding material is, for example, a metal such as aluminum.
  • the molten metal is sometimes called a molten metal.
  • the molding material in the solid-liquid coexisting state (semi-solidified state or semi-melted state) may be injected into the cavity 107.
  • the mold 101 has, for example, a fixed mold 103 and a moving mold 105 facing the fixed mold 103.
  • the cavity 107 into which the molding material is injected is configured between the fixed mold 103 and the mobile mold 105.
  • the fixed mold 103 is a mold that does not move.
  • the movable mold 105 is a mold that moves in a direction facing the fixed mold 103 (mold opening / closing direction).
  • the mold opening / closing direction is, for example, the horizontal direction.
  • FIG. 1 and the like for convenience, the cross section of the fixed type 103 or the mobile type 105 is shown by one type of hatching. However, these molds may be directly carved or nested.
  • the fixed type 103 and / or the mobile type 105 may include a die base.
  • the die casting machine 1 has a machine main body 3 that performs mechanical operation and a control device 5 that controls the machine main body 3.
  • the machine body 3 is, for example, a mold clamping device 7 that opens and closes and clamps the mold 101, an injection device 9 that injects molten metal into the cavity 107, and a fixed mold 103 or a product configured by solidifying the molten metal. It has an extruder (not shown) that extrudes from the mobile die 105.
  • the control device 5 may be regarded as a component of the injection device 9.
  • the die-casting machine DC1 with a mold has a pressurizing device LM1 (reference numeral is FIG. 2) that locally pressurizes the molten metal filled in the cavity 107.
  • a pressurizing device LM1 reference numeral is FIG. 2
  • the hydraulic pressure system of the pressurizing device LM1 is connected to and / or shared with the hydraulic pressure system of the injection device 9, and the distinction between the pressurizing device LM1 and the injection device 9 is not always clear.
  • the components of the pressurizing device LM1 may be regarded as the components of the injection device 9.
  • the configuration and operation of the devices other than the pressurizing device LM1 may be known or may be new. In other words, it may be in various modes. The description of the known configuration and operation may be omitted as appropriate.
  • the mold clamping device 7, the injection device 9, and the control device 5 will be briefly described.
  • a portion of the hydraulic pressure system of the injection device 9 which may have the same configuration as the known configuration will be briefly described.
  • the pressurizing device LM1 will be described.
  • the mold clamping device 7 is inserted into, for example, a base 11, a fixed die plate 13 fixed on the base 11, a moving die plate 15 that can move in the mold opening / closing direction on the base 11, and these die plates. It has a plurality of (for example, four) tie bars 17 and the like.
  • the fixed die plate 13 and the moving die plate 15 face each other in the mold opening / closing direction.
  • the fixed die plate 13 holds the fixed die 103 on the surface facing the moving die plate 15.
  • the moving die plate 15 holds the moving die 105 on a surface facing the fixed die plate 13.
  • the mold 101 is opened and closed by moving the moving die plate 15 in the mold opening / closing direction. Further, by extending the tie bar 17 in a state where the mold is closed, a mold clamping force corresponding to the extension amount is applied to the mold 101.
  • the injection device 9 is located behind the fixed die plate 13 (on the opposite side of the moving die plate 15).
  • the injection device 9 has a sleeve 19 leading to the cavity 107, a plunger 21 for pushing the molten metal in the sleeve 19 into the cavity 107, and a drive unit 23 for driving the plunger 21. Since the sleeve 19 and the plunger 21 can be regarded as consumables, only the drive unit 23 may be regarded as an injection device.
  • the sleeve 19 is provided so as to be inserted through the fixed die plate 13.
  • the sleeve 19 may not be inserted through the fixed mold 103 (example of FIG. 1), or may be inserted.
  • the sleeve 19 is a substantially cylindrical member, and is arranged so as to extend in the horizontal direction (front-back direction).
  • a supply port 19a to which the molten metal is supplied is opened on the upper surface of the sleeve 19.
  • the plunger 21 has a plunger tip 21a that slides on the sleeve 19 and a plunger rod 21b that is fixed to the plunger tip 21a.
  • the plunger rod 21b extends in the front-rear direction, and its rear end is connected to the drive unit 23 by a coupling 25.
  • FIG. 1 shows the state before the start of injection.
  • the plunger tip 21a is located (at least partially) in the sleeve 19 behind the supply port 19a.
  • the molten metal is poured into the supply port 19a by a hot water supply device (not shown) or the like.
  • the plunger tip 21a slides (advances) toward the cavity 107 by the driving force of the driving unit 23. As a result, the molten metal is ejected into the cavity 107.
  • the control device 5 may be configured to include, for example, a computer, although not particularly shown.
  • the computer may be configured to include, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an external storage device, although not particularly shown.
  • a CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • an external storage device although not particularly shown.
  • the control device 5 may include a logic circuit that executes a certain operation, may include a power supply circuit, or may be conceptualized including a driver.
  • the control device 5 may be integrated in one place in terms of hardware, or may be distributed in a plurality of places.
  • FIG. 2 is a circuit diagram showing a configuration of a main part related to local pressurization in the die casting machine DC1 with a mold.
  • FIG. 2 also shows the configuration of the injection device 9.
  • the drive unit 23 of the injection device 9 has an injection cylinder 27 connected to the rear end of the plunger 21 by a coupling 25, and a hydraulic pressure device 29 communicating with the injection cylinder 27.
  • a part of the configuration of the pressurizing device LM1 may be regarded as the configuration of the injection device 9, and the hydraulic pressure device 29 includes a portion that can be regarded as a part of the pressurizing device LM1. I'm out.
  • the injection cylinder 27 is arranged coaxially with the plunger 21 behind the plunger 21.
  • the injection cylinder 27 includes, for example, a cylinder member 31, an injection piston 33 and a pressure boosting piston 35 slidable inside the cylinder member 31, and a piston rod 37 extending forward (toward the plunger 21 side) from the injection piston 33.
  • the cylinder member 31 is, for example, a roughly cylindrical member.
  • the shape of the cross section inside the cylinder member 31 is, for example, a circle.
  • the outer shape (outer shape) of the cylinder member 31 may have an appropriate shape such as a rectangular parallelepiped shape.
  • the cylinder member 31 is immovable with respect to the fixed die plate 13.
  • the cylinder member 31 has a small-diameter cylinder 31x and a large-diameter cylinder 31y connected in series to the rear end of the small-diameter cylinder 31x.
  • the inner diameter of the large diameter cylinder 31y is larger than the inner diameter of the small diameter cylinder 31x.
  • the injection piston 33 is slidably arranged in the small diameter cylinder 31x.
  • the shape of the injection piston 33 is, for example, generally cylindrical.
  • the diameter of the injection piston 33 is substantially the same as the inner diameter of the small diameter cylinder 31x.
  • a packing (not shown) may be interposed between the injection piston 33 and the small diameter cylinder 31x. Even when the packing is interposed, it is expressed that the injection piston 33 slides in the small diameter cylinder 31x (cylinder member 31).
  • other members for example, the pressure boosting piston 35.
  • the space inside the small diameter cylinder 31x is partitioned by the injection piston 33 into a rod side chamber 31r on the piston rod 37 side and a head side chamber 31h on the opposite side.
  • the pressure boosting piston 35 has a small diameter piston 35x that slides on the small diameter cylinder 31x and a large diameter piston 35y that slides on the large diameter cylinder 31y.
  • the large diameter piston 35y is connected to the rear end of the small diameter piston 35x.
  • Each of the small-diameter piston 35x and the large-diameter piston 35y is, for example, a roughly columnar member. Note that, unlike the illustrated example, a connecting portion having a diameter smaller than the diameter of the small diameter piston 35x may be formed between the small diameter piston 35x and the large diameter piston 35y.
  • the inside of the large-diameter cylinder 31y is divided into a front side chamber 31a and a rear side chamber 31b by a large-diameter piston 35y.
  • the pressure boosting piston 35 has a first surface 35c that receives pressure from the hydraulic fluid of the head side chamber 31h and a second surface 35d that receives pressure from the hydraulic fluid of the rear side chamber 31b.
  • the area of the second surface 35d is larger than the area of the first surface 35c.
  • the area ratio may be appropriately set.
  • the area here is an area to which a pressure contributing to sliding the boosting piston 35 in the axial direction is applied, in other words, a projected area seen in the axial direction. Therefore, the area here is constant regardless of the unevenness of the first surface 35c and the second surface 35d. The same applies to the areas S1 to S4 described later.
  • the piston rod 37 is, for example, a roughly columnar member.
  • the diameter of the piston rod 37 is smaller than the diameter of the injection piston 33. The difference may be set as appropriate.
  • the piston rod 37 extends to the outside of the cylinder member 31, and its front end is connected to the rear end of the plunger 21 by a coupling 25.
  • the injection piston 33 moves forward by supplying the hydraulic fluid to the head side chamber 31h.
  • the plunger 21 connected to the injection piston 33 via the piston rod 37 and the coupling 25 advances.
  • the molten metal in the sleeve 19 is ejected into the cavity 107. That is, injection in a narrow sense (injection that does not include the pressure boosting described later) is performed.
  • the hydraulic fluid in the head side chamber 31h is pressurized by the pressure boosting piston 35.
  • the pressure boosting piston 35 can apply a pressure higher than the pressure of the rear side chamber 31b to the head side chamber 31h.
  • the pressure in the head side chamber 31h is transmitted to the molding material filled in the cavity 107 via the injection piston 33, the piston rod 37 and the plunger 21. As a result, the pressure is increased to increase the pressure of the molding material.
  • the front chamber 31a may or may not be filled with the hydraulic fluid.
  • the front concubine 31a may be open to the atmosphere.
  • the front chamber 31a may be provided with a small amount of the hydraulic fluid (oil) for lubrication.
  • this hydraulic fluid may or may not be used for some purpose.
  • a hydraulic fluid is supplied to the front side chamber 31a to apply a rearward driving force to the pressure boosting piston 35 can be mentioned.
  • an embodiment may be mentioned in which the discharge of the hydraulic fluid from the front chamber 31a is prohibited and the unintended advancement of the pressure boosting piston 35 is prohibited.
