JPS6354469B2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a method of manufacturing a mold member, and in particular, the present invention relates to a method of manufacturing a mold member, and in particular, a method of manufacturing a mold member by only molding without using any cutting process.
The present invention relates to a novel improvement for obtaining a metal mold member from a non-fireproof master mold.

b. Prior Art This type of mold member that has been used in the past has been made by cutting a single-piece thick plate member by machining or hand processing using craftsmanship.

c. Problems to be Solved by the Present Invention However, processing using the above-mentioned conventional method relies heavily on the skill of the craftsman, and is considered a so-called craftsmanship, which takes time, significantly increases costs, and increases the product price. The impact was growing.

Furthermore, as the life cycle of products becomes shorter, it is necessary to release new products one after another, and conventional methods, which take a large amount of time and cost, cannot fully meet these demands.

The present invention has been made to solve the above-mentioned problems, and particularly provides a method for manufacturing a mold member in which a metal mold member is obtained from a non-refractory master mold only by molding. The purpose is to

d Means for Solving the Problems The method for manufacturing a mold member according to the present invention includes a first method in which a ring-shaped pedestal body 15 is fitted to an end of a non-refractory wooden mold or master mold 13 having a desired shape. a second step of holding the mold 13 in an outer mold 16; a third step of injecting a molten material such as molten silicone rubber between the mold 13 and the outer mold 16; A fourth step of separating and taking out the rubber mold 18 from between the mold 13 and the outer mold 16, and filling the rubber mold 18 with a fireproof material and drying it, and a mold having the base body 15 obtained in the first step. 13, a sixth step of forming a lost wax film 21 on the entire outer surface of the refractory mold 20, and a sixth step of forming a lost wax film 21 on the entire outer surface of the refractory mold 20. A seventh step of covering everything except the injection port 22 with a refractory burial material 23 and firing it, and inserting the injection port 22 into the void formed in the burial material 23 by the lost wax film 21 that has been atomized in the seventh step. This method consists of an eighth step of injecting the molten alloy through the mold, and a ninth step of obtaining the mold member 1 by crushing the buried material 23.

e Effect In the method for manufacturing a mold member according to the present invention,
A refractory mold is made from a non-refractory prototype, then a coat of Lost Wax is applied to the outer periphery of the refractory mold, the entire body is fired, and metal is poured into the void formed to create a non-refractory mold. A metal mold can be freely and easily made from a fireproof master mold, the cost of forming mold members can be greatly reduced, and it can be suitably adapted to high-mix, low-volume production.

f Example Hereinafter, a preferred example of the method for manufacturing a mold member according to the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, what is indicated by the reference numeral 1 is a first mold member, and this first mold member 1
has a so-called concave female shape, is made of a thin and strong material such as a cobalt alloy, and is integrally held by a base part 2 made of a low melting point metal. A second mold member 3 having a convex male shape and having substantially the same shape as the first mold member 1 is disposed inside the first mold member 1. The member 3 is integrally held by a base portion 4 made of a low melting point metal, and a gap 5 having the same shape as the cap-shaped molded product is formed between each mold member 1 and 3. .

The inner surface 1a of the first mold member 1 and the outer surface 3a of the second mold member 3 are each provided with a required shape so that the pattern or letters of the molded product stand out.

Further, as shown in A in FIG. 2, the first mold member 1 has a flange 6 and integrally has a positioning projection 7 for positioning, and the second mold member 3 has a flange 8. A positioning notch 9 for positioning is formed in the mold, and when the mold members 1 and 3 are fitted together as shown in FIG. 1, each positioning protrusion 7 engages with each positioning notch 9. As a result, the character portion 10, the thread groove 11, etc. are reliably aligned.

Furthermore, the base portion 2 and the first mold member 1 include:
An injection port 12 is formed for injecting and injecting a melt molding material, for example, a synthetic resin, and the melt molding material for molding a molded product is injected into the void 5 in a dense state. be.

As shown in FIGS. 1 and 2, each of the mold members 1 and 3 is made of a high-strength material such as a cobalt alloy and has a small thickness. , the manufacturing process of each of the mold members 1 and 3 will be explained.

Fig. 3 shows the manufacturing process in a simplified manner. First, what is indicated by A is the target wooden mold or master mold 13, and in order to make this wooden mold or master mold 13, a scalpel is used. It is necessary to make the first mold member 1, which is a mold, and the second mold member 3, which is a male mold, but since both the first and second mold members 1 and 3 are manufactured using the same manufacturing process, In this embodiment, a process for manufacturing the first mold member 1, which is a female mold, will be described.

