JP2743749B2 - Mold making method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a molding die, and more particularly to a method of forming a first die and a second die by shaving a liquid-absorbing material obtained by curing a self-hardening liquid material. In order to produce a mold consisting of split molds that define a product-shaped molding space between the two molds, a mold that can easily and reliably produce a mold with good mold matching accuracy Related to the production method.

[0002]

2. Description of the Related Art A water-absorbing mold formed by hardening a self-hardening liquid material such as gypsum slurry, comprising a first mold and a second mold which define a molding space for a product shape by matching. Using a split mold, a slurry (a slurry obtained by converting a powdery and granular clay for forming into a mud) is injected into a molding space formed in the mold, and an unnecessary liquid (eg, water) in the slurry is removed. A slurry casting method of infiltrating into a molding die and depositing the remaining granular kneaded material on the inner surface of the molding die, and thereafter separating the first mold and the second mold and taking out the deposit. Is widely used today as a method for producing various sanitary wares.

Conventionally, a molding die used in such a slurry casting method is manufactured by shaving a gypsum block and processing the first mold and the second mold separately. .

[0004]

In the above-mentioned conventional method for manufacturing a molding die, the first die and the second die are separately cut and machined, so that the molds of the split molds produced cannot be properly matched. However, there is a drawback in that a delicate correction process by a skilled worker is required as post-processing.

[0005] In addition, when shaping each mold, for example, after shaving the front side of the mold, when shaving the back side, the gypsum block is turned over on the table. Causes the mold surface to shift.
The “molding surface” may be referred to as a “front surface”. ) And the back surface (hereinafter, the “surface opposite to the molding surface” may be referred to as the “back surface”).

The present invention solves the above-mentioned conventional problems, and forms a mold comprising a first mold and a second mold by shaving a liquid-absorbing material obtained by curing a self-hardening liquid material. In order to manufacture a mold, it is possible to easily and reliably produce a mold with good mold matching accuracy and good positional accuracy between the front and back surfaces of the mold without the need for manual correction work by skilled workers. An object of the present invention is to provide a method of manufacturing a mold that can be manufactured.

[0007]

A method of manufacturing a molding die according to the present invention is a method of manufacturing a molding die by shaving a liquid-absorbing material obtained by curing a self-hardening liquid material. The molding die molds the first die and the second die,
In a method of manufacturing a mold that is a split mold that defines a molding space of a product shape between both molds, a first block made of the liquid-absorbent material is cut out and processed into the first mold. A step of forming a cutting body by combining product shapes;
A step of applying a release agent to the product shape portion of the cutting body and the surrounding portion thereof, and contacting and placing the self-hardening liquid on the product shape portion of the cutting body and the surrounding portion thereof, and curing the self-hardening liquid. Forming a second block having a size that includes the second mold, and cutting the second block to form a second block having a size matched to the first mold. Forming a second mold, separating the second mold from the cutting body, and shaving off the liquid-absorbent material from the cutting body by an amount corresponding to the product shape. And

[0008]

According to the method of manufacturing a molding die of the present invention, a first block made of a liquid-absorbing material is cut out and processed.
On the cutting body obtained by combining the product shape with the first mold, the second block obtained by supplying and hardening the self-hardening liquid material was cut out and processed to match the first mold. Make a second mold in state. For this reason, the molding surface of the second die obtained follows the product shape of the cutting body, and has a shape that can be accurately matched with the first die.

The first mold can be manufactured with high shape accuracy by shaving off the liquid-absorbing material from the cut body by the shape of the product.

In manufacturing such first and second dies, there is no need to reverse or move the liquid-absorbing material to be shaved, so that there is no risk of displacement and the surface of each of the dies is removed. The positional accuracy with the back surface is extremely good.

When the first mold is cut, a mold release agent is attached to the cut body, so that the second mold manufactured on the cut body can be easily separated from the cut body. Can be.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view for explaining a method of manufacturing a mold according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the formed mold.

