CS255482B1 - Method of z-wire production - Google Patents

Abstract

Method of making "Z" wire for closed supporting ropes of semi-finished round profile it is that pressure deformation performed perpendicular to the profile diagonal. Relative total reduction after five to seven passes is 25 to 42%. Subsequent passages are 6 to 12% relative reduction.

Description

Manufacturing method Made of wire for closed carrier ropes from a circular profile blank by successive passes on a stretch rolling mill.

The prior art methods of making wire do not permit the production of wire with strengths greater than 1200 or up to 1400 MPa when using a hot-rolled profiled blank and subsequently drawn in carbide girders. At higher strengths of such a drawn wire, an undesirable martensitic structure is formed on the surface. The reason for its formation is the generation of a large amount of heat generated by friction of the wire against the walls of the carbide die, which cannot be dissipated to a sufficient extent.

Also, the production of wire in the driven rollers does not achieve the required quality of the wire, in particular due to insufficient and uneven overall deformation with low subsequent stiffness.

The aforementioned drawbacks are eliminated by the production method of the wire for closed carrier ropes from a circular profile blank where the compression deformation is performed perpendicular to its diagonal. The relative total reduction after five to seven passes is 25 to 42%. The successive passes are a relative reduction of 6 to 12%,

The advantage of the method according to the invention for the production of wire from closed wire ropes consists in the gradual deformation of the material over the entire cross-section with a uniform surface and core structure. This achieves high mechanical values with a strength higher than 1,400 MPa.

The attached drawing shows the procedure of calibration from the wire from the blank to five passes.

An exemplary embodiment of the production of a 5 mm profile wire is based on a 6.1 mm round section with a carbon content of 0.64%. Pressure deformation is performed perpendicular to the profile diagonal by stretch rolling in successively shaped gauges.

cross-section mm '

Intermediate (or 6.1 mm) F O = 29.22 1st pass ^F 1 = 26.72 Pass 2 ^F 2 = 24.45 3rd pass ^F 3 = 22.38 4th pass ^F 4 = 20.44 5th pass final shape ^F 5 = 18.7

Relative reduction of the transverse surface in individual cuts:

^ 3 ^ 4 * 5

8.55%

8.49%

8,46%

8.66%

8.51%

Total reduction ratio:

%

The achieved Z-strength of the wire with a profile height of 5 mm is 1570 MPa by the treatment according to the invention.

Claims (2)

SUBJECT OF THE INVENTION 1. A method of manufacture of a wire for closed carrier ropes from a circular profile blank, wherein the compression deformation is performed perpendicular to its diagonal, characterized in that the relative total reduction after five to seven passes is 25 to 42%. 2. A method according to claim 1, wherein the successive passages are a relative reduction of 6 to 12%.