SU772706A1 - Injection die for pressure-moulding - Google Patents

Description

one

The invention relates to a foundry, namely, injection molding of castings with undercuts, the axes of which are non-parallel to the movement of the half-mold, for example, the wheels of a turbo-5 press.

A known mold for casting under pressure castings with undercuts, containing a movable mold, 0 in which a mounting plate is installed, an intermediate plate with a forming central core, a removal plate with side sliders carrying form-forming rods, inclined wedges interacting with sliders, ejector plate. The removal plate is installed with the possibility of linear movement relative to the central rod and is connected by gahs to the ejector plate. Removing the side bars occurs simultaneously with the removal of the casting from the central core of the CZ.

The lack of press-fop 1s is 25 in the unreliability of removing the casting from the mold, since the ejection process depends on the shrinkage of the alloy. After the casting is cooled, it is pushed out by the end of the central rod. At 30

small values of the contact area of the casting and the rod, depending on the shrinkage factor of the casting material and with an increase in the ejection force, it is possible to deform the end of the casting and cleave the inner edge of the casting. It is also possible that the casting is seized in the mold. When casting slopes on the core, it is impossible to remove the casting at all. In addition, the central core in a known mold, when producing castings with significant tapering along its internal cavities, does not serve as a lock for the casting. As a result of various pressing forces of the side bars, the casting can move towards one of them, which leads to the deformation of the casting, distortion of the geometry.

The purpose of the invention is to increase the operational reliability of the structure.

The goal is achieved by the fact that the central rod is mounted with the possibility of axial movement.

FIG. 1 shows the proposed mold, a general view in section; in fig. 2 is the same in the open position, in FIG. 3 - movable half-form at the time of stopping the central rod; in fig. 4 - the same at the end of the pushing; in fig. 5 - view of the moving half-form.

The mold contains a stationary half-form comprising a plate 1 with an annular lock 2 and sleeves 3 fixed in it and a movable half-form including a shaping central core 4, inserts 5 forming the undercuts of the casting b connected by pins 7c. side sliders 8 moving in the guides 9 of the plate 10 with the sleeves 11 and with the ejectors 12, the plate 13 of the fastening with the wedges 14 and the guide columns 15 rigidly fastened with the base plate 16.

The mold works as follows.

In the closed state, the alloy is pressed into the mold through the hole in the ring lock 2 and, after the required technological time, the mold is opened. In this case, the movable half-form departs from the fixed one, at the end of which the drive gi, a chopper, rigidly connected to the ejectors 12 (not shown) is turned on. Ejectors 12 operate on. The removal plate 10 moving on the sleeves 11 along the guide columns 15. The side sliders 8, interacting with the wedge and 14 R with the rear fastening plate 13 of the fastening of the movable half-flange plate, move in the direction 9 of the removal plate 10, spreading out to the side associated inserts 5 , freeing the undercuts of the casting, and at the end of the pushing course, the side sliders 8 do not get out of engagement with the wedges 14.

The central rod-locking device 4, held by the force of reduction as a result of the shrinkage of the alloy, ensures fixation of the mold 6 during removal of the side sliders 8 until it stops

collar rod 4 in the bottom of the installation socket in the plate 13 of the mount. Upon further advancement of the plate 10 removal, the rod 4 stops and the casting is removed from it. B. When moving the ejector 12; Back, the movable half-form returns to its original position.

When the mold is closed, the guide columns 15, interacting with the bushings 3 and 3, fix the moving semi-form with respect to the stationary one. . Ring lock 2 provides a tight closure of the liners 5. The mold is again ready to press the alloy.

5 The invention makes it possible to increase the operational reliability, reduce the laboriousness of manufacturing by simplifying the design of the mold, and eliminate its failures due to the timely withdrawal of the rods from the side undercuts.

Claims (1)

1. USSR author's certificate No. 608605, cl. B 22 D 17/22, 1976. No. 10 S 9 (5ГЗ в / 5 / / / // itFig.