Die-casting molds

Abstract

To easily mold a molded article having a plurality of pins for heat radiation, without using a dedicated component for degassing.SOLUTION: A die-casting die 10 comprises a first nesting 50 positioned at a fixed die 20 side and a second nesting 70 arranged to be detachably attached to the first nesting 50 and positioned at a movable die 30 side. The first nesting 50 has a first through-hole 56 which is filled with molten metal materials to mold a plurality of pins 105 for heat radiation. The second nesting 70 has a second through-hole 76 through which gas in a molding space 15 is ejected. A concave groove 80, which communicates with the first through-hole 56 and the second through-hole 76 and through which the molten metal materials cannot pass but gas can pass when the second nesting 70 is mounted on the first nesting 50, is formed on a first opposing surface 53 or on a second opposing surface 73. When viewed in a die moving direction P, the plurality of first through-holes 56 do not overlap with at least portions of the plurality of second through-holes 76.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a die casting mold. [Background technology]

[0002] Heat sinks with multiple heat sink pins have been used in various fields. Heat sinks are formed, for example, using a die-casting mold. For example, Patent Document 1 discloses a die-casting mold that includes a movable mold with a nesting mold and a fixed mold. In Patent Document 1, porous members that do not allow molten aluminum material to pass through but allow gas to pass through are disposed in the multiple heat sink pin portions of the cavity for the heat sink. This allows molten aluminum material to easily flow to the tips of each heat sink pin portion, making it possible to manufacture the heat sink. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3306376 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the technology described in Patent Document 1 requires a porous member, which is a dedicated part for venting gas, to form the heat dissipation pins. Furthermore, since one porous member is required to form one heat dissipation pin, the more heat dissipation pins a heat dissipation plate has, the more porous members are required to form the heat dissipation pins, which could increase the cost of manufacturing the heat dissipation plate.

[0005] The present invention has been made in consideration of these points, and its object is to provide a die-casting mold that can easily mold a molded product having multiple heat-dissipating pins without using a dedicated part for venting gas. [Means for solving the problem]

[0006] The die-casting mold according to the present invention is a die-casting mold for molding a molded product having a plurality of heat-dissipating pins, and comprises a fixed mold, a movable mold that can move toward or away from the fixed mold, a nest that molds the plurality of heat-dissipating pins, and a molding space that is partitioned by the fixed mold, the movable mold, and the nest and is filled with molten metal material, and when the direction in which the movable mold moves relative to the fixed mold is defined as a mold movement direction, the nests have a first nesting member located on the fixed mold side in the mold movement direction, and a second nesting member that is detachably provided on the first nesting member and is located on the movable mold side in the mold movement direction, and the first nesting member has a first main body portion having a first opposing surface that faces the second nesting member, and a front end portion that extends in the mold movement direction and has a the second nesting piece has a second body portion having a second opposing surface opposite the first opposing surface, and a plurality of second through holes extending in the mold movement direction, formed through the second body portion, and discharging gas from the molding space; the first opposing surface or the second opposing surface has a recessed groove formed therein that communicates with the first through holes and the second through holes when the second nesting piece is attached to the first nesting piece, and through which the molten metal material cannot pass but gas can pass; and when viewed from the mold movement direction, the plurality of first through holes do not overlap with at least a portion of the plurality of second through holes.

