JP5003574B2 - Backup mold structure used in mold manufacturing method - Google Patents

Description

The present invention relates to a back-up mold structure used in a mold manufacturing method. More specifically, the present invention can stably manufacture a mold composed of high-precision gypsum, ceramic, metal material, etc., and mold quality accuracy. It is related with the structure of the backup type used for the casting_mold | template manufacturing method which can raise | lift.

  Conventionally, as a mold manufacturing method, for example, rubber is obtained by molding and curing with a liquid rubber material (such as silicon rubber) for molding based on a master model (master mold) formed of a heat-resistant resin material. After the mold is formed and the rubber mold is installed and fixed on the backup mold that constitutes the mold frame, the mold is manufactured by pouring a mold material such as gypsum or ceramic onto the rubber mold in the mold frame. A method of manufacturing a casting (mold) of aluminum or the like using a metal is performed (for example, see Patent Document 1).

  By the way, in recent years, when a rubber mold is formed from a master mold, the rubber mold is thinly formed in order to reduce the rubber material and prevent gypsum destruction when releasing the rubber mold. However, if the rubber mold is formed thin, it is necessary to incorporate the backup mold that constitutes the mold frame for fixing the rubber mold in a stable state.

  After the rubber mold is installed in the backup mold, the back side of the rubber mold is in close contact with the surface of the backup mold, but depending on the type of mold, a large number of siping blades can be inserted into the surface of the rubber mold, In addition, due to the influence of deformation and shrinkage during storage of the rubber mold, there is a problem that the center part of the rubber mold may float when the gypsum mold is taken, which adversely affects the accuracy of the gypsum mold. In particular, when there is a dimensional error of 0.1 mm or more, it may be a defective product of a plaster mold.

  Therefore, in order to prevent the rubber mold from being lifted, a wedge-shaped protrusion 3 is formed on the back side of the center of the rubber mold 2 constituting the mold frame 1 as shown in FIGS. An engaging recess 5 that engages with the wedge-shaped protrusion 3 is formed on the surface, and when filling the gypsum material of the gypsum mold W, the rubber mold 2 is lifted by engaging the wedge-shaped protrusion 3 with the engaging recess 5. Methods for preventing it have been proposed.

  However, such a method can prevent the rubber mold 2 from being lifted, but as shown in FIG. 12, when the gypsum mold W is released, a rubber mold is used to prevent a part of the gypsum mold W from being damaged. 2 is required to be peeled off from the gypsum mold W while being deformed as indicated by an arrow X. For this purpose, the backup mold 4 must be removed from the rubber mold 2 in advance.

As described above, in a state in which the wedge-shaped protrusion 3 and the engaging recess 5 are engaged, the separation between the backup mold 4 and the rubber mold 2 is not simplified, and the backup mold 4 and the rubber mold 2 are not assembled. Since the mold release is repeated, there is a problem that workability and productivity cannot be improved in the configuration in which the wedge-shaped protrusion 3 and the engagement recess 5 are engaged.
Japanese Patent Laid-Open No. 5-177298

The present invention pays attention to such conventional problems, and by enabling the rubber mold to be installed and fixed in a stable state to the backup mold, the workability and productivity are improved, and a high-precision gypsum mold is stably formed. it is an object to provide a structure of a backup type used to mold manufacturing method can be fabricated to.

In order to achieve the above object, the present invention , when a mold is manufactured by pouring a mold material onto the rubber mold in the mold mold frame after the rubber mold is installed and fixed on the backup mold constituting the mold mold frame , In a backup mold structure used in a mold manufacturing method for installing and fixing a rubber mold, the mold material is one selected from gypsum and ceramic , and a vacuum means is provided on a surface that contacts the rubber mold of the backup mold A decompression passage and / or a plurality of decompression holes connected to the rubber passage, the decompression passage is formed in a communication groove that uniformly vacuums a contact surface of the rubber mold, and the backup mold has a predetermined diameter, The gist of the present invention is that it is configured to be connected to a vacuum means, and a valve rod or a lid that can be attached and detached at the time of manufacture is provided in the pressure reducing passage and the pressure reducing hole.

