Numerical analysis and experimental research of collapsing of tooth-tip in laser cladding on teeth surfaces

Temperature field of laser cladding on the surface of gear shaft is numerical simulated with finite element analysis software - ANSYS. The simulation results showed that the heat caused by laser beam was concentrated in the tooth seriously, and especially in tooth-tip. Excessive melt down and collapsing of tooth-tip would be easily brought about by the heat if the tooth side and tooth-tip be cladded at the same time. And the significance of repairing would be lost as a result of this problem. The results of analysis and experiment show that at least two scanning should be executed in the process of laser cladding on teeth surfaces. In the first scanning, dimension of laser beam should be reduced properly. And the tooth-tip should not be irradiated directly by laser beam. After the first scanning, the gear should be circumrotated a certain angle. And the included angles between the two sides of tooth-tip and horizontal plane are approximately equal. Then the second scanning could be prosecuted at the tooth-tip. Experiment results show that continuous and compact cladding coat can be gained by this craft. It is proved that this technological craft is reasonable and effective.