JPS5877587A - Manufacture of metal mold for molding of consumable casting pattern - Google Patents

Abstract

PURPOSE:To obtain metal molds of a light weight, large cooling capacity and semipermanent durability for molding of consumable casting patterns by electrodepositing copper on matrices for electroforming which is formed to prescribed shapes. CONSTITUTION:In the case of making metal molds for molding of consumable casting pattern 1 for, for example, turbine blades, a set of upper and lower matrices 2 are formed beforehand in conformity with the upper and lower half parts which are parted and formed to upper and lower parts at the plane C-C of the pattern 1. The pattern 2 consists of a projecting part 2a (a recess with the lower half part) of the shape conforming to the upper half part of the pattern 1 and flat parts 2b which are continuous with said part and are provided on at least 3 sides of the part 2a. The matrices 2 are made of gypsum, reinforced plastics, Al castings, etc. After the projecting part 2a (or recess) and the flat parts 2b of the matrix 2 are subjected to a conducting treatment, the matrix is dipped together with a copper material for consumable electrodes into a copper plating bath and electricity is conducted between the electrode copper materials. If the copper layer on the surface of the resultant matrices 2 are stripped from the matrices 2, intended shell-like copper metal molds 3 are obtained. The top and bottom molds are joined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for forming a fugitive model used in precision casting, and relates to a novel method for manufacturing a button mold using air casting.

Conventionally, as molds for precision vanishing models that use pouring type models such as naphthalene thread model materials and urea-based model materials, stone molds or full minilam molds made by cutting the mold surface have been used. However, in the case of the right-hand/female type, the mold is bulky, has poor thermal conductivity, and has the disadvantage of being easily damaged.On the other hand, the above-mentioned disadvantages are relatively improved in the case of the aluminum type. However, it had the disadvantage of increasing processing costs.

The purpose of the present invention is to provide a new copper mold which can provide a lightweight and highly accurate female mold for fugitive model molding, and which has good thermal conductivity and can speed up the model molding cycle IV. As a new and useful method for manufacturing all molding molds, the present invention is based on a copper material for a fully consumable electrode of an electroforming mother mold formed into a predetermined shape, and a V.
The main feature is that the mold is immersed in a C plating bath and plated, and copper is deposited on the surface of the mother mold to form a shell-like copper mold.

Hereinafter, we will explain the case of manufacturing a mold for forming a fugitive model (1) for a turbine blade as shown in FIG. 1 of the present invention as an example. A master mold (2) for electroforming is prepared at t.

In other words, in the case of the model (1) which is divided into upper and lower parts on the C-0 plane in Fig. 1, the upper and lower parts of the matrix ( 2] is preformed. Figure 2 shows the shape of the upper half of #i) 5 L, te J
! 1B shows the molded matrix (2) (B-B in Figure 2)
The arrow plane corresponds to the position of the A-A arrow plane in FIG. 1). The matrix (2) has a convex portion (
2a) (If it corresponds to the lower half of the model (1), it becomes a concave part) and a flat part (2b) continuous to this convex part (2a) and provided on at least six circumferences of the convex part (2a). Consisting of

This matrix (2) is made of plaster, reinforced pufstik, aluminum stirrup or any other material.

Thus, the electric yf matrix (2) which has been molded into this predetermined shape f' has a convex part (or four parts) (2a) and a flat part (
After 2b) is subjected to a conductive treatment, it is immersed together with a copper material for a consumable electrode in a plating solution such as copper sulfate or copper borate solution, and electricity is passed between it and the electrode steel material. Then, due to the action of the battery, the copper melted from the consumable electrode is electrolytically transferred to the surface of the matrix in a layered manner, and after a certain period of time, the surface of the matrix is coated with copper layers in the order of several fins or several fins.

If the copper layer is peeled off from the m-type surface in this state, the desired shell-like pure copper mold 4 can be obtained. Figure 3 shows the upper and lower shell-shaped copper molds (3) formed in this way.
) (3) shows the assembled state. (8a) 1, ~I
jT] FIIf rl +! −”/758°n(
2) is a flange part provided on the 6th circumference of the shell-like copper mold (3), and the upper and lower shell-like copper molds (3) (3) are connected at this flange part (8a). ft. Connect with bolts, nuts, clips, etc.

According to the above manufacturing method, the desired shell-shaped copper 4
7: Molds can be made easily and accurately, but this illegally manufactured copper mold has the following remarkable advantages. The mold made according to the present invention is made of a thin shell-like material, so it can be seen visually.
Moreover, since the surface is faithfully transferred to the mother mold surface, a product with high surface precision can be obtained.In addition, since the entire mold is made of pure copper with high thermal conductivity, its cooling ability is high. I can't mention it. In other words, because of its large cooling capacity, the solidification and cooling of the model material liquid injected into the mold proceed in a short period of time, which not only shortens the model molding work time, but also allows the model material to cool on the surface of the model. This results in an extremely dense structure. By the way, this copper 4
Comparing the mold to a female plaster mold, the weight is approximately 1, the molding time is 1~↓, and 5 5 8
A'5 A semi-permanent service life can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a fugitive model, Fig. 2 is a sectional view showing an example of a master mold for electroforming, and Fig. 6 is an assembled state showing an example of a shell-shaped copper mold according to the present invention. FIG. (1)...Disappearance model, (2)...IIL type for electroforming, (3)...Copper mold. Watch applicant: Kuboguchi Iron Works Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. Dip it into a plating solution together with a copper material for an M-type consumable electrode for electroforming that has been formed into a predetermined shape, plate it, apply copper f and an electric mark on the surface of the mother mold, and put it into a shell-like copper mold. A method for manufacturing a die for evanescent model forming.