JP2023125027A - Device for die-casting and die-casting method - Google Patents

Abstract

To prevent defects in a hot-metal pressing part of a die-casting die.SOLUTION: In a device for die-casting 1, a hollow part 64 is formed on a die-casting article 60 by pressurizing rods 43 provided in second pressurizing means 40, 41, 42, 43. A pressure rod advance/retract hole 34 for enabling the advance/retract movement of the pressure rod 43 provided in the second pressurizing means and a cooling hole 35 for cooling a hot-metal pressing part 33 by circulating cooling water are formed inside the hot-metal pressing part (sprue pin) 33, provided in a die-casting die 10. The distance dimension L from the outer surface 33A on the side where a biscuit part 61 is formed in the hot-metal pressing part 33 to the pressure rod advance/retract hole 34 has a length of 2.5 to 6 times as much as the maximum diameter dimension φ of the cooling hole 35.SELECTED DRAWING: Figure 5

Description

The present invention relates to a die-casting device and a die-casting method, and particularly relates to a die-casting device equipped with a pressurizing means for pressurizing a runner of a die-casting mold, and a die-casting method performed using the die-casting device.

Conventionally, a die-casting mold includes a cavity and a runner that communicates with the cavity, a first pressurizing means for filling the molten metal into the cavity, and a second pressurizing means for pressurizing the molten metal in the runner. A die casting device is known in which the second pressure means includes a pressure rod that moves back and forth in a direction substantially perpendicular to the opening direction of the die casting mold (see, for example, Patent Document 1 below). . According to such a die casting device, by pressurizing the molten metal within the runner by the second pressurizing means, it is possible to improve the quality of the die cast product formed within the cavity.

In a die-casting mold used in a die-casting device equipped with a pressurizing rod as typified by Patent Document 1 below, when the molten metal is injected into the cavity by the first pressurizing means, the first The pressure means includes a hot water presser section which is the front side in the direction in which the molten metal is pressurized and where a biscuit section which is a part of the die-cast product is formed.

Japanese Patent Application Publication No. 2011-224650

By the way, a pressurizing rod movement hole is formed inside the presser foot of a die-casting mold used in a conventional die-casting device to allow the pressurizing rod of the second pressurizing means to move forward and backward. The location where the pressurizing rod advance/retreat hole is formed is a location that is greatly affected by heat from the molten metal. Therefore, in the presser part of the conventional die-casting mold, there is a possibility that the pressurizing rod advancing/retracting hole may be deformed, and the runner part of the die-cast product may be deformed or damaged due to this deformation. In other words, there is still room for improvement in the presser foot of the die-casting mold used in conventional die-casting equipment to prevent problems caused by large thermal effects.

The present invention has been made in view of the above-mentioned problems existing in the prior art, and its purpose is to prevent the hot water presser of a die-casting mold from being damaged even when it is affected by large heat from the molten metal. It is an object of the present invention to provide a die casting device that does not cause problems such as deformation and breakage.

The present invention will be explained below. In order to facilitate understanding of the present invention, reference numbers of the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated form.

A die casting device (1) according to the present invention includes a die casting mold (10) defining a cavity (53) and a runner (50) communicating with the cavity (53), and a die casting mold (10) that defines a cavity (53) and a runner (50) communicating with the cavity (53). The second pressurizing means includes a first pressurizing means (24, 25) for filling the molten metal, and a second pressurizing means (40, 41, 42, 43) for pressurizing the molten metal in the runner (50). The pressure means (40, 41, 42, 43) includes a pressure rod (43) that advances and retreats in a direction substantially perpendicular to the mold opening direction of the die-casting mold (10), and the first pressure means After the molten metal is injected into the cavity (53) by (24, 25), the runner is injected by the pressurizing rod (43) included in the second pressurizing means (40, 41, 42, 43). By pressurizing the molten metal in the runner (50), the runner portions (62, 63) of the die-cast product (60) solidified in the runner (50) are A die-casting device (1) in which a hollow part (64) is formed, the die-casting mold (10) is configured to inject molten metal into the cavity (53) by the first pressurizing means (24, 25). A location in front of the direction in which the first pressurizing means (24, 25) pressurizes the molten metal and where a biscuit portion (61) that is a part of the die-cast product (60) is formed when injection is performed. The pressurizing rod (43) included in the second pressurizing means (40, 41, 42, 43) moves forward and backward within the hot water presser (33). A pressurizing rod advancing/retracting hole (34) that enables the pressurizing rod to move forward and backward, and a cooling hole (35) that cools the hot water presser part (33) by circulating cooling water are formed. The distance dimension (L) from the outer surface (33A) on the side where the biscuit part (61) is formed in the part (33) to the pressure rod advance/retreat hole (34) is the maximum diameter of the cooling hole (35). It is characterized by being formed to have a length 2.5 to 6 times the dimension (φ).