  • an embodiment in which the front concubine 31a and the tank are only connected can be mentioned.
  • the configuration of the hydraulic pressure device 29 related to the drive of the injection cylinder 27 may be a known configuration or a new configuration. In other words, it may be in various modes.
  • FIG. 2 shows a main part of an example of various aspects. Specifically, it is as follows.
  • the hydraulic pressure device 29 has, for example, an injection accumulator 39 as a hydraulic pressure source, a tank 41 for storing the hydraulic fluid, and a hydraulic pressure circuit 43 for controlling the flow of the hydraulic fluid.
  • the hydraulic pressure device 29 may have a pump as a hydraulic pressure source, but the illustration is omitted here.
  • the injection accumulator 39 contributes, for example, to the supply of the hydraulic fluid to the injection cylinder 27.
  • the injection accumulator 39 may be composed of an appropriate type accumulator such as a weight type, a spring type, a gas pressure type (including a pneumatic type), a cylinder type, and a Prada type.
  • the injection accumulator 39 is a gas pressure type, cylinder type or Prada type accumulator, and the gas (for example, air or nitrogen) held in the injection accumulator 39 is compressed to accumulate pressure.
  • the tank 41 is, for example, an open tank. That is, the tank 41 holds the hydraulic fluid under atmospheric pressure. Therefore, for example, when the rod side chamber 31r is connected to the tank 41, the pressure of the rod side chamber 31r drops to atmospheric pressure or a pressure close to the atmospheric pressure.
  • the hydraulic circuit 43 has, for example, a flow path 43a connecting the accumulator 39 for injection and the head side chamber 31h.
  • the flow path 43a enables, for example, the supply of the hydraulic fluid from the injection accumulator 39 to the head concubine 31h.
  • the flow path 43a may be provided with an appropriate valve that allows or prohibits the flow of the hydraulic fluid.
  • a check valve 45A is exemplified as such a valve.
  • the check valve 45A is composed of a check valve that is opened and closed by the introduction of pilot pressure. When the pilot pressure is not applied, the check valve 45A allows, for example, the flow from the injection accumulator 39 to the head concubine 31h, and prohibits the flow in the opposite direction.
  • the hydraulic circuit 43 has, for example, a flow path 43b that connects the injection accumulator 39 and the rear concubine 31b.
  • the flow path 43b enables, for example, the supply of the hydraulic fluid from the injection accumulator 39 to the rear concubine 31b.
  • a part of the flow path 43b on the injection accumulator 39 side is shared with the flow path 43a.
  • the flow path 43b may be provided with an appropriate valve that allows or prohibits the flow of the hydraulic fluid.
  • a check valve 45B is exemplified as such a valve.
  • the check valve 45B is composed of a check valve that is opened and closed by the introduction of pilot pressure. When the pilot pressure is not applied, the check valve 45B allows, for example, the flow from the injection accumulator 39 to the rear concubine 31b, and prohibits the flow in the opposite direction.
  • the hydraulic circuit 43 has, for example, a flow path 43c connecting the rod side chamber 31r and the tank 41. Through the flow path 43c, for example, the hydraulic fluid in the rod side chamber 31r whose volume decreases as the injection piston 33 advances can be discharged to the tank 41.
  • the flow path 43c may be provided with an appropriate valve that allows or prohibits the flow of the hydraulic fluid.
  • a flow control valve 47 is exemplified as such a valve.
  • the speed of the injection piston 33 is controlled by the flow rate control by the flow rate control valve 47. That is, the hydraulic pressure circuit 43 has a so-called meter-out circuit.
  • the flow rate control valve 47 is composed of, for example, a flow rate adjusting valve with pressure compensation that can keep the flow rate constant even if there is a pressure fluctuation. Further, the flow rate control valve 47 is used in, for example, a servo mechanism, and is configured by a servo valve capable of steplessly (continuously, to an arbitrary value) modulation of the flow rate according to an input signal.
  • the hydraulic circuit 43 may include various components in addition to the above. For example, although not particularly shown, a flow path connecting the pump and the rod side chamber 31r, a flow path connecting the tank 41 and the front side chamber 31a, a flow path connecting the injection accumulator 39 and the pump, and these flows. Valves may be provided in each path to allow or prohibit the flow of hydraulic fluid.
  • a flow control valve located in the flow path 43a (which may or may not be a shared portion with the flow path 43b) is provided. It's okay. That is, a meter-in circuit may be provided. Further, for example, a flow path for returning the hydraulic fluid of the rod side chamber 31r to the head side chamber 31h, and a valve for allowing or prohibiting the flow of the flow path may be provided. That is, a run-around circuit may be provided.
  • the flow control valve of the meter-out circuit may be located in the flow path constituting the run-around circuit, or may be located in the flow path connecting the run-around circuit and the tank 41 (outside the run-around circuit). May be good.
  • the pressurizing device LM1 has a pressurizing member 49 that pressurizes the molten metal filled in the cavity 107, and a pressurizing cylinder 51 that drives the pressurizing member 49.
  • These configurations may be known configurations or novel configurations, in other words, various embodiments may be used. For example:
  • FIG. 3 (b) is an enlarged cross-sectional view (enlarged view of region IIIb in FIG. 3 (a) described later) showing the pressure member 49 and its surroundings in an enlarged manner.
  • FIG. 3 (b) should be referred to as appropriate.
  • the shape of the pressurizing member 49 may be substantially pin-shaped with the advancing / retreating direction as the longitudinal direction (example in the figure), or may not be pin-shaped. As an example of the latter, a block-shaped shape having a diameter larger than the length of the pressure member 49 in the advancing / retreating direction can be mentioned. Further, the shape of the cross section orthogonal to the advancing / retreating direction of the pressure member 49 may be circular (example in the figure) or may be a shape other than circular. The dimensions of the pressurizing member 49 are also arbitrary.
  • the pressure member 49 may have a tapered shape in which at least a part of the tip side (cavity 107 side) has a smaller diameter toward the tip side. In this case, it is easy to pull out the pressure member 49 from the solidified molding material.
  • the tapered range may be set as appropriate.
  • the pressure member 49 may have a shape that does not taper (for example, a shape having a constant diameter).
  • the pressurizing member 49 may be arranged in the fixed mold 103 (illustrated example) or in the mobile mold 105. However, in the present embodiment, the pressurizing device LM1 is connected to the injection device 9. The injection device 9 is generally fixed to the fixed mold 103. Therefore, if the pressurizing member 49 is arranged in the fixed mold 103, for example, the configuration of the hydraulic pressure device 29 shared by the pressurizing device LM1 and the injection device 9 is miniaturized and / or simplified.
  • the description may be made on the premise that the pressure member 49 is arranged on the fixed mold 103.
  • a part or all of the pressure member 49 may slide (contact) with respect to the mold (fixed mold 103 or mobile mold 105) in the advancing / retreating direction.
  • the portion of the pressurizing member 49 on the rear end side may be located outside the mold, or the entire pressurizing member 49 may be located inside the mold.
  • an embodiment in which the rear end side portion of the pressurizing member 49 is located in a space formed by a die base (not shown) can be mentioned.
  • the advancing / retreating direction of the pressurizing member 49 may be an appropriate direction.
  • the advancing / retreating direction may be the mold opening / closing direction (left-right direction in FIG. 2) (illustrated example), or may be a direction intersecting (orthogonal or inclined) with the mold opening / closing direction.
  • the advancing / retreating direction is the mold opening / closing direction, for example, an operation of peeling the molded product from the mold in which the pressure member 49 is arranged (may be a mold opening operation and / or an extrusion operation). It is also possible to pull out the pressure member 49 from the molded product.
  • the arrangement position of the pressure member 49 with respect to the cavity 107 may be appropriately set.
  • the cavity 107 has a product portion 107a having a shape corresponding to the product shape, and an overflow 107b into which excess molten metal flows.
  • the pressurizing member 49 is arranged to pressurize the molten metal that has flowed into the overflow 107b.
  • the pressurizing member 49 may be arranged so as to pressurize the molten metal located in the product portion 107a.
  • the pressurizing member 49 may be arranged at a position where a sink mark is likely to occur, for example.
  • the overflow 107b is normally connected to the outer periphery of the product portion 107a (particularly at a position away from the sleeve 19) when viewed in the mold opening / closing direction. Therefore, the pressurizing member 49 that pressurizes the molten metal of the overflow 107b can apply pressure to the molten metal on the outer peripheral side, which is difficult to apply pressure by the plunger 21 among the molten metal in the product portion 107a. As a result, for example, the molten metal in the product section 107a tends to be evenly pressured as a whole. As a result, when molding a large-sized product, it is possible to reduce the need to increase the pressure applied to the molten metal by the plunger 21. From another point of view, the need for increasing the size of the die casting machine 1 can be reduced.
  • the fixed mold 103 (the mold in which the pressurizing member 49 is arranged) may have a recess 107c on the surface on the moving die 105 side into which the tip end side portion of the pressurizing member 49 is taken in and out.
  • the recess 107c may have a larger diameter than, for example, the tip end side portion of the pressurizing member 49, or may have a reverse taper shape having a larger diameter toward the movable type 105 side, for example.
  • the recess 107c ensures that the cavity 107 has a volume for moving the pressure member 49 in and out of the cavity 107. Further, the reverse taper shape makes it easier for the solidified molding material to come out of the fixed mold 103.
  • the fixed mold 103 may not have such a recess 107c, or may have a recess 107c that is not reverse-tapered.
  • the number of the pressurizing members 49 may be appropriately set, may be one, or may be two or more. In FIG. 2, one pressurizing member 49 is shown to avoid complication of the figure.
  • the pressure cylinder 51 has, for example, a cylinder member 53, a pressure piston 55 slidable inside the cylinder member 53, and a piston rod 57 extending from the pressure piston 55 to the outside of the cylinder member 53. There is.
  • the cylinder member 53 is, for example, a roughly cylindrical member.
  • the shape of the cross section inside the cylinder member 53 is, for example, circular.
  • the outer shape (outer shape) of the cylinder member 53 may be an appropriate shape such as a rectangular parallelepiped shape.
  • the pressure piston 55 is, for example, a roughly columnar member, and can slide inside the cylinder member 53 in the axial direction.
