Titanium material has the characteristics of light weight, high strength, good corrosion resistance, good high temperature resistance, low temperature resistance, strong acid resistance, strong alkali resistance, and low density. Due to its stable chemical properties, , it is called "space metal", "smart metal", "biological metal", "all-around metal".
Titanium and titanium alloy wire and Various metals of different section shapes and sizes of wire can be produced by drawing. Under the action of drawing force, the wire rod or wire blank is pulled out of the die hole of the wire drawing die. The drawn wire has precise size, smooth surface, and simple drawing equipment and mold used, and is easy to manufacture. When drawing the ultra-fine wire with a drawing diameter less than 0.05mm, it is difficult to pass the die. In order to improve the stability of the drawing process, reduce the number of breaking and passing the die, and improve the drawing production efficiency, the safety factor K value greater than 2.0 can be adopted.
The drawing above the recrystallization temperature is hot drawing, and the drawing below the recrystallization temperature above room temperature is warm drawing. Cold drawing is the most common drawing method used in wire and wire production. When hot drawing, the metal wire should be heated before entering the die hole, mainly used for drawing high melting point metals such as tungsten, molybdenum and other metal wires. Warm drawing, the metal wire also needs to be heated by the heater to the specified range of temperature before entering the die hole for drawing, mainly used for zinc wire, difficult to deform alloy wire such as high-speed steel wire, bearing steel wire drawing.
According to the number of molds passed by the wire at the same time in the drawing process, the drawing only through a mold is a single pass, and the drawing successively through a number of (2 ~ 25) molds is a multi-pass continuous drawing. Single pass drawing line speed is low, productivity and labor productivity is low, often used for large diameter, low plasticity and special-shaped wire, wire drawing. The high speed of multi-pass drawing, high degree of mechanization and automation, high productivity and labor productivity, is the main way of wire and wire production. It is divided into non-sliding continuous drawing and sliding continuous drawing.According to the state of the lubricant used in drawing, the use of liquid lubricant is wet drawing, and the use of solid lubricant is dry drawing.
According to the section shape of the drawn wire, there are circular wire drawing and special-shaped wire drawing.
According to the tension points acting on the drawn wire, there are positive tension drawing and reverse tension drawing.
There are special drawing, such as roller die drawing.
Process characteristics: the stress state of the metal wire drawing is the three-way principal stress state of the two-way compressive stress and the tensile stress. Compared with the principal stress state of the three-way compressive stress, the drawn metal wire is easier to reach the plastic deformation state.
The deformation state of drawing is the three-way main deformation state of bidirectional compression deformation and tensile deformation, which is unfavorable to the plasticity of metal materials and easier to produce and expose surface defects. The pass deformation of metal wire drawing process is limited by its safety factor. If the pass deformation is small, the drawing pass is more, so multi-pass continuous high-speed drawing is often used in the production of metal wire.
