Die casting equipment and die casting method

Abstract

To prevent a situation where a pressing rod cannot be pulled out from a diecast product coagulating in a runner.SOLUTION: A diecasting device 1 comprises a diecasting die 10 that demarcates a cavity 53 and a runner 50 communicating with the cavity 53, first pressing means 24 and 25 that charge molten metal toward the inside of the cavity 53, second pressing means 40, 41 and 43 that press molten metal in the runner 50, where the second pressing means 40, 41 and 43 include cylindrical shaft-like second pressing rods 43 that move back and forth toward a direction nearly orthogonal to a mold-opening direction of the diecasting die 10. The device further comprises third pressing means 63 that assists the second pressing means 40, 41 and 43 that press molten metal in the runner 50.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a die casting apparatus and a die casting method, and more particularly to a die casting apparatus provided with a pressurizing means for pressurizing a runner of a die casting mold, and a die casting method carried out using the die casting apparatus. [Background technology]

[0002] Conventionally, there has been known a die casting apparatus that includes a die casting mold that defines a cavity and a runner that communicates with the cavity, a first pressurizing means that fills the cavity with molten metal, and a second pressurizing means that pressurizes the molten metal in the runner, the second pressurizing means including a second pressurizing rod that advances and retreats in a direction substantially perpendicular to the mold opening direction of the die casting mold (see, for example, Patent Document 1 below). With such a die casting apparatus, it is possible to improve the quality of a die cast product formed in the cavity by pressurizing the molten metal in the runner with the second pressurizing rod of the second pressurizing means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-224650 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the die-casting apparatus disclosed in the above-mentioned Patent Document 1, there was a risk that the second pressurizing rod of the second pressurizing means, which pressurized the molten metal in the runner, would become unable to be removed from the die-cast product that had solidified in the runner, leaving room for improvement.

[0005] The present invention has been made in consideration of the problems existing in the prior art described above, and its purpose is to provide a die-casting apparatus that maintains the quality of the die-cast product molded in the cavity while avoiding problems such as the second pressure rod of the second pressure means becoming stuck in the die-cast product that has solidified in the runner, and a die-casting method using the die-casting apparatus. [Means for solving the problem]

[0006] The present invention will be described below. In order to facilitate understanding of the present invention, reference numbers in the accompanying drawings are given in parentheses, but the present invention is not limited to the illustrated forms.

[0007] The die casting device according to the present invention ( 1) The die casting device (1, 2) comprises a die casting die (10) defining a cavity (53) and a runner (50) communicating with the cavity (53), a first pressurizing means (24, 25) for filling molten metal into the cavity (53), and a second pressurizing means (40, 41, 43) for pressurizing the molten metal in the runner (50), the second pressurizing means (40, 41, 43) including a cylindrical second pressurizing rod (43) that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die casting die (10), and further comprises a third pressurizing means (63) for assisting the second pressurizing means (40, 41, 43) in pressurizing the molten metal in the runner (50). The third pressurizing means (63) includes a cylindrical third pressurizing rod (63) for pressurizing the molten metal in the runner (50), and a boss shape (50C) that bulges toward the third pressurizing rod (63) is formed at a molten metal pressurizing position of the runner (50) that is pressurized by the third pressurizing rod (63). It is characterized by the above.

[0008] Another die-casting apparatus (1, 2) according to the present invention is a die-casting apparatus (1, 2) including a die-casting die (10) defining a cavity (53) and a runner (50) communicating with the cavity (53), a first pressurizing means (24, 25) for filling molten metal into the cavity (53), and a second pressurizing means (40, 41, 43) for pressurizing the molten metal in the runner (50), wherein the second pressurizing means (40, 41, 43) includes a cylindrical second pressurizing rod (43) that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die-casting die (10), and The runner (50) is provided with a third pressurizing means (63) which assists the second pressurizing means (40, 41, 43) in pressurizing the molten metal in the runner (50), the third pressurizing means (63) including a cylindrical third pressurizing rod (63) which pressurizes the molten metal in the runner (50), the pressurizing stroke of the second pressurizing rod (43) which pressurizes the molten metal in the runner (50) is a distance approximately 1.5 times the shaft diameter of the second pressurizing rod (43), and the pressurizing stroke of the third pressurizing rod (63) which pressurizes the molten metal in the runner (50) is a distance approximately half the distance of the second pressurizing rod (43).

