JP5316792B2 - Die casting mold and core pin - Google Patents

Description

  The present invention relates to a die casting mold and a core pin used in the die casting mold.

  In the die-casting method, the molten metal filled in the cavity is solidified and contracted, and bending stress acts repeatedly on the shaped part of the core pin exposed to the cavity, whereby the base part of the core pin (the shaped part and the mold member) In some cases, a crack may occur in a boundary portion with the insertion portion inserted into the mounting hole. In view of this, a cast pin having a portion (hereinafter referred to as a small-diameter shaft portion) having an outer diameter smaller than the other portion is known in the insertion portion (see, for example, Patent Document 1). Such a cast pin releases the bending stress acting on the shaped part by positively bending the small-diameter shaft part, and as a result, cracks due to fatigue occur at the boundary between the shaped part and the inserted part of the cast pin. It can be prevented from occurring.

  However, in the above-described core pin, when the deflection of the core pin including the small-diameter shaft portion propagates in a wide range in the axial direction, a gap formed between the core pin insertion portion and the die member mounting hole widens. There is a possibility that the molten metal filled in the cavity may enter the mounting hole from the gap. When the infiltrated molten metal solidifies in the space between the cast pin, particularly the small-diameter shaft portion and the mounting hole of the mold member, bending of the cast pin is inhibited, and as a result, bending stress acting on the shaped portion is It may concentrate on the boundary portion with the insertion portion, and a crack due to fatigue may occur at the boundary portion. Therefore, in Patent Document 2, by filling the space between the small-diameter shaft portion and the mounting hole with silicon rubber (elastic member), the molten metal enters the space without hindering the bending of the core pin. Although the technology for preventing this is disclosed, the heat resistance of silicon rubber (elastic member) is not sufficient, so there is a problem in the sealability between the cast pin and the mold member (mounting hole), and the manufacture of the cast pin Cost increases.

Japanese Patent Laid-Open No. 3-5058 JP 2005-329446 A

  Therefore, the present invention has been made in view of the above circumstances, and is a die-casting die that can achieve both a high level of flexibility of the casting pin at the time of casting and securing of the sealing property between the casting pin and the mold member. Another object of the present invention is to provide a cast pin used in the die casting mold.

  In order to solve the above-described problems, a die casting mold of the present invention is a die casting mold having a casting pin that is detachably attached to a mounting hole of a mold member, and the casting pin is a part of the die casting casting mold. A modeling part exposed in the cavity; and an insertion part inserted into the mounting hole, the insertion part being provided on the modeling part side and fitted into the mounting hole; and the fitting And a small-diameter shaft portion having an outer diameter smaller than the outer diameter of the fitting portion, and a low-rigidity portion having low rigidity with respect to the mold member on the outer periphery of the fitting portion The low-rigidity portion is deformed by the behavior of the core pin during casting.

  In order to solve the above-mentioned problem, a cast pin of the present invention is a cast pin including a modeling part exposed in a cavity of a die-casting mold and an insertion part inserted into an attachment hole of a mold member, The insertion portion is provided on the modeling portion side and is fitted in the mounting hole, and the insertion portion is provided continuously with the fitting portion and has an outer diameter smaller than the outer diameter of the fitting portion. A low-rigidity portion having low rigidity relative to the mold member is formed on the outer periphery of the fitting portion, and the low-rigidity portion is deformed by the behavior of the core pin during casting. It is characterized by.

(Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of items (1) to (8) corresponds to each of claims 1-8.

