材料力学性能对装配式凸轮轴球体扩径连接性能的影响
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摘要
为给球体扩径连接装配式凸轮轴在结构设计和材料优化匹配阶段提供相应的理论依据,应用弹塑性力学分析了弹性模量和屈服强度对球体扩径连接的影响,并根据不同材料匹配下相应的应力-应变曲线分析了球体扩径连接过程,给出了不同材料对应凸轮和轴体的连接条件,最后完成了扩径连接试验。结果表明:凸轮和轴体材料的弹性模量和屈服强度是球体扩径连接的关键,直接决定着扩径后凸轮和轴体弹性回复量的大小;在凸轮弹性模量小于轴体弹性模量情况下,可以不考虑凸轮和轴体材料的屈服强度;对于凸轮和轴体材料弹性模量相接近的情况,只有轴体屈服强度小于凸轮屈服强度才能够实现扩径连接。
In order to provide corresponding theoretical basis for structure design and material optimal matching of assembled camshaft on ball expanding and connection,the influences of Young's modulus and yield strength on ball expanding and connection were analyzed by elastic-plastic mechanics,and the ball expanding and connection process was analyzed according to the corresponding stress-strain curve of different material matching. Then,the connection conditions of corresponding cam and shaft for different materials were given,and the expanding and connection experiment was completed. The results show that the key factors in ball expanding and connection process are Young's modulus and yield strength of cam and shaft,which decide the elastic recovery values of cam and shaft after expanding process.Furthermore,the yield strength of cam and shaft may not be considered when the Young' s modulus of cam is smaller than that of shaft.However,when the Young's modulus of cam and shaft are approximate,the expanding and connection process can be realized as long as the yield strength of shaft is smaller than that of cam.
In order to provide corresponding theoretical basis for structure design and material optimal matching of assembled camshaft on ball expanding and connection,the influences of Young's modulus and yield strength on ball expanding and connection were analyzed by elastic-plastic mechanics,and the ball expanding and connection process was analyzed according to the corresponding stress-strain curve of different material matching. Then,the connection conditions of corresponding cam and shaft for different materials were given,and the expanding and connection experiment was completed. The results show that the key factors in ball expanding and connection process are Young's modulus and yield strength of cam and shaft,which decide the elastic recovery values of cam and shaft after expanding process.Furthermore,the yield strength of cam and shaft may not be considered when the Young' s modulus of cam is smaller than that of shaft.However,when the Young's modulus of cam and shaft are approximate,the expanding and connection process can be realized as long as the yield strength of shaft is smaller than that of cam.
引文
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[2]乔健,寇淑清,孔巧玲,等.球体扩径连接装配式凸轮轴装配过程分析[J].吉林大学学报:工学版,2010,41(z1):115-120.Qiao J,Kou S Q,Kong Q L,et al.Analysis of hollow camshaft assembled process on expanding tube connection by pushing through a ball[J].Journal of Jilin University:Engineering and Technology,2010,41(z1):115-120.
[3]Zhang P,Kou S Q,Zhu H,et al.Analysis for transverse knurling process of assembled camshaft[J].Applied Mechanics and Materials,2014,3558(670):485-489.
[4]Qiao J,Kou S Q,He D Y,et al.Torque and influencing factors analysis for assembled camshaft[J]Materials Science Forum,2008,720(575):216-221.
[5]刘建彬,夏正文,皮华春,等.内压状态下不同弹性模量双金属管的力学分析[J].塑性工程学报,2016,23(1):136-140.Liu J B,Xia Z W,Pi H C,et al.Mechanical analysis of bimetal clad pipes with different Young’s modulus under inner pressure[J].Journal of Plasticity Engineering,2016,23(1):136-140.
[6]寇淑清,张鹏,林宝君,等.中空装配式凸轮轴扩径联接强度影响因素分析[J].内燃机工程,2015,36(1):57-63.Kou S Q,Zhang P,Lin B J,et al.Analysis of influencing factors on assembled camshaft connection strength of tube expanding connection[J].Chinese Internal Combustion Engine Engineering,2015,36(1):57-63.
[7]雷力明,黄旭,段锐,等.具有应变硬化行为的弹塑性材料多道次等通道转角挤压有限元模拟[J].航空材料学报,2008,28(5):55-58.Lei L M,Huang X,Duan R,et al.Finite element simulation of multi-pass equal channel angular extrusion of elastic plastic material with strain hardening[J].Journal of Aeronautical Materials,2008,28(5):55-58
[8]乔健.装配式凸轮轴连接技术研究及数控装配机的研制[D].长春:吉林大学,2008.Qiao J.Development of NC Assembly Machine and Research on Connection Technology for Assembled Camshaft[D].Changchun:Jilin University,2008.
[9]王学生,王如竹,李培宁.复合管液压成形装置及残余接触压力预测[J].中国机械工程,2004,15(8):662-666.Wang X S,Wang R Z,Li P N.Estimation of residual contact pressures in CRA-lined pipe manfactured by hydroforming process[J].China Mechanical Engineering,2004,15(8):662-666
[10]王祖城,汪家才.弹性和塑性理论及有限单元法[M].北京:冶金工业出版社,1983.Wang Z C,Wang J C.Finite Element Method and Elastic and Plastic Theory[M].Beijing:Metallurgical Industry Press,1983.
[11]毕宗岳,王纯,晁利宁,等.L360QS/Incoloy825镍基合金液压复合管的有限元模拟与试验[J].塑性工程学报,2016,23(1):131-135.Bi Z Y,Wang C,Chao L N,et al.Finite element simulation and experimental study of L360QS/Incoloy825 nickel base alloy hydraulic pipe[J].Journal of Plasticity Engineering,2016,23(1):131-135.