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针对嵌套热挤压工艺生产的冶金结合双金属复合管坯在冷轧过程中发生层间撕裂缺陷的问题,对缺陷产生的机理进行了理论分析,结果发现,当结合界面剪应力值大于界面结合强度时冷轧过程中就会发生层间撕裂缺陷。推导了复合管冷轧过程中界面剪应力的计算公式,即可通过计算内外层管的轴向应力差得到。以304L/20G为例进行了理论计算,并用ABAQUS有限元软件分别模拟内外层单金属管坯的冷轧过程,得出界面剪应力值,模拟结果、理论计算和生产实际基本一致,说明本文提出的计算界面剪应力的方法可行。最后,基于分析提出了避免缺陷产生的工艺改进措施。
According to the problem of interlayer tearing defects during the cold rolling of the metallurgical bonded bimetallic composite tube produced by the nested hot extrusion process, the mechanism of the defect is theoretically analyzed. The results show that when the combined interface shear stress is larger than Interlaminar tear defects occur during the cold-rolling process at the interface bond strength. The formula for calculating the interfacial shear stress in the process of cold rolling of composite pipe is derived, which can be obtained by calculating the axial stress difference between the inner and outer pipe. Taking 304L / 20G as an example, the theoretical calculation is carried out. The cold rolling process of the inner and outer single metal tubes is simulated by ABAQUS software. The interfacial shear stress values are obtained. The simulation results are basically consistent with the theoretical calculation and production practice. The method of calculating interface shear stress is feasible. Finally, based on the analysis proposed to avoid defects in process improvement measures.