JP2019181503A - Die casting mold, die cast product produced by die casting mold, and method for producing die cast product - Google Patents

Abstract

To provide a die casting mold 1 capable of avoiding misrun and fixation residual even upon producing a product 24 having a shape with a high aspect ratio in a direction vertical to a mold parting plane 5 in which a stationary mold 3 and a movable mold 4 are combined or a product 24 having a complicated shape.SOLUTION: A die casting mold 1 comprises: a stationary mold 3; a movable mold 4 combined to the stationary mold 3 upon casting; a core insertion part 31 formed into a prescribed shape at the surface of the movable mold 4 confronted with the stationary mold 3 when the movable mold 4 is combined into the stationary mold 3; a slide core 10 which can be removed and inserted from/into the core insertion part 31; a runner part 12 formed at the movable mold 4 so as to extend between a biscuit part 11 and the inserted slide core 10; and a gate part 13 formed by a gap 18 between a gate formation face 16 in the movable mold 4 and an upper face 17 of the inserted slide core 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a die-casting die using a slide core, a die-cast product manufactured with the die-casting die, and a method for manufacturing the die-cast product.

  In recent years, Si / SiC power semiconductor modules, LED lighting, and the like are rapidly spreading. For example, in Si / SiC power semiconductor modules, an increase in heat generation due to high output shortens the product life of the module, leading to an increase in failure rate. Accordingly, in order to improve the heat dissipation effect, the heat sink attached to the module or the like needs to reduce the size of the heat sink and increase the surface area of the fin by reducing the fin pitch. In addition, for LED lighting, there is one in which a heat sink is arranged on the outer periphery of the housing, but it has a cylindrical shape, a thin fin, and a complicated shape. Furthermore, heat sinks for LED headlights require complex shapes and high dimensional accuracy due to restrictions on mounting locations. Currently, such a heat sink is often manufactured by an extrusion method using an aluminum alloy having high thermal conductivity.

  On the other hand, it is a mold that combines a fixed mold and a movable mold, in which molten metal (hereinafter referred to as molten metal) is injected from the biscuits, injected through the runner into the product, and die cast. There are known die casting molds and die casting product manufacturing methods (for example, Patent Document 1 and Patent Document 2). The die casting method is capable of manufacturing thin-walled products with high dimensional accuracy and is suitable for mass production, so application to the production of the heat sink is expected, for example.

  In the die-casting die of Patent Document 1, a fin portion whose thickness is reduced as it approaches the product portion is provided between the runner portion and the product portion. By providing a thick area on the side of the fin, the molten metal will not be concentrated in the central part of the fin facing the biscuits along the flow direction of the molten metal, and will be distributed moderately between the central part of the fin and the side of the fin. And will begin to flow. As a result, the molten metal flow is substantially uniform between the product center and the product side.

  In the die casting mold of Patent Document 2, in addition to the main runner and the main gate that guide the molten metal from the biscuit portion to the product portion, a sub runner and a sub gate that inject the molten metal from the side to the product portion are provided. . This prevents the molten metal from being filled to every corner of the product portion and causing insufficient filling.

  In the case of a product with a complicated shape that cannot be molded only with a fixed mold and a movable mold, it can be moved between the fixed mold and the movable mold, and the fixed mold and the movable mold can be closed when the fixed mold and the movable mold are combined. For example, a core having a protrusion that defines a cavity together with a mold is used (for example, Patent Document 3).

  In particular, as a heat sink die casting mold for manufacturing a heat sink having a plurality of heat radiating fins projecting in the same direction on the same side as the thick part with respect to the heat sink body, a local pressurizing (squeeze) method is adopted, A local pressurizing port for locally pressurizing is provided at a position opposite to the thick part cavity that molds the thick part. A mold having a structure in which the thickness is increased as compared with the fin portion away from the pressure port has been proposed (for example, Patent Document 4).

  In addition, in the case of a product having a cylindrical shape, for example, a center gate type die casting mold in which a gate is provided at the center of the product and molten metal is injected from the gate to the product portion has been proposed (for example, Patent Document 5). ).

JP 2009-142869 A JP 2009-208085 A JP 2017-87286 A Japanese Patent No. 4016849 International Publication No. 2015/151369

  In the die-casting die of Patent Document 1, the molten metal injected into the biscuit part flows in a plane substantially parallel to the mold dividing surface in which the fixed mold and the movable mold are combined, and passes through the runner part from the gate part to the product. It is injected into the part. In this case, the molten metal injected from the gate portion is injected at a high speed in a direction parallel to the mold dividing surface. Therefore, for example, as in the heat sink described above, if the fin pitch is small and the height direction of the thin fins is perpendicular to the mold dividing surface, the molten metal does not flow sufficiently in the height direction of the fins. There was a possibility that a hot water defect in which the molten metal was not filled at the tip in the height direction might occur.

