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应用有限元分析软件Deform-3D,对地质钻杆六方接头空心坯料的开式反挤压成形过程进行了数值模拟。研究了入模半角、入模口引导区长度、断面收缩率对挤压成形力及成形质量的影响。模拟结果显示:随着入模半角的增大和断面收缩率的增加都会使成形力显著提高;适当地增加入模口引导区长度,可避免刮料的产生。工艺试验表明,优化后的工艺参数能有效降低接头的挤压成形力,提高成形质量。
The finite element analysis software Deform-3D was used to simulate the open-form extrusion process of the hollow billet of the hexagonal joint of geological drill pipe. The effects of half-angle of entry, length of lead-in area, and reduction of area on extrusion forming force and forming quality were studied. The simulation results show that the forming force increases significantly with the increase of the half-angle of the mold and the reduction of the area shrinkage rate. The length of the guiding zone of the die inlet can be increased properly to avoid the scraping. Technological tests show that the optimized process parameters can effectively reduce the extrusion forming force and improve the forming quality.