SU816767A1 - Mould for making internally threaded polymeric articles - Google Patents

Description

(54) CASTING FORM FOR THE MANUFACTURE OF POLYMERIC PRODUCTS WITH INTERNAL THREAD

one

This invention relates to the processing of plastics into articles.

A device used in injection molds for the production of polymeric articles with internal thread, containing rotating thread marks of various diameters, is made known with the possibility of relative axial movement 1.

However, the device does not provide for the manufacture of threads in a product with different directions.

The closest in technical essence to the present invention is a casting mold for the manufacture of polymer articles with internal thread, containing movable and stationary half-molds and concentrically arranged threaded signs mounted in the movable half-mold rotatably, the shank of the enclosing sign being in the form of a lead screw interacting with the placed on it is a threaded sleeve 2.

A disadvantage of this device is the impossibility of automatically unscrewing from the product threaded marks having threads with different directions, helix, and also if the smaller diameter thread has a large pin, since the relative movement of the threaded marks during unscrewing is possible only in one direction.

The purpose of the invention is to enable the manufacture of products with threads having different directions.

Claims (2)

This goal is achieved by the fact that in the injection mold for the manufacture of polymeric products with internal threads, containing movable and stationary half-molds and concentrically arranged threaded signs mounted in the movable half-shape rotatably arranged, the shank of the enclosing sign is in the form of a lead screw interacting with the threaded sleeve, the shank of the male threaded mark is made in the form of a lead screw and provided with an additional threaded sleeve, and the threaded sleeve of the outer The connecting sign is mounted with the possibility of axial movement and is rigidly connected with an additional threaded bushing, with the ratio of the splines of the threads of the chassis screws proportional to the ratio of steps of the design of the threads of the characters. The proposed device is shown in the drawing, a section of its part along one of the design sockets. The casting mold contains a fixed half-form 1, a matrix 2, which forms the outer surface of the product, a movable half-form in which threaded marks 3 and 4 are placed, which define the internal surface of the product, interconnected by means of balls 5 and covers 6 installed by means of balls 7 between the sign holder 8 and the plate 9, in which the spring-loaded springs 10 of the pusher 11 are arranged concentrically with the threaded marks; the pins 11 have pins 12, the ends of which enter the radial grooves of the middle part of the threaded mark 4; Leso 13, which interacts with the drive bar 14, and the shanks of the threaded marks 3 and 4 are made in the form of spindle screws 15 and 16, interacting respectively with threaded bushings 17 and 18 interconnected and having studs 19, the ends of which enter the radial grooves of the character holders 8. The direction of the screw lines of the chassis screws 15 and 16 is opposite to the direction of the screw lines of the threaded marks 3 and 4, respectively, and the ratio of the pitch of the threads of the chassis screws is directly proportional to the ratio of the threads of the threaded marks of the threaded marks. The device works as follows. After the plastic has been poured in and the required technological exposure, the casting mold is opened, the sprue guard is torn off, after which the die 2 releases the outer surface of the product 20, the threaded mark 4 and, interacting with the pinion gear 14, begins to rotate, and the threaded sleeves 17 and 18 held against turning with pin 19, they move together downward, driving the threaded sign 3, the direction of rotation of which depends only on the direction of the helix of the lead screw 15. During unscrewing the threaded marks In 3 and 4, the product is constantly pressed against the cylinder II, which is kept from turning with a pin 12 and has grooves on the forming side that protect the product from turning. After the threaded marks have been completely unscrewed, the product is removed from the injection mold connector with compressed air. The mold is then closed, with the pusher 11 and the die 2 being reset. By reversing the pinion gear 14, the threaded bushings 17 and 18 are returned to their original position. Thereafter, the cycle is repeated. The proposed device makes it possible to obtain by molding and pressing a product having concentrically arranged threads with any ratio of leads and directions of the screw lines. Claims of the Injection Molding mold for the manufacture of polymeric articles with internal thread, containing movable and stationary half-molds and concentrically arranged threaded signs mounted in the movable half-shape rotatably, and the shank of the enclosing sign is made in the form of a lead screw interacting with a threaded sleeve disposed on it, characterized by the fact that, in order to enable the manufacture of products with threads having different directions, the shank of the male thread The canal is designed as a lead screw and is provided with an additional threaded bushing, and the threaded bushing of the female mark is axially displaced and rigidly connected to the additional threaded bushing, with the step ratio of the threaded screws being proportional to the ratio of the steps of the character threaded threads. Sources of information taken into account in the examination 1. USSR author's certificate number 400490, cl. In 29 D 1/00, 1971. 2. USSR author's certificate number 283550, cl. In 29 C 5/00, 1965 (prototype). P IS