Injection device, molding machine, mold molding machine, and molding method

Abstract

A hydraulic device (29) communicates with an injection cylinder (27) and a pressurizing cylinder (51). The pressurizing cylinder (51) is linked to a pressurizing member (49) that locally pressurizes a molding material filled in a cavity (107). The injection cylinder (27) has an injection piston (33) linked to a plunger (21) and a cylinder member (31) that slidably houses the injection piston (33). The cylinder member (31) has a head side chamber (31h) that allows a pressure of a working fluid to act on a side of the injection piston (33) opposite the plunger (21). The hydraulic device (29) has a communication passage (43d). The communication passage (43d) communicates the head side chamber (31h) and a head side chamber (53h) of the pressurizing cylinder (51). The head side chamber (53h) is a cylinder chamber to which the working fluid is supplied when the pressurizing member (49) advances toward the cavity (107).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an injection device, a molding machine including the injection device, a die molding machine including the molding machine, and a molding method using the injection device. The molding machine is a die casting machine that molds a metal, for example, or an injection molding machine that molds a resin. BACKGROUND

[0002] In a molding method such as a die casting method, a technique capable of performing so-called partial pressurization is known (for example, Patent Documents 1 to 3). In this technique, after a molding material is filled into a cavity constituted by a mold, the molding material is pressed by a pressurizing pin inserted through the mold. Thereby, a cavity caused by, for example, solidification shrinkage of the molding material is reduced. The pressurizing pin is driven by a pressurizing cylinder (a hydraulic cylinder), for example.

[0003] In Patent Document 1, a technique in which a pressurizing cylinder is communicated with an injection cylinder is disclosed. The injection cylinder is a hydraulic cylinder that drives a plunger that presses a melt in a sleeve into a cavity. The injection cylinder has an injection piston coupled to the plunger, and a cylinder body member that houses the injection piston. The inside of the cylinder body member is divided into a rod-side chamber on the plunger side and a head-side chamber on the opposite side by the injection piston. In Patent Document 1, the rod-side chamber is communicated with the pressurizing cylinder.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-16141

[0007] Patent Document 2: Japanese Patent Application Publication No. 2016-196009

[0008] Patent Document 3: Japanese Patent Application Publication No. 2002-210550 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] Various structures have been proposed regarding a drive device for driving a pressurizing member (a pressurizing pin) and an operation thereof, including the contents described in the above-described patent documents. The various drive devices and / or operations have advantages and disadvantages when compared with each other. On the other hand, users require different performances of the drive device for the pressurizing member. Thus, a new drive device for driving the pressurizing member is proposed, and it is preferable to achieve diversification of the technology.

[0011] TECHNICAL SOLUTION FOR SOLVING THE PROBLEMS

[0012] One aspect of the injection device disclosed herein includes an injection cylinder and a hydraulic device. The injection cylinder is connected to a plunger that injects molding material into a chamber. The hydraulic device is in communication with both the injection cylinder and a pressurizing cylinder. The pressurizing cylinder is connected to a pressurizing component that locally pressurizes the molding material filling the chamber. The injection cylinder has an injection piston connected to the plunger and a cylinder body component that slidably receives the injection piston. The cylinder body component has a head chamber that applies pressure of working fluid to a side of the injection piston opposite to the plunger. The hydraulic device has a connecting passage. The connecting passage connects the head chamber to a first chamber. The first chamber is supplied with working fluid when the pressurizing component of the pressurizing cylinder advances toward the chamber.

[0013] One aspect of the molding machine disclosed herein includes the aforementioned injection device and a mold closing device for holding the mold constituting the cavity.

[0014] One aspect of the present disclosure is a forming machine with a mold, comprising: the forming machine described above; the mold; the pressure member disposed on the mold; and the pressure cylinder disposed on the mold.

[0015] One aspect of the forming method disclosed herein includes an injection step that involves injection using the aforementioned injection device. During this injection step, for at least a portion of the period from the start of injection to the completion of pressure holding, pressure is also supplied to the working fluid in the head chamber via the communication path to the working fluid in the first chamber.

[0016] Invention Effects

[0017] Based on the above configuration or sequence, a new injection device, molding machine, molding machine with mold, and molding method are provided that utilize the pressure of the head side chamber of the injection cylinder to drive the pressurizing component. Attached Figure Description

[0018] Figure 1 This is a side view showing the configuration of the main parts of the die-casting machine according to the first embodiment.

[0019] Figure 2 It means Figure 1 A circuit diagram showing the main components of the localized pressurization system in a die-casting machine.

[0020] Figure 3 (a) in the text refers to Figure 1 A schematic diagram illustrating the injection process of a die-casting machine. Figure 3 (b) is Figure 3 Enlarged view of region IIIb in (a).

[0021] Figure 4 (a) in the text refers to Figure 1 A schematic diagram illustrating the action of a die-casting machine when filling is complete.Figure 4 (b) is an enlarged view of the region IVb of (a). Figure 4 (b) is an enlarged view of the region IVb of (a).

[0022] Figure 5 (b) is an enlarged view of the region IVb of (a). Figure 1 (b) is an enlarged view of the region IVb of (a). Figure 5 (b) is an enlarged view of the region IVb of (a). Figure 5 (b) is an enlarged view of the region IVb of (a).

[0023] Figure 6 (b) is an enlarged view of the region IVb of (a). Figure 1 (b) is an enlarged view of the region IVb of (a).

[0024] Figure 7 (b) is an enlarged view of the region IVb of (a).

[0025] Figure 8 (b) is an enlarged view of the region IVb of (a).

[0026] Figure 9 (b) is an enlarged view of the region IVb of (a). DETAILED DESCRIPTION

[0027] Hereinafter, a plurality of embodiments of the present disclosure will be described with reference to the drawings. Note that in the description of the embodiments other than the first embodiment, basically only the points of difference from the previously described embodiment will be described. As for matters not specifically mentioned, the same as the previously described embodiment can also be inferred from the previously described embodiment. Also, for the configurations corresponding to each other among the plurality of embodiments, even if there are points of difference, sometimes the same reference signs are attached to each other for convenience.

[0028] <First Embodiment>

[0029] (Overall configuration of die casting machine)

[0030] Figure 1 (b) is an enlarged view of the region IVb of (a). Figure 1 (b) is an enlarged view of the region IVb of (a). Figure 1 (b) is an enlarged view of the region IVb of (a).

[0031] The die casting machine DC1 has a die 101, and a die casting machine 1 that holds the die 101. The die casting machine 1 is configured as a device that manufactures a product (molded product, die casting product) of a solidified molded material by injecting (filling) a molded material in a molten state into the inside (chamber 107) of the die 101.

[0032] The molding material is, for example, a metal such as aluminum. The metal in a molten state is sometimes referred to as a melt. Note that, instead of the molding material in a molten state, a molding material in a solid-liquid coexisting state (semi-solid state or semi-molten state) can be injected into the cavity 107.

[0033] The mold 101 has, for example, a stationary mold 103 and a movable mold 105 that opposes the stationary mold 103. The cavity 107 into which the molding material is injected is formed between the stationary mold 103 and the movable mold 105. The stationary mold 103 is a mold that does not move. The movable mold 105 is a mold that moves in a direction (mold opening and closing direction) that opposes the stationary mold 103. The mold opening and closing direction is, for example, the horizontal direction. In the mold opening and closing direction, the movable mold 105 moves toward the stationary mold 103 to close the mold, and moves away from the stationary mold 103 to open the mold. Figure 1 In FIGS. 1 to 3, for convenience, the cross section of the stationary mold 103 or the movable mold 105 is indicated by a single hatching. However, these molds can be directly engraved, or can be sub-molded. In addition, the stationary mold 103 and / or the movable mold 105 can include a mold holder.

[0034] The die casting machine 1 has a machine main body 3 that can perform mechanical operations, and a control device 5 that controls the machine main body 3. The machine main body 3 has, for example, a mold opening and closing device 7 that can perform mold opening and closing and mold clamping of the mold 101, an injection device 9 that injects a melt into the cavity 107, and a non-illustrated ejection device that ejects a product formed by solidification of the melt from the stationary mold 103 or the movable mold 105. Note that the control device 5 can also be a constituent element of the injection device 9.

[0035] The die casting machine with mold DC1 has a pressurizing device LM1 (reference numeral Figure 2 ) that can locally pressurize the melt filled in the cavity 107. However, the hydraulic system of the pressurizing device LM1 is connected to and / or shared with the hydraulic system of the injection device 9, and the pressurizing device LM1 is not necessarily clearly distinguished from the injection device 9. In the following description, the constituent elements of the pressurizing device LM1 are sometimes also described as constituent elements of the injection device 9.

[0036] In the die casting machine with mold DC1, the constitution and operation of devices other than the pressurizing device LM1 (or a part of the injection device 9 in another viewpoint) can be in a known manner, or in a new manner, in other words, in various manners. Note that, for the constitution and operation that can be constituted in a known manner, the description is appropriately omitted. Hereinafter, first, a brief description will be given of the mold opening and closing device 7, the injection device 9, and the control device 5. Next, a brief description will be given of the parts in the hydraulic system of the injection device 9 that can be constituted in the same manner as in the known constitution. After that, the pressurizing device LM1 will be described.

[0037] The mold closing device 7 includes, for example, a frame 11, a fixed template 13 fixed to the frame 11, a movable template 15 movable on the frame 11 in the mold opening and closing direction, and multiple (e.g., four) connecting rods 17 inserted into these templates. The fixed template 13 and the movable template 15 are opposite to each other in the mold opening and closing direction. The fixed template 13 holds the fixed mold 103 on the surface opposite to the movable template 15. The movable template 15 holds the movable mold 105 on the surface opposite to the fixed template 13. The mold 101 is opened and closed by moving the movable template 15 in the mold opening and closing direction. In addition, when the mold is closed, a mold closing force corresponding to the extension of the connecting rods 17 is applied to the mold 101.

[0038] The injection device 9 is located behind the fixed template 13 (on the opposite side of the movable template 15). The injection device 9 includes: a sleeve 19 communicating with the chamber 107, a plunger 21 that pushes the molten liquid in the sleeve 19 into the chamber 107, and a drive unit 23 that drives the plunger 21. It should be noted that the sleeve 19 and the plunger 21 can be used as consumables, so only the drive unit 23 can be used as the injection device.

[0039] The sleeve 19 is designed to insert through the fixed template 13. It should be noted that the sleeve 19 may not need to insert through the fixed mold 103. Figure 1 (Example), it can also be inserted through. The sleeve 19 is configured as a generally cylindrical component that extends in the horizontal direction (front-to-back direction). The supply port 19a for supplying molten liquid opens on the upper surface of the sleeve 19.

[0040] The plunger 21 has a plunger plate 21a that slides along the sleeve 19 and a plunger rod 21b fixed to the plunger plate 21a. The plunger rod 21b extends in the front-rear direction and its rear end is connected to the drive unit 23 via a connecting member 25.

[0041] exist Figure 1 The image shows the state before injection begins. At this time, the plunger plate 21a is located (at least partially) inside the sleeve 19, positioned rearward of the supply port 19a. In this state, molten metal is injected into the supply port 19a via a liquid supply device (not shown). Next, the plunger plate 21a is slid (advanced) toward the chamber 107 by the driving force of the drive unit 23. As a result, the molten metal is ejected into the chamber 107.

[0042] The control device 5 is configured, for example, to include a computer, although not particularly shown. The computer is configured, for example, to include a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an external storage device, although not particularly shown. The CPU builds various functional sections capable of performing various operations (including control) by executing a program stored in the ROM and / or the external storage device. In addition, the control device 5 can include a logic circuit that performs certain actions, can include a power supply circuit, and can include a driver to define. The control device 5 can be integrated at one location in hardware or can be dispersed at multiple locations.

[0043] (Drive section of injection device)

[0044] Figure 2 is a circuit diagram showing the configuration of the main part of the partial pressurization in the die casting machine DC1. Figure 2 In addition, also shows the configuration of the injection device 9.

[0045] The drive section 23 of the injection device 9 has an injection cylinder 27 coupled to the rear end of the plunger 21 via a coupling member 25, and a hydraulic device 29 communicating with the injection cylinder 27. As already described, at least a part of the configuration of the pressurizing device LM1 can be included as the configuration of the injection device 9, and the hydraulic device 29 includes a part that can be included as a part of the pressurizing device LM1.

[0046] (Injection cylinder)

[0047] The injection cylinder 27 is coaxially arranged with the plunger 21 at the rear of the plunger 21. The injection cylinder 27 has, for example, a cylinder member 31, an injection piston 33 slidable inside the cylinder member 31, and a booster piston 35, and a piston rod 37 extending forward (plunger 21 side) from the injection piston 33.

