JPS6021174A - Production of bottomed hollow body - Google Patents

Abstract

PURPOSE:To produce easily a bottomed hollow body having the wall thickness sufficient for required physical strength by constituting a male mold of a material having elastic deformability, coating a low-melting metal to the required part on the outside circumferential surface thereof, solidifying said metal and removing the soldified metal. CONSTITUTION:A polyurethane male die 1 which consists of a supporting part 2 and a molding part 3 and of which the outside circumferential surface consists of a long- necked bottle shape is used. Said mold 1 is dipped in a molten bath of a low melting alloy to deposit said alloy on the mold and is then dried to form a deposited layer 4 over the entire outside circumferential surface of the upper part of the supporting part 2 and the part 3. The layer 4 is then removed by utilizing the elastic deformation performance of the mold 1 and a core for a molding die which is an intended product is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hollow body with a bottom using a male mold having excellent elastic deformability, and relates to a method for manufacturing a hollow body with an economical wall thickness that satisfies the required physical strength. A hollow body with a bottom can be easily obtained, and the inner circumferential surface of the male mold is provided with solid ribs by a simple operation of forming grooves at predetermined locations on the male mold's outer circumferential surface. The present invention provides a method by which a bottom hollow body can be obtained.

The conventional method for obtaining a hollow body with a bottom includes: trapping a cylindrical body, which is a molding material heated and softened, in a mold, placing a nozzle inside the cylindrical body, and blowing gas into the cylindrical body through the nozzle; Blow molding method, in which a cylindrical body is blown into the shape of a mold, (2) A split-type sealed container containing fluid molding material inside is rotated, and the molding material is applied to the inner circumferential surface of the container by centrifugal force. A rotational molding method in which the split mold airtight container is removed after uniform adhesion and solidification; (3) After immersing the male mold in a synthetic resin solvent solution or latex rubber liquid, the male mold is pulled out and the outer circumference of the male mold is removed. A dip molding method in which the synthetic resin or latex rubber layer stuck to the surface is solidified and removed from the male mold, (4) a molding material is put into the molding cavity formed by closing the split molds, There is a slush molding method in which the molding material in contact with the inner surface of the molding cavity and the molding material in the vicinity thereof is solidified, and the remaining molding material flows out of the mold while maintaining fluidity. (1) When using the blow molding method, the wall thickness of the hollow body obtained is not constant, and it is not possible to obtain a hollow body with ribs integrally molded on the inner peripheral surface, and (2) rotation. (3) When using a molding method, the shape of the hollow body obtained is limited to one with a circular cross section, and it is impossible to obtain a hollow body having ribs integrally molded on the inner peripheral surface. The dip molding method described in (4) is limited to a hollow body that is flexible, and the slush molding method described in (4) cannot produce a hollow body that has ribs integrally molded on the inner peripheral surface. They each have their own drawbacks.

The present invention utilizes a male die molded from a material having elastic deformability, and coats a fluid substance made of a low melting point metal or a general synthetic resin at a predetermined location on the outer peripheral surface of the male die. After solidifying the male mold, the male mold is removed by utilizing the elastic deformability of the male mold to obtain a hollow body with a bottom. It is possible to easily obtain a bottomed hollow body having an economical wall thickness that satisfies the physical strength required for a bottomed hollow body, that is, a wall thickness as set. To provide a method for molding a bottomed hollow body having solid ribs integrally molded on the inner circumferential surface by a simple operation using a male die having four stripes formed at the inner circumferential surface. It's a good thing.

The male die used in the method for producing a bottomed hollow body of the present invention must have elastic deformability, and may be made of, for example, synthetic rubber, urethane, or flexible synthetic resin sponge. The material applied to the outer peripheral surface of the male mold is a molten substance of a low melting point metal 2 A molten substance of a synthetic resin, a solvent solution or dispersion of a general synthetic resin, a fluid substance of a low melting point metal or a synthetic resin such as rubber latex, etc. The molding phase material is filled into the molding cavity created by placing the core in front of the cavity that is closed.

It is applied to the outer circumferential surface of the male mold by an appropriate method such as a casting method in which it is solidified and then molded, a dipping method, a spraying method, a roll coater method, or the like.

EMBODIMENT OF THE INVENTION Hereinafter, the specific structure of the manufacturing method of the bottomed hollow body of this invention is demonstrated based on drawing Example.

