SU1417214A1 - Arrangement for manufacturing diaphragms of moving coil loudspeakers from thermoplastic film - Google Patents

Abstract

The invention relates to the field of radio engineering and can be used to create sound reproducing apparatus. The aim of the invention is to improve the quality of the membranes and improve the performance of the device. Based on 1, a thin-walled matrix 2 is fixed, filled with heat insulator 5 and enveloped outside by heat insulating sleeve 6. Matrix 2 is equipped with through channels 7 that lead to the forming and lateral surfaces. A polymeric thermoplastic film 19 is clamped to the surface of the matrix, which is clamped by a retainer 10 when the plate 9 is lowered. Hot air is fed through the through channels 7 of the matrix and the channels 17 of the punch, heating the film 19 simultaneously with the matrix 2 and the punch 15. and is covered by a heat insulating sleeve 11. After the strip 19 is softened, the nlita 13 is lowered and the punch 15 forms a membrane. Then, channels 7 and 17 are supplied with cold air, cooling the membrane simultaneously with matrix 2 and punch 15. Plate 9 and bushings 6 and 11 are equipped with through channels 12 d, 1 I of exhaust air discharge 1 sludge. F cl

Description

ND

The invention relates to radio engineering and can be used to create sound reproducing equipment, as well as in other areas of national economy in the manufacture of complex configuration products from thin polymer thermoplastic films.

 The aim of the invention is to improve the quality of the membranes by ensuring uniform heating and cooling of the film simultaneously with the matrix and the punch and increasing the productivity of the device by shortening the heating and cooling times.

The drawing shows the proposed device.

The proposed device comprises a base 1 on which a fixed thin-walled matrix 2 and two pairs of columns 3 and 4 are rigidly fixed. The matrix 2 is filled inside with heat insulator 5 and enveloped outside with heat insulating sleeve 6. Matrix 2 is equipped with through channels 7 that go to forming and lateral surfaces. Through the tube 8 in the heat insulator 5, hot and cold air is supplied to the matrix.

Columns 3 are fixed with the possibility of reciprocating movement of the plate 9 with the latch 10 and the heat insulating sleeve 11. Nlita 9 and the latch 10 are provided with through channels 12 for exhausting the exhaust air.

The columns 4 are mounted with the possibility of reciprocating movement of the plate 13 with the holder 14 and the punch 15 connected to the bottom filled with the thermal insulator 16. Nuanson 15 is provided with through channels 17 extending to its side surface. Through the tube 18 in the heat insulator 16, hot and cold air is supplied to the punch 15.

The membrane is made of a dynamic loudspeaker head in the following way.

A polymer thermoplastic film 19 is applied onto the surface of the matrix 2. A plate 9 is lowered through columns 3, and a clamp 10 clamps a film 19. Thus, just before the formation of the membrane, a closed chamber is created consisting of a matrix 2, sleeve 6, clamp 10, sleeve 1 and punch 15. Through pipes 8 and 18, air passes through through channels 7 and 17, heating film 19 at the same time as matrix 2 and punch 15. When the temperature of softening film 19, which is controlled by thermocouple 20, is reached, the plates are lowered 13 and the punch 15 forms the membrane. Then through the tubes 8 and 18 cold air is supplied, which through the same channels 7 and 17 flows to the formed membrane, and cools it simultaneously with the matrix 2.

and punch 15 to a temperature at which the relaxation phenomena in the material of the film 19 practically cease.

Due to the fact that the matrix 2 is provided with through channels 7 extending to the forming and side surfaces, and the punch 15 is equipped with through channels 17 facing the side surface, and after the formation of a closed chamber, hot air flows through these through channels on both sides simultaneously with the matrix 2 and the punch 15. It is very important to provide the necessary temperature along the edge of the moldable membrane, since in this place the heat from the body of the matrix 2 and the punch 15 to the environment is especially large. Since the matrix 2 and the punch 15 are filled inside with heat insulator 5 and 16 and are equipped with heat insulating sleeves 6 and 11, heat removal from them is minimal and the temperature of the matrix 2, the punch 15 and the membrane 19 clamped in the chamber when molding the membrane is the same. Therefore, at the moment of contact of the film 19 with the die 2 and the punch 15, no shrinkage occurs and the softened film 19 fits the smooth (without holes) shaping surface of the punch 15. The configuration of the molded membrane accurately duplicates the configuration of the punch 15, and the thickness of the membrane over the entire section the same. Cooling of the formed membrane occurs simultaneously with cooling of M. matrix 2 and punch 15, therefore, when they are closed, the membrane does not warp.

In the fixed matrix 2, the through channels 7 are made to exit to the forming surface, which does not affect the quality of the formed membranes, but promotes maximum utilization of the incoming compressed air from heating and cooling, therefore, leads to a decrease in the time of forming the membranes. With the same purpose, the die 2 and the die 15 are thin-walled (0.3-0.5 mm), they are heated and cooled rapidly, which also shortens the membrane molding time and improves the productivity of the device.

Claims (1)

Invention Formula A device for making membrane heads of loudspeakers from a thermoplastic film, comprising a base with a fixed matrix fixed on it and two pairs of columns on which a retainer with through channels and a punch are mounted for reciprocating movement, characterized in that quality membrane by providing uniform 3114172144 heating and cooling of the film is simultaneously provided with through channels alternately with the die and punch and rising to the side surface, with the die labor productivity, the supply-and-die matrix is made of thin-walled ones, filled with through channels, the output of which is insulated by external insulators and covered outside shaping surface, and punch insulating bushes.