(1) A die-casting mold having a cast pin that is removably attached to a mounting hole of a mold member, wherein the cast pin is exposed in a cavity of the die-casting mold, and inserted into the mounting hole. The insertion portion includes a fitting portion provided on the modeling portion side and fitted in the mounting hole, and an outer portion provided continuously to the fitting portion and smaller than the outer diameter of the fitting portion. A small-diameter shaft portion having a diameter, and a low-rigidity portion having low rigidity with respect to the mold member is formed on the outer periphery of the fitting portion, and the low-rigidity portion is deformed by the behavior of the core pin during casting. Die-casting mold that is characteristic.
In die casting molds, force and thermal stress due to solidification shrinkage of the molten metal filled in the cavity acts on the casting pin, and when multiple casting pins are arranged, the force acting during casting is determined by each casting pin. Therefore, each core pin exhibits a unique behavior during casting. According to the die-casting mold described in this section, when casting is performed a plurality of times, the low-rigidity part is deformed (plastically deformed) according to the behavior of the casting pin during casting, and the low-rigidity part is provided for each casting pin. Each has a unique shape. For example, a cast pin arranged at a position where a force acting at the time of casting is relatively small has a small deformation (plastic deformation) of the low-rigidity portion, and thus high sealing performance is ensured. On the other hand, in the cast pin arranged at a position where the force acting at the time of casting is relatively large, the deformation (plastic deformation) of the low-rigidity part is large, so that the flexibility is given priority over the sealing performance. The low rigidity portion is deformed (plastic deformation). Thus, in the aspect of this section, by performing the casting a plurality of times and deforming (plastic deformation) the low rigidity portion of each core pin into a unique shape, the flexibility of the core pin during casting, A low-rigidity portion having a shape that achieves a high level of sealing performance between the core pin and the mold member is formed. By this low rigidity portion, it is possible to prevent the molten metal that has entered the mounting hole from solidifying in the mounting hole and hindering the bending of the small diameter shaft portion. Furthermore, since no modification on the side of the mold member is necessary, it is possible to implement at low cost and easily.
In the aspect of this section, the low-rigidity portion formed on the outer periphery of the fitting portion of the core pin does not necessarily need to be formed on the entire outer periphery of the fitting portion. It can be formed with a predetermined width in the axial direction. For example, the low-rigidity part can be formed with a predetermined width on the modeling part side of the fitting part that particularly requires sealing performance.

(2) The die-casting die according to (1), wherein the low-rigidity portion of the cast pin is formed by forming a layer made of a different material from the die member on the outer periphery of the fitting portion.
According to the die-casting die described in this section, casting is performed a plurality of times, and the low-rigidity layer (low-rigidity portion) of each casting pin is made into a unique shape according to the behavior of the casting pin during casting. By deforming (plastically deforming), it is possible to achieve both the flexibility of the core pin during casting and the securing of the sealing performance between the core pin and the mold member at a high level.
In the aspect of this section, the low-rigidity layer (low-rigidity part) of the core pin can be made of, for example, a titanium alloy.

(3) The die-casting die according to (1), wherein the low-rigidity portion of the core pin is constituted by a ridge extending in the outer peripheral direction of the fitting portion.
According to the die-casting die described in this section, a ridge (low-rigidity portion) extending in the outer peripheral direction of the fitting portion of each core pin is performed according to the behavior of the core pin at the time of casting after performing casting a plurality of times. By deforming (plastic deformation) into a unique shape, it is possible to achieve both a high level of flexibility of the casting pin during casting and securing of the sealing property between the casting pin and the mold member.
In the aspect of this section, the low-rigidity portion of the cast pin can be configured by arranging ridges having an annularly closed shape in the pin axis direction at a constant interval or an indefinite interval. These ridges can also be formed in a spiral shape on the outer periphery of the fitting portion. In this case, it is more advantageous for the low-rigidity portion to ensure sealing performance when the ridges having a closed shape are arranged in an annular shape.

(4) The die cast die of (1), (2), (3), wherein the dimension in the radial direction of the cast pin is gradually increased from the shaped part side toward the small diameter shaft part side. .
When multiple die-casting pins are arranged in a die-casting mold, the low-rigidity part of each die pin is deformed (plastically deformed) according to the behavior of the die pin during casting. In the low-rigidity part, a unique shape is formed for each cast pin. And it is (1) to make both the flexibility of the cast pin at the time of casting and the securing of the sealing property between the cast pin and the mold member at a high level by the low rigidity portion after deformation (plastic deformation). As explained in. In the die-casting die described in this section, casting is performed by gradually increasing the radial direction dimension (layer thickness or ridge height) of the low-rigidity part from the modeling part side toward the small-diameter shaft part side. The low-rigidity portion is deformed (plastically deformed) by giving priority to either the flexibility or sealing property of the core pin at the time. For example, a cast pin having a relatively small behavior at the time of casting, that is, a cast pin arranged at a position where a force acting at the time of casting is relatively small has a small deformation (plastic deformation) of the low rigidity portion. High sealing performance is ensured. On the other hand, a cast pin having a relatively large behavior during casting, that is, a cast pin arranged at a position where a force acting during casting is relatively large is a low-rigidity portion, particularly a small-diameter shaft of the low-rigidity portion. Since the deformation on the part side (plastic deformation) is large, the low rigidity part is more sealed than the case where the radial dimension of the low rigidity part is constant from the molding part side to the small diameter shaft part side. Also, it is deformed (plastic deformation) into a shape in which flexibility is prioritized.

