SU552204A1 - Casting form - Google Patents

Description

one

This invention relates to the field of plastics processing into products.

A casting mold is known, containing intermediate and support plates, inserts that define the inner undercut and the middle liner placed between them.

A disadvantage of the known form is the complexity of its design and the impossibility of producing an external undercut on the product.

The closest technical solution to the one described is a casting mold, containing an intermediate plate and a supporting plate rigidly connected with it, and a pusher plate with a collet installed in it for shaping an internal undercut, interacting with a unclamping rod fixed to the base plate.

A disadvantage of the known form is that it does not ensure the production of undercuts on the product simultaneously from the outer and inner sides.

The purpose of the invention is to provide receiving undercuts on the product from the outer and inner sides simultaneously.

The goal is achieved by the fact that the form is provided with a collet fixed on a plate by a collet that forms the outer undercut, mounted concentrically with the collet,

decorating the internal undercut, and a unclamping element fixed in the form of a plate with profile stops placed between the collets and interacting with them fixed in the intermediate plate.

FIG. 1 shows a longitudinal section of a mold with different positions of the collets, the left half-form in a closed position, half the right - the form in an open position; in fig. 2 is a section along A-A in FIG. 1 (on an enlarged scale).

The mold comprises sections of the collets 1 for forming an undercut on the outside of the product and sections of the collets 2 for forming an undercut on the inside. Between the collets 1 and 2 are placed profile stops 3, which are placed on the plate 4, rigidly fixed in the intermediate plate 5. The profile stops serve to open the sections of the outer collets. The outer collet sections 1 are hinged to the plate 6 of the pusher 7 by means of half-rings 8. The inner collets 2 are fixed pivotally to the 9 of the pushers by means of half-rings 10. plate 12. In the middle part of the outer collet section 1 is made on the inner side of the recess 13, and the inner collet - recess 14, interacting with the lugs 3 when pushing products. The collet 2 houses spreading rods 15, which are rigidly fixed in the base plate 16. The rods 15 are hollowed with protrusions 17 separating the shaping parts of the sections of the inner collets 2. The protrusions 17 form gaps between the sections of the inner collets 2 when pushing the products.

The rods 15 are made to supply compressed air to a channel 18 connected to a spool device 19.

Between the plates 5 and 16 are placed racks 20, which determine the magnitude of the stroke of the collets. A punch 22 and a sprue bushing 23 are embedded in the fixed plate 21, and an ejector 24 of the sprue 24 is fixed in the plate 6.

Casting form works as follows.

After injection of the melt and the corresponding shutter speed, the movable half-form, bounded by plates 12 and 16, moves away from the fixed half-form. At the same time, the sections of the outer and inner collets are securely held in the movable half-form by a wedging cone 11. Upon further movement of the movable half-form, the pusher 7 encounters the stop of the injection molding machine, and the system of plates 6 and 8 begins to move. The sections of the outer collets 1 and the inner collets 2, pushing against the stops 3, begin to deviate from the products. In this case, the sections of the outer collets 1 deviate from the center, and the sections of the inner collets 2 approach each other. At the end of the movement of the plates 6 and 9, the spool device supplies compressed air to the channels 18 to remove articles from the injection mold.

Claims (1)

Invention Formula Casting mold containing intermediate plate and rigidly connected support plate of the pusher with the collet installed in it for forming an internal undercut, cooperating with a unclamping rod fixed to the base plate, characterized in that, in order to ensure that the undercuts on the product from the outside and the inner sides at the same time, it is provided with a pusher-mounted collar, which forms an external undercut, is mounted concentrically with a collet, which forms an internal undercut, and is fixed in intermediate plate unclenching element, made in the form of a plate with specialized stops placed between the collet and interacting with them. 22 21 r //// /// 7 / : №18