SU1426819A1 - Injection mould for making plastic articles with undercut portions - Google Patents

Abstract

The invention relates to the field of plastics processing and can be used in the manufacture of parts with undercuts. The goal is to provide the necessary conditions for mechanized removal of ejected parts by automatically removing them from the semi-matrix and keeping them in a strictly oriented position. For this purpose, in the movable plates of the ejecting system coaxially with the designating sign 2 of the punch I, a clamp 16 is installed. Moreover, the cross section of the clamp 16 is smaller than the cross section of the design mark 2. 3 Il.

Description

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The invention relates to the processing of plastics and can be used in the manufacture of parts with undercuts. . The aim of the invention is to provide the necessary conditions for the mechanized removal of ejected parts by automatically removing them from the semi-matrix and keeping them in a strictly oriented position.

FIG. shows the mold in a closed position; figure 2 - the same, in the open position; Fig.3 section aa in Fig, 1.

The mold contains a punch 1 with the registration sign 2, composite semi-matrix 3, mounted for movement along the guides 4, semi-matrix holders 5, interconnected by means of guide columns 6, and an ejector system made in the form of plates placed in plate 7 pushers 8, intermediate plate 9, base plate 10, stops 11, pressed into bottom plate 12, and stem 13. Plates 14 and 15 are placed between plates 12 and 10.

A stopper 16 is installed in the plate 14, and a rod 13 is screwed into the plate 15. In plates 7, 9 and 10, the rods 17 and 18 are rigidly fixed, one end of which is mounted on the guide column 6, and the other end is fitted with a stop 19.

In the working cavity fall asleep press material, Smyk) from the half-form. After exposure to pressure, the mold is opened.

The ejecting system is turned on and using the brush 13, the plates 14 and 15 are moved together with the clamp 16. Since the cross section of the clamp 16 is smaller than the cross section of the registration mark 2, it freely enters the hole 20 of the pressed part 21, Then, when the plate 14 touches with the plate 10, the ejectors 8 are set in motion. With the help of t g 17, 18 and guide columns 6 1, the drive of the half-matrix 3 releases the pressed parts 21 held by the latches 16.

A puller (not shown) is automatically inserted into the working area and the pressed parts 21 are removed with its help.

Return the ejector system to its original position. Under the influence of the rod, the plates 14 and 15c are moved with the latch 16, Then, when choosing the free stroke, the plate 15, resting against the stopper 19 tons g 17 and 18, moves the latter together with the plates 7-10 and the ejectors 8. At the same time, the semi-matrix 3 , moving along the guides 4, are closed, and the plate 10 together with the plates 7, 9 abuts against the stop II.

Then the cycle repeats.

Thus, the introduction into the moving plates of the ejector system with the design- ing of the latch sign, the cross section of which is smaller than the cross section of the lamellar sign, ensures the necessary conditions for mechanized removal of the ejected parts by removing them from the semi-matrix and keeping them in a strictly oriented position

Claims (1)

Invention Formula A mold for the manufacture of parts with plastic undercuts containing a punch with a decorating sign, composite semi-matrices, a semi-matrix holder and an ejector system, characterized in that in order to provide the necessary conditions for mechanized removal of a group of ejected parts by automatically removing them from semi-matrices and holding in a strictly oriented position, in the movable plates of the ejector system, a lock is installed coaxially with the punch sign, Фа.2. Fird