  • the space inside the cylinder member 53 is partitioned by the pressure piston 55 into a rod side chamber 53r on the piston rod 57 side and a head side chamber 53h on the opposite side.
  • the piston rod 57 is, for example, a roughly columnar member.
  • the diameter of the piston rod 57 is smaller than the diameter of the pressure piston 55. The difference may be set as appropriate.
  • the pressurizing cylinder 51 is arranged coaxially on the side opposite to the cavity 107 of the pressurizing member 49, and the piston rod 57 side is directed toward the pressurizing member 49, for example.
  • the cylinder member 53 is immovable with respect to the fixed mold 103 (the mold in which the pressurizing member 49 is arranged).
  • the cylinder member 53 is fixed to the fixed mold 103 and / or the fixed die plate 13 with bolts or the like.
  • the tip of the piston rod 57 is connected to the rear end of the pressurizing member 49 by an appropriate coupling (reference numeral omitted).
  • the cylinder member 53 may be fixed to the pressurizing member 49, and the piston rod 57 may be immovable with respect to the fixed mold 103. Further, the orientation of the pressure cylinder 51 may be opposite to that described above. That is, which of the cylinder member 53 and the piston rod 57 becomes immobile, and the combination of the directions of the pressure cylinder 51 can be combined in three ways other than those shown in the figure.
  • the cylinder chamber (first chamber) to which the hydraulic fluid is supplied when the pressurizing member 49 is advanced toward the cavity 107 may be the rod side chamber 53r.
  • the pressurizing member 49 advances toward the cavity 107 by supplying the hydraulic fluid to the rod side chamber 53r.
  • the number of pressure members 49 driven by one pressure cylinder 51 may be one (example in the figure) or two or more. In the latter case, for example, as can be inferred from a known extruder, a plate-shaped member orthogonal to the piston rod 57 is fixed to the tip of the piston rod 57, and a plurality of pressure members 49 are fixed in parallel to the plate-shaped member. You can do it. In addition, in the description of this embodiment, for convenience, the description may be made on the premise of the illustrated aspect (the aspect in which the pressurizing cylinder 51 drives one pressurizing member 49).
  • the movement of the pressure piston 55 (retraction of the pressure member 49 from the cavity 107) by supplying the hydraulic fluid to the rod side chamber 53r is not always performed. good. Therefore, the rod side chamber 53r may or may not be filled with the hydraulic fluid. In the latter case, for example, the rod side chamber 53r may be open to the atmosphere. In this case, a small amount of oil as a hydraulic fluid may be arranged in the rod side chamber 53r for the purpose of lubrication or the like. Further, when the rod side chamber 53r is filled with the hydraulic fluid, the rod side chamber 53r is only supplied with a shortage of the hydraulic fluid from the tank 41 or the drive limit (for example, a pump) when its volume expands. good.
  • the drive limit for example, a pump
  • the pressure piston 55 extends from the cylinder member 53 to the side opposite to the head side chamber 31h (from another viewpoint, the diameter of the piston rod 57 is the same as the diameter of the pressure piston 55).
  • the configuration may not have the rod side chamber 53r. However, in the description of the present embodiment, for convenience, the description may be made on the premise of the illustrated aspect (the aspect in which the pressure cylinder 51 has the rod side chamber 53r).
  • the hydraulic pressure device 29 is connected to the head side chamber 53h of the pressure cylinder 51, and enables the inflow and outflow of the hydraulic fluid to the head side chamber 53h. Specifically, it is as follows.
  • the hydraulic circuit 43 of the hydraulic pressure device 29 has a communication passage 43d that connects the head side chamber 31h of the injection cylinder 27 and the head side chamber 53h of the pressure cylinder 51.
  • the communication passage 43d has a part on the head side chamber 31h side shared with a part on the head side chamber 31h side of the flow path 43a communicating the injection accumulator 39 and the head side chamber 31h.
  • the continuous passage 43d and the flow path 43a may be a flow path that is completely separate from each other. Further, of the continuous passages 43d as shown in the figure, only the portion that is not shared with the flow path 43a may be regarded as the continuous passage.
  • the pressure applied to the head side chamber 31h of the injection cylinder 27 can be transmitted to the head side chamber 53h of the pressurizing cylinder 51.
  • the hydraulic fluid is supplied from the injection accumulator 39 to the head side chamber 31h and the injection is started, the hydraulic fluid is also supplied to the head side chamber 53h and the pressure member 49 is moved to the forward limit. And / or the pressurizing member 49 can be held in the forward limit. The significance of this operation will be described later.
  • the pressurized pressure is also transmitted to the head side chamber 53h to advance the pressurizing member 49 and locally apply the pressure. Pressure can be applied.
  • Appropriate components may be arranged or connected to the communication passage 43d.
  • the throttle valve 59A, the switching valve 61, the check valve 45C, the throttle valve 59B, and the surge accumulator 63 are arranged or connected in order from the head side chamber 31h side. It should be noted that one or more or all of these components may not be provided.
  • the throttle valve 59A is a so-called uncompensated flow rate control valve that maintains a constant relationship between the flow rate and the pressure difference by making the opening degree constant.
  • the specific configuration of the throttle valve 59A may be various configurations including known configurations such as a needle valve, a disc valve, and a ball valve.
  • the opening degree of the throttle valve 59A may be fixed or variable, but is constant over at least one forming cycle and is smaller than the cross-sectional area of the communication passage 43d.
  • the throttle valve 59A is located in the communication passage 43d and regulates the flow rate (pressure difference) in the communication passage 43d.
  • This regulation contributes to, for example, adjusting the timing of applying pressure to the head side chamber 31h of the injection cylinder 27 and the timing of applying pressure to the head side chamber 53h of the pressurizing cylinder 51.
  • the communication passage 43d may be configured so that the cross-sectional area of the communication passage 43d is locally reduced.
  • the switching valve 61 is located in the communication passage 43d, and allows and prohibits the flow of the hydraulic fluid in the communication passage 43d.
  • the switching valve 61 is a switching valve with two ports and two positions, is closed by a spring, and is driven to an open position by a solenoid.
  • the switching valve 61 is closed at an appropriate time, for example, to regulate an unintended operation of the pressurizing cylinder 51.
  • a pilot type check valve such as the check valve 45A may be provided instead of the switching valve 61.
  • the check valve 45C is located in the communication passage 43d, and allows the flow of the hydraulic fluid from the side of the head side chamber 31h of the injection cylinder 27 to the side of the head side chamber 53h of the pressure cylinder 51, and allows the flow in the opposite direction. restrict. Therefore, for example, while allowing the pressure applied to the head side chamber 31h to be applied to the head side chamber 53h, there is a possibility that the high pressure generated in the head side chamber 53h due to the surge pressure described later is transmitted to the side of the head side chamber 31h. It will be reduced.
  • the check valve 45C is not a pilot type, but may be a pilot type.
  • the throttle valve 59B has the same configuration as that of the throttle valve 59A, and the above-mentioned description regarding the configuration of the throttle valve 59A may be appropriately referred to the throttle valve 59B. Of course, the specific configuration such as size and shape may be different between the two.
  • the opening degree of the throttle valve 59B may be fixed or variable, but is constant over at least one forming cycle and is smaller than the cross-sectional area of the communication passage 43d. That is, the flow rate in the throttle valve 59B is smaller than the flow rate in the communication passage 43d.
  • the throttle valve 59B is located in a flow path (reference numeral omitted) that bypasses the check valve 45C.
  • the throttle valve 59B By regulating the flow rate, the throttle valve 59B contributes to reducing the probability that the high pressure generated in the head side chamber 53h of the pressurizing cylinder 51 due to the surge pressure is transmitted to the injection cylinder 27 side, for example.
  • the throttle valve 59B allows, for example, the hydraulic fluid that has flowed into the surge accumulator 63 to be discharged to the injection cylinder 27 side by not completely prohibiting the flow.
  • the bypass flow path may be configured so that the cross-sectional area of a part or all of the bypass flow path is smaller than the cross-sectional area of the communication passage 43d.
  • the surge accumulator 63 is connected to the communication passage 43d, and contributes to absorption of, for example, a temporary and sudden increase in pressure (surge pressure) of the molten metal.
  • the surge accumulator 63 does not absorb the pressure generated in the injection cylinder 27 (the pressure applied to the plunger 21 from the molten metal from another viewpoint) as in the known surge accumulator, but is a pressure cylinder. It absorbs the pressure generated in 51 (in another viewpoint, the pressure applied to the pressurizing member 49 from the molten metal).
  • the above-mentioned description about the configuration of the injection accumulator 39 may be appropriately incorporated into the surge accumulator 63. However, the surge accumulator 63 may have a smaller pressure accumulator or a smaller amount of hydraulic fluid that can be discharged than the injection accumulator 39.
  • the surge accumulator 63 is a cylinder type.
  • the cylinder-type surge accumulator 63 has a cylinder member 63a and a piston 63b slidable in the cylinder member 63a.
  • the inside of the cylinder member 63a is divided into a liquid chamber 63c and a gas chamber 63d by a piston 63b.
  • the liquid chamber 63c leads to the communication passage 43d.
  • the gas chamber 63d is filled with an appropriate type of gas (for example, nitrogen).
  • the parameters such as the dimensions and pressure of the components described so far, and the magnitude relationship between the components of these parameters may be appropriately set.
  • the following are examples of parameters that can exert a specific effect.
  • the cross-sectional area of the injection cylinder 27, the plunger 21, the pressurizing cylinder 51, and the pressurizing member 49 may be appropriately set. For example, these may be set as follows.
  • the area where the pressure piston 55 receives pressure from the hydraulic fluid in the head side chamber 53h of the pressurizing cylinder 51 (in other words, the cylinder chamber to which the hydraulic fluid is supplied when local pressurization is performed) is defined as S3.
  • S4 be the area where the pressure member 49 applies pressure to the molding material of the cavity 107.
  • S1 be the area where the injection piston 33 receives pressure from the hydraulic fluid in the head side chamber 31h of the injection cylinder 27.
  • S2 be the area where the plunger 21 applies pressure to the molding material of the cavity 107.
