During drawing, Medical titanium wire The stress state of drawing is a three direction principal stress and two direction stress state. Compared with the principal stress state of compression stress in three directions, drawing titanium wire is easier to reach the plastic deformation state. The deformation state of the drawing process is the three-way main deformation state, which is not conducive to the plastic development of metal materials, and is prone to produce or expose surface defects.

The pass deformation of medical titanium wire drawing process is limited by the safety factor. When the pass deformation is small, there are more drawing passes. Therefore, multi pass continuous high-speed drawing is often used in the production of titanium wire.

Drawing below recrystallization temperature is cold drawing, drawing above recrystallization temperature is hot drawing, and drawing above room temperature and below recrystallization temperature is warm drawing. Cold drawing is widely used in the production of metal wire rod. During hot drawing, the titanium wire is heated before entering the die hole, which is mainly used for drawing titanium wires of high melting point metals such as tungsten, molybdenum, etc.

In the process of heating up, titanium wire can enter the die hole for drawing only when it is heated to a certain temperature range by heater. It is mainly used for drawing zinc wire, hard deformation alloy wire such as high-speed steel wire and bearing steel wire.

In the process of drawing, in the process of drawing, only when one die is drawn, it is single pass drawing, and continuous drawing is performed on several (2~25) passes of die. Single pass drawing has low linear speed, low productivity and low labor productivity. It is commonly used for drawing large wire, low plasticity, profiled wire and wire rod.

Multi pass drawing, with high wire speed, high mechanization and automation, and high production efficiency, is the main way of titanium wire and line production. The drawing machine can be divided into non sliding continuous drawing and sliding continuous drawing. According to lubrication status, wet drawing is used with liquid lubricant, and dry drawing is used with solid lubricant. According to the shape of the tensile section of titanium wire, it can be divided into round wire and profiled wire. The tension on the titanium wire under tension is divided into positive tension drawing and reverse tension drawing. There are also special drawing, such as roller die drawing. In order to produce the plastic processing technology of small section steel wire or non-ferrous metal wire, wire rod or wire blank is pulled out from the die hole of the drawing die under the effect of the drawing force.

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