In the method of this embodiment, first, FIG.
As shown in (a) and (b), a block 1 made of a cured body of gypsum is cut into a shape indicated by a broken line A so as to follow the shape of the back surface of a first mold to be manufactured, and a base 2 is manufactured.

Next, after a release agent is applied to the surface 2A of the base 2, a weir (not shown) is provided on the base 2 to supply gypsum slurry, and the gypsum slurry is hardened.
As shown in (c), a first block 3 is formed on a base 2 and this first block is cut into a shape shown by a broken line B so as to follow a shape obtained by combining a first mold and a product shape. Then, as shown in FIG. 1D, a cutting body 4 is manufactured on the base 2.

Next, after a release agent is applied to the surface 4A of the cutting body 4, a gypsum slurry is supplied by providing a weir (not shown), and the gypsum slurry is hardened, as shown in FIG. 1 (e). A second block 5 is formed on the cutting body 4 and the second block 5
Block 5 of the second mold so as to follow the shape of the back surface of the second mold,
As shown in FIG.
The second mold 6 is manufactured on the cutting body 4.

After manufacturing the second mold 6, the second mold 6 is separated from the cutting body 4. At this time, since the release agent is applied to the surface of the cutting body 4, the second mold 6 can be easily separated.

Next, as shown in FIG.
The block is scraped off at the position of the broken line D by an amount corresponding to the product shape from, and the first mold 7 shown in FIG.

Then, the first die 7 is separated from the base 2 and the previously manufactured second die 6 is matched to form a molding space 8 having a desired product shape as shown in FIG. A defined mold can be obtained.

Among the obtained molding dies, the surface 6A of the second die 6 is formed on the cutting body 4 having a shape obtained by combining the first die and the product shape in advance. From the second mold 6 in a state of being matched with the first mold.
Excellent precision as a molding surface. Also, since the surface 7A of the second mold 7 is formed by cutting in a fixed state, the shape accuracy is extremely high. Moreover, the second mold 6
Since the mold mating surface 6B is hardened on the mold mating surface 7B of the first mold 7, the mold mating accuracy of the two mold mating surfaces 6B, 7B is also good.

Furthermore, since the back surface 6C of the second mold 6 is formed by cutting the second mold 6 with the manufacturing block 5 fixed, the positioning accuracy with respect to the front surface 6A is excellent.

Similarly, since the front surface 7A of the first mold 7 is formed by cutting the production cutting body 4 of the first mold 7 in a fixed state, the position between the front surface 7A and the back surface 7C is determined. Good accuracy.

According to the mold thus obtained,
By casting the slurry into the molding space 8, a product having excellent shape accuracy can be manufactured with a high yield.

Although the above embodiment relates to the production of a gypsum mold, a resin mold such as a cold-setting resin can be produced in the same manner.

[0025]

As described above in detail, according to the method of manufacturing a molding die of the present invention, the precision of the shape, the accuracy of the mold matching,
A mold having extremely good positional accuracy can be manufactured easily, efficiently and reliably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a method of manufacturing a mold according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a manufactured mold.

[Explanation of symbols]

 2 Base 3 First block 4 Cutting body 5 Second block 6 Second die 7 First die 8 Molding space

Claims (1)

(57) [Claims] 1. A method of manufacturing a mold by shaving a liquid-absorbing material obtained by curing a self-hardening liquid material, the mold comprising a first mold and a second mold. In the method for manufacturing a mold that is a split mold that defines a molding space of a product shape between both molds, a first block made of the liquid-absorbent material is cut out and processed. A step of forming a cutting body obtained by combining the product shape with the first mold; a step of attaching a release agent to the product shape portion of the cutting body and a peripheral portion thereof; Contacting a self-hardening liquid with the surrounding portion and curing the self-hardening liquid, thereby forming a second block sized to include the second mold; and shaving the second block. By performing the stamping process, the first mold is matched with the first mold. Forming a second mold in a cut state, a step of separating the second mold from the cutting body, and a step of shaving off the liquid-absorbent material by the product shape from the cutting body. A method for manufacturing a mold, characterized in that: