SU1199646A1 - Casting mould for manufacturing undercut polymeric articles - Google Patents

Abstract

CASTING FORM FOR THE MANUFACTURE OF POLYMERIC PRODUCTS WITH UNDERSTRUCTIONS, containing a movable plate, a stationary plate and a holder connected to it, in a directional direction inclined to the longitudinal axis of the form, which are fitted with wedge elements forming one of the components of the sliding matrix, another part of which is the bottom element rigidly fixed on the fixed plate and the means of movement of the wedge elements, characterized in that, in order to expand the technological capabilities of the injection mold by providing forming items of complex configuration without increasing its overall dimensions; the bottom element is placed in the zone of the internal non-working cavity of another part, which is formed by wedge elements, the bottom element and wedge elements are mounted with the possibility of contact and relative movement along guides that are made on the inner surface of the wedge elements and on the outer surface of the bottom element at an angle equal to the angle of inclination of the guides in the holder, and the means for moving the wedge elements made in the form of a spring-loaded pusher mounted in a fixed plate. SO; about O5 4 a

Description

The invention relates to the processing of plastics, in particular to injection molds for the manufacture of thermoplastic products with undercuts, as well as having on the sides and (or) one of the two end surfaces of the protrusions, depressions, holes, other relief images, and can be used, for example , for the manufacture of diffusers of fir-tree electrogirdle in light industry.

The purpose of the invention is to expand the technological capabilities of the injection mold by ensuring the molding of articles of complex configuration without increasing its overall dimensions.

FIG. 1 shows the casting form in a closed position (multi-seater version), a longitudinal section; in fig. 2 - a fragment of the working part of the form in the open position, a longitudinal section.

The casting mold for the manufacture of polymer articles with undercuts contains a movable plate 1, a casting fixed plate 2 and a case 3 connected to it with guides a inclined to the longitudinal axis of the form, in which a set of wedge elements 4 are placed, for example, four, forming side surface of the sliding matrix. In the zone of the internal non-working cavity of this part of the matrix, the bottom element 5 of the other part of the matrix is placed coaxially with it, forming the bottom surface of the products and rigidly connected to the fixed gating plate 2. Both parts of the matrix: the wedge elements 4 and the bottom element 5 are mounted with the possibility of contact and relative movement along the guides b and e, which are made along the inner surface of the wedge elements 4 and along the outer surface of the bottom element 5 at an angle equal to the angle of inclination of the guides a in the sleeve 3.

The number of guides in on the outer side surface of the bottom element 5 corresponds to the number of wedge elements 4. In order to create a movement force on the side surface of the bottom elements 5 in the fixed plate 2, a displacement means is mounted in the form of a set of springs 6 forming a spring-loaded plunger with the sleeve 7.

The stationary plate 2 through the sleeves 8 is fixedly connected with an intermediate plate 9, in which holes 10 are made to accommodate the relative to the wedge bottom element 5 (face of matrix sign) the sleeves 7. The listed elements and kinematic connections form a fixed part of the injection mold.

The movable part of the form includes movable plate 1, ring 11, plate 12,

a plate 13 with signs 14 rigidly attached thereto, which serve to design the inner contour of the product, and a plate 15 for removing finished products.

Columns 16 and sleeves 17 are designed to guide the moving part relative to the fixed part. The ejector system is designed as a shank 18, plates 19 and 20, and pushers 21 and 22.

Casting form works as follows.

After injection into the forming cavity formed on one side by wedge elements 4, bottom element 5 and marks 14 on the other hand, through the gating system located in the gating plate 2 of thermoplastic and necessary holding, the movable part of the mold is under the action of a press force (not shown) moves away from its fixed part along guide columns 16 and bushings 17. At the same time, wedge elements 4 placed in slots of casing 3 along its conical surfaces and guides into bottom element 5 (end marks of the die) are mixed in axes m (by an amount S, FIG. 2) and radially from the center directions. As a result, the molded relief of the product is released from contact with the inner surface of the wedge elements 4 of the matrix. This offset is provided by the force of the springs 6 compressing through the sleeves 7.

After the stationary part of the mold is detached, the product castings on the stationary marks 14, together with the sprue, are moved to the left until the shank 18 touches the stationary support of the injection press. The subsequent movement provides automatic removal of the finished parts with the removal plate 15, which stops further movement as a result of the stop of the shank 18, the plates 19 and 20 and the pushers 21 and 22.

When both parts of the form are closed, the movable part of it provides movement of the split wedge elements 4 in axial and radial directions to the initial position, overcoming the resistance of the compression springs 6.

Then the cycle repeats.

The proposed mold design is distinguished by improved functional and technological capabilities, which manifests itself in an increase in the active area of the mold without an increase in its overall dimensions, which allows the manufacture of complex products to use simultaneously more than two wedge elements of the matrix without changing the overall dimensions of the mold by using two conical guiding surfaces of the working elements (holders 3 and bottom element 5) as inclined guides for sliding along them wedges elements 4. In the present form of the simultaneous interaction of the inclined surfaces spaced frustoconical provides synchronous and coaxial opening parts of the matrix, which eliminates

the possibility of sticking the finished product in the matrix.

Moreover, in the proposed design scheme an annular tubular pusher is used, which creates equal forces throughout the entire area of action, which contributes to the simultaneous disclosure of parts of the matrix.

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Claims (1)

INJECTION FORM FOR MANUFACTURING POLYMER PRODUCTS WITH UNDERWEAR, containing a movable plate, a fixed plate and a holder connected to it, wedge elements are installed in the guides inclined to the longitudinal axis of the form, which form one of the components of the sliding matrix, the other part of which is made in the form of a bottom element, rigidly fixed on a fixed plate, and a means of moving wedge elements, characterized in that, in order to expand the technological capabilities of the injection mold by providing a mold products of complex configuration without increasing its overall dimensions, the bottom element is placed in the zone of the internal inoperative cavity of the other part, which is formed by wedge elements, and the bottom element and wedge elements are mounted with the possibility of contacting and relative movement along the guides that are made on the inner surface of the wedge elements and along the outer surface of the bottom element at an angle equal to the angle of inclination of the guides in the holder, and the means <g for moving the wedge elements is made in in the form of a spring-loaded pusher mounted in a fixed plate. ~ C © c © © 5 ©>