SU750577A1 - Method of manufacturing bimetallic wire - Google Patents

Description

(54) METHOD OF MANUFACTURING BIMETALLIC

WIRES

one

The invention relates to electrical engineering, mainly to the technology of bimetallic wire.

A known method of making wire from a pipe filled with powdered material 1. A seamless or welded pipe is wound onto a mandrel before it is filled with a powdered material. Then, the filled tube, with shaking, fills through the open end with a predetermined amount of powdered material.

The disadvantages of this method are low density of filling the pipe with powder, since it is possible that there are air cavities between the pipe and the powder, which reduces the electrical conductivity of the wire; in view of the fact that the powder grains have a different shape and dispersion when the tube is filled, air microcavities are formed between them, which reduces the electrical conductivity of the wire; Repeated drawing is used to ensure reliable contact of the powder with the pipe, which reduces the productivity of the process.

The closest in technical sushi ness to the invention is a method for producing multi-layered wire, according to which a copper bar is loaded into a pipe made of pure iron and then into a pipe made of a heat-resistant alloy 2. The workpiece thus assembled is further subjected to compression and single or multiple drawing to the required diameter.

However, when filling a bar into a long pipe, its diameter is much smaller than the internal diameter of the pipe. Therefore, multiple drawing is used to contact the pipe with a bar (compression), which does not provide a high process efficiency; the final length of the product is limited by the length of the original bar, which can

 fill the tube; when refilling a long pipe with a bar of plastic materials (for example, copper, aluminum, silver), difficulties arise as a result of high friction forces between the seasoned rod and the pipe, and as a result - the break of the filled material ..

Claims (2)

The purpose of the invention is to expand the functionality of the obtained wire by increasing its length. The goal is achieved by filling a tube of one metal with cylindrical pieces of another metal, sealing them with compression from the ends of the tube and welding, for example, by passing an electric current, after which they draw to the required diameter. In this case, the pipe is filled with pieces of metal, the length of which is in the range from the size of the internal diameter of the pipe to half its length. The method is carried out as follows. Ferritic and austenitic stainless steel pipes, nickel, chromium and other metals are used as pipes. Cylindrical segments cut from a rod of conductive material, such as copper, are used as the core. The ratio of the components of a bimetallic wire is usually SO – SO / o for copper and is determined by the required strength and electrical conductivity of the wire at high temperatures. At the ends of the outer sheath (pipe), external threads are cut, which are necessary for compressing the filler before welding. A long pipe is wound in a spiral on the drum so that the coils do not touch each other. This condition is necessary, because otherwise the passing of the electric current will result in a short-circuit BITKOV. The pipe is filled with pieces of conductive material and vibrations are simultaneously reported to the pipe wound on the drum. For example, an ultrasonic source is attached to the pipe. Since the tube has the shape of a spiral, three types of ultrasonic vibrations arise in it: longitudinal, torsional, bending. As a result, all points of the pipe experience oscillations, which reduces the frictional forces during filling of the pipe with segments. The optimal length of the cylindrical segments depends on the diameter of the drum and the curvature of the pipe. The ultrasonic source is disconnected, screwed onto the ends of the nozzle pipe into which the rods are screwed. The sections are squeezed with rods in the pipe. An electric current is applied to the rods and the segments are welded. After welding, remove the shtutsera. The workpiece is crimped by dragging. The resulting billet is drawn to the required size. The invention is illustrated by the following examples. Example 1. At the ends of the pipe from steel 12x18H10T with a diameter of 12 mm with a wall thickness of 1 mm and a length of 36 m, external threads Ml2x1 are cut. The pipe is wound in a spiral on the drum so that the coils do not touch each other. A PMS15-18A magnetostriction transducer with a frequency of 18.2 kHz and an amplitude of 26 µm is attached to the tube and ultrasonic vibrations are communicated to it. The pipe is filled with cylindrical pieces of copper rod with a diameter of 9.5 mm and a length of 20 mm. After filling the pipe, the magnetostrictive transducer is disconnected, and the fittings are screwed onto its ends. The threaded rods are screwed into the nipples and clamped in the pipe with a force of 100 kg. Then a pulsed electric current of 3000 A is applied to the rods, which ensures the welding of filler pieces. After welding, the fittings are removed from the pipe and crimped by dragging in one pass. A predetermined final diameter of 0.4 mm is provided for subsequent hairline in 20 passes. Example 2. A copper bar with a diameter of 8 mm is filled into a pipe made of material lOxlSHlOT with a diameter of 12 mm with a wall thickness of 1 mm and a length of 12 m. It is impossible to fill a pipe with a longer bar length, since great friction forces arise between the pipe and bar surfaces, which causes the copper bar to break. Tight contact of the tube with the copper bar is ensured by compression by dragging in two passes. A predetermined final diameter of 0.4 mm is provided by subsequent dragging, also in 20 passes. Example 3. In a pipe with the parameters as in example 2, two copper rods with a diameter of 9 mm are filled from both sides. The ends are pressed against each other and a pulse current of 2000 D is passed. After welding, the compression is carried out by drawing in one pass. A predetermined final diameter of 0.4 mm is provided by drawing in 20 passes. The final length of the finished product (wire with a diameter of 0.4 mm) in this case is obtained by 30% longer, because it is possible to load the bar into the pipe 1 mm larger in diameter. Thus, this method allows to obtain a two-layer wire 3-6 times more. Claim 1. Method for making bimetallic wire, including filling a pipe from one metal with another metal and drawing a filled tubular billet, characterized in that, in order to expand the functional capabilities of the wire by increasing its length, they are compressed by compression from the ends of the pipe and are welded, for example, by passing S6 no electrical current, followed by OSU-Sources of information, There are drawing. taken into account in the examination 2. The method according to claim 1, characterized in that the pipe is filled with pieces of me-1. Patent of Germany No. 1602260, cl. 7 37/04, talla whose length is within 1970. on the size of the internal diameter of the pipe2. US Patent No. 3282660, cl. 29-193 up to half of its length. (prototype). 750577