Mold cooling structure

Abstract

To provide a cooling structure for a mold in which the time for mold fabrication may be reduced and the productivity may be improved.SOLUTION: Cooling structures 1A, 1B have bush 2 on the inner circumferential surfaces of at least two or more cooling holes 11A, 11B provided inside a mold 10 having at least two or more projecting structures 10A, 10B. The bush 2 has at least two or more refrigerant circulation parts 3A, 3B. Each refrigerant circulation part 3A, 3B is provided to correspond to the projecting structures 10A, 10B of the mold 10, and each has a channel width W corresponding to the shape of each projecting structure 10A, 10B.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cooling structure for a mold. [Background technology]

[0002] Patent Document 1 discloses a mold in which grooves are provided in one or both of the mold body and the cavity member along the mating surfaces of the two, and the grooves are used as coolant flow paths. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 3-244518 Summary of the Invention [Problem to be solved by the invention]

[0004] When providing grooves as cooling medium passages in a large mold, the process of providing the grooves takes time, which increases the time required for mold production. This leaves room for improvement in mold productivity.

[0005] The present invention has been made in consideration of the above problems, and provides a mold cooling structure that can shorten the mold manufacturing time and improve productivity. [Means for solving the problem]

[0006] The cooling structure of the mold according to the present invention comprises: A cooling structure including a bush on an inner peripheral surface of at least two cooling holes provided inside a mold having at least two convex structures, The bushing has at least two or more refrigerant circulation parts, Each of the coolant circulation portions is provided to correspond to the protruding structure of the mold, and has a flow path width corresponding to the shape of each of the protruding structures.

[0007] In the cooling structure of the mold according to the present invention, each refrigerant circulation section is provided to correspond to the convex structure of the mold, and each has a flow path width according to the shape of the convex structure. When forming the refrigerant circulation section, it is possible to obtain a cooling structure that conforms to the mold shape without providing a groove that conforms to the surface shape of the mold. Therefore, the time required for mold production can be shortened, and productivity can be improved. Effect of the Invention

[0008] According to the present invention, it is possible to provide a mold cooling structure that can shorten the mold manufacturing time and improve productivity. [Brief description of the drawings]

[0009] [Figure 1] 1 is a front cross-sectional view showing a cooling structure of a mold according to a first embodiment. [Diagram 2] FIG. 11 is a front cross-sectional view showing a cooling structure of a mold according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. The right-handed xyz coordinate system shown in the figure is for the convenience of explaining the positional relationship of the components. Unless otherwise specified, the positive direction of the z axis is vertically upward. Also, the xy plane is a horizontal plane.

[0011] <Embodiment 1> Fig. 1 is a front cross-sectional view showing a cooling structure for a mold according to embodiment 1. A mold 10 is cooled by cooling structures 1A and 1B according to the present embodiment. As shown in Fig. 1, cooling structures 1A and 1B provided in the mold 10 include cooling holes 11A and 11B and a bush 2. The bush 2 includes refrigerant circulation portions 3A and 3B and connection portions 4A and 4B.

[0012] As shown in Fig. 1, a mold 10 cooled by cooling structures 1A and 1B according to the present embodiment is a mold having at least two or more convex structures 10A and 10B, for example a casting mold. The mold 10 is used in combination with a mold (not shown) having a concave structure corresponding to the at least two or more convex structures 10A and 10B. A cavity C, which is a gap, is formed by the outer peripheral surface of the convex mold 10 and the inner peripheral surface of the concave mold, and molten metal is filled into the cavity C. The molten metal filled into the cavity C is cooled by the cooling structures 1A and 1B to form a casting.

[0013] The mold 10 shown in Fig. 1 is made of a material having excellent resistance to high temperatures. Therefore, the mold 10 is unlikely to deform due to the heat of the molten metal when the molten metal is filled into the cavity C. In addition, the mold 10 is provided with the cooling structures 1A and 1B, so that the molten metal filled into the cavity C can be efficiently cooled. Therefore, the mold 10 provided with the cooling structures 1A and 1B is suitable for use as a die for die casting.

[0014] As shown in FIG. 1, the z-axis positive side of the mold 10 is open, and the inside of the mold 10 is provided with cooling holes 11A, 11B formed to correspond to the convex structures 10A, 10B of the mold 10. More specifically, the front cross-sectional shape of the cooling holes 11A, 11B is preferably similar to the shape of the outer circumferential surface of the convex structures 10A, 10B of the mold 10. That is, when the convex structures 10A, 10B have an inclination as shown in FIG. 1, it is preferable that the cooling holes 11A, 11B also have a shape that follows the inclination. In other words, it is preferable that the cooling holes 11A, 11B are provided near the cavity C. If the cooling holes 11A, 11B are provided near the cavity C, the molten metal filled in the cavity C can be cooled more efficiently.

