【作者】 杨君；

【导师】 胡盛德；

【作者基本信息】 武汉科技大学 ， 材料科学与工程， 2016， 硕士

【摘要】 以HFW660焊管机组为研究对象,围绕直径为508mm的X60焊管的生产过程进行研究。首先,通过分析HFW660排辊成型机组的设备及工艺参数,建立焊接前HFW660机组排辊成型的有限元模型,对模拟结果进行了试验验证;接着建立焊接段焊接过程的有限元模型,得到整个排辊成型过程的仿真模型;最后对仿真计算结果进行了分析和探究。结果表明,在排辊成型过程中,带钢边部和底部的等效塑性应变最大,其中边部等效塑性应变大于底部的,此外边部和底部等效塑性应变增幅较大的是弯边辊处、线成型段第一内辊处和精成型段处,其余部分平滑上升。对焊前管型效果、边缘形态及V形角分析表明,精成型出来后管型效果良好,外观无明显缺陷产生,两边边缘近似呈现I型,是焊前较为理想的边缘形态,通过计算得到V形角大小大概在3.1o左右,属于合理范围;对焊接过程不同时刻的温度场进行分析,发现焊管表面热影响区随着热源的移动均匀地沿周向和轴向推动,并且靠近熔池区域的热影响区较宽,远离熔池的地方逐渐收窄,分析焊管上表面对应点的热循环曲线可知离焊缝2~5mm间属于过热区域,符合实际生产,对焊后冷却至11s时的等效应力进行探究发现,焊缝处厚度中心区域及过热区域应力较大,部分在375MPa左右,焊后去除残余应力时需重点关注。更多还原

【Abstract】 The study uses the forming process of Φ508mm X60 pipes manufactured by HFW660 cage roll forming mill as the object.Firstly,finite element models of HFW660 cage roll forming and high frequency welded pipe are established,then strip are simulated,after proving the correctness of the model,the simulation model of the process of welded pipe is constructed.finally,the simulation calculation results are analyzed and explored.From the analysis of result,In roll forming process,the equivalent plastic strain of the strip edge is larger than that of bottom,but both of them are larger than other parts,moreover,The equivalent plastic strain amplitude of edge bending,Lf1 and Fp are bigger than other parts of the strip.From the analysis of the pipe,edge shape and vee angle,it turns out that the exterior of pipe and the edge of the pipe before welding are good and the Vee angle is at about 3.1 deg,belong to the reasonable scope;To analyze the temperature field of welding process,the HAZ of welded pipe is moving uniformly along the circumference and axial direction relative to the heat force,and the HAZ near the molten pool is wider than the HAZ away from the molten pool in the welding process.To analyze the thermal cycle cure of the nodes on the external surface,it turns out that overheated area ranges from 2mm to 5mm,it is in line with the actual production.The welding line and the overheated area are in very high level of residual stress,some areas are about 375 MPa from the result of analysis,this two areas should be paid attention to when removing the residual stress after welding.更多还原