摘要
基于上限法理论对厚壁无缝钢管推挤缩径成形过程进行了理论解析,推导了缩径变形极限载荷的解析式。分析了影响缩径挤压载荷的工艺参数,确定摩擦系数是实际生产过程中影响挤压载荷的关键可调参数。根据所推导的理论,以某型130 kN半挂车桥壳体产品为研究对象,结合钢管材料在温、热条件下的本构方程,通过MATLAB对缩径挤压载荷随温度和摩擦系数的变化情况进行了可视化处理。基于有限元软件DEFORM-3D对无缝钢管变温挤压缩径过程进行了数值模拟,并在液压设备上进行了轴头热挤压工艺试验,对缩径挤压载荷的上限解、数值模拟和工艺试验关于缩径挤压的载荷值进行了比较研究。结果表明,在其它工艺参数确定的情况下,缩径挤压载荷随摩擦系数的增大而升高,且载荷增加的梯度亦逐渐增加;高温条件下,无缝钢管端部变形区由于锻前受热程度不同导致的局部性能差异对缩径挤压成形载荷的影响不大。缩径挤压载荷的上限解数值略大于数值模拟和工艺试验的成形载荷,验证了缩径挤压成形载荷解析式的准确性。
Based on the theory of upper bound method,the theoretical analysis of the necking forming process of thick wall seamless steel tube in pushing-extrusion process was carried out,and the analytical formula of the limit load of necking deformation was derived.The process parameters affecting the necking extrusion load were analyzed.It is confirmed that the friction coefficient is the key adjustable parameter that affects the extrusion load in the actual production process.According to the deduced theory,a 130 kN semitrailer axle housing product was taken as the research object and the changing situation of the necking extrusion load with the temperature and friction coefficient was visualized by MATLAB combined with the constitutive equation of the steel tube material under warm and heat conditions.Based on the finite element software DEFORM-3D,the numerical simulation of the extrusion necking process of seamless steel tube with variable temperatures was carried out,and the hot extrusion experiment for forming shaft heads was carried out on the hydraulic equipment.The comparative study of upper limit solution,numerical simulation and process experiment of the necking extrusion load was carried out.The results show that the necking extrusion load increases with the increase of friction coefficient,and the increasing gradient of the load increases gradually under the condition that other process parameters are determined.Under high temperature condition,the difference of local properties in the end deformation zone of seamless steel tube due to the different heating degree before forging has little effect on that of the necking extrusion forming load.The upper limit solution value of the necking extrusion load is slightly larger than the forming load of numerical simulation and process experiment,which verifies the accuracy of the analytical formula of the necking extrusion forming load.
作者
李攀
罗建国
陈彬
王续明
赵文利
LI Pan;LUO Jian-guo;CHEN Bin;WANG Xu-ming;ZHAO Wen-li(College of Mechanical and Electrical Engineering,North China Institute of Science and Technology,Langfang 065201,China;Hebei Key Laboratory of Safety Monitoring of Mining Equipment,North China Institute of Science and Technology,Langfang 065201,China;Capital Aerospace Machinery Co.,Ltd.,Beijing 100076,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第6期30-37,共8页
Journal of Plasticity Engineering
基金
中央高校基本科研业务经费资助项目(3142018012,3142018006,3142019055)
河北省自然科学基金资助项目(E2019508105)
廊坊市科学技术研究与发展计划自筹经费资助项目(2018011039,2018011040)。
关键词
半挂车桥壳体轴头
热挤压
上限法
数值模拟
shaft head of semitrailer axle housing
hot extrusion
upper bound method
numerical simulation
