JPS62124048A - Production of simple metallic mold - Google Patents

Abstract

PURPOSE:To eliminate the need for an operation by a machine tool and to reduce the cost of production by fashioning a rubber mold from a product model made of a wooden pattern, etc., pouring a low melting metal, etc., into such mold to form a casting model and producing a metallic mold consisting of a low melting alloy from such casting model. CONSTITUTION:The product model 1 which is fashioned of the wooden pattern, plastic, etc., and is attached with a runner bar 3 at one end is first fixed to the center in the space part of a flask body 2 and rubber 5 is poured into the space of the flask body 2 in the 1st stage. The model is taken out of the body 2 upon solidification of the rubber 5 and is incised to the top and bottom. The product model 1 is taken out and the rubber mold 8 is thus formed. The low melting packing material 9 which is plastic or low melting metal is poured into such rubber mold 8 to form a model 11 for casting in the 2nd stage. A female metallic mold and male metallic mold are formed of a low melting alloy by using the model 11 in the 3rd stage. The metallic mold is thus easily produced without the stage using the machine tool.

Description

Detailed Description of the Invention (Industrial Field of Application)
In particular, the present invention relates to a method for manufacturing a simple mold that is most suitable for prototypes, but can also be used for other mass-produced products that do not require precision.

(Conventional technology) Conventionally, molds for prototypes or for mass-produced products that do not require high precision are not made directly from plastic product models, but instead are made using machine tools such as lathes and drill presses. It was used to manufacture molds.

(Problems to be Solved by the Invention) However, the molds manufactured using machine tools such as lathes and ball M, as described above, do not undergo any design changes during the transition from prototype to final product. There is no problem if it can be used as is, but manufacturing molds is quite expensive, so if there is a design change to the prototype, a new mold must be manufactured, and this can be costly. The problem was that the molds used up to that point were completely wasted, and the economic loss was immeasurable.

The present invention was made in view of this problem. A rubber mold is taken from a product model made of wood or plastic, a casting model is made from the rubber mold, and a low-cost model is made from this casting model. The purpose of this paper is to provide a method for manufacturing a simple mold made of fusion metal, which is especially suitable as a mold for a prototype.

(Means for Solving the Problems) In order to achieve the above object, the method of the present invention involves creating a rubber mold from a product model made of wood or plastic, pouring plastic or refractory metal into the rubber mold, and casting. A model is made, and then a mold is manufactured from the cast model using a low alloy metal.

(Function) According to the method for manufacturing a simple mold according to the present invention, a product model made of a wooden mold or plastic is used to pour a low alloy metal into the mold, eliminating the need for work with machine tools such as lathes and drill presses. is extremely simple and inexpensive to manufacture, and even if there is a design change in the product after the mold is manufactured and the mold is no longer needed, there will be little economic loss because the manufacturing cost is low.

(Example) An example of the implementation of the manufacturing method of the present invention will be explained in detail with reference to the drawings.In the first step, first, a product model 1 (Fig. 1) made of a wooden mold, plastic, etc. 2. To attach this product model 1 to the frame 2, fix the thirst rod 3 to one end of the product model 1 with adhesive, and place the product model 1 in the center of the space 4 of the frame 2. (Fig. 2).Then, place the frame 2 with the product model 1 set in a vacuum chamber, and inject the rubber 5 into the space 4 of the frame 2 (Fig. 3). After solidification, take out the frame 2 from the vacuum tower, release the frame 2 from the rubber 5, cut the rubber 5 vertically, take out the product model 1, and make the inverted shape of the product model 1. Rubber type 8 with a thirsty lower on 6
(Figure 4).

In the second step, the rubber mold 8 obtained in the first step is tightly joined with the incised portion in the first step, and the rubber mold 8 is exposed to a temperature of t% + A low-melt filler 9 made of plastic or a low-melt metal with a melting point of about 200°C is poured in (Fig. 5), the rubber mold 8 is placed in a drying tank, the low-melt filler 9 is hardened, and then the rubber mold is 8 from the drying tank, the rubber mold 8 is divided along the cut surface, the hardened low-melt filler 9 is taken out, and the runner 10 is cut to form a casting model 11 (FIG. 6).

J5, the casting model 11 made by this process has a rubber mold 8 filled with a low-melting filler 9! When r1, rubber mold 8
Because it expands due to the heat, it becomes a nice product that is larger than Product Model 1.