(5) A cast pin including a modeling part exposed in the cavity of the die-casting mold and an insertion part inserted into the mounting hole of the mold member, and the insertion part is provided on the modeling part side and provided in the mounting hole Including a fitting portion to be fitted, and a small-diameter shaft portion that is continuously provided in the fitting portion and has an outer diameter smaller than the outer diameter of the fitting portion. A cast pin characterized in that a low-rigidity portion having a low rigidity is formed and the low-rigidity portion is deformed by the behavior of the cast pin during casting.
In die casting molds, force and thermal stress due to solidification shrinkage of the molten metal filled in the cavity acts on the casting pin, and when multiple casting pins are arranged, the force acting during casting is determined by each casting pin. Therefore, each core pin exhibits a unique behavior during casting. According to the core pin described in this section, when casting is performed a plurality of times, the low rigidity portion is deformed (plastically deformed) according to the behavior of the core pin during casting, and the low rigidity portion is determined for each core pin. Each has a unique shape. For example, a cast pin arranged at a position where a force acting at the time of casting is relatively small has a small deformation (plastic deformation) of the low-rigidity portion, and thus high sealing performance is ensured. On the other hand, in the cast pin arranged at a position where the force acting at the time of casting is relatively large, the deformation (plastic deformation) of the low-rigidity part is large, so that the flexibility is given priority over the sealing performance. The low rigidity portion is deformed (plastic deformation). Thus, in the aspect of this section, by performing the casting a plurality of times and deforming (plastic deformation) the low rigidity portion of each core pin into a unique shape, the flexibility of the core pin during casting, A low-rigidity portion having a shape that achieves a high level of sealing performance between the core pin and the mold member is formed. By this low rigidity portion, it is possible to prevent the molten metal that has entered the mounting hole from solidifying in the mounting hole and hindering the bending of the small diameter shaft portion. Furthermore, since no modification on the side of the mold member is necessary, it is possible to implement at low cost and easily.
In the aspect of this section, the low-rigidity portion formed on the outer periphery of the fitting portion is not necessarily formed on the entire outer periphery of the fitting portion, and is predetermined in the pin axis direction on the condition that sealing performance can be secured. Can be formed with a width. For example, the low-rigidity part can be formed with a predetermined width on the modeling part side of the fitting part that particularly requires sealing performance.

(6) The cast pin according to (5), wherein the low-rigidity portion is formed by forming a layer made of a different material from the mold member on the outer periphery of the fitting portion.
According to the core pin described in this section, casting is performed a plurality of times, and the low-rigidity layer (low-rigidity portion) of the core pin is deformed into a unique shape according to the behavior of the core pin during casting ( By plastic deformation), it is possible to achieve both high flexibility at the time of casting and securing of the sealing performance between the core pin and the mold member.
In the aspect of this section, the low-rigidity layer (low-rigidity part) can be composed of, for example, a titanium alloy.

(7) The cast pin according to (5), wherein the low-rigidity portion is configured by a ridge extending in the outer peripheral direction of the fitting portion.
According to the core pin described in this section, a ridge (low-rigidity portion) extending in the outer peripheral direction of the fitting portion of the core pin according to the behavior of the core pin at the time of casting after being cast a plurality of times is inherent. By deforming into a shape (plastic deformation), it is possible to achieve both the flexibility of the core pin during casting and the securing of the sealing property between the core pin and the mold member at a high level.
In the aspect of this section, the low-rigidity portion can be configured by arranging ridges with a closed ring shape in the pin axis direction at regular intervals or irregular intervals, and a single ridge is fitted like a male screw. It can also be formed by forming a spiral on the outer periphery of the joint. In this case, it is more advantageous for the low-rigidity portion to ensure sealing performance when the ridges having a closed shape are arranged in an annular shape.

