Simulation Of Rolling Deformation Of27SiMn Hydraulic Support Tube

27SiMn hydraulic support tube can be used to produce important seamless steel tubes,such as hydraulic support, automobile crane’s hydraulic cylinder and piston for mining. Thispaper explores the deformation rules of piecing and rolling of tubes, and the feasibility of27SiMn seamless steel tube (114×10) with certain plant’s bacterium-style puncher of Asseltube roller unit (Φ100) as the research object and the Simufact nonlinear finite elementsoftware as tool, based on the rolling process of Assel tube roller. This study lays theoreticalfoundation for optimization of Assel rolling process.3D FEM model for the bacteria-type piercing deformation process is established forsimulation of variation rules of workpiece piercing process; the stress strain curve of27SiMnsteel is determined by thermal simulation machine Gleeble-1500D, and the simulation resultsshow that the feed angle is10°, the tube blank can move in spiral manner in the metal cavityformed by the roll and guiding plate, and its velocity is about710.373mm/s; the maximumequivalent stress (103.676MPa) of tube’s external surface occurs in the area bridging tubeblank and the roll and guiding plate, and that (102.3MPa) of the tube’s inner surface occurs inthe area bridging the tube blank and the head tip; with the increase of feed angle from9°,10°to11°, the rolling force, the axial force of head tip and the lateral pressure on guiding plateincrease, the deviation of wall thickness and outer diameter also increases, but the externaldiameter ovality decreases.3D FEM model of steel tube’s rolling deformation is established to simulate the changesof tube rolling process, and the results indicate that the maximum equivalent stress of tube’sexternal surface (130.14MPa) and its inner surface (128.4MPa) occurs in the wall-decliningarea and reeling area. In the whole rolling process, the distribution of equivalent stress alwayschanges periodically, and the equivalent stress between adjacent rollers always declines fromthe roller bottom (i.e. the area between roller and capillary) to roll gap, then slightly increases,then decreases, and finally reaches its maximum in next roller bottom; the maximum value is 129.177MPa, and the minimum value is93.36MPa. With the increase of feed angle from4°,5°to6°, the rolling force and the outer diameter deviation increase, the deviation of wallthickness and the outer diameter ovality decrease.The results of simulation and calculation of piercing and rolling process demonstrate that,feed angle for5°is preferred in piercing process for better tubular billet, and feed angle for10°is preferred in rolling process for better steel tube, and the rolled steel tube’s size precisionslightly varies within the size tolerance. Therefore, the finite element simulation method caneffectively analyze the deformation rules of27SiMn steel pipe in rolling process. Thequantitative description of27SiMn steel tube’s deformation in piercing and rolling process laystheoretical foundation for reasonable optimization of27SiMn steel pipe production process andreal practice.