JPH08257681A - Manufacture of rubber mold in lost foam pattern casting - Google Patents

Abstract

PURPOSE: To provide a method for forming a rubber mold to improve the accuracy of a wax injected article and the working efficiency in a lost foam pattern casting. CONSTITUTION: A rubber mold is prevented from being deviated by fitting the required number of rubber joint parts 3 of a solidified projecting plate rubber parts therearound, the parting agent is coated, the string-shaped rubber is packed in a core of a complicated original design pattern, and the casting is obtained by the separation method without cutting the rubber with a knife after sintered solidification.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component used for a rubber mold for taking out a wax mold and a rubber mold making method in a lost wax casting method which is widely used for jewelry and the like.

[0002]

2. Description of the Related Art When a wax mold is taken from a master mold, it is widely practiced at present to fill the periphery of the master mold and the wax injection injection mold with a raw rubber in a metal frame, After firing, the rubber is divided into two parts with a knife, the prototype part is carefully separated with a knife, the prototype is taken out, and a wax passage is provided.

[0003]

There are mainly two problems with this method. One of them is that it takes skill to cut a rubber mold with a scalpel to divide it and take out the master mold.

Another important problem is that one mold is divided into two parts, which are naturally peeled off. For this reason, inconvenience arises in storage and organization, and when applying the injection port to the wax injection port while pressing the two parts by hand or mechanical force, the positions of the two parts may shift, which makes the wax model Misalignment and large burrs are likely to occur. As a result, the work efficiency is reduced and the incidence of defective products is increased.

[0005]

[Means for Solving the Problems] The above-mentioned problem is that a convex plate-like rubber part that can be accurately joined to each other, is easily attached and detached, and is hardened so as not to separate naturally in the joined state (see FIG. 1). ) Is attached to raw rubber before firing, and a mold release agent is applied and the solution is solved.

This joint part component comprises one or more protrusions (FIG. 1). Since the material is rubber and it has elasticity, it can be shaped so that it will not come out naturally as shown in Fig. 3.

Before firing the rubber mold, the core of the prototype is pre-filled with raw rubber (FIG. 7), and after firing, the part to be peeled off is coated with a release agent and the rubber mold is fired. You can easily create a rubber mold by peeling off the inner core rubber and taking it out.

[0008]

In this way, after the rubber mold is fired, the two parts are naturally separated, and at the same time, a convex plate-like rubber component joint part is provided on one side, and a concave mark is made on the other side. The shape of this joint part has a bulge and a constriction as shown in (2), and if the number and position are appropriate, both parts can be accurately joined and detached and will not separate naturally.

[0009] Also, stretch the raw rubber into a string into the prototype,
If you apply a mold release agent and pack it in, you can easily take out the core of a prototype with a complicated design, without having to carefully separate the prototype from the rubber mold after firing, and you can make a rubber mold.

[0010]

Example: The lower half of a frame made of metal or the like is filled with raw silicone rubber, and a lantern-shaped so-called center swells with a small outlet (Fig. 4). Packed in a spiral shape (Fig. 6), cut off the raw rubber protruding from the outlet, packed the raw rubber in the ring (Fig. 7), and apply a release agent to the whole to make the part that will become the prototype core. Place the mold and the mold for the injection port (5) for wax injection, and place the required number of rubber joint parts (Fig. 1) of the cured convex on-plate rubber component around the periphery (Fig. 2). A mold release agent is applied to the entire surface, and raw silicone rubber is packed in the upper half and pressed and baked. After curing, take out the rubber from the frame such as metal, peel it off and divide it into two parts, take out the prototype, and the two parts that were divided into two parts can be accurately joined and removed by the action of the rubber joint parts (Fig. 3), and taken out. When the rubber of the prototype core is pulled out, the rubber that extends in the shape of a string (12) comes out from the small outlet where the inside of the lantern shape swells (Fig. 9), and a wax passage can be provided without using a scalpel. I can.

[0011]

As described above, the two parts thus divided can be accurately joined and removed by the action of the rubber joint part of the rubber member on the plate, and when the wax is injected into the rubber mold and the wax mold is taken out, it is displaced. It is possible to take out a wax mold without burr and without burr. In addition, even with a prototype of any complicated design, it is now possible to make rubber molds that were previously impossible by using rubber without using a scalpel, so even beginners can create rubber molds without a skilled engineer. It can be done quickly, and work efficiency and economic effect are greatly improved.

[Brief description of drawings]

FIG. 1 is a front view and a side view of the present invention.

FIG. 2 is a perspective view in which a rubber plate part of the joint part of the present invention is arranged.

FIG. 3 is a view showing an embodiment of a rubber plate part of the joint part of the present invention.

[Fig. 4] A lantern-shaped prototype with a bulging inside and a small outlet.

FIG. 5 is a cross-sectional view of a prototype having a small outlet.

FIG. 6 is a diagram in which a rubber having a small outlet with a string-shaped rubber coated with the release agent of the present invention is packed.

FIG. 7 is a diagram showing that the rubber of the present invention has been packed into a prototype.

FIG. 8 is a view of the core after the rubber has been packed.

FIG. 9 is a view of a core from which rubber has been pulled out from the master after firing the rubber.

FIG. 10 is a diagram of pulling out rubber from an injected wax mold.

[Explanation of symbols]

1 Front view of rubber plate part of joint part 2 Constricted part and side view of joint part 3 Rubber plate part of joint part is cut into one piece. 4 Rubber Mold Forming Frame 5 Gate Model 6 Prototype 7 Raw Rubber 8 Rubber Mold Recessed Part 9 After Firing 9 Rubber Mold Convex Part 10 After Firing 10 Prototype with a bulged inside and a small outlet. 11 The part where the inside of the prototype is swollen. 12 Rings and contacts with smaller outlets. 13 is a diagram in which a cord-shaped rubber coated with a release agent is packed. 14 is a diagram in which a ring portion is filled with rubber and a release agent is applied. 15 Rubber in a state where the prototype has been filled with rubber. 16 After the rubber is fired, the rubber is pulled out from the original mold and the apple is peeled off. 17 The wax mold is injected. 18 The rubber of the core is being pulled out.

Claims (2)

[Claims] 1. A component in which one or more convex plate-shaped rubber parts are integrated with a rubber mold. 2. A method for producing a rubber mold without using a knife.