JPH03140213A - Resin mold for molding resin - Google Patents

Abstract

PURPOSE:To contrive to improve the accuracy of the molding dimensions of a molded item by a method wherein carbon fibers, crystals of which are orientated to the longitudinal direction of fiber, are laminarly imbedded in a resin mold for molding resin. CONSTITUTION:Carbon fiber cloth 16, the graphite-type crystal structure of the fiber of which is orientated to the longitudinal direction of fiber and the part corresponding to a molded item matrix 12 of which has been cut off, is impregnated with molding resin in order to obtain resin-impregnated cloth 15. On the other hand, the molded item matrix 12 is set in a mold form 11 so as to form molding resin layer 13 by applying liquid molding resin onto the inner wall of the mold form 11 and onto the surface of the molded item matrix 12. To the resultant mold form 11, the resin- impregnated cloth 15 and liquid molding resin are laminated so as to produce a cavity mold 17 after being fully hardened, After that, both the molded item matrix 12 and the cavity mold 17 are turned upside down in the mold form 11. On to the cavity mold 17 and the molded item matrix 18, both of which ate turned upside down, the resin-impregnated cloth 15 and liquid molding resin are repeatedly laminated and hardened so as to produce a core mold 18. After that, by being taken out of the mold form 11 and by removing the molded item matrix 12, a resin mold for molding resin is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simple resin mold that replaces a metal assembly mold for resin molding.

[Conventional technology]

Conventionally, simple resin molds for resin molding have been manufactured by the method shown in FIG. That is, a molded product matrix 12 is set in a mold 11 as shown in FIG. 6(a).

Next, as shown in FIG. 6(b), liquid thermosetting resin such as epoxy or polyimide and metal powder with good thermal conductivity such as aluminum or copper were mixed in the mold 11. Pour mold resin mixture 67A. Here mold resin mixture 6
The reason for mixing metal powder in 7A is mold resin mixture 6.
This is to improve the thermal conductivity of the cavity mold 67B formed by curing 7A and to speed up the heat dissipation of the mold. continue,
As shown in FIG. 6(c), the cured cavity mold 67B and molded product mother mold 12 are turned over.

Next, as shown in FIG. 6(d), the mold resin mixture 68A is
After injecting into the mold 11, this mold resin mixture 68A is cured to form a core mold 68B.

Furthermore, as shown in FIG. 6(e), the molded product mother mold 12 is removed, and the cavity mold 67B and core mold 68B are used as resin molds for resin molding.

[Problem to be solved by the invention]

In conventional resin molds, metal (powder) has high thermal conductivity, but because it is surrounded by mold resin, which has lower thermal conductivity than metal, there is a limit to the thermal conductivity of the mixture of mold resin and metal. There is. As described above, since the thermal conductivity of the resin mold is poor, it takes a long time for the molding resin to solidify, resulting in a problem that the molding cycle cannot be increased.

Moreover, conventional resin molds have low strength, which limits molding pressure, poor molding dimensional accuracy, and short mold life.

It is an object of the present invention to solve the above-mentioned problems and provide a resin mold for resin molding that has fast heat dissipation and high strength.

[Means to solve the problem]

The present invention has the following means to achieve the above object.

That is, in a resin mold for resin molding, which is manufactured by placing a molded product matrix in a mold, filling the mold with mold resin, and curing the mold, carbon fibers with crystals oriented in the fiber length direction are layered in the mold resin. This is a resin mold for resin molding, characterized in that the resin mold is embedded in the resin mold.

[Effect]

By embedding carbon fibers with crystals oriented in the fiber length direction in a layered manner in a resin mold for resin molding, heat transmission through the mutually connected carbon fibers improves heat dissipation from the mold. This carbon fiber makes it a fiber-reinforced plastic and improves the strength of the mold.

Here, as shown in FIG. 5(a), if the fiber length direction (direction (a)) and crystal orientation (direction (b)) of the carbon fiber 51 having a graphite structure are misaligned, the carbon fiber 51 exhibits high thermal conductivity and high elasticity in the fiber length direction (a). On the other hand, as shown in FIG. 5(b), if the fiber length direction (A) and the crystal orientation (B) of the carbon fiber 51 do not match, the fiber length direction (A) will have low thermal conductivity and low elasticity. show. If the crystal directions are different and not oriented, the material will have low thermal conductivity and low elasticity in any direction.

〔Example〕

The present invention will be explained below based on specific examples.

