大型钛合金双层板超塑成形/扩散连接工艺仿真
|
摘要
选取大型TC4钛合金双层板工件为研究对象,采用超塑成形/扩散连接工艺成形。通过材料基础性能实验获得板料和模具材料在不同温度下的比热容、导热系数和热膨胀系数等;通过成形过程的热力耦合有限元数值模拟,得到板料贴模效果、厚度分布、温度场变化和热收缩后尺寸结果,并进行实验验证。结果表明:成形后工件壁厚分布均匀,成形凹槽部位的板厚减薄率最大达到15%,降温过程中的温度变化和热收缩引起最终的尺寸变化,并明确了模具长度方向的缩放系数应为6‰~7‰,对这种窄长工件的实际生产具有重要的参考价值。
Two- layer sheets structure of TC4 titanium alloy were researched. The sheets were formed by superplastic forming / diffusion bonding( SPF / DB) process. The specific heat,heat conduction coefficient and thermal expansion coefficient of the sheet and die material were obtained with the tests of blank forming property. The forming result,thickness distribution,temperature variation,constriction size after conducting heat were studied by finite element numerical simulation of heat force coupling,then use superplastic forming test to verify it. The results show that the thickness of the sheet metal distributes uniformity,the thinnest position in the notch reaches 15%,the temperature variation and the heat constriction arouse size variation during cooling down,and the expansion coefficient of the die in length is 6~ 7 in a thousand,so it has reference value to the narrow and long part in actual manufacture.
Two- layer sheets structure of TC4 titanium alloy were researched. The sheets were formed by superplastic forming / diffusion bonding( SPF / DB) process. The specific heat,heat conduction coefficient and thermal expansion coefficient of the sheet and die material were obtained with the tests of blank forming property. The forming result,thickness distribution,temperature variation,constriction size after conducting heat were studied by finite element numerical simulation of heat force coupling,then use superplastic forming test to verify it. The results show that the thickness of the sheet metal distributes uniformity,the thinnest position in the notch reaches 15%,the temperature variation and the heat constriction arouse size variation during cooling down,and the expansion coefficient of the die in length is 6~ 7 in a thousand,so it has reference value to the narrow and long part in actual manufacture.
引文
[1]文九巴,杨蕴林,杨永顺,等.超塑性应用技术[M].北京:机械工业出版社,2005.
[2]王国峰,张凯锋.快速超塑性的研究与应用[J].塑性工程学报,2010,17(6):55-61.
[3]Yan H H,Zhang K F.Processing of multi-sheet structures of an aluminum alloy by laser welding/superplastic forming[J].Materials and Design,2010,31:2220-2223.
[4]于维新,李淼泉.材料超塑性和超塑成型/扩散连接技术及应用[J].材料导报,2009,23(6):8-12.
[5]韩文波,张凯峰,王国峰.Ti-6Al-4V合金多层板结构的超塑成形/扩散连接工艺研究[J].航空材料学报,2005,25(6):29-32.
[6]Zhao Bing,Li Zhiqiang,Hou Hongliang,et al.Three dimensional FEM simulation of titanium hollow blade forming process[J].Rare Metal Materials and Engineering,2010,39(6):0963-0968.
[7]王高潮,梁军辉,谢崴,等.高温拉伸试验机超塑性拉伸误差分析[J].热加工工艺,2013,42(8):59-62.
[8]崔元杰.TC4多层板结构超塑成形/扩散连接工艺数值模拟与试验研究[D].南京:南京航空航天大学,2007.
[9]Bonet J,Gil A,Wood R D,et a1.Simulating superplastic forming[J].Computer Methods in Applied Mechanics and Engineering,2006,195:6580-6603.
[10]卢万云,谢兰生,王荣华.TC4钛合金夹层结构激光焊接芯板超塑成形[J].热加工工艺,2010,39(9):105-107.
[11]黄钢华,张益华,门向南,等.钛合金超塑成形/扩散连接的数值模拟及工艺研究[J].稀有金属与硬质合金,2009,37(3):16-20.
[2]王国峰,张凯锋.快速超塑性的研究与应用[J].塑性工程学报,2010,17(6):55-61.
[3]Yan H H,Zhang K F.Processing of multi-sheet structures of an aluminum alloy by laser welding/superplastic forming[J].Materials and Design,2010,31:2220-2223.
[4]于维新,李淼泉.材料超塑性和超塑成型/扩散连接技术及应用[J].材料导报,2009,23(6):8-12.
[5]韩文波,张凯峰,王国峰.Ti-6Al-4V合金多层板结构的超塑成形/扩散连接工艺研究[J].航空材料学报,2005,25(6):29-32.
[6]Zhao Bing,Li Zhiqiang,Hou Hongliang,et al.Three dimensional FEM simulation of titanium hollow blade forming process[J].Rare Metal Materials and Engineering,2010,39(6):0963-0968.
[7]王高潮,梁军辉,谢崴,等.高温拉伸试验机超塑性拉伸误差分析[J].热加工工艺,2013,42(8):59-62.
[8]崔元杰.TC4多层板结构超塑成形/扩散连接工艺数值模拟与试验研究[D].南京:南京航空航天大学,2007.
[9]Bonet J,Gil A,Wood R D,et a1.Simulating superplastic forming[J].Computer Methods in Applied Mechanics and Engineering,2006,195:6580-6603.
[10]卢万云,谢兰生,王荣华.TC4钛合金夹层结构激光焊接芯板超塑成形[J].热加工工艺,2010,39(9):105-107.
[11]黄钢华,张益华,门向南,等.钛合金超塑成形/扩散连接的数值模拟及工艺研究[J].稀有金属与硬质合金,2009,37(3):16-20.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |