JP2699048B2 - Mold manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention, when injected into adult forms Thus forming a molded article made of a synthetic resin, to a method of manufacturing the mold comprising a female mold and a male mold to be used at the time of molding.

[0002]

2. Description of the Related Art Conventionally, in manufacturing such a mold, FIG.
As shown in (1), a wooden master model 1 having the outer shape of a molded product to be molded by a molding die is manufactured.

The gypsum 4 is poured by placing the master model 1 in the mold 2 and after the gypsum 4 is cured, the gypsum 4 is released, and a mold surface 5a on which the front side of the master model 1 is transferred.
To form a gypsum mold 5 having

Thereafter, a sheet wax 7 is adhered to the mold surface 5a of the gypsum mold 5 by the thickness of the molded product,
The gypsum mold 5 is placed in the mold 3 and the sheet wax 7
Gypsum 4 is poured into the side to which is adhered, and after the gypsum 4 is cured, the gypsum 4 is released, and the surface side of the sheet wax 7 is replaced with the mold surface 6a.
To form a male gypsum mold 6 transferred to the mold.

[0005] Then, the gypsum mold 5 and the male gypsum mold 6 from which the sheet wax 7 has been peeled off are arranged in predetermined molds 8 and 9,
The sand 10 is injected to form the male sand mold 11 and the female sand mold 12.

[0006] Thereafter, the male sand mold 11 and the female sand mold 12 are inverted, and a molten metal material 13 such as a zinc alloy is poured, hardened and released from the mold. The female mold 15 and the male mold 16 of the mold 14 were manufactured.

[0007]

However, before the female mold 15 and the male mold 16 of the conventional mold 14 are manufactured, the gypsum molds 5 and 6 are formed from the master model 1, and the gypsum molds 5 and 6 are further formed.
・ Sand molds 11 and 12 are formed from 6 and then female mold 15 and male mold 16 are manufactured from those sand molds 11 and 12. The number of days to ship had increased significantly.

The present invention solves the above-mentioned problems, and a female mold and a male mold can be easily manufactured, and the number of steps from the production of a master model to the molding of a molded product can be significantly reduced. It is an object of the present invention to provide a method for producing the same.

[0009]

SUMMARY OF THE INVENTION A manufacturing method according to the present invention is a method for manufacturing a molding die including a female die and a male die for injection- molding a molded product, wherein the molding die is disposed in a mold. A heat-hardening mold for heat-resistant molds
A moldable resin material, injecting the curable resin material, curing, releasing the mold, and forming the female mold by transferring the surface side of the master model to a mold surface; and forming the molded product on the mold surface of the female mold. Along with the thickness dimension of, the sheet material is adhered, the female mold is placed in a mold, and a thermosetting resin material having heat resistance for molding is placed on the side where the sheet material is adhered. Injecting, curing, releasing, the male mold forming step of forming the male mold by transferring the surface side of the sheet material to the mold surface, after the mold releasing step of the male mold forming step, from the female mold to the sheet It is manufactured through a sheet material processing step of stripping the material.

[0010]

In the manufacturing method according to the present invention, the female mold and the male mold are used as resin molds, and the female mold itself is directly transferred from the master model to form the male mold. It is formed by transferring the sheet material surface where the sheet material is adhered to the mold surface in a dimension corresponding to the thickness of the molded product.

[0011] Therefore, since it is not necessary to transfer to a gypsum mold or a sand mold as in the prior art, a female mold and a male mold can be easily manufactured, and the man-hour from when the master model is manufactured to when the molded article is formed is reduced. It can be significantly reduced.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

Mold 24 manufactured in the embodiment (see FIG. 2)
Is formed by injection molding a panel P of an automobile console box as shown in FIG. 3, and this panel P is formed of ABS resin.

The molding die 24 includes a female die 25 and a male die 26. The female die 25 and the male die 26
The molded article P is formed of a thermosetting resin for a molding die such as an epoxy resin having sufficient durability at the molding temperature.

The production of the molding die 24 will be described below.
The manufacturing process of the mold 24 includes a female forming process, a male forming process, a sheet material processing process, and a finishing process.

In the female mold forming step, as shown in FIG. 2, a wooden master model 1 is placed in a mold frame 2, and a heat-resistant resin material 2 for a molding die is provided on the front side of the master model 1.
3 is injected, cured, and released to form a female mold 25 in which the front side of the master model 1 is transferred to the mold surface 50.

Note that a release agent is applied to the master model 1 in advance. Also, the female mold 25 released (released)
A heat treatment of stepwise heating at a predetermined temperature is performed so as to be completely cured, and to have a predetermined heat resistance.

Incidentally, the resin material 23 used in the embodiment is used.
Is an epoxy resin material having a reduced shrinkage, and is trade name “MYX-04” (manufactured by Mitsubishi Yuka Corporation).

