SU1523373A1 - Casting mould - Google Patents

Abstract

This invention relates to the manufacture of plastic products. The purpose of the invention is to prevent sticking of the products on the ejector. In an injection mold containing a fixed half-mold 1 and a movable 2, comprising a die plate 3 with die 4 having holes 5 for ejectors, a backing plate 6 with holes 7 for ejectors, large holes 5 for die ejectors equipped with a lead-in face 8, and a plate ejectors 9 with ejectors 10 movably mounted therein, including a working part 11, a transitional part 12, a rod 13, a tapered part 14, a thickened part 15 and a shoulder 16, holes 7 of the base plate 6 are offset relative to the holes 5 of the dies 4, and the tapered part 14 pushers 10 are made interacting with the lead-in chamfer 8 of the holes 7 of the backing plate 6 and placed therefrom a distance smaller than the height of the resulting product 17. When the product 17 is pushed out, the taper part 14 of the ejector 10, interacting with the lead-in face 8 of the hole 7 of the backing plate 6, moves ejector relative to the product obtained 17. 3 Il.

Description

The invention relates to the production of plastic injection molding.

The purpose of the invention is to prevent the products from sticking on the pushers.

FIG. 1 shows a casting form in a closed state, a longitudinal section; in fig. 2 - the same at the time of the form connector; in fig. 3 - the same at the end of the cycle.

Casting form contains a fixed half-form 1 and a movable half-form 2, which includes a plate of matrices 3 with matrices

4, having openings 5 for ejectors, backing plate 6 with openings 7 for ejectors, for openings

5. Holes 7 are equipped with a lead chamfer 8. In addition, the movable mold 2 is equipped with a pusher plate, 9 with pushers 10 movably mounted in it, including a working part 11, a transition part 12, a rod 13, a tapered part 14, a thickened part 15 and a shoulder 16. The holes 7 of the backing plate 6 are offset relative to the holes 5 of the dies 4 by the amount / 1, and the tapered part 14 of the ejectors 10 is made cooperating with the lead-in chamfer 8 of the holes 7 and is placed at a distance / 2 less than the height / 3 of the resulting product 17.

Casting form works as follows.

After the injection of the polymeric material and the required holding time, the mold is opened, during which the movable mold 2 is separated from the fixed mold 1. The pusher plate 9 stops and mold 2 continues to move. When this occurs, the product 17 is pushed out of the matrix 4, fixed in the plate of the matrix 3, during which the distance / 2 between the tapered part 14 of the ejector 10 and the lead-in

0

five

0

five

the chamfer 8 of the hole 7 is reduced to zero. Since the hole 7 of the backing plate b is displaced relative to the hole 5 of the matrix 4, the conical part 14, interacting with the lead chamfer 8, causes the ejector 10 to move in the plate of the ejectors 9. Due to the fact that the conical part 14 is located at a distance / 2 less than the height / 3 of the product 17, the working part 11 of the ejector 10 moves relative to the product 17, thereby preventing the products from sticking on the ejector. When closing the half-form plate ejector 9, the impact on the collar 16, returns the ejector 10 to its original position. When this transition part 12, interacting with the matrix 4, moves the ejector 10 so that its working part 11 enters the hole 5, made in the matrix 4.

Claims (1)

Invention Formula A mold, containing a stationary half-form and a movable one, comprising a matrix plate with matrixes having openings under the ejectors, and a backing plate with openings under the ejectors, which have openings under the ejectors of the matrix, made with a lead-in chamfer, an ejector plate with movably installed ejectors in it, having a working and transitional part, a rod, a tapered and thickened part and a collar, characterized in that, in order to avoid sticking of the products on the pushers, the holes of the backing plate are offset by in relative apertures matrices and tapered part of the ejector is adapted to cooperate with a lead-in beveled openings and the skid plate is placed on it at a distance less than the height of the cavity. / J; 2 In Yu 8 6 7 5 / 5/5 1 / J / 2 Fig.