JPH069922U - Synthetic resin injection mold runner lock pin - Google Patents

Abstract

(57) [Summary] (Corrected) [Construction] The cooling circuit 2 is provided in the runner lock pin of the synthetic resin injection mold to prevent the tip of the runner lock pin from becoming hot and to fix the runner 7. And the cooling time of the entire mold 10 is shortened. [Effect] There is no fear that the tip of the runner lock pin will be softened by the heat of the molten resin, and the runner can be fixed securely, and troubles of stopping the machine in the molding process can be eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a runner lock pin for a synthetic resin injection molding die.

[0002]

[Prior art]

 There is little development of this kind, and as a model somewhat similar to this, there is a certain amount of the pneumatic pressure transfer mold of the invention filed by the applicant of the present application in Japanese Patent Application No. 221394 of the present application. Are different.

[0003]

[Problems to be solved by the device]

 Further, as shown in FIG. 3, the runner lock pin has an undercut portion at the tip of the pin at the time of molding to function to hold the runner 7 when the mold is opened. The lock pin body 1 is not cooled, the heat of the molten resin raises the temperature of the tip of the runner lock pin, the tip of the runner lock pin becomes soft, the runner is not firmly fixed, and the runner 7 is left in the mold. Is likely to occur. In the runner itself, the resin is unevenly thickened at the location of this lock pin, the cooling of the resin in the runner part is significantly deteriorated, and the fixing to the runner lock pin is weakened while the temperature is high and the state is soft. I needed to lengthen the time.

Referring to FIG. 3, reference numeral 8 indicates a product. First, the mold 10 is opened, but when the mold 10 is opened, the liner 7 tries to come out of this mold. Therefore, it is fixed to the runner plate 11 with the runner lock pin.

[0005]

[Means for Solving the Problems]

 Next, the present invention will be described.

A cooling circuit is provided inside a runner lock pin for fixing the passage and the sprue of the molten synthetic resin.

[0007]

[Action]

 Since the present invention has the above-described structure, unlike the conventional one, since the cooling circuit is provided, there is no fear that the tip of the runner lock pin will be softened by the heat of the molten resin, and the runner can be fixed. Since it is reliable, the trouble of stopping the machine in the molding process can be eliminated, the product quality can be stabilized, and the cooling time of the entire mold can be shortened. .

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

First, the structure of the present invention will be described. A cooling fluid circuit 2 is provided inside a runner lock pin for fixing a passage and a sprue of molten synthetic resin.

Explaining in a broad manner, the inside of the runner lock pin body 1 is formed in a hollow portion 5, and a pipe 6 connected to the cooling fluid inflow passage 3 is hung down in the center of the hollow portion 5 to cool the cooling fluid. The circuit 2 is formed, and the cooling fluid from the outside first passes through the inside of the pipe 6 in the central portion from the entrance passage 3, that is, flows downward from the central portion in the runner lock pin body 1, and the tip of the pipe 6 It is ejected to the outside of the pipe 6 at a part, and is discharged to the outside from the upper outlet 4.

[0011]

[Effect of device]

 Since the present invention has the above-described structure, unlike the conventional one, since the cooling circuit is provided, there is no fear that the tip of the runner lock pin will be softened by the heat of the molten resin, and the runner can be fixed. Since it is reliable, the trouble of stopping the machine in the molding process can be eliminated, the product quality can be stabilized, and the cooling time of the entire mold can be shortened. .

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view showing a usage state of the present invention.

[Explanation of symbols]

 1 Runner lock pin body. 2 Cooling fluid circuit 3 Inlet passage 4 Outlet 5 Cavity 6 Pipe 7 Runner 8 Product 9 Mold 10 Mold 11 Runner plate

Claims (1)

[Scope of utility model registration request] 1. A runner lock pin for a synthetic resin injection molding die, wherein a cooling circuit is provided inside a runner lock pin for fixing a passage and a sprue of a molten synthetic resin.