TA2板料激光热应力弯曲成形及其力学性能研究

用HVS-1000显微硬度测试仪、X-350A型X射线应力测定仪,以2.5 kW SM2000SM快轴流CO2激光器对0.6 mm厚的TA2板料进行扫描,按照正交试验理论安排成形工艺参数,研究了TA2板料弯曲成形时主要工艺参数对弯曲角度的影响,以及试样表面残余应力的分布和试样断面上的显微硬度变化。结果表明：正交试验中的4个工艺参数的作用是不同的,按其变化对弯曲变形量影响的大小排序,依次是扫描次数、光斑直径、激光束功率、扫描速度;成形参数对试样表面的残余应力分布也存在一定的影响;试样变形区断面上的显微硬度变化呈现出一定的规律。

Study on TA2 Sheet Metal Bending With Thermal Stress Induced by Laser and Its Mechanical Properties

A 2.5 kW CO2 laser, a HVS -1000 Micro-hardness measuring instrument and an X -350A X - ray stress measuring instrument were adopted in the experiment where 0.6mm - thickn sheet steel of TA2 was studied to evaluate the process parameters of bending with thermal stress induced by laser. Bending angle was measured as the function of main processing parameters. These processing parameters were arranged according to the theory of orthotropic experiment. Distribution of residual stress on the surface and variation of micro-hardness on the cross section of samples were studied after forming. The results show that these parameters bring different effects. The number of passes ranks first, followed by laser spot in terms of their effect on the bending angle, with power of laser beam and scan speed being the last two factors. Parameters of laser forming also have some influence on the distribution of residual stress on the surface of samples. Certain regularity appears in the variation of micro- hardness on the cross section of samples.