Transactions of Materials and Heat Treatment

Title：Study on multi-pass forming process for end upsetting of oil drill pipe

Authors： Zhao Wangchu Xu Xincheng Yang Xiangdong Yan Binbin Tian Jiao Zhao Ziyi

Unit： Shanghai University of Engineering Science

KeyWords： oil drill pipe fold end upsetting finite element simulation

ClassificationCode：T376

year,vol(issue):pagenumber：2014,39(12):10-13

Abstract：

During the end upsetting process of oil drill pipe, fold or wrinkle appeares easily on its inner surface and the resource of fatigue crack formes easily under alternating stresses, as a result, piercing happenes at last. For a Ф101.6 mm×8.38 mm drill pipe, the internal-external end upsetting process of oil drill pipe was simulated by Deform-3D software. The optimum process parameters were obtained to get a better surface quality and verified by relevant experiments. The simulation results show that in the first step, depression defects can be avoided by controlling punch movement; and in the second step, by adding the punch movement, the bulges caused by the transition surface of the die can be hidden at the beginning on the inner surface transition. The optimum process parameters of Ф101.6 mm×8.38 mm drill pipe end upsetting are that the punch movement is 105 mm in the first step and 83 mm in the second step, so that a better surface quality can be obtained.

Funds：

上海市宝山区科学技术委员会产学研合作项目（CXY-2012-19）；上海工程技术大学研究生科研创新资助项目（E1-0903-14-01126）

赵旺初(1990-),男,硕士研究生;通讯作者：徐新成(1959-），男，学士，教授

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