Perfect Countermeasure against Pattern Formation Phenomena Generated in Contact Rotating Systems

本文研究了利用动态吸振器解决炼钢机热矫直机工作辊多边形磨损的对策，提出了动态吸振器的优化设计方法。在实际辊板接触刚度较软的情况下，两个动态减振器都能很好地抑制多边形磨损现象。制作了一套由一对接触旋转辊和一个动态吸收器组成的单自由度图案形成系统实验装置。根据无动力吸收体的实验结果，证实了系统固有频率、多边形数和转速之间的关系与分析结果定性一致。根据阻尼动力吸收器的实验结果，证实了图案形成的延迟效应。实验结果与分析结果吻合较好。此外，还证实了动态吸收器的阻尼对于延迟图案形成现象是必要的。其次，讨论了利用动态吸光器防止卷绕机上图案形成现象的对策。由于缠绕片的粘弹性特性，在操作中有时会出现缠绕片的图案形成现象。图案形成现象会对薄膜造成致命的损伤。利用实验装置进行了花纹形成实验，并对考虑轧辊弹性变形的花纹形成现象进行了理论分析，阐明了花纹形成的机理。他们还从理论上探讨了通过附加动态吸收剂来抑制这种现象的对策。理论分析证实了可调动态吸波器的有效性。对BTA深孔切削过程中的花纹形成现象即膛线痕迹进行了实验和分析处理。结果表明，优化设计的BTA具有最优的切削刃与导轨夹角，且不会产生膛线痕迹。少

This investigation deals with a countermeasure by using dynamic absorbers for polygonal wear of work rolls in a hot leveler of steel making machine and proposes the optimal design method of dynamic absorbers. In the case of the actual machine in which the contact rigidity between rolls and plate is comparatively soft, it was shown that the polygonal wear phenomena were all perfectly suppressed by two dynamic absorbers. An experimental equipment of a single degree-of-freedom pattern formation system with a pair of contact rotating rolls and a dynamic absorber are made. According to the results of the experiments without dynamic absorber, it is confirmed that the relation among the natural frequency of the system, the polygonal number and the rotating speed agree with the analytical results qualitatively. According to the results of the experiments using a damped dynamic absorber, the delaying effect of pattern formation is confirmed. Also, a good quantitative agreement between the exper … More imental and analytical results is confirmed. Moreover, it is confirmed that damping of a dynamic absorber is necessary to delay pattern formation phenomena.Next we deals with a countermeasure against pattern formation phenomena generated on film winder using dynamic absorbers. Pattern formation phenomena of the wound sheet sometimes occur in operation because of the viscoelastic characteristics of the film. The pattern formation phenomena lead to a fatal damage on the film. We conducted experiment to generate the pattern formation using experimental apparatus, and theoretically analyzed to clarify the mechanism of the pattern formation phenomena considering the elastic deformation of the rolls. They also theoretically examined the countermeasure to suppress the phenomena by attaching some dynamic absorbers. The effectiveness of the tunable dynamic absorbers was confirmed by the theoretical analysis.The pattern formation phenomena, namely, rifling marks in the BTA deep hole cutting process were treated experimentally and analytically. It was shown that the optimal angles among cutting edge and guides exited and the rifling marks were not generated for the optimally designed BTA. Less