激光金属直接成形, 波形特征, 数值模拟, 精度

For the problem fabricating a part with small feature size in

the LDMF process, the influence of laser waveform features on the accuracy of direct metal forming was studied through numerical simulation and experiments. Research shows: compared with the continuous wave, square wave and sine wave have higher rates of heating and cooling, and the square wave has the greatest temperature gradient. Under the conditions of the same average output power, square wave and sine wave make the molten pool reach a higher temperature. As to the same process, direct metal forming with square wave only requires smaller average output power, which reduces the heat input and improves the accuracy of the direct metal forming by reducing the heat-effected zone. The part with smallest feature size can be got by square wave in the process of thin-walled part forming, which improves the accuracy of LDMF.

laser direct metal forming(LDMF), different waveform, numerical simulation,