JPH04109121U - injection mold - Google Patents

Abstract

(57) [Summary] [Purpose] In the case of an injection mold that integrates two metal members, a sharp edge is formed on one side to eliminate the need for a rubber seal and improve heat resistance. [Structure] When a first metal member 1 having a molding recess 2 formed on its main surface and a second metal member 4 are integrated, at least one of the first and second metal members is A cooling water groove is formed on the opposing surface, and the first or second
A sharp edge 6 that annularly surrounds the cooling water groove is formed on one of the metal members and is dug into the other metal member, thereby preventing leakage of cooling water from the cooling water groove and eliminating the need for a rubber seal. This structure has improved heat resistance.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an injection mold for injection molding resin, especially for audio ・Injection molding suitable for injection molding resin molded products with complex shapes such as cassette halves. Regarding shape molds.

0002

[Conventional technology]

In Utility Application No. 2-94804 from the present applicant, a forming recess is provided in the first metal member. A cooling water groove forming a cooling circuit is formed on the contact surface of the second metal member that is in contact with the second metal member. A new configuration has been proposed. In this case, the degree of freedom in arranging the cooling water groove increases. , it has the advantage of minimizing temperature distribution even in complex molding recesses. Ru.

0003

[Problem that the idea aims to solve]

By the way, if the structure is a combination of the first and second metal members, the joint between the two The problem of cooling water leakage occurs. Here, the first and second metal members are tightened with bolts. If you want to integrate the parts by tightening them, it is possible to use an O-ring (made of rubber). Viton (rubber type), which has a low heat resistance temperature and is slightly higher, can only hold up to 140℃ at most. However, the heat resistance of the watertight seal part was poor.

0004 In view of the above points, the present invention provides a first metal member having a molding recess and a second metal member. Even with a structure in which parts are mechanically integrated, cooling water leakage can be a problem during resin molding. We provide injection molds with a sealing structure that reliably prevents heat-related problems and has excellent heat resistance. The purpose is to

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention provides a first gold plate having a molding recess formed on its main surface. a metal member, and a second metal member that is in contact with a surface opposite to the main surface of the first metal member. In the injection mold comprising: at least one of the first and second metal members; A cooling water groove is formed in one of the contact surfaces of the first or second metal member. a sharp edge annularly surrounding the cooling water groove is formed on one side; The second metal member is mechanically integrated.

[0006]

[Effect]

In the injection mold of the present invention, the first metal members are mechanically joined and integrated with each other. and a cooling water groove is formed on the opposing surface of at least one of the second metal members, The sharp edge surrounding the cooling water groove in an annular shape is attached to one of the first or second metal members. It is formed in the opposite direction. As a result, the first metal member and the second metal member are connected with bolts, etc. Sharpness formed on the side of hard metal parts when mechanically tightened and integrated ・The edge will dig into the contact surface of the softer metal member, causing shear. This ensures that the cooling water groove, which is annularly surrounded by the edge, is watertightly sealed. In addition, since rubber products such as O-rings are not used, the rubber seal can withstand temperatures below 100℃. High heat resistance of 600℃ or more can be ensured, and the seal structure is simple. Moreover, it has the advantage of high reliability. As a result, resin composition caused by cooling water leakage Any inconvenience caused by the shape can be reliably eliminated.

[0007]

【Example】

Embodiments of the injection mold according to the present invention will be described below with reference to the drawings.

[0008] In FIGS. 1 and 2, 1 is a first metal member with high surface hardness such as die steel, 4 is a second metal member with high thermal conductivity such as beryllium copper alloy or nickel copper alloy. Ru. A molding recess 2 is formed on the main surface of the first metal member 1 . here , the shape is aimed at audio cassette half. Also, the first gold A cooling water groove 3 is formed on the opposite surface of the main surface of the metal member 1, and the cooling water groove 3 is formed in a second The metal member 4 is integrated to form one or more cooling water passages W. It is something. Further, on the bottom surface of the second metal member 4, the cooling water of the cooling water passage W is introduced. The hole 5A and the lead-out hole 5B are open. The opposite surface of the main surface of the first metal member 1 ( In other words, the one or more cooling water passages are provided on the surface facing the second metal member 4. A sharp edge 6 as shown in FIG. 2 is formed which surrounds the road W in an annular shape. So Then, the second metal member 4 is tightened with the bolt 7 against the facing surface of the first metal member 1. be integrated. That is, the bolt 7 inserted from the back side of the second metal member 4 is screwed into the female thread of the first metal member 1 to tighten and integrate both metal members. Ru. At this time, the sharp edge 6 on the first metal member side, such as hard die steel, should be The material also bites into the contact surface of the second metal member 4, which is made of a soft copper-based material, and this biting Inner contact surfaces of the sharp edges 6 of the first and second metal members 1 and 4 In other words, the portion where the cooling water passage W is formed is reliably sealed watertight. Ru.

[0009] In the above embodiment, an audio cassette half is used as the molding recess 2. Although the shape is shown as an example, it can be changed to a shape suitable for other molded products. Accordingly, the arrangement of the cooling water grooves can also be changed freely. In addition, the cooling water groove It is also possible to form a sharp edge on the abutting surface of the second metal member.

0010

[Effect of the idea]

As explained above, the injection mold of the present invention has a first mold having a molding recess. When mechanically integrating a second metal member with a metal member, one of the metal members It is recommended to form a sharp edge on the metal member to encircle the cooling water passage. This allows the sharp edges to come into contact with each other when the first and second metal members are integrated. The cooling water passage can be reliably sealed watertight by biting into the other metal member. It is possible to reliably prevent cooling water leakage, which is a problem during resin molding. in this case, There is no need to use rubber seals such as O-rings, and with rubber seals the temperature is below 100℃ The heat resistance can be increased to 600℃ or higher, which increases reliability. . Furthermore, there are no concerns about buckling or metal fatigue as with sandwich metal seals.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an embodiment of an injection mold according to the present invention.

FIG. 2 is an enlarged sectional view of the same main part.

[Explanation of symbols]

1 First metal member 2 Recess for molding 3 Cooling water groove 4 Second metal member 6 Sharp Edge W Cooling water passage

Claims (1)

[Scope of utility model registration request] 1. An injection mold comprising: a first metal member having a molding recess formed on its main surface; and a second metal member facing a surface opposite to the main surface of the first metal member. A cooling water groove is formed in the opposing surface of at least one of the first and second metal members, and a sharp ring that annularly surrounds the cooling water groove is formed in one of the first or second metal members. - An injection mold characterized in that an edge is formed to mechanically integrate the first and second metal members.