  Even in the die-casting die of Patent Document 2, the molten metal injected from the sub-gate is injected at a high speed in a direction parallel to the mold dividing surface, and therefore against filling defects in a direction substantially parallel to the mold dividing surface. Has the effect of reinforcing the filling, but in the direction substantially perpendicular to the mold splitting surface, there is a possibility that a hot water run-out defect may occur as in the die-casting die of Patent Document 1.

  Not only in the case of the heat sink, but also in the case of the electronic device described in the embodiments of Patent Document 1 and Patent Document 2, when the case has a rib, the molten metal sufficiently flows to the tip of the rib. Therefore, there is a possibility that a hot water defect in which the molten metal is not filled at the tip in the height direction of the rib may occur. As described above, in the conventional die casting mold, when the product portion has a hollow portion having a large aspect ratio in the depth direction, there is a problem that a hot water run-out defect occurs.

  Furthermore, for example, SKD61, which is used as a material for die casting molds, has a smaller thermal shrinkage rate than the metal that is the material for die casting products, so when the metal solidifies during casting, the metal bites into the stationary mold and remains unfixed. There was a fear.

  The core of Patent Document 3 defines a cavity together with a fixed mold and a movable mold. That is, the core is provided in the product part between the fixed mold and the movable mold, and after being used to form a complicated shape of the product part, the core is pulled out from the cast die-cast product in a mold-closed state. . Therefore, the core does not contribute to the solution of the remaining fixing problem that occurs when the mold is opened.

  The die casting mold of Patent Document 4 is limited to a heat sink having a thick portion. Therefore, the degree of freedom in designing the die cast product is extremely limited.

  In Patent Document 5, in order to realize a center gate, an intermediate mold is disposed between a fixed mold and a movable mold to form a three-divided structure. In the case of the three-split type, there is a problem that the number of molds is increased by one and a control circuit for controlling the operation of the molds needs to be provided, resulting in an increase in manufacturing cost.

  The present invention has been made in view of such circumstances, and products having a shape with a large aspect ratio in a direction perpendicular to a mold dividing surface in which a fixed mold and a movable mold are combined, and products having a complicated shape. Provided is a die-casting die that can avoid poor hot water and improper fixing even when manufacturing. The present invention also provides a die-cast product manufactured with the die-casting die and a die-casting method using the die-casting die.

  In order to solve this problem, the present invention provides a fixed mold, a movable mold that is combined with the fixed mold at the time of casting, and a surface of the movable mold that faces the fixed mold when the movable mold is combined with the fixed mold. The movable insert so as to extend between a core insert portion formed in a predetermined shape, a slide core that can be inserted into and removed from the core insert portion, and the slide core inserted from a biscuit portion. There is provided a die casting mold including a formed runner portion and a gate portion formed by a gap between the movable gate forming surface and the upper surface of the inserted slide core.

  In the die-casting mold, the gate portion may be formed such that the molten metal is injected in a direction that is not parallel to a mold dividing surface where the movable mold and the fixed mold are combined.

  In the die casting mold, the non-parallel direction may be a direction substantially perpendicular to the mold dividing surface.

  The present invention provides a die cast product manufactured by the die casting mold.

  The present invention is formed in a predetermined shape on the surface of the fixed mold, the movable mold combined with the fixed mold at the time of casting, and the movable mold facing the fixed mold when the movable mold is combined with the fixed mold. A core insert portion, a slide core that can be inserted into and removed from the core insert portion, and a runner portion that is formed in the movable mold so as to extend from the biscuit portion to the inserted slide core. And a gate part formed by a gap between the movable-type gate forming surface and the inserted upper surface of the slide core, and using the die-casting mold, the slide in the core insertion part Manufacturing a die-cast product including a step of inserting a core to form the gate portion, and injecting molten metal from the gate portion in a direction not parallel to a mold dividing surface where the movable mold and the fixed mold are combined. Provide a way

  After the step of injecting the molten metal, the die cast product manufacturing method pulls the product formed in the product part to the movable mold side by pressing the runner formed in the movable runner part with the slide core. However, the method may further include a step of opening the mold.

  In the method for manufacturing a die-cast product, a molten metal that is injected from a biscuit portion and flows in a plane substantially parallel to the mold dividing surface is induced, and the molten metal is not parallel to the mold dividing surface from the gate portion. May inject in the direction.

  In the die cast product manufacturing method, the gate portion may be formed at the tip of a runner portion formed by extending from the biscuit portion through the movable mold side of the slide core to the upper surface of the slide core. .

  In the die-cast product manufacturing method, the non-parallel direction may be a substantially vertical direction with respect to the mold dividing surface.