[0007] In the die-casting mold according to the present invention, the first or second opposing surface is formed with a groove that communicates with the first through-hole and the second through-hole when the second insert is attached to the first insert. The groove is configured so that molten metal material cannot pass through but gas can pass through. Furthermore, when viewed from the direction of mold movement, the first through-holes do not overlap with at least a portion of the second through-holes. Therefore, even if the molten metal material is filled into the first through-hole, the molten metal material does not flow into the second through-hole in the areas where the first through-holes and the second through-holes do not overlap. Furthermore, gas in the molding space flows through the first through-hole and the groove to the second through-hole. Therefore, when the molten metal material is filled into the first through-hole, the gas in the first through-hole can flow into the second through-hole via the groove. This allows the molten metal material to be filled all the way to the tip of the first through-hole. In this way, in the area where the first through hole and the second through hole do not overlap, a molded product having a heat dissipation pin can be easily molded without providing a porous member, which is a dedicated part for venting gas, in the first through hole. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a die-casting mold that can easily mold a molded product having a plurality of heat-dissipating pins without using a dedicated part for venting gas. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of a die-casting die according to one embodiment. [Figure 2] FIG. 2 is a perspective view of a molded product formed by a die-casting mold according to one embodiment. [Figure 3] FIG. 3 is a cross-sectional view of a portion of a die-casting die according to one embodiment. [Figure 4] FIG. 4 is a perspective view of a nest according to one embodiment. [Figure 5] FIG. 5 is a perspective view of a first insert according to one embodiment. [Figure 6] FIG. 6 is a plan view of a first insert according to one embodiment. [Figure 7] FIG. 7 is a perspective view of a first insert according to one embodiment. [Figure 8] FIG. 8 is a bottom view of the first nest according to one embodiment. [Figure 9] FIG. 9 is a perspective view of a second insert according to one embodiment. [Figure 10] FIG. 10 is a plan view of a second insert according to one embodiment. [Figure 11] FIG. 11 is a perspective view of a second insert according to one embodiment. [Figure 12] FIG. 12 is a bottom view of the second nest according to one embodiment. [Figure 13] FIG. 13 is a plan view of a second insert according to one embodiment, showing the positional relationship between the first through-hole, the second through-hole, and the recessed groove. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of a die-casting die according to the present invention will be described with reference to the drawings. It should be noted that the embodiment described here is not intended to limit the present invention in any particular way. Furthermore, the same reference numerals are used for members and parts that perform the same functions, and duplicated descriptions will be omitted or simplified as appropriate.

[0011] FIG. 1 is a perspective view of a die-casting mold 10 according to this embodiment. The die-casting mold 10 is a device that uses a die-casting method, i.e., a casting method at high speed and high pressure. Here, high pressure is, for example, 20 MPa to 100 MPa. The die-casting mold 10 is a device that molds a molded product 100 (see FIG. 2) having a plurality of heat-dissipating pins 105 (see FIG. 2). The die-casting mold 10 includes a fixed mold 20, a movable mold 30, and a mold insert 40 (see FIG. 3).

[0012] 2, the molded product 100 is molded from a metal with high thermal conductivity (e.g., an aluminum alloy). The molded product 100 has a box-shaped main body 102 with an open top and a plurality of heat dissipation pins 105 provided inside the main body 102. The main body 102 and the heat dissipation pins 105 are molded integrally. The molded product 100 can be used, for example, as a heat sink or the like.

[0013] As shown in FIG. 3, the fixed mold 20 has a cavity portion 21 used to mold a part of the molded product 100 (see FIG. 2).

[0014] As shown in Fig. 3, the movable die 30 is provided so as to be able to approach or move away from the fixed die 20. Here, the direction in which the movable die 30 moves relative to the fixed die 20 is referred to as the die movement direction P, the direction in which the movable die 30 approaches the fixed die 20 is referred to as P1, and the direction in which the movable die 30 moves away from the fixed die 20 is referred to as P2. The movable die 30 has a core portion 31 used to mold another part of the molded product 100 (see Fig. 2). The movable die 30 has an attachment hole 32 into which a insert 40 is attached.