[0009] Further, still another die casting apparatus (1, 2) according to the present invention is a die casting apparatus (1, 2) comprising a die casting mold (10) defining a cavity (53) and a runner (50) communicating with the cavity (53), a first pressurizing means (24, 25) for filling molten metal into the cavity (53), and a second pressurizing means (40, 41, 43) for pressurizing the molten metal in the runner (50), wherein the second pressurizing means (40, 41, 43) includes a cylindrical second pressurizing rod (43) that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die casting mold (10). the die casting apparatus further comprising a third pressurizing means (63) assisting the second pressurizing means (40, 41, 43) which pressurizes the molten metal in the runner (50), the third pressurizing means (63) including a cylindrical third pressurizing rod (63) which pressurizes the molten metal in the runner (50), and the third pressurizing rod (63) of the third pressurizing means (63) starts the pressurizing operation on the molten metal in the runner (50) with a delay after the second pressurizing rod (43) of the second pressurizing means (40, 41, 43) starts the pressurizing operation on the molten metal in the runner (50).

[0010] Ma Ta, In the die casting apparatus (1, 2) according to the present invention, The second pressure rod (43) and the third pressure rod (63) can be disposed so as not to interfere with each other when pressurizing the molten metal in the runner (50).

[0011] Sara To,In the die casting apparatus (1, 2) according to the present invention, the third pressurizing means (63) can be installed on the side of the movable die (30) constituting the die casting mold (10).

[0012] Also moreover In the die casting apparatus (1, 2) according to the present invention, the second pressurizing means (40, 41, 43) and the third pressurizing means (63) are each controlled by an individual control means. Can It is possible.

[0013] The die casting method according to the present invention is characterized in that die casting is carried out by any one of the die casting apparatuses (1, 2) described above. Effect of the Invention

[0014] According to the present invention, it is possible to provide a die casting apparatus that maintains the quality of the die cast product molded in the cavity while preventing problems such as the second pressure rod of the second pressure means becoming stuck in the die cast product that has solidified in the runner, and a die casting method using the die casting apparatus. [Brief description of the drawings]

[0015] [Figure 1] 4 is a cross-sectional view showing a state in which the main pressure rod is in a retreated position in the die casting apparatus according to the embodiment of the present invention. FIG. [Diagram 2] 4 is a cross-sectional view showing a state in which the main pressure rod is in an advanced position in the die casting apparatus according to the present embodiment. FIG. [Diagram 3] FIG. 2 is a diagram for explaining a characteristic configuration of the die casting device according to the present embodiment, and in particular, is a cross-sectional view showing the periphery of a main pressure rod. [Figure 4] 4 is a cross-sectional view for explaining the operation of the die-casting device according to the present embodiment shown in FIG. 3. [Diagram 5]FIG. 1 is a diagram showing an example of various modified forms that the present invention can take, in which sub-diagram (a) is a cross-sectional view of a die-casting apparatus relating to the modified form, and sub-diagram (b) is a cross-sectional view showing the line BB cross section in sub-diagram (a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and all of the combinations of features described in the embodiments are not necessarily essential to the solution of the invention.

[0017] A basic form of a die-casting apparatus 1 according to one embodiment of the present invention will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a cross-sectional view showing a state in which a main pressure rod is in a retreated position in the die-casting apparatus according to this embodiment. Fig. 2 is a cross-sectional view showing a state in which a main pressure rod is in an advanced position in the die-casting apparatus according to this embodiment.

[0018] As shown in FIG. 1, the die casting mold 10 includes a fixed mold 20 and a movable mold 30. The fixed mold 20 includes a fixed holder 21 and a fixed die 22, and an injection sleeve 23 (sleeve) is disposed in the fixed holder 21. A plunger tip 25 connected to the tip of a plunger rod 24 is disposed in the injection sleeve 23. By operating an injection cylinder (not shown) to slide the plunger tip 25 in the injection sleeve 23, it is possible to fill a molten metal such as an aluminum alloy supplied from a molten metal supply hole (not shown) of the injection sleeve 23 into a cavity 53 described later. The plunger tip 25, the plunger rod 24, and the injection cylinder (not shown) constitute a first pressurizing means according to the present invention. The plunger rod 24 constitutes a first pressurizing rod according to the present invention.

