SU897539A1 - Casting mould - Google Patents

Description

(3) CASTING FORM

one

The invention relates to the processing of plastics, and can be used for the manufacture of long products with complex undercuts and stiffeners.

A known casting mold for the manufacture of long hollow articles, comprising a movable and stationary half-mold, a pushing sleeve disposed on the mark, and a lever mechanism connected to the sleeve through ti ty strings.

However, the technological capabilities of this form are limited due to the impossibility of manufacturing products with complex undercuts and stiffeners.

A casting mold for the manufacture of plastic products is also known, which contains a fixed gating plate with formative signs fixed in it and sliding wedges.

interacting with semi-matrix, movable and base plates 2,

In this form, the disadvantage is the need to move the movable part to a distance equal to two product lengths and the length of the product holding rod, which leads to an increase in the duration of the operating cycle.

ten

The closest in technical essence and the achieved effect to the proposed is a casting mold containing fixed gating plate and matrix plate,

15 movable plate of punches and base plate and plates of an ejecting system placed between them with placed signs and concentrically mounted pipes on them

20 pushers. The ejection time of the product in a known form is determined by the duration of movement of the movable plate on the

Stand exceeding two product lengths 3.

The purpose of the invention is to increase the productivity of the form by reducing the time taken to push up the length of the long products.

This goal is achieved by the fact that the injection mold, containing a fixed gating plate and a matrix plate, a movable plate of punches and a base plate and interposing plates of an ejection system placed in them with arranged erecting marks and concentrically mounted tubular ejectors, is equipped with parallel toothed racks mounted on the ends of the tubular ejector and the registration mark placed on the plates of the ejector system and fixed on the base plate by gears, p laid between the racks and interacting with them. Figure 1 shows the mold, front view; figure 2 - section aa in figure 1; FIG. 3 is a section BB in FIG. - section B-B in FIG. 2 The press-form contains stationary gating 1 and matrix 2 plates, movable plate 3 punches with punch k and bonded intermediate plate 5, rigidly connected with support plate 6. Plates 7 and 8 of ejector system placed between the jurassic 6 and the movable 3 plates, which are in the initial position on the support plate 6. The possibility of their movement due to the interaction of the shank 9 with the stop of the drinking machine is provided by return columns 10. Between the plates 7 and 9, the sleeves 11 are fixed with the shoulders that end pushing out cars 12, and toothed rails 13, interacting through gears 1, mounted on an axle x 8 base plate, with toothed rails 15 of decoding marks 16. During the operation of the mold, after filling it with material, holding under pressure and cooling, a part is retracted from the fixed plate at a distance equal to the length of the product 17, increased by 0.0010, 002 m. At the same time, the product remains on sign 16 and punch 4 due to the wedge-shaped edges of the product.

When the shank 9 comes into contact with the support of the injection molding machine, it moves

relative to the base plate 6, while moving the plate 7 and and the mediocre sleeves P with clamps 12, equipped with toothed racks 13

By means of the latter, gear H is driven in, each of which imparts a translational movement opposite to the ejector movement according to the retract sign 16. After displacing the shank 9 fixed together with the plates 7 and 8 and the ejector 12 at a distance equal to half product length, the release of products is provided. When the mold is closed with the help of back columns 10, the moving parts of the transducer return to their original position.

The proposed mold allows you to increase equipment productivity by reducing the time to push long products.

Claims (3)

1. Authors certificate of the USSR (f, cl. In 29 C 5/00, 1979. 2. USSR author's certificate number 651968, cl. B 29 C 5/00, 1977. 3. Injection molds for thermoplastic parts. Directory reference. TsNIITEstroymash, M., 1978, pp.257-259, fig.176 (prototype).