Preparation method of high-melting-point metal wire

Abstract

The invention discloses a preparation method of a high-melting-point metal and alloy wire, and belongs to the field of processing of materials. The preparation method of the high-melting-point metal and alloy wire comprises the following specific steps: electrifying a drawn wire with alternating current and direct current so that the drawn wire is self-heated to reach a thermal machining temperature under the effect of current and a wire drawing process can be carried out at a large cross sectional area deformation ratio; meanwhile arranging a two-potential testing end in a wire heating section and measuring a potential value of a specific section of the drawn wire; accurately measuring the temperature of the wire according to the characteristics of resistance and temperature of the measured wire; and the heating power of the drawn wire is controlled by adjustment of fed current. Therefore, it can be ensured that wire drawing is carried out at a checked process temperature of the material. The method has the characteristics of high production efficiency, small product crystalline grains, zero raw material loss in a production process and the like.

Description

technical field [0001] The invention relates to a method for preparing a high melting point metal wire, belonging to the field of material processing. Background technique [0002] The wire drawing process belongs to the category of metal pressure processing. The principle is that the cross-sectional area of ​​the metal is compressed after passing through the die under the action of external force, so as to obtain the required cross-sectional area and shape. The traditional wire drawing process generally uses a group (5~8) of wire drawing dies from large to small to The workpiece is drawn into wire at room temperature. For high-melting point metals, because of their high hardness at room temperature, the wire material is generally energized directly or crucible furnace heating is used to make the wire-drawn material reach the thermal processing temperature. Furnace heating" mode, resulting in different temperatures of the metal wire passing through the mold during the drawi...

AI Technical Summary

Problems solved by technology

[0004] A method for preparing high-melting-point metal wires, which solves the problem of temperature measurement and control of high-melting-point wires in the wire drawing process, can precisely control the thermal processing temperature, avoids the problems of overheating and insufficient heating, reduces wire processing losses, and has production efficiency High, stable product performance and other characteristics, specifically include the following steps: make the wire move at a constant speed during the wire drawing process, pass a current on the wire, the wire will heat itself under the action of the current, and measure the potential between any distance in the wire heating section Combined with the resistance temperature characteristics of the wire, the temperature value of the measured section can be obtained. According to the measured temperature value, the current of the input wire can be adjusted to control the heating power of the wire to ensure that the wire temperature is at the set value when the wire reaches the drawing die. It is carried out at the temperature of the wire drawing process, and finally the metal wire is obtained

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