SU1296292A1 - Die mould for die casting with staight gate system - Google Patents

Abstract

The invention relates to foundry, in particular, to injection molding of castings produced in molds with a direct runner system. The aim of the invention is to simplify the design of the mold. For this, in the mold casting 12 and the central sprue 13 rasololaktz in detachable liners 6 installed in the fixed half-mold 2. The liners are made with a conical outer surface and guides. When opening the mold, the press piston 4 through the press residue 11 acts on the inserts 6, which, moving along the guides, open and release the casting together with the sprue and the press residue. This eliminates the need to use special means to separate the press residue from the casting when opening the mold. 2 Il. . (L tsD; about 05 th with s. 2

Description

And: 1 () The brend refers to the foundry and iroic properties, in particular to the injection molding / pl.жvvok, obtained in molds with a direct sping system.

The purpose of the invention is to simplify the design of the mold.

FIG. i shows the mold in the initial position before pouring the metal, general view; in fig. 2 shows section A-A in FIG. 1 (mold at the stage of release of the casting and gating system).

The mold contains movable 1 and fixed 2 half-molds. In the fixed mold 2, the pressing chamber 3 and the pressing piston 4 are installed. In the sliding mold 1, the insert 5 is fixedly fixed, forming the internal cavity of the casting. In the end sockets of the fixed half-form 2 there are installed split forming inserts b, having a conical outer surface.

The inner surface of the liner forms the cavity 7 of the casting and the channel 8 of the central sprue, the inlet of which can be located above the axis of the pressing chamber.

The liner is moved along the guides 9, made in the form of protrusions on the liners 6 and grooves in the fixed half of the mold 2, to the stops 10, made in the fixed half of the mold 2 and protecting the inserts from falling out when removing castings (Fig. 2).

In order to avoid the production of defective castings, the action of the pressurized core during the opening of the mold must cease at the moment of divergence of the insert by the value of the diameter of the press residue. This is achieved by the fact that the angle of inclination of the guides to the horizontal axis (a) is determined by the ratio of the diameter of the pressing force (Dn) to the output of the pressing force for the fixed plate of the masking plate (n). In practice, this angle is in the range of 10-20 °.

The mold works as follows.

The metal enters the working cavity of the mold through the channel 8 of the central runner gland, formed by inserts. After filling the working cavity. 7 metal and its crystallization is the disclosure of the mold. At the time of opening of the mold, on the moving mold 1, in addition to the force of opening the maschina, there is a force of the pressing press 4, transmitted through the press residue

 11 and inserts 6. The pressing bore 4 through the press residue 11 presses on the inserts 6, which are moved forward along the guides of the fixed half of the mold 2 up to the stop 10, freeing the casting 12 together with

5 sprue 13 and press residue 11. Further opening of the mold and removal of the casting takes place in the usual way.

The inserts 6 are returned to the initial position by the movable half-form 1 when the mold is closed.

0 Opening the liner under the pressure of the press through the press residue allows the casting to be released together with the gating system and press residue without separating it, which makes it possible to increase the cross-section of the central sprue and, consequently, improve the quality of the castings. The mold design is simplified due to the elimination of means for separating the press residue.

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Claims (1)

Invention Formula An injection mold with a direct-runner system comprising a movable half-form, a mold that forms the cavities of the casting and a central sprue, and a fixed half-form with an extrusion chamber and a compression mold, which in order to simplify the design, the matrix is made in the form of detachable liners with a conical outer surface and guide elements, with the liners mounted in a fixed half-form.  I Gee . :