How to Avoid Stress Concentration in the Cold Drawing Process of Tungsten Wire?

During the cold drawing process, tungsten wire may have stress concentration problems, which will affect its performance and service life. In order to avoid stress concentration, the following measures can be taken:

  1. Optimize the cold drawing process

Reasonably control the degree of deformation:

Within a certain temperature range, as the degree of deformation increases, the microstructure will change, thereby affecting the stress state of the tungsten wire. Therefore, it is necessary to reasonably control the degree of deformation of cold drawing to avoid stress concentration caused by excessive deformation.

Use appropriate cold drawing speed:

Cold drawing speed that is too fast may cause uneven stress distribution inside the tungsten wire and increase the risk of stress concentration. Therefore, an appropriate cold drawing speed should be selected to ensure that the tungsten wire can be uniformly deformed during the cold drawing process.

Maintain the stability of cold drawing temperature:

Temperature fluctuations may cause changes in the stress state of the tungsten wire during the cold drawing process. Therefore, it is necessary to maintain the stability of the cold drawing temperature to reduce stress concentration caused by temperature changes.

  1. Improve tungsten wire material

Improve the purity of tungsten wire:

The higher the purity of the material, the fewer internal defects it has and the lower the risk of stress concentration. Therefore, internal defects can be reduced by increasing the purity of tungsten wire, thereby reducing the possibility of stress concentration.

Refine grains:

Grain refinement can reduce the brittleness of the material and improve toughness, thereby helping to reduce stress concentration. Grain refinement can be achieved by adjusting the preparation process of tungsten wire.

  1. Optimize the structural design of tungsten wire

Avoid sudden changes in cross-sectional dimensions:

Sudden changes in cross-sectional dimensions are a common cause of stress concentration. Therefore, in the design process of tungsten wire, sudden changes in cross-sectional dimensions should be avoided as much as possible to reduce the risk of stress concentration.

Use rounded corner design:

In the geometric shape of tungsten wire, protruding corners, grooves, etc. are prone to cause stress concentration. Therefore, rounded corner design can be used to replace sharp corners to reduce the degree of stress concentration.

Increase transition curve:

For geometric shapes such as grooves or holes, transition curves can be added to relieve stress concentration. By optimizing the geometric shape of tungsten wire, the risk of stress concentration can be effectively reduced.

  1. Strengthen quality inspection and control

Strictly inspect the quality of tungsten wire:

During the cold drawing process, the tungsten wire should be strictly inspected for quality, including surface quality, internal defects, etc. The risk of stress concentration can be reduced by timely detection and handling of quality problems.

Control parameters during cold drawing:

Strict control should be carried out on various parameters during cold drawing, such as deformation degree, cold drawing speed, temperature, etc. By accurately controlling these parameters, it can be ensured that the tungsten wire can be deformed evenly during the cold drawing process, reducing the possibility of stress concentration.

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