[0048] The cylinder member 31 is, for example, a substantially cylindrical member. The shape of the cross section of the inside of the cylinder member 31 is, for example, circular. The outer shape (shape of the outside) of the cylinder member 31 can also be a rectangular parallelepiped or the like as appropriate. The cylinder member 31 is not movable with respect to the fixed mold plate 13. The cylinder member 31 has a small-diameter cylinder 31x and a large-diameter cylinder 31y coupled in series at 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.

[0049] The injection piston 33 is configured to be slidable within the small-diameter cylinder 31x. The injection piston 33 is, for example, substantially cylindrical. The diameter of the injection piston 33 is substantially the same as the inner diameter of the small-diameter cylinder 31x. A gasket, not shown, can be interposed between the injection piston 33 and the small-diameter cylinder 31x. In the case where a gasket is interposed, this occurs when the injection piston 33 slides within the small-diameter cylinder 31x (cylinder member 31). The same applies to other members (e.g., the intensifier piston 35). The space inside the small-diameter cylinder 31x is divided by the injection piston 33 into a rod-side chamber 31r on the side of the piston rod 37, and a head-side chamber 31h on the opposite side thereof.

[0050] The intensifier piston 35 has a small-diameter piston 35x that slides within the small-diameter cylinder 31x, and a large-diameter piston 35y that slides within the large-diameter cylinder 31y. The large-diameter piston 35y is connected to the rear end of the small-diameter piston 35x. The small-diameter piston 35x and the large-diameter piston 35y are, for example, substantially cylindrical members. Note that in the illustrated example, a connecting portion having a diameter smaller than that of the small-diameter piston 35x can be formed between the small-diameter piston 35x and the large-diameter piston 35y. The inside of the large-diameter cylinder 31y is divided by the large-diameter piston 35y into a front-side chamber 31a and a rear-side chamber 31b. The intensifier piston 35 has a first face 35c that receives pressure from the working fluid in the head-side chamber 31h, and a second face 35d that receives pressure from the working fluid in the rear-side chamber 31b. The area of the second face 35d is larger than that of the first face 35c. The area ratio can be set as appropriate.

[0051] Note that the area here is the area that receives pressure that contributes to the axial sliding of the intensifier piston 35, in other words, the projected area as viewed in the axial direction. Thus, the area here is constant regardless of the concavities and convexities of the first face 35c and the second face 35d. The same applies to the areas S1 to S4 described later.

[0052] The piston rod 37 is, for example, a substantially cylindrical member. The diameter of the piston rod 37 is smaller than that of the injection piston 33. The difference can be set as appropriate. The piston rod 37 extends to the outside of the cylinder member 31, and the front end thereof is connected to the rear end of the plunger 21 via the connecting member 25.

[0053] The injection piston 33 advances by being supplied with the working fluid to the head-side chamber 31h. As a result, the plunger 21 to which the injection piston 33 is connected via the piston rod 37 and the connecting member 25 advances. Further, the molten metal within the sleeve 19 is injected into the chamber 107. That is, a narrow-sense injection (not including the injection described later that is boosted) is performed.

[0054] Afterward, when supplying the working fluid to the rear side chamber 31b, the working fluid of the head side chamber 31h is pressurized by the booster piston 35. At this time, in the booster piston 35, since the area of the second face 35d is larger than the area of the first face 35c, a pressure higher than the pressure of the rear side chamber 31b can be imparted to the head side chamber 31h. The pressure of 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. Thus, the pressurization of the molding material is performed.

[0055] Note that in the present embodiment, the front side chamber 31a can be filled with the working fluid or can not be filled with the working fluid. For example, the front side chamber 31a can be open to the atmosphere. In the case where the front side chamber 31a is not filled with the working fluid, a small amount of the working fluid (oil) can be provided for lubrication.

[0056] In the case where the front side chamber 31a is filled with the working fluid, the working fluid can or can not be used for some purposes. As an example of the former, for example, a method of imparting a driving force toward the rear to the booster piston 35 by supplying the working fluid to the front side chamber 31a can be cited. In addition, for example, a method of prohibiting the discharge of the working fluid from the front side chamber 31a, and prohibiting the unexpected advancement of the booster piston 35 can be cited. In addition, as an example of the latter, a method of only the front side chamber 31a and the tank can be cited.

[0057] (Configuration of injection cylinder in hydraulic device)

[0058] The configuration of the drive of the injection cylinder 27 in the hydraulic device 29 (except for the part of the new configuration of the drive of the pressurization device LM1) can be a publicly known configuration or a new configuration, in other words, can be various methods. Figure 2 In the present embodiment, the main part of one example of the various methods is shown. Specifically, as follows.

[0059] The hydraulic device 29 has, for example, an injection accumulator 39 as a hydraulic source, a tank 41 that stores the working fluid, a hydraulic circuit 43 that controls the flow of the working fluid. In addition to these, the hydraulic device 29 can have a pump as a hydraulic source, but the illustration thereof is omitted here.

[0060] The injection accumulator 39 contributes to the supply of the working fluid to the injection cylinder 27, for example. The injection accumulator 39 can be configured by an accumulator of an appropriate form such as a weight type, a spring type, an air pressure type (including an air pressure type), a cylinder type, a pladur type, and the like. For example, the injection accumulator 39 is an accumulator of a gas pressure type, a cylinder type, or a pladur type, and pressurizes by compressing a gas (for example, air or nitrogen) held in the injection accumulator 39.

[0061] The tank 41 is, for example, an open tank. That is, the tank 41 holds the working fluid under atmospheric pressure. Thus, for example, when the rod-side chamber 31r is connected to the tank 41, the pressure of the rod-side chamber 31r is reduced to the pressure close to atmospheric pressure.

[0062] The hydraulic circuit 43 has, for example, a flow path 43a connecting the injection accumulator 39 and the head-side chamber 31h. Through the flow path 43a, it is possible to supply the working fluid from the injection accumulator 39 to the head-side chamber 31h, for example.

[0063] In the flow path 43a, an appropriate valve that allows and prohibits the flow of the working fluid can be provided. In the present embodiment, as such a valve, an inspection valve 45A is exemplified. Figure 2 The inspection valve 45A is configured by an inspection valve that is opened and closed by the introduction of a pilot pressure. The inspection valve 45A allows the flow from the injection accumulator 39 to the head-side chamber 31h and prohibits the flow in the opposite direction, for example, when no pilot pressure is applied.

[0064] The hydraulic circuit 43 has, for example, a flow path 43b connecting the injection accumulator 39 and the back-side chamber 31b. Through the flow path 43b, it is possible to supply the working fluid from the injection accumulator 39 to the back-side chamber 31b, for example. In the example illustrated, the flow path 43b shares a part of the injection accumulator 39 side with the flow path 43a.

[0065] In the flow path 43b, an appropriate valve that allows and prohibits the flow of the working fluid can be provided. In the present embodiment, as such a valve, an inspection valve 45B is exemplified. Figure 2 The inspection valve 45B can also be configured by an inspection valve that is opened and closed by the introduction of a pilot pressure. The inspection valve 45B allows the flow from the injection accumulator 39 to the back-side chamber 31b and prohibits the flow in the opposite direction, for example, when no pilot pressure is applied.

[0066] 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, it is possible to discharge the working fluid of the rod-side chamber 31r, which decreases in volume accompanying the advancement of the injection piston 33, to the tank 41, for example.

[0067] In the flow path 43c, an appropriate valve that allows and prohibits the flow of the working fluid can be provided. In the present embodiment, as such a valve, a flow control valve 47 is exemplified. Figure 2 The flow control valve 47 is configured by a flow rate adjusting valve that can maintain the flow rate constant even if the pressure fluctuates, for example. In addition, the flow control valve 47 is used in a servo mechanism, for example, and is configured by a servo valve that can steplessly (continuously, arbitrarily) modulate the flow rate according to an input signal.

[0068] The flow control valve 47 is configured by a flow rate adjusting valve that can maintain the flow rate constant even if the pressure fluctuates, for example. In addition, the flow control valve 47 is used in a servo mechanism, for example, and is configured by a servo valve that can steplessly (continuously, arbitrarily) modulate the flow rate according to an input signal.

[0069] The hydraulic circuit 43 can include various components in addition to the above. For example, although not specifically 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 valves respectively allowing and prohibiting the flow of the working fluid in these flow paths can be provided.

[0070] In addition, the hydraulic circuit 43 described above can be appropriately modified. For example, instead of the metering output circuit, or in addition thereto, a flow control valve in the flow path 43a (may be a shared portion of the flow path 43b, or can be a portion other than such a portion) can be provided. That is, a metering input circuit can be provided. In addition, for example, a flow path in which the working fluid of the rod-side chamber 31r circulates to the head-side chamber 31h, and a valve allowing and prohibiting the flow of the flow path can be provided. That is, a bypass circuit can be provided. The flow control valve of the metering output circuit can be in a flow path constituting the bypass circuit, or in a flow path connecting the bypass circuit and the tank 41 (outside the bypass circuit).

[0071] (Pressurizing device)

[0072] The pressurizing device LM1 has a pressurizing member 49 that pressurizes the molten metal filled in the chamber 107, and a pressurizing cylinder 51 that drives the pressurizing member 49. These configurations can be known configurations, or new configurations, in other words, various modes. For example, as described below.

[0073] Figure 3 (b) is an enlarged view of the pressurizing member 49 and its periphery (described later Figure 3 (b) is an enlarged view of the pressurizing member 49 and its periphery (described later Figure 2 (b) is an enlarged view of the pressurizing member 49 and its periphery (described later Figure 3 (b) is an enlarged view of the pressurizing member 49 and its periphery (described later

[0074] (Pressurizing member)

[0075] The shape of the pressurizing member 49 can be substantially a pin shape with the advancing and retreating direction as the length direction (the example shown in the drawing), or can not be a pin shape. As an example of the latter, a block shape having a diameter larger than the length in the advancing and retreating direction of the pressurizing member 49 can be cited. In addition, the shape of the cross section orthogonal to the advancing and retreating direction of the pressurizing member 49 can be a circular shape (the example shown in the drawing), or a shape other than a circular shape. The dimensions of the pressurizing member 49 are also arbitrary.

[0076] As Figure 3As shown in (b), at least a portion of the front end side (chamber 107 side) of the pressurizing member 49 can also be conical, with a smaller diameter closer to the front end side. In this case, the pressurizing member 49 can be easily pulled out from the solidified molding material. The range of the cone shape can also be appropriately set. In the illustrated example, when the pressurizing member 49 is at the drive limit on the chamber 107 side, the portion of the pressurizing member 49 located within the chamber 107 is entirely conical. It should be noted that, of course, the pressurizing member 49 may not be a shape that tapers at the tip (e.g., a shape with a fixed diameter).

[0077] The pressurizing component 49 can also be configured in the fixed mold 103 (as illustrated) or in the movable mold 105. However, in this embodiment, the pressurizing device LM1 is connected to the injection device 9. Generally, the injection device 9 is fixed to the fixed mold 103. Therefore, when the pressurizing component 49 is configured in the fixed mold 103, the configuration of the hydraulic device 29 shared in the pressurizing device LM1 and the injection device 9 can be miniaturized and / or simplified, for example.

[0078] It should be noted that, for convenience, this embodiment is described with the pressure member 49 disposed on the fixed mold 103.

[0079] The pressurizing component 49 may, for example, slide (abut) partially or entirely relative to the mold (fixed mold 103 or movable mold 105) in the forward and backward direction. The rear end portion of the pressurizing component 49 (the portion connected to the pressurizing cylinder 51) may be located outside the mold, or the entire component may be located inside the mold. As an example of the latter, it is possible to illustrate how the rear end portion of the pressurizing component 49 is located in a space formed by a mold structure not shown.

[0080] The advancing and retreating direction of the pressure component 49 can also be an appropriate direction. For example, the advancing and retreating direction can be the mold opening and closing direction ( Figure 2 The direction can be either left or right (as shown in the example), or it can be a direction that intersects (or is orthogonal or inclined) the mold opening and closing direction. However, when the advancing and retreating direction is the mold opening and closing direction, for example, the pressure member 49 can be pulled out from the molded article along with the action of peeling the molded article out of the mold on which the pressure member 49 is arranged (which can be a mold opening action and / or a pressing action).

[0081] The arrangement position of the pressurizing member 49 with respect to the cavity 107 can also be appropriately set. For example, the cavity 107 includes a product portion 107a having a shape corresponding to the shape of the product, and an overflow portion 107b for allowing the remaining molten metal to flow in. In the illustrated example, the pressurizing member 49 is arranged to pressurize the molten metal flowing into the overflow portion 107b. However, the pressurizing member 49 can also be arranged to pressurize the molten metal located in the product portion 107a. In this case, the pressurizing member 49 can also be arranged, for example, at a position where cavitation is likely to occur.

[0082] The overflow portion 107b is generally located at the outer periphery of the product portion 107a (particularly, at a position away from the sleeve 19) as viewed from the mold opening / closing direction. Thus, the pressurizing member 49 that pressurizes the molten metal in the overflow portion 107b can impart pressure to the molten metal on the outer periphery side, which is difficult to be pressurized, using the plunger 21 in the molten metal in the product portion 107a. As a result, for example, the molten metal in the product portion 107a is likely to be pressurized equally throughout the entire body. Further, in the case of forming a large product, the necessity of increasing the pressure imparted to the molten metal using the plunger 21 can be reduced. In another aspect, the necessity of upsizing the die casting machine 1 can be reduced.

[0083] Note that the stationary mold 103 (the mold in which the pressurizing member 49 is arranged) can also have a recessed portion 107c on the side of the movable mold 105, into which the front end portion of the pressurizing member 49 can enter and exit. The diameter of the recessed portion 107c can be larger than the front end portion of the pressurizing member 49, for example, and can also be inversely tapered such that the diameter becomes larger as it approaches the movable mold 105. With the recessed portion 107c, the volume for allowing the pressurizing member 49 to enter and exit the cavity 107 is ensured in the cavity 107. Further, with the inverse taper, the solidified molding material is likely to be pulled out from the stationary mold 103. Of course, the stationary mold 103 can also not have such a recessed portion 107c, and can have a recessed portion 107c that is not inversely tapered.

[0084] The number of pressurizing members 49 can be appropriately set, and can be one or two or more. Figure 2 In the drawing, one pressurizing member 49 is shown in order to avoid complication of the drawing.

[0085] (Pressurizing Cylinder)

[0086] The pressurizing cylinder 51 has, for example, a cylinder member 53, a pressurizing piston 55 that can slide inside the cylinder member 53, and a piston rod 57 that extends from the pressurizing piston 55 to the outside of the cylinder member 53.

[0087] The cylinder member 53 is, for example, a substantially cylindrical member. The cross-sectional shape of the inside of the cylinder member 53 is, for example, circular. The shape of the outside (the shape of the outside) of the cylinder member 53 can also be a rectangular parallelepiped or the like as appropriate. The pressurizing piston 55 is, for example, a substantially cylindrical member, and is able to slide the inside of the cylinder member 53 in the axial direction. The space inside the cylinder member 53 is divided into a rod-side chamber 53r on the side of the piston rod 57, and a head-side chamber 53h on the opposite side of the rod-side chamber 53r, by the pressurizing piston 55. The piston rod 57 is, for example, a substantially cylindrical member. The diameter of the piston rod 57 is smaller than the diameter of the pressurizing piston 55. The difference can be set as appropriate.

[0088] The pressurizing cylinder 51 is, for example, coaxially arranged on the side opposite the chamber 107 of the pressurizing member 49, and further has the piston rod 57 side facing the pressurizing member 49. The cylinder member 53 is fixed with respect to the fixed mold 103 (the mold in which the pressurizing member 49 is arranged). For example, the cylinder member 53 is fixed with respect to the fixed mold 103 and / or the fixed mold plate 13 by a bolt or the like. The front end of the piston rod 57 is linked to the rear end of the pressurizing member 49 by an appropriate link member (omitted from the drawing).

[0089] Thus, for example, in the pressurizing cylinder 51, when the working fluid is supplied to the head-side chamber 53h, the pressurizing piston 55 moves to the rod-side chamber 53r side. Further, the pressurizing member 49 linked to the pressurizing piston 55 via the piston rod 57 advances toward the chamber 107.

[0090] In contrast to the above description, the cylinder member 53 can also be fixed to the pressurizing member 49, and the piston rod 57 can be fixed with respect to the fixed mold 103. Further, the orientation of the pressurizing cylinder 51 can also be reversed from the above description. That is, the combination of which of the cylinder member 53 and the piston rod 57 is fixed, and the orientation of the pressurizing cylinder 51, is possible in three ways other than the illustrated example.

[0091] In relation to the above, when the pressurizing member 49 is caused to advance toward the side of the chamber 107, the cylinder chamber (the first chamber) to which the working fluid is supplied can also be the rod-side chamber 53r. For example, consider a manner in which the piston rod 57 is fixed, and the cylinder member 53 is linked to the pressurizing member 49, in the orientation of the pressurizing cylinder 51 illustrated. In this manner, the pressurizing member 49 is caused to advance toward the side of the chamber 107 by supplying the working fluid to the rod-side chamber 53r.

[0092] Note that, in the description of the present embodiment, the description is premised on the illustrated manner (the manner in which the piston rod 57 is oriented toward the pressurizing member 49, and the cylinder member 53 is fixed) for convenience.

[0093] The number of pressurizing members 49 driven by one pressurizing cylinder 51 can be one (the illustrated example) or two or more. In the latter case, for example, by analogy with a known press-out device, a plate-shaped member orthogonal to the piston rod 57 can be fixed to the front end of the piston rod 57, and a plurality of pressurizing members 49 can be fixed in parallel to this plate-shaped member. Note that in the description of the present embodiment, the description is premised on the illustrated example (one pressurizing member 49 driven by one pressurizing cylinder 51) for convenience.

[0094] As will be understood from the description below, in the present embodiment, the movement of the pressurizing piston 55 resulting from the supply of hydraulic fluid to the rod-side chamber 53r (the retreat of the pressurizing member 49 from the chamber 107) is not necessarily performed. Thus, the rod-side chamber 53r can or can not be filled with hydraulic fluid. In the latter case, for example, the rod-side chamber 53r can be open to the atmosphere. In this case, oil as hydraulic fluid can be disposed in the rod-side chamber 53r in a small amount for the purpose of lubrication or the like. Also, in the case where the rod-side chamber 53r is filled with hydraulic fluid, the rod-side chamber 53r can be supplied with only a deficient amount of hydraulic fluid from the tank 41 or the drive source (e.g., a pump) when its volume expands.

[0095] Also, the pressurizing cylinder 51 can be configured so that the pressurizing piston 55 extends from the cylinder member 53 to the side opposite the head-side chamber 31h (in another viewpoint, the diameter of the piston rod 57 is the same as the diameter of the pressurizing piston 55), and does not have the rod-side chamber 53r. However, in the description of the present embodiment, the description is premised on the illustrated example (the pressurizing cylinder 51 has the rod-side chamber 53r) for convenience.

[0096] (Configuration of the pressurizing cylinder in the hydraulic device)

[0097] As shown in FIG. 6, the hydraulic device 29 is connected to the head-side chamber 53h of the pressurizing cylinder 51, and can perform the inflow and outflow of hydraulic fluid with respect to the head-side chamber 53h. Specifically, as follows. Figure 2

[0098] The hydraulic circuit 43 of the hydraulic device 29 has a communication path 43d that communicates the head-side chamber 31h of the ejection cylinder 27 and the head-side chamber 53h of the pressurizing cylinder 51. In the illustrated example, the communication path 43d shares a portion on the head-side chamber 31h side with a portion on the head-side chamber 31h side of the flow path 43a that communicates the ejection accumulator 39 and the head-side chamber 31h. However, the communication path 43d and the flow path 43a can be separate flow paths from each other as a whole. Also, a portion of the communication path 43d that is not shared with the flow path 43a can be a communication path.

[0099] ​By providing the communication passage 43d, for example, the pressure imparted 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. Thereby, for example, at the time of starting injection by supplying the working fluid to the head-side chamber 31h from the injection accumulator 39, the working fluid is also supplied to the head-side chamber 53h, and the pressurizing member 49 can be moved to the advanced limit and / or the pressurizing member 49 can be held at the advanced limit. Note that the significance of this operation will be described later. Also, for example, at the time of pressurization of the working fluid of the head-side chamber 31h by the pressurizing piston 35, the pressure of the pressurization can be transmitted to the head-side chamber 53h, the pressurizing member 49 can be advanced, and partial pressurization can be performed.

[0100] An appropriate component can also be provided or connected in the communication passage 43d. In the illustrated example, from the head-side chamber 31h side, a throttle valve 59A, a switching valve 61, a check valve 45C, a throttle valve 59B, and a surge accumulator 63 are provided or connected in this order. Note that one or more or all of these components can not be provided.

[0101] The throttle valve 59A is a so-called non-compensating flow control valve that maintains a certain relationship between the flow rate and the pressure difference by having a certain opening degree. The throttle valve 59A can have various configurations including a needle valve, a disc valve, and a ball valve, which are known configurations. The opening degree of the throttle valve 59A can be fixed or variable, but is at least constant for one or more cycles, 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 restricts the flow rate (pressure difference) in the communication passage 43d. This restriction contributes to adjustment of, for example, the timing of imparting pressure to the head-side chamber 31h of the injection cylinder 27 and the timing of imparting pressure to the head-side chamber 53h of the pressurizing cylinder 51. Note that instead of the throttle valve 59A, the communication passage 43d can be configured so as to have a locally smaller cross-sectional area.

[0102] The switching valve 61 is located in the communication passage 43d, and allows and prohibits the flow of the working fluid in the communication passage 43d. In the illustrated example, the switching valve 61 is a two-port two-position switching valve that is driven to the closed position by a spring and is driven to the open position by a solenoid. The switching valve 61, for example, is closed at an appropriate timing, and restricts unintended operation of the pressurizing cylinder 51. Note that instead of the switching valve 61, a pilot-type check valve like the check valve 45A can be provided as a valve that allows and prohibits the flow of the working fluid in the communication passage 43d.

[0103] The check valve 45C is located in the communication passage 43d, allows the flow of the working fluid from one side of the head side chamber 31h of the injection cylinder 27 to one side of the head side chamber 53h of the pressurizing cylinder 51, and prohibits the flow in the opposite direction. Thus, for example, the pressure imparted to the head side chamber 31h is allowed to be imparted to the head side chamber 53h, and the possibility that a higher pressure generated in the head side chamber 53h by the impact pressure described later is transmitted to one side of the head side chamber 31h is reduced. In the illustrated example, the check valve 45C is not a pilot type structure, but can be a pilot type structure.

[0104] The throttle valve 59B is configured the same as the throttle valve 59A, and the description of the configuration of the throttle valve 59A described above can be appropriately applied to the throttle valve 59B. Of course, the specific configurations such as the size and shape can be different. The opening degree of the throttle valve 59B can be fixed or variable, but is at least constant in one or more molding cycles, 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 the flow path of the bypass check valve 45C (omitted from the reference characters). The throttle valve 59B helps, for example, the possibility that a higher pressure generated in the head side chamber 53h of the pressurizing cylinder 51 by the impact pressure is transmitted to one side of the injection cylinder 27 by limiting the flow rate. On the other hand, the throttle valve 59B does not completely prohibit the flow, and thus, for example, allows the working fluid flowing into the surge accumulator 63 to be discharged to one side of the injection cylinder 27. Note that, instead of the throttle valve 59B, the bypass flow path can be configured so that the cross-sectional area of the bypass flow path is smaller than the cross-sectional area of the communication passage 43d in part or all of the cross-sectional area.

[0105] The surge accumulator 63 is connected to the communication passage 43d, and helps, for example, the absorption of the temporary and sharp rise in the pressure of the molten metal (impact pressure). As described later, the surge accumulator 63 absorbs the pressure generated in the pressurizing cylinder 51 (in another viewpoint, the pressure imparted from the molten metal to the pressurizing member 49), not the pressure generated in the injection cylinder 27 (in another viewpoint, the pressure imparted from the molten metal to the plunger 21), unlike the surge accumulator as known. The description of the configuration of the injection accumulator 39 described above can be appropriately applied to the surge accumulator 63. However, the surge accumulator 63 can be configured so that the pressure that can be stored is smaller or the amount of the working fluid that can be discharged is smaller than the injection accumulator 39.

[0106] Note that, in the description of the present embodiment, the surge accumulator 63 is described on the premise of being of a cylinder type. The surge accumulator 63 of the cylinder type has a cylinder member 63a and a piston 63b that is able to slide within the cylinder member 63a. The inside of the cylinder member 63a is divided by the piston 63b into a liquid chamber 63c and a gas chamber 63d. The liquid chamber 63c communicates with the communication passage 43d. The gas chamber 63d is filled with an appropriate kind of gas (for example, nitrogen).

[0107] (Examples of Parameters)

[0108] The dimensions of the constituent elements described thus far, and the pressure and the like parameters, and the size relationships of the constituent elements with respect to each other of these parameters, and the like can be set as appropriate. Hereinafter, examples of parameters that are able to function in particular ways are shown.

