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高精度液压柔性冷拔工艺是一种新型的钢管冷加工工艺。利用Deform-3D有限元分析软件对液压柔性冷拔工艺中冷拔模具和钢管之间的受力状态进行数值模拟。对不同工艺参数条件下,钢管分别通过4个模具油槽时的应力、应变状态及变形规律进行模拟;分析了在柔性冷拔过程中钢管横截面壁厚增量及钢管纵截面壁厚延伸量的变化规律。采用优化后的工艺参数及改进后的模具结构,对20#无缝钢管进行高精度液压柔性冷拔工艺试验;试验成形的钢管减径效果明显,管坯直径由Φ30 mm×2 mm减至Φ26 mm×2 mm,实现了冷拔减径目标,钢管壁增厚量微小,平均增厚量为0.02 mm,表面成形质量良好,试验结果与模拟结果相符。
High-precision hydraulic flexible cold drawing process is a new type of steel cold working process. The finite element analysis software Deform-3D was used to simulate the stress state between the cold drawn die and the steel pipe in the hydraulic flexible cold drawing process. Under different process parameters, the stress, strain state and deformation of steel pipe through four mold oil tanks were simulated respectively. The increment of wall thickness of steel pipe cross section and the extension of wall thickness of longitudinal section of steel pipe during flexible cold drawing were analyzed The law of change. Using the optimized process parameters and the improved mold structure, the 20 # seamless steel pipe is subjected to high-precision hydraulic flexible cold drawing process test. The effect of reducing the diameter of the test-formed steel pipe is obvious. The diameter of the pipe is reduced from Φ30 mm × 2 mm to Φ26 mm × 2 mm, the target of cold drawing and reducing is achieved. The thickening of steel pipe wall is small with an average thickness of 0.02 mm. The surface forming quality is good, and the test results are consistent with the simulation results.