SU1302153A1 - Method of manufacturing membrane assembly - Google Patents

Abstract

The invention relates to a measurement technique, specifically to pressure sensors. The purpose of the invention is to increase the reliability of the membrane assembly. To do this, after deposition of the metal film - membrane 4 on the end of body 1, the treated surface of the low-melting material 2 and the mating surface of the rod 3 is heated to the melting temperature of the low-melting material. By supplying the maximum permissible pressure to the membrane 4, the melt is pressed into the gating holes in the housing 1. After the assembly is cooled to a normal temperature and the pressure is released, the membrane 4 returns to its original state. 8 il. i (I ooo oh oo oo ig ig. 8

Description

. The invention relates to instrumentation, in particular to the manufacture of membrane assemblies used in pressure sensors.

The aim of the invention is to increase the reliability of the membrane assembly. FIG. 1 to 8 show the steps of making a membrane assembly.

The method is carried out as follows.

The body blank 1 of type 36HTHU material (Fig. 1) is poured with low-melting material 2 — an alloy of tin-bismuth type (FIG. 2), after which the surface of the low-melting material 2 is mechanically processed to obtain the necessary profiles, for example, trapezoidal (FIG. 3). In the central hole of the preform of the housing 1, the rod 3 is fixed (Fig. 4). At the end of the body blank, the treated surface of the low-melting material 2 and the mating surface of the rod 3 is deposited, for example, by electroforming metal film (membrane) 4 (Fig. 5). In the gap between the rod 3 and the central hole of the housing 1 a technological sleeve 5 is installed to prevent it from getting in this hole fusible material 2 when heated (Fig. 6).

The resulting assembly of the membrane assembly is heated to the melting point of the low-melting material, and the maximum allowable pressure P is applied to the membrane 4, which is deflection

The membrane, and the molten alloy, also moving in the direction of pressure, is pressed into the gating holes in housing 1 (Fig. 7). The membrane assembly assembly is then cooled to normal temperature, with the result that the low-melting material 2.0 solidifies, retains an formed profile that corresponds to the profile of a bent metal film membrane 4. After the maximum allowable pressure P is removed from the assembly, membrane 4 returns to the initial state, the process sleeve 5 from the assembly and the excess low-melting material from the sprues of the housing 1 are removed and the finished membrane assembly is obtained (Fig. 8).

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formula of invention

A method of manufacturing a membrane assembly, including pre-fabricating a body preform with an internal cavity, filling the cavity with a low-melting material, mechanically treating the interface surface and spraying the membrane surface as a film, characterized in that the membrane assembly is heated to the melting point of the low-melting material. Tialia, then the maximum permissible pressure is applied to the membrane, the membrane assembly is cooled to normal temperature and the pressure is released.

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Claims (1)

Claim A method of manufacturing a membrane assembly, including prefabricating a body blank with an internal cavity, filling the cavity with fusible material, machining the interface and spraying the membrane in the form of a film, characterized in that, in order to increase reliability, the membrane assembly is heated to the melting temperature of the low-melting mater .al, then the maximum allowable pressure is applied to the membrane, the membrane assembly is cooled to normal temperature and the pressure is relieved (Put. 1 FIG. 2 FIG. 3 FIG. 5 FIG. 6 1392153 FIG. 7