(8) The low-rigidity part is a cored pin according to (5), (6), or (7) whose dimension in the radial direction of the cored pin is gradually increased from the molded part side toward the small-diameter shaft part side.
When multiple die-casting pins are arranged in a die-casting mold, the low-rigidity part of each die pin is deformed (plastically deformed) according to the behavior of the die pin during casting. In the low-rigidity part, a unique shape is formed for each cast pin. And it is (5) to make both the flexibility of the cast pin at the time of casting and the securing of the sealing property between the cast pin and the mold member at a high level by the low rigidity portion after deformation (plastic deformation). As explained in. In the cast pin described in this section, the radial dimension of the cast pin of the low rigidity portion (layer thickness or ridge height) is gradually increased from the modeled portion side toward the small-diameter shaft portion side. The low-rigidity portion is deformed (plastically deformed) with priority given to either flexibility or sealing performance at the time. For example, a cast pin having a relatively small behavior at the time of casting, that is, a cast pin arranged at a position where a force acting at the time of casting is relatively small has a small deformation (plastic deformation) of the low rigidity portion. High sealing performance is ensured. On the other hand, a cast pin having a relatively large behavior during casting, that is, a cast pin arranged at a position where a force acting during casting is relatively large is a low-rigidity portion, particularly a small-diameter shaft of the low-rigidity portion. Since the deformation on the part side (plastic deformation) is large, the low rigidity part is more sealed than the case where the radial dimension of the low rigidity part is constant from the molding part side to the small diameter shaft part side. Also, it is deformed (plastic deformation) into a shape in which flexibility is prioritized.

  ADVANTAGE OF THE INVENTION According to this invention, it is used for the die-casting die and this die-casting die which can be compatible with the flexibility of the casting pin at the time of casting, and ensuring the sealing performance between a casting pin and a mold member at a high level. A cast pin can be provided.

It is the figure which showed the type | mold member and the low-rigidity part in the cross section in order to demonstrate the attachment structure of the cast pin which concerns on this embodiment. It is the A section enlarged view in FIG. It is a figure which shows the shape formed in the low-rigidity part by implementing casting in multiple times in the state shown by FIG. It is another embodiment corresponding to FIG. 2, and shows a case where a low rigidity portion is configured by forming a coating layer on the modeling portion side only with a predetermined width. It is a figure which shows the shape formed in the low rigidity part by implementing casting in multiple times in the state shown by FIG. This is another embodiment corresponding to FIG. 2, and shows a case where a low-rigidity portion is configured by arranging annular ridges at predetermined intervals. It is a figure which shows the case where a low-rigidity part is comprised by arrange | positioning a ridge with a space | interval smaller than FIG. FIG. 4 is a view showing a low-rigidity portion that is another embodiment corresponding to FIG. 2 and is formed by gradually increasing the thickness of the coating layer linearly from the modeling portion side toward the small-diameter shaft portion side. It is a figure which shows the shape formed in the low-rigidity part by implementing casting in multiple times in the state shown by FIG. FIG. 4 is a view showing a low-rigidity portion that is another embodiment corresponding to FIG. 2 and is formed by gradually increasing the thickness of the coating layer in a curved shape from the modeling portion side toward the small-diameter shaft portion side. It is a figure which shows the shape formed in the low-rigidity part by implementing casting in multiple times in the state shown by FIG. FIG. 9 is a view showing a low-rigidity portion formed by gradually increasing the height of an annular ridge from the modeling portion side toward the small-diameter shaft portion side, which is another embodiment corresponding to FIG. 2.

An embodiment of the present invention will be described with reference to the accompanying drawings. In addition, since the basic structure including the fixed mold, the movable mold, and the movable core is the same as that of the conventional die casting mold, the die casting mold of the present embodiment is a portion related to the mounting structure of the core pin 1 here. And a detailed description of the die casting mold will be omitted.
As shown in FIG. 1, the core pin 1 has a base made of stainless steel and is attached to an attachment hole 3 provided in a mold member 2 such as a telescopic die. The cast pin 1 has a modeling portion 5 that is exposed to a cavity 4 formed inside a die-casting mold and forms a hole in a cast product, and an insertion portion 6 that is inserted into the mounting hole 3. The modeling part 5 is formed in a truncated columnar shape, and its root part continues to the insertion part 6 via the R shape 5a.

  The insertion portion 6 is provided on the modeling portion 5 side (the right side in FIG. 1) and is fitted to the mounting hole 3 and is fitted to the mounting hole 3, and is formed in a cylindrical shape and fixed to the mold member 2 by bolts. And a small diameter that is formed in a columnar shape whose outer diameter is smaller than the outer diameter of the fitting portion 7 and whose both ends are connected to the fitting portion 7 and the fixing portion 8 via R shapes 9a and 9b, respectively. And a shaft portion 9. As shown in FIG. 2, the core pin 1 of the present embodiment has a low-rigidity portion that is made of a material having low rigidity relative to the material constituting the mold member 2 on the entire outer periphery of the fitting portion 7. 10 is provided. The low-rigidity portion 10 is constituted by a coating layer having a constant thickness T made of, for example, a titanium alloy, and the mounting hole 3 and the fitting portion 7 are in a state where the core pin 1 is attached to the attachment hole 3. Configured to seal the gap.

