齿轮轴激光熔覆轴变形的分析与控制

建立齿轮轴齿面激光熔覆过程中的应力场数值计算模型,利用有限元计算分析软件ANSYS对激光熔覆过程中齿轮轴的径向变形量进行了数值分析。计算结果表明,在采取顺序熔覆的工艺条件下,齿轮轴的径向变形将无法避免,且变形量随着扫描次数的增加而加剧,若无其他控制形变的措施,则必然导致其形变超出允许范围。采取对称熔覆工艺,可对轴的径向变形产生一定的补偿和抵消效果,有益于控制齿轮轴形变。对采用两种熔覆工艺后的轴径向变形分别进行了试验和测量。试验结果表明,采取对称熔覆工艺后,其径向跳动量小于顺序熔覆工艺条件下的1/3,计算分析与试验结果吻合,说明该工艺具有较好的控制齿轮轴形变的作用,可以推广应用于其他轴类零部件的激光熔覆修复工作。

Analysis and controlling of deformation of gear shaft in laser cladding on teeth surfaces

Numerical calculation model of stress field in the process of laser cladding on tooth surface of gear shaft was established.Radial displacement of shaft was calculated with finite element analysis software-ANSYS.The results show that radial distortion could not be avoided when the teeth be sequential clad.And the distortion would be aggravated with the increasing times of scanning.This distortion would exceed the accepted value if no controlling measure is adopted.Calculation results also show that the radial distortion of shaft would be compensated at a certain extent when symmetrical cladding craft was applied.Radial distortion values of gear shaft were measured after two kinds of cladding crafts in experiment.Experiment results show that the radial displacement value of shaft in process of symmetrical cladding was less than one-third of radial distortion value in process of sequential cladding.Experiment results were consonant with calculation results.It was shown that symmetrical cladding craft is effective for controlling distortion of gear shaft in process of laser cladding on teeth surfaces.And this craft could be applied to the repairing work of other parts that similar with gear shaft.