JPS5939511A - Molding method of synthetic resin or rubber - Google Patents

Abstract

PURPOSE:To obtain a molded piece short of a navel part by a method wherein a fixed quantity of molding material is supplied into a mold through an injection hole, the injection hole is closed by a plug in a state of compression and the molding material can be kept from flowing backward to the injection hole. CONSTITUTION:Molding material (synthetic material or rubber) (a) is supplied from an extruder 8 into molds 1, 2 through an injection hole 3. The nozzle 9 of the extruder 8 is retreated and the plug body 11 of a stopper 10 closes the injection hole 3 in a state of compression. The mold 2 is moved upward and the molds 1, 2 are closed tightly to compress and mold the molding material (a). In this case, cooling water is passed through water holes 6, 17, cooled and hardened or the mold is heated and hardened. EFFECT:Since the molded piece has no navel part, a molded piece of fine finish, free from stress concentration to the root of the navel and of uniform strength can be obtained. This piece is manufactured efficiently because the navel cutting process is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pressure molding a thermosetting resin, thermoplastic resin or rubber in a mold.

It is the first object of the present invention to provide a method for molding plastic or rubber, which has a beautiful finish, does not cause local stress concentration, and allows the molding operation to be carried out efficiently.

In order to achieve the purpose of the present invention, the mold ill +
21, the fixed molding material ta+ is introduced through the injection hole (3).
After transferring the injection hole (3) under pressure, the mold il+ F21 is closed and the molding material ta+ is transferred.
It is characterized by compressing and cooling or heating.

The present invention will be specifically described below based on embodiments shown in the drawings.

First, a method for molding thermoplastic resin using the illustrated apparatus will be specifically described. In the center of the upper female mold 11), there is provided an injection hole (3) whose upper part is a Taber hole (4) and whose lower part is a right circular hole (5). A male mold (2) is arranged below this female mold (1). Both molds (1) and (2) have water holes for circulating cooling water.
・We have established

The molding material (1!II8 plastic resin) (a) is placed in the hopper (
7) into the extruder (8), where it is heated to a predetermined temperature and then inserted into the mold through the injection hole (3).
(Transferred into 2+. At this time, male and female molds (1) (2)
4. is set in a half-open state as shown in Figure 1. . 4.4 II ta+ U male and female mold i
ll t2) (D li 1lli Karaik li
The flow rate is adjusted to have a viscosity with no culm. l When the operation of transferring the molding material T&L is completed, the extruder (8)
The nozzle (9) is retracted obliquely to the injection hole (3).
) becomes open. Immediately thereafter, the stopper device,
10) is activated and the injection hole (3) is closed under pressure by its plug (river) as shown in FIG. (14), and is formed so as to fit into the injection hole (3).When the stopper is closed, as shown in FIG.
The vagina is 1-1tl of the female mold (1) (matches +51l,
ing. It is preferable that the stopper device id (111) is provided with a pressure cylinder (li9 (a hydraulic cylinder may be used) so that the specimen (11) can be moved up and down automatically.

In addition, a water passage hole θη for circulating cooling water is also provided inside the plug body (IJII shown in FIG. 3).
From the crumb 11 to the line, the male mold (2) is moved to -L)J, both molds il+ 121 are tightly closed, and the molding phase tal is compression molded. At this time, t'J'II water passage hole f
lft +61...+17) 0η... to form a ring (A size tal is cooled and hardened. Also, the plug body (11) is closed under pressure. So,
Even at 6 o'clock when the mold is fi+ +21, the distance is about 1m.
hold.

The above is an explanation of the method for molding thermoplastic resins, but when molding hardening resins and combs, it is only necessary to provide an appropriate mold heating means in place of the cooling means mentioned above, and other molding steps can be carried out. This is the same as the above embodiment.

The present invention has the above configuration, and when the mold il+ +21 is tied, the injection hole (3) of the mold il+ is closed under pressure, so that the molding material (&) enters the injection hole (3). It can prevent backflow. Therefore, there is no belly button part (small part) in the finished product, the finish is beautiful, and there is no need to cut the belly button, making it possible to proceed with the work efficiently.

In addition, since the navel part is not bent, it is possible to avoid stress concentration around the base of the navel part as in conventional products.
It is possible to obtain a finished product with a second degree of excellence.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the invention, and FIGS. 1 to 3 are schematic diagrams sequentially illustrating the method of the invention. . il+ +21...Teino 1υ (:1)...tlE human hole (al...molding material oblique application person)
Black 1) Shige Haruyo Masato
Patent attorney Masaru Ishihara @1 diagram

Claims (1)

[Claims] (1) A fixed amount of molding material was introduced into the metal hole through the manhole, and the manhole was closed under pressure and the metal was poured into the metal hole. A method for molding synthetic m 1IIIx it rubber, characterized in that the molding material is moved under full pressure by closing the 1 v, and the molding material is cooled or heated.