  • S4 / S3 is 0.5 times or more and 1.5 times or less, 0.8 times or more and 1.2 times or less, 0.9 times or more and 1.1 times or less with respect to S2 / S1. It may be 1.0 times or more and 1.5 times or less, 1.0 times or more and 1.2 times or less, or 1.0 times or more and 1.1 times or less.
  • the ratio of S4 / S3 to S2 / S1 may be outside the above range.
  • decimal digits not listed may be rounded off.
  • the range of 0.5 times or more may include 0.45 times.
  • the range of 1.5 times or less may include 1.54 times. The same shall apply to other numerical ranges.
  • the pressure applied to the molding material by the plunger 21 and the pressure applied to the molding material by the pressure member 49 can be made equal to each other. Specifically, it is as follows.
  • the pressure applied to the molding material by the plunger 21 is S2 / S1 times the pressure of the head side chamber 31h.
  • the pressure applied to the molding material by the pressurizing member 49 is S4 / S3 times the pressure of the head side chamber 53h.
  • the head side chamber 31h and the head side chamber 53h are connected by a communication passage 43d, and the pressures of both cylinder chambers can be the same. Therefore, theoretically, the ratio of the pressure applied to the molding material by the pressurizing member 49 to the pressure applied to the molding material by the plunger 21 is the same as the ratio of S4 / S3 to S2 / S1. If the ratio of S4 / S3 to S2 / S1 is within the above range, the pressure applied to the molding material by the plunger 21 and the pressure applied to the molding material by the pressurizing member 49 are generally equal to each other.
  • the area where all the pressure members 49 driven by one pressure cylinder 51 apply pressure to the molding material of the cavity 107. It may be determined whether or not the ratio of S2 / S1 of S4 / S3 falls within the above range, where the total area is S4. When there are two or more pressure cylinders 51, the condition that the ratio of S4 / S3 to S2 / S1 falls within the above range may be satisfied for some (at least one) pressure cylinders 51. However, it may be established for all the pressure cylinders 51.
  • the volume of the surge accumulator 63 and the volume of the pressure cylinder 51 may be appropriately set. For example, these may be set as follows.
  • the maximum amount of change in the volume of the head side chamber 53h is defined by the movable range of the pressure piston 55 with respect to the cylinder member 53.
  • the movable range of the pressure piston 55 is regulated by, for example, a stopper (which may be the inner surface of the end of the cylinder member 53) included in the cylinder member 53.
  • a stopper which may be the inner surface of the end of the cylinder member 53 included in the cylinder member 53.
  • one stopper contacts the pressure piston 55 from the front to the rear (engages from another viewpoint) when the pressure piston 55 is located in the forward limit (drive limit), and the pressure piston 55 is changed. Regulate the progress.
  • the other stopper abuts the pressure piston 55 from the rear to the front when the pressure piston 55 is located in the retreat limit (drive limit) to restrict further retreat of the pressure piston 55.
  • the stopper that the immovable member (for example, the fixed mold 103 or the fixed die plate 13) has on the outside of the cylinder member 53 is the piston rod 57, the pressure member 49, or the coupling connecting them (reference numeral omitted).
  • the movable range of the pressure piston 55 may be defined. That is, the movable range may be mechanically defined regardless of the pressure of the hydraulic fluid.
  • the surge accumulator 63 has a piston 63b.
  • a configuration having the piston 63b as shown in the illustrated example, a configuration in which the inside of the cylinder member 63a is divided into a liquid chamber 63c and a gas chamber 63d by the piston 63b can be mentioned.
  • the piston 63b (ram) extends from the cylinder member 63a to the side opposite to the liquid chamber 63c, and the piston 63b is urged to the side of the liquid chamber 63c by gravity and / or a spring.
  • the configuration to be used is mentioned.
  • the maximum amount of change in the volume of the liquid chamber 63c may be defined by the movable range of the piston 63b with respect to the cylinder member 63a, similarly to the pressure cylinder 51.
  • the movable range of the piston 63b is mechanically (eg, by engagement) defined, similar to the movable range of the pressure piston 55.
  • the drive limit to the side of the liquid chamber 63c by the stopper which may be the inner surface of the end of the cylinder member 63a) that the cylinder member 63a has inside, or the stopper located outside the cylinder member 63a, and vice versa.
  • a drive limit to the side may be specified.
  • the maximum amount of change in the volume of the head side chamber 53h of the pressure cylinder 51 (referred to as dV1) and the maximum amount of change in the volume of the liquid chamber 63c (referred to as dV2) as described above may be appropriately set. Further, the relative relationship between the two may be set as appropriate.
  • the maximum change amount dV2 is 0.5 times or more and 1.5 times or less, 0.8 times or more and 1.2 times or less, 0.9 times or more and 1.1 times or less, 1 It may be 0.0 times or more and 1.5 times or less, 1.0 times or more and 1.2 times or less, or 1.0 times or more and 1.1 times or less. That is, the maximum change amount dV1 and the maximum change amount dv2 may be the same or close to each other.
  • dV2 / dV1 may be outside the above range.
  • the surge pressure can be sufficiently absorbed by, for example, the surge accumulator 63. Further, for example, it is possible to reduce the probability that the surge accumulator 63 absorbs the pressure to be transmitted from the head side chamber 31h of the injection cylinder 27 to the head side chamber 53h of the pressure cylinder 51.
  • the maximum change in the volume of the surge accumulator 63 is defined by the movable range of the piston 63b (mechanically defined) as an example.
  • the ratio of the maximum change in volume defined by the minimum and maximum pressures that can occur in the liquid chamber 63c of the surge accumulator 63 during the molding cycle to the maximum change in volume in the head side chamber 53h of the pressure cylinder 51 is , The above range may be satisfied.
  • the surge accumulator 63 is not limited to the one having the piston 63b.
  • the pressures of the injection accumulator 39 and the surge accumulator 63 may be appropriately set. For example, these may be set as follows.
  • the surge accumulator 63 has a piston 63b.
  • P2 be the pressure of the surge accumulator 63 when the piston 63b is located at the drive limit of movement toward the liquid chamber 63c.
  • P1 the pressure at the start of discharge of the injection accumulator 39 is P1.
  • the pressure P2 may be, for example, 0.5 times or more and 1.5 times or less, 0.8 times or more and 1.2 times or less, or 0.9 times or more and 1.1 times or less with respect to the pressure P1.
  • P2 / P1 may be outside the above range. When P2 / P1 is in the above range, for example, as will be understood from the description below, the surge accumulator 63 can reduce the probability of unintended hydraulic fluid flow.
  • the typed die casting machine DC1 may have various sensors. Then, the control device 5 may control each part of the hydraulic pressure device 29 and the like based on the detection values of various sensors.
  • a position sensor that detects the position of the plunger 21, a pressure sensor that detects the pressure of the head side chamber 31h, a pressure sensor that detects the pressure of the rod side chamber 31r, and / or the pressure of the injection accumulator 39 is detected.
  • a pressure sensor may be provided. Since the velocity is obtained by differentiating the position, the position sensor may be regarded as a velocity sensor.
  • the various sensors may be of various types, including known configurations.
  • the sensor that detects the position of the plunger 21 is used, for example, to control the injection speed (in other words, the speed of the plunger 21).
  • the pressure sensor that detects the pressure in the head side chamber 31h (and the pressure sensor that detects the pressure in the rod side chamber 31r as needed) is used to control the injection pressure (in other words, the pressure applied to the molding material by the plunger 21).
  • the pressure sensor that detects the pressure of the injection accumulator 39 is used, for example, to control the pressure accumulation of the injection accumulator 39.
  • Outline of operation related to injection and local pressurization 3A to 5B are schematic views showing an outline of the operation of the injection device 9 and the pressurizing device LM1.
  • FIG. 3 (a), 4 (a) and 5 (a) are schematics of FIG. 2 and show states at different time points during the molding cycle.
  • FIG. 3 (b) is an enlarged view of region III of FIG. 3 (a).
  • FIG. 4 (b) is an enlarged view of region III of FIG. 4 (a).
  • FIG. 5 (b) is an enlarged view of region III of FIG. 5 (a).
  • FIGS. 3 (a), 4 (a) and 5 (a) only a part of the reference numerals shown in FIG. 2 is shown due to space limitations. Please refer to FIG. 2 as appropriate for the reference numerals in the following description.
  • the thickly shown channels indicate that the hydraulic fluid is flowing (in another aspect, pressure is applied).
  • FIG. 3A shows a state in which injection (injection process) in a narrow sense such as low-speed injection and high-speed injection is performed.
  • injection process the hydraulic fluid is supplied from the injection accumulator 39 to the head side chamber 31h.
  • the injection piston 33 advances, and the plunger 21 pushes the molten metal 109 in the sleeve 19 into the cavity 107.
  • the pressure of the injection accumulator 39 is also applied to the head side chamber 53h of the pressure cylinder 51 via the communication passage 43d.
  • the pressurizing member 49 is located at the drive limit on the cavity 107 side (see also the position of the pressurizing piston 55 in FIG. 3A).
  • the drive limit of the pressurizing member 49 may be defined by engagement in the pressurizing cylinder 51, as can be understood from the description of the drive limit described above in the pressurizing cylinder 51, or may be defined by engagement in other members. It may be specified by the case (the same applies to the drive limit on the side opposite to the cavity 107 described later).
  • the pressure of the injection accumulator 39 is also applied to the surge accumulator 63 via the communication passage 43d.
  • the surge accumulator 63 has the same pressure as the pressure at the start of injection of the injection accumulator 39 when the piston 63b is located at the drive limit on the side of the liquid chamber 63c. Therefore, the pressure of the surge accumulator 63 and the pressure of the injection accumulator 39 are generally balanced. As a result, the piston 63b is maintained in a state of being located in the drive limit on the side of the liquid chamber 63c.
  • FIG. 4A shows a state in which the molten metal is filled almost entirely in the cavity 107 after FIG. 3A. At this time, the pressure of the molten metal rises when the plunger 21 pushes the molten metal that has lost the escape place. The inertial force of the plunger 21 exerts an impact on the molten metal, which may cause a so-called surge pressure.
  • the pressurizing member 49 receives pressure from the molten metal and moves in the direction of retracting from the cavity 107.
  • the pressurizing piston 55 moves to the side of the head side chamber 53h, and the hydraulic fluid in the head side chamber 53h is discharged to the communication passage 43d.
  • This hydraulic fluid flows into the surge accumulator 63.
  • the surge pressure is absorbed.
  • the pressurizing member 49 may or may not reach the drive limit on the opposite side of the cavity 107 (illustrated example).
  • FIG. 5 (a) shows a state in which the pressure increase (pressure increase step) is performed after FIG. 4 (a).
  • the pressure increasing step the hydraulic fluid is supplied from the injection accumulator 39 to the rear chamber 31d of the injection cylinder 27.
  • a pressure higher than the pressure of the injection accumulator 39 is applied to the head side chamber 31h of the injection cylinder 27 by the pressure increasing action of the pressure increasing piston 35.
  • the pressure applied to the molten metal in the cavity 107 by the plunger 21 increases.
  • the pressure of the head side chamber 31h which is higher than the pressure of the injection accumulator 39, is also applied to the head side chamber 53h of the pressurizing cylinder 51 via the communication passage 43d.
  • the pressurizing member 49 moves toward the cavity 107 and applies pressure to the molten metal. That is, local pressurization is performed.
  • FIG. 6 is a timing chart for explaining the details of the operation related to the injection and the local pressurization as described above.
  • the horizontal axis indicates time t.
  • the solid line Lv indicates the change in the injection speed (the speed of the plunger 21)
  • the broken line Lp indicates the change in the injection pressure (for example, the pressure applied to the molten metal by the plunger 21).
  • the vertical axis indicates the magnitudes of the injection speed V and the injection pressure P.
  • the injection device 9 performs low-speed injection (time point t0 to t1), high-speed injection (time point t1 to t3), pressure increase (time point t4 to t5), and pressure holding (time point t5 to t6) in order. That is, in the initial stage of injection, the injection device 9 performs low-speed injection in which the plunger 21 is advanced at a relatively low speed (speed VL ) from the viewpoint of preventing the entrainment of air in the molten metal. Next, the injection device 9 performs high-speed injection in which the plunger 21 is advanced at a relatively high speed (speed VH ) from the viewpoint of filling the molten metal without delaying the solidification of the molten metal.
  • speed VL relatively low speed
  • speed VH relatively high speed
  • the injection device 9 increases the molten metal in the cavity 107 to the casting pressure PE by the force in the forward direction of the plunger 21. After that, the injection device 9 performs holding pressure to maintain the casting pressure PE . Specifically, it is as follows.
  • the injection cylinder 27 is in the state shown in FIG. That is, the injection piston 33 and the pressure boosting piston 35 are located at initial positions such as the retreat limit. Further, the injection accumulator 39 has been filled (accumulated) with the hydraulic fluid.
  • the check valves 45A and 45B and the flow control valve 47 are closed, for example.
  • the switching valve 61 may be closed or open. In the following, it is assumed that the switching valve 61 is always open, and the description of the operation of the switching valve 61 will be omitted.
  • the pressure piston 55 may be set at any position as the initial position, but is located at the forward limit as shown in FIG. 2, for example.
  • the piston 63b of the surge accumulator 63 is located, for example, in the drive limit on the side of the liquid chamber 63c.
  • the control device 5 determines whether or not the predetermined injection start condition is satisfied.
  • the injection start condition may be, for example, that the mold clamping of the fixed mold 103 and the mobile mold 105 is completed and the information indicating that the molten metal has been supplied to the sleeve 19 is obtained. Then, when the control device 5 determines that the injection start condition is satisfied, the control device 5 starts injection (low-speed injection).
  • control device 5 opens the check valve 45A. As a result, the hydraulic fluid is supplied from the injection accumulator 39 to the head side chamber 31h. Further, the control device 5 opens the flow rate control valve 47. As a result, the hydraulic fluid is allowed to be discharged from the rod side chamber 31r. Then, the injection piston 33 advances while discharging the hydraulic fluid of the rod side chamber 31r by the pressure received from the head side chamber 31h. As a result, the operation described with reference to FIGS. 3 (a) and 3 (b) is realized.
  • the speed of the plunger 21 is controlled by adjusting the flow rate of the hydraulic fluid discharged from the rod side chamber 31r by the flow rate control valve 47.
  • the control device 5 feedback-controls the opening degree of the flow rate control valve 47 so that the speed of the plunger 21 detected by the position sensor (not shown) converges to the target speed.
  • This feedback control may be, for example, the feedback control of the speed itself, or the substantial speed realized by the feedback control of the position performed so that the position of the detected plunger 21 becomes the target position every moment. It may be feedback control of.
  • the speed of the plunger 21 is, for example, low (for example, less than 1 m / s) and constant. However, multi-stage control of the speed of the plunger 21 may be performed.
  • the control device 5 increases the opening degree of the flow rate control valve 47, increases the flow rate of the hydraulic fluid discharged from the rod side chamber 31r, and increases the speed of the plunger 21.
  • the control at this time may be the same as the control at the time of low-speed injection, except that the target speed is different, for example.
  • the high-speed start condition may be, for example, that the position of the plunger 21 has reached a predetermined high-speed switching position.
  • control device 5 may determine whether or not the detection position of the plunger 21 has reached the high-speed switching position and switch the target speed, or the control device 5 may switch the target speed every moment set based on the high-speed switching position and the target speed. It may only achieve the target position.
  • Deceleration injection t3 to t4
  • the plunger 21 receives a reaction force from the filled molten metal and is decelerated, while the injection pressure rises sharply.
  • the operation of each part is the same as that at the time of high-speed injection.
  • deceleration control may be performed to reduce the opening degree of the flow rate control valve 47. By such deceleration control, for example, the surge pressure is reduced.
  • the surge accumulator 63 can absorb all the hydraulic fluid discharged from the head side chamber 53h.
  • the piston 63b may be located in the drive limit on the opposite side of the liquid chamber 63c, as shown in FIG. 4A. In the communication passage 43d, the transmission of pressure to the injection cylinder 27 side from the surge accumulator 63 is reduced by the check valve 45C (and the throttle valve 59B).
  • the hydraulic fluid absorbed by the surge accumulator 63 can escape to the injection cylinder 27 side via the throttle valve 59B.
  • the pressure in the head side chamber 31h of the injection cylinder 27 increases due to the pressure increase described below, the amount can be limited. Therefore, for example, as shown in FIG. 4A, the piston 63b located in the drive limit on the side opposite to the liquid chamber 63c can easily hold the position.
  • the control device 5 opens the check valve 45B when a predetermined pressure increase start condition is satisfied.
  • the pressure increase start condition is, for example, an injection pressure based on a detection value of a pressure sensor (not shown) that detects the pressure of the head side chamber 31h (and a pressure sensor (not shown) that detects the pressure of the rod side chamber 31r if necessary).
  • the pressure of the plunger 21 has been reached, or the detection position of the plunger 21 detected by the position sensor (not shown) has reached a predetermined position.
  • the check valve 45B When the check valve 45B is opened, the hydraulic fluid is supplied from the injection accumulator 39 to the rear concubine 31d. Then, the pressure in the head side chamber 31h rises above the pressure in the injection accumulator 39 due to the pressure increasing action of the pressure increasing piston 35, and the check valve 45A self-closes. As a result, as described with reference to FIGS. 5 (a) and 5 (b), the pressure is increased and the local pressurization is performed.
  • the check valve 45A may be closed by the introduction of pilot pressure instead of self-closing.
  • the control device 5 has a detection value (injection pressure) of a pressure sensor (not shown) that detects the pressure of the head side chamber 31h (and a pressure sensor (not shown) that detects the pressure of the rod side chamber 31r if necessary). Pressure control is performed based on the detected value). The timing may be different between the start of pressure control and the start of supply of the hydraulic fluid to the rear chamber 31d.
  • the control device 5 feedback-controls the flow rate control valve 47 so that the detected value of the injection pressure rises along a predetermined step-up curve, for example. After that, the injection pressure reaches the casting pressure PE (final pressure).
  • the pressure in the head side chamber 31h of the injection cylinder 27 pressurized by the pressure boosting piston 35 is transmitted to the head side chamber 53h of the pressure cylinder 51 via the communication passage 43d. At this time, the pressure transmission is delayed by the throttle valve 59A. Thereby, for example, the pressurization of the molten metal by the plunger 21 can be started promptly.
  • the piston 63b may be located at or near the drive limit on the opposite side of the liquid chamber 63c. Therefore, the probability that the pressure in the head side chamber 31h of the injection cylinder 27 pressurized by the pressure boosting piston 35 is absorbed by the surge accumulator 63 is reduced. Therefore, for example, local pressurization can be started quickly.
  • the control device 5 determines that the molten metal has solidified (time point t6), the control device 5 controls the hydraulic pressure device 29 so as to end the holding pressure. For example, the control device 5 closes the check valve 45A and prohibits the flow of the hydraulic fluid from the injection accumulator 39 to the rear side chamber 31b, or closes the flow rate control valve 47 and prohibits the outflow of the hydraulic fluid from the rod side chamber 31r. To do.
  • the control device 5 may appropriately determine whether or not the molten metal has solidified. For example, the control device 5 determines whether or not the molten metal has solidified depending on whether or not a predetermined time has elapsed from a predetermined time point such as t5 when the final pressure is obtained.
  • the control device 5 controls the mold clamping device 7 so as to move the mobile mold 105 away from the fixed mold 103 to open the mold.
  • the molded product formed by solidifying the molten metal separates from one of the fixed mold 103 and the mobile mold 105 and remains in the other mold.
  • the control device 5 controls the extrusion device (not shown) so as to extrude the molded product from the other mold.
  • the control device 5 When the molded product is separated from the fixed mold 103 as the other mold by opening the mold by the mold clamping device 7, or when the molded product is pushed out from the fixed mold 103 as the other mold by the extruder, the control device 5 is used.
  • the injection device 9 may be controlled so as to perform an operation of pushing out the molded product from the fixed mold 103 (hereinafter, may be referred to as “protruding operation”) by the plunger 21 and the pressurizing member 49.