[0015] As shown in FIG. 3, the insert 40 is disposed within the fixed mold 20 and the movable mold 30. The insert 40 is detachably mounted in the mounting hole 32 of the movable mold 30. The insert 40 forms a plurality of heat dissipation pins 105 (see FIG. 2) in the molded product 100 (see FIG. 2). The insert 40 forms a portion of the main body 102 (see FIG. 2) of the molded product 100. The insert 40 is used to form the plurality of heat dissipation pins 105 and a portion of the main body 102. When the movable mold 30 is moved in direction P1 (bringing the movable mold 30 closer to the fixed mold 20) with the insert 40 attached to the mounting hole 32 to close the die-casting mold 10, a molding space 15 is formed by the fixed mold 20, the movable mold 30, and the insert 40. The molding space 15 is defined by the cavity portion 21, the core portion 31, and a first through-hole 56 (described later) in the insert 40. Molten metal material (molten metal) is filled into the molding space 15. The metal material may be, for example, an aluminum alloy. The molten metal material is filled into the molding space 15 through an injection port 12 (see FIG. 1) provided in the fixed mold 20.

[0016] As shown in Figures 3 and 4, the insert 40 has a first insert 50 and a second insert 70. The first insert 50 is located on the fixed mold 20 side in the mold movement direction P. When the insert 40 is attached to the attachment hole 32, the first insert 50 is housed in the cavity portion 21. The second insert 70 is located on the movable mold 30 side in the mold movement direction P. The second insert 70 is provided detachably to the first insert 50. When the insert 40 is attached to the attachment hole 32, the second insert 70 is housed in the attachment hole 32.

[0017] As shown in Figures 5 and 7, the first nesting member 50 has a first main body portion 52, a plurality of first through holes 56 formed through the first main body portion 52, and an engaging protrusion 60 protruding from the first main body portion 52.

[0018] 7 and 8, the first main body portion 52 has a first opposing surface 53 that faces the second insert 70 (more specifically, a second opposing surface 73, which will be described later). As shown in FIGS. 5 and 6, the first main body portion 52 has a surface 54 that is located on the opposite side of the first opposing surface 53 in the mold movement direction P. When the insert 40 is attached to the attachment hole 32, the surface 54 is located on the fixed mold 20 side, and the first opposing surface 53 is located on the movable mold 30 side.

[0019] 5 and 6, the first through holes 56 extend in the mold movement direction P. The first through holes 56 penetrate the first main body portion 52 from the front surface 54 to the first opposing surface 53. The first through holes 56 are filled with molten metal material to form a plurality of heat dissipation pins 105 (see FIG. 2). In other words, the first through holes 56 are used to form the heat dissipation pins 105.

[0020] 7 and 8, the first nesting member 50 has four engagement protrusions 60. The engagement protrusions 60 are provided at the four corners of the first main body portion 52. The engagement protrusions 60 protrude from the first main body portion 52 in direction P2. The engagement protrusions 60 are configured to engage with engagement recesses 90 (described later) of the second nesting member 70 (see FIG. 9).

[0021] As shown in Figures 9 and 11, the second nesting member 70 has a second main body portion 72, a plurality of second through holes 76 formed through the second main body portion 72, and an engagement recess 90 formed in the second main body portion 72.

[0022] 9 and 10, the second main body portion 72 has a second opposing surface 73 that faces the first insert 50 (more specifically, the first opposing surface 53). As shown in FIGS. 11 and 12, the second main body portion 72 has a back surface 74 that is located on the opposite side of the second opposing surface 73 in the mold movement direction P. When the insert 40 is attached to the attachment hole 32, the second opposing surface 73 is located on the fixed mold 20 side, and the back surface 74 is located on the movable mold 30 side. When the second insert 70 is attached to the first insert 50, the second opposing surface 73 and the first opposing surface 53 come into contact with each other.