[0109] (Ratio of Areas of Cylinder and the Like)

[0110] The cross-sectional areas (in other words, the areas that bear the pressure of the working fluid or the molding material) of the injection cylinder 27, the plunger 21, the pressurizing cylinder 51, and the pressurizing member 49 can be set as appropriate. For example, these can be set as follows.

[0111] Suppose a case in which the number of pressurizing members 49 that are driven by one pressurizing cylinder 51 is one. The area that the pressurizing piston 55 bears the pressure of the working fluid from the head side chamber 53h (in other words, the cylinder chamber that supplies the working fluid when partial pressurization is performed) of the pressurizing cylinder 51 is set to S3. The area that the pressurizing member 49 imparts pressure to the molding material of the cavity 107 is set to S4. The area that the injection piston 33 bears the pressure of the working fluid from the head side chamber 31h of the injection cylinder 27 is set to S1. The area that the plunger 21 imparts pressure to the molding material of the cavity 107 is set to S2.

[0112] At this time, for example, S4 / S3 with respect to S2 / S1 can be 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, 1.0 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. Of course, the ratio of S4 / S3 with respect to S2 / S1 can also be outside the above ranges.

[0113] Note that, the decimal places that are not recorded can be rounded. For example, the range of 0.5 times or more can also include 0.45 times. The range of 1.5 times or less can also include 1.54 times. The same applies to other numerical ranges.

[0114] When the areas S1 to S4 are set as described above, the pressure imparted to the molding material by the plunger 21 and the pressure imparted to the molding material by the pressure-imparting member 49 can be the same, for example. Specifically, as described below. When imparting pressure to the head-side chamber 31h of the injection cylinder 27, the pressure imparted to the molding material by the plunger 21 is S2 / S1 times the pressure of the head-side chamber 31h. Likewise, when imparting pressure to the head-side chamber 53h of the pressure cylinder 51, the pressure imparted to the molding material by the pressure-imparting member 49 is S4 / S3 times the pressure of the head-side chamber 53h. On the other hand, the head-side chamber 31h and the head-side chamber 53h are connected by the communication passage 43d, and the pressures of the two cylinder chambers can be the same. Thus, in theory, the ratio of the pressure imparted to the molding material by the pressure-imparting member 49 to the pressure imparted to the molding material by the plunger 21 is the same as the ratio of S4 / S3 to S2 / S1. Also, when the ratio of S4 / S3 to S2 / S1 is within the range described above, the pressure imparted to the molding material by the plunger 21 and the pressure imparted to the molding material by the pressure-imparting member 49 are approximately the same.

[0115] In a manner in which the number of pressure-imparting members 49 driven by one pressure cylinder 51 is plural, the sum of the areas of the molding material to which pressure is imparted by all of the pressure-imparting members 49 driven by one pressure cylinder 51 to the chamber 107 can be set as the area S4, and it can be determined whether the ratio of S4 / S3 to S2 / S1 is within the range described above. In the case where there are two or more pressure cylinders 51, the condition that the ratio of S4 / S3 to S2 / S1 is within the range described above can be satisfied with respect to a part (at least one) of the pressure cylinders 51, or can be satisfied with respect to all of the pressure cylinders 51.

[0116] (Volume ratio of accumulator, etc.)

[0117] The volume of the surge accumulator 63 and the volume of the pressure cylinder 51 can also be set as appropriate. These can also be set as follows, for example.

[0118] In the pressurizing cylinder 51, the maximum amount of change in the volume of the head-side chamber 53h is defined in accordance with the movable range of the pressurizing piston 55 with respect to the cylinder member 53. The movable range of the pressurizing piston 55 is defined, for example, by a stopper (may also be the end inner surface of the cylinder member 53) that the cylinder member 53 has. For example, one stopper abuts (in another view, engages) the pressurizing piston 55 from the front to the back when the pressurizing piston 55 is at the forward limit (driving limit) and restricts further advancement of the pressurizing piston 55. Likewise, the other stopper abuts the pressurizing piston 55 from the back to the front when the pressurizing piston 55 is at the backward limit (driving limit) and restricts further retreat of the pressurizing piston 55. In addition to the above, a stationary member (for example, the fixed mold 103 or the fixed mold plate 13) defines the movable range of the pressurizing piston 55 by abutting a stopper that the cylinder member 53 has on the outside against the piston rod 57, the pressurizing member 49, or a link member (reference numeral is omitted) that links these structures. That is, the movable range is defined mechanically regardless of the pressure of the working fluid.

[0119] Suppose that the surge accumulator 63 has a configuration of a piston 63b. As a configuration having a piston 63b, as in the illustrated example, a configuration in which the inside of a cylinder member 63a is divided into a liquid chamber 63c and a gas chamber 63d by the piston 63b can be cited. In addition to the illustrated example, a configuration in which the piston 63b (piston) extends from the cylinder member 63a to the side opposite the liquid chamber 63c and exerts force on the liquid chamber 63c side of the piston 63b by gravity and / or a spring can be cited.

[0120] In the surge accumulator 63 having the piston 63b, as in the pressurizing cylinder 51, the maximum amount of change in the volume of the liquid chamber 63c can also be defined by the movable range of the piston 63b with respect to the cylinder member 63a. The movable range of the piston 63b is sometimes the same as the movable range of the pressurizing piston 55 and is defined mechanically (for example, by engagement). For example, the cylinder member 63a can define the driving limit to the liquid chamber 63c side and the driving limit to the side opposite the liquid chamber 63c by a stopper (may also be the end inner surface of the cylinder member 63a) that it has on the inside or a stopper that is located on the outside of the cylinder member 63a.

[0121] The maximum change amount (dV1) of the volume of the head side chamber 53h of the pressurizing cylinder 51 and the maximum change amount (dV2) of the volume of the liquid chamber 63c can also be appropriately set, and the relative relationship between the two can also be appropriately set. For example, the maximum change amount dV2 can be 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, 1.0 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, with respect to the maximum change amount dV1. That is, the maximum change amount dV1 and the maximum change amount dV2 can be the same as each other or close to each other in size. Of course, dV2 / dV1 can also be outside the above range.

[0122] By making dV2 / dV1 be in the above range, for example, the surge accumulator 63 can sufficiently absorb the impact pressure. In addition, for example, the possibility that the surge accumulator 63 absorbs the pressure that should be transmitted from the head side chamber 31h of the injection cylinder 27 to the head side chamber 53h of the pressurizing cylinder 51 can be reduced. These effects will be described in detail later.

[0123] As described above, as the maximum change amount of the volume of the surge accumulator 63, a structure in which the movable range of the piston 63b defines the structure (mechanically defines the structure) is exemplified. However, the ratio of the maximum change amount of the volume that is defined by the minimum pressure and the maximum pressure that can be generated in the liquid chamber 63c of the surge accumulator 63 during the molding cycle to the maximum change amount of the volume of the head side chamber 53h of the pressurizing cylinder 51 can also satisfy the above range. In this case, the surge accumulator 63 is not limited to a structure having a piston 63b.

[0124] (Pressure of Accumulator)

[0125] The pressures of the injection accumulator 39 and the surge accumulator 63 (in the description of the present embodiment, the pressures imparted to the working fluid. ) can also be appropriately set. For example, these can also be set as follows.

[0126] As is the same as described above, a surge accumulator 63 having a piston 63b is assumed. The pressure of the surge accumulator 63 at the time of driving limit of movement of the piston 63b to one side of the liquid chamber 63c is set to P2. Further, the pressure at the time of start of release of the injection accumulator 39 is set to PI. Note that the time of start of release is, as will be understood from the description later, the time of start of injection in the present embodiment. The pressure P2 can 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 PI. Of course, P2 / PI can also be outside the above range. In the case where P2 / PI is in the above range, for example, as will be understood from the description later, the possibility of generation of unexpected flow of hydraulic fluid can be reduced by the surge accumulator 63.

[0127] (Other configurations of the die casting machine)

[0128] The die casting machine DC1 can also have various sensors. Further, the control device 5 can control each part such as the hydraulic device 29 based on the detection values of the various sensors.

[0129] Examples of the above-described sensors are listed. For example, although not particularly illustrated, 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 a pressure sensor that detects the pressure of the injection accumulator 39 can be provided. Since the velocity can be obtained by differentiation of the position, the position sensor can also function as a velocity sensor. The various sensors can also include various structures of well-known configurations.

[0130] The sensor that detects the position of the plunger 21 is used, for example, for control of the injection velocity (in other words, the velocity of the plunger 21). The pressure sensor that detects the pressure of the head-side chamber 31h (and the pressure sensor that detects the pressure of the rod-side chamber 31r as necessary) is used for control of the injection pressure (in other words, the pressure imparted to the molding material by the plunger 21). The pressure sensor that detects the pressure of the injection accumulator 39 is used, for example, for control of the pressure buildup of the injection accumulator 39.

[0131] (Outline of the operation of injection and partial pressurization)

[0132] Figure 3 (a) ~ Figure 5 (b) is a schematic view that shows an outline of the operation of the injection device 9 and the pressurization device LM1.

[0133] Figure 3 (a), Figure 4 (a) and Figure 5 (a) is a view that shows the state at different times from each other in the molding cycle. Figure 2 (b) is a schematic view that shows an outline of the operation of the injection device 9 and the pressurization device LM1.Figure 3 (b) is Figure 3 (a) Enlarged view of region III. Figure 4 (b) is Figure 4 (a) Enlarged view of region III. Figure 5 (b) is Figure 5 (a) Enlarged view of region III.

[0134] exist Figure 3 (a) Figure 4 (a) and Figure 5 In (a), due to paper limitations, only [the following text is shown] is displayed. Figure 2 Part of the reference numerals in the accompanying drawings. For the reference numerals in the following description, please refer appropriately. Figure 2 In these diagrams, the bolded flow paths represent the structure of the working fluid flow (or, from another perspective, the pressure imparted).

[0135] Figure 3 (a) indicates the state of injection (injection process) in a narrow sense, such as low-speed injection and high-speed injection. In the injection process, the working fluid flows from the injection accumulator 39 to the head chamber 31h. As a result, the injection piston 33 advances, and the plunger 21 forces the molten liquid 109 in the sleeve 19 into the chamber 107.

[0136] During the injection process, the pressure from the injection accumulator 39 is also supplied to the head chamber 53h of the pressurizing cylinder 51 via the connecting passage 43d. Thus, as... Figure 3 As shown in (b), the pressure component 49 is located at the drive limit on the side of chamber 107 (see also...). Figure 3 (a) The position of the pressurizing piston 55. It should be noted that the drive limit of the pressurizing component 49, as understood from the description of the drive limit in the pressurizing cylinder 51, can also be determined by the engagement in the pressurizing cylinder 51, or by the engagement in other components (the same applies to the drive limit on the side opposite to the chamber 107 described later).

[0137] The pressure of the ejection accumulator 39 is also supplied to the surge accumulator 63 via the connecting passage 43d. However, as already described, the pressure in the surge accumulator 63 when the piston 63b is at its drive limit on one side of the liquid chamber 63c is the same as the pressure at the start of ejection of the ejection accumulator 39. Therefore, the pressure in the surge accumulator 63 is approximately balanced with the pressure in the ejection accumulator 39. Consequently, the piston 63b remains at its drive limit on one side of the liquid chamber 63c.

[0138] Figure 4 (a) indicates that in Figure 4(a) After that, the molten metal fills the entire chamber 107. At this time, the pressure of the molten metal is increased by pressing the molten metal that has lost the release space by the plunger 21. Sometimes, the impact pressure is generated by the inertial force of the plunger 21 that is applied to the molten metal.

[0139] As shown in Figure 4 (b), the pressure applying member 49 is moved from the chamber 107 to the direction of retreat from the pressure of the molten metal. Thus, as shown in Figure 4 (a), in the pressure cylinder 51, the pressure piston 55 is moved to one side of the head side chamber 53h, and the working fluid of the head side chamber 53h is discharged to the communication path 43d. The working fluid flows to the surge accumulator 63. Thus, the impact pressure is absorbed. Note that the pressure applying member 49 can reach the driving limit on the side opposite to the chamber 107 (the illustrated example) or can not reach it.

[0140] Figure 5 (a) shows the state in which Figure 5 (a) After that, the pressure is increased (pressure increasing process). In the pressure increasing process, the working fluid is supplied from the ejection accumulator 39 to the rear side chamber 31d of the ejection cylinder 27. As a result, the pressure higher than the pressure of the ejection accumulator 39 is imparted to the head side chamber 31h of the ejection cylinder 27 by the pressure increasing action of the pressure piston 35. Further, the plunger 21 increases the pressure imparted to the molten metal in the chamber 107.

