SU1204390A1 - Casting mould for manufacturing spectacles rims - Google Patents

Description

The invention relates to equipment for the production of plastic products and can be used for the manufacture of products with internal undercuts closed (and not closed) along a contour such as eyeglass frames, as well as in the chemical and light industries.

The purpose of the invention is to improve the quality of products by eliminating traces of pushers on them.

FIG. 1 shows the casting mold in the closed (initial) position, section; Fig. 2 shows the same, to the head; the moment of ejection; fig. 3 - the same at the final moment of ejection.

The casting form contains a fixed part — plate 1, the movable part — plate 2, rigidly connected to the base plate 3, on which the matrix 4 is placed. In the plates 5 of the Bogkalivateli, the pushers 6 are mounted. Each pusher 6 is hingedly connected with the sign 7, decorated with undercut by the locking 1; contoured contour. The sign 7 on the side of the matrix 4 has a conical protrusion “a” for entering the slot “b” in the matrix 4. On the protrusion “a, a slot is made for the ends of the inclined columns 8 and 9 and the pusher 6 pivotally connected with the sign 7 and the pusher 6 hinges. The holes and the axis 10 are parallel to each other and the distances between them are equal (see FIG. 3). The axis on which the holes are located is at an angle to the axis of the mold a of 90 °. At an angle, as shown in Fig. 1, the oblique guide column 9 overtakes the oblique column 8; if the angle, the oblique column 9, on the contrary, lags behind the oblique column 8 and when pushing out, the sign 7 will be from the inside, not from the outside of the product.

The inclined guide columns 8 and 9 and the pusher 6 at the ends are connected with the sign 7, have flats in the size of the groove, which provides mobility in the groove around the axes, which provide hinge joints.

In the matrix 4 of the movable part there are made converging guide holes for the guiding inclined columns 8 and 9 at an angle p to the axis of the pusher 6. The ejector plates 5 are equipped with springs 11 for returning the plates 5 and signs 7 to their original position.

Casting form works as follows.

After injection of the melt into the cavity of the matrix 4 and cooling of the product, the mold is disconnected. The movable part of the form departs from the fixed and the product remains

in the movable matrix 4 on the signs 7. Before the start of the ejection, no changes occur in the interaction of the shape parts.

With the start of the pushing out (see Fig. 2), the entire pushing system moves forward and at this time the push rod b, abutting on the sign 7, moves it from its place. The sign 7 moves the directional inclined columns 8 and 9, which cannot leave the converging guide holes, and since the distance between the holes under the axis 10 on the sign 7 remains constant all the time, the sign 7 begins to turn around the axis of the pusher 6. When two signs 7 are rotated in opposite directions, they pull the rim of the outer edges, bending it. The inner ends of the signs 7 come out of the socket “b, and upon further pushing, the middle part of the product also comes out of the socket.

0 The bending of the rim occurs as long as the outer ends of the signs 7 are engaged with the product. As soon as the guiding inclined columns 8 and 9 rotate the sign 7 by a sufficient amount, the frame product comes off the sign 7 and remains hanging

5 on inclined guide columns 8 and 9 (see FIG. 3). The magnitude of the bend of the product depends on the depth and shape of the facet groove of the product - right. With a depth of up to 0.7 mm, residual deformations are absent, the larger the angle of the facet groove, the easier it is to remove the sign 7 from the product.

During the ejection process, the spring 11 is compressed and the gate is ejected from the mold. After stopping the mold and removing the product, the mold closes. The springs 11 discard the ejector system to the initial position, the pusher 6 moves the sign 7 behind it, and the inclined columns 8 and 9 rotate it to the initial position. The conical protrusion "and the sign 7 goes into the conical socket" b of the matrix 4

0 and the form closes. The conical protrusion “a” prevents the displacement of the sign 7 in the mold under the pressure of the molten material.

0

After the mold is closed, it is ready for subsequent injection of the molten material.

The proposed mold design ensures the manufacture of products with a facet groove along the entire contour with a one-piece sign on an injection molding machine in a semi-automatic mode while improving the presentation due to the absence of traces from ejectors and simplification of the mold design.

1

Faq 3

Claims (1)

INJECTING FORM FOR PRODUCTION OF TYPE OF GLASSES, WITH MOBILE AND MOVABLE PARTS, signs for forming closed undercuts and pushers, characterized in that, in order to improve the quality of products by eliminating traces of pushers on them, each sign is pivotally connected and equipped the inclined columns pivotally connected to the sign, located in the guide holes converging to the axis of the pusher, which are made in the movable part, the axis of the pusher hinges and the inclined columns of each sign parallel and the hinge axis of the inclined columns are placed at the same distance from the axis of the pusher.