In FIG. 3, a fireproof material 14 is filled into a target wooden mold or master mold 13 (usually a wooden mold) made of non-refractory wood or plastic, and this mold 1
3 (indicated by B). Next, the mold 13 in the state of B is held in the outer mold 16 and molten silicone rubber is injected as a molten material to form a rubber mold 18 shown as D, and the recess 19 of this rubber mold 18 is It has exactly the same size and shape as the external shape.

Next, this rubber mold 18 is filled with refractory material,
When dried and released from the rubber mold 18, a refractory mold 20 having the same shape as the original mold 13, indicated by B, is obtained.

The irregularities on the outer surface 20a of this refractory material mold 20 have exactly the same shape as the irregularities on the outer surface of the mold 13, and a paraffin film 21 as a lost wax is attached to the outer surface 20a by pressing it by hand. G.

As shown in FIG. 4, the refractory material mold 20 in the above-mentioned state G is completely covered with a refractory embedding material 23 made of a refractory material and having an injection port 22, and then this embedding material 2 is
When the entire 3 is placed in a furnace (not shown) and fired, the paraffin film 21 is evaporated and atomized, and an injection port 22 is communicated with the injection port 22 in the embedding material 23 to form the same shape as the first mold member 1. Voids (paraffin film 21
) is formed, and in this state, as shown in FIG. 5, when molten cobalt alloy is injected from the injection port 22, the first mold member 1 is formed, and then the buried material 23 is crushed, By cutting the injection port 22, the first mold member 1 shown in FIGS. 1 and 2 is completed.

Since the second mold member 2 is also made by the same manufacturing process as the first mold member 1, in this example,
The explanation thereof will be omitted.

First mold member 1 manufactured as above
As shown in FIG. 6, after being held in a pedestal 25 having a frame 24, a low melting point alloy that melts at about 250° C. is injected and solidified, so that the pedestal 2 is integrally formed. If the pedestal 25 is removed, the same configuration as shown in FIG. 1 as shown in FIG. 7 is obtained.

Incidentally, when the base parts 2 and 4 are installed in an injection molding machine, they can be easily mounted by forming a mounting hole (not shown).

Further, in this embodiment, a case has been described in which two mold members are used, but it is also possible to mold only a simple one-sided pattern using only one mold member.

g Effects of the Invention Since the method for manufacturing a mold member according to the present invention is configured as described above, any person can extremely easily and quickly produce a metal mold member from a non-refractory prototype, regardless of craftsmanship. The present invention has the effect of revolutionizing the manufacturing of synthetic resin and metal molded products of various types and in small quantities.

It has been found that it is extremely effective to use a refractory material such as cement instead of a low melting point alloy when forming a glass molded product for each of the bases 2 and 4.

[Brief explanation of drawings]

The drawings are for illustrating the method of manufacturing a mold member according to the present invention, and FIG. 1 is a sectional view showing a state in which each mold member is combined, and A and B in FIG. 2 only show the mold member. A perspective view, A to G in Fig. 3 are process diagrams showing the manufacturing process, Figs. 4 and 5 are sectional views showing the manufacturing process, and Figs. 6 and 7 are the mold members integrated with the base. FIG. 1...First mold member, 2...Base part, 3...Second
Mold member, 4... Base part, 5... Gap, 6... Flange part, 7... Protrusion, 8... Flange part, 9... Notch part, 1
0... Character portion, 11... Thread groove, 12... Inlet, 13... Mold, 14... Fireproof material, 15... Pedestal body, 16... Outer mold, 17... Silicone rubber, 18
...Rubber mold, 19 ... Recessed part, 20 ... Fireproof material mold,
21... Paraffin membrane, 22... Inlet, 23...
...embedding material, 24...frame, 25...pedestal.

Claims (1)

[Claims] 1 Non-fireproof wooden mold or prototype 1 that forms the required shape
A first step of fitting a ring-shaped pedestal body 15 to the end of the mold 3, a second step of holding the mold 13 in the outer mold 16, and a step of applying molten silicone rubber between the mold 13 and the outer mold 16 a third step of injecting a molten material such as the like, a fourth step of separating and taking out the rubber mold 18 made of the molten material from between the mold 13 and the outer mold 16, and filling the rubber mold 18 with a refractory material. a fifth step of drying and obtaining a refractory material mold 20 having the same external shape as the mold 13 having the pedestal body 15 obtained in the first step;
a sixth step of forming a lost wax film 21 on the entire outer surface of the refractory mold 20; and a sixth step of forming a lost wax film 21 on the entire outer surface of the refractory mold 20;
The seventh part is covered with fireproof burial material 23 and fired except for
an eighth step of injecting molten alloy through the injection port 22 into the void formed in the buried material 23 by the lost wax film 21 atomized in the seventh step; A method for manufacturing a mold member, comprising a ninth step of obtaining a mold member 1 by crushing.