  • control device 5 opens the check valve 45A and the flow rate control valve 47 in the same manner as when the pressure is increased. As a result, the molded product is pushed by the plunger 21 and the pressure member 49 as in the case of pressure increase.
  • control at this time may be speed control or pressure control.
  • the control device 5 detects the plunger 21 (and / or the pressurizing member 49) so that the speed of the plunger 21 becomes the same as the speed of the mobile 105 or the speed of the extrusion pin of the extruder (not shown). The speed may be controlled based on the speed of.
  • control device 5 performs an operation for returning to the initial state. For example, the injection piston 33 and the pressure boosting piston 35 are retracted, and the injection accumulator 39 is filled. These operations may be in various modes including known operations.
  • control device 5 supplies the hydraulic fluid from a pump (not shown) to the rod concubine 31r in a state where the hydraulic fluid is allowed to be discharged from the head concubine 31h, and retracts the injection piston 33.
  • the hydraulic fluid discharged from the head side chamber 31h may be discharged to the injection accumulator 39 or may be discharged to the tank 41.
  • the control device 5 supplies the hydraulic fluid from the pump (not shown) to the rod concubine 31r in a state where the hydraulic fluid from the head concubine 31h is prohibited (from another viewpoint, the injection piston 33 is retracted).
  • the pressure boosting piston 35 retracts.
  • the hydraulic fluid is supplied from a pump (not shown) to the head side chamber 31h (or the front chamber 31a if necessary) in a state where the discharge of the hydraulic fluid from the rod side chamber 31r is prohibited.
  • the pressure boosting piston 35 retracts.
  • the hydraulic fluid discharged from the rear side chamber 31d as the pressure boosting piston 35 retracts may be discharged to the injection accumulator 39 or may be discharged to the tank 41.
  • Pressurization of the hydraulic fluid in the head side chamber 31h by the pressure boosting piston 35 (in another viewpoint, the pressure holding step) is completed, and the pressure in the head side chamber 31h (in another viewpoint, the pressure in the communication passage 43d) is applied to the injection accumulator 39.
  • the hydraulic fluid is discharged from the liquid chamber 63c of the surge accumulator 63.
  • the piston 63b is located at the initial position (for example, the drive limit on the side of the liquid chamber 63c).
  • the pressure piston 55 receives the pressure of the hydraulic fluid in the communication passage 43d continuously from the protruding operation, and is maintained in a state of being located in the drive limit on the side of the cavity 107.
  • the injection device 9 has an injection cylinder 27 and a hydraulic pressure device 29.
  • the injection cylinder 27 is connected to a plunger 21 that injects the molding material into the cavity 107.
  • the hydraulic pressure device 29 communicates with the injection cylinder 27 and the pressure cylinder 51.
  • the pressurizing cylinder 51 is connected to a pressurizing member 49 that locally pressurizes the molding material filled in the cavity 107.
  • the injection cylinder 27 has an injection piston 33 connected to the plunger 21 and a cylinder member 31 slidably accommodating the injection piston 33.
  • the cylinder member 31 has a head side chamber 31h on which the pressure of the hydraulic fluid is applied to the surface of the injection piston 33 opposite to the plunger 21.
  • the hydraulic pressure device 29 has a communication passage 43d.
  • the communication passage 43d communicates the head side chamber 31h with the first chamber (head side chamber 53h) of the pressure cylinder 51.
  • the head side chamber 53h is a cylinder chamber to which a hydraulic fluid is supplied when the pressurizing member 49 is advanced toward the cavity 107.
  • the molding machine (die casting machine 1) has the above-mentioned injection device 9 and the mold clamping device 7.
  • the mold clamping device 7 holds the mold (mold 101) constituting the cavity 107.
  • the mold-molding machine (die-casting machine DC1) includes the above-mentioned molding machine (die-casting machine 1), the above-mentioned mold (die 101), and the mold 101. It has a pressurizing member 49 arranged and a pressurizing cylinder 51 arranged in the mold 101.
  • the injection step (FIG. 3 (a), FIG. 4 (a) and FIG. 5 (a)) in which injection (injection in a broad sense) is performed by the injection device 9 as described above. ))
  • the pressure applied to the hydraulic fluid in the head side chamber 31h of the injection cylinder 27 is applied to the hydraulic fluid in the head side chamber 31h of the injection cylinder 27 via the communication passage 43d during at least a part of the period from the start of injection to the completion of holding pressure (the entire period in this embodiment). It is also applied to the hydraulic fluid in one chamber (head side chamber 53h of the pressure cylinder 51).
  • the pressure of the head side chamber 53h may be increased to perform local pressurization.
  • the local pressurization is automatically performed according to the timing at which the pressure increase by the plunger 21 is started, and the control is also simplified.
  • the pressurizing member 49 can be moved to the cavity 107 side when the hydraulic fluid is supplied to the head side chamber 31h and injection is performed. ..
  • the pressurizing member 49 can be retracted and the surge pressure can be released to the communication passage 43d via the pressurizing cylinder 51.
  • the area ratio S4 / S3 may be 0.5 times or more and 1.5 times or less with respect to the area ratio S2 / S1.
  • the area ratio S4 / S3 is driven by one pressurizing cylinder 51 with respect to the area (S3) in which the pressurizing piston 55 receives pressure from the hydraulic fluid in the first chamber (head side chamber 53h). It is a ratio of the total area (S4) in which the pressure member 49 applies pressure to the molding material of the cavity 107.
  • the area ratio S2 / S1 is the ratio of the area (S2) at which the plunger 21 applies pressure to the molding material of the cavity 107 with respect to the area (S1) at which the injection piston 33 receives pressure from the hydraulic fluid in the head side chamber 31h.
  • the pressure applied to the molten metal by the pressurizing member 49 becomes close to the pressure applied to the molten metal by the plunger 21.
  • the probability that the pressure of local pressurization will be too small or too large will be reduced.
  • the quality of the molded product is improved.
  • the local pressurization contributes to applying a uniform pressure over the entire molded product, rather than increasing the pressure in the portion where the sink mark is likely to occur. From this point of view, the quality of the molded product is improved.
  • the surge pressure generated in the molten metal is applied to the plunger 21 and the pressurizing member 49, the difference between the pressure of the hydraulic fluid on the pressurizing cylinder 51 side and the pressure of the hydraulic fluid on the injection cylinder 27 side is The probability of becoming large is reduced. As a result, for example, the probability of unintended behavior occurring is reduced.
  • the area ratio S4 / S3 may be 1.0 times or more and 1.2 times or less with respect to the area ratio S2 / S1.
  • the ratio of S4 / S3 to S2 / S1 is closer to 1.0 as compared with the above range of 0.5 times or more and 1.5 times or less, so that it is 0.5 times or more and 1.5 times or more.
  • the above-mentioned effects described for the range of double or less are improved.
  • the pressure of the plunger 21 is less likely to be transmitted to the molten metal at a position away from the plunger 21 (for example, overflow 107b).
  • the applicant of the present application has obtained an experimental result that only about 80% of the pressure applied to the molten metal by the plunger 21 is transmitted to the molten metal at a position away from the sleeve 19.
  • the ratio of S4 / S3 and S2 / S1 is set in the above range, and the pressure applied to the molten metal by the pressurizing member 49 is equal to or higher than the pressure applied to the molten metal by the plunger 21 to make the molten metal equal to or higher than the pressure applied to the molten metal.
  • the effect of evenly pressurizing is improved.
  • the injection device 9 may have a throttle valve 59A which is located in the communication passage 43d and whose opening degree is constant over the molding cycle.
  • the transmission of pressure from the injection accumulator 39 or the injection cylinder 27 to the pressure cylinder 51 can be delayed.
  • the possibility that the pressure escapes to the pressure cylinder 51 and the control delay becomes large is reduced.
  • the possibility that the pressure escapes to the pressure cylinder 51 and the control delay becomes large is reduced.
  • the hydraulic fluid in the head side chamber 31h is pressurized by the pressure increasing piston 35 to start the pressure increasing, the possibility that the pressure escapes to the pressure cylinder 51 and the control delay becomes large is reduced.
  • the opening degree of the throttle valve 59A is higher than that in a mode in which the cross-sectional area of a part of the communication passage 43d is reduced (this aspect is also included in the technique according to the present disclosure).
  • the pressurizing member 49 is cavated by the pressure of the first chamber (head side chamber 53h of the pressurizing cylinder 51). It may be located in the drive limit on the 107 side. In this embodiment, the pressurizing member 49 is located in the drive limit on the cavity 107 side from before the time point t0. In addition, for example, the pressurizing member 49 is located in the drive limit on the side of the cavity 107 after the time point t0 and before the time point t1, after the time point t1 and before the time point t2, or after the time point t2 and before the time point t3. You may.
  • the pressure of the molten metal enables the operation of moving the pressurizing member 49 to the side opposite to the cavity 107. That is, the surge pressure of the molten metal can be released to the communication passage 43d via the pressurizing member 49 and the pressurizing cylinder 51, and the surge pressure of the molten metal can be reduced.
  • the injection device 9 may have a surge accumulator 63 that is connected to the first chamber (head side chamber 53h of the pressure cylinder 51).
  • the surge pressure escaped to the communication passage 43d can be absorbed by the surge accumulator 63.
  • the influence of the surge pressure escaping to the communication passage 43d on the injection cylinder 27 is reduced.
  • the probability that an unintended operation will be performed is reduced.
  • an accumulator for absorbing surge pressure is known, a configuration for absorbing surge pressure via a pressurizing cylinder 51 for local pressurization is new.
  • the pressure is permissible for the pressure to be mutually transmitted between the surge accumulator 63 and the first chamber (head side chamber 53h of the pressure cylinder 51) from before the start of injection to the completion of pressure increase. May be done.
  • Such embodiments include, for example, an embodiment in which a valve is not provided between the surge accumulator 63 and the head concubine 53h, and an embodiment in which a valve is provided, but the valve is opened over one or more molding cycles. Examples are mentioned.
  • the surge accumulator 63 is basically connected to the head side chamber 53h, unlike the injection accumulator 39 in which pressure is mutually transmitted to and from the head side chamber 53h of the pressure cylinder 51 after the start of injection. ing. Therefore, for example, the surge pressure can be reliably absorbed without complicating the control.