[0019] The movable mold 30 is composed of a movable holder 31, a movable die 32, and a flow divider 33, and can move in the moving direction of the movable mold 30 indicated by the arrow A←→A' (the mold opening direction of the die casting mold 10). In the mold clamping state shown in FIG. 1 and FIG. 2, a runner 50, a gate 52, and a cavity 53 are defined inside the die casting mold 10, and the space inside the injection sleeve 23 communicates with the cavity 53 via the runner 50 and the gate 52. The runner 50 includes a first runner 50A extending in a direction having a slight inclination angle with respect to the axial direction of the injection sleeve 23 (the mold opening direction of the die casting mold 10), and a second runner 50B extending in a direction substantially perpendicular to the axial direction of the injection sleeve 23. The first runner 50A is defined by the injection sleeve 23 disposed in the fixed mold 20 and the flow divider 33 of the movable mold 30. The second runner 50B has a portion defined by the injection sleeve 23 and the diverter 33, and a portion defined by the fixed die 22 and the movable die 32. In this embodiment, the portion of the second runner 50B defined by the injection sleeve 23 and the diverter 33 is formed as a cylindrical runner having a cylindrical internal space, and the portion of the second runner 50B defined by the fixed die 22 and the movable die 32 is formed as a trapezoidal runner having a trapezoidal internal space. In addition, the gate 52 and the cavity 53 are defined by the fixed die 22 and the movable die 32.

[0020] A hydraulic cylinder 40 is fixed to the diverter 33 via a bracket (not shown). A main pressure rod 43 is connected to a piston rod 41 of the hydraulic cylinder 40 via a coupling 42. The main pressure rod 43 is inserted into a through hole 34 formed in the diverter 33, and a tip portion 43A of the main pressure rod 43 closes an upper opening 34A of the through hole 34. The main pressure rod 43 can be advanced and retreated in a direction substantially perpendicular to the mold opening direction of the die casting die 10 by the operation of the hydraulic cylinder 40. When the hydraulic cylinder 40 is operated, the main pressure rod 43 can advance from a retreated position shown in FIG. 1 into the second runner 50B and can advance to an advanced position shown in FIG. 2. Therefore, in the die casting device 1 according to this embodiment, by advancing the main pressure rod 43 into the second runner 50B, it is possible to pressurize the molten metal in the cavity 53 through the molten metal in the second runner 50B. The hydraulic cylinder 40, the piston rod 41, and the main pressure rod 43 constitute a second pressurizing means according to the present invention. Moreover, the main pressure rod 43 constitutes a second pressure rod according to the present invention.

[0021] The tip 43A of the main pressure rod 43 is shaped like a cylindrical shaft. The second runner 50B has a corresponding shape portion 51 formed in a circular shape so as to correspond to the cross-sectional shape of the tip 43A of the main pressure rod 43, and the circumferential gap between the surface 51A defining the corresponding shape portion 51 and the tip 43A of the main pressure rod 43 is set to, for example, a range of 0.5 to 3.0 mm. If the gap is less than 0.5 mm, the thin wall portion solidified in the gap will be cut off when the die-cast product is removed. If the gap exceeds 3.0 mm, the molten metal in the second runner 50B cannot be sufficiently prevented from flowing back through the gap when the molten metal in the second runner 50B is pressurized by the main pressure rod 43, and a sufficient feeder effect cannot be provided to the molten metal in the cavity 53. If the molten metal in the second runner 50B has good fluidity, backflow is likely to occur through the gap, so when pressurizing the molten metal in the second runner 50B with the main pressure rod 43 before the molten metal is completely filled into the cavity 53, it is preferable to set the gap between the surface 51A defining the corresponding shape portion 51 of the second runner 50B and the tip 43A of the main pressure rod 43 to 3.0 mm or less.

[0022] The basic configuration of the die-casting device 1 according to this embodiment has been described above. Next, the characteristic configuration of the die-casting device 1 according to this embodiment will be described with reference to Figs. 3 and 4. Here, Fig. 3 is a diagram for explaining the characteristic configuration of the die-casting device according to this embodiment, and is a cross-sectional view showing in particular the periphery of the main pressure rod. Also, Fig. 4 is a cross-sectional view for explaining the operation of the die-casting device according to this embodiment shown in Fig. 3.

[0023] The die casting apparatus 1 according to this embodiment is equipped with a third pressurizing means including an auxiliary pressurizing rod 63 for assisting the main pressurizing rod 43 which pressurizes the molten metal in the runner 50. The third pressurizing means of this embodiment is configured to include a hydraulic cylinder (not shown), a piston rod (not shown), and the auxiliary pressurizing rod 63. The auxiliary pressurizing rod 63 is a member that constitutes the third pressurizing rod according to the present invention.

[0024] 3 is a cylindrical shaft-shaped member and is capable of pressurizing the molten metal in the runner 50. The auxiliary pressure rod 63 according to this embodiment is installed on the movable die 32 on the movable mold 30 side that constitutes the die casting die 10. The main pressure rod 43 and the auxiliary pressure rod 63, which pressurize the molten metal in the runner 50, are arranged so as not to interfere with each other when the molten metal in the runner 50 is pressurized.

