应用Nd∶YAG激光加工连杆初始裂解槽

为改善连杆裂解槽加工精度和质量,进而提高裂解连杆的成品率,通过试制两种连杆产品,确定了激光加工参数。采用Nd∶YAG固体激光器对两种类型的连杆进行了裂解槽激光加工试验,分析了采用不同切割参数加工的裂解槽质量,并对激光切割参数进行了优化。结果表明:激光峰值功率、离焦量、切割速度、脉冲频率、辅助气体压力、激光入射角等对裂解槽的加工质量均有很大的影响,其中激光峰值功率2.4kW,脉冲时间0.4ms时,切槽深度为0.453～0.457mm,当脉冲频率与切割速度比值约为3,在非正离焦量状态下,所加工的裂解槽对连杆的裂解非常有利,能够满足M0406连杆的裂解质量要求。

Manufacture of connecting-rod initial splitting notch by Nd:YAG solid laser

In order to improve the processing precision and quality of a connecting-rod splitting notch and to improve its manufacturing yield, two kinds of connecting-rod products were manufactured and laser processing parameters were also determined. The splitting notch processing on two kinds of connecting rods was carried out by a Nd∶YAG solid laser and then the influence of different cutting parameters on the cutting quality was analyzed and the laser cutting parameters were optimized. The result shows that the laser peak power, clearance between focus and plate, cutting speed, impulse frequency, assistant air pressure, and the angle of laser incidence have a great influence on the processing quality of splitting notch. When the peak power of laser is 2.4 kW and the impulse time is 0.4 ms, the depth of cutting notch is 0.453-0.457 mm. Moreover, when the ratio between impulse frequency and cutting speed is 3, the splitting notch processed is conductive to the splitting of connecting rod in the condition of the minus clearance between focus and plate, which can meet the demand of the splitting quality of M0406 connecting-rods.