RU1808434C - Method for production of coated steel wire - Google Patents

Abstract

Usage: production of steel wire with a thick coating of softer metal, for example, aluminum or copper. SUMMARY OF THE INVENTION: they clean the contact surfaces of the shell and the core, form a shell around the core by extruding the core of the metal of the shell from a profile with a width equal to the width of the bimetallic billet and a height not less than 2, 3 times the thickness of the shell in the bimetallic billet, while the extrusion process at a ratio of the yield strengths of the core metal and the sheath of not less than 20. Then, the resulting workpiece is drawn. 1 tablet, 4 ill.

Description

ate with

The invention relates to the processing of metals by pressure, in particular to the manufacture of steel wire mainly with a thick coating of softer metal.

The aim of the invention is to improve the mechanical properties of the wire and increase the yield.

The goal is achieved in that in a method for manufacturing coated steel wire, mainly with a thicker coating of softer metal, including cleaning the contact surfaces of the sheath and core, forming a sheath around the core, followed by welding the sheath edges and drawing the obtained bimetallic billet, form a sheath around the core by extruding the metal core on the rolls from a profile with a width equal to the width of the bimetallic billet and a height not less than

2.3 times the thickness of the shell in the bimetallic billet, while the extrusion process is carried out at a ratio of the yield strengths of the core metal OTc and the shell of at least 20.

When forming the tape-shell from the profile, the height of which is not less than 2 times the required thickness of the tape in the bimetallic billet, the shell metal is extruded with compression of more than 50%. This ensures that the shell metal glides over the core surface under conditions of plastic deformation at high specific pressure.

Extrusion of the metal of the shell of serOTs

with a relationship

From

20 let 00

about

00

TO

W Ј b

Small-sized tube-forming equipment is used. On the other hand, this ratio is ensured by heating most metals

(copper, aluminum) which are used for the sheath of industrial grade bimetal wire. Compared to core steel, shell metals have a large coefficient of thermal expansion. Therefore, when forming a shell of a soft metal and heating it, contact pressure is achieved, which, in combination with the specific pressure of deformation of the shell metal, provides welding of the shell and core metals. The resulting bimetallic wire has good mechanical properties.

The implementation of the method is shown schematically in FIG. 1-4. A round steel core 1 and a profile made of metal shell 2, centered by roll calibers 3 and 4, respectively, are fixed in the initial position. The cross-sectional area of profile 2 is equal to the required sheath area of the bimetallic billet. The radii of the calibers of the rolls 3 and 4 are equal to the radii of the core and the sheath of the wire, respectively. In FIG. 2, the steel core 1 by the roll 3 deforms the profile of the shell metal until the gauge of the roll 4 is filled. Fig. 3 fixes the moment of completion of the process of extruding the shell metal from the profile into the tape. In FIG. Figure 4 shows the final step of forming a bimetallic billet shell in rolls 5 and b. Since when the metal of the shell is extruded, the layers of its outer surface slide along the caliber of the roll and are braked by it in comparison with the movement of the metal of the inner surface, a funnel is formed in the shell of the workpiece at the junction of the ends, which ensures high-quality welding of the longitudinal seam of the shell during welding by wire from the metal of the shell.

Example 1. A rectangular copper profile with a width of 9.2 mm and a height of H 5.1 mm and a steel core with a diameter of d 5.0 mm after preliminary cleaning with metal brushes from unwinding devices were sent to the bimetallic billet manufacturing line. Before feeding the rolls, the copper profile was heated to 850 M in a protective gas medium ПСО-09, providing oto 1 kgf / mm2. The cold core fed to the crate has an otc of 60 kgf / mm. Working radius of the upper roll centering core, composition 0

5

0

5

0

5

0

5

0

l l 2.5 mm. The creek of the lower roll is made with a working radius of 4.6 mm with a caliber width of 9.2 mm. In the first stand, the core was pressed to a depth of 1 mm. In the second stand, the rolls of which had a similar calibration, the shell metal was extruded by the core to obtain a shell tape with a thickness of t 2.1 mm. The formation of the shell of the bimetallic billet was completed in the third stand, the rolls of which form a symmetrical round caliber with a radius of 4.6 mm PSO-09 shielding gas was supplied to the working zones of all stands. Behind the third stand of the edge of the copper tape - the shell was welded in a nitrogen medium using a filler wire MRZTTS050 1-0.1-0.1-0.1. The resulting preform with a diameter of D 9.2 mm was annealed in a bell furnace at a heating temperature of 600 ° C and a holding time of 4 hours in a protective gas medium ПСО-09. The annealed billet was subjected to cold drawing to a diameter of 1.3 mm with intermediate annealing at a diameter of 4.5 and 2.5 mm according to the specified mode. The heat-treated finished wire had mechanical properties: temporary tensile strength of 27 kgf / mm, elongation (5 33%, the number of bends n, 30. The results of all examples performed while maintaining the conditions of example 1 and differing by individual parameters are summarized in table.

Claims (1)

SUMMARY OF THE INVENTION A method of manufacturing a coated steel wire, preferably with a thicker coating of softer metal, comprising cleaning the contact surfaces of the sheath and core, forming a sheath around the core, followed by welding the edges. Sheaths and drawing of the obtained bimetallic billet, characterized in that , in order to improve the mechanical properties of the wire and increase the yield, they form a sheath around the core by extruding the sheath metal core from the width profile oh equal to the width and height of a bimetallic billet is not less than 2.3 times the thickness of the shell in the bimetallic workpiece, the extrusion process is carried out at a ratio of yield strength of the core metal and the shell is not less than 20.