![]() Peng WF, Yu WJ, Jiao SJ, Shu XD, Shu BS, Liu YZ, Zhan LH (2014) Analysis of cross wedge rolling of spiral shaft parts. American Society of Mechanical Engineers, In, pp 819–820 Morrow CA, Lovell MR, Li Q (2005) Determination of a critical forming parameter for the cross-wedge rolling of tubes. Wang FJ, Shuang YH, Hu JH, Wang QH, Sun JC (2014) Explorative study of tandem skew rolling process for producing seamless steel tubes. Zhu XH, Ji W (2017) Finite element analysis and experimental study on roll-forming method in iso-wall thickness stator bushing of screw drilling. Zhu XH, Shi CS, Tong H (2015) Optimizing loading path and die linetype of large length-to-diameter ratio metal stator screw lining hydroforming. Wang XY, Qi ZM, Jin JS (2015) Design of die for even-thickness helical tube by incremental forming. Mechanical Engineering & Automation 3(1):17–19 Wang K, Guo MX, Sun XW (2013) Finite element analysis of rolling forming of uniform wall thickness PDM’s stator pipes. Li M, Zhang M (2006) Study on the process techniques of uniform wall thick PDM. Qiu YL, Yang DS, Han CJ, Zheng HL, He M (2008) Designs for broach on spiral groove of stator of uniform wall thick PDM. The research results have important engineering significance for improving the processing quality of the spiral tube and improving the working performance of the positive displacement motor. The results show that when the pipe outer diameter is 56 mm, the pipe wall thickness is 5 mm, the rolling depth is 3.3 mm, the forming speed is less than 15 mm/s, the hot forming is adopted, the arc radius of the 304 stainless steel rolling surface is 6.3 mm, and the radius of the arc of the 20G rolling surface is 7.1 mm, so the formed spiral tube is of good quality. The forming of 5LZ54 spiral tube was studied by finite element method, and the influence of forming speed, rolling surface arcs the radius, forming temperature, rolling depth, and friction coefficient on the processing of spiral tube was analyzed. ![]() The results verify that the numerical simulation method can accurately analyze the forming result of the spiral tube. The forming analysis of the 5LZ73 spiral tube was simulated by finite element method and compared with the experimental results. ![]() According to the indoor processing experiment of 5LZ73 spiral tube and tensile test of material, the finite element model of multi-roller rotary feed forming spiral tube was established. This paper uses multi-roller rotary feed forming process to process spiral tube with uniform wall thickness. In order to solve the problem of short life of conventional positive displacement motor and the inner spiral surface of stator with equal wall thickness is difficult to process. Some foreign manufacturers believe that perforation of the rotating bite on the tube has a certain self-aligning effect.The positive displacement motor is one of the most widely used downhole power drill in drilling operations. However, over the past decade or so, with the improvement of technology and equipment, fewer and fewer units are equipped with heat-set centers. At the same time, a good centering hole size can be obtained because the shape of the punch matches the shape of the tip nose. This method is highly efficient, has no metal consumption, is simple in equipment and has a wide range of applications. Heat centering is in the tube heating, with compressed air or hydraulic punching in the hot state, the device is set at the piercing machine at the front desk. The purpose of centering is to facilitate the perforation of the nose nose aligned tube axis to prevent the bud when the perforation biased to reduce the uneven thickness of the front end of the capillary while improving the oblique rolling fL bite bite conditions so wear fL process Smooth progress. Therefore, the pressure before the hole extrusion, ingot or billet to be shaped cross-piercing, round billet to be centering. In order to ensure that the wall thickness of steel pipe is uniform, the center axis of the tube must be punched.
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