SU1500493A1 - Casting mould for making polymeric articles - Google Patents

Abstract

The invention relates to the processing of plastics into products. The purpose of the invention is to simplify manufacture and increase the reliability of the mold. The casting mold contains a fixed plate 1, decorating plate 2 with sockets 3, a gating system 4 with tunnel channels 5 and inlet holes, an ejector block with plates 7 and 8 containing ejectors of products 9 and a sprue 10. The axis of the tunnel channel 5 passes outside the side the surface of the socket 3, the lateral surface of the tunnel channel 5 intersects the lower edge of the lateral surface of the socket 3.1 Cp. f-ly, 2 ill.

Description

G5 .164.15

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(L

31500

The invention relates to the processing of plastics by injection molding and can be used in the manufacture of injection molds with tunnel sprues.

The purpose of the invention is to simplify the manufacture of polymer products with tunnel sprues and increase reliability. .

Figure 1 shows a part of the mold before opening, a section; Fig. 2 shows a fragment of the decoration plate at the junction of the tunnel channel with a socket, a section;

The stationary plate 1 and the decoration plate 2 delimit the sockets 3 and the gating system 4 with tunnel channels 5 and inlet holes 6. At the same time, the axis A of the tunnel channel 5 passes outside the lateral surface of the socket 3 so that the continuation of the bisector B of the angle formed The surfaces of the tunnel channel 5 at the inlet 6, constitute, if possible, a small angle ti with the side surface of the nest 3. Under the decoration plate 2, the ejector unit is mounted for axial movement of the ejectors with plates 7 and 8 in which they are installed in The pushers of the products 9 and the ejector of the sprue 10. The ejectors 9 and 10 pass through the holes in the decorating plate 2, with

This end of the ejector 10 is located under the center of the gating system 4, the end of the ejector 9 is flush with the bottom surface of the nest 3, and its side surface flush with the side of the nest 3 directly at the inlet 6. On the side opposite to the ejector 9 and 10, a pusher unit is equipped with a shank 11 with a spring 12 located between the collar of the shank 11 and the mounting plate 13. As the casting mold is shown after melt injection, the products 14 are in the slots 3 before opening, Ikovy system 4 - distributing sprues 15, In tunneling channels 5 - sprues spacing 16.

Casting form works as follows.

The molten alloy of the elimer, which has passed through the gating system, enters the tunnel channel into a closed injection mold.

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4, the axis A of which extends outside of the socket 3, the lateral surface intersects the lower edge of the socket 3, forming the inlet 6, and the recessed end extends into the ejector hole of the product 9 and overlaps with the lateral surface of this ejector. The melt jet passing through the inlet 6 at an angle of 45 hits the face of the nest 3 and, expanding from the impact, fills the nest evenly 3. After the end of the exposure, the fastening plate 13 carrying the moving parts of the mold and the casting moves away from the stationary plates 1. Upon further movement, the shank 11 reaches the stop on the injection molding machine (not shown), which causes the pusher block to stop - plates 7 or 8 with fixed between –the two ejectors 9 and 10 and the 14 and sprues lying on them . Due to the continuation of The stroke of the decorating plate 2 of the ejector 9 pushes the products .14 out of the sockets 3, cutting off the tunnel sprues 16 from the products 14, and the ejector 10 removes the distributing sprues 15 with the tunnel sprues 16, respectively, from channels 4 and 5, then the products 14 and the sprues 15 fall into their designated receivers. In the reverse movement of the moving casting parts, the spring 12 returns the ejection unit to its original position and after the trimming of the molding plate 2 with the fixed plate 1 is closed, the casting cycle ends.

Claims (2)

1. A mold for the manufacture of polymer products, comprising a decoration plate with sockets, a runner system with tunnel channels, an ejection unit with product and gate pushers, characterized in that, in order to simplify manufacture and increase the reliability of the mold, the axis of the tunnel channel is located outside the side surface of the nest, and the side surface of the tunnel channel is outlined intersecting the lower edge of the side surface of the nest. 2. The casting mold according to claim 1, o t is distinctive with that, s In order to simplify the tunnel channel, its recessed end is positioned in the hole to push the product so that the side surface of this tiller can be blocked. fe.z