[0141] The pressure of the head side chamber 31h higher than the pressure of the ejection accumulator 39 is imparted to the head side chamber 53h of the pressure cylinder 51 via the communication path 43d. Thus, as shown in Figure 3 (b), the pressure applying member 49 is moved to one side of the chamber 107, and the molten metal is imparted with the pressure. That is, the partial pressure is performed.

[0142] (Details of the operation of the ejection and the partial pressure)

[0143] Figure 4 is a time chart for explaining the details of the operation of the ejection and the partial pressure described above.

[0144] In Figure 5 , the horizontal axis represents time t. In addition, the solid line Lv represents the change in the ejection speed (the speed of the plunger 21), and the broken line Lp represents the change in the ejection pressure (for example, the pressure imparted to the molten metal by the plunger 21). In the graph in which the solid line Lv and the broken line Lp are drawn, the vertical axis represents the magnitude of the ejection speed V and the ejection pressure P.

[0145] In Figure 5 , the check valve 45A (the "ejection valve") and the check valve 45B (the "pressure valve") are shown below the graph. Figure 3 In Figure 7In this context, the operation of the "boost valve" is described. "Open" indicates that these valves open due to the introduction of pilot pressure. "Closed" indicates that these valves close due to the introduction of pilot pressure. However, the "closed" state of the check valve 45A could also be due to automatic closure caused by the pressure in the head chamber 53h being higher than the pressure in the injection accumulator 39.

[0146] In the overview stage, the injection device 9 sequentially performs low-speed injection (times t0 to t1), high-speed injection (times t1 to t3), pressurization (times t4 to t5), and pressure holding (times t5 to t6). That is, based on the viewpoint of preventing air entrapment of the molten metal in the initial stage of injection, the injection device 9 performs injection at a relatively low speed (velocity V). L The plunger 21 is advanced at a low speed. Next, the injection device 9, based on the viewpoint of not delaying the solidification of the molten metal, proceeds at a relatively high speed (velocity V). H The plunger 21 is advanced by high-speed injection. Next, based on the viewpoint of preventing cracks in the molded part, the injection device 9 can utilize the force in the forward direction of the plunger 21 to raise the molten liquid in the chamber 107 to the casting pressure P. E The pressure increases. Then, the injection unit 9 maintains the casting pressure P. E The pressure holding process is as follows.

[0147] (Low-speed injection: t0~t1)

[0148] Before the start of low-speed injection, injection cylinder 27 becomes Figure 2 The state shown indicates that the injection piston 33 and the pressurizing piston 35 are in their initial positions, such as the retraction limit. Additionally, the injection accumulator 39 completes the filling (pressurization) of the working fluid. Check valves 45A and 45B, and the flow control valve 47 are, for example, closed. The switching valve 61 can be closed or open. Hereinafter, the switching valve 61 will be assumed to be always open, and the operation of the switching valve 61 will be omitted. The pressurizing piston 55 can be in any position as its initial position, but for example... Figure 1 That is at the forward limit. The piston 63b of the surge accumulator 63 is, for example, at the drive limit on one side of the liquid chamber 63c.

[0149] The control device 5 determines whether the prescribed injection start conditions are met. The injection start conditions may be, for example, obtaining information indicating that the mold closing of the fixed mold 103 and the moving mold 105 has ended and that molten metal has been supplied to the sleeve 19. Furthermore, when the control device 5 determines that the injection start conditions are met, it begins injection (low-speed injection).

[0150] Specifically, the control device 5 opens the check valve 45A. Thereby, the working fluid is supplied from the injection accumulator 39 to the head-side chamber 31h. In addition, the control device 5 opens the flow control valve 47. Thereby, the discharge of the working fluid from the rod-side chamber 31r is permitted. Further, the injection piston 33 advances while discharging the working fluid of the rod-side chamber 31r by the pressure received from the head-side chamber 31h. Thereby, the operation explained with reference to Figure 8 (a) and Figure 2 (b) is realized.

[0151] The speed of the plunger 21 is controlled by adjusting the flow rate of the working fluid discharged from the rod-side chamber 31r using the flow control valve 47. Specifically, the control device 5 performs feedback control of the opening degree of the flow control valve 47 in a manner that the speed of the plunger 21 detected by a position sensor not shown converges to a target speed. This feedback control can be, for example, feedback control of the speed itself, or feedback control of the actual speed realized by feedback control of the position in a manner that the detected position of the plunger 21 becomes the target position at every moment. The speed of the plunger 21 is, for example, low (e.g., less than 1 m / s) and constant. However, multi-stage control of the speed of the plunger 21 can also be performed.

[0152] (high-speed injection: t1 to t3)

[0153] The opening degree of the flow control valve 47 is increased, the flow rate of the working fluid discharged from the rod-side chamber 31r is increased, and the speed of the plunger 21 is increased when a prescribed high-speed start condition is satisfied by the control device 5. The control at this time can be the same as that at the time of low-speed injection except that, for example, the target speed is different. The high-speed start condition can be, for example, that the position of the plunger 21 reaches a prescribed high-speed switching position. The control device 5 can switch the target speed by determining whether the detected position of the plunger 21 reaches the high-speed switching position, or can simply realize a target position at every moment based on the high-speed switching position and the target speed based on the setting.

[0154] (deceleration injection: t3 to t4)

[0155] When the molten metal fills the chamber 107 to some extent, the plunger 21 is decelerated by receiving a reaction force from the molten metal that fills it, and on the other hand, the injection pressure sharply rises. Note that the operation of each part is the same as at the time of high-speed injection. However, it can also be deceleration control in which the opening degree of the flow control valve 47 is reduced. By this deceleration control, for example, the impact pressure is reduced.

[0156] (absorption of impact pressure: around t4)

[0157] In addition, when the molten metal fills the chamber 107 to some extent, the operation explained with reference to Figure 2 (a), Figure 8(b) As described above, a temporary and rapidly increasing pressure of the molten metal (e.g., impact pressure) is applied to the connecting passage 43d via the pressurizing member 49 and the pressurizing cylinder 51. This pressure is absorbed by the surge accumulator 63, as already described.

[0158] At this time, the maximum change in volume (dV2) of the liquid chamber 63c of the surge accumulator 63, but the maximum change in volume (dV1) of the head chamber 53h of the pressurized cylinder 51, compared to the above-mentioned methods, means that the surge accumulator 63 can absorb all the working fluid discharged from the head chamber 53h. Furthermore, for example, in methods where dV2 and dV1 are approximately equal, such as... Figure 8 As shown in (a), piston 63b can be positioned at the drive limit on the side opposite to liquid chamber 63c. In connecting path 43d, the transmission of pressure on the side closer to ejection cylinder 27 than surge accumulator 63 is reduced by check valve 45C (and throttle valve 59B).

[0159] The working fluid absorbed by the surge accumulator 63 can be released to one side of the injection cylinder 27 via the throttle valve 59B. However, since the pressure in the head chamber 31h of the injection cylinder 27 increases through pressurization as described below, its amount can be limited. Therefore, for example... Figure 9 As shown in (a), the piston 63b, located on the side opposite to the liquid chamber 63c, easily maintains its position at the drive limit.

[0160] (Boost: t4~t5)

[0161] When the specified pressurization start conditions are met, the control device 5 opens the check valve 45B. The pressurization start conditions are, for example, when the injection pressure reaches a specified pressure based on the pressure detected by a pressure sensor (not shown) that detects the pressure in the head chamber 31h (and, if necessary, a pressure sensor that detects the pressure in the rod chamber 31r), or when the detected position of the plunger 21, detected by a position sensor (not shown), reaches a specified position.

[0162] By opening the inspection valve 45B, working fluid is supplied from the injection accumulator 39 to the rear chamber 31d. Then, the pressure in the head chamber 31h, due to the pressure increase of the booster piston 35, rises above the pressure in the injection accumulator 39, and the inspection valve 45A automatically closes. Thus, as per reference... Figure 2 (a) and Figure 9 (b) As described, pressurization is performed, and localized pressurization is also performed. It should be noted that the check valve 45A may not close automatically, but may close by introducing pilot pressure.

[0163] The control device 5 performs pressure control based on the detection value of a pressure sensor (not shown) that detects the pressure of the head-side chamber 31h (the detection value of the injection pressure) during the pressurization process. Note that the start of the pressure control and the start of the supply of the working fluid to the rear-side chamber 31d can also be deviated from the timing. During the pressure control, the control device 5 performs feedback control on the flow control valve 47 such that the detection value of the injection pressure increases along a prescribed pressure increase curve, for example. Thereafter, the injection pressure reaches the casting pressure P E (the final pressure).

[0164] The pressure of the head-side chamber 31h of the injection cylinder 27 pressurized by the pressurization piston 35 is transmitted to the head-side chamber 53h of the pressurization cylinder 51 via the communication passage 43d. At this time, the pressure of the throttle valve 59A is transmitted with a delay. Thus, the pressurization of the molten metal by the plunger 21 can be started promptly, for example.

[0165] In addition, as has been described, in the surge absorber 63 that absorbs the surge of the pressure, the piston 63b can be positioned at or near the drive limit on the side opposite the liquid chamber 63c. Thus, the pressure of the head-side chamber 31h of the injection cylinder 27 pressurized by the pressurization piston 35 is less likely to be absorbed by the surge absorber 63. Thus, the local pressurization can be started promptly, for example.

[0166] (holding pressure: t5 to t6)

[0167] When the control device 5 determines that the injection pressure has reached the final pressure based on the detection value of the pressure sensor, the control device 5 controls the hydraulic device 29 so as to maintain the final pressure. That is, the holding pressure is performed. Specifically, the holding pressure is performed by continuing the application of the pressure from the injection accumulator 39 to the rear-side chamber 31b, for example.

[0168] During the holding pressure, the molten metal in the cavity 107 is cooled and solidified. When the control device 5 determines that the molten metal has solidified (time t6), the control device 5 controls the hydraulic device 29 so as to end the holding pressure. The control device 5 closes the check valve 45A to prohibit the flow of the working fluid from the injection accumulator 39 to the rear-side chamber 31b, or closes the flow control valve 47 to prohibit the outflow of the working fluid from the rod-side chamber 31r, for example. The control device 5 can also determine whether the molten metal has solidified appropriately. The control device 5 determines whether the molten metal has solidified based on whether a prescribed time has elapsed from a prescribed time such as the time t5 at which the final pressure is obtained, for example.

[0169] (protrusion operation: t8 to t9)

[0170] After the pressure holding is ended, the control device 5 controls the clamping device 7 to move the movable mold 105 in a direction away from the fixed mold 103 to perform mold opening. The molded product formed by solidification of the molten metal is left in the mold of the other side from either one of the fixed mold 103 and the movable mold 105. After that (or at the same time as the mold opening), the control device 5 controls a press-out device not shown to press out the molded product from the other mold.

[0171] When the molded product is caused to be separated from the fixed mold 103 as the one mold by the mold opening by the clamping device 7, or the molded product is caused to be pressed out from the fixed mold 103 as the other mold by the press-out device, the control device 5 controls the injection device 9 to cause the molded product to be pressed out from the fixed mold 103 by the plunger 21 and the pressure applying member 49 (hereinafter, sometimes referred to as "protrusion operation").

[0172] Specifically, for example, the control device 5 opens the check valve 45A and the flow control valve 47 as in the pressure increase. Thereby, as in the pressure increase, the molded product is pressed by the plunger 21 and the pressure applying member 49. However, the control at this time can be speed control or pressure control. For example, the control device 5 can perform speed control based on the detected speed of the plunger 21 (and / or the pressure applying member 49) so that the speed of the plunger 21 is the same as the speed of the movable mold 105 or the speed of the press-out pin of the press-out device not shown.

[0173] (plunger retreat)

[0174] After that, the control device 5 can perform an operation for returning to the initial state. For example, the injection piston 33 and the pressure increase piston 35 are caused to retreat, and in addition, the filling of the injection accumulator 39 is performed. These operations can be various modes including known operations.

[0175] For example, the control device 5 supplies the rod side chamber 31r with working fluid from a pump not shown in a state where the discharge of the working fluid from the head side chamber 31h is permitted, and causes the injection piston 33 to retreat. At this time, the working fluid discharged from the head side chamber 31h can be discharged to the injection accumulator 39 or to the tank 41.

[0176] Further, for example, the control device 5 supplies hydraulic fluid from an unillustrated pump to the rod-side chamber 31r in a state in which hydraulic fluid from the head-side chamber 31h is prohibited (in another viewpoint, the retracting piston 33 is retracted). Thereby, the intensifier piston 35 is retracted. Or, in a state in which discharge of hydraulic fluid from the rod-side chamber 31r is prohibited, hydraulic fluid is supplied from an unillustrated pump to the head-side chamber 31h (as necessary, the front-side chamber 31a). Thereby, the intensifier piston 35 is retracted. Hydraulic fluid discharged from the rear-side chamber 31d in conjunction with the retraction of the intensifier piston 35 can be discharged to the injection accumulator 39, or can be discharged to the tank 41.

[0177] When the pressurization of the hydraulic fluid of the head-side chamber 31h by the intensifier piston 35 (in another viewpoint, the pressure-holding process) ends, and the pressure of the head-side chamber 31h (in another viewpoint, the pressure of the communication passage 43d) approaches the pressure of the injection accumulator 39, hydraulic fluid is discharged from the surge accumulator 63. Then, the piston 63b is positioned at the initial position (for example, the drive limit on the liquid chamber 63c side). Further, the intensifier piston 55, from the protruding operation, is subjected to the pressure of the hydraulic fluid of the communication passage 43d, and maintains the state of being positioned at the drive limit on the chamber 107 side.

[0178] As described above, in the present embodiment, the injection device 9 has the injection cylinder 27, the hydraulic device 29. The injection cylinder 27 is linked to the plunger 21 that injects the molding material into the chamber 107. The hydraulic device 29 communicates the injection cylinder 27, the intensifier cylinder 51. The intensifier cylinder 51 is linked to the intensifier member 49 that performs local pressurization of the molding material filled in the chamber 107. The injection cylinder 27 has the injection piston 33 linked to the plunger 21, the cylinder member 31 slidably housed in the injection piston 33. The cylinder member 31 has the head-side chamber 31h that makes the pressure of the hydraulic fluid act on the side opposite to the plunger 21 of the injection piston 33. The hydraulic device 29 has the communication passage 43d. The communication passage 43d communicates the head-side chamber 31h, the first chamber (head-side chamber 53h) of the intensifier cylinder 51. The head-side chamber 53h is a cylinder chamber that supplies hydraulic fluid when the intensifier member 49 is advanced toward the chamber 107.

[0179] In another viewpoint, the molding machine (the die casting machine 1) of the present embodiment has the injection device 9 described above, the mold clamping device 7. The mold clamping device 7 holds the mold (the mold 101) that constitutes the chamber 107.

[0180] Further in another viewpoint, the die molding machine (the die molding die casting machine DC1) of the present embodiment has: the molding machine (the die casting machine 1) described above, the mold (the mold 101) described above, the intensifier member 49 disposed in the mold 101, the intensifier cylinder 51 disposed in the mold 101.

[0181] Further in another aspect, the molding method of the present embodiment has an injection step (broadly, injection) of performing injection using the injection device 9 as described above. Figure 9 (a), Figure 8 (a) and ​ (a)). In the injection step, during at least a portion of the period from the start of injection to the completion of pressure maintenance (all of the period in the present embodiment), the pressure imparted to the working fluid of the head-side chamber 31h of the injection cylinder 27 is imparted to the working fluid of the first chamber (head-side chamber 53h of the pressure cylinder 51) via the communication passage 43d as well.

[0182] Thus, for example, as explained with reference to ​ (a), when increasing the pressure of the head-side chamber 31h to perform pressure boosting, the pressure of the head-side chamber 53h can be increased to perform partial pressure boosting. As a result, it is not necessary to provide a dedicated hydraulic source with respect to the pressure cylinder 51, and the configuration of the hydraulic device 29 becomes simple. Also, by performing partial pressure boosting automatically in conjunction with the timing at which pressure boosting of the plunger 21 is started, control is also simplified. Further, for example, as explained with reference to ​ (a), when supplying working fluid to the head-side chamber 31h to perform injection, the pressure boosting member 49 can be caused to move toward the chamber 107 side. As a result, when the molten material reaches the position of the pressure boosting member 49, the pressure boosting member 49 can be caused to retreat, and the impact pressure can be released toward the communication passage 43d via the pressure cylinder 51.

[0183] In the present embodiment, the area ratio S4 / S3 with respect to the area ratio S2 / S1 can be 0.5 times or more and 1.5 times or less. The area ratio S4 / S3, as already described, is the ratio of the total area (S4) imparted by one or more pressure boosting members 49 driven by one pressure cylinder 51 to the molding material of the chamber 107 with respect to the area (S3) of the working fluid of the first chamber (head-side chamber 53h) against which the pressure of the pressure piston 55 is received. The area ratio S2 / S1 is the ratio of the area (S2) imparted by the plunger 21 to the molding material of the chamber 107 with respect to the area (S1) of the working fluid of the head-side chamber 31h against which the pressure of the injection piston 33 is received.

[0184] In this case, for example, when supercharging and local pressurization are performed, the pressure imparted to the molten metal by the pressurizing member 49 approaches the pressure imparted to the molten metal by the plunger 21. As a result, the possibility that the pressure of the local pressurization is too small or too large is reduced. Furthermore, the quality of the molded product is improved. In another viewpoint, the local pressurization is not to increase the pressure in the portion where the cavity is easily generated, but to contribute to imparting a uniform pressure to the entire molded product. The quality of the molded product is improved based on this viewpoint. In addition, for example, when the impact pressure generated in the molten metal is imparted to the plunger 21 and the pressurizing member 49, the possibility that the difference between the pressure of the working fluid on the side of the pressurizing cylinder 51 and the pressure of the working fluid on the side of the injection cylinder 27 becomes large is reduced. As a result, for example, the possibility that unexpected operation is generated is reduced.

[0185] The area ratio S4 / S3 can be 1.0 times or more and 1.2 times or less with respect to the area ratio S2 / S1.

[0186] In this case, for example, compared with the range of 0.5 times or more and 1.5 times or less described above, since the ratio of S4 / S3 with respect to S2 / S1 approaches 1.0, the effects described with respect to the range of 0.5 times or more and 1.5 times or less are improved. In addition, due to the solidification of the molten metal in the chamber 107, the pressure of the plunger 21 is hardly transmitted to the molten metal at a position away from the plunger 21 (for example, the overflow portion 107b). The present applicant has obtained an experimental result that a pressure of about eight-tenths of the pressure imparted to the molten metal by the plunger 21 is transmitted to the molten metal at a position away from the sleeve 19. Thus, by making the ratio of S4 / S3 to S2 / S1 be the range described above and making the pressure imparted to the molten metal by the pressurizing member 49 be equal to or more than the pressure imparted to the molten metal by the plunger 21, the effects of pressurizing the molten metal uniformly can be improved.

[0187] The injection device 9 can also have a throttle valve 59A provided in the communication passage 43d and having a constant opening degree throughout the molding cycle.

[0188] In this case, for example, it is possible to delay the transmission of the pressure from the injection accumulator 39 or the injection cylinder 27 to the pressurizing cylinder 51. As a result, for example, when the injection is started by supplying the working fluid from the injection accumulator 39 to the head side chamber 31h of the injection cylinder 27, the possibility that the pressure is released to the pressurizing cylinder 51 and the control delay becomes large is reduced. Also / or, when the supercharging is started by pressurizing the working fluid of the head side chamber 31h with the supercharging plunger 35, the possibility that the pressure is released to the pressurizing cylinder 51 and the control delay becomes large is reduced. In addition, since the throttle valve 59A is provided, compared with the case where the cross-sectional area of a part of the communication passage 43d is reduced (this case is also included in the technology of the present disclosure), the timing of the injection and the local pressurization is easily adjusted according to the shape and size of the chamber 107 and the like by adjusting the opening degree of the throttle valve 59A or replacing the throttle valve 59A.

[0189] In the injection device 9, the pressurizing member 49 can also be brought to the drive limit on the side of the cavity 107 using the pressure of the first chamber (the head-side chamber 53h of the pressurizing cylinder 51) before the molding material reaches the position at which the pressurizing member 49 is disposed inside the cavity 107. Note that in the present embodiment, the pressurizing member 49 is brought to the drive limit on the side of the cavity 107 before the time tO. Other than this, the pressurizing member 49 can also be brought to the drive limit on the side of the cavity 107 after the time tO and before the time tl, after the time tl and before the time t2, or after the time t2 and before the time t3, for example.

[0190] In this case, an operation of moving the pressurizing member 49 to the side opposite the cavity 107 by the pressure of the melt, for example, can be performed. That is, the impact pressure of the melt is released to the communication passage 43d via the pressurizing member 49 and the pressurizing cylinder 51, but the impact pressure of the melt can be reduced.

[0191] The injection device 9 can also have a surge accumulator 63 that opens to the first chamber (the head-side chamber 53h of the pressurizing cylinder 51).

[0192] In this case, the impact pressure released to the communication passage 43d can be absorbed by the surge accumulator 63, for example. As a result, the impact pressure released to the communication passage 43d is reduced in its effect on the injection cylinder 27. Furthermore, the possibility of an unexpected operation is reduced. Note that accumulators for absorbing impact pressure are known, but the configuration of absorbing impact pressure via the pressurizing cylinder 51 for local pressurization is novel.

[0193] In the injection device 9, the pressure can be transmitted between the surge accumulator 63 and the first chamber (the head-side chamber 53h of the pressurizing cylinder 51) to each other from before the start of injection until the completion of pressurization. As such a method, for example, a method in which no valve is provided between the surge accumulator 63 and the head-side chamber 53h, and a method in which a valve is provided but opened for one or more molding cycles can be cited.

[0194] In this case, the surge accumulator 63 is basically connected to the head-side chamber 53h, unlike the injection accumulator 39 that transmits the pressure between the surge accumulator 63 and the head-side chamber 53h of the pressurizing cylinder 51 after the start of injection, for example. Thus, for example, the control is not complicated, and the impact pressure can be reliably absorbed.

[0195] The surge accumulator 63 can also have a liquid chamber 63c that communicates with the first chamber (the head side chamber 53h of the pressurizing cylinder 51), and a piston 63b that receives the pressure of the working fluid of the liquid chamber 63c. The maximum change amount (dV2) of the volume of the liquid chamber 63c according to the movable range of the piston 63b can also be 1.0 times or more and 1.2 times or less with respect to the maximum change amount (dV1) of the volume of the head side chamber 53h according to the movable range of the piston 63b of the pressurizing cylinder 51.

[0196] In this case, for example, by making dV2 / dV1 1.0 times or more, the entire amount of the working fluid discharged from the head side chamber 53h by the impact pressure can be absorbed by the surge accumulator 63. As a result, the impact pressure can be more reliably absorbed. In addition, by making dV2 / dV1 1.2 times or less, when the working fluid is supplied from the injection cylinder 27 to the head side chamber 53h for partial pressurization, the amount of the working fluid absorbed by the surge accumulator 63 is reduced. As a result, for example, with respect to the pressurization of the plunger 21, the possibility of excessive delay of the partial pressurization is reduced.

[0197] The injection device 9 can also have an injection accumulator 39 that supplies the working 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 at the drive limit on the side of the liquid chamber 63c can also be 0.8 times or more and 1.2 times or less with respect to the pressure at the start of release of the injection accumulator 39 (time t0 in the present embodiment).

[0198] In this case, for example, when the working fluid is supplied from the injection accumulator 39 to the head side chamber 31h, the possibility of the working fluid being absorbed by the surge accumulator 63 is reduced. Further, the control delay in the injection cylinder 27 is reduced. In addition, the surge accumulator 63 can maintain the state in which the piston 63b is at the drive limit on the side of the liquid chamber 63c, and thus the maximum change amount (dV2) of the volume of the liquid chamber 63c can be used for the absorption of the impact pressure.

[0199] The hydraulic device 29 can also have a check valve 45C and a throttle valve 59B. The check valve 45C is located on the side closer to the head side chamber 31h of the injection cylinder 27 than the position of the surge accumulator 63 in the connecting passage 43d, allows flow from the side of the head side chamber 31h to the side of the first chamber (the head side chamber 53h of the pressurizing cylinder 51), and prohibits flow in the opposite direction. The throttle valve 59B bypasses the check valve 45C.

[0200] In this case, for example as described, the influence of the pressure not absorbed by the surge absorber 63 on the operation of the injection cylinder 27 can be reduced. On the other hand, after the absorption of the surge pressure of the surge absorber 63, the working fluid of the surge absorber 63 can be caused to flow to the head side chamber 31h side, and the surge absorber 63 can be caused to return to the initial position. The flow at this time is limited by the throttle valve 59B, and thus the influence of the surge absorber 63 on the operation of the injection cylinder 27 can be reduced.