[0023] As shown in FIGS. 9 and 10 , the second through holes 76 extend in the mold movement direction P. The second through holes 76 penetrate the second main body portion 72 from the second opposing surface 73 to the back surface 74. The second through holes 76 exhaust gas from the molding space 15 (see FIG. 3 ). That is, the second through holes 76 are used to exhaust gas from the first through holes 56 in the molding space 15 when the molten metal material is filled into the first through holes 56. In this embodiment, another member (not shown) is disposed on the back surface 74, and the second through holes 76 are blocked; however, the second through holes 76 may be open to the atmosphere. The number of second through holes 76 formed through the second main body portion 72 is smaller than the number of first through holes 56 formed through the first main body portion 52. As shown in FIG. 13 , the multiple first through holes 56 and the multiple second through holes 76 do not overlap when viewed from the mold movement direction P. Here, none of the first through holes 56 and none of the second through holes 76 overlap when viewed from the mold movement direction P. In Fig. 13, the first through holes 56 are represented by two-dot chain lines, and the second through holes 76 are represented by solid lines.

[0024] 11 and 12, the second nesting member 70 has four engagement recesses 90. The engagement recesses 90 are provided at the four corners of the second main body portion 72. The engagement recesses 90 are recessed from the second opposing surface 73 toward the back surface 74. The engagement recesses 90 are recessed in direction P2. The engagement protrusions 60 (see FIG. 7) engage with the engagement recesses 90, thereby assembling the first nesting member 50 and the second nesting member 70 to each other.

[0025] As shown in FIGS. 9 and 10 , the second insert 70 has a plurality of grooves 80. The grooves 80 are formed in the second opposing surface 73. The grooves 80 are recessed from the second opposing surface 73 toward the back surface 74. The grooves 80 are recessed in the direction P2. The depth of the grooves 80 is, for example, 10 μm to 50 μm (e.g., 30 μm). The grooves 80 extend in the longitudinal direction of the second main body portion 72, i.e., in a direction perpendicular to the direction in which the first through holes 56 and the second through holes 76 extend. The grooves 80 may also extend in the lateral direction of the second main body portion 72. The second through holes 76 are formed in the grooves 80. That is, as shown in FIG. 10 , the second through holes 76 and the grooves 80 overlap when viewed from the mold movement direction P. The grooves 80 communicate with the second through holes 76. The grooves 80 communicate with the first through holes 56 when the second nesting piece 70 is attached to the first nesting piece 50. As shown in FIG. 13 , the first through holes 56 and the grooves 80 overlap when viewed from the mold movement direction P. In one groove 80, the number of second through holes 76 communicating with the groove 80 is fewer than the number of first through holes 56 communicating with the groove 80. For example, the number of second through holes 76 communicating with the groove 80A is two, and the number of first through holes 56 communicating with the groove 80A is six. The grooves 80 are formed so that molten metal material cannot pass through them but gas can pass through them when the second nesting piece 70 is attached to the first nesting piece 50. That is, when the second nesting piece 70 is attached to the first nesting piece 50 and the first through-hole 56 is filled with molten metal material, the gas in the first through-hole 56 flows through the groove 80 to the second through-hole 76, but the molten metal material does not pass through the groove 80 and is blocked by the groove 80.

[0026] As shown in FIGS. 11 and 12 , the second main body portion 72 of the second insert block 70 has a plurality of insertion holes 82 recessed from the back surface 74 toward the second opposing surface 73. The insertion holes 82 are open to the atmosphere. The insertion holes 82 are recessed in the direction P1. The number of insertion holes 82 is smaller than the number of second through holes 76. As shown in FIG. 3 , a pipe 95 through which cooling water flows is inserted into the insertion holes 82. When the pipe 95 is inserted into the insertion hole 82, a gap through which gas can pass is formed between the insertion hole 82 and the pipe 95. A sealing member 97 such as an O-ring is provided between the pipe 95 and the insertion hole 82, so that the water flowing through the pipe 95 does not leak out of the insertion hole 82. The inner diameter of the insertion hole 82 is larger than the inner diameter of the second through hole 76.

