SU1058712A1 - Mould for low-pressure die casting - Google Patents

Abstract

LOW-PRESSURE CASTING FORM With a two-stage ejection system containing a fixed half-form and a movable half-form including a stop plate, a mounting plate, a removable plate of the first ejection stage and pushers of the second ejection stage installed movably relative to the removable plate, there is a moving a-layer that, in order to increase the force of the ejection of the casting, it is equipped with an abutment fixed to the removable plate and a lever pivotally mounted on the plate, fastening with the possibility of interaction with the abutment plate minutes, stop and second stage jacks. | (L with el 00 ND

Description

FIELD OF THE INVENTION The invention relates to foundry and concerns the design of casting under low pressure.

A known die casting form, comprising upper and lower mold halves and a two-stage ejection system, in which the second pair of ejectors is inclined with respect to the main ejector and does not come into contact with the liquid metal, which increases tool life. At the first stage, the main ejectors remove the casting from the working cavity of the mold. Additional pushers also move in this way, but not income t to the casting. In the second stage, only inclined ejector moves, removing the casting from the main ejector.

A design flaw is the need to use a separate hydraulic drive for additional ejector, which complicates the shape design.

Closest to the invention is a die-casting form with a two-stage ejector comprising movable and fixed half-molds. The movable half-form includes a stop plate, a fastener plate, a removable plate, a pusher plate with columns fixed to it, and a second push ejector pusher to move this pusher relative to the removable one. the stove. It has bushings that interact with the columns; in this case, special figured grooves are made in the columns and bushings, periodically interconnected by a transverse pin. During the first ejection stage, the hydraulic cylinder is moved as a single removable plate with the pusher. During this period there is a uniform removal of the casting with a rod with a removable plate, which prevents the deformation of the casting. To remove the casting from the removable plate by the pusher, a slight force of 2j is required.

This form design does not provide when pushing out the casting of any gain in strength: the pushing force is always equal to the force developed by the hydraulic cylinder. And since in the case of low-pressure casting, the movement of the upper plate with the half-form and the pushing out of the last casting is carried out by a single hydraulic cylinder, this leads to an increase in the size of the hydraulic equipment and the drive power.

The purpose of the invention is to increase the force of ejection of the casting from the upper mold half.

The goal is achieved by the fact that the low-pressure casting form with a two-stage ejection system, comprising a stationary half-form and a movable half-form including an abutment plate, a fastening plate, a removable plate of the first ejection stage and pushers of the second ejection stage, mounted movably relative to the removable plate, is equipped with an abutment fixed on a removable plate, and a lever pivotally mounted on a mounting plate with the ability to interact with the support plate, the stop and the pushers of the second stage.

FIG. 1 shows the proposed mold for casting under low pressure, a section J in FIG. 2 - the form at the time of ejection of the casting.

The form contains a movable and fixed half-form. On the bottom plate 1, the fixed half-form 2 is fixed. The upper mobile half-form consists of an anvil plate 3, a fastening plate 4 with a core 5 fixed on it, a removable plate b with an anvil 7 fixed on it, and pushers 8 moving relative to the fastening plate 4. Brackets 9 are mounted on the fastening plate 4 with levers 11 fixed on the axis x 10, which interact when ejecting the casting 12 with the support plate 3.

The operation of the form is carried out as follows.

In the initial position, the form is closed. Removable plate with stops and movable pushers 8 are in the extreme upper position. Lever 11 lifts and rests on stop plate b. There is a gap between the lever 11 and the movable pushers 8.

After filling the mold with the melt and solidification of the casting 12 plate

4 fastening together with the rod 5, the removable plate 6 and the casting 12 goes up to the car plate 3 and then the lever 11 begins to act on the stops 7 and in the removable plate 6. The removable plate B starts to push the casting 12 off the rod

5 with a force greater than the force of the hydraulic cylinder in the ratio of the arms of the lever. At the same time, moving pushers 8 move downwards. After removal of the casting, a removable plate

6 takes the lowest position of the rod. In this case, due to the change in the spatial position of the stops 7 and the movable pushers 8, the lever 11 acts only on the movable pushers 8. The force of the pushes of the casting from the removable plate is already much less than in the case of pushes from the rod 5. After removing the casting and closing the half-forms, it is removable plate

and movable followers come to their original position.

The invention makes it possible to increase the force of ejection of castings and, consequently, to increase the dimensions of the molded parts, as well as to use hydraulic cylinders with meniii, which greatly simplifies the design of installations and equipment.

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FIG. g

Claims (1)

LOW-PRESSURE CASTING FORM with a two-stage ejection system, comprising a fixed mold and a movable mold including a thrust plate, a mounting plate, a removable plate of the first extrusion stage and pushers of the second extrusion stage mounted movably relative to the removable plate, distinguishing - with the fact that, in order to increase the ejection force of the casting, it is equipped with a stop fixed on a removable plate, and a lever pivotally mounted on the plate, fastening with the possibility of interaction with the stop plate , emphasis and pushers of the second step.