The fracture stress of tungsten wire during the wire drawing process is a complex parameter, which is affected by many factors, including the material properties of tungsten wire, wire drawing process parameters (such as pass compression rate), die design, and stress distribution during the wire drawing process. Therefore, it is impossible to give a specific value to describe the fracture stress of tungsten wire during the wire drawing process in all cases.
However, the main factors affecting the fracture stress of tungsten wire can be analyzed:
Material properties: The purity, grain structure, and work hardening characteristics of tungsten wire will affect its fracture stress. High-purity tungsten wire usually has better mechanical properties and higher fracture stress. Fine grain structure helps to reduce stress concentration and improve the toughness of tungsten wire.
Wire drawing process parameters: Pass compression rate is an important parameter in the wire drawing process, which directly affects the deformation degree and stress distribution of tungsten wire. When the pass compression rate is large, the tungsten wire is subjected to greater compressive stress at the entrance end of the wire drawing die, which may lead to greater tensile deformation and higher fracture stress. At the same time, wire drawing speed, lubrication conditions, etc. will also affect the fracture stress of tungsten wire.
Die design: The angle, shape and size of the wire drawing die will affect the stress distribution and fracture stress of the tungsten wire during the wire drawing process. Reasonable die design can reduce stress concentration and reduce the risk of fracture stress.
Stress distribution: During the wire drawing process, the tungsten wire is subjected to axial tensile stress and radial compressive stress. When the tensile stress is too large or unevenly distributed, it will cause the tungsten wire to break. Therefore, understanding and controlling the stress distribution during the wire drawing process is crucial to preventing fracture.
In practical applications, experimental tests are usually required to determine the fracture stress of tungsten wire during the wire drawing process. By adjusting the wire drawing process parameters, optimizing the die design and improving the lubrication conditions, the fracture stress of tungsten wire can be reduced, and the wire drawing efficiency and product quality can be improved.
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