  With this configuration, the rubber mold can be installed and fixed in a stable state to the backup mold, the workability and productivity of the mold manufacturing operation can be improved, and a highly accurate gypsum mold can be stably manufactured. Is.

The structure of the backup mold used in the mold manufacturing method of the present invention is that the rubber mold is set and fixed on the backup mold constituting the mold mold frame, and then the mold material is poured onto the rubber mold in the mold mold frame. when manufacturing, the structure of the backup type used to mold manufacturing method of installing fixing the rubber mold, the mold material, gypsum, using one selected from ceramic, contact with the rubber type of the backup type A pressure reducing passage and / or a plurality of pressure reducing holes connected to the vacuum means are formed on the surface, the pressure reducing passage is formed in a communication groove that uniformly vacuums the surface in contact with the rubber mold, and the backup mold has a predetermined Since it has a diameter and is configured to be connected to a vacuum means, and the pressure reducing passage and the pressure reducing hole are provided with a valve rod or a lid that can be attached and detached at the time of manufacture, the path is closed when molding a rubber mold. When gypsum mold removal is by opening the path, it is possible to back up type sharing in the rubber-type take-up step and the gypsum mold up process, to facilitate the storage operations of the backup type, also is economical.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.

  FIG. 1 is a perspective view seen from the surface side of a backup mold 4 showing the first embodiment of the present invention, and FIG. 2 is a perspective view seen from the surface side of the backup mold 4 showing the second embodiment of the present invention. The backup mold 4 shown in the first embodiment has a predetermined diameter φ (depending on the size of the backup mold 4) on the surface 4 a that contacts the rubber mold 2 of the backup mold 4. However, a plurality of decompression holes 6 penetrating in the depth direction at 5 to 20 mm are formed.

  In the second embodiment shown in FIG. 2, the pressure reducing passages 7 are formed on the surface 4a of the backup mold 4 that contacts the rubber mold 2 at predetermined intervals and in a grid pattern with a predetermined depth. A part of the decompression passage 7 is also provided with a decompression hole 6a connected to a decompression suction means (not shown) such as a vacuum pump.

  As shown in FIGS. 3 and 4, the decompression holes 6 and 6 a are formed with a recess 8 having a large diameter on the surface 4 a side in contact with the rubber mold 2, and penetrate through the center of the recess 8 in the depth direction. Pressure reducing holes 6 and 6a are formed. The decompression holes 6 and 6a are connected to a decompression suction means (not shown) such as a vacuum pump on the back surface side 4b of the backup mold 4, and the decompression value of this embodiment is that the rubber mold 2 is pressed by a pressure of -10 KPa to -50 KPa. Adsorbed and held.

  As shown in FIGS. 3 and 4, when the rubber mold 2 is molded, the pressure reducing holes 6, 6 a are closed in the recesses 8 of the pressure reducing holes 6, 6 a, and the rubber mold 2 is used to form slurry. When the gypsum mold W is manufactured by filling the gypsum material, a valve rod 9a or a lid 9 that opens the decompression holes 6 and 6a is provided, and a rubber mold 2 molding process and a backup mold in the gypsum mold W molding process. 4 can be shared.

  That is, at the time of the molding process of the rubber mold 2, as shown in FIGS. 3 and 4, the lid 9 is fitted into the recess 8 of the decompression holes 6 and 6a to close the decompression holes 6 and 6a. The rubber material is prevented from flowing into the decompression holes 6 and 6a, and during the molding process of the gypsum mold W, the lid 9 is removed to open the decompression holes 6 and 6a, and the decompression force from the decompression suction means By adsorbing and holding the rubber mold 2 on the surface 4a that contacts the rubber mold 2 of the backup mold 4, a highly accurate gypsum mold can be stably manufactured.

