A kind of titanium alloy fine blanking forming method

Abstract

The present invention proposes a titanium alloy fine-blanking forming method. For TC4 titanium alloys of different thicknesses, fine-blanking is carried out by using finite element and experimental methods to obtain blank holder force, anti-deterministic force and stamping speed. The influence relationship of the hydrostatic pressure stress in the cutting strip, and then use the fracture criterion to judge the cracks under the hydrostatic pressure stress. Through a large number of experiments and simulation data fitting, the blank holder force and anti-bracket force obtained in the patent are obtained. The design relationship curve of force and blanking speed can be used to obtain the optimal combination of blank holder force, reverse jacking force and blanking speed, that is, the blank holder force and reverse jacking force increase continuously with the fine blanking process. , the punching speed is continuously reduced, so that the material in the shear zone is always in a good hydrostatic stress state, and a good shear bright zone is obtained. The invention realizes the fine blanking forming of the titanium alloy material, has high production efficiency, high utilization rate of raw materials, and good surface quality of formed parts.

Description

technical field [0001] The invention belongs to the technical field of fine blanking forming of metal sheets, and in particular relates to a fine blanking forming method of titanium alloy. Background technique [0002] Fine blanking is an advanced metal plastic forming process. The blanking section of fine blanking parts has a large bright band, high precision in size and shape, smooth surface, and high production efficiency of fine blanking. During the fine blanking process, since the blank is firmly pressed by the V-shaped blank holder and the reverse top plate, the material in the shear deformation zone is in a state of three-dimensional compressive stress, and the metal in the shear zone can be deformed in a pure shear manner, thereby ensuring fine blanking The piece gets a high-shine band. In the existing fine blanking process, blank holder force, back pressure and stamping speed are kept constant during the entire fine blanking process according to the initially set v...

AI Technical Summary

Problems solved by technology

However, surface integrity defects such as surface roughness, tears caused by built-up edge, and microcracks caused by milling of TC4 titanium alloys seriously damage the fatigue life performance of titanium alloy components.

In addition, machining also has disadvantages such as low efficiency and low material utilization rate. Therefore, the use of machining to manufacture medium-thick plate titanium alloy aviation components does not meet the development needs of the modern aviation industry.

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