  According to the method for manufacturing a die-cast product of the present invention, even if the die-cast product has a shape with a large aspect ratio, such as a fin of a heat sink, the molten metal is injected by injecting the melt toward a direction with a large aspect ratio. It is possible to prevent poor hot water that is not sufficiently filled.

It is a sectional side view of the die-cast apparatus containing the die-casting die concerning the embodiment of the present invention. It is a top view which shows the fixed type | mold containing a fixed nest and a fixed main type | mold same as the above. It is a top view which shows a movable mold | type containing a movable nest and a movable main mold | type same as the above. FIG. 2 is a perspective view of a die-casting die and a die-cast product cast in the die. FIG. 3 is a side sectional view showing a closed state where the fixed mold and the movable mold are combined. FIG. 3 is a side sectional view showing a mold open state in which the movable mold is separated from the fixed mold. It is a perspective view of the plan containing a biscuit, a runner, and a gate same as the above. It is a perspective view which shows a method and a slide core of the inserted state same as the above. It is a photograph figure of the product of the heat sink manufactured as a die-cast product of this embodiment same as the above. It is the figure which looked at the fixed type | mold, the slide core, and the plan from the movable type | mold side same as the above. It is the figure which looked at the fixed mold | type, the slide core, and the plan from the diagonal direction by the side of a movable mold | type same as the above. It is a side view which shows a fixed-type digging surface and hollow part, a slide core, and a plan part same as the above. It is a perspective view of fixed extrusion board ASSY same as the above. It is a sectional side view which expands and shows the structure of the gate part vicinity at the time of a mold closing same as the above. It is a sectional side view which expands and shows the structure of the gate part vicinity at the time of a mold opening same as the above. It is a figure which simulates a mode that a molten metal is filled same as the above and shows the initial stage of injection | pouring. It is a figure which simulates a mode that a molten metal is filled same as the above and shows the intermediate | middle stage of injection | pouring. It is a figure which simulates a mode that a molten metal is filled same as the above and shows the final result of injection | pouring. FIG. 6 is a diagram showing a flow of a procedure for opening a core from a mold-closed state, opening a core, and extruding a product, (A) mold closing, (B) movable mold separation, (C) mold opening, (D) Mold opening, (E) Core opening, (F) Product extrusion It is a flowchart which shows the flow of the procedure which opens a core from a mold closing state, opens a core, and extrudes a product same as the above. It is a photograph figure which shows the product at the time of manufacturing the heat sink of substantially the same shape as this embodiment with the conventional die-casting metal mold | die. It is a photograph figure containing the enlarged photograph figure of the vicinity of the gate of a product and the last filling part same as the above. It is a photograph figure of the plan (runner and gate) at the time of manufacturing a die-cast article with the die-casting die concerning this embodiment.

  Hereinafter, preferred embodiments of a method for manufacturing a die-cast product, a die-casting die, and a die-casting product manufactured with the die-casting die according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a die casting apparatus 2 using a die casting mold 1 of the present embodiment.

  The die casting apparatus 2 includes a die casting mold 1 including a fixed mold 3 and a movable mold 4 that are combined with each other during casting. The fixed mold 3 and the movable mold 4 can be manufactured using, for example, SKD61. A cylindrical injection sleeve 6 is connected so as to communicate with the product portion 14 in the die casting mold 1. The flow of the manufacturing method by the die casting method is as follows. First, the metal that is the material of the die-cast product 26 is melted to form a molten metal 19, and the molten metal 19 is poured from the opening 7 of the injection sleeve 6. The molten metal 19 is pushed into the die casting mold 1 at high speed and high pressure by the plunger tip 8. After the molten metal 19 is solidified, the movable mold 4 is opened and the product 24 is pushed out by the push pin 9.

  2 and 3 are plan views showing schematic configurations of the fixed mold 3 and the movable mold 4, respectively. The fixed mold 3 includes a fixed insert 103 and a fixed main mold 105. In the present embodiment, the description of the fixed mold 3 includes the fixed insert 103 and the fixed main mold 105. The movable mold 4 includes a movable insert 104 and a movable main mold 106. In this embodiment, when the movable mold 4 is described, the movable insert 104 and the movable main mold 106 are included.

  Referring to FIGS. 1 and 4, the die casting mold 1 includes a fixed mold 3, a movable mold 4 combined with the fixed mold 3 during casting, and a fixed mold when the movable mold 4 is combined with the fixed mold 3. 3 is inserted into the surface of the movable mold 4 facing the core 3 from a core insertion part 31 dug into a predetermined shape, a slide core 10 that can be inserted into and removed from the core insertion part 31, and a biscuit part 11. Between the runner portion 12 dug and formed in the movable mold 4 so as to extend between the slide core 10, the gate forming surface 16 of the movable mold 4, and the upper surface 17 of the inserted slide core 10. And a gate portion 13 (see FIG. 14) formed by a gap 18 (see FIG. 14).

