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China Pressed ventilation elbow processing needs attention
When China Pressed ventilation elbow is processed, it is usually carried out at room temperature, cold drawn to produce plastic deformation, and then improve the yield strength.
When China Pressed ventilation elbow is processed, it is usually carried out at room temperature, cold drawn to produce plastic deformation, and then improve the yield strength. This process is called cold drawn strengthening. The principle of china Pressed ventilation elbow is that the defects of the lattice increase during the plastic deformation of the elbow, and the severe distortion of the lattice of the defects will hinder the further sliding of the lattice when the elbow is pushed. The quality and service life of the elbow make the yield point of the elbow increase, and the plasticity and toughness decrease. Because of the internal stress generated in the plastic deformation, the elastic modulus of the elbow decreases.
At this time, store the cold-drawn steel bars at room temperature for 15-20 days or heat them to 100-200°C for a certain period of time. This process is called aging treatment. China Pressed ventilation elbow is subjected to aging treatment after cold drawing, the yield point is further improved, the ultimate tensile strength is also increased, and the plasticity continues to decrease. Due to the reduction of internal stress during the aging process, the elastic modulus can be basically restored.
The stress control of China Pressed ventilation elbow is very important. After cold drawing, the pushed elbow is used as prestressed steel bar, and the cold drawing stress should be used to dominate. However, after the cold drawing of the steel bar, it was checked that the cold drawing rate exceeded the standard value, and mechanical performance was required. China Pressed ventilation elbow's cold drawing rate determination operation control is equally important.
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