JP7658217B2 - Mold cooling structure - Google Patents

Description

The present invention relates to a cooling structure for a mold.

Patent Document 1 discloses a mold in which a groove is provided along the mating surfaces of the mold body and/or cavity member, and the groove is used as a cooling medium flow path.

Japanese Patent Application Publication No. 3-244518

When creating grooves as cooling medium flow paths in a large mold, the process of creating the grooves takes time, which increases the time required to manufacture the mold. This leaves room for improvement in improving mold productivity.

The present invention was made in consideration of the above problems, and provides a mold cooling structure that can shorten the mold manufacturing time and improve productivity.

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 portions,
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.

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 create a cooling structure that follows the mold shape without providing grooves that follow the surface shape of the mold. Therefore, the time required to manufacture the mold can be shortened, and productivity can be improved.

The present invention provides a mold cooling structure that can shorten the mold manufacturing time and improve productivity.

1 is a front cross-sectional view showing a cooling structure of a mold according to a first embodiment. FIG. FIG. 11 is a front cross-sectional view showing a cooling structure of a mold according to a second embodiment.

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 the vertical upward direction. Furthermore, the xy plane is the horizontal plane.

<First embodiment>
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, the cooling structures 1A and 1B provided on 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.

As shown in FIG. 1, the mold 10 cooled by the cooling structures 1A and 1B according to this 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 at least two or more concave structures corresponding to the convex structures 10A and 10B. A cavity C, which is a void, 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, and a casting is formed.

The mold 10 shown in FIG. 1 is formed using a material with excellent high-temperature resistance. Therefore, when the molten metal is filled into the cavity C, the mold 10 is unlikely to deform due to the heat of the molten metal. In addition, since the mold 10 is equipped with cooling structures 1A and 1B, the molten metal filled into the cavity C can be efficiently cooled. Therefore, the mold 10 equipped with cooling structures 1A and 1B is suitable for use as a die-casting mold.

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

Furthermore, it is preferable to reduce the thickness of the protruding structures 10A, 10B of the mold 10 to a degree that does not cause deformation due to the heat of the molten metal or casting, 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 even more efficiently.

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 refrigerant circulation parts 3A, 3B and connection parts 4A, 4B. The bush 2 is preferably formed using a metal material that has excellent corrosion resistance and thermal conductivity. The bush 2 is formed, for example, using copper or aluminum.

As shown in FIG. 1, the bush 2 has at least two refrigerant circulation sections 3A, 3B. Each refrigerant circulation section 3A, 3B is provided to correspond to a protruding structure 10A, 10B of the mold 10. More specifically, each refrigerant circulation section 3A, 3B has a flow path width W1, W2, W3 that corresponds to the shape of each protruding structure 10A, 10B.

The shape and flow path width W of the refrigerant circulation sections 3A and 3B can be changed as appropriate depending on the shape of the convex structure of the mold 10. As an example, the flow path width W1 of the refrigerant circulation section 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 section 3B shown in FIG. 1 are formed to correspond to the shape of the convex structure 10B in order to perform cooling more efficiently. In other words, the refrigerant circulation sections 3A and 3B each have a different flow path width.

More specifically, the flow path width of the refrigerant circulation section 3B is W2 on the lower surface side (z-axis negative side) of the mold 10, and W2+W3 on the upper surface side (z-axis positive side). If 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 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 are inclined from the upper surface (z-axis positive surface) to the lower surface (z-axis negative surface) of the mold 10, the refrigerant circulation sections 3A and 3B may be provided in an inverted truncated cone shape with a slope that follows the slope of each of the convex structures 10A and 10B.

The connection parts 4A and 4B are parts that are connected to pipes (not shown) arranged outside the cooling structures 1A and 1B. The pipes are connected to pumps (not shown) arranged outside the cooling structures 1A and 1B, respectively. The pipes and pumps are used to circulate the refrigerant through the refrigerant circulation parts 3A and 3B. The mold 10 is cooled by circulating the refrigerant through the refrigerant circulation parts 3A and 3B. The refrigerant circulating through the refrigerant circulation parts 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 parts 3A and 3B is, for example, water.

The above has been described with reference to Figure 1 as an example of a mold having two convex structures, but is not limited to this. For example, if the mold has three convex structures, it may have three cooling holes and three refrigerant circulation sections corresponding to the convex structures. The flow path width of each refrigerant circulation section can be changed as appropriate depending on the shape of each convex structure. In other words, it is possible to arrange multiple cooling holes and refrigerant circulation sections corresponding to the number and shape of the convex structures.

When creating grooves as cooling medium flow paths in a large mold, the process of creating the grooves takes time, which increases the time required to manufacture the mold. This leaves room for improvement in improving mold productivity.

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 includes 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.

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 create a cooling structure that follows the mold shape without providing grooves that follow the surface shape of the mold. Therefore, the time required to manufacture the mold can be shortened, and productivity can be improved.

Furthermore, in the cooling structure of the mold according to the present invention, it is possible to arrange multiple cooling structures each having a refrigerant circulation section with a flow path width corresponding to the shape of the multiple convex structures of the mold. Therefore, even in the case of a large mold or a mold with a complex convex structure, it is possible to arrange multiple 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.

<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 connecting portions 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.

Figure 2 is a front cross-sectional view showing the cooling structure of the mold according to the second embodiment. As shown in Figure 2, the cooling structure 20A includes a cooling joint 14A. The cooling joint 14A includes a cooling pipe 15 on one side that is arranged 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 through it. The refrigerant circulates from the 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 one direction.

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

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

As an example, the relatively small cooling structure 20A is provided with a cooling pipe 15, and the relatively large cooling structure 20B is provided with a separator 16. However, this is not limited to this, and each structure may be configured to direct the flow of 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.

In the cooling structure of this embodiment, the flow of the refrigerant is unidirectional, allowing the refrigerant to circulate more efficiently and cool the mold. This improves the cooling performance of the mold.

The present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit and scope of the invention.

Reference Signs 1A, 1B Cooling structure 2 Bushing 3A, 3B Coolant circulation section 4A, 4B Connection section 10 Mold 10A, 10B Convex structure 11A, 11B Cooling hole 13A, 13B Coolant circulation section 14A, 14B Cooling joint 15 Cooling pipe 16 Separator 20A, 20B Cooling structure C Cavity W Flow path width

Claims (1)

A mold having at least two or more protruding 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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