C194铜合金薄板激光弯曲试验及力学性能分析

采用脉冲激光对C194铜合金进行激光弯曲成形试验,研究激光参数对弯曲角度的影响规律,并对弯曲前后试件的抗拉强度、载荷位移曲线、显微硬度、表面形貌和表面粗糙度进行对比分析.结果表明:板料弯曲角度随激光功率、离焦量的增大呈先增大后减小的趋势,随扫描速度的增大而减小,随扫描次数的增加而逐渐增大,且扫描次数较少时,两者呈近似线性关系；激光弯曲成形后的试件抗拉强度,随激光功率的增加呈逐渐减小趋势,但低功率条件下的晶粒细化效果反而提高了成形件的抗拉强度；成形后试件扫描区硬化作用并不明显,平均硬度比母材仅提高了3.3％；激光弯曲工艺产生的不均匀温度场使板料面粗糙度和x,y向截面粗糙度均有不同程度的增加.

Laser bending experiment and mechanical properties analysis of C194 copper alloy sheet

The laser bending test of C194 copper alloy was conducted by pulsed lasers to investigate the effect of laser parameters on bending angle.The tensile strength,load displacement curve,micro-hardness,surface topography and surface roughness before bending were compared with those after bending.The results indicate that the bending angle increases firstly and then decreases with the increase of laser power and defocusing distance.The bending angle decreases with the increases of scanning velocity,while increases with the increase of scanning times.The relationship between scanning times and bending angle shows approximate linearity for low scanning cycle.The tensile strength is decreased by the increase of laser power,while increased by refining grain at low power condition.There is no obvious stiffening in bended specimen with average surface hardness increasing by 3.3%.The surface roughness and section roughness in x,y direction of sheet metal are increased at different degree by the uneven temperature field induced from laser bending process.