变通道转角挤压成形钼丝的有限元模拟研究
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摘要
为了确定变通道转角挤压钼丝的工艺特征场的变量分布,通过有限元模拟和试验开展了以直径10 mm钼丝挤出直径6 mm钼丝的研究。试验验证了挤出过程中挤压力随行程的变化规律。分析了挤压速度对变形工件速度场的影响规律;分析了温度和等效应变的分布规律。结果表明:有限元模拟时最大挤压力的误差为9.20%;在通道转角处存在有梯度的增速区域和金属流动死区;通道转角区域的温度升高约100℃;挤出钼丝横截面上等效应变分布不均匀,刚性端的等效应变较小,其余部分上半区域的等效应变小于下半部分。
In order to confirm the parameter distribution of processing characteristic field for molybdenum wire extruded by unequal-channel angular pressing technique, finite element simulation and experiment were carried out to study the extrusion from a molybdenum wire with diameter of 10 mm to the another one with diameter of 6 mm. The variation rule of extrusion force with the stroke during extrusion process was verified by experiment. The influence of extrusion speed on the velocity field of deformed workpiece was analyzed. The distributions of temperature and equivalent strain were analyzed. The results show that the error of maximum extrusion force is 9.20% in finite element simulation. There are gradient growth zones and dead zones of metal flow existing at the corner of the channel. The maximum rise of temperature is about 100 ℃ in the channel corner region. The equivalent strain is not uniformly distributed in the cross section of the extruded molybdenum wire. The equivalent strain is smaller at the rigid end. In the rest area, the equivalent strain in the upper half part is smaller than that in the lower half part.
In order to confirm the parameter distribution of processing characteristic field for molybdenum wire extruded by unequal-channel angular pressing technique, finite element simulation and experiment were carried out to study the extrusion from a molybdenum wire with diameter of 10 mm to the another one with diameter of 6 mm. The variation rule of extrusion force with the stroke during extrusion process was verified by experiment. The influence of extrusion speed on the velocity field of deformed workpiece was analyzed. The distributions of temperature and equivalent strain were analyzed. The results show that the error of maximum extrusion force is 9.20% in finite element simulation. There are gradient growth zones and dead zones of metal flow existing at the corner of the channel. The maximum rise of temperature is about 100 ℃ in the channel corner region. The equivalent strain is not uniformly distributed in the cross section of the extruded molybdenum wire. The equivalent strain is smaller at the rigid end. In the rest area, the equivalent strain in the upper half part is smaller than that in the lower half part.
引文
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[2]刘先德.灯用钼箔防氧化设计[J].中国照明电器,2015(10):29-32.
[3]张菊平,付小俊.杂质元素对钼丝力学性能和显微组织的影响[J].中国钼业,2015,39(2):53-56.
[4]张润芳,刘德宝,李华,等.等通道转角挤压对生物MgZn-Ca合金显微组织与腐蚀行为的影响[J].稀有金属材料与工程,2018,47(9):2833-2839.
[5]陈泽中,程志龙,李雪源,等.工艺参数对铝合金微齿轮热挤压成形的影响[J].有色金属材料与工程,2018,39(2):12-17.
[6]郭廷彪,李琦,王晨,等.低温等通道转角挤压中定向凝固纯铜的组织及性能演变[J].材料导报,2018,32(10):1650-1654.
[7]杨宝成,韩富银,马盈,等.等通道转角挤压ZAM63-1Si镁合金的组织和性能[J].轻合金加工技术,2018,46(4):34-38.
[8]王晓溪,张翔,黄传辉,等.等通道球形转角膨胀挤压工业纯铝的组织与性能[J].稀有金属材料与工程,2018,47(6):1901-1905.
[9]赵军,李奋强,许铖斌,等.基于数值模拟的TA1等温等通道角挤压变形行为与试验研究[J].塑性工程学报,2017,24(6):55-60.
[10]章震威,王军丽,张清龙,等.等通道转角挤压制备超细晶材料的研究与发展[J].材料导报,2017,31(1):116-125.
[11]强华,徐尊平.挤压及热处理对6063铝合金组织及性能的影响[J].现代机械,2017(1):77-79.
[12]高雷雷,张金中,沙磊,等.摩擦应力在等通道转角挤压过程中的变化特性[J].塑性工程学报,2016,23(5):14-22.
[13]刘满平,韦江涛,李毅超,等.等通道转角挤压Al-MgSi铝合金的动态时效特性和力学性能[J].材料研究学报,2016,30(10):721-730.
[14]黄姝珂,李敬民,孟玉堂,等.基于等通道转角挤压的V-5Cr-5Ti合金晶粒细化机理[J].稀有金属材料与工程,2016,45(9):2313-2316.
[15]吴海优,韩永,杜强强,等.ZAM84-4Si等通道转角挤压组织与性能的研究[J].中国铸造装备与技术,2016(4):28-30.
[16]党利.Inconel 625合金大型厚壁管挤压变形宏微观规律研究[D].西安:西北工业大学,2016.
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