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1200薄板轧机机架广泛出现开裂,我公司的情况也不例外。力学分析结果表明,这种轧机机架在设计上存在一定问题,不能泛泛地用一般的操作因数、机架铸钢质量等来解释。一、机架的力学分析 1.关于水平力的确定 1200薄板轧机为单下辊传动,轧制力通过轧辊及其侧瓦对机架施加水平力,其大小可按图1确定。若不考虑轧辊轴瓦的摩擦,则轧件对轧辊的合压力通过上辊中心,与下辊中心相距a。为方便起见,将Q力移至下辊中心,这时Q力可由通过下辊中心的Q力及力偶Qa来代替。Qa即为无摩擦驱动下辊的力矩。由图1可得:
1200 plate rolling mill rack widespread cracking, my company’s situation is no exception. Mechanical analysis results show that there are some problems in the design of this kind of mill stand, which can not be generally explained by the general operation factors, the cast steel quality of the stand and so on. First, the mechanical analysis of the rack 1. On the determination of horizontal force 1200 sheet mill for a single roll drive, rolling force through the roll and its side tile on the frame to exert horizontal force, the size can be determined according to Figure 1. If you do not consider the friction of the roller bearing, the rolling pressure on the roll passes through the center of the upper roll and away from the center of the lower roll a. For convenience, the Q force is moved to the center of the lower roll where the Q force can be replaced by the Q force through the center of the lower roll and the couple Qa. Qa is the frictionless lower roller torque. Available from Figure 1: