SU1362644A1 - Casting mould for making polymeric articles - Google Patents

Abstract

The invention relates to injection molds for the manufacture of polymer products with simultaneous separation of sprues. The purpose of the invention is to increase the reliability of the form. For this, the gating plate 5 is located between the rows of the design elements 4, is made integral with the side, arranged on the side of the series of the design elements 4, parts in the form of strips 8, which are rigidly connected in pairs with the sliders 10, while the gating channels 11 in the laths 8 are made with sharp edges 12. When the mold is opened, the sliders 10 move by inclined columns 13, as a result of which the gates 8 separate the sprues. In the course of further unfolding, the pushers 17 remove the articles from the design elements 4, and the pushers 18 squeeze the sprues out of the springs in the sprue plate and together with the diluting sprues. 7 il. $ (L W 9 with O5 GhES 4 (Rig.2

Description

The invention relates to a tooling for processing plastics into articles by injection molding with mechanized separation of sprues.

The purpose of the invention is to increase the reliability of the form.

FIG. 1 shows the casting form, general view, section; in fig. 2 - movable part of the form, a view in the plan; in fig. 3 - form in the open position; in fig. 4 — bar for separating gates; in fig. 5 is a section A-A in FIG. four; in fig. 6 is a section BB in FIG. one; in fig. 7 - slider with fixed slats.

The mold for the manufacture of polymeric products contains a fixed one; a form consisting of a plate-matrix 2 attached to the base plate 1 and a movable half-form comprising a plate 3 with decorating elements 4 arranged in rows, a runner plate 5 with runner channels 6, located between the rows of ladies - the decorating elements and made composite with the side, arranged on the side of the rows, the decorating elements, in the form of slats 8 installed in the guide grooves of the 7 runner plate 8, rigidly connected with claimed in guides 9 of the same plate with the slides 10 and runner channels 11 with sharp edges 12.

Inclined columns 13, which interact with holes 14 made in sliders 10, are fixed on the fixed half-form. The mobile half-form has an ejector system in the form of 3 ejection plates 16 located between its base 15 and the plate 3 with 17 ejectors placed in through holes of elements 4, ejector 18 gates and shank 19.

Such a constructive solution makes it possible to exclude installation of spring-loaded gate pushers in the gating plate, which, in a known technical solution, do not provide reliable discharge of sprues due to the limited axial displacement. The limited movement of the ejector allows the ejection of the gating channels only those parts of the distributing sprues that are in contact with the ejector and areas close to the contact zone, therefore, due to the short stroke of the pushers, the sprue area is deformed, the ends of the gates separated from the product remain in the gates channels by retaining in them the undercuts of one of the walls of the distributing runner channels.

0

The form works as follows. Melt plastics served in the closed form. After appropriate exposure, the mold is opened, whereby the base 15 of the movable mold half together with the plate 3 and the casting plate 5 is retracted from the fixed mold half, and the decorating elements 4 with the cast products 20 arranged on them are removed from the matrix plate 2. With the casting plate 5, the central sprue with diluting sprues is also entrained due to the fact that it has retention sprues in it.

Choosing free travel in the hole x 14,

5 inclined columns 13 move the sliders 10 along the guides 9 of the gate plate 5 in the direction from the center of the form together with the strips 8. The shift of the bars 8 along the guide grooves 7 of the gate plate 5 ensures separation of

0 sprues from molded products 20 by cutting them with sharp edges 12 gating channels 11.

Upon further disclosure of the form, the sloping columns 13 are fully ejected.

5 from the interaction with the holes 14 of the sliders 10, and the ejection plates 16 by the shank 19, bumping against the support of the injection molding machine, are stopped and, through the holes in the design elements, 4 ejects 20

0 last. The ejector 18 gates sprues are extruded from the undercuts of the gating plate 5 and, together with the distributing sprues, of the gating channels are discarded.

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Claims (1)

Invention Formula A mold for the manufacture of polymer products, comprising a stationary half-form and a mobile half-form, including a plate with arranged rows of decorating elements, between the rows of decorating elements columns, an ejector system with ejection plates and ejector products and gates, characterized in that, in order to increase the reliability of the form, it is equipped with sliders with gusta under sloping columns 0, the plate is made of composite parts with side, arranged on the side of the rows of the forming elements, parts in the form of slats, which are rigidly connected in pairs with the sliders, while the gate channels with sharp edges are made in the slats. Phi2.1 eleven A-A TO 12 eleven Fig 5 5-5 FIG. 7