  As shown in FIG. 1, the plan 20 includes a biscuit 21, a runner 22, a gate 23 and an overflow 25 connected to a product 24. Here, the biscuit 21, the runner 22, the gate 23, the product 24, and the overflow 25 are the fixed die 3, the movable die 4, or the biscuit portion 11, the runner portion 12, and the gate portion 13 formed in the die casting mold 1 including them. The molten metal 19 solidified in the product part 14 and the overflow part 15 shall be indicated. Method 20 is necessary only for casting, and is an unnecessary part for the final product. Therefore, the plan 20 is separated from the product 24, and the die-cast product 26 is completed. In the present embodiment, a product connected to the plan 20 is a product 24, and a product separated from the plan 20 is a die-cast product 26.

  As shown in FIGS. 5 and 6, the movable mold 4 can freely advance and retract between a mold closing position combined with the fixed mold 3 and a mold opening position separated from the fixed mold 3. The movable mold 4 is movable in the left direction in the figure so as to be separated from the fixed mold 3, and is movable in the right direction so as to approach.

  In this embodiment, unless otherwise specified, in a state where the fixed mold 3 and the movable mold 4 are combined, the direction from the fixed mold 3 to the movable mold 4 is the left direction, and the opposite direction of the left direction is the right direction. And In addition, the direction from the biscuit portion 11 toward the product portion 14 is an upward direction, and the opposite direction to the upward direction is a downward direction.

  The fixed mold 3 is provided with an injection sleeve 6 and a plunger tip 8 that can slide in the injection sleeve 6, and is configured such that a molten metal 19 can be injected into the injection sleeve 6 from the opening 7.

  The fixed mold 3 has a product forming surface 36 of the fixed mold 3 that forms an internal space (cavity) 32 as a product portion 14 together with the movable mold 4 and the slide core 10. The movable mold 4 has a product forming surface 37 of the movable mold 4 that forms a cavity 32 together with the fixed mold 3 and the slide core 10. The slide core 10 has a product forming surface 38 of the slide core 10 that forms a cavity 32 together with the fixed mold 3 and the movable mold 4.

  The product forming surface 36 of the fixed mold 3, the product forming surface 37 of the movable mold 4, and the product forming surface 38 of the slide core 10 come close to each other, thereby forming the cavity 32 inside the die casting mold 1, that is, the product portion 14. Is done. In the movable mold 4, the slide core 10 is inserted into the core insertion portion 31. When the movable mold 4 moves closer to the fixed mold 3 when the mold is closed, the product forming surfaces 36, 37, and 38 come closer to form the product portion 14.

  The slide core 10 slides in a direction substantially parallel to the product forming surface 38 of the slide core 10 and is inserted into and removed from the core insertion portion 31. As with the fixed mold 3 and the movable mold 4, the slide core 10 can be manufactured using, for example, SKD61.

  The biscuit part 11 is a part that receives the high-temperature molten metal 19 at a high speed.

  Referring to FIGS. 1 and 7, the runner portion 12 is a portion that guides the molten metal 19 injected into the biscuit portion 11 toward the product portion 14, and the molten metal 19 injected into the runner portion 12 is solidified. A runner 22 is formed. The runner 22 has an upstream portion 41 connected to the biscuit 21 and a downstream portion 42 connected to the gate 23. Here, unless otherwise specified, simply “upstream” refers to the upstream side of the flow of the molten metal 19, and simply “downstream” refers to the downstream side of the flow of the molten metal 19. FIG. 8 shows the slide core 10 in an inserted state in addition to the method 20 of FIG.

  As shown in FIGS. 6 to 8 and 12, the runner 22 includes a front runner 52 formed by a front runner portion 51 formed on the fixed mold 3 side of the slide core 10, and a movable type of the slide core 10. It includes a rear runner 54 formed by a rear runner portion 53 formed on the four side. 7 and 8, the gate 23 changes the flow direction of the molten metal 19 from the rear runner 54 to the movable mold 4 side of the slide core 10 to the product forming surface 36 of the fixed mold 3. And so as to rise in the vertical direction.

  The product part 14 is an internal space in which the product 24 is cast, and has a digging surface 33 corresponding to the product shape.

  FIG. 9 is a photograph of a die-cast product 26 of the heat sink 46 manufactured by the die-casting die 1 of the present embodiment. The heat sink 46 is composed of a flat plate portion 47 and a plurality of fins 48 having a height substantially perpendicular to the surface of the flat plate portion 47. In the heat sink 46 exemplified as the die cast product 26 of the present embodiment, the height direction of the fin 48 extends in a substantially vertical direction with respect to the product forming surface 38 of the slide core 10. The heat sink 46 can be used, for example, for cooling an Si / SiC power semiconductor module. In this case, the size of the heat sink 46 is preferably several cm to several tens of cm square. The size of the actually manufactured heat sink 46 of FIG. 9 was 160 mm × 90 mm.