[0015] Furthermore, it is preferable to reduce the thickness of the protruding structures 10A, 10B of the mold 10 to an extent that deformation due to the heat of the molten metal or casting does not occur, and to shorten the distance from the cavity C to the cooling holes 11A, 11B. By reducing the thickness of the protruding structures 10A, 10B of the mold 10, the molten metal filled in the cavity C can be cooled more efficiently.

[0016] As shown in Fig. 1, the bush 2 is disposed on the inner circumferential surface of the cooling holes 11A, 11B. The bush 2 is a metal member and includes coolant circulation parts 3A, 3B and connection parts 4A, 4B. The bush 2 is preferably formed using a metal material having excellent corrosion resistance and thermal conductivity. The bush 2 is formed using, for example, copper or aluminum.

[0017] 1, the bush 2 has at least two or more refrigerant circulation parts 3A, 3B. The refrigerant circulation parts 3A, 3B are provided to correspond to the convex structures 10A, 10B of the mold 10. More specifically, the refrigerant circulation parts 3A, 3B have flow path widths W1, W2, W3 corresponding to the shapes of the convex structures 10A, 10B, respectively.

[0018] The shapes and flow path width W of the refrigerant circulation parts 3A and 3B can be appropriately changed according to the shape of the convex structure of the mold 10. As an example, the flow path width W1 of the refrigerant circulation part 3A shown in FIG. 1 is formed to correspond to the shape of the convex structure 10A in order to perform cooling more efficiently. Also, the flow path widths W2 and W3 of the refrigerant circulation part 3B shown in FIG. 1 are formed to correspond to the shape of the convex structure 10B in order to perform cooling more efficiently. That is, the refrigerant circulation parts 3A and 3B each have a different flow path width.

[0019] More specifically, the flow path width of the refrigerant circulation section 3B has a flow path width W2 on the lower surface side (z-axis negative side) of the mold 10 and a flow path width W2 + W3 on the upper surface side (z-axis positive side). Assuming that the width of the surface on the z-axis negative side of the convex structure 10B (the width of the surface on the z-axis negative side of the cooling hole 11B) is B, the relationship between the widths is W2 < B < W2 + W3, but it is not limited to this. For example, as shown in FIG. 1, when the shapes of the convex structures 10A and 10B of the mold 10 have inclinations from the upper surface (the surface on the z-axis positive side) to the lower surface (the surface on the z-axis negative side) of the mold 10, respectively, the refrigerant circulation sections 3A and 3B may be provided in an inverted frustum shape having an inclination along each inclination of the convex structures 10A and 10B.

[0020] The connection parts 4A and 4B are parts connected to pipes (not shown) arranged outside the cooling structures 1A and 1B. The pipes are respectively connected to pumps (not shown) arranged outside the cooling structures 1A and 1B. Using the pipes and the pumps, refrigerant is circulated through the refrigerant circulation sections 3A and 3B. When refrigerant circulates through the refrigerant circulation sections 3A and 3B, the mold 10 is cooled. The refrigerant circulating through the refrigerant circulation sections 3A and 3B may be any fluid capable of cooling the bush 2 and is not particularly limited. The refrigerant circulating through the refrigerant circulation sections 3A and 3B is, for example, water.

[0021] As described above, an example has been described with reference to FIG. 1 when there are two convex structures on the mold, but it is not limited to this. For example, when there are three convex structures on the mold, it is also possible to have three cooling holes and three refrigerant circulation sections corresponding to the convex structures, respectively. The flow path width of each refrigerant circulation section can be appropriately changed according to the shape of each convex structure. That is, it is possible to arrange a plurality of cooling holes and refrigerant circulation sections corresponding to the number and shape of the convex structures.

[0022] When providing grooves as cooling medium flow paths in a large mold, since the process of providing the grooves takes time, the time required for mold production becomes long. For this reason, there has been a problem that there is room for improvement in improving the productivity of the mold.

[0023] In contrast, the cooling structure of the present invention is a cooling structure that includes a bush on the inner surface of at least two cooling holes provided inside a mold having at least two convex structures, and the bush has at least two refrigerant circulation sections, each of which is provided to correspond to a convex structure of the mold and has a flow path width corresponding to the shape of each convex structure.

