SU1165591A1 - Mould for making articles of polymeric materials - Google Patents

Abstract

Mold for the manufacture of plastics, comprising a fixed plate with the forming inserts, clip with jaws, the runner system to the intake runner and diluted conductive runner placed in the fixed plate in the mold parting plane, a pusher mounted on the plate ejecting and mounted with the possibility of contact with the ends of the semi-matrix to open them and move the first semi-matrix in the direction of the spreading gate channel, and the second in the opposite direction A sign, an intermediate plate and a support plate, characterized in that, in order to increase the quality of the products and simplify the form design in the manufacture of products such as screws, a groove with a pointed edge under the inlet runner is made on the end surface of the first half-matrix, located in inclined guide slots that are made in the cage.

Description

The invention relates to the processing of polymeric materials and can be used in mechanical engineering for the manufacture of articles of stepped shape with undercut on the outer surface of the type of screws.

The purpose of the invention is to improve the quality of products and improve the design of the form in the manufacture of products such as screws.

This goal is achieved by providing a slice of the gate at the opening of the form and the release of the product, while deforming the spreading sprues and removing them from the elements of the form.

FIG. 1 shows the casting mold in a closed position; la fig. 2 — node I in FIG. one; in fig. 3 - the casting mold, the plan; in fig. 4 shows section A-A in FIG. 3; in fig. 5 - casting form in the open position.

The casting mold contains a fixed plate 1-, in which the forming inserts 2 are fixed, which form the screw head, the holder 3 with the first 4 and second 5 semi-matrixes, the sprue system with the distributing runner channel 6 located in the molding mold connector , a pusher in the form of a detachment plate 7 mounted by means of a column 8 on an ejection plate 9 and mounted with the possibility of contacting the ends of semi-matrices 4 and 5 to open them and move them first and out of semi-matrices in the direction of the splitter the second channel 6, and the second half of the semi-matrix in the opposite direction, the sign 10, the intermediate 11 and the supporting plate 12 rigidly connected with it. On the end surface of the first 4 semi-matrices, a groove is made with the edge sharpened at an angle of 30-60 ° under the inlet sprue channel 13.

The angle of inclination of the end side of the groove 30-60 ° in the first 4 semi-matrix is selected from the condition of ensuring high-quality cutting and reliable operation. When the angle of inclination is less than 30 °, the cutting edge vykrashivatsya, at an angle of inclination greater than 60 °, the cutting edge may not completely cut off the sprue. The semi-matrices 4 and 5 are provided with fingers 14 placed in guides of the inclined grooves 15, which are made on the strips 16 of the holder 3. A sleeve 17 with a hook 18 is rigidly mounted on the holder 3.

Casting form works as follows.

After filling the molding sockets with polymeric material and technological exposure, the mold is opened. The ejection plate 9 hits the stop of the injection molding machine (not shown) and moves the plate 7 off. The removal plate 7 pushes semi-matrices 4 and 5. which, due to the interaction of the finger 14 with the groove 15, move to the sides from the product at an angle, freeing the undercut. At the same time, the removal plate 7 at the initial moment pushes the part from the sign 10, which draws a hole and holds the part in the center of the closing of the semi-matrix 4 and 5 and when the semi-matrix 4 is moved to the side of the distributing gate 6 and the separating gate

0, the sharp edge of the groove cuts off the inlet sprue, since the product is held for a while by the sign 10 in the raised position in the center of the closing of the semi-matrix 4 and 5.

Upon further movement of the semi-matrix 4 and 5, the product remains open and hanging

5 at the end of mark 12, which is faced with a plate 7 removal.

Under the action of the semi-matrix 4, the dilution sprue deforms to the center of the form, and an elastic force is formed, which additionally contributes to the exit of the gating system from the grooves of the semi-matrix 4. This allows the use of this form in an automatic mode of operation.

The closure of the mold occurs in the following sequence.

5 After pushing the products and the gating system, the movable part of the form receives a forward movement in the opposite direction. At the junction of the horizontal plane of the fixed plate 1 with semi-matrix 4 and 5, the latter along the inclined grooves 15 sets t

0 in the holder 3 and upset the plate 7 removal, and through the column 8 - the plate 9 of the ejector with the shtsindel, drive them to their original position. The central ejector is first lowered to the initial position by the plate 9 of the ejector and then by the pressure of the molten polymer material. The casting mold is mainly designed for the manufacture of stepped shapes such as screws with a head having a decorative quality surface.

Since in this case it is necessary to start the sprues under the head, it is most expedient to place one decorating part of the product in the fixed plate and the other in the mobile one.

In the proposed mold availability

5, the inlet sprue in a movable semi-matrix, made in the form of a groove with an undercut, located in the plane of the mold mold connector, allows you to cut off the sprue, push it out. At the same time, the quality of the front surface, the screw head, is high. Collision of the product is done by removing the plate. Slice and ejection of the sprue are performed in one movement of semi-matrix, without the use of a separate rolling element.

FIG. g

Fy

Phage. five

Claims (1)

INJECTION FORM FOR PRODUCTION OF PRODUCTS FROM POLYMERIC MATERIALS, comprising a fixed plate with molding inserts, a holder with half-matrixes, a gating system with an inlet gating channel and a distributing gating channel placed in a fixed plate in the mold releasing plane, a pusher mounted on the pusher with the possibility of contacting with the ends of the half-matrix for their disclosure and movement of the first half-matrix in the direction of the distributing gate channel, and the second in the opposite direction and, a sign, an intermediate and base plate, characterized in that, in order to improve the quality of the products and simplify the design of the mold in the manufacture of products such as screws, a groove with a pointed edge under the inlet sprue channel is made on the end surface of the first half-matrix, and the half-matrix is equipped with fingers located in the guide inclined grooves, which are made in the cage. FIG. /