SU41343A1 - Device for strengthening in the mold molds for gramophone records - Google Patents

Description

FIG. Figure 1 illustrates the current method of attaching dies to molds for the production of gramophone records. The matrix 7 is attracted to the mold 5 by a ring 3. The number 2 denotes a high pressure zone from which excess mass flows out through the slit 6.

To firmly press the ring to the matrix, it is necessary to produce them precisely, which is very difficult to do in the conditions of our factories gramophone records. Thus, at the point of contact between the ring 3 and the die 7, a seam is obtained, which creates great difficulties for production. The mass, being under hydraulic pressure of about 200 atm., Flows into the marked uiBbi and through them, under the matrix, of the limb, a thin ring protrusion. The finished plate is extremely difficult to remove, since for this it needs to be torn off from the mass flowing under the ring, which causes a great loss in press performance, frequent replacement of expensive rings and discs reject.

The proposed method of moving fasteners from high pressure zone 2 to zone 7 eliminates the above disadvantages. The mass, moving in zone 2 of high pressure, will not meet on its way any seams in which it could

penetrate and pass channel 6 and meet the fastening seams only outside the high pressure zone, where the mass is only waste.

Due to this design of fastening, expensive rings can be replaced by stamped and only polished segments, and any thickness of the gramophone record is achieved.

FIG. 2 shows a top view and in FIG. 3-section of the new die attachment tool.

Along the surface of the molds 5, on which the dies are applied, the annular protrusions 8 are machined. attract the molds 5 with screws 4 and press the die to the mold 5. 2-mass fl plates located in the high-pressure zone, 6-slot to exit the excess mass and 7-place for excess (waste) mass

The subject matter of the invention.

A device for strengthening in the mold the matrices for gramophone records using plates fastened to the half of the mold for clamping the edges of the matrix,

characterized in that the halves of the press, the molds and the matrix are provided at the outer edge with an annular protrusion 5, outside of which the clamping plates 3 are located.