SU1515404A1 - Device for producing diaphragm assembly of electroacoustic transducer - Google Patents

Abstract

This invention relates to electroacoustics. The purpose of the invention is to increase the production capacity of the membrane assembly and increase its quality. The molds 1 and 2, in the flat surfaces of the connector of which the forming annular grooves 5,6 are made, introduced a membrane stretch assembly in the form of an additional annular groove 8 arranged on the flat surface of the lower half-form located around the main groove 6 and installed in There are rings 9, spring-loaded with a calibrated force perpendicular to the plane of the connector of forms 1 and 2, which includes an annular protrusion 12, which is made on the flat surface of the upper half-form and has a wedge-shaped section. 2 Il.

Description

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The invention relates to electro-acoustics and is intended for the manufacture of membrane assemblies of electro-acoustic transducers.

The purpose of the invention is to increase the productivity of the manufacture of the membrane assembly and its quality.

FIG. Figure 1 shows the proposed mold in section by a plane passing through the axis of its symmetry; in fig. 2 - the plane of the connector half-form.

The device contains the upper 1 and lower 2 half-molds, in flat surfaces 3 and 4 of the connector of which the forming annular grooves 5 and 6 are made. The stretching unit of the membrane 7 is made in an additional annular cap 8, located on a flat FiepxnocTi connector 1n { half-form woks of its forming groove, and installed in an additional groove, coli.a 9, spring-loaded using a spring .. 10 with tarirovanny effort to n. 1kk () c: ti connector of the lower half-form. Ko.sh.tso 9 has a groove 1 1 wedge-shaped section, which includes a coaxial and soothed ring protrusion 12 with a wedge-shaped section. This protrusion I binojnieH on the additional ring 13 mounted on the annular slot 14, made in the upper half of the mold 1 concentric with its forming groove. The additional ring 13 is spring-loaded to the upper mold with the help of a spring 15.

The device includes a fixing unit for a part of the membrane edge located on the line of the gating channel, consisting of two grooves 16, each of which is made in accordance with the corresponding half-mold and after folding the half-shapes into one shape, together with the other grooves single channel.

This assembly is made in the form of protrusions 17 and 18 located on the inner walls of the gating channel formed by the addition of grooves 16 and intended to be inserted into the mold of the molding material. After adding the grooves into a single channel or after folding the half-shapes, the protrusions 17 and 18 are in contact with each other, which ensures that the part of the membrane edge, which is located on the line of the sprue channel, is fixed only after the projection 12 of the additional ring 13

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five

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5 0 5

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will enter the groove 11 of the ring 9, which will allow the membrane to stretch before the edge of the membrane located on the line of the gating channel is fixed. This prevents the formation of bumps by the membrane.

Due to the contact of the protrusions 17 and 18, when injection molding material is introduced into the channel formed by the addition of the grooves 16, the flow of the molding material passing through this channel is divided into two parts, which are uniformly distributed on opposite surfaces of the membrane in the form of .

The device, which provides for the manufacture of electroacoustic converter armature, also includes a molding machine with a material cylinder (not shown) j providing the injection molding mixture to the mold under pressure.

Before feeding the casting material into the device, half-molds 1 and 2 are opened along flat surfaces 3 and 4. A membrane 7 is mounted on the opened flat surface of the half-arm 2 and secured. The membrane is pre-stretched 7 by force P, directed radially from its center, the ratio of which to the thickness cG of the membrane is constant, while

Р / сГ К-Е,

where K is a coefficient depending on

thermal shrinkage of the material of the reinforcing rings after its cooling;

E is the modulus of elasticity of the membrane. The membrane is tensioned after the half-molds are closed, while the additional ring 13 is fixed relative to half-mold 2 and half-mold 1. When the membrane is tensioned, the annular protrusion 12 enters the groove 11 of the wedge-shaped section, and the edges of the membrane are in contact , inside the groove 11, made in the ring 9. In this case, the spring 10 is compressed. Since the force of the spring 10 depends on the degree of its deformation, and the latter during the pre-tightening process is unchanged, the force P is also unchanged and is determined by the degree to which the additional coil 13 enters the ring

5I5

groove 8 or the degree of deformation of the spring 10 located in the annular groove 8.

The molding material in the cavity is held under pressure until the molding material has reached a solidification temperature during the cooling process. When the temperature starts to harden start. They intend to further tighten the membrane, immersing the additional ring 13 into the annular gap, which is necessary to compensate for the linear shrinkage of the reinforcing ring formed after cooling the casting mixture. The additional tension force is fixed at the end of the hardening of the reinforcing ring. The cooled ring with a membrane or membrane assembly is removed after the connector of half-molds 1 and 2.

Claims (2)

1. An apparatus for manufacturing a membrane unit of an electroacoustic converter, comprising an upper and a lower device for clamping a membrane and a membrane stretching unit, characterized in that, in order to increase productivity 04 6 fabricating the membrane assembly and improving its quality; the upper and lower devices for clamping the membrane are made in the form of half-molds in contact with flat connector surfaces, each of which has coaxially identical main annular grooves, and the membrane stretching assembly is designed as an additional annular groove in one from the half-form and the annular protrusion of the wedge-shaped section in the other half-form, and the additional annular groove does not intersect the main one and its diameter is larger than the diameter of the main groove, in addition itelnoy ring groove set, spring-loaded toward the parting line, and the ring formed annular groove of the wedge section, which includes a wedge-shaped annular lip section. 2. The device according to claim 1, about tl and the fact that the annular protrusion of the wedge-shaped section is made on an additional ring installed in the annular gap of the corresponding half-shape and spring-loaded from the plane of the connector of this half-shape. /