[0025] Here, in the die casting device 1 according to this embodiment, a boss shape 50C that bulges toward the auxiliary pressure rod 63 is formed at the molten metal pressurizing position of the runner 50 pressurized by the auxiliary pressure rod 63. More specifically, the boss shape 50C is formed in the second runner 50B extending in a direction substantially perpendicular to the axial direction of the injection sleeve 23, and the molten metal that flows into the recessed portion forms the boss shape 50C by forming a recess in the movable die 32 that forms a part of the second runner 50B. The auxiliary pressure rod 63 pressurizes the molten metal from the boss shape 50C formed in the second runner 50B, so that an auxiliary pressure force that supplements the pressure force applied to the molten metal by the main pressure rod 43 can be applied to the molten metal. In this way, by providing the boss shape 50C at the pressurizing position of the molten metal by the auxiliary pressure rod 63, the pressurizing effect on the molten metal present in the second runner 50B can be further enhanced.

[0026] 4 shows the state of the die casting apparatus 1 according to this embodiment immediately before the auxiliary pressure rod 63 starts pressurizing the molten metal. That is, in the die casting apparatus 1 according to this embodiment, the main pressure rod 43 starts pressurizing the molten metal in the runner 50, and the auxiliary pressure rod 63 starts pressurizing when the tip of the main pressure rod 43 closes the lower entrance of the second runner 50B.

[0027] In addition, in the die casting device 1 according to the present embodiment, the operation control is executed so that the pressurizing stroke of the main pressurizing rod 43, which pressurizes the molten metal in the runner 50, is approximately 1.5 times the axial diameter of the main pressurizing rod 43, and the pressurizing stroke of the auxiliary pressurizing rod 63, which pressurizes the molten metal in the runner 50, is approximately half the distance of the main pressurizing rod 43. That is, in a conventional die casting device in which the auxiliary pressurizing rod 63 does not exist, in order to maintain the quality of the die cast product, the pressurizing stroke of the main pressurizing rod 43, which pressurizes the molten metal in the runner 50, needs to be approximately 3.0 times the axial diameter of the main pressurizing rod 43. However, when the pressurizing stroke of the main pressurizing rod 43 is long in this way, there are cases where a problem occurs in which the main pressurizing rod 43 cannot be removed from the die cast product. Therefore, by installing the auxiliary pressurizing rod 63 that assists the pressurizing force of the main pressurizing rod 43 as in the present embodiment, the pressurizing stroke of the main pressurizing rod 43 can be shortened, and it is possible to prevent the problem of the main pressurizing rod 43 being unable to be removed from the die cast product. Furthermore, even if the pressure stroke of the main pressure rod 43 is shortened, the volume of pressure applied to the molten metal forming the die-cast product can be secured as in the prior art by applying pressure from the auxiliary pressure rod 63, so that the die-casting apparatus 1 of this embodiment makes it possible to reliably prevent the occurrence of defects that impede productivity while maintaining the quality of the die-cast product.

[0028] Since it is difficult to realize the two-system operation control by the main pressure rod 43 and the auxiliary pressure rod 63 described with reference to Fig. 4 using a single control means, the die casting apparatus 1 according to this embodiment employs a configuration in which the second pressure means and the third pressure means are each controlled by an individual control means. That is, in this embodiment, the operation control is executed so that the auxiliary pressure rod 63 of the third pressure means starts the pressurizing operation on the molten metal in the runner 50 with a delay after the main pressure rod 43 of the second pressure means starts the pressurizing operation on the molten metal in the runner 50. By executing such operation control by the two-system control means, it is possible to facilitate the control and simplify the control means.

[0029] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the scope described in the above embodiments. Various modifications and improvements can be made to the above embodiments.

[0030] For example, in the above-mentioned embodiment, an example was shown in which the boss shape 50C was provided at the location where the molten metal was pressurized by the auxiliary pressure rod 63, but the boss shape 50C can be omitted. Thus, an example in which the boss shape 50C of the above-mentioned embodiment is omitted is shown in Fig. 5. Here, Fig. 5 is a diagram showing an example of various modified forms that the present invention can take, with the divided part (a) in the figure being a cross-sectional view of a die-casting device relating to the modified form, and the divided part (b) being a cross-sectional view showing the cross section taken along line BB in the divided part (a).