Then, in the male mold forming step, as shown in FIG.
Then, the sheet wax 7 as a sheet material is stuck, and the female mold 25 is arranged in the mold 3. Thereafter, the resin material 23 is injected into the side where the sheet wax 7 is adhered,
After curing, the mold release is performed, and the surface side of the sheet wax 7 is
The male mold 26 transferred to 0 is formed.

When the sheet wax 7 is applied,
When the reinforcing ribs L are provided on the back surface side of the molded product P, the rib plate 30 is fixed to the outer surface of the sheet wax 7 attached thereto using an adhesive or the like.

The released (removed) male mold 26 is subjected to a heat treatment in which it is heated stepwise at a predetermined temperature so as to be completely cured so as to have a predetermined heat resistance.

Thereafter, in a sheet material processing step, as shown in FIG.
And the plate material 30 for ribs are peeled off.

In the finishing step, the female mold 25 and the male mold 2
6 and the female mold 25 and the male mold 26 are clamped, and the mold faces 50 and 60 and the split faces 25a and 26a are adjusted and finished to form a sprue (not shown). -The gate, the ejector pin 27, etc. are provided.

As shown in FIG. 2, the molding die 24 of the embodiment is disposed in the mold bases 28 and 29 of the injection molding machine.

When the molding die 24 is disposed in the mold bases 28 and 29 and the molding machine is operated, the molded product P
Can be molded.

In the manufacturing method of the embodiment, the female mold 25 itself and the male mold 26 of the molding die 24 are used as resin molds, and the female mold 25 itself is directly transferred from the master model 1 to form the male mold 26. The surface of the sheet wax 7 adhered to the mold surface 50 of the mold 25 with a dimension corresponding to the thickness t of the molded product P is transferred and formed.

Therefore, since it is not necessary to transfer to the gypsum molds 5 and 6 and the sand molds 11 and 12 as in the conventional case, the female mold 25 and the male mold 26 can be easily manufactured, and after the master model 1 is manufactured. The number of steps required to form the molded product P can be significantly reduced.

By the way, in the case of the embodiment, from the production of the master model 1 to the shipment of the molded article P, it took about 80 days in the conventional example, but now it takes about 45 days. .

In the embodiment, when the male mold 26 is formed, the rib plate 30 is simply placed on the sheet wax 7 adhered to the mold face 50 of the female mold 25. The recess 60 a for forming the rib L can be easily formed in the mold 60, and the number of manufacturing steps of the mold 24 can be further reduced. By the way, in the conventional manufacturing method, after the male mold 16 is released from the female sand mold 12, a rib forming concave portion is separately provided on the mold surface of the male mold 16 by electric discharge machining or the like, thereby increasing the number of manufacturing steps. I was letting it.

When the molded article P is provided with a thin plate or needle-like projection such as the rib L,
If a projection is attached to a sheet material such as the sheet wax 7 attached to the mold surface 50, a predetermined mold surface 60 can be easily formed,
This can contribute to reducing the number of manufacturing steps of the molding die 24.

In the case where fine irregularities such as a grain pattern are formed on the surface of the molded product P, a sheet material having fine irregularities such as a grain pattern is adhered to the surface of the master model 1. If the female mold 25 is formed by casting the resin material 23 as in the embodiment, a mold surface 50 capable of forming fine irregularities such as a grain pattern can be easily formed on the female mold 25. 24 can contribute to reducing the number of manufacturing steps. By the way, in the conventional manufacturing method, after the female mold 15 is released from the male sand mold 11, the mold surface of the female mold 15 is separately corroded or the like, and fine irregularities are provided. .

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventional manufacturing process.

FIG. 2 is a schematic view showing a manufacturing process of one embodiment of the present invention.

FIG. 3 is a perspective view of a molded product manufactured in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Master model, 2 ... 3 Form frame, 7 ... (Sheet material) sheet wax, 14/24 ... Molding mold, 15/25 ... Female mold, 16/26 ... Male mold, 23 ... Resin material, 50 ... Mold Surface, 60: mold surface, P: (molded product) panel.

Claims (1)

(57) [Claims] 1. A method of manufacturing a molding die comprising a female die and a male die for injection- molding a molded product, wherein a heat resistance is provided on a surface side of a master model arranged in a mold frame. Inject the thermosetting resin material for the molding die, and after curing,
A female mold forming step of forming the female mold by releasing the mold and transferring the front side of the master model to a mold face; and attaching a sheet material to the mold face of the female mold by a thickness of the molded product. And at the same time, dispose the female mold in a mold,
On the side where the sheet material is adhered, for heat-resistant molding
Injecting a thermosetting resin material, after curing, releasing the mold, forming a male mold by transferring the surface side of the sheet material to a mold surface, after releasing the male mold forming step, A sheet material processing step of peeling off the sheet material from the female mold.