  Referring to FIGS. 9 to 12, the fin 48 of the heat sink 46 is cast by supplying the molten metal 19 into the recess 34 formed in the digging surface 33. As shown in FIGS. 11 and 12, the recess 34 extends linearly from the lower side to the upper side of the fixed mold 3 and has a depth D to the right from the product forming surface 36 of the fixed mold 3. is doing. The depth D corresponds to the height H of the corresponding fin 48 of the heat sink 46. If the height H is high, the molten metal 19 is not filled up to the tips 49 of the fins 48, and hot water defects are likely to occur. When a conventional die casting mold is used, if the depth D (height H) is 10 mm or more, poor hot water is likely to occur, and if it is 20 mm or more, it is very difficult to fill the molten metal up to the tip 49 of the fin 48. is there. In the actually manufactured heat sink 46 of FIG. 9, the height of the fin 48 was set to 10 mm to 38 mm.

  As shown in FIGS. 5, 10, and 11, the shape of the slide core 10 is such that the tip 56 of the gate 23 is disposed near the gate side end 57 of the recess 34. Is substantially in line with a straight line connecting the gate side ends 57 of the plurality of depressions 34. Thus, the shape of the slide core 10 is designed to be an appropriate shape according to the shape of the die cast product 26 to be manufactured.

  If the fin pitch P, which is the distance between adjacent fins 48 shown in FIG. 9, is less than 5 mm, poor hot water is likely to occur, and if it is less than 3 mm, it is extremely difficult to fill the molten metal 19 up to the tips 49 of the fins 48. is there. The fin pitch P of the actually manufactured heat sink 46 of FIG. 9 was 1.7 mm to 2.7 mm.

  The overflow part 15 exhausts the air in the mold pushed out by the molten metal 19 from the product part 14, lowers the filling resistance of the molten metal 19, and pushes the molten metal 19 whose flow tip has deteriorated out of the product part 14. Part.

  A fixed extrusion plate ASSY 61 shown in FIG. 13 includes a fixed extrusion plate 62, a return pin 63 and an extrusion piece 64 that protrude substantially perpendicularly from the surface of the fixed extrusion plate 62. The fixed extrusion plate ASSY 61 is attached to the fixed mold 3 such that the surface 65 provided with the return pin 63 is aligned with the outer surface 66 of the fixed mold 3. The return pin 63 and the pushing piece 64 are inserted through holes 67 (see FIG. 10) and recesses 34 (see FIG. 10) provided in the fixed mold 3, respectively.

  For example, an aluminum alloy, a magnesium alloy, or a zinc alloy can be press-fitted into the die casting mold 1 according to the present embodiment as the molten metal 19. In addition, it is not limited to these materials, Various metal materials can be used as the molten metal 19.

  14 and 15 are enlarged side sectional views of the peripheral portion of the slide core 10 and show the state of fixed extrusion during mold opening. FIG. 14 shows a state in which the molten metal 19 is injected into the runner portion 12, the gate portion 13, and the product portion 14 in a state where the fixed die 3 and the movable die 4 are combined and closed. The runner portion 12 extends from the biscuit portion 11 provided outside the lower drawing in FIG. 14 to the slide core 10 inserted in the core insertion portion 31 in FIG. It is dug. Accordingly, the downstream portion 42 of the runner 22 is formed between the movable die 4 and the slide core 10. More specifically, the downstream portion 42 of the runner 22 is between the runner forming surface 39 of the movable mold 4 and the runner forming surface 40 of the slide core 10 which is the movable mold side surface of the slide core 10. It is formed. In other words, the slide core 10 is inserted between the runner 22 and the product 24. The product forming surface 38 of the slide core 10 and the product forming surface 37 of the movable die 4 are substantially flush with each other.

  The runner portion 12 is formed to extend from the biscuit portion 11 through the movable side of the slide core 10 to the upper surface 17 of the slide core 10. The gate portion 13 is formed at the tip 58 of the runner portion 12 opposite to the biscuit portion 11 side. The gate portion 13 is formed by inserting the slide core 10 into the core insertion portion 31 formed by digging into the movable die 4 in a predetermined shape. From the gate portion 13, the fixed die 3 and the movable die 4 are formed. The molten metal 19 is injected in a direction that is not parallel to the mold dividing surfaces 5 to be combined. The mold dividing surface 5 is a surface that faces each other when the fixed mold 3 and the movable mold 4 approach each other and when they are combined. The gate portion 13 is formed by a gap 18 between the gate forming surface 16 of the movable mold 4 and the upper surface 17 of the inserted slide core 10. Therefore, the gate portion 13 is formed in the tip region on the other side of the runner portion 12 from the biscuit portion 11 side. The gate forming surface 16 of the movable mold 4 is a surface along the movable mold 4 continuing from the runner portion 12.