[0024] In the cooling structure of the mold according to the present invention, each refrigerant circulation section is provided to correspond to the convex structure of the mold, and each has a flow path width according to the shape of the convex structure. When forming the refrigerant circulation section, it is possible to obtain a cooling structure that conforms to the mold shape without providing a groove that conforms to the surface shape of the mold. Therefore, the time required for mold production can be shortened, and productivity can be improved.

[0025] Furthermore, in the cooling structure for a mold according to the present invention, it is possible to arrange a plurality of cooling structures each having a refrigerant circulating section with a flow path width corresponding to the shape of the plurality of convex structures of the mold. Therefore, even in the case of a large mold or a mold having a complex convex structure, it is possible to arrange a plurality of cooling structures that can effectively cool the mold according to the shape of the mold. Therefore, it is possible to improve the cooling performance of the mold.

[0026] <Embodiment 2> The difference from embodiment 1 is that cooling structures 20A, 20B according to the present embodiment are provided with cooling joints 14A, 14B instead of connection parts 4A, 4B, and other structures are similar to those of embodiment 1. Therefore, the same components as those of embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.

[0027] FIG. 2 is a front cross-sectional view showing the cooling structure of the mold according to the second embodiment. As shown in FIG. 2, the cooling structure 20A includes a cooling joint 14A. The cooling joint 14A includes a cooling pipe 15 arranged on one side so as to extend toward the inside of the refrigerant circulation section 13A. The cooling pipe 15 is connected to a pipe (not shown) arranged outside the cooling structure 20A via the cooling joint 14A, and can pass a refrigerant. The refrigerant circulates from a pipe (not shown) arranged outside the cooling structure 20A through the cooling pipe 15 toward the negative side of the z-axis, and from the tip side (negative side of the z-axis) of the cooling pipe 15 toward the cooling joint 14A side. The flow of the refrigerant is indicated by dashed arrows. That is, by providing the cooling pipe 15, the flow of the refrigerant can be circulated in a fixed direction.

[0028] On the other hand, cooling structure 20B, which is larger than cooling structure 20A, includes cooling joint 14B. Cooling joint 14B includes separator 16 that divides the inside of refrigerant circulation unit 13B instead of cooling pipe 15. By dividing the inside of refrigerant circulation unit 13B with separator 16, the flow of refrigerant in refrigerant circulation unit 13B can be circulated in one direction. The flow of refrigerant is indicated by dashed arrows.

[0029] The mold 10 is cooled by circulating the coolant through the coolant circulation parts 13A and 13B. The coolant circulating through the coolant circulation parts 13A and 13B is not particularly limited as long as it is a fluid capable of cooling the bush 2. The coolant circulating through the coolant circulation parts 13A and 13B is, for example, water.

[0030] As an example, the relatively small cooling structure 20A is provided with the cooling pipes 15, and the relatively large cooling structure 20B is provided with the separators 16. However, the present invention is not limited to this, and each structure may be configured to direct the flow of the refrigerant in one direction. For example, the relatively small cooling structure may be provided with a separator, and the relatively large cooling structure may be provided with a cooling pipe. Furthermore, regardless of the size of the cooling structure, each may be provided with a cooling pipe or a separator.

[0031] In the cooling structure according to the present embodiment, the flow of the coolant is unidirectional, so that the coolant can be circulated more efficiently to cool the mold, thereby improving the cooling performance of the mold.

[0032] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0033] 1A, 1B cooling structure 2. Bush 3A, 3B Refrigerant circulation section 4A, 4B connection 10. Mold 10A, 10B convex structure 11A, 11B cooling hole 13A, 13B Refrigerant circulation section 14A, 14B Cooling joint 15 Cooling pipe 16 Separator 20A, 20B cooling structure C Cavity W Flow path width

Claims

[Claim 1] A mold having at least two or more convex structures, At least two cooling holes provided inside the mold; a bush provided on an inner circumferential surface of the cooling hole, The bushing is At least two refrigerant circulation units; a cooling joint having a cooling pipe arranged on one side so as to extend toward the inside of the refrigerant circulation part, or having a separator that divides the inside of the refrigerant circulation part instead of the cooling pipe; Each of the refrigerant circulation sections is provided to correspond to the convex structure of the mold, and has a flow path width corresponding to the shape of each of the convex structures, When the cooling joint has the cooling pipe on one side, the coolant is caused to flow from an externally disposed pipe through the cooling pipe to the tip side of the cooling pipe, and then caused to flow from the tip side of the cooling pipe to the cooling joint side on the outside of the cooling pipe, thereby determining the flow of the coolant and circulating it; When the cooling joint has the separator, the inside of the refrigerant circulation part is divided by the separator, so that the flow of the refrigerant is determined and circulated. Mold cooling structure.

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