[0027] As shown in FIGS. 11 and 12 , the second main body portion 72 of the second insert 70 has a plurality of connecting grooves 84 formed in the back surface 74. The connecting grooves 84 are recessed from the back surface 74 toward the second opposing surface 73. The connecting grooves 84 are recessed in the direction P1. The connecting grooves 84 are grooves that connect the second through holes 76 and the insertion holes 82. The connecting grooves 84 are grooves that allow gas flowing through the second through holes 76 to flow into the insertion holes 82. The connecting grooves 84 extend in the longitudinal direction of the second main body portion 72. The connecting grooves 84 may also extend in the lateral direction of the second main body portion 72. A single insertion hole 82 is connected to a plurality of second through holes 76 via at least one connecting groove 84. For example, four second through holes 76 are connected to the insertion hole 82A via two connecting grooves 84.

[0028] As described above, according to the die-casting mold 10 of this embodiment, the first opposing surface 53 or the second opposing surface 73 has formed therein a groove 80 that communicates with the first through hole 56 and the second through hole 76 when the second insert block 70 is attached to the first insert block 50. Here, the groove 80 is configured so that the molten metal material cannot pass through but the gas can pass through, and the multiple first through holes 56 do not overlap with at least a portion of the multiple second through holes 76 when viewed from the mold movement direction P. Therefore, even if the molten metal material is filled into the first through hole 56 in the portion where the first through hole 56 and the second through hole 76 do not overlap, the molten metal material will not flow into the second through holes 76. Furthermore, because the gas in the molding space 15 flows through the first through holes 56 and the recessed grooves 80 to the second through holes 76, when the molten metal material is filled into the first through holes 56, the gas in the first through holes 56 can flow into the second through holes 76 via the recessed grooves 80. This allows the molten metal material to be filled up to the tip of the first through holes 56 (the end on the second insert 70 side). In this way, the molded product 100 having the heat dissipation pins 105 can be easily molded in the areas where the first through holes 56 and the second through holes 76 do not overlap, even without providing a porous member, which is a dedicated part for venting, in the first through holes 56.

[0029] In the die-casting die 10 of this embodiment, the multiple first through holes 56 and the multiple second through holes 76 do not overlap when viewed from the die movement direction P. According to the above aspect, since the molten metal material does not flow into all of the second through holes 76, it is not necessary to provide porous members, which are dedicated parts for venting gas, in all of the first through holes 56 when forming the heat dissipation pins 105.

[0030] In the die-casting mold 10 of this embodiment, the number of second through holes 76 communicating with one groove 80 is smaller than the number of first through holes 56 communicating with the groove 80. According to the above aspect, there is no need to provide a second through hole 76 for each first through hole 56. In other words, the gas flowing through the multiple first through holes 56 can be collected once in the groove 80, and then the gas can be made to flow through the fewer second through holes 76, thereby further simplifying the structure of the second insert 70 and reducing costs.

[0031] In the die-casting die 10 of this embodiment, the recessed grooves 80 are formed in the second opposing surface 73. According to the above aspect, it is possible to easily form the first through holes 56 in the first insert 50, through which the heat dissipation pins 105 are molded.

[0032] In the die-casting die 10 of this embodiment, the second main body portion 72 includes a back surface 74 located on the opposite side to the second opposing surface 73 in the die movement direction P, an insertion hole 82 recessed from the back surface 74 toward the second opposing surface 73 and into which a pipe 95 through which cooling water flows is inserted, and a connecting groove 84 formed in the back surface 74 and connecting the second through hole 76 and the insertion hole 82. According to the above aspect, gas flowing through the second through hole 76 can be discharged to the outside from the insertion hole 82 (more specifically, the gap between the insertion hole 82 and the pipe 95).

[0033] In the die-casting die 10 of this embodiment, one insertion hole 82 is connected to multiple second through holes 76 via at least one connecting groove 84. According to the above aspect, gas flowing through multiple second through holes 76 can be collected into one insertion hole 82 and then discharged to the outside through the insertion hole 82. In other words, there is no need to create many insertion holes 82, which simplifies the structure of the second insert 70.

[0034] In the die-casting die 10 of this embodiment, the inner diameter of the insertion hole 82 is larger than the inner diameter of the second through hole 76. According to the above aspect, the gas flowing through the second through hole 76 can be more reliably discharged to the outside from the insertion hole 82.

[0035] Although the preferred embodiments of the present invention have been described above, the above-described embodiments are merely examples, and the present invention can be embodied in various other forms.

[0036] In the above-described embodiment, the multiple first through holes 56 and the multiple second through holes 76 are arranged so as not to overlap with each other as viewed from the mold movement direction P, but this is not limited to this. For example, the multiple first through holes 56 may be arranged so as not to overlap with at least a portion of the multiple second through holes 76 as viewed from the mold movement direction P. In other words, a portion of the multiple first through holes 56 may overlap a portion of the multiple second through holes 76 as viewed from the mold movement direction P.

[0037] In the above-described embodiment, the recessed groove 80 is formed in the second opposing surface 73 of the second insert 70, but this is not limiting. The recessed groove 80 may be formed in the first opposing surface 53 of the first insert 50, for example. [Explanation of symbols]

[0038] 10 Die-casting molds 15 Molding space 20 Fixed type 30 Movable type 40 nesting 50 First Nest 52 First main body part 53 First opposing surface 56 First through hole 70 Second nesting 72 Second main body part 73 Second opposing surface 74 Back side 76 Second through hole 80 groove 82 Insertion hole 84 Connecting groove 100 Molded products 105 Heat dissipation pin

Claims

1. A die-casting mold for molding a molded product having a plurality of heat dissipation pins, Fixed type and a movable mold that can approach or move away from the fixed mold; a mold for forming the plurality of heat dissipation pins; a molding space defined by the fixed mold, the movable mold, and the insert, and filled with a molten metal material; When the direction in which the movable mold moves relative to the fixed mold is defined as the mold movement direction, The nesting may be: a first insert positioned on the fixed mold side in the mold movement direction; a second insert that is detachably provided on the first insert and is located on the movable mold side in the mold movement direction, The first nesting element is a first main body portion having a first opposing surface that faces the second insert; a plurality of first through holes extending in the mold movement direction, penetrating the first body portion, and being filled with the molten metal material to form the plurality of heat dissipation pins, respectively; The second nesting member is a second main body portion having a second opposing surface opposing the first opposing surface; a plurality of second through holes extending in the mold movement direction, penetrating the second body portion, and discharging gas from within the molding space; a recessed groove is formed in the first opposing surface or the second opposing surface, the recessed groove communicating with the first through-hole and the second through-hole when the second nesting block is attached to the first nesting block, and through which the molten metal material cannot pass but gas can pass; A die-casting mold, wherein the plurality of first through holes do not overlap with at least a portion of the plurality of second through holes when viewed from the mold movement direction.

2. The die casting die according to claim 1 , wherein the first through holes and the second through holes do not overlap each other when viewed from the die movement direction.

3. The die casting mold according to claim 1 or 2, wherein, for each groove, the number of the second through holes communicating with the groove is smaller than the number of the first through holes communicating with the groove.

4. The die casting mold according to claim 1 or 2, wherein the recessed groove is formed in the second opposing surface.

5. The second main body portion is a back surface located on the opposite side of the second opposing surface in the mold movement direction; an insertion hole recessed from the back surface toward the second opposing surface and into which a pipe through which cooling water flows is inserted; The die casting mold according to claim 1 or 2, further comprising: a connecting groove formed on the rear surface and connecting the second through hole and the insertion hole.

6. The die casting mold according to claim 5 , wherein a plurality of the second through holes are connected to one of the insertion holes via at least one of the connection grooves.

7. The die casting mold according to claim 6 , wherein an inner diameter of the insertion hole is larger than an inner diameter of the second through hole.

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