SU1222409A1 - Injection mould for die casting of externally threaded articles - Google Patents

Description

This invention relates to an injection molding of castings with threads on an external surface.

The purpose of the invention is to increase productivity.

FIG. 1 shows the mold in the closed position, the cut; in fig. 2 shows section A-A in FIG. one; in FIG. 3, node I in FIG. one; figure 4 is the same, when the open mold.

The mold contains stationary 1 and movable 2 half-molds, in which the matrix 3 with inserts 4 defining the external thread on the casting 5, the node 6 with spring 7 mounted on the base plate 8 by means of the plate 9 and the adjusting bolts 10 pushing plate are placed. 11 with a tubular 12 and a cylindrical 13 pusher placed between the backing 8 and the supporting 14 plates. The inserts and 4 are rotatably mounted in ball bearings 15

The mold works as follows.

After the metal is poured and pressed in, the mold half 2 moves to the left, the spring-loaded stop 6 releases the movable liner 4 from the forces of friction and, moving it forward within the support 15, the ejector plate 11 with the tubular 12 fixed in it and the cylindrical 13 pushers in contact with the stops installed on the machine cast under pressure, while the pushers 12 and 13 move the casting progressively.

In the process of translational movement of the casting, the threaded insert is rotated in the width support 15 under the action of ejection forces by an angle equal to the angle of inclination of the thread, and

casting out of the liner.

When the mold is closed, the movable half-form 2, in contact with the fixed half-form 1, returns the contribution 1 to the initial position,

Thus, external threading takes place without the use of removable inserts, thereby eliminating the process of screwing the insert from the casting after removing it from the mold and inserting it into the mold.

The invention makes it possible to increase the productivity of the press-form.

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Compiled by A. Kuznetsova Editor I. Derbak Tehred M. Morgental Proofreader G. Reshetnik

Order 1646/11 Circulation 757Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Rauschska nab., d, 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Claims (2)

1. PRESS FORM FOR PRESSING CASTING WITH EXTERNAL THREADS, containing a movable half-mold with a die, an insert forming the thread on the casting, a core, a backing plate and an ejector plate with pushers, and a fixed half-mold, characterized in that, in order to increase productivity , the liner is mounted rotatably in a ball bearing. 2. The mold according to claim 1, characterized in that it is equipped with a spring-loaded stop fixed in the underlay plate and interacting with the liner. < FIG. 1