大型曲轴圆角滚压矫直跳动量的解析模型研究  

Study on the analytical model of runout for fillet rolling straightening of large crankshafts

作　　者：罗远新[1] 曹锋 易丽群 王开剑 黄剑飞 LUO Yuanxin;CAO Feng;YI Liqun;WANG Kaijian;HUANG Jianfei(Chongqing University,College of Mechanical and Vehicle Engineering,Chongqing 400044,China;Chongqing Changan Wangjiang Industry Group Co.,Ltd.,Chongqing 400020,China;Guilin Fuda Alfing Large Crankshaft Co.,Ltd.,Guiling 541199,China)

机构地区：[1]重庆大学,机械与运载工程学院,重庆400054 [2]重庆长安望江工业集团有限公司,重庆400020 [3]桂林福达阿尔芬大型曲轴有限公司,广西桂林541199

出　　处：《重型机械》2024年第6期29-39,共11页Heavy Machinery

基　　金：广西科技重大专项资助项目(桂科AA21077002)。

摘　　要：大型曲轴中频淬火后,热变形和冷却不均会导致轴颈发生局部弯曲变形,为保证几何尺寸和减少后续加工余量,热处理后需采用圆角滚压矫直工艺来实现对大型曲轴的矫直。本文以16V型大型曲轴为研究对象,探讨了滚压矫直复合弹塑性成形过程中的变形规律,推导研究了任意滚压角度下滚压不同轴颈时曲柄臂偏转角与主轴颈跳动量的数学关系,结合贝叶斯优化的SVM方法建立了偏转角的预测模型,实现了任意滚压角度滚压后主轴颈跳动量的计算;基于离散化思想,提出了在滚压角度范围内矫后主轴颈跳动量的计算方法,进而构建了一种可靠的大型曲轴主轴颈矫后跳动量的解析模型,并开展了验证实验,解析结果与实验结果具有较好的一致性。After medium-frequency induction hardening,large crankshafts can experience local bending deformation at the journals due to thermal distortion and uneven cooling.To ensure geometric accuracy and reduce subsequent machining allowance,it is necessary to employ fillet rolling straightening techniques on large crankshafts post-heat treatment.This paper focuses on a 16V-type large crankshaft,exploring the deformation patterns during the combined elastic-plastic forming process of rolling straightening.It derives the mathematical relationship between the crank arm deflection angle and the main journal runout for various rolling angles when rolling different journals.By integrating the Bayesian optimized Support Vector Machine(SVM)method,a prediction model for the deflection angle was established,enabling the calculation of the main journal runout for any rolling angle.Based on the discretization concept,a method for calculating the post-straightening main journal runout within the rolling angle range was proposed.A reliable analytical model for the runout of the main journal after straightening was constructed,and validation experiments were conducted.The analytical results showed good consistency with the experimental results.

关 键 词：大型曲轴 滚压矫直 跳动量 支持向量机 贝叶斯优化 

分 类 号：TG306[金属学及工艺—金属压力加工]