  The upper surface 17 of the slide core 10 is inclined upward in the figure as it goes from the movable mold 4 side to the fixed mold 3 side. In the figure, since the gate forming surface 16 of the movable mold 4 is substantially horizontal, the gate portion 13 which is the gap 18 between the gate forming surface 16 of the movable mold 4 and the upper surface 17 of the slide core 10 is the product section. As it approaches 14, the thickness is sharply reduced. Thereby, the filling speed of the molten metal 19 from the gate part 13 toward the product part 14 is accelerated. The tip of the gate portion 13 is preferably formed so that the gate thickness of the cast product is about 1 to 1.5 mm, for example.

  The molten metal 19 injected from the biscuit part 11 flows in the plane of the runner part 12 substantially parallel to the mold dividing surface 5. According to the gate portion 13, the molten metal 19 can be guided and injected from the gate portion 13 in a direction not parallel to the mold dividing surface 5. When the height direction of the fin 48 is substantially perpendicular to the mold dividing surface 5 as in the present embodiment, the non-parallel direction can be substantially perpendicular to the mold dividing surface 5. Here, “substantially vertical” indicates that, for example, an error with respect to the vertical (90 °) of the angle formed by the straight line and the surface is within a predetermined angle range. “Within a predetermined angle range” means, for example, a state within ± 10 ° from the vertical direction.

  In FIG. 15, the molten metal 19 is injected into the product portion 14 to be cooled, and after the molten metal 19 has solidified, the runner 22 formed on the runner portion 12 of the movable mold 4 is pushed by the slide core 10, thereby A state is shown in which the mold 24 is opened while the product 24 formed in the above is pulled to the movable mold 4 side. In the conventional method for producing a die-cast product using a die-casting die, the product is only held in a movable die when the die is opened. On the other hand, in this embodiment, the front runner 52 and the rear runner 54 (see FIG. 8) are formed on the fixed mold 3 side and the movable mold 4 side of the slide core 10 to connect to the product 24. The runner 22 can be pushed by the slide core 10. In particular, the slide core 10 can directly push the runner downstream portion 42 of the rear runner 54. Therefore, the slide core 10 of the present embodiment also has an action of pulling out the product 24 from the fixed mold 3. Thereby, when the movable mold 4 is separated from the fixed mold 3 and the mold is opened, it is possible to prevent the solidified metal from biting into the fixed mold 3 and causing the remaining fixing.

  16-18 is a figure which shows the result of having simulated a mode that the molten metal 19 was filled in the product part 14. As shown in FIG. The product shape and size were the same as those of the actually manufactured heat sink 46 described above. As an analysis condition, simulation was performed assuming vacuum casting. In FIG. 16, the molten metal 19 injected from the biscuit portion 11 is injected from the gate portion 13 in the height direction of the fin 48 with respect to the product portion 14 and flows into the hollow portion 34 dug into the shape of the fin 48. Show how it started. In FIG. 17, the molten metal 19 is filled up to the tip end portions 71 of some fins in the vicinity of the gate portion 13 and further starts to flow into the vicinity of the final filling portion 72. FIG. 18 is a view in which the filling of the molten metal 19 is completed, and the molten metal 19 is sufficiently filled to every corner of the fin 48.

  The front end portion of the product portion 14 that is not filled with the sufficient molten metal 19 is in a densely packed state, which may cause casting defects such as insufficient strength. On the other hand, the heat sink 46 as the die-cast product 26 manufactured by the die-casting die 1 having the above characteristics is a thin fin 48, and the fin pitch P can be minimized. Furthermore, not only the straight-shaped fins 48 as in the present embodiment, but also curved fins are formed to further increase the surface area of the fins, so that further improvement of heat dissipation characteristics can be expected.

  An example of a specific method for manufacturing the die-cast product 26 of the present embodiment having the above-described configuration will be described based on FIG. 19 and a flowchart shown in FIG.

  First, the slide core 10 is inserted into the movable mold 4 (step S1). The movable mold 4 is brought close to the fixed mold 3, and the mold is closed in combination with the fixed mold 3 (step S2, FIG. 19A). The metal used as a raw material is melted to form a molten metal 19 (step S3). The molten metal 19 is injected from the opening 7 of the injection sleeve 6 and the plunger tip 8 is advanced in the direction of the arrow in FIG. 1, thereby injecting the molten metal 19 into the product portion 14 at high speed and high pressure (step S4). The molten metal 19 is solidified by cooling (step S5). The movable mold 4 is separated from the fixed mold 3 (step S5, FIG. 19B). At this time, the product 24 is fixedly extruded by the fixed extrusion plate 62 of the fixed mold 3, and the product 24 is pulled to the movable mold 4 side by the runner 22, and the product 24 is separated from the fixed mold 3 to open the mold. (Step S6, FIG. 19C and FIG. 19D). The slide core 10 is pulled out from the movable mold 4 to open the core (step S7, FIG. 19E). The product 24 is pushed out from the movable die 4 by the push pin 9 of the movable die 4 (step 8, FIG. 19F). The plan 20 is removed from the product 24 to obtain a die-cast product 26 having a desired shape.

