JPH06218492A - Shell mold - Google Patents

Abstract

PURPOSE:To obtain a shell mold which can form a cavity by joining both molds with adhesive. CONSTITUTION:In the shell mold 1 forming the cavity 4 by joining two molds 2, 3, projecting parts 6 and recessed parts 7 for joining molds are provided on the joining surface of respective molds 2, 3 and the groove width in this recessed part 7 is made slightly larger than the width of the projecting part 6 to form a gap 8 at the time of fitting. Then the gap 8 is formed at the side far from the cavity 4 or a runner 5, and in the joining surface of the projecting part 6 and the recessed part 7 where the gap 8 is not formed, small grooves 9 are formed along the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an improvement in a shell mold in which two molds are bonded with an adhesive to form a cavity.

[0002]

2. Description of the Related Art In a shell mold in which two molds are joined to each other to form a cavity, a pair of recesses and protrusions for joining are formed in each of the molds, and these recesses and protrusions are fitted together and, for example, recesses are formed. An adhesive is applied to the side so that both are adhered.

[0003]

By the way, as described above, when the concave portion and the convex portion of the two molds are joined by an adhesive,
If the amount of adhesive applied is small, the bonding condition will not improve, so there is a tendency to apply a relatively large amount of adhesive, and therefore the adhesive will squeeze out and enter the runner or cavity along the mating surfaces of the two molds. There is. In such a case, unless this adhesive is wiped off, there is a problem that it mixes with the molten metal during casting and causes defective casting.

[0004]

In order to solve the above-mentioned problems, the present invention is designed so that the width of the concave portion of each mold is made slightly larger than the width of the convex portion to form a void on the one wall surface side during fitting, A small groove was formed on the wall surface of the concave or convex portion of each mold on the side opposite to the side where the void is formed, substantially along the longitudinal direction of the concave or convex portion.

[0005]

The overflow of the adhesive is accommodated by the void formed when the recess and the protrusion of each mold are fitted together, and is formed along the longitudinal direction of the wall surface of the recess or protrusion facing the void. The small grooves prevent excess adhesive from entering the runner or cavity.

[0006]

Embodiments of the shell mold of the present invention will be described below with reference to the accompanying drawings. 1 is a configuration diagram of a shell mold according to the present invention, FIG. 2 is a top view of the shell mold, FIG. 3 is an enlarged sectional view of an essential part of the shell mold, and FIG. 4 is an enlarged part of the shell mold in a joined state. FIG.

For example, in a shell mold 1 for casting a round part, two molds 2 and 3 are joined to form a cavity 4 for the round part, and a runner 5 for pouring the cavity 4 therein. Is formed.

Then, on the mating surfaces of the molds 2 and 3, a convex portion 6 which can be fitted to each other at a place other than the cavity 4 and the runner 5 is provided.
And a concave portion 7 are formed, that is, as shown in FIG. 3, a convex portion 6 is provided for the mold 2 and a concave portion 7 is provided for the mold 3 to form a strip shape as shown in FIG.

Further, in this case, the groove width of the concave portion 7 is made slightly larger than the width of the convex portion 6 so that the void 8 is formed on one wall surface side at the time of fitting, as shown in FIG. As shown in FIG. 1, the direction of the gap 8 is far from the cavity 4 or the runner 5. In the close direction, the convex portion 6 and the concave portion 7 are in close contact with each other to join the molds 2 and 3 without rattling. You can do it.

A small groove 9 is formed along the longitudinal direction of the concave portion 7 on the wall surface of the concave portion 7 of the mold 3 on the side where the void 8 is not formed. That is, the small groove 9 is formed on the side close to the cavity 4, and is formed in the middle of the joint surface where the convex portion 6 and the concave portion 7 closely contact each other. Although the small groove 9 is formed on the wall surface of the concave portion 7 of the mold 3 in the embodiment, it may be formed on the wall surface of the convex portion 6 of the mold 2 on the opposite side.

When the molds 2 and 3 of the shell mold 1 are joined together, the adhesive 10 is applied to the bottom surface of the recess 7 of the mold 3 as shown in FIG. The convex portion 6 is fitted into the concave portion 7 of the mold 3 and the both are joined by the adhesive 10.

At this time, as shown in FIG. 4, a gap 8 is formed between the convex portion 6 of the mold 2 and the concave portion 7 of the mold 3 on the side of one wall surface. Since a small groove 9 is formed on the wall surface of the recess 7 opposite to the void 8 while being accommodated in the inside, the adhesive 10 that is about to enter the cavity 4 or the runner 5 is formed in the small groove 9
Is blocked by.

Since the adhesive 10 is prevented from entering the runner 5 and the cavity 4 in this manner, a good product can be cast and it is not necessary to strictly control the amount of the adhesive applied. Work efficiency is improved.

[0014]

As described above, according to the present invention, 2
Since a gap is formed when the concavo-convex parts of the two molds are fitted together, and a small groove is formed along the wall surface of the concave or convex part facing the gap along the substantially longitudinal direction, the adhesive may enter the runner or the cavity. Can be prevented, a good product can be obtained, and work efficiency is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a shell mold according to the present invention.

FIG. 2 is a top view of the shell mold.

FIG. 3 is an enlarged sectional view of an essential part of the shell mold.

FIG. 4 is an enlarged sectional view of an essential part of the shell mold in a joined state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shell mold 2, 3 mold 4 cavity 5 runner 6 convex part 7 concave part 8 void 9 small groove 10 adhesive

Claims (1)

[Claims] 1. A shell mold in which two molds are joined to each other to form a cavity and each of the molds has an uneven portion for joining, and the width of the concave portion of each mold is slightly larger than the width of the convex portion. When forming and forming a gap on one wall surface side at the time of fitting, the longitudinal direction of the concave portion or the convex portion on the wall surface of the concave portion or the convex portion of each mold opposite to the side where the gap is formed. A shell mold characterized in that a small groove is formed substantially along the groove.