JPS5953332B2 - Manufacturing method of deformed steel wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a simple manufacturing method for manufacturing a deformed steel wire, which makes the hardness distribution of the cross section of the deformed steel wire uniform, and is suitable for mass production with less seizure and wear of the deformed die. It is something.

In the production of low to high carbon steel and alloy steel deformed wires with a carbon content of up to 0.9%, conventionally hot-rolled and directly heat-treated wires are drawn by a certain area reduction rate using rolling rolls. Generally, the round wire is cold-rolled into a plate or irregular shape, and then drawn using a modified die, or a round wire is heat-treated and then directly drawn using a modified die to obtain a modified shape.

At this time, the processing that the wire undergoes changes from a round wire to a deformed wire in the cold, so the processing is uniform across the cross section. However, since some parts are locally subjected to strong processing, the hardness distribution in the cross section of the profile wire becomes uneven, and the die tends to seize during drawing with the final profile die, shortening the life of the die. It had a point.

The present inventors have conducted repeated research to provide a method for manufacturing deformed steel wire that does not have the above-mentioned problems.
, 1-0.9% C10, 5-0.8% Mn, 0.2-0
．． 3% Si) into an irregular shape other than circular, a patenting treatment is performed in a hot water bath at 70°C or higher to impart drawability to the carbon steel wire with an irregular cross section, and the irregular shaped wire is The present invention was achieved by discovering that a method of continuous cold wire drawing using a die of the same shape after pickling is suitable for the above purpose.

The deformation of carbon steel materials can be carried out extremely easily by using deformed groove rolls as the last or several final rolling rolls during hot rolling.

When the irregularly shaped wire rod obtained by the method of the present invention is drawn using a die, the deformation of the steel wire within the die becomes uniform, so there is no local increase in friction at the contact surface between the die and the steel wire. Die seizure and wear are reduced and die life is increased.

Furthermore, as a result of being subjected to uniform deformation, the hardness distribution in the cross section of the deformed steel wire also becomes uniform.

Example 1 A 4, Ommφ circular cross-section steel wire containing 0.71%C10, 23%Si, and 0.46%Mn was cold-rolled to a 1.5%
A conventional method (A) in which wire is drawn with a modified die having a shape of 1.5 mm, and a book in which the steel material is hot rolled into a modified shape, then directly led to a hot water tank for patenting, and then drawn continuously with a modified die. FIG. 1 shows the cross-sectional hardness distribution of a deformed steel wire (square cross section, 1.5 x 1.5 mm) obtained by the method of the invention.

According to this, compared to the conventional method in which the hardness level differs in the vertical and horizontal directions, in the present method the hardness difference is smaller and the hardness distribution is more uniform than in the conventional method.

In addition, as a result of examining the lifespan of a 1.5 x 1.5mm die, good results were obtained: 2 tons for the conventional method and 4 tons for the present method, which is twice as long as the conventional method.

[Brief explanation of drawings]

FIG. 1 is a graph comparing the cross-sectional hardness distribution of deformed steel wires obtained by the conventional method (5) and the method (B) of the present invention.

Claims (1)

[Claims] 1 Carbon steel material (0.1~0.9%C10.5~0.8%
In manufacturing deformed steel wire from (Mn, 0.2-0.3% Si), after deforming in the last or several final rolling rolls during hot rolling, in a hot water bath at 70°C or higher. A method for manufacturing a deformed steel wire, which comprises continuous cold drawing of a directly patented deformed wire through a deformed die.