[0031] In the case of the modified embodiment shown in FIG. 5(a), the second runner 50B of the die casting device 2 has a cylindrical runner shape below the line BB, and a trapezoidal runner shape above the line BB. In the case of a runner shape in which the boss shape 50C is omitted, the length of the cylindrical runner shape indicated by the symbol C is preferably about 10 mm or more. The length condition of this cylindrical runner is a necessary condition for obtaining a sealing effect. In addition, it is preferable to apply the conditions shown in FIG. 3 and FIG. 4 for the other conditions. That is, in the die casting device of the present invention, by providing the third pressure rod, which is the auxiliary pressure rod 63, regardless of the presence or absence of the boss shape 50C, it is possible to realize a die casting device that can reliably prevent the occurrence of defects that impede productivity while maintaining the quality of the die cast product compared to the conventional technology.

[0032] It will be apparent from the description of the claims that such modified or improved forms may also be included within the technical scope of the present invention. [Explanation of symbols]

[0033] 1, 2 die casting device, 10 die casting mold, 20 fixed mold, 21 fixed holder, 22 fixed die, 23 injection sleeve (sleeve), 24 plunger rod (first pressure means, first pressure rod), 25 plunger tip (first pressure means), 30 movable mold, 31 movable holder, 32 movable die, 33 diverter, 34 through hole, 34A upper opening, 40 hydraulic cylinder (second pressure means), 41 piston rod (second pressure means), 42 coupling, 43 main pressure rod (second pressure means, second pressure rod), 43A tip, 50 runner, 50A first runner, 50B second runner (runner), 50C boss shape, 51 corresponding shape portion, 51A surface, 52 gate, 53 cavity, 63 auxiliary pressure rod (third pressure means, third pressure rod).

Claims

1. A die casting mold defining a cavity and a runner communicating with the cavity; A first pressurizing means for filling the molten metal into the cavity; A second pressurizing means for pressurizing the molten metal in the runner; Equipped with The second pressure means includes a cylindrical second pressure rod that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die casting mold, a third pressurizing means for assisting the second pressurizing means for pressurizing the molten metal in the runner, the third pressurizing means includes a cylindrical third pressurizing rod for pressurizing the molten metal in the runner, a boss shape that bulges toward the third pressure rod is formed at a molten metal pressurizing position of the runner that is pressurized by the third pressure rod.

2. A die casting mold defining a cavity and a runner communicating with the cavity; A first pressurizing means for filling the molten metal into the cavity; A second pressurizing means for pressurizing the molten metal in the runner; Equipped with The second pressure means includes a cylindrical second pressure rod that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die casting mold, a third pressurizing means for assisting the second pressurizing means for pressurizing the molten metal in the runner, the third pressurizing means includes a cylindrical third pressurizing rod for pressurizing the molten metal in the runner, a pressure stroke of the second pressure rod for pressurizing the molten metal in the runner is a distance of approximately 1.5 times a shaft diameter of the second pressure rod, 13. A die casting apparatus, comprising: a third pressure rod for pressurizing the molten metal in the runner, the third pressure rod having a stroke that is approximately half the stroke of the second pressure rod.

3. A die casting mold defining a cavity and a runner communicating with the cavity; A first pressurizing means for filling the molten metal into the cavity; A second pressurizing means for pressurizing the molten metal in the runner; Equipped with The second pressure means includes a cylindrical second pressure rod that advances and retreats in a direction substantially perpendicular to a mold opening direction of the die casting mold, a third pressurizing means for assisting the second pressurizing means for pressurizing the molten metal in the runner, the third pressurizing means includes a cylindrical third pressurizing rod for pressurizing the molten metal in the runner, a pressure applying means for applying pressure to the molten metal in the runner and a pressure applying means for applying pressure to the molten metal in the runner, the pressure applying means being arranged to apply pressure to the molten metal in the runner and a pressure applying means for applying pressure to the molten metal in the runner.

4. In the die casting apparatus according to any one of claims 1 to 3, The die casting apparatus according to claim 1, wherein the second pressure rod and the third pressure rod are arranged so as not to interfere with each other when pressurizing the molten metal in the runner.

5. The die casting apparatus according to any one of claims 1 to 4, The die casting apparatus, wherein the third pressurizing means is installed on a movable mold side constituting the die casting mold.

6. The die casting apparatus according to any one of claims 1 to 5, The die casting apparatus according to claim 1, wherein the second pressurizing means and the third pressurizing means are each controlled by an individual control means.

7. A die casting method comprising performing die casting using the die casting apparatus according to any one of claims 1 to 6.

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