Further, in the die casting device (1) according to the present invention, the cooling hole (35) has a substantially U-shape or a substantially U-shape so as to go around at least a part of the periphery of the pressure rod advance/retreat hole (34). It can be formed as a cooling water path.

Furthermore, in the die-casting device (1) according to the present invention, the formation location of the hot water retainer (33) of the die-casting mold (10) is the cavity ( 53) A part where the biscuit part (61) and the runner part (62, 63), which are part of the die-cast product (60), are formed when the molten metal is injected into the die-cast product (60). , the runner part (62, 63) is configured to act as the first pressurizing means (24, 63) when the first pressurizing means (24, 25) injects the molten metal into the cavity (53). 25) includes a first runner portion (62) formed at an inclination angle (θ) with respect to the direction in which the molten metal is pressurized; a second runner part (63) in which a hollow part (64) is formed by advancing the pressure rod (43), and a part of the cooling hole (35) is formed in the first runner part (62). It can be formed with an angle (θ') along the inclination angle (θ).

Furthermore, in the die casting apparatus (1) according to the present invention, when assuming a virtual injection center line (α) in the direction in which the first pressurizing means (24, 25) pressurizes the molten metal, the cooling hole (35) may be formed so as to overlap with the virtual injection center line (α).

Note that the present invention includes a die-casting method characterized in that die-casting is performed using the above-mentioned die-casting device (1).

According to the present invention, it is possible to provide a die casting device that does not cause problems such as deformation or breakage in the presser part of a die casting mold even if the die casting mold receives a large thermal influence from the molten metal.

FIG. 2 is a cross-sectional view showing a state in which the pressure rod is in a retracted position in the die-casting device according to the present embodiment. FIG. 2 is a cross-sectional view showing a state in which the pressurizing rod is in an advanced position in the die-casting device according to the present embodiment. It is an external perspective view showing the shape of a biscuit part, a 1st runner part, and a 2nd runner part which are some die-cast goods manufactured by the apparatus for die-casting concerning this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram for explaining the main part structure of the die-casting apparatus which concerns on this embodiment, and the die-casting product manufactured by the said die-casting apparatus, and the partial view (a) in a figure is a part of die-casting product. It schematically shows the shape of the die-casting mold around the presser foot, where the biscuit part, the first runner part, and the second runner part are molded. ) shows a part of the die-cast product molded by the die-cast mold shown in FIG. It is a figure which shows the detailed shape of the hot water presser part which the die-casting metal mold used with the apparatus for die-casting which concerns on this embodiment has.

Hereinafter, preferred embodiments for carrying out the present invention will be described using the drawings. Note that the following embodiments do not limit the inventions claimed in each claim, and not all combinations of features described in the embodiments are essential to the solution of the invention. .

A die-casting device 1 according to an embodiment of the present invention will be described using FIGS. 1 and 2. Here, FIG. 1 is a cross-sectional view showing a state in which the pressurizing rod is in the retracted position in the die-casting apparatus according to the present embodiment. Moreover, FIG. 2 is a sectional view showing a state in which the pressurizing rod is in the forward position in the die-casting apparatus according to the present embodiment.

