JPS6013514A - Manufacture of hollow product - Google Patents

Abstract

PURPOSE:To produce a light hollow product, with a small amount of forming material by a method in which a male mold is formed by filling the inside of the flexible hollow body having an opening at its one end with a removable filler, and after the forming material is put adhesively on the forming surface and is solidified, the filler is taken out and then the hollow body also is taken out. CONSTITUTION:A rubber or resin flexible hollow body 15 is composed of a forming surface 13 and a supporting part 14 and has an opening at one end thereof, and then said body 15 is filled with a removable filler 16, whereby a male mold 17 is formed. The forming surface 13 is covered adhesively with forming material by a suitable method, and after its solidification, the filler 16 is taken out first, and then the hollow body 15 is also taken out, thereby manufacturing the desired hollow product 18. The design of the economical thick wall durable sufficiently for physical strength under the environment in which the formed product is used, may be achieved, whereby the material used may be reduced and the product weight may be also decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention belongs to the field of fabrication technology for hollow products, and relates to a method for manufacturing hollow products.

(Prior Art) Conventionally, the following methods for manufacturing hollow products are known, and each method has advantages and disadvantages.

(a) Blow molding method A method in which a nozzle 2 is placed inside the molding material 1 that has been softened by heating, and a gas such as air is blown into the nozzle to inflate the molding material to produce a desired hollow product 3 (Fig. 1). reference). This method has the advantage of having a high degree of freedom in the shape of the product by using appropriate equipment, but it is difficult to integrally mold a solid lip on the outer surface of the molded product, which has an uneven wall thickness. However, there is a problem in that it is impossible to integrally mold the lip on the inner surface.

(b)) Extrusion molding method A method in which a molding material 4 that has been softened by heating and has fluidity is passed through a die 5 to produce a cylindrical hollow product (see Fig. 2).

This method has the advantage of being able to manufacture J-length hollow products, but the product shapes that can be used are limited to those with a constant cross section, curved pipes cannot be formed, and hollow products with bottoms cannot be formed. There are other problems.

(c) Rotational molding method The molding material 7 is placed in a sealed container 6, and the container 6 is rotated to give it fluidity.The molding material 7 is uniformly adhered to the inner surface of the container by centrifugal force and solidified, forming a hollow Those that manufacture products (see Figure 3).

This method has the advantage of high transfer accuracy, but has problems such as the lip cannot be integrally molded on the inner surface of the hollow product and the cross section of the applicable product shape is limited to a circle.

2) Dip molding method A hollow product is produced by dipping a male mold 8 into a solution of plastic or latex rubber 9 dissolved in a solvent, then taking it out and solidifying it (see Figure 4).

This method has the problem that the equipment cost is limited to inexpensive and high-quality molding materials.

(E) Slash molding method The molds 10 and 11' are closed, and the molding material is poured into the closed molding cavity. Other molding materials have fluidity! A hollow product is produced by taking it out of the mold (see Figure 5).

This method has the advantage of high transfer accuracy, but has the problem that the lip cannot be integrally formed on the inner surface of the hollow product.

(Object of the Invention) The present invention has been made in view of the problems existing in the above-mentioned prior art, and it is possible to integrally mold a lip on the inner surface of a hollow product, thereby reducing the amount of molding material used and the weight of the product. The object of the present invention is to provide a method for manufacturing hollow products that reduces the

(Structure of the Invention) In order to achieve the above object, the structure of the present invention is characterized in that it consists of a molding surface and a support part, and that the special filling is removed from one end of the support part and the hollow body is taken out. If a groove is provided in advance on the outer circumferential surface of the male mold, a hollow product can be obtained by integrally molding a lip on the inner surface of the male mold.

(Example) Hereinafter, an example of the present invention will be described using FIGS. 6 and 7.

In a male mold 17 in which a removable filler 16 is filled into the inside of a hollow body 15 having
6'(r) and then take out the hollow body 15 to produce the desired hollow product 18.

Now, as shown in FIG. 7, the molding surface 1 of the male mold 17 is
If grooves 19, 19' and 19' are provided in the hollow product 19 and molded in the same manner as described above, a hollow product 18 with integrally molded lips on the inner surface is obtained.

The filler may include powder or granules made of metal, synthetic resin, wood, or other nonmetallic material, a binder that connects all of the powder or powder, integrally molded ice, or fibrous substances. used.

(Effects of the Invention) As described above, the present invention provides the following effects.

(a) It has become possible to design an economical wall thickness that is sufficient to withstand the physical strength of the molded product in the environment in which it is used, and it has also become possible to integrally mold the inner surface of the hollow product.

(b) As a result, more economical wall thickness design is possible and the amount of material used can be reduced.

(c) It can also reduce the weight of the product.

(b) Through the above steps, hollow products with sufficient strength can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are cross-sectional views of the main parts showing the conventional blow molding method, Figure 2 is a cross-sectional view of the main parts showing the extrusion molding method, and Figure 3 is the same rotary molding method. A sectional view of the main parts shown,
Figures 4 (a) and (b) are cross-sectional views of the main parts that also show the dip molding method, Figures 5 (a) and (b) are cross-sectional views of the main parts that also show the slush molding method, and Figure 6 is a cross-sectional view of the main parts that also shows the slush molding method. FIG. 7 is a cross-sectional view of one embodiment of the present invention, and FIG. 7 is a cross-sectional view of another embodiment. 13... Molding surface 14... Support portion 15... Hollow body 16... Filler 17... Male mold 18... Hollow product 19. 19', 19''... Groove patent applicant Toyota Motor Corporation (and 1 other person) Age 5 Figure (a) (b)

Claims (2)

[Claims] (1) A method for manufacturing a hollow product, which comprises removing a hollow body from a flexible hollow body consisting of a molding surface and a bearing part, and having one end of the bearing part open. (2) A method for manufacturing a hollow product according to claim Zl'J, characterized in that a groove is provided on the molding surface of the front mc male mold, and a lip is formed on the inner wall surface of the hollow product.