JPS63290648A - Preparation of lost wax mold - Google Patents

Abstract

PURPOSE:To widen the utilization range of a runner bar and to reduce the cost for preparing the titled mold by forming the hollow runner bar after a sprue part of a combination of many pieces of bar pieces formed to single units at the time of preparing a wax pattern cluster for a lost wax method. CONSTITUTION:The upper bar piece 2 having an adequate size and shape is first coupled into the sprue part piece 1 by inserting plural stop pins 3 into insertion holes 4 and turning the same in the prepn. of the cluster by assembling the sprue part 1 coated with wax and the runner bar having the adequate size and shape and a prescribed length to the wax pattern. the required number of short-length intermediate bar pieces 5 are then coupled to this upper bar piece 2 by fitting of inserting projection parts 7 and pinning of holes 8, 9 and are coupled to the bottom end bar piece 6 to be coupled to the wax pattern. The constitution of the runners having various shapes and the reuse thereof are enabled simply by preparing the upper bar pieces 2 having various sectional shapes as well as many pieces of the short-length intermediate bar pieces 5 and bottom end bar pieces 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the expanded application of a method using reusable runner rods during the production of lost wax model clusters in the lost wax method.

[Conventional technology]

When producing a cluster using a wax model using the lost wax method, the runner system can be replaced with a hollow runner rod with small holes coated with wax on the outer surface. According to the content of the invention disclosed in Japanese Patent Publication No. 61-3577, which can realize cost reduction, when selecting the most suitable runner rod for the product shape and appropriate casting method, it is necessary to create a new runner rod that is compatible with the product shape and appropriate casting method. There was a case.

[Problem that the invention seeks to solve]

The shape of the runner rod that is frequently used should have been determined in advance and the runner rod prepared for production, but the content of the product, which requires a large number of production personnel, has changed, so the optimal casting plan that was created accordingly There may be cases where the existing runner rod is not suitable and a new runner rod of a different shape must be prepared.

In addition, even if the shape of a runner rod is infrequently used, even if it is clear that it is effective for reducing wastewater, there is no existing optimal runner rod, so the use of that rod must be abandoned. Sometimes you don't get it.

It is an object of the present invention to solve the above-mentioned problems even if only a little, and to make the runners more widely available.

[Means for solving problems]

The above object is achieved by changing the cross-sectional shape, cross-sectional area or length of the ready-made runner with a certain degree of freedom.

In other words, the dimensions and shape of the runner system, which is the main part of the casting plan, are as follows:
This is determined by the size, shape, and required quality of the target product, and if there is not a high degree of freedom in selecting the runner,
Unfortunately, it is necessary to choose a thicker runner at the expense of the casting yield, or to prepare a wax runner by hand.

If it were possible to replace or combine a part of this ready-made runner with a unitized bar piece, it would be possible to form and use a runner of a different shape as needed, and this problem could be solved. Solvable.

Since the runner is a hollow body, the length can be changed if a runner piece with a protrusion that matches the inner cross-sectional shape is prepared separately, and the upper end of the runner If the lower end of the sprue located in the section can be replaced with a bar piece of another shape, the cross-sectional shape and area can be changed.

[Effect]

The runner has a shape that assumes a runner system, and consists of a sprue located at the top and a runner that also serves as a riser connected to the bottom. It is a hollow body in order to achieve its original purpose. This cross-sectional shape is generally circular or rectangular (including square).

In order to change the cross-sectional shape and cross-sectional area of the runner, the desired runner shape can be obtained by making the sprue part and the runner part removable.

In addition, when changing the length of the runner, the runner is constructed by mutually inserting and connecting unitized runner pieces each having a protrusion that matches the inner cross-sectional shape of the runner. ,
be free to achieve their goals.

Each coupling portion may be formed by a simple coupling method as described in the embodiment described later. This is because that part is completely adhesively fixed by the wax coated on the runner.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The runner part, which is hollow and has many small holes, consists of a sprue piece 1, an upper bar piece 2. It is composed of an intermediate piece 5 and a lower end piece 6, which are combined to form a runner.

Among them, FIG. 1 shows how the sprue piece 1 and the upper bar piece 2 are connected. A plurality of retaining pins 3 protrude from the upper end surface of the upper rod piece 2, and are inserted into the insertion hole 4 provided on the lower surface of the sprue piece 1, and then inserted into the insertion hole 4 and placed on the same surface. These pieces are coupled and fixed by slightly rotating them along a groove in the same diameter as the shaft diameter of the stopper 3 provided therein. When it is desired to change the cross-sectional shape or cross-sectional area of the runner, this can be easily achieved by replacing it with the necessary upper piece prepared separately.

Further, FIG. 2 shows how the intermediate rod piece 5 and the lower end rod piece 6 are connected. An insertion protrusion 7 whose outer shape matches the inner shape of the runner is installed on the upper part of these rod pieces, so that the lower rod piece can be easily combined with the upper rod piece. . Then, by aligning the holes 8 and 9 provided in each bar piece and inserting a pin or bolt therein, both pieces are fixed. When it is desired to change the length of the runner, this purpose can be achieved by further adding a separately prepared intermediate bar piece 5.

It is acceptable even if there is a slight gap between each joint.

This is because the wax coated on these runners in a later process completely fixes them.

[Effects of the Invention] According to the present invention, the drawbacks of the conventional method can be eliminated, and thereby the range of use of the runner can be greatly expanded.

[Brief explanation of drawings]

Figure 1 shows the state of connection near the sprue when changing the cross-sectional shape or area of the runner system, and Figure 2 shows the state of connection of runner pieces when changing the length of the runner system. FIG. 1... sprue piece.

Claims (1)

[Claims] 1. A lost wax mold that replaces the runner system with a hollow runner rod having a large number of small holes provided at appropriate intervals when producing a wax model cluster using the lost wax method. A method for manufacturing a lost wax mold, characterized in that, in order to change the cross-sectional shape, cross-sectional area, or length of the runner rod, rod pieces made by unitizing a part of the runner rod are combined.