FIGS. 1(a) to 1(i) are diagrams showing a method of manufacturing a resin mold for resin molding of the present invention. A carbon fiber cloth 16 as shown in FIG. 1(a) is prepared. This carbon fiber cloth 16 is made of fibers with a graphite-type crystal structure oriented in the fiber length direction.
As shown in b), the portion of this carbon fiber cloth 16 that corresponds to the molded product matrix 12 is cut off. Subsequently, this carbon fiber cloth 16 is impregnated with mold resin to form a resin-impregnated cloth 15 as shown in FIG. 1(C). The order of partially cutting the carbon fiber cloth 16 and impregnating it with the resin may be reversed. That is, the carbon fiber cloth 16 in the state shown in FIG. The resin-impregnated cloth 15 may be cured to a hardened state, and then cut as shown in FIG. 1(c).

On the other hand, as shown in FIG. 1(d), the molded product matrix 12 is placed in the mold frame 11. Next, as shown in FIG. 1(e), liquid mold resin is applied to the inner walls and surfaces of the mold frame 11 and molded product matrix 12 to form a mold resin layer 13. It is preferable that this liquid mold resin is the same resin as the mold resin impregnated into the fiber cloth 16 described above from the viewpoint of adhesion.Also, if metal powder is mixed and applied to the liquid mold resin, it will bond to the mold surface. ,
Thermal conductivity between the ends of the resin-impregnated cloth 15 that will be laminated later can be improved.

The resin-impregnated cloth 15 formed as shown in FIG. 1(C) and the liquid mold resin are laminated and completely cured as shown in FIG. 1(f) on the formwork 11 shown in FIG. 1(e). A cavity type 17 is used. Thereafter, it is turned over within the formwork 11 as shown in FIG. 1(g). Note that the resin-impregnated cloths 15 to be laminated do not necessarily need to be in a semi-cured state (although they may be laminated in an uncured state).

It is also possible to laminate only the resin-impregnated cloth 15.

The above steps of FIG. 1(e) and FIG. 1(f) are repeated on the inverted cavity mold 17 and molded product mother mold 12, and the first
A core mold 18 is formed as shown in Figure (h). Core type 1
After the mold resin No. 8 is completely cured, it is removed from the mold frame 1 as shown in FIG. 1(i), and the molded product mother mold 12 is removed to complete a resin mold for resin molding.

In order to speed up the heat dissipation of the molded resin, it is preferable that the carbon fiber cloth 16 of the car pump 1 be as close as possible to the mold surface (the part where the molded product matrix 12 has come out). In addition to increasing the cutting accuracy of the cloth 16, a method is adopted in which laser cutting is used as a cutting method, or the resin-impregnated cloth 15 impregnated with mold resin is cured to a semi-cured state to be made into a prepreg and then cut as described above.

In addition, as shown in FIG. 2, laminating prepreg resin-impregnated cloth 15 in a vacuum or curing it under heat and pressure is effective in eliminating voids and improving mold accuracy.

Further, as shown in FIG. 3, the surface of the molded product matrix 12 is covered with a carbon fiber cloth 16 and impregnated with mold resin, and then the resin-impregnated cloth 15 is laminated and cured to form a resin mold for resin molding. . The fibers of the carbon fiber cloth 16 that covers the molded product matrix 12 are preferably those whose crystal orientation is perpendicular to the fiber length direction.This will improve the thermal conductivity in the direction across the cloth and improve the heat dissipation of the molded product. It gets faster.

The lamination direction of the carbon fiber cloth 16 is not necessarily limited to one direction. For example, as shown in FIG. 4, it is an effective method from a cost perspective to replace a part of the carbon fiber cloth 16 with a glass fiber cloth or the like.

Instead of laminating the resin-impregnated cloth 15 formed of the carbon fiber cloth 16, a resin mold for resin molding having good heat dissipation can be obtained by alternately laminating the mold resin and the carbon fiber itself. In this case, the carbon fibers are aligned in parallel planes.

〔Effect of the invention〕

By adopting the configuration of the resin mold for resin molding as described above, the following effects can be obtained.

In a resin mold for resin molding, which is manufactured by placing a molded product matrix in a mold, filling the mold with mold resin, and curing it, carbon fibers with crystals oriented in the fiber length direction are embedded in the mold resin in a layered manner. By using a resin mold for resin molding that is characterized by the It also becomes. Also,
Heat conduction through carbon fibers improves thermal conductivity, resulting in shorter solidification times and faster molding cycles.

[Brief explanation of the drawing]

Figure 1 (a), (b), (c), (d), (e), (r
), (g), (h), and (i) are explanatory diagrams showing the manufacturing method of the resin mold for resin molding of the present invention, and FIGS. 2 and 3 are respectively the resin molds for resin molding of the present invention. .68B...
Core type fiber 51...Carbo

Claims (1)

[Claims] (1) In a resin mold for resin molding, which is created by arranging a molded product matrix in a mold, filling the mold with mold resin, and curing the mold,
A resin mold for resin molding characterized by a layer of carbon fiber with crystals oriented in the fiber length direction embedded in the mold resin.