  • the surge accumulator 63 may have a liquid chamber 63c communicating with the first chamber (head side chamber 53h of the pressurizing cylinder 51) and a piston 63b receiving the pressure of the hydraulic fluid in the liquid chamber 63c.
  • the maximum change in volume (dV2) of the liquid chamber 63c defined by the movable range of the piston 63b is the maximum change in volume of the head side chamber 53h defined by the movable range of the piston 63b of the pressure cylinder 51. It may be 1.0 times or more and 1.2 times or less with respect to (dV1).
  • the entire amount of the hydraulic fluid discharged from the head side chamber 53h due to the surge pressure can be absorbed by the surge accumulator 63.
  • the surge pressure can be absorbed more reliably.
  • dV2 / dV1 is 1.2 times or less, the amount of the hydraulic fluid absorbed by the surge accumulator 63 when the hydraulic fluid is supplied from the injection cylinder 27 to the head side chamber 53h for local pressurization. Is reduced. As a result, for example, the probability that the local pressurization is excessively delayed with respect to the pressurization by the plunger 21 is reduced.
  • the injection device 9 may have an injection accumulator 39 that supplies a hydraulic fluid to the head side chamber 31h of the injection cylinder 27.
  • the pressure of the surge accumulator 63 when the piston 63b of the surge accumulator 63 is located at the drive limit on the side of the liquid chamber 63c is the pressure at the start of discharge of the injection accumulator 39 (time point t0 in this embodiment). On the other hand, it may be 0.8 times or more and 1.2 times or less.
  • the surge accumulator 63 can maintain the state in which the piston 63b is located at the drive limit on the side of the liquid chamber 63c, the maximum change in volume (dV2) of the volume of the liquid chamber 63c can be used for absorbing the surge pressure.
  • the hydraulic pressure device 29 may have a check valve 45C and a throttle valve 59B.
  • the check valve 45C is located on the side of the head side chamber 31h of the injection cylinder 27 from the position where the surge accumulator 63 is connected in the communication passage 43d, and is the first chamber (pressurization cylinder 51) from the side of the head side chamber 31h. The flow to the side of the head concubine 53h) is allowed, and the flow in the opposite direction is prohibited.
  • the throttle valve 59B bypasses the check valve 45C.
  • the influence of the surge pressure not absorbed by the surge accumulator 63 on the operation of the injection cylinder 27 can be reduced.
  • the hydraulic fluid of the surge accumulator 63 can be flowed to the side of the head side chamber 31h to return the surge accumulator 63 to the initial position. Since the flow rate at this time is limited by the throttle valve 59B, the influence of the surge accumulator 63 on the operation of the injection cylinder 27 is reduced.
  • the injection cylinder 27 may have a pressure boosting piston 35 housed in the cylinder member 31.
  • the pressure boosting piston 35 may have a first surface 35c that receives pressure from the head side chamber 31h and a second surface 35d that receives pressure from the rear chamber 31b on the opposite side.
  • the area of the second surface 35d may be larger than the area of the first surface 35c.
  • the pressure applied to the head side chamber 31h of the injection cylinder 27 is increased by the same pressure from the hydraulic pressure source (in the illustrated example, the injection accumulator 39) and the pressure increasing action of the pressure increasing piston 35.
  • the former pressure can be used for injection by the plunger 21 and the pressurizing member 49 can prepare for surge pressure absorption (advancement of the pressurizing member 49), and the latter pressure can be used to increase the pressure by the plunger 21.
  • local pressurization by the pressurizing member 49 can be performed. That is, while the known pressure-increasing injection cylinder 27 performs the known injection and pressure-increasing operations, it is possible to prepare for surge pressure absorption and perform local pressurization. That is, the effect of simplifying the configuration is improved.
  • FIG. 7 is a diagram showing a configuration of a main part of the die-casting machine DC2 according to the second embodiment, and corresponds to FIG. 2 of the first embodiment.
  • the drive unit 223 of the injection device 209 is different from that of the first embodiment. Specifically, it is as follows.
  • the injection cylinder 27 is a so-called pressure-increasing type having an injection piston 33 and a pressure-increasing piston 35.
  • the injection cylinder 227 has an injection piston 33 and does not have a pressure boosting piston 35, that is, a so-called single cylinder type.
  • the cylinder member 231 of the injection cylinder 227 has a configuration in which the large-diameter cylinder 31y is substantially removed from the cylinder member 31 of the first embodiment and the rear end of the small-diameter cylinder 31x is closed, and the rod side chamber 31r and the head side chamber 31h are configured. And does not have an anterior concubine 31a and a posterior concubine 31b.
  • the hydraulic pressure device 229 of the present embodiment may have an injection accumulator 39A and a pressure increasing accumulator 39B.
  • the injection accumulator 39A and the pressure increasing accumulator 39B may have the same configuration or different configurations from each other.
  • the pressure increasing accumulator 39B may be configured to be capable of accumulating pressure up to a pressure higher than the pressure of the injection accumulator 39A.
  • the single cylinder type injection cylinder 227 may be combined with a hydraulic device having an injection accumulator 39A and not having a pressure increasing accumulator 39B.
  • the injection accumulator 39A is considered to correspond to the injection accumulator 39 of the first embodiment. good.
  • the pressure increasing accumulator 39B is connected to the head side chamber 31h by the flow path 43b.
  • the flow path 43b is provided with a check valve 45B that prohibits and allows the flow of the hydraulic fluid between the pressure increasing accumulator 39B and the head side chamber 31h.
  • the operation of the injection device 209 according to the second embodiment may be substantially the same as the operation of the injection device 9 according to the first embodiment.
  • the hydraulic fluid is supplied from the pressure boosting accumulator 39B to the head concubine 31h.
  • the pressure of the pressure increasing accumulator 39B is higher than the pressure of the injection accumulator 39A. Therefore, the pressure of the head side chamber 31h is further increased by supplying the hydraulic fluid from the accumulator 39A for injection to the head side chamber 31h to perform injection in a narrow sense and then supplying the hydraulic fluid from the pressure increasing accumulator 39B to the head side chamber 31h.
  • the pressure can be increased.
  • the pressure member 49 when the injection is performed in a narrow sense, the pressure member 49 is positioned at the drive limit on the side of the cavity 107 by the pressure of the injection accumulator 39A to prepare for absorption of the surge pressure. It can be performed. Further, when the pressure is increased, the pressure of the pressure increasing accumulator 39B can be used to locally pressurize the pressure member 49.
  • the hydraulic pressure device 229 has a continuous passage 43d.
  • the communication passage 43d communicates the head side chamber 31h of the injection cylinder 27 with the first chamber (head side chamber 53h) of the pressure cylinder 51.
  • the head side chamber 53h is a cylinder chamber to which a hydraulic fluid is supplied when the pressurizing member 49 is advanced toward the cavity 107.
  • the same effect as that of the first embodiment is achieved.
  • the pressure of the head side chamber 31h is increased to increase the pressure
  • the pressure of the head side chamber 53h can be increased to perform local pressurization. Therefore, the appropriate timing is achieved while simplifying the configuration and control. Local pressurization can be performed with.
  • the hydraulic pressure device 229 may have an injection accumulator 39A, a pressure increasing accumulator 39B, and a hydraulic pressure circuit 243.
  • the injection accumulator 39A and the pressure increasing accumulator 39B are connected to the head side chamber 31h of the injection cylinder 227, respectively.
  • the hydraulic circuit 243 controls the flow of the hydraulic fluid from the injection accumulator 39A and the pressure increasing accumulator 39B to the head concubine 31h.
  • the control device 5 (see FIG. 1) supplies the hydraulic fluid from only the former of the injection accumulator 39A and the pressure increasing accumulator 39B to the head side chamber 31h to inject the molding material into the cavity 107, and then the pressure increasing accumulator 39B.
  • the hydraulic fluid circuit 243 may be controlled so as to supply the hydraulic fluid from the head side chamber 31h to increase the pressure of the molding material in the cavity 107.
  • two types of pressure can be applied to the head side chamber 31h as in the case of using the pressure boosting type injection cylinder 27.
  • the pressure boosting type injection cylinder 27 in addition to the operation of injection and pressure increase by the plunger 21, preparation for absorption of surge pressure by the pressurizing member 49 and local pressurization by the pressurizing member 49 can be performed. can.
  • a high casting pressure can be obtained while using the single cylinder type injection cylinder 227.
  • FIG. 8 is a diagram showing a configuration of a main part of the die-casting machine DC3 according to the third embodiment, and corresponds to FIG. 2 of the first embodiment.
  • some of the reference numerals related to the injection cylinder 27 are omitted as compared with FIG. 2.
  • the drive unit 323 of the injection device 309 is different from that of the first embodiment. Specifically, it is as follows.
  • the drive unit 23 of the injection device 9 was a total hydraulic pressure type.
  • the drive unit may be a hybrid type that combines a hydraulic type and an electric type.
  • FIG. 8 shows an example of a hybrid drive unit.
  • the drive unit 323 exemplified in FIG. 8 has an electric drive device 65.
  • the drive device 65 has, for example, a rotary electric motor 67 and a conversion mechanism 69 that converts the rotation of the electric motor 67 into linear motion (translational motion).
  • the drive device 65 is connected to the plunger 21 (in another aspect, the coupling 25, the piston rod 37 or the injection piston 33) by the connecting portion 71.
  • the electric motor 67 may be a linear motor.
  • the conversion mechanism 69 is a screw mechanism (ball screw mechanism or slip screw mechanism).
  • the conversion mechanism 69 may be of another type such as a rack and pinion mechanism.
  • the drive device 65 may include a gear mechanism and / or a pulley / belt mechanism for transmitting the rotation of the electric motor 67.
  • the connecting portion 71 may connect the drive device 65 and the plunger 21 over one or more molding cycles, and may include an engaging structure and / or a detachable mechanism, and is a part of the molding cycle. In the process of, the drive device 65 and the plunger 21 may be connected to each other.
  • the electric drive device 65 may be appropriately used.
  • the plunger 21 may be driven only by the hydraulic pressure type driving force as in the first embodiment with the connection between the plunger 21 and the driving device 65 being disconnected.
