连杆模锻工艺参数优化

Optimization of die forging processparameters for connecting rod

为提高连杆锻件的成形质量和材料利用率、增加模具使用寿命,根据连杆锻件的外形尺寸对坯料结构进行修正,基于响应面法研究不同工艺参数的交互作用对预锻成形载荷、终锻件损伤值、终锻模具磨损深度的影响,并结合Multi-Island遗传算法进行多目标优化。结果表明:坯料结构修正后,锻件成形质量良好,坯料体积为65354.1 mm^(3),材料利用率提高了23.5%。通过方差分析可知,各工艺参数对预锻成形载荷的影响程度依次为:坯料温度>摩擦因数>上模速度>模具温度;对终锻件损伤值的影响程度依次为:摩擦因数>坯料温度>上模速度>模具温度;对终锻模具磨损深度的影响程度依次为:坯料温度>摩擦因数>模具温度>上模速度。修正后的成形载荷为3210 kN,降低了51.7%;锻件损伤值为0.547,降低了12.3%;模具磨损深度为0.0389μm,降低了22.4%,优化效果显著,可为模锻成形工艺参数优化及连杆实际生产提供参考。

In order to improve the forming quality and material utilization rate of connecting rod forgings and increase the service life of die,the billet structure was modified according to the shape and dimension of connecting rod forgings,and the influences of the interaction of dfferent process parameters on the pre-forging forming load,final forging damage value and final forging die wear depth were investiga-ted based on the response surface method.Then,multi-objective optimization was carried out by combining Multi-Island genetic algo-rithm.The results show that the forming quality of forgings is good after the modification of billet structure,the volume of billet is 65354.1 mm^(3),and the material utilization rate is increased by 23.5%.Through variance analysis,it can be seen that the influence de-gree of each process parameter on the pre-forging forming load is billet temperature>friction factor>upper die velocity>die temperature,the influence degree on the damage value of final forgings is friction factor>billet temperature>upper die velocity>die temperature,and the influence degree on the die wear depth is billet temperature>friction factor>die temperature>upper die velocity.The optimized forming load is 3210 kN,which is reduced by 51.7%,the damage value of forgings is 0.547,which is reduced by 12.3%,and the die wear depth is 0.0389μm,which is reduced by 22.4%.Thus,the optimization effect is significant,which can provide reference for the optimization of die forging process parameters and the actual production of connecting rod.