JPH091598A - Injection molding tool - Google Patents

Abstract

PURPOSE: To provide an injection molding tool capable of attempting improvement of productivity without requiring change operation of a locating ring though an injection molding machine to be used is changed. CONSTITUTION: In this injection molding tool 10 wherein a fixing side fitting plate 12 is fixed to a fixed mold by abutting against that; and a sprue bush 13 and a locating ring 14 fitted between the sprue bush 13 and the fixing side fitting plate 12 are provided to the fixing side fitting plate 12, a concentric cylindrical stage 14a of which a diameter is gradually enlarged toward outside is provided to a tip side of the locating ring 14. Further, the locating ring 14 can be moved to the front and the rear parallel to the sprue bush 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die which does not require replacement of a locate ring for positioning the die corresponding to an injection molding machine.

[0002]

2. Description of the Related Art Conventionally, an injection molding die is positioned with respect to an injection molding machine by using a locate ring provided substantially at the center of a fixed die of the injection molding die. The tip is pressed against the sprue bush of the injection molding die for positioning (actual opening flat 5-
No. 58244).

The injection mold will be described with reference to the drawings. As shown in FIG. 3, the sprue bush 200 is provided at the center of the fixed side mounting plate 101 of the fixed mold 100.
Is fitted and the locate ring 300 is attached to the outer peripheral portion of the sprue bush 200. The shape and size of the locate ring 300 is determined according to the corresponding injection molding machine. Therefore, when the injection molding die is attached to another injection molding machine and molding is performed, the locate ring of the injection molding die is replaced.

[0004]

However, in the structure of the conventional injection molding die described above, every time the injection molding machine to be used is changed, a locate ring suitable for this injection molding machine is prepared and injection is performed. There is a problem that the locate ring of the molding die must be replaced.

The present invention has been made in view of the above problems, and an object thereof is to solve these problems and change the injection molding machine to be used. It is an object of the present invention to provide an injection molding die capable of improving productivity without requiring replacement work of a locate ring.

[0006]

In the injection mold of the present invention, a fixed side mounting plate is fixed by abutting on the fixed type, and the sprue bush and the sprue bush and the fixed side are fixed to the fixed side mounting plate. In an injection molding die in which a locate ring is fitted between the mounting plate and the mounting plate, a concentric step portion whose diameter is gradually increased outward is provided on the tip side of the locate ring, and The locate ring is movable back and forth in a direction parallel to the sprue bush.

That is, the outer diameter of the locate ring for positioning with the mating side is provided over a plurality of positions so as to be compatible with a plurality of types of injection molding machines that are expected to be used on the tip side of the locate ring. In addition, in order to adjust the position in the front-rear direction, the locating ring that is conventionally fixed to the fixed-side mounting plate has a structure that is movable in the front-rear direction.

[0008]

In the injection molding die of the present invention, a concentric step portion whose diameter is gradually increased outward is provided on the tip side of the locate ring so that it can be applied to a plurality of types of injection molding machines. In addition, since this locate ring is movable back and forth in the direction parallel to the sprue bush, the nozzle of the injection molding machine is positioned accurately and even if the injection molding machine used is changed, No replacement work is required, and productivity can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of an example of an injection molding die of the present invention. In FIG. 1, a mold 10 for injection molding has a structure in which a fixed mold 11 is attached to a fixed side mounting plate 12. The fixed mold 11 and the fixed side mounting plate 12
A sprue bush 13 is provided in a central portion of and in such a manner that it is fitted into the fixed mold 11. A fitting portion 13a with which a nozzle (not shown) of the injection molding machine abuts is provided at the tip of the sprue bush 13.

An enlarged diameter portion 13b is provided on the tip side of the sprue bush 13 and a locate ring 14 is provided on the outer peripheral portion of the enlarged diameter portion 13b. The sprue bush 13 is slidably fitted in the expanded diameter portion 13b.

On the tip end side of the locate ring 14, a plurality of concentric stepped portions 14a whose diameters are sequentially expanded outwardly.
Is provided. The stepped portion 14a is provided with its diameter determined so as to be compatible with several types of injection molding machines used.