[0201] The injection cylinder 27 can also have a booster piston 35 housed in the cylinder member 31. The booster piston 35 can also have a first face 35c that receives pressure from the head side chamber 31h, and a second face 35d that receives pressure from the rear side chamber 31b on the opposite side thereof. The area of the second face 35d can be larger than the area of the first face 35c.

[0202] In this case, for example the pressure imparted to the head side chamber 31h of the injection cylinder 27 can be either the pressure as it is from the hydraulic pressure source (in the illustrated example, the injection absorber 39) and the pressure boosted by the boosting action of the booster piston 35. As a result, for example, the injection using the plunger 21 and the preparation for the absorption of the surge pressure using the pressure applying member 49 (advancement of the pressure applying member 49) can be performed in accordance with the former pressure, and the boosting using the plunger 21 and the partial boosting using the pressure applying member 49 can be performed in accordance with the latter pressure. That is, the known injection using the known booster type injection cylinder 27 can be performed, and on the other hand, the preparation for the absorption of the surge pressure and the partial boosting can be performed. That is, the effect of simplification of the configuration is improved.

[0203] <Second Embodiment>

[0204] ​ is a view showing the configuration of the main part of the die casting machine DC2 of the second embodiment, and corresponds to ​ In the die casting machine DC2, the drive section 223 of the injection device 209 is different from that of the first embodiment. Specifically, as follows.

[0205] In the first embodiment, the injection cylinder 27 is of a so-called booster type structure having the injection piston 33 and the booster piston 35. On the other hand, in the second embodiment, the injection cylinder 227 has the injection piston 33 and does not have the booster piston 35, and is of a so-called single cylinder type structure. The cylinder member 231 of the injection cylinder 227 is of a structure in which the large diameter cylinder 31y of the cylinder member 31 of the first embodiment is canceled, and the rear end of the small diameter cylinder 31x is plugged, has the rod side chamber 31r and the head side chamber 31h, and does not have the front side chamber 31a and the rear side chamber 31b.

[0206] The hydraulic device 229 of the present embodiment can also have the injection accumulator 39A and the pressure boosting accumulator 39B. The injection accumulator 39A and the pressure boosting accumulator 39B can have the same configuration or different configurations. For example, the pressure boosting accumulator 39B can be configured to be able to store pressure higher than the pressure of the injection accumulator 39A. Note that, unlike the example shown, the single-cylinder injection cylinder 227 can be combined with a hydraulic device that has the injection accumulator 39A and does not have the pressure boosting accumulator 39B.

[0207] As understood from the comparison between the hydraulic circuit 243 of the present embodiment and the hydraulic circuit 43 of the first embodiment, the injection accumulator 39A can correspond to the injection accumulator 39 of the first embodiment. The pressure boosting accumulator 39B is connected to the head-side chamber 31h via the flow path 43b. The check valve 45B is provided in the flow path 43b to prohibit or allow the flow of the working fluid between the pressure boosting accumulator 39B and the head-side chamber 31h.

[0208] The operation of the injection device 209 of the second embodiment can be substantially the same as that of the injection device 9 of the first embodiment.

[0209] However, instead of supplying the working fluid from the injection accumulator 39 to the rear-side chamber 31b in the first embodiment, the working fluid is supplied from the pressure boosting accumulator 39B to the head-side chamber 31h. At least at the time when the pressure boosting start condition described in the first embodiment is satisfied, the pressure of the pressure boosting accumulator 39B is higher than that of the injection accumulator 39A. Thus, after the injection in the narrow sense is performed by supplying the working fluid from the injection accumulator 39A to the head-side chamber 31h, the pressure boosting can be performed at a higher pressure than the pressure of the head-side chamber 31h by supplying the working fluid from the pressure boosting accumulator 39B to the head-side chamber 31h.

[0210] Also, as in the first embodiment, when the injection in the narrow sense is performed, the pressure of the injection accumulator 39A can be used to position the driving limit of the pressurizing member 49 on one side of the chamber 107, and the preparation for absorbing the impact pressure can be performed. In addition, when the pressure boosting is performed, the pressure of the pressure boosting accumulator 39B can be used to locally pressurize the pressurizing member 49.

[0211] As described above, in the present embodiment, the hydraulic device 229 has the communication path 43d. The communication path 43d communicates the head-side chamber 31h of the injection cylinder 27 and the first chamber (head-side chamber 53h) of the pressurizing cylinder 51. The head-side chamber 53h is a cylinder chamber to which the working fluid is supplied when the pressurizing member 49 is advanced toward the chamber 107.

[0212] Therefore, the same effects as the first embodiment can be obtained. For example, when pressurizing by increasing the pressure in the cephalic chamber for 31 hours, local pressurization can be performed by increasing the pressure in the cephalic chamber for 53 hours, thus simplifying the configuration and control, and enabling local pressurization to be performed at appropriate timing.

[0213] The hydraulic system 229 may also include an injection accumulator 39A, a booster accumulator 39B, and a hydraulic circuit 243. The injection accumulator 39A and the booster accumulator 39B are respectively connected to the head chamber 31h of the injection cylinder 227. The hydraulic circuit 243 controls the flow of working fluid from the injection accumulator 39A and the booster accumulator 39B to the head chamber 31h. (See control device 5) ​ The hydraulic circuit 243 can also be controlled so that working fluid is supplied to the head chamber 31h only from the injection accumulator 39A and the pressurization accumulator 39B, and the molding material is injected into the chamber 107. Then, working fluid is supplied to the head chamber 31h from the pressurization accumulator 39B to pressurize the molding material in the chamber 107.

[0214] In this case, for example, similar to the case where a pressurized injection cylinder 27 is used, both pressures can be applied to the head chamber 31h. As a result, similar to the first embodiment, in addition to the injection of the plunger 21 and the pressurization operation, preparations for absorbing the impact pressure using the pressurizing member 49 can be performed, and local pressurization using the pressurizing member 49 can be performed. Furthermore, unlike the first embodiment, a single-cylinder injection cylinder 227 can be used, and a higher casting pressure can be obtained.

[0215] <Third Implementation>

[0216] ​ This diagram shows the main components of the die-casting machine DC3 with mold according to the third embodiment, compared with the first embodiment. ​ Corresponding. However, due to the paper, and ​ In contrast, some of the reference numerals for the injection cylinder 27 are omitted. In the die-casting machine DC3 with mold, the drive unit 323 of the injection device 309 has a different structure than that of the first embodiment. Specifically, it is shown below.

[0217] In the first embodiment, the drive unit 23 of the injection device 9 is fully hydraulic. However, as with the drive unit 323 of the injection device 309 in this embodiment, the drive unit can also be a hybrid type combining hydraulic and electric power. Various configurations of hybrid drive units have been proposed to date, and any of them can be used. In addition, new configurations can also be used. ​ An example of a hybrid drive unit.

[0218] ​The illustrated drive section 323 has an electric drive device 65. The drive device 65 has, for example, a rotary electric motor 67, a conversion mechanism 69 that converts the rotation of the electric motor 67 into linear motion (and forward motion). The drive device 65 is linked to the plunger 21 (in another viewpoint, the link member 25, the piston rod 37, or the injection piston 33) via a link portion 71.

[0219] The electric motor 67 can also be a linear motor. The conversion mechanism 69 is a screw mechanism (ball screw mechanism or sliding screw mechanism) in the illustrated example. The conversion mechanism 69 can also be a rack and pinion mechanism or the like. In addition, the drive device 65 can include a gear mechanism that transmits the rotation of the electric motor 67 and / or a belt and pulley mechanism. The link portion 71 can link the drive device 65 and the plunger 21 throughout one or more molding cycles, can be configured to include a snap-fit structure and / or a detachment mechanism, and can link the drive device 65 and the plunger 21 in a process of a portion of a molding cycle.

[0220] The electric drive device 65 can also be appropriately used.

[0221] For example, from the start of injection to the completion of pressure maintenance, the plunger 21 can be driven only by hydraulic drive force, as in the first embodiment, in a state in which the plunger 21 and the drive device 65 are not linked. Thereafter, the drive device 65 can be linked to the plunger 21, and the plunger 21 can be retracted by the drive force of the drive device 65. At this time, the working fluid discharged from the head-side chamber 31h can be filled into the injection accumulator 39.

[0222] In addition, for example, low-speed injection can be performed by the drive device 65, and thereafter, the drive device 65 and the plunger 21 can be unlinked, and the operation from high-speed injection to the completion of pressure maintenance can be performed by hydraulic drive force, as in the first embodiment. Note that, in this operation mode, the retraction of the plunger 21 by the drive device 65 can or can not be performed.

[0223] Note that, as understood from the above description, the same reference numerals as in the first embodiment can be attached to the hydraulic device and the hydraulic circuit for convenience, but the configuration of the hydraulic device and the hydraulic circuit can be modified depending on the role of the drive device 65. In the hybrid drive section, the rod-side chamber 31r can be opened to the atmosphere, or the piston rod 37 and the injection piston 33 can be made the same diameter.

[0224] As described above, in the present embodiment, the hydraulic device 29 has the communication path 43d. The communication path 43d communicates the head side chamber 31h of the injection cylinder 27 and the first chamber (head side chamber 53h) of the pressurizing cylinder 51. The head side chamber 53h is a cylinder chamber that supplies the working fluid when the pressurizing member 49 is advanced toward the chamber 107. Thus, for example, the same effects as those of the first embodiment can be achieved.

[0225] As shown in the present embodiment, the injection device 309 can also have the motor 67 coupled to the injection piston 33.

[0226] In this case, for example, the burden on the hydraulic drive device can be reduced. As a result, for example, the consumed energy can be reduced and / or the influence of the working fluid (oil) on the environment can be reduced.

[0227] <Fourth Embodiment>

[0228] ​ is a view showing the configuration of the main part of the die casting machine DC4 of the fourth embodiment, and corresponds to the view of the first embodiment ​ In the die casting machine DC4, the drive section 423 of the injection device 409 is different from that of the first embodiment. Specifically, as shown below.

[0229] In the first embodiment, the drive section 23 of the injection device 9 is of the full hydraulic type. However, the drive section can also be of the full electric type, as in the drive section 423 of the injection device 409 of the present embodiment. The drive section of the full electric type has various configurations proposed so far, any one of which can be used, and a new configuration can also be used. ​ One example of the drive section of the full electric type is shown.

[0230] ​ The drive section 423 shown is provided with an electric drive device 73 in addition to the electric drive device 65 shown in the third embodiment ​ ). The drive device 73 has, for example, a rotary motor 75, and a conversion mechanism 77 that converts the rotation of the motor 75 into linear motion (advancing motion). The configuration of the drive device 65 can be used as it is, provided that no contradiction or the like occurs.

[0231] 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 coupled to the drive device 73, is driven by an electric drive force, and boosts the working fluid of the head side chamber 31h. However, the pressure boosting member 435 does not have the small-diameter piston 35x and the large-diameter piston 35y, and cannot obtain the effect of boosting the pressure of the rear side chamber 31d and transmitting it to the head side chamber 31h. The pressure boosting member 435 can slide along the cylinder member 431, or can have a smaller diameter than the inner diameter of the cylinder member 431.

[0232] The hydraulic device 429 has, for example, a flow path (reference numeral is omitted) connecting the head side chamber 31h and the tank 41, and a check valve 45D provided in the flow path. The check valve 45D allows the flow of the working fluid from the tank 41 to the head side chamber 31h and prohibits the flow of the working fluid in the opposite direction when the check valve 45D is opened due to the introduction of a pilot pressure, and prohibits the flow of the working fluid in the opposite direction when the pilot pressure is not introduced. Note that the rod side chamber 31r and the rear side chamber 31d can be open to the atmosphere or can be filled with the working fluid. However, the head side chamber 31h is filled with the working fluid.

[0233] 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 coupled to the drive device 73, is driven by an electric drive force, and boosts the working fluid of the head side chamber 31h. However, the pressure boosting member 435 does not have the small-diameter piston 35x and the large-diameter piston 35y, and cannot obtain the effect of boosting the pressure of the rear side chamber 31d and transmitting it to the head side chamber 31h. The pressure boosting member 435 can slide along the cylinder member 431, or can have a smaller diameter than the inner diameter of the cylinder member 431.

[0234] As described above, in the present embodiment, the hydraulic device 429 has the communication path 43d. The communication path 43d communicates the head side chamber 31h of the injection cylinder 427 and the first chamber (head side chamber 53h) of the pressure boosting cylinder 51. The head side chamber 53h is a cylinder chamber that supplies the working fluid when the pressure boosting member 49 is advanced toward the cavity 107. Thus, for example, the same effects as those of the first embodiment can be obtained.