  5 and 6 show an embodiment in which a valve stem 9a is used in place of the lid 9 described above. The pressure reducing passage 7 formed in a lattice shape is used in the molding process of the rubber mold 2 and the plaster mold W. The structure which attaches and detaches the valve stem 9a at the time of the mold making process is shown. By constructing as described above, the rubber mold 2 can be installed and fixed in a stable state to the backup mold 4, the workability and productivity can be improved, and a highly accurate gypsum mold can be stably manufactured. It is.

  Further, a pressure reducing passage 7 and / or a plurality of pressure reducing holes 6, 6 a connected to a pressure reducing suction means such as a vacuum pump are formed on the surface 4 a of the backup die 4 that contacts the rubber die 2. 6a is provided with a removable valve stem 9a or lid 9 at the time of manufacture, so that the path is closed during the molding process of the rubber mold 2, and the path is opened during the molding process of the gypsum mold W. The backup mold 4 can be shared in the mold 2 molding process and the gypsum mold W mold molding process, and the backup mold 4 can be stored easily and economically.

  FIGS. 7 and 8 and FIGS. 9 and 10 show a case where a master mold or a gypsum mold is manufactured by installing and fixing the rubber mold 2 to the conventional backup mold 4, and the rubber mold 2 is used for the backup mold 4 of the present invention. FIG. 2 is an explanatory diagram comparing the case where a master mold or a gypsum mold is manufactured by fixing and fixing a path during the molding process of the rubber mold 2 as in the embodiment of the present invention. By opening the path during the mold making process, a highly accurate gypsum mold W can be produced without generating protrusions 2x on the bottom surface of the produced rubber mold 2 or damaging the gypsum mold W. .

It is the perspective view seen from the surface side of the backup type | mold 4 which shows 1st Embodiment of this invention. It is the perspective view seen from the surface side of the backup type | mold 4 which shows 2nd Embodiment of this invention. It is a perspective view at the time of mounting | wearing with the cover to the recessed part of the decompression hole formed in the backup type | mold. It is sectional drawing at the time of mounting | wearing with the cover to the recessed part of the decompression hole formed in the backup type | mold. It is a perspective view of the decompression passage arranged in the shape of a lattice formed in the backup type. It is sectional drawing at the time of mounting | wearing with a valve rod in the grid | lattice-like decompression passage formed in the backup type. It is sectional explanatory drawing in the case of manufacturing a master type | mold or a gypsum type | mold by installing and fixing a rubber type | mold to the conventional backup type | mold. FIG. 8 is an explanatory cross-sectional view of a process of removing a backup mold from the rubber mold of FIG. 7. FIG. 8 is a cross-sectional explanatory diagram in the case where a master mold or a gypsum mold is manufactured by installing and fixing a rubber mold to the backup mold of the present invention with respect to the conventional example of FIG. FIG. 10 is a cross-sectional explanatory diagram of a process of removing the backup mold from the rubber mold of FIG. 9. It is sectional drawing of the process of installing and fixing a rubber mold to the conventional backup mold, and manufacturing a gypsum mold. It is explanatory drawing of the process of removing a rubber mold from the conventional gypsum mold.

1 Mold frame 2 Rubber mold 3 Protrusion 4 Backup type 4a Abutting surface 4b Back side 5 Engaging recess 6a, 6b Decompression hole 7 Pressure reducing passage 8 Recess 9 Lid 9a Valve stem W Plaster mold

Claims (1)

A mold manufacturing method in which a rubber mold is installed and fixed when a mold material is poured into a rubber mold in a mold mold frame after the rubber mold is installed and fixed on a backup mold that constitutes the mold mold frame. In the backup type structure used,
The mold material is one selected from gypsum and ceramic, and a decompression passage and / or a plurality of decompression holes connected to a vacuum means are formed on a surface in contact with the backup mold, and the decompression The passage is formed in a communication groove that uniformly vacuums the surface of the rubber mold that abuts, and the backup mold has a predetermined diameter and is configured to be connected to a vacuum means. A back-up type structure used in a mold manufacturing method, characterized in that a valve stem or a lid that can be attached and detached at the time of manufacture is provided.

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