JPH0634841U - Model board device for mold making - Google Patents

Abstract

(57) [Abstract] [Purpose] A model board device capable of easily and reliably forming a gas vent hole or a lift hole without separately providing a device for forming a gas vent hole or a lift hole in a mold. provide. [Structure] A rod-shaped model member 3 for a gas venting hole or a lifting hole is erected at a required position on the upper surface of a model plate body 2 with an elastic member 5 vertically movable at a required height.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a model plate device suitable for making a casting mold having a gas vent hole or a lift hole (hereinafter referred to as a gas vent hole).

[0002]

[Prior art and problems]

 Conventionally, a gas vent hole of a mold has been formed by making a hole in the mold with a needle or a drill after molding the mold. However, in such a conventional molding method, there are problems that a crater-like recess is formed on the back surface of the mold, the molten metal is accumulated in the recess, the yield is reduced, and the mold is damaged when a needle or the like is penetrated. For this reason, there is also a model in which a model member for a gas vent hole is erected on the upper surface of the model plate body so that the gas vent hole and the like are formed at the same time when the mold is made. There is a new problem such that the model member for the gas vent hole is bent or damaged during compression. The present invention has been made in view of the above circumstances, and it is not necessary to separately provide a device for molding a gas vent hole or the like, and the model member for the gas vent hole or the like is bent when the molding sand is compressed. The purpose is to provide a model board device that is not damaged.

[0003]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the model board device of the present invention enables a rod-shaped model member such as a gas vent hole to be moved up and down to a desired height through an elastic member at a required position on the upper surface of the model board body. It is characterized by being installed upright.

[0004]

[Action]

 The model board device configured in this way is applied to a molding machine that compresses molding sand and molds a mold. When compressed, as the squeeze plate descends, the molding sand immediately above the model member for gas vent holes, etc. is pushed to the outside of the model member for gas vent holes, etc. After coming into contact with the upper end, the gas vent hole model member descends together with the squeeze plate against the repulsive force of the elastic member. As a result, the mold is molded, and at the same time, a gas vent hole or the like penetrating the mold is formed.

[0005]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, which is a partial sectional front view, a model plate body 2 is placed on a table 1, and a rod-shaped model member 3 for a gas vent hole or the like is placed at a required position of the model plate body 2. Several books are erected. As shown in FIG. 2 which is an enlarged detailed view, the lower part of each of the model members 3 and 3 for the gas vent holes is vertically movable in the stepped hole 4a of the holder 4 screwed to the model plate body 2. It is fitted and mounted on the model plate body 2, and a compression coil spring 5 as an elastic member is interposed below the model member 3 for the gas vent hole in the stepped hole 4a of the holder 4. The blind cover 6 is screwed on, and the model members 3 and 3 for the gas venting holes and the like are elastically supported by the compression coil springs 5 and 5 so that the model members 3 and 3 can move up and down by a required height. Further, as shown in FIG. 1, a downward cylinder 7 is provided above the table 1 through a frame 8, and a squeeze plate 9 is fixed to the lower end of a piston rod 7a of the cylinder 7. I am doing it. In the figure, 10 is a casting frame, 11 a filling frame, 12 is a guide rod, and 13 is a guide bush.

In the apparatus thus configured, the molding sand S is put into the casting frame 10 and the filling frame 11, and then the cylinder 7 is extended to lower the squeeze plate 9. Then, as the squeeze plate 9 descends, the molding sand S located immediately above the gas vent hole model members 3, 3 is pushed to the outside of the gas vent hole model members 3, 3, and the squeeze plate 9 is removed. After contacting the upper ends of the gas vent hole model members 3 and 3, the gas vent hole model members 3 and 3 are lowered together with the squeeze plate 9 against the repulsive force of the compression coil springs 5 and 5. It In this way, the foundry sand S is compressed. After the compression of the foundry sand S is completed, the foundry frame 11 is lifted to perform die cutting, and the model members 3, 3 for gas vent holes and the like are returned by the compression coil springs 5, 5. As a result, at the same time when the mold is molded, a gas vent hole that penetrates the mold is formed. A rubber spring, a disc spring or the like may be used as the elastic member.

[0007]

[Effect of device]

 As is apparent from the above description, in the present invention, a rod-shaped model member for a gas vent hole or the like is erected at a required position on the upper surface of the model plate body so as to be vertically movable by a required height through an elastic member. After contacting the descending squeeze plate with the upper end of the model member for gas vent holes, etc., the model member for gas vent holes etc. descends together with the squeeze plate against the elastic member and pushes the squeeze plate. Since it escapes from the pressure, an excessive pressing force is not applied to the model member for the gas vent hole, etc. Therefore, the model member for the gas vent hole is excellent in that it is not plastically deformed or damaged. It has a practical effect.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of a portion A of FIG.

[Explanation of symbols]

 2 Model plate body 3 Model member for gas vent holes 5 Compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A model plate main body 2 and a rod-shaped model for a gas vent hole or a lift hole which is vertically installed at a predetermined position on the upper surface of the model plate main body 2 so as to be vertically movable by a predetermined height via an elastic member 5. A model board device for mold making, comprising: a member 3;