Next, the operation of this embodiment will be described.
At the time of casting, force and thermal stress due to solidification shrinkage of the molten metal filled in the cavity 4 act on the core pin 1. Here, when a plurality of core pins 1 are arranged in the cavity 4, the force F acting on the core pins 1 at the time of casting differs for each core pin 1, and as a result, each core pin at the time of casting. 1 indicates a unique behavior for each core pin 1. When casting is performed a plurality of times, each of the core pins 1 is deformed (plastically deformed) according to the behavior thereof, and a unique shape is formed in each of the low rigidity portions 10.

  For example, a cast pin 1 having a relatively small behavior during casting, that is, a cast pin 1 arranged at a position where a force acting during casting is relatively small has a deformation (plastic deformation) of the low-rigidity portion 10. Since it is small, high sealing performance is ensured. On the other hand, the cast pin 1 having a relatively large behavior during casting, that is, the cast pin 1 arranged at a position where the force acting during casting is relatively large is low as shown in FIG. Since the deformation (plastic deformation) on both sides in the axial direction (left-right direction in FIG. 1) of the rigid portion 10 is large, the rigid portion 10 is deformed (plastic deformation) into a shape in which flexibility is given priority over sealing performance. In this case as well, the required sealing performance is ensured by the axially central portion (the portion where deformation is small) of the low-rigidity portion 10.

This embodiment has the following effects.
According to the present embodiment, the cast pin 1 is configured by forming the low-rigidity portion 10 made of a material having low rigidity with respect to the material constituting the mold member 2 on the outer periphery of the fitting portion 7. By deforming (plastic deformation) the low-rigidity portion 10 into a unique shape according to the behavior of the core pin 1 due to the force acting at times, the flexibility of the core pin 1 at the time of casting, Ensuring sealing performance with the mold member 2 can be achieved at a high level.
And since the flexibility of the core pin 1 at the time of casting is ensured, the bending stress which acts on the root part of the modeling part 5 of the core pin 1 is relieved, and the replacement cycle of the core pin 1 can be extended. it can. Further, since modification on the side of the mold member 2 is not necessary, it can be easily performed at low cost.

In addition, embodiment is not limited above, For example, you may comprise as follows.
In this embodiment, the low-rigidity coating layer is formed on the entire outer periphery of the fitting portion 7 to configure the low-rigidity portion 10. However, the low-rigidity portion 10 is not necessarily formed on the entire outer periphery of the fitting portion 7. As shown in FIG. 4, a low-rigidity coating layer is required for the molding part 5 side (the right side in FIG. 4) of the fitting part 7, which particularly requires sealing performance (width that can ensure sealing performance). ) To form the low rigidity portion 10. In this case, the flexibility of the core pin 1 (small-diameter shaft portion 9) is given priority over the case where the low-rigidity portion 10 is formed on the entire outer periphery of the fitting portion 7 (see FIGS. 2 and 3). FIG. 5 shows a shape after deformation (plastic deformation) of the low-rigidity portion 10 of the aspect shown in FIG.
In the present embodiment, the low-rigidity coating layer is formed on the outer periphery of the fitting portion 7 to configure the low-rigidity portion 10, but extends in the outer peripheral direction of the fitting portion 7 as shown in FIGS. 6 and 7. The low-rigidity portion 10 can be configured by providing the annular ridges 11 at regular intervals or indefinite intervals in the axial direction. In this case, casting is performed a plurality of times, and the ridge 11 (low-rigidity portion) is deformed (plastically deformed) into a unique shape according to the behavior of the casting pin at the time of casting. Flexibility and securing of the sealing performance between the core pin 1 and the mold member 2 can be made compatible at a high level. In addition, the ridge 11 (low-rigidity part 10) can be obtained by processing the outer periphery of the fitting part 7 with a lathe. The low-rigidity portion 10 can be formed by forming a single ridge 11 on the outer periphery of the fitting portion 7 like a male screw. Is more advantageous in securing sealing performance.
In this embodiment, the coating layer is formed on the outer periphery of the fitting portion 7 with a constant thickness to form the low-rigidity portion 10. However, as shown in FIG. 8, the coating layer is applied to the outer periphery of the fitting portion 7. The thickness (dimension in the radial direction of the cast pin 1) is formed and gradually increased linearly from the modeling part 5 side (right side in FIG. 8) toward the small diameter shaft part 9 side (left side in FIG. 8). The rigid portion 10 can be configured. In this case, in order to ensure sealing performance, the gap on the modeling portion 5 side of the fitting portion 7 with respect to the mounting hole 3 is set small, and the outer periphery of the fitting portion 7 is tapered toward the small diameter shaft portion 9 side. Is done. When casting is performed a plurality of times, the low-rigidity portion 10 is deformed (plastically deformed) according to the behavior of the core pin 1 and is formed into a unique shape as shown in FIG. 9, for example. Thus, when the low-rigidity portion 10 is deformed (plastically deformed) so that the gap between the mounting hole 3 and the low-rigidity portion 10 gradually increases toward the small-diameter shaft portion 9, flexibility is given priority.
Further, as shown in FIG. 10, the coating layer is formed on the outer periphery of the fitting portion 7 with a thickness (dimension in the radial direction of the casting pin 1) from the modeling portion 5 side (right side in FIG. 10) to the small diameter shaft portion 9 side ( The low-rigidity portion 10 can be formed by gradually increasing in a curved shape toward the left side in FIG. In this case, the low-rigidity portion 10 is deformed (plastically deformed), for example, as shown in FIG. 11 according to the behavior of the core pin 1.
Further, as shown in FIG. 12, the annular ridge 11 extending in the outer peripheral direction of the fitting portion 7 has a height (dimension in the radial direction of the casting pin 1) from the modeling portion 5 side (right side in FIG. 12). The low-rigidity portion 10 can be configured by providing at regular intervals or irregular intervals so as to gradually increase toward the small-diameter shaft portion 9 side (left side in FIG. 12). Similarly, the low-rigidity portion 10 is provided by providing the amount of one line extending in a spiral manner so that the height (dimension in the radial direction of the casting pin 1) gradually increases from the modeling portion 5 side toward the small-diameter shaft portion 9 side. Can be configured. Also in this case, in order to ensure the sealing property, the gap on the modeling portion 5 side of the fitting portion 7 with respect to the mounting hole 3 is set small, and the outer periphery of the fitting portion 7 is tapered toward the small diameter shaft portion 9 side. It is formed.