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 the fixed holder 21 is provided with an injection sleeve 23 (sleeve). A plunger tip 25 connected to the tip of a plunger rod 24 is disposed within the injection sleeve 23 . By operating an injection cylinder (not shown) and sliding the plunger tip 25 within the injection sleeve 23, molten metal such as aluminum alloy supplied from a hot water supply hole (not shown) of the injection sleeve 23 is introduced into a cavity 53 (described later). Can be filled. The plunger tip 25, the plunger rod 24, and the injection cylinder (not shown) constitute the first pressurizing means according to the present invention.

The movable mold 30 is composed of a movable holder 31, a movable die 32, and a flow divider 33 as a hot water presser according to the present invention, and moves in the direction of movement of the movable mold 30 shown by the arrow A←→A' (the mold of the die-casting mold 10). It can be moved in the opening direction). In the clamped state shown in FIGS. 1 and 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 is opened through the runner 50 and the gate 52. It communicates with the cavity 53. The runner 50 includes a first runner 50A extending in a direction with a slight inclination angle with respect to the axial direction of the injection sleeve 23 (the opening direction of the die-casting mold 10), and a first runner 50A extending in a direction substantially perpendicular to the axial direction of the injection sleeve 23. 2nd runner 50B extending to. The first runner 50A is defined by the injection sleeve 23 disposed on 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 flow splitter 33, and a portion defined by the fixed die 22 and the movable die 32. The gate 52 and the cavity 53 are defined by the fixed die 22 and the movable die 32.

A hydraulic cylinder 40 is fixed to the flow divider 33 as a hot water retainer of the present invention via a bracket (not shown). A pressure rod 43 is connected to a piston rod 41 of the hydraulic cylinder 40 via a coupling 42 . The pressure rod 43 is inserted into a pressure rod retraction hole 34 formed in the flow divider 33, and the tip end 43A of the pressure rod 43 closes the upper opening 34A of the pressure rod retraction hole 34. The pressure rod 43 can be moved back and forth in a direction substantially perpendicular to the mold opening direction of the die-casting mold 10 by operating the hydraulic cylinder 40, and when the hydraulic cylinder 40 is operated, it is in the retreat position shown in FIG. It is possible to enter the second runner 50B and advance to the forward position shown in FIG. 2. Therefore, in the die casting device 1 according to the present embodiment, by advancing the pressure rod 43 into the second runner 50B, it is possible to pressurize the molten metal in the cavity 53 via the molten metal in the second runner 50B. It is. The hydraulic cylinder 40, the piston rod 41, the coupling 42, and the pressurizing rod 43 constitute a second pressurizing means according to the present invention.

Note that the tip end portion 43A of the pressure rod 43 has a cylindrical shape. The second runner 50B includes a corresponding shape part 51 formed in a circular shape to correspond to the cross-sectional shape of the tip end 43A of the pressure rod 43, and the surface 51A defining the corresponding shape part 51 and the The circumferential gap between the pressure rod 43 and the tip 43A is set, for example, in a range of 0.5 to 3.0 mm. If the gap is less than 0.5 mm, the thin portion solidified in the gap will be cut off when the die-cast product is taken out. Furthermore, if the gap exceeds 3.0 mm, it will not be possible to sufficiently prevent the molten metal from flowing back through the gap when the pressure rod 43 pressurizes the molten metal in the second runner 50B, and the inside of the cavity 53 will not be sufficiently prevented. It is not possible to give a sufficient boiling effect to the molten metal. When the fluidity of the molten metal in the second runner 50B is good, backflow is likely to occur from the gap, so the molten metal in the second runner 50B is pressurized with the pressurizing rod 43 before the filling of the molten metal into the cavity 53 is completed. In this case, it is preferable that the gap between the surface 51A defining the corresponding shaped portion 51 of the second runner 50B and the tip end 43A of the pressure rod 43 be 3.0 mm or less.

The basic configuration of the die casting apparatus 1 according to the present embodiment has been described above. Next, the characteristic configuration of the die casting apparatus 1 according to this embodiment will be explained using FIGS. 3 to 5. Here, FIG. 3 is an external perspective view showing the shapes of a biscuit part, a first runner part, and a second runner part, which are part of a die-cast product manufactured by the die-casting apparatus according to the present embodiment. Moreover, FIG. 4 is a schematic diagram for explaining the main part structure of the die-casting apparatus based on this embodiment, and the die-casting product manufactured by the said die-casting apparatus. Note that part view (a) in FIG. 4 shows the area around the separator as the presser part where the biscuit part, the first runner part, and the second runner part, which are part of the die-cast product, are formed. The shape of the die-casting mold is schematically shown, and the partial view (b) in FIG. 4 shows a part of the die-cast product molded by the die-casting mold shown in the partial view (a) in FIG. It shows. Furthermore, FIG. 5 is a diagram showing the detailed shape of a flow divider as a hot water retainer included in a die-casting mold used in the die-casting apparatus according to the present embodiment.

First, with reference to FIG. 3, the shapes of the biscuit part 61, the first runner part 62, and the second runner part 63, which are part of the die-cast product 60 manufactured by the die-casting apparatus 1 according to the present embodiment, will be explained. do.

As is clear from a comparison of FIGS. 2 and 3, the biscuit portion 61 is formed in a region surrounded by the injection sleeve 23, the plunger tip 25, and the flow divider 33. Further, the first runner portion 62 is a portion formed within the first runner 50A. Furthermore, the second runner portion 63 is a portion formed within the second runner 50B.

The second runner 50B is a region that extends in a direction substantially perpendicular to the axial direction of the injection sleeve 23, and the first runner 50A is a region that extends slightly in the axial direction of the injection sleeve 23 (the opening direction of the die-casting mold 10). Since the region extends in a direction having an inclination angle (for example, an angle of about 5° to 15° with respect to the horizontal plane), the second runner portion is formed to extend in a direction substantially perpendicular to the axial direction of the injection sleeve 23. 63, the first runner portion 62 is connected with a slight inclination angle.

Further, as described above, the pressure rod 43 of this embodiment is capable of moving back and forth in a direction substantially perpendicular to the opening direction of the die-casting mold 10 by the operation of the hydraulic cylinder 40. Therefore, when the hydraulic cylinder 40 is operated, the pressurizing rod 43 enters the second runner 50B, so that a hollow portion 64 is formed in the second runner portion 63.

Note that the region surrounded by the injection sleeve 23, the plunger tip 25, and the flow divider 33 where the biscuit part 61 is formed is where the molten metal is injected into the cavity 53 by the first pressurizing means of this embodiment. Since the first pressurizing means is sometimes located in front of the direction in which the molten metal is pressurized, the flow divider 33, which is the presser part of the present invention, is particularly susceptible to a large thermal influence among the constituent parts of the die-casting mold 10. This will be the place where you will be exposed. Therefore, the flow divider 33 of this embodiment has various features as shown in FIGS. 4 and 5.

That is, in the flow divider 33 of this embodiment, as shown in FIGS. 4 and 5, pressure is applied to the interior of the flow divider 33 to enable the pressure rod 43 provided in the second pressure means to move forward and backward. A rod advancing/retracting hole 34 and a cooling hole 35 for cooling the flow divider 33 by circulating cooling water are formed. In particular, as shown in FIG. 5, from the outer surface 33A of the flow divider 33 on the side where the biscuit portion 61 is formed to the inner wall surface of the pressurizing rod advance/retreat hole 34 on the side where the biscuit portion 61 is formed. It is preferable that the distance dimension L is 2.5 to 6.0 times as long as the maximum diameter dimension φ of the cooling hole. In the example of this embodiment shown in FIG. 5, from the outer surface 33A of the flow divider 33 on the side where the biscuit portion 61 is formed to the inner wall surface of the pressurizing rod advance/retreat hole 34 on the side where the biscuit portion 61 is formed. The distance dimension L is 70 mm, and the maximum diameter dimension φ of the cooling hole is 13 mm, and the distance dimension L is formed to have a length 5.4 times the maximum diameter dimension φ. Since the flow divider 33 of this embodiment has the above-mentioned structural features, it is possible to prevent deformation of the pressurizing rod advancing/retracting hole 34 due to thermal effects, etc., and the runner part (first The strength of the runner portion 62, the second runner portion 63), etc. can be ensured. Moreover, by providing such a configuration, a sufficient cooling effect on the flow divider 33 of this embodiment can be ensured, so that a die-casting apparatus 1 with durability can be realized.