[0235] In the above embodiments, the die casting machines DC1 to DC4 are each an example of a die casting machine. The die casting machines 1 and the like included therein are each an example of a molding machine. The head side chamber 53h of the pressure boosting cylinder 51 is an example of a first chamber. The piston 63b is an example of a surge piston.

[0236] The present application is not limited to the above embodiments and modified examples, and can be implemented in various ways.

[0237] The molding machine is not limited to a die casting machine and is not limited to. For example, the molding machine can be another metal molding machine, can be an injection molding machine that molds resin, or can be a molding machine that molds a material in which wood powder mixed with a thermoplastic resin or the like. In addition, the molding machine is not limited to a horizontal split mold horizontal injection, and for example, can be a vertical split mold vertical injection, a vertical split mold horizontal injection, or a horizontal split mold vertical injection. The die casting machine is not limited to a cold chamber machine, and for example, can be a hot chamber machine. The working fluid is not limited to oil, and for example, can be water.

[0238] The configurations of the multiple embodiments can also be appropriately combined. For example, in the first embodiment, the second embodiment of the pressure boosting accumulator that supplies the working fluid to the rear chamber of the pressure boosting type injection cylinder can also be provided. The drive device 65 illustrated in the third embodiment can also be applied to the second embodiment (configuration having an injection accumulator that opens to the head side chamber and a pressure boosting accumulator). In the hybrid type injection device 309 of the third embodiment, the injection cylinder 427 of the fourth embodiment (another viewpoint, the pressure boosting member 435 instead of the pressure boosting piston 35) can also be provided instead of the injection cylinder 27, and a hybrid type injection device having the injection accumulator 39, the drive devices 65 and 73 can be configured.

[0239] The injection is not limited to include low speed injection and high speed injection, and for example, can also be performed at a low speed to fill in a laminar flow. The pressure boosting type cylinder can also be a structure in which a cylinder body member that houses an injection piston and a cylinder body member that houses a pressure boosting piston are separated from each other and connected by a flow path. In the description of the embodiments, for convenience, each valve is named according to the name of the type of valve illustrated in the drawing (check valve, switching valve). However, each valve can also be a valve other than the type used in the name.

[0240] The pressure boosting member for local pressure boosting can also function as an ejection pin that ejects a molded product configured by solidifying a molding material from a mold. In this case, the ejection cylinder as a pressure boosting cylinder can also communicate with the injection cylinder.

[0241] Based on the present disclosure, further, a concept characterized by absorbing an impact pressure via a pressure boosting cylinder (hereinafter, sometimes referred to as "the present concept") can be extracted. For example, the following concept can be extracted.

[0242] (Concept 1)

[0243] A hydraulic device (another viewpoint, a pressure boosting device, an injection device, a molding machine, or a molding machine with a mold) that communicates with a pressure boosting cylinder that is linked to a pressure boosting member that can perform local pressure boosting of a molding material filled in a chamber,

[0244] having a surge accumulator that communicates with a first chamber that is supplied with a working fluid when the pressure boosting member of the pressure boosting cylinder advances toward the chamber,

[0245] The pressure is allowed to be transmitted between the surge accumulator and the first chamber during a period from when the molding material reaches the pressurizing member to when the molding material fills the cavity.

[0246] Note that, as described in the embodiments, the allowance of the transmission of the pressure between the surge accumulator and the first chamber can also be realized by not providing the valve or by causing the valve to be open. In Concept 1, the surge accumulator is determined to be different from the other accumulators (e.g., the injection accumulator) on the basis of the viewpoint of the action of the pressure. However, the surge accumulator can also be determined to be different from the other accumulators (in other words, the present concept is different from the related art) in other viewpoints instead of or in addition to the above-described viewpoint. As such a viewpoint, for example, the viewpoint of the maximum variation amount of 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 the configuration of the flow path connected to the surge accumulator (e.g., a bypass flow path) can be cited.

[0247] Concept (the present concept) characterized by absorbing the impact pressure via the pressurizing cylinder as shown in the embodiments of the present disclosure can also be applied to a configuration in which the first chamber of the pressurizing cylinder and the head-side chamber of the injection cylinder are communicated, and can also be applied to a configuration in which the first chamber and the head-side chamber are not communicated, unlike the embodiments of the present disclosure. As the latter configuration, for example, a configuration in which the hydraulic system for driving the pressurizing cylinder and the hydraulic system for driving the injection cylinder are not connected at all can be cited.

[0248] Explanation of Reference Numerals

[0249] 1 … die casting machine (molding machine), 5 … control device, 9 … injection device, 19 … sleeve, 21 … plunger, 27 … injection cylinder, 29 … hydraulic device, 31 … (cylinder body member of the injection cylinder), 31h … head-side chamber (of the injection cylinder), 33 … injection piston, 43d … communication path, 49 … pressurizing member, 51 … pressurizing cylinder, 53h … head-side chamber (first chamber) (of the pressurizing cylinder), 101 … mold (mold), 107 … cavity (of the mold).

Claims

1. An ejection device, characterized by, Having: an injection cylinder linked to a plunger that injects a molding material into a chamber; a hydraulic device that communicates with the injection cylinder and a pressurizing cylinder linked to a pressurizing member that locally pressurizes the molding material filled in the chamber; the injection cylinder having: an injection piston linked to the plunger; a cylinder member that slidably houses the injection piston; the cylinder member having a head-side chamber that allows the pressure of the working fluid to act on the face of the injection piston on the side opposite to the plunger, the hydraulic device having a communication path that communicates the head-side chamber with a first chamber that is supplied with the working fluid when the pressurizing member of the pressurizing cylinder advances toward the chamber, 2. An injection device, characterized in that the ratio S4 / S3 of the total area S4 that the pressurizing member(s) driven by one of the pressurizing cylinders imparts pressure to the molding material in the chamber with respect to the area S3 of the working fluid of the first chamber that the piston of the pressurizing cylinder receives pressure from, is 0.5 times or more and 1.5 times or less than the ratio S2 / S1 of the area S2 that the plunger imparts pressure to the molding material in the chamber with respect to the area S1 of the working fluid of the head-side chamber that the injection piston receives pressure from. Having: an injection cylinder linked to a plunger that injects a molding material into a chamber; a hydraulic device that communicates with the injection cylinder and a pressurizing cylinder linked to a pressurizing member that locally pressurizes the molding material filled in the chamber; the injection cylinder having: an injection piston linked to the plunger; a cylinder member that slidably houses the injection piston; the cylinder member having a head-side chamber that allows the pressure of the working fluid to act on the face of the injection piston on the side opposite to the plunger, the hydraulic device having a communication path that communicates the head-side chamber with a first chamber that is supplied with the working fluid when the pressurizing member of the pressurizing cylinder advances toward the chamber, the ratio S4 / S3 of the total area S4 that the pressurizing member(s) driven by one of the pressurizing cylinders imparts pressure to the molding material in the chamber with respect to the area S3 of the working fluid of the first chamber that the piston of the pressurizing cylinder receives pressure from, is 0.5 times or more and 1.5 times or less than the ratio S2 / S1 of the area S2 that the plunger imparts pressure to the molding material in the chamber with respect to the area S1 of the working fluid of the head-side chamber that the injection piston receives pressure from.

3. The injection device according to claim 2, wherein the ratio S4 / S3 is 1.0 times or more and 1.2 times or less than the ratio S2 / S1.

4. The injection device according to any one of claims 1 to 3, further comprising a surge accumulator that communicates with the first chamber.

5. The injection device according to claim 4, wherein pressure is allowed to be transmitted between the surge accumulator and the first chamber from before the start of injection to the completion of pressurization.

6. The injection device according to claim 4, wherein the surge accumulator has: a liquid chamber that communicates with the first chamber; a surge piston that receives the pressure of the working fluid of the liquid chamber; the maximum change amount of the volume of the liquid chamber according to the movable range of the surge piston is 1.0 times or more and 1.2 times or less than the maximum change amount of the volume of the first chamber according to the movable range of the piston of the pressurizing cylinder.

7. The injection apparatus according to claim 4, wherein the hydraulic pressure device has: an injection accumulator that supplies the working fluid to the head-side chamber; the surge accumulator; the surge accumulator has: a liquid chamber that communicates with the first chamber; a surge piston that receives a pressure of the working fluid of the liquid chamber; and a pressure of the surge accumulator when the surge piston is at a drive limit on one side of the liquid chamber is 0.8 times or more and 1.2 times or less relative to a pressure at the start of release of the injection accumulator.

8. The injection apparatus according to claim 4, wherein the hydraulic pressure device has: a check valve that is located closer to the one side of the head-side chamber than a position at which the surge accumulator in the communication passage is connected, allows flow from the one side of the head-side chamber to the one side of the first chamber, and prohibits flow in the opposite direction thereof; and a throttle valve that bypasses the check valve. An injection cylinder that has a plunger that injects a molding material into a cavity; a hydraulic pressure device that communicates with the injection cylinder and a pressurizing cylinder that is connected to a pressurizing member that performs local pressurization of the molding material filled in the cavity; the injection cylinder has: an injection piston that is connected to the plunger; a cylinder member that slidably houses the injection piston; the cylinder member has a head-side chamber that causes a pressure of the working fluid to act on a surface of the injection piston on the opposite side of the plunger; the hydraulic pressure device has a communication passage that communicates the head-side chamber with a first chamber that is supplied with the working fluid when the pressurizing cylinder advances the pressurizing member toward the cavity; further has a surge accumulator that communicates with the first chamber and an injection accumulator that supplies the working fluid to the head-side chamber; the surge accumulator has: a liquid chamber that communicates with the first chamber; a surge piston that receives a pressure of the working fluid of the liquid chamber; and a pressure of the surge accumulator when the surge piston is at a drive limit on one side of the liquid chamber is 0.8 times or more and 1.2 times or less relative to a pressure at the start of release of the injection accumulator.

10. The injection apparatus according to claim 9, wherein from before the start of injection to when pressurization is completed, pressure is allowed to be transmitted between the surge accumulator and the first chamber.

11. The injection apparatus according to claim 9, wherein a maximum amount of change in the volume of the liquid chamber according to a movable range of the surge piston is 1.0 times or more and 1.2 times or less relative to a maximum amount of change in the volume of the first chamber according to a movable range of the piston of the pressurizing cylinder.

12. The injection apparatus according to claim 9, wherein the hydraulic pressure device has: a check valve that is located closer to the one side of the head-side chamber than a position at which the surge accumulator in the communication passage is connected, allows flow from the one side of the head-side chamber to the one side of the first chamber, and prohibits flow in the opposite direction thereof; and a throttle valve that bypasses the check valve.

13. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, wherein ​ ​ ​ 9. An injection device, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The pressure imparted to the working fluid of the head-side chamber during at least a part of the period from the start of injection to the completion of pressure maintenance is imparted to the working fluid of the first chamber via the communication passage as well.

14. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, characterized by comprising a throttle valve provided in the communication passage and having a constant opening degree during a molding cycle.

15. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, characterized by comprising a drive limiter for the pressurizing member provided on the side of the cavity, which utilizes the pressure of the first chamber before the molding material reaches a position at which the pressurizing member is provided in the cavity.

16. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, characterized by comprising a booster piston housed in the cylinder member of the injection cylinder, the booster piston having a first face receiving pressure from the head-side chamber and a second face receiving pressure from a rear-side chamber on the opposite side thereof, the area of the second face being larger than the area of the first face.

17. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, characterized by further comprising a control device for controlling the hydraulic device, the hydraulic device further comprising: an injection accumulator communicating with the head-side chamber; a booster accumulator communicating with the head-side chamber; a hydraulic circuit for controlling the flow of working fluid from the injection accumulator and the booster accumulator to the head-side chamber; the control device controlling the hydraulic circuit so that working fluid is supplied to the head-side chamber only from the former of the injection accumulator and the booster accumulator and the molding material is injected into the cavity, and thereafter, working fluid is supplied to the head-side chamber from the booster accumulator to pressurize the molding material in the cavity.

18. The injection apparatus according to any one of claims 1 to 3 and 10 to 12, characterized by further comprising an electric motor coupled to the injection piston. the injection apparatus according to any one of claims 1 to 18; a clamping device for holding a mold constituting the cavity. the molding machine according to claim 19; the mold; the pressurizing member provided in the mold; 19. A forming machine characterized by the pressurizing cylinder provided in the mold.

21. A molding method characterized by comprising: an injection step of injecting using the injection apparatus according to any one of claims 1 to 18, 20. A tape molding machine characterized by comprising: in the injection step, the pressure imparted to the working fluid of the head-side chamber during at least a part of the period from the start of injection to the completion of pressure maintenance is imparted to the working fluid of the first chamber via the communication passage as well. ​ ​ ​ ​ ​ ​ ​

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