SU128274A1 - Method of making welded membrane and bellows aneroids - Google Patents

Description

Methods for the manufacture of aneroid electro-welded across the board with welding of reinforcement to the membrane are known.

According to the invention, a welded aneroid box is made with an opening for evacuating its internal cavity, which is sealed after the air is pumped out using a vibrating electrode under vacuum.

The use of this method allows to extend the temperature range of the use of aneroids.

FIG. 1 shows an aneroid box welded around the board by the contact roller electric welding with welding of the fastener - the reinforcement to its central part; in fig. 2 - box made using argon arc welding; in fig. Figures 3 and 4 show, on an enlarged scale, parts of the reinforcement with a hole (diameter 0.3 mm) intended for evacuating the internal cavity of the membrane aneroid box.

The cylindrical protrusion (diameter 1.5 X 0.7 mm), if necessary, may be located below the plane of the end of the part, but so that it is ensured that it is touched by the electrode during welding. The dimensions of the protrusion to be brewed are made oddak in all cases, so that the modes of welding are also the same.

Melting the protrusion at the end of the reinforcement and welding the 0.3 mm diameter holes are made using a vibrating carbon electrode. For this, the prepared aneroid boxes together with the welding head are placed under a glass cap, from the inner cavity of which the air is pumped out with a vacuum pump to a predetermined degree of vacuum. Vacuum control is performed using a vacuum gauge.

The carbon electrode, vibriro, closes the part with a frequency of about 16-20 Hz, as a result of which the arc discharge is almost as long as # 128274

flows continuously. The heat released during arc discharge splits the end of the electrode and melts the edges of the part's protrusion. A hole 0.3 mm in diameter connecting the internal cavity of the membrane box with the external medium is closed by the melt, which tends to become drop-shaped due to the action of the surface tension of the liquid metal.

The melting zone is small and does not affect the elastic properties of the membrane box. After removing the vacuum and the hood, the aneroid box is ready for use.

The described method makes it possible to manufacture membrane bellows and other evacuated cylinders from any metals and alloys that can be melted in vacuum, as well as gas-filled aneroids, for which, after vacuuming (before welding the hole in the fastener), the hood cavity is filled with gas or liquid vapor.

Subject invention

A method of manufacturing welded membrane and bellows aneroids, characterized in that, in order to increase the temperature range of aneroid use, the aneroid box is provided with an opening for evacuating its internal cavity, which is brewed after the air is evacuated using a vibrating electrode under vacuum.