JPS61120711A - Insert fixing device - Google Patents

Abstract

PURPOSE:To simplify the structure of a device and to improve its accuracy by setting an O-ring in the little clearance provided between the diameter of round holes formed in a template and the outer diameter of an insert, while positioning said O-ring at the round hole part of the template. CONSTITUTION:An O-ring 23 is inserted into the round hole of the first plate 11. Even if difference occurs at the pitch accuracy of a plurality of round holes formed in the first plate 11 at the state where a mold is assembled, the first insert 14 is movable slightly due to a clearance 18 and the O-ring 23, and is capable of absorbing the contacting pressure between the second insert 15 and butting parts 16, 17, when the mold is closed. Because the central axis 21 of the first insert 14 may be automatically caused to coincide with the central axis 22 of the second insert 15, the accuracy of the assembled state of the mold may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an insert fixing structure for incorporating and fixing a cylindrical insert into a mold for molding high-precision resin products. The problem with the conventional insert fixing structure is to insert and fix the first insert 4 into the first template 1, as shown in specific examples in FIGS. 1 and 2. In such a configuration, the first
Due to variations in the pitch accuracy of the plurality of round holes x1 to X8 machined on the template 1 and variations in the pitch accuracy of the plurality of round holes machined on the second template 3, Central axis 11 of the first insert 4 and central axis 12 of the second insert 6
As a result, the abutment portions 6.degree.7 of the first insert 4 and the second insert 5 also differ in contact. As a result, the dimensional accuracy of the molded product decreases, and the difference in contact strength between the abutting portions 6 and 7 causes cracks and wear of the mold.

This caused damage, which caused problems in terms of molded product quality control and mold management.

OBJECTS OF THE INVENTION The present invention is intended to eliminate the above-mentioned conventional drawbacks, and aims to simplify the configuration and improve accuracy.

Structure of the Invention The insert fixing structure of the present invention is such that a slight gap is provided between the diameter of the round hole machined in the template and the outer diameter of the insert. Q IJ songs are installed, and variations in pitch accuracy of multiple round holes machined in the template can be absorbed by the gap and the Q-ring, simplifying the overall configuration and improving molded product quality control. This is extremely advantageous in terms of mold management.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, 11 is a first plate with a plurality of round holes, 14 is a cylindrical first insert, 16 is a second insert, 18.17 is an abutting portion between the first insert 14 and the second insert 15, 18 is the first plate 11
and the first insert 14, a slight gap 21
is the central axis of the first insert 14, and 22 is the central axis of the second insert 16. A circle ring 23 is inserted into the round hole of the first plate 11.

In the assembled state of the mold, even if there are variations in the pitch accuracy of the plurality of round holes machined in the first plate 11, the gap 18 and the O-ring 23 will ensure that the first The insert 14 is slightly movable and can absorb the difference in contact strength between the abutting portion 16 and the second insert 16 in the mold closed state, and
Since the center axis 21 of the insert 14 can be automatically aligned with the center axis 22 of the second insert 15, the accuracy of the mold assembly can be improved.

Effects of the Invention As described above, in the present invention, when fixing the cylindrical first insert to the round hole machined in the plate, a slight gap is provided and the elastic force of the O-ring is utilized, so that the mold In the assembled state, the center axis can be automatically aligned with the second insert, and the overall configuration can be simplified, which is extremely advantageous in terms of molded product quality and mold management.

[Brief explanation of the drawing]

The first factor is a partial cross-sectional view of a molding die with a conventional insert fixing structure, FIG. 2 is a partial cross-sectional view of the same plane, and FIG. be. 14...First insert, 18...Gap, 23...Q IJ ring, 17...
・Abutting portion, 21...First insert center axis, 1
1...First Great. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] In a mold in which a plurality of cylindrical inserts are assembled and fixed in a template, a slight gap is provided between the diameter of the round hole machined in the template and the outer diameter of the insert, and the template is designed to block this gap. Insert fixing device with an O-ring placed in the round hole.