SU147754A1 - Mold for processing thermosetting polymeric materials by injection molding - Google Patents

Description

Molds for the processing of thermosetting polymeric materials by the method of injection molding, consisting of a material plunger fixed on a heating plate, a body having a conical boring in the pentral part, which includes inserts forming the working cavity of the mold, guide column, Traverses with pushers located at the bottom of the electrical heating housing are known.

However, existing injection molding mold designs require manual assembly and disassembly of mold parts in the workplace.

For mechanization and pressing, the crucible of the mold is rigidly fixed on a rotary column associated with a cross-beam ejector system having a mortise groove, the side surfaces of the groove engaging with the roller, the axis of which is fixed to the mold body.

The proposed mold design with a rotary crucible can be used in enterprises processing polymeric materials.

FIG. 1 shows the proposed mold; in fig. 2nd, section A-A in FIG. one.

The mold consists of a piston / with a heating plate 2, for which it is attached to a movable plate 3 of the press, a rotary crucible 4 and a rigidly connected column 5 with a screw groove, which includes a roller 6 with an axis fixed in the housing 7; the column 5 and the locking column 8 at the bottom are connected by a traverse 9: locking is rigid, the column with a screw groove can be rotated. The yoke 9 on which the followers 10 are mounted is connected to the shank 11 of the press ejector. Bark No. 147754, - 2, the start 7 has a tapered bore and grooves of the dovetail type, with which the wedge liners 12 are connected, and with them the liners 13, the design of the product 14. The lower part of the liners rests on the disk 15. The stops 16 help to keep the liners in the housing at the time of the release of the gate.

The central rod 17 serves for ophiating through-hole articles, if necessary.

The body and piston are heated by tubular elements 18 mounted vertically. The mold works as follows.

After a predetermined time delay has elapsed, the movable plate 3 with the piston is retracted upwards. Along the passage of a plate of a certain distance, the ejector of the press automatically turns on, which raises the crucible through the traverse and the columns.

With a small course of the crucible upwards, the sprue is separated from the product and the fixed part of the crucible is withdrawn from the inserts.

Upon further lifting, the pushers rest against the disk 15, raising it upwards.

The disc acts as a product puller and simultaneously lifts the liners, which slid along the grooves to the sides.

The rotation of the crucible when lifting occurs automatically, as a result of which access is opened for the removal of the product from the mold.

After the product is removed, the liners are blown through the air and the sprue is removed from the crucible.

After cleaning the mold, the ejector descends. The crucible automatically rotates, lowers and closes the mold. Simultaneously, the inserts are lowered. At the end of the course the crucible reliably closes the liners of the form.

A previously heated press material is put into the crucible and the movable plate of the press is turned on at the closing.

Punch, lowering, presses the press material from the crucible into the mold cavity.

After the required holding time, the cycle is repeated. In some cases, if necessary, the automatic rotation of the crucible should be replaced with a manual one, for which you need to remove your finger from the rollers.

Subject invention

A mold for processing thermosetting polymeric materials by the method of casting under pressure consists of a material plunger mounted on a heating plate, the body having in the central part a tapered bore, which includes inserts forming the working cavity of the mold, the guide column, traverse with pushers located in the lower part of the electrical heating body, characterized in that, in order to mechanize the process of pressing, the crucible of the mold is rigidly fixed on the rotary column associated with a cross-beam ejector system having a helical groove, the side surfaces of the groove engaging with a roller, the axis of which is fixed to the press: form.