DESCRIPTION OF SYMBOLS 1 Casting pin, 2 type | mold member, 3 mounting hole, 4 cavity, 5 modeling part, 6 insertion part, 7 fitting part, 8 fixed part, 9 small diameter shaft part, 10 low-rigidity part, 11 ridge

Claims (8)

A die-casting mold having a cast pin that is detachably attached to the mounting hole of the mold member,
The core pin includes a modeling part exposed in the cavity of the die casting mold and an insertion part inserted into the mounting hole, and the insertion part is provided on the modeling part side and fits into the mounting hole. A fitting portion to be joined, and a small-diameter shaft portion that is continuously provided in the fitting portion and has an outer diameter smaller than the outer diameter of the fitting portion. A low-rigidity portion having low rigidity relative to the mold member is formed,
A die casting mold, wherein the low-rigidity portion is deformed by the behavior of the core pin during casting. The die-casting mold according to claim 1, wherein the low-rigidity part is configured by forming a layer made of a material different from that of the mold member on an outer periphery of the fitting part. The die-casting mold according to claim 1, wherein the low-rigidity part is configured by a ridge extending in an outer peripheral direction of the fitting part. The die-casting die according to any one of claims 1 to 3, wherein the low-rigidity portion has a dimension in the radial direction of the core pin gradually increased from the modeling portion side toward the small-diameter shaft portion side. . A die-casting pin including a modeling part exposed in a cavity of a die-casting mold and an insertion part inserted into an attachment hole of a mold member,
The insertion portion is provided on the modeling portion side and has a fitting portion that is fitted into the mounting hole, and an outer diameter that is provided continuously with the fitting portion and is smaller than the outer diameter of the fitting portion. A low-rigidity portion having low rigidity with respect to the mold member is formed on the outer periphery of the fitting portion, and the low-rigidity portion is deformed by the behavior of the core pin during casting. Cast pin characterized by that. The cast pin according to claim 5, wherein the low-rigidity portion is configured by forming a layer made of a material different from that of the mold member on an outer periphery of the fitting portion. The cast pin according to claim 5, wherein the low-rigidity portion is configured by a ridge extending in an outer peripheral direction of the fitting portion. The die casting mold according to any one of claims 5 to 7, wherein the low-rigidity portion is gradually increased in dimension in the radial direction of the core pin from the modeling portion side toward the small-diameter shaft portion side. .

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