The third step is the casting model 1 obtained by the above steps.
1 is filled with a shape-retaining filler 12 such as plaster or clay (Fig. 7), and after the shape-retaining filler 12 has hardened, the casting model 11 is placed in the center of the female formwork 13. (FIG. 8), the upper mold for pouring 14 is placed on top of the female mold 13, the female mold 13 is set in the casting machine, and the sprue 15 of the upper mold for pouring 14 is set. 1)) whose melting point is 200°C or less, tin, antimony, cadmium,
or a plurality of them and a low alloy alloy 16 of bismuth are poured and pressure is applied (FIG. 9). After waiting for the assimilation of the low alloy metal 16, the upper mold for pouring 14 is removed, the filler for retaining the shape 12 is removed, and the casting model 11 is released from the female mold 13. , apply a mold release agent to the surface of the VR horse production model 11 and the shape-retaining filler 12 (Fig. 10),
Then, the male formwork 17 is placed on top of the female formwork 13, and the upper formwork 18 for pouring is placed on top of the male formwork 17, and the same as the platform for the female formwork 13 is set on the H-building machine and poured. The low alloy alloy 16 is poured into the sprue 19 of the upper formwork 18 and pressure is applied (
11), after the low alloy alloy 16 has solidified, the male formwork 17 and the upper formwork 18 for pouring are poured from above the female formwork 13.
Remove the casting model 11 and separate the female molds 2.
0 (FIG. 12) and a male mold 21 (FIG. 13).

In addition, a female formwork 13 covered with the upper formwork 14 for pouring, and a male formwork 1 covered with the upper formwork 18 for pouring.
7 is simply poured into the female formwork 13 and the male formwork 17 without setting it in a casting machine when pouring the low-alloy metal 16, respectively, and connected to a compressor to apply pressure. However, the same effect is increased by 1q.

(Effects of the Invention) Since the method of the present invention is as described above, it is possible to extremely easily manufacture a mold from a wooden mold or a product model without going through a process using a machine tool such as a lathe or drill press. The manufacturing cost is low, so it is ideal as a mold for prototypes molded from plastic or refractory metal in quantities of about 100, and in some cases it can be used as a semi-industrial mold for products that do not require precision. However, after being used as a mold, the mold is made of a low-fusion metal, so it can be melted and reused, and the casting model is made of a low-fusion metal, allowing for shrinkage, and using the expansion action of the rubber mold. Since the product is made larger than the product model, the product molded by the mold shrinks when cooled, resulting in a product with dimensions close to the product model.

[Brief explanation of drawings]

The figures show an example of the implementation of the present invention, and FIG. 1 is a vertical cross-sectional view of a product model, and FIG. Front view, 3rd
The figure is a longitudinal cross-sectional view showing a state in which rubber is injected into the space of the frame, and FIG. 4 is a perspective view of a rubber mold formed by cutting out the rubber.
Figure 5 is a vertical cross-sectional view showing the state in which the low-melt filler is poured into the rubber mold, Figure 6 is a vertical cross-sectional view of the casting model taken out from the rubber mold, and Figure 7 is a vertical cross-sectional view of the casting model taken out from the rubber mold. A vertical cross-sectional view showing a state in which the mold retention filler is filled, Fig. 8 is a plan view showing a state in which a casting model is set in a female formwork, and Fig. 9 is a plan view showing a state in which a casting model is set on a female formwork. A front view showing a state in which the upper formwork is covered, FIG. 10 is a perspective view of the female formwork without the upper formwork for pouring removed and the retaining filler removed;
Figure 11 is a front view showing the male mold and the upper mold for pouring over the female mold, Figure 12 is a perspective view of the female mold, and Figure 13 is the male mold. FIG. In the figure, 1 is a product model, 2 is a frame body, 3 is a thirst bar, 4 is a space, 5 is rubber, 6 is an inverted shape, 7 is a sprue, 8 is a rubber mold, 9 is a low melting filler, 10 is a runner, 11 is a casting model,
12 is a filler for shape retention, 13 is a female mold, 14 is an upper mold for pouring, 15 is a sprue, 16 is a low alloy metal, 17 is a male mold, 18 is an upper mold for pouring, 19 is a sprue, 20 is a female mold, and 21 is a male mold. November 25, 1985 Inventor Azuma
Yoshio Figure 1 Figure 2! ! I Fig. 3 Fig. 5] U Fig. 7 Fig. 8 Fig. 10 Fig. 12 Fig. 13

Claims (1)

[Claims] A product model with a fixed runner rod is set in a frame, placed in a vacuum chamber, rubber is injected into the space of the frame, and after the rubber solidifies, it is taken out from the vacuum chamber and the frame is filled with rubber. a first step of releasing the rubber from the mold, and then cutting the rubber into two to take out the product model to form a rubber mold with a sprue in the gap in the shape of the product model; After the parts are closely joined, a low-melt filler made of low-melt plastic or low-melt metal is poured through a sprue, and the rubber mold is placed in a drying tank to harden the low-melt filler.After that, the rubber mold is taken out of the dryer and cut open. a second step of taking out the hardened low-melt filling and cutting a runner to form a casting model; filling the recessed part of the casting model with plaster;
After this plaster has hardened, a casting model is set in the female formwork, a pouring top cover is placed on top of it, and a low fusion alloy with a melting point of 200°C or less is poured through a sprue and pressure is applied. After the gold solidifies, remove the pouring top cover, remove the plaster, and place the male mold on top of the female mold without separating the casting model from the female mold. Covering the upper lid, pour the low alloy metal through the sprue and apply pressure. After solidifying the low alloy metal, remove the male mold and the pouring upper lid from above the female mold, and release the casting model. A method for manufacturing a simple mold, comprising: a third step of molding to form a female mold and a male mold, respectively.