In addition, in the flow divider 33 of this embodiment, as shown in FIGS. 4 and 5, the cooling hole 35 formed inside the flow divider 33 is configured to rotate at least part of the periphery of the pressurizing rod advancement/retraction hole 34. When the flow divider 33 is viewed in a direction substantially perpendicular to the opening direction of the die-casting mold 10, it is formed as a substantially U-shaped cooling water path. According to the shape of the cooling hole 35, it is possible to obtain an appropriate cooling effect while maintaining the strength of the flow splitter 33. Therefore, the configuration of the cooling hole 35 can also be applied to a durable die-casting device. This can contribute to the realization of 1.

Note that the shape of the cooling hole of the present invention is not limited to the embodiment shown in FIGS. 4 and 5, and any shape can be adopted. For example, the cooling holes of the present invention formed inside the shunt 33 have a substantially U-shape when the shunt 33 is viewed in a direction substantially perpendicular to the opening direction of the die-casting mold 10. It may also be formed as a cooling water path. Further, the shape of the cooling hole 35 in this embodiment is formed by combining three linear cooling water paths into a substantially U-shape, but the shape of the cooling hole 35 in the present invention is formed by a pressure rod advancement/retraction hole. It is sufficient that the cooling water path is formed so as to go around at least a portion of the periphery of 34, and may be formed to include a spiral cooling water path, for example. Such a shape of the cooling hole can be realized by using a manufacturing technology such as a 3D printer, for example.

Regarding the flow splitter 33 of this embodiment, the formation location of the flow splitter 33 included in the die-casting mold 10 is such that the injection of molten metal into the cavity 53 by the first pressurizing means is difficult, as shown in FIGS. 4 and 5. This is where the biscuit portion 61, which is part of the die-cast product 60, and the first runner part 62 and part of the second runner part 63, which are part of the runner part, are formed when the molding is performed. Of the runner parts of this embodiment, the first runner part 62 is configured so that when the first pressurizing means injects the molten metal into the cavity 53, the first pressurizing means pressurizes the molten metal. Although it is formed with a slight inclination angle θ with respect to the direction, a part of the cooling hole 35 formed inside the flow divider 33 is formed along the inclination angle θ of the first runner portion 62. It is formed to have an angle θ'. In the example of this embodiment shown in FIG. 5, the inclination angle θ of the first runner portion 62 and the angle θ′ of a portion of the cooling hole 35 formed inside the flow splitter 33 are formed at the same angle. Specifically, θ=θ'=15°. That is, in this embodiment, the first runner part 62 and the cooling hole 35 formed at the location where the first runner part 62 is formed are arranged substantially parallel to each other. In this way, by forming the cooling holes 35 of this embodiment at an angle that follows the shape of the formation location of the first runner portion 62 where the shunt 33 is affected by heat, a suitable cooling effect on the shunt 33 can be achieved. Therefore, the configuration of the cooling holes 35 also contributes to the realization of the die casting device 1 with durability.

Regarding the flow divider 33 of this embodiment, as shown in FIG. is formed at a position that overlaps with this virtual injection center line α. In other words, according to the present embodiment shown in FIG. 5, the cooling holes 35 are formed at positions that are most susceptible to heat effects from the molten metal on the outer surface 33A of the flow divider 33 on the side where the biscuit portion 61 is formed. Therefore, a suitable cooling effect for the flow divider 33 can be obtained. The configuration of the cooling holes 35 also contributes to realizing the die casting device 1 with durability.

Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the range described in the above embodiments. Various changes or improvements can be made to the above embodiments.

For example, in the embodiment described above, an example of the configuration is shown in which the hot water presser of the present invention is formed as a flow divider 33 included in the movable mold 30. However, the hot water presser portion of the present invention is not limited to being formed by the member called the flow splitter 33, but may be formed integrally with the movable die 32, or may be formed from other parts, for example. As such, any form can be adopted.

It is clear from the claims that such modifications or improvements may be included within the technical scope of the present invention.

1 die casting device, 10 die casting mold, 20 fixed mold, 21 fixed holder, 22 fixed die, 23 injection sleeve, 24 plunger rod (first pressurizing means), 25 plunger tip (first pressurizing means), 30 movable Mold, 31 Movable holder, 32 Movable die, 33 Divider (hot water presser), 33A Outer surface, 34 Pressure rod advance/retreat hole, 34A Upper opening, 35 Cooling hole, 40 Hydraulic cylinder (second pressurizing means), 41 Piston rod (second pressure means), 42 Coupling (second pressure means), 43 Pressure rod (second pressure means), 43A tip, 50 runner, 50A first runner, 50B second runner, 51 corresponding shape part, 51A surface, 52 gate, 53 cavity, 60 die-cast product, 61 biscuit part, 62 first runner part (runner part), 63 second runner part (runner part), 64 hollow part, L distance dimension, φ maximum diameter dimension, θ inclination angle (of first runner section 62), θ' angle (part of cooling hole 35), α virtual injection center line.

Claims (5)

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 pressurizing means includes a pressurizing rod that moves forward and backward in a direction substantially perpendicular to the opening direction of the die-casting mold, and the first pressurizing means injects the molten metal into the cavity. After the molten metal in the runner is pressurized by the pressurizing rod of the second pressurizing means, the runner portion of the die-cast product solidified in the runner is covered with the pressurizing rod. A die casting device in which a hollow part is formed by advancing,
When the first pressurizing means injects the molten metal into the cavity, the die-casting mold is located in front of the direction in which the first pressurizing means pressurizes the molten metal, and is a part of the die-cast product. Including the hot water presser part where the biscuit part is formed,
Inside the hot water presser,
a pressurizing rod advance/retreat hole provided in the second pressurizing means that allows the pressurizing rod to move forward and backward;
a cooling hole for cooling the hot water presser by circulating cooling water;
is formed,
The distance from the outer surface of the presser foot on the side where the biscuit part is formed to the pressure rod advance/retreat hole is 2.5 to 6 times longer than the maximum diameter of the cooling hole. A die casting device characterized in that it is formed as follows. The die casting device according to claim 1,
A die-casting device, wherein the cooling hole is formed as a cooling water path having a substantially U-shape or a substantially U-shape so as to go around at least a portion of the periphery of the pressurizing rod advance/retreat hole. The die casting device according to claim 1 or 2,
The forming portion of the presser portion of the die-casting mold is formed by forming the biscuit portion and the runner, which are part of the die-cast product, when the first pressurizing means injects the molten metal into the cavity. This is the part where part of the part is molded,
The runner part is
A first runner portion formed at an angle of inclination with respect to a direction in which the first pressurizing means pressurizes the molten metal when the first pressurizing means injects the molten metal into the cavity. and,
a second runner portion in which a hollow portion is formed by advancement of the pressure rod included in the second pressure means;
Equipped with
A die-casting apparatus, wherein a portion of the cooling hole is formed at an angle along an inclination angle of the first runner part. The die casting device according to any one of claims 1 to 3,
Assuming a virtual injection center line in the direction in which the first pressurizing means pressurizes the molten metal,
A die-casting device, wherein a portion of the cooling hole is formed to overlap with the virtual injection center line. A die-casting method, characterized in that die-casting is carried out using the die-casting apparatus according to any one of claims 1 to 4.

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