Maintaining dies in an injection press parallel to each other

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...

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Details

26432811, 425149, 425150, 425575, 425592, 425595, B29C 4580

Patent

active

051961504

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an injection press device and a forming method therefor, and, more particularly, to an improvement in an injection press device and a forming method therefor capable of satisfactorily maintaining the parallelism of dies at the time of die clamping work.


BACKGROUND ART

Hitherto, as a method of determining the compression stroke for clamping the die at the time of injection press forming and injection compression forming, there has been (1) a structure as disclosed in Japanese patent Laid-Open No. 58-167132, Japanese Patent Laid-Open No. 58-167137 and the like in which it is determined by inserting a key between a moveable plate and an end plate or between a fixed plate and a moveable plate, and (2) a structure as disclosed in Japanese Patent Laid-Open No. 60-179218, Japanese Patent Laid-Open No. 60-37297 and the like in which a positioning cylinder is provided between the moveable plate and the fixed plate so that it is determined by the cylinder stroke.
However, according to the above-described structures, only the compression stroke is determined and means to maintain the parallelism between the dies has not been described. As for the parallelism of the dies, parallelism from the compression starting point becomes critical in injection press forming in which the compression stroke is relatively large with respect to that in injection compression forming. If satisfactory parallelism cannot be realized, the action of the molten resin is influenced, causing the quality of the product to become unsatisfactory.
Accordingly, an object of the present invention is to provide an injection press device and a forming method therefor capable of realizing a satisfactory die parallelism and from which products of good quality can thereby be obtained.


DISCLOSURE OF THE INVENTION

In order to achieve the above-described object, an injection press device according to the present invention is characterized by: a fixed die plate supporting a fixed die; a moveable die plate supporting a moveable die which is brought into contact with the fixed die and moved away from the same to a compression start position by liquid pressure means; an injection mechanism for injecting molten resin into a cavity formed by joining the two dies; mechanical positioning means fastened adjacent to the fixed die plate for the purpose of restricting the return movement of the moveable die plate at a compression starting position during a stroke of the moveable die plate; an adjuster fastened adjacent to the fixed die plate for adjusting the height of the mechanical positioning means and adjusting the parallelism of the moveable die plate; compression liquid pressure means, provided independently from the liquid pressure means, for the purpose of moving the moveable die plate from the compression start position towards the fixed die plate; a servo valve for controlling the quantity of operating fluid to be supplied to the compression liquid pressure means; a position sensor for detecting the position of the moveable die plate; and control means for adjusting the degree of opening of the servo valve connected to the compression liquid pressure means in accordance with the result of detection performed by the position sensor.
According to the above-described structure, during the stroke of the moveable die with respect to the fixed die, the moveable die is first moved to a required opening degree by a lift cylinder or the like, and it becomes the compression starting position. At this position, the mechanical positioning means is operated and the moveable die plate is maintained at the compression starting position. After the above-described maintaining operation performed by the mechanical positioning means, the adjuster is operated so that the height of the mechanical positioning means can be adjusted. Since the mechanical positioning means influences the parallelism of the moveable die plate, the moveable die plate can be finely adjusted by properly operating the adjuster. Thus, the rearward mo

REFERENCES:
patent: 3669599 (1972-06-01), Snider et al.
patent: 4519763 (1985-05-01), Matsuda et al.
patent: 4747982 (1988-05-01), Nakatsukasa et al.
patent: 4917840 (1990-04-01), Harada et al.
patent: 4923383 (1990-05-01), Kurumaji et al.
Patent Abstracts of Japan, vol. 9, No. 316 (M-438)(2039), published Dec. 12, 1985, for JP (A) 60-151015.
Patent Abstracts of Japan, vol. 12, No. 201 (M-707)(3048), published Jun. 10, 1988, for JP (A) 63-005919.
Patent Abstracts of Japan, vol. 14, No. 26 (M-921)(3969), published Jan. 18, 1990, for JP (A) 1-264823.

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