锻压技术

石油钻杆管端加厚分步镦锻成形工艺研究

英文标题：Study on multi-pass forming process for end upsetting of oil drill pipe

单位：上海工程技术大学

分类号：T376

出版年,卷(期):页码：2014,39(12):10-13

摘要：

石油钻杆端部在加厚的过程中，钻杆内表面易发生折叠或屈皱，在交变载荷作用下易形成疲劳裂纹源，导致刺漏的发生。针对Ф101.6 mm×8.38 mm规格的石油钻杆，利用Deform-3D软件分别对石油钻杆内外加厚方式的镦锻过程进行模拟并优化最佳锻件的工艺尺寸，用以获得较好表面质量的锻件，并进行成形试验验证。研究结果表明，在石油钻杆内外加厚过程中，第1工步控制凸模行程可以避免出现凹陷现象；第2工步通过增加凸模行程可以将凹模过渡面引起的内表面凸起隐藏在内表面过渡起始处；将Ф101.6 mm×8.38 mm石油钻杆端部加厚工艺的第1工步行程设为105 mm，第2工步凸模行程设为83.27 mm时，能够得到表面质量较好的锻件。

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.

基金项目：

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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