SU444678A1 - Casting form - Google Patents

Description

one

The invention relates to molds for making articles with undercuts.

Injection molds are known for manufacturing articles from polymeric materials that have undercuts on the inside, containing movable and fixed plates with a punch, a matrix and forming undercuts of movable inserts hinged to the movable plate by means of hairpins and earrings, and a plunger.

However, when fabricating products such as a rectangular corner with inwardly protruding undercuts, the movable inserts forming the undercuts are located at angles 45 to the line of the form connector, which leads to jamming and its damage,

The purpose of the invention is to ensure reliable operation of the form at the position of the moving inserts at an angle of 1 from d; 5 to 45 to the plane of the connector,

In this form of interaction with a stud, the opening of the earring has the shape of a slit, the length of which is greater than the diameter of the stud.

Fig, 1 shows a fragment of the described form, section; FIG. 2 is a section along A-A in FIG. -one; Fig. 3 shows the form, the moment it is opened; in fig. 4 is the same as the moment of moving the inserts from the product.

The blade contains the fixed plate I with the matrix 2 and the gating sleeve 3, the movable plates 4 and 5 with the liner 6 placed in them. In the liner 6 there are grooves for the design of the undercuts of the sliding inserts 7 pivotally connected by means of pins 8 and 9 and earrings 10 with legs -11 of the movable plate 12. The screw -13 passing through the plztu 4 is limited. The repellent pru "INN 15 is placed on the screws 13 and rests on the rod 16. In the latter, a punch 17 is pressed in, through which the pusher 18 passes. Inserts 7 have bevels in which they are clamped between the struts -11 and the one of the 5. The Kaad earring 0 has slit a, the length of which is greater than the diameter of the studs 8. The form works as follows. The polymer melt through the lining bushing 3 and the injection channels enters the etching cavity formed by the matrix 2, the decoration inserts 7 and the punch 17. The design of the insert 7 is clamped between the pillars II and the plate 5, the repulsive springs 15 are compressed condition. After an appropriate exposure, the shape is opened, while the repulsive springs press plate 5 together with the smashing undercuts inserts from bars 16 and 12. The earrings 10 do not interfere with the movement of the decoration inserts, since their studs 8 freely float in the slots a. A free cavity B is formed between the punch 17 and the surface of the molded product 19. The repulsive springs 15 continue to press the plates 5 and 4 together with the molded product, and the studs 8 abut against the edge of the slot and the drawing of the undercut of the product 7 which springs t into the free cavity B. Then the VINTB 13 is bumped into heads and stopped by states 4 and 5. Upon further joint movement of plates 4, 5, 16 and / 12, a connector b is formed between the plates I and 4. At this, the pusher 18 resets the product with insert 6. Next, the cycle repeats. PROVIDES INVENTIONS A casting mold for the manufacture of polymeric materials of products having undercuts on the inside, containing movable and fixed plates with a punch, a matrix and a design of the undercuts placed in them, movable inserts hinged to the movable plate by means of studs and earrings, and a plunger, characterized in that, in order to ensure reliable operation of the mold when the movable inserts are located at an angle from 15 to 45 to the plane of the connector, the opening of the shackle interacting with the pin has slit which is longer than the diameter of the stud.

FIG. 2

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