In FIG. 1, a polyurethane male mold 1 having a bottle-shaped outer peripheral surface with a long neck and consisting of a support part 2 and a molded part 3 continuous to the support part 2 is used, and the support part 2 of the male mold 1 is Applying a low melting point alloy to the entire outer peripheral surface of the upper part and the molding part 3 by immersing the male mold 1 in a molten bath liquid of the low melting point alloy,
It was dried at room temperature to form a coating layer 4 made of the low melting point alloy.

Next, the male die 1 is removed from the male die 1 having the coating layer 4 by utilizing the elastic deformation performance of the male die 1, and a second
A core 5 for a molding die, which is the target product shown in the figure, is obtained.

Note that the one shown in FIG. 3 has grooves 6 on its outer peripheral surface.
7 and 8 to obtain a bottomed hollow body having solid ribs on the inner circumferential surface. The low melting point metal is still a coating layer of a fluid substance made of synthetic resin.

The present invention is a method for manufacturing a bottomed hollow body having the above-described structure, in which a fluid material made of a low melting point metal or a general synthetic resin is placed on the outer peripheral surface of a male mold made of a material having elastic deformability. Painted.

After solidification, the male mold is pulled out by utilizing the elastic deformability of the male mold, so it is economical and has the strength required depending on the use of the resulting bottomed hollow body. Since it is possible to easily obtain a hollow body with a thick wall, that is, the wall thickness as designed, it is possible to save the amount of time required for molding to obtain the hollow body, and to reduce the weight of the obtained hollow body. It has the action and effect of

In addition, the method for manufacturing a bottomed hollow body of the present invention utilizes the elastic deformability of the male die to perform the operation of separating the coating layer and the male die from the male die having the solidified coating layer. Since the material applied to the outer circumferential surface of the male mold is not particularly limited, it can be used as a method for obtaining hollow bodies of metals and synthetic resins in general, and the molding material used can be It is extremely versatile.

Further, in the method for manufacturing a hollow body with a bottom of the present invention, a hollow body with a bottom having six solid ribs on the inner circumferential surface can be obtained by simply using a male mold having grooves on the outer circumferential surface. It is easy to operate.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an intermediate step in the method for manufacturing a hollow body with a bottom according to the present invention, and FIG. 2 is a longitudinal cross-sectional view showing an intermediate step in the method for manufacturing a hollow body with a bottom of ff1J according to the present invention. 1: male mold, 4: coating layer, 5: bottomed hollow core for a barrel molding mold, 9: male mold having four stripes 6, 7.8. Patent Applicant Toyota Motor Corporation Agent Osamu Ichikawa Yoshido Tatsuya Endo Figure 1 Procedural Amendment (Method) (Patent Office Examiner) 1. Indication of the Case 1980 Patent Application No. 3.2B786 2. Name of the invention: Method for manufacturing a hollow body with a bottom 3. Person making the amendment: Patent applicant (6179) Rikichi Ichikawa (1 other person) 5. Date of the amendment order: 7: Specification of contents of the amendment, page 9 Correct the column "f (1j simple explanation" of the drawing) as shown in the attached sheet. Above [4. Brief explanation of the drawings Figure 1 shows the intermediate steps of the method for manufacturing a hollow body with a bottom of the present invention. 2 is a longitudinal sectional view of a hollow body with a bottom obtained through the steps shown in FIG. 1, and FIG. 3 is a longitudinal sectional view of a hollow body with a bottom obtained through the steps shown in FIG. 1 is a vertical cross-sectional view showing 1: a male mold, 4: a coating layer, 5: a core for a molding die which is a hollow body with a bottom, and 9: a male mold having four stripes 6, 7, and 8. Patent applicant Toyota Jidosha Co., Ltd. Agent Osamu Ichikawa Yoshito Tatsuya Fuji

Claims (1)

[Claims] +11 A fluid substance made of a low melting point metal or a general synthetic resin is applied to a predetermined location on the outer peripheral surface of a male mold made of a material having elastic deformability. A method for manufacturing a hollow body with a bottom, which comprises solidifying the body and then removing the male mold. (2) The method for manufacturing a bottomed hollow body according to claim 1, wherein the male mold made of a material having elastic deformability has four stripes on its outer peripheral surface.