  21 and 22 are photographic views showing the results of casting with a conventional die casting mold. The flow direction of the molten metal is an arrow direction in FIG. When the vicinity of the gate 76 on the upstream side is enlarged, some of the fins are filled up to the tip of the fin, but a plurality of fins that are not sufficiently filled up to the tip are also seen. When the vicinity of the final filling portion 77 on the downstream side is enlarged, it can be seen that the molten metal is not filled to the tip in most fins. As described above, in the conventional die casting mold in which the molten metal is injected from the gate in the direction perpendicular to the height direction of the fin, there is a hot water defect that the molten metal is not sufficiently filled up to the tip of the fin.

  On the other hand, as shown in FIG. 9, the heat sink 46, which is a die-cast product 26 manufactured using the die casting mold 1 of the present embodiment, can sufficiently fill the molten metal up to the tips 49 of all the fins 48. did it. Also, no fixed residue occurred. FIG. 23 shows a plan 20 connected to the product 24 of the die-cast product 26 of FIG. It can be seen that the gate 23 of the plan 20 stands up from the rear runner 54 in a substantially vertical direction.

  As described above, the die casting mold 1 according to the present embodiment has the fixed mold 3, the movable mold 4 combined with the fixed mold 3 at the time of casting, and the fixed mold 3 when the movable mold 4 is combined with the fixed mold 3. A core insertion portion 31 formed in a predetermined shape on the surface of the movable mold 4, a slide core 10 that can be inserted into and removed from the core insertion portion 31, and a slide core 10 inserted from the biscuit portion 11. A gate portion 13 formed by a gap 18 between the runner portion 12 formed on the movable mold 4 so as to extend between the gate forming surface 16 of the movable mold 4 and the upper surface 17 of the inserted slide core 10. And comprising.

  In this case, even if the die-cast product 26 has a shape with a large aspect ratio such as the fin 48 of the heat sink 46, the molten metal 19 is sufficiently injected by injecting the molten metal 19 toward the direction with the large aspect ratio. It is possible to prevent poor hot water that is not filled. Furthermore, when the movable mold 4 is separated from the fixed mold 3 and the mold is opened, it is possible to prevent the solidified metal from biting on the fixed mold 3 and causing the remaining immobilization.

  In the die casting mold 1 of the present embodiment, the gate portion 13 may be formed so that the molten metal is injected in a direction that is not parallel to the mold dividing surface 5 in which the movable mold 4 and the fixed mold 3 are combined. .

  In this case, the die-cast product 26 having a high degree of freedom in design can be manufactured without causing poor water circulation.

  In the die casting mold 1 of the present embodiment, the non-parallel direction may be a substantially vertical direction with respect to the mold dividing surface 5.

  In this case, for example, the heat sink 46 having a shape with a large aspect ratio in a direction substantially perpendicular to the mold dividing surface 5 can be manufactured without causing poor hot water.

  The die-cast product 26 of this embodiment is manufactured with the die-casting mold 1 described above.

  In this case, since poor hot water can be prevented even for complicated shapes, a high-performance die-cast product 26 such as a heat sink 46 having a high degree of design freedom and high heat dissipation and strength can be obtained. .

  In the present embodiment, the manufacturing method of the die-cast product 26 includes a fixed mold 3, a movable mold 4 combined with the fixed mold 3 at the time of casting, and a movable that faces the fixed mold 3 when the movable mold 4 is combined with the fixed mold 3. A core insertion portion 31 formed by digging into a predetermined shape on the surface of the mold 4, a slide core 10 that can be inserted into and removed from the core insertion portion 31, and a slide core 10 inserted from the biscuit portion 11. Formed by a gap 18 between the runner portion 12 dug and formed in the movable mold 4 so as to extend between the gate, the gate forming surface 16 of the movable mold 4 and the upper surface 17 of the inserted slide core 10. The gate part 13 is inserted into the core insertion part 31 to form the gate part 13 using the die-casting die 1 provided with the gate part 13, and the movable part 4 is fixed from the gate part 13. Including a step of injecting the molten metal 19 in a direction not parallel to the mold dividing surface 5 to be combined with the mold 3. Mu

  In this case, even if the die-cast product 26 has a shape with a large aspect ratio, such as the fin 48 of the heat sink 46, the molten metal 19 is sufficiently injected by injecting the molten metal 19 toward the direction with the large aspect ratio. It is possible to prevent poor hot water that is not filled in.

  The manufacturing method of the die-cast product 26 of this embodiment was formed in the product part 14 by pushing the runner 12 formed in the runner part 12 of the movable mold 4 with the slide core 10 after the step of injecting the molten metal 19. It may further include a step of opening the mold while pulling the product 24 to the movable mold 4 side.

  In this case, when the movable mold 4 is separated from the fixed mold 3 and the mold is opened, the solidified metal bites into the fixed mold 3 to prevent the occurrence of the remaining fixed.

  In the manufacturing method of the die-cast product 26 of this embodiment, the molten metal 19 which is poured from the biscuit part 11 and flows in a plane substantially parallel to the mold dividing surface 5 is guided, and the molten metal 19 is divided from the gate part 13 into the mold. In some cases, the light is emitted in a direction not parallel to the surface 5.

  In this case, the molten metal 19 can be injected in a predetermined direction from the gate portion 13 without using a costly method such as a center gate type.

  In the manufacturing method of the die-cast product 26 of the present embodiment, the gate portion 13 extends from the biscuit portion 11 through the movable mold 4 side of the slide core 10 to the upper surface 17 of the slide core 10 and is formed at the tip of the runner portion 12. 58 may be formed.

  In this case, the molten metal 19 is appropriately guided to the gate portion 13 during casting, and the runner 22 is pushed toward the movable mold 4 by the slide core 10 when the mold is opened, and the product 24 connected to the runner 22 is pulled from the fixed mold 3. be able to.

  In the manufacturing method of the die-cast product 26 of the present embodiment, the non-parallel direction may be a direction substantially perpendicular to the mold dividing surface 5.

  In this case, for example, the heat sink 46 having a shape with a large aspect ratio in a direction substantially perpendicular to the mold dividing surface 5 can be manufactured without causing poor hot water.

  While the present invention has been described based on the embodiments, the present invention can be modified in various ways. For example, the present invention is not limited to the heat sink 46 exemplified in the present embodiment, but also other die castings such as a heat sink having curved fins, a heat sink having a complicated shape for LED lighting, and a casing having a rib with a large aspect ratio. It can also be applied to the manufacture of product 26.

1 Die-casting die 3 Fixed die 4 Movable die 5 Dividing surface
10 Slide core
11 Biscuit
12 Runner
13 Gate part
14 Product Department
16 Gate forming surface
17 Top of slide core
18 gap
19 Molten metal
22 Runner
24 products
26 Die-cast products
31 Core insertion part

Claims (9)

Fixed type,
A movable mold combined with the fixed mold at the time of casting;
A core insertion portion formed in a predetermined shape on the surface of the movable mold facing the fixed mold when the movable mold is combined with the fixed mold;
A slide core that can be inserted into and removed from the core insertion portion;
A runner part formed on the movable mold so as to extend from the biscuit part to the inserted slide core;
A gate portion formed by a gap between the movable gate forming surface and the upper surface of the inserted slide core;
Die casting mold equipped with.   The die-casting die according to claim 1, wherein the gate portion is formed such that the molten metal is injected in a direction that is not parallel to a mold dividing surface where the movable die and the fixed die are combined.   The die casting mold according to claim 2, wherein the non-parallel direction is a direction substantially perpendicular to the mold dividing surface.   The die-cast product manufactured with the die-casting die of any one of Claims 1-3. Fixed type,
A movable mold combined with the fixed mold at the time of casting;
A core insertion portion formed in a predetermined shape on the surface of the movable mold facing the fixed mold when the movable mold is combined with the fixed mold;
A slide core that can be inserted into and removed from the core insertion portion;
A runner part formed on the movable mold so as to extend from the biscuit part to the inserted slide core;
A gate portion formed by a gap between the movable gate forming surface and the upper surface of the inserted slide core;
Using die casting mold with
The sliding core is inserted into the core insertion portion to form the gate portion, and molten metal is injected from the gate portion in a direction that is not parallel to the mold dividing surface where the movable mold and the fixed mold are combined. A method for producing a die-cast product, comprising the step of:   After the step of injecting the molten metal, the step of further opening the mold while pulling the product formed in the product part to the movable mold side by pressing the runner formed in the movable type runner part with the slide core. The manufacturing method of the die-cast article of Claim 5 containing.   The molten metal injected from the biscuit portion and flowing in a plane substantially parallel to the mold dividing surface is guided, and the molten metal is injected from the gate portion in a direction not parallel to the mold dividing surface. 6. A method for producing a die-cast product according to 6.   The die cast product manufacturing method according to claim 7, wherein the gate portion is formed at a tip of a runner portion formed to extend from the biscuit portion through a movable mold side of the slide core to an upper surface of the slide core. . The method for producing a die-cast product according to any one of claims 5 to 8, wherein the non-parallel direction is a direction substantially perpendicular to the mold dividing surface.