A screw 14b is provided on the outer circumference of the locate ring 14 and is screwed with a screw 12a provided on the fixed side mounting plate 12. Therefore, the locate ring 14
By rotating, the inner peripheral surface of the locate ring 14 smoothly slides on the outer peripheral surface of the sprue bush 13 and is moved in the front-back direction.

By the movement of the locate ring 14 in the front-rear direction, the position of the mating injection molding machine is determined together with the corresponding outer diameter portion of the step portion 14a, and the sprue bush 1
The nozzle of the injection molding machine is accurately fitted into the fitting portion 13a at the tip of No. 3, so that the molten resin can be reliably injected into the mold.

FIG. 2 is a sectional view showing the main part of another example of the injection molding die of the present invention. In FIG. 2, the injection molding die 20 has a structure in which a fixed die 21 is attached to a fixed side attachment plate 22. A sprue bush 23 is provided in the center of the fixed die 21 and the fixed side attachment plate 22 so as to be fitted to the fixed die 21. A fitting portion 23a with which a nozzle (not shown) of the injection molding machine abuts is provided at the tip of the sprue bush 23.

An enlarged diameter portion 23b is provided on the tip side of the sprue bush 23, and a locate ring 24 is provided on the outer peripheral portion of the enlarged diameter portion 23b. The inside diameter portion of the locate ring 24 is The sprue bush 23 is slidably fitted in the enlarged diameter portion 23b.

On the tip end side of the locate ring 24, a plurality of concentric circular step portions 24a whose diameters are sequentially expanded outwardly.
Is provided. The stepped portion 24a is provided with its diameter determined so as to be compatible with several types of injection molding machines used.

A gap is provided between the rear end surface of the locate ring 24 and the contact surface of the fixed die 21 with the fixed-side mounting plate 22, and the locate ring 24 is pressed forward by the fixed die 21. Thus, the spring 25 is fitted and provided. Therefore, the locate ring 14 is always pressed forward by the spring 25, but when pressed by the injection molding machine side, the inner peripheral surface of the locate ring 14 smoothly moves along the outer peripheral surface of the sprue bush 13. It can slide and retreat, and even in the positioned state, the repulsive force of the spring 25 can always keep the pressed state on the injection molding machine side.

By the movement of the locate ring 24 in the front-rear direction, the position with respect to the injection molding machine of the other party is determined together with the corresponding outer diameter portion of the step portion 24a, and the sprue bush 2 is formed.
The nozzle of the injection molding machine is accurately fitted to the fitting portion 23a at the tip of No. 3, so that the molten resin can be reliably injected into the mold.

[0019]

EFFECTS OF THE INVENTION In the injection molding die of the present invention, a concentric circular step portion whose diameter is gradually expanded outward is provided on the tip end side of the locate ring, and it corresponds to a plurality of types of injection molding machines. It is possible, and since this locate ring can be moved back and forth in the direction parallel to the sprue bush, the nozzle of the injection molding machine can be positioned accurately.
Even if the injection molding machine used is changed, it is not necessary to replace the locate ring, and productivity can be improved. Therefore, it is suitably used as an injection molding die.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an injection mold according to the present invention.

FIG. 2 is a cross-sectional view showing another example of the injection molding die of the present invention.

[Explanation of symbols]

 10, 20 Injection molding mold 11, 21 Fixed mold 12, 22 Fixed side mounting plate 13, 23 Sprue bush 13a, 23a Fitting portion 13b, 23b Expanded diameter portion 14, 24 Locate ring 14a, 24a Step portion 14b Screw 25 spring

Claims (1)

[Claims] 1. A fixed side mounting plate is abutted and fixed to a fixed die, and a sprue bush and a locate ring are fitted between the sprue bush and the fixed side mounting plate. In the injection molding die, a concentric step portion whose diameter is sequentially expanded outward is provided on the tip side of the locate ring, and the locate ring is movable back and forth in a direction parallel to the sprue bush. A mold for injection molding characterized by being made.