CS241237B1 - A method of producing oriented plastic-decorated bijouterie moldings from metal strips - Google Patents

Abstract

The method of producing oriented plastically decorated imitation jewellery mouldings from metal strips can be used in the Jablonec jewellery industry. Its essence lies in the fact that the metal strip is pushed between two rollers with shaped active surfaces pressed together, between which plastic moulding decorations are formed on the strip. Oriented plastically decorated mouldings are then cut out from the strip in a tool with a straight guide of the parts with active surfaces.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing oriented plastically decorated jewelry moldings from metal strips.

[0004] The oriented plastic-decorated jewelery moldings have so far preferably been produced in molding tools with a linear guidance of the active surface parts. The metal strip is gradually pressed, in individual strokes of the tool, in a series of oriented plastic decorations of moldings. In order to achieve the final shape of the embellishment, several successive pressing tools with a linear guidance of the active surface parts are often used. From the strips on which a series of oriented plastic moldings are formed, the oriented molded plastic moldings are cut out in the last pressing tool with a rectilinear guiding of the parts with active surfaces.

Said method of producing oriented plastically decorated costume jewelery moldings is disadvantageous in particular because it requires efficient press machines with costly maintenance, which allow to achieve high impact pressures. Feeding of the strips into the pressing tools with straight guidance of the parts with the working surfaces cannot always be mechanized and manual insertion of the strips into the pressing tools is one of the work with a high risk of serious work injuries.

The drawbacks of the presently used method of producing oriented plastically decorated moldings are eliminated by the method according to the invention, which consists in that the strip is pushed between two rotating rollers with shaped working surfaces on the periphery between which oriented plastics are formed on the strip. molded moldings are then cut out of the strip in a press tool with a straight guide of the parts with active surfaces.

Prior to cutting the extrusions from the strip, the oriented extrusions of the extrusions can be shaped in one or more crimping tools with a straightforward guiding of the parts with the active surfaces.

The process for producing oriented plastically decorated moldings according to the invention does not require high-performance maintenance presses, largely eliminates manual work with a high risk of severe work-related injuries and significantly increases labor productivity.

The method of making oriented plastically decorated jewelry moldings according to the invention can be used, for example, for molding a daisy flower.

A 17 mm wide brass strip 0.7 mm thick, rolled into rolls, is used to produce daisy flowers. The beginning of the tape from the roll clamped freely rotatably in front of the roll stand rolls is inserted between two roll stand rolls pressed together. The cylinders have a diameter of 68 mm and the shaped working surfaces are on their periphery. As the tape passes between the rolls, plastic daisies are formed in a row in a row. The strip passing through the rolls of the rolling mill rolls into a roll. In a tool with a rectilinear guiding of the active surface parts, clamped, for example, in an eccentric press, daisies flower moldings are then cut from the unwound tape.

Before cutting the daisies flowers, the daisies' plastic flowers can be creeped on the tape, by means of a so-called deep press, in a tool with straight lines of parts with active surfaces.

Claims (2)

Subject Method for producing oriented plastically decorated metal jewelery blanks, characterized in that the strip is pushed between two rotating rollers with shaped working surfaces on the periphery between which the oriented plastic decorations of the blanks are formed on the strip, whereupon the strip is formed in a press tool with a linear guide BACKGROUND OF THE ACTIVE SURFACES. Cut out oriented plastic moldings. 2. A method according to claim 1, characterized in that, prior to cutting the moldings from the tape, the oriented plastic embellishments of the moldings are formed in one or more molding tools with a rectilinear guiding of the surfaces with active surfaces.