JPS6343180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a wax tree using the lost wax method.

In the lost wax method, an integral structure of a sprue model and a plurality of product models is called a wax tree. Conventionally, this wax tree has generally been manufactured according to the following process.

(A) [See Figure 1] First, as shown in Figure A, wax 2 is poured into the mold 1 for molding the product model.
A product model 3 as shown in Figure B is molded. 3a is a gate (weir) part, and the remaining parts correspond to the actual product.

(B) [See Figure 2] Meanwhile, in parallel with the process in (A), wax 2 is poured into the mold 4 for molding the sprue model as shown in Figure A to form the sprue model 5 as shown in Figure B. do. However, in this case, the sprue model 5 also includes the runner part.

(C) [See Figure 3] Next, the product models 3 obtained in step (A) are bonded one by one to predetermined positions of the sprue model 5 obtained in step (B) by brazing or adhesive.

However, in the conventional method as above,
To make one wax tree, the above (A)
This method requires three independent steps from (C) to (C), and the process (C) in particular relies on the manual labor of the operator and is time-consuming, resulting in poor work efficiency. In addition, in the process (C), because it was done manually, variations in bonding positions and bonding defects were likely to occur, which tended to result in unstable quality, which sometimes affected quality control in subsequent processes.

The present invention has been made in consideration of the above points, and
The purpose of this is to increase work efficiency by omitting the joining process as mentioned in (C) above, and to improve the accuracy of the joint between the product model and sprue model to produce a wax tree with stable quality. ,It is in.

Hereinafter, the content of the present invention will be explained with reference to FIGS. 4 to 6.

The present invention is characterized in that the wax tree is manufactured according to the following steps.

(a) First, as in the conventional case, as shown in Figure 4A, wax 2 is poured into the mold 1 for molding the product model,
A plurality of product models 3 having gate portions 3a (portions indicated by check patterns in the figure) as shown in FIG.

(b) Next, as shown in FIG. 5, a plurality of product models 3 are set in a mold 6 for forming sprue models with the gate portions 3a protruding into the molten wax injection space 6a. In this state, as shown in FIG. 6, wax 2 is poured into the injection space 6a.
is poured to form a sprue model, thereby producing a wax tree in which the product model 3 and the sprue model are integrated.

The mold 6 for forming the sprue model is provided with a predetermined cavity 6b for setting the product model 3 so as to be located around the wax injection space 6a. By simply inserting the product model 3, the mounting position of the product model 3 can be determined. Furthermore, the fitting part between the gate part 3a of the product model 3 and the mold 6 is designed so that there is no gap, so that when the molten wax 2 is poured into the wax injection space 6a of the mold, leakage occurs from that part. It is now possible to prevent this from occurring.

According to the present invention as described above, the conventional joining process of joining the product model to the sprue model one by one can be omitted, and work efficiency can be improved.
Further, positioning can be performed simply by setting the product model in the sprue model forming mold, so the positioning work is efficient and a wax tree with high precision can be manufactured. Furthermore, since the sprue model is molded with the gate part of the product model protruding into the wax injection space of the mold for molding the sprue model, the joint strength of both models is high and the precision of the joint part is high. It is possible to produce wax trees with stable quality.

[Brief explanation of drawings]

Figures 1 to 3 show each step in the conventional method. Figure 1A is a side sectional view showing the product model being molded, Figure 1B is a perspective view of the product model, and Figure 1B is a perspective view of the product model. Figure 2A is a side sectional view showing the sprue model being molded, Figure 2B is a plan view of the sprue model, Figure 3 is a diagram showing the product model being joined to the sprue model, and Figure 4 6 to 6 are diagrams for explaining the present invention, in which FIG. 4A is a diagram showing a state in which a product model is being molded, FIG. 4B is a perspective view of the product model,
FIG. 5 is a plan view showing a product model set in a mold for forming a sprue model, and FIG. 6 is an enlarged side sectional view of the part where the product model is assembled into the mold. 3...Product model, 3a...Gate part, 6...
Mold for forming sprue model, 6a... molten wax injection space, 6b... empty space.

Claims (1)

[Claims] 1. In a method for manufacturing a wax tree in which a sprue model and a plurality of product models are integrated, a product model is first molded, and then the preformed product model is set in a mold for molding the sprue model. The product model is set in the cavity with the gate portion protruding into the molten wax injection space of the mold, and a sprue model is molded in this state, thereby producing an integrated wax tree. A method for producing a wax tree using the lost wax method.