  • the drive device 65 may be connected to the plunger 21 and the plunger 21 may be retracted by the drive force of the drive device 65.
  • the hydraulic fluid discharged from the head side chamber 31h may be filled in the injection accumulator 39.
  • low-speed injection is performed by the drive device 65, after that, the connection between the drive device 65 and the plunger 21 is released, and as in the first embodiment, the hydraulic pressure type driving force is used from high-speed injection to completion of holding pressure.
  • the operation may be performed. In this operation mode, the plunger 21 may or may not be retracted by the drive device 65.
  • the hydraulic pressure device and the hydraulic pressure circuit are designated by the same reference numerals as those in the first embodiment, but the liquid is assigned according to the division of roles of the drive device 65.
  • the configuration of the pressure device and the hydraulic circuit may be modified.
  • the rod side chamber 31r can be opened to the atmosphere, or the piston rod 37 and the injection piston 33 can have the same diameter.
  • the hydraulic pressure device 29 has a continuous passage 43d.
  • the communication passage 43d communicates the head side chamber 31h of the injection cylinder 27 with the first chamber (head side chamber 53h) of the pressure cylinder 51.
  • the head side chamber 53h is a cylinder chamber to which a hydraulic fluid is supplied when the pressurizing member 49 is advanced toward the cavity 107. Therefore, for example, the same effect as that of the first embodiment is obtained.
  • the injection device 309 may have an electric motor 67 connected to the injection piston 33.
  • the burden on the hydraulic drive device can be reduced.
  • energy consumption can be reduced and / or the effect of the hydraulic fluid (oil) on the environment can be reduced.
  • FIG. 9 is a diagram showing a configuration of a main part of the die-casting machine DC4 according to the fourth embodiment, and corresponds to FIG. 2 of the first embodiment.
  • the drive unit 423 of the injection device 409 is different from that of the first embodiment. Specifically, it is as follows.
  • the drive unit 23 of the injection device 9 was a total hydraulic pressure type.
  • the drive unit may be fully electric.
  • Various configurations have been proposed so far for the fully electric drive unit, and any of them may be applied, or a new configuration may be applied.
  • FIG. 9 shows an example of a fully electric drive unit.
  • the drive unit 423 illustrated in FIG. 9 has an electric drive device 73 in addition to the electric drive device 65 shown in the third embodiment (FIG. 8).
  • the drive device 73 has, for example, a rotary electric motor 75 and a conversion mechanism 77 that converts the rotation of the electric motor 75 into a linear motion (translational motion).
  • the description of the configuration of the drive device 65 may be incorporated into the configuration of the drive device 73 as long as there is no contradiction or the like.
  • the injection cylinder 427 has a pressure boosting member 435 corresponding to the pressure boosting piston 35 of the first embodiment.
  • the pressure boosting member 435 is connected to the drive device 73 and is driven by an electric driving force to pressurize the hydraulic fluid in the head side chamber 31h.
  • the pressure increasing member 435 does not have the small diameter piston 35x and the large diameter piston 35y, and does not have the effect of increasing the pressure of the rear side chamber 31d and transmitting it to the head side chamber 31h.
  • the pressure boosting member 435 may slide on the cylinder member 431, or may have a diameter smaller than the inner diameter of the cylinder member 431.
  • the hydraulic pressure device 429 has, for example, a flow path (reference numeral omitted) connecting the head side chamber 31h and the tank 41, and a check valve 45D located in the flow path.
  • the check valve 45D is opened by the introduction of the pilot pressure, and when the pilot pressure is not introduced, the flow of the hydraulic fluid from the tank 41 to the head concubine 31h is allowed to flow, and the flow on the opposite side thereof is prohibited.
  • the rod side chamber 31r and the rear side chamber 31d may be open to the atmosphere or may be filled with a hydraulic fluid. However, the head side chamber 31h is filled with the hydraulic fluid.
  • Injection in a narrow sense from the start of injection to before the start of pressure increase may be performed by advancing the injection piston 33 by the drive device 65.
  • the head side chamber 31h whose volume is expanded may be replenished with the hydraulic fluid from the tank 41 via the check valve 45D.
  • the hydraulic fluid may be replenished by a pump (not shown).
  • the pressure boosting may be performed by advancing the pressure boosting member 435 by the drive device 73 and pressurizing the hydraulic fluid in the head side chamber 31h.
  • the flow of the hydraulic fluid from the head side chamber 31h to the tank 41 may be prohibited by the check valve 45D.
  • the hydraulic pressure device 429 has a continuous passage 43d.
  • the communication passage 43d communicates the head side chamber 31h of the injection cylinder 427 with the first chamber (head side chamber 53h) of the pressure cylinder 51.
  • the head side chamber 53h is a cylinder chamber to which a hydraulic fluid is supplied when the pressurizing member 49 is advanced toward the cavity 107. Therefore, for example, the same effect as that of the first embodiment is obtained.
  • each of the die casting machines DC1 to DC4 with a mold is an example of a mold molding machine.
  • the die casting machine 1 and the like included in these are examples of molding machines.
  • the head side chamber 53h of the pressure cylinder 51 is an example of the first chamber.
  • the piston 63b is an example of a surge piston.
  • the molding machine is not limited to the die casting machine.
  • the molding machine may be another metal molding machine, an injection molding machine for molding a resin, or a molding machine for molding a material obtained by mixing wood powder with a thermoplastic resin or the like.
  • the molding machine is not limited to the horizontal clamping horizontal injection, and may be, for example, a vertical clamping vertical injection, a vertical clamping horizontal injection, or a horizontal clamping vertical injection.
  • the die casting machine is not limited to the cold chamber machine, and may be, for example, a hot chamber machine.
  • the hydraulic fluid is not limited to oil, and may be, for example, water.
  • the pressure-increasing accumulator of the second embodiment that supplies the hydraulic fluid to the rear chamber of the pressure-increasing injection cylinder may be provided.
  • the drive device 65 shown in the third embodiment may be applied to the second embodiment (a configuration having an injection accumulator and a pressure increasing accumulator leading to a head concubine).
  • the injection cylinder 427 of the fourth embodiment (a pressure boosting member 435 instead of the pressure boosting piston 35) is provided in place of the injection cylinder 27, and the injection accumulator 39 is provided.
  • a hybrid injection device having the drive devices 65 and 73 may be configured.
  • the injection is not limited to those including low-speed injection and high-speed injection, and may be, for example, those that perform laminar flow filling at low speed.
  • the pressure-increasing cylinder may be one in which the cylinder member accommodating the injection piston and the cylinder member accommodating the pressure-increasing piston are separated from each other and connected by a flow path.
  • each valve is named by the name of the valve type (check valve, switching valve) exemplified in the figure.
  • each valve may be a valve other than the type used for the designation.
  • the pressurizing member for local pressurization may also be used as an extrusion pin for extruding a molded product formed by solidifying the molding material from the mold.
  • the extrusion cylinder as the pressure cylinder and the injection cylinder may be communicated with each other.
  • this concept a concept characterized by absorbing surge pressure via a pressure cylinder
  • a hydraulic device in another aspect, a pressurizing device, an injection device, a molding machine or a molded molding connected to a pressurizing member connected to a pressurizing member that locally pressurizes the molding material filled in the cavity. Machine
  • It has a surge accumulator leading to a first chamber to which a hydraulic fluid is supplied when the pressurizing member of the pressurizing cylinder is advanced toward the cavity. It is permissible for pressure to be mutually transmitted between the surge accumulator and the first chamber during the period from before the molding material reaches the pressure member until the molding material is filled in the cavity.
  • the hydraulic pressure device to be.
  • the tolerance of pressure transmission between the surge accumulator and the first chamber may be realized by not providing a valve or opening the valve.
  • Concept 1 identifies the difference between a surge accumulator and another accumulator (eg, an injection accumulator) in terms of the action of pressure.
  • the difference between the surge accumulator and the other accumulator (in other words, the difference between the present concept and the prior art) may be specified. From such a viewpoint, for example, the maximum amount of change in the volume of the liquid chamber of the surge accumulator, the pressure of the surge accumulator, the valve connected to the surge accumulator, and / or connected to the surge accumulator.
  • the viewpoint of the structure of the flow path (for example, the bypass flow path) can be mentioned.
  • the concept (the present concept) characterized by absorbing surge pressure through the pressure cylinder is such that the first chamber of the pressure cylinder and the head side chamber of the injection cylinder communicate with each other as shown in the embodiment of the present disclosure. It may be applied to the configuration in which the first chamber and the head side chamber are not communicated with each other, unlike the embodiment of the present disclosure. As the latter configuration, for example, a configuration in which the hydraulic system for driving the pressure cylinder and the hydraulic system for driving the injection cylinder are not connected at all can be mentioned.

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  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
PCT/JP2021/047246 2020-12-25 2021-12-21 射出装置、成形機、型付成形機及び成形方法 WO2022138621A1 (ja)

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CN202180079392.3A CN116583365A (zh) 2020-12-25 2021-12-21 射出装置、成形机、带模具成形机以及成形方法
MX2023007250A MX2023007250A (es) 2020-12-25 2021-12-21 Dispositivo de inyeccion, maquina de moldeo, maquina de moldeo con troquel y metodo de moldeo.

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JP2020216412A JP7080963B1 (ja) 2020-12-25 2020-12-25 射出装置、成形機、型付成形機及び成形方法
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63212057A (ja) * 1987-02-26 1988-09-05 Honda Motor Co Ltd ダイカスト法
JPH0222252U (zh) * 1988-07-26 1990-02-14
JPH0248261U (zh) * 1989-08-31 1990-04-03
JP2020142245A (ja) * 2019-03-04 2020-09-10 芝浦機械株式会社 射出装置及び成形機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63212057A (ja) * 1987-02-26 1988-09-05 Honda Motor Co Ltd ダイカスト法
JPH0222252U (zh) * 1988-07-26 1990-02-14
JPH0248261U (zh) * 1989-08-31 1990-04-03
JP2020142245A (ja) * 2019-03-04 2020-09-10 芝浦機械株式会社 射出装置及び成形機

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