Elucidation of Pattern Formation Phenomena Generated in Contact Rotating Systems

1.将无心磨削加工过程中的多边形变形现象建模为具有磨削和摩擦时滞的线性系统，并对其进行了理论分析和数值计算。将理论计算结果与通常的实验结果进行了比较。结果表明，给出的理论结果可以解释所有的实验结果。显然，无心磨削工艺是非常不稳定的。实验上考虑了由一块金属轧辊组成的轧辊系统中产生的图案形成现象。在以TITAN、SCM、SUS和S45C为轧辊材料的实验中，根据材料特性，如易磨损材料、硬质材料和软质材料，有选择地发生垂直和水平振动。观察了花纹现象的生长过程。研究结果为热矫直机轧辊多边形磨损试验台的研制提供了重要依据。The Experim…进一步证实了直流电机产生的闪络现象。然而，这种模式似乎已经长大，但在一次实验中途停止了增长，因此闪络还没有得到证实。我们再次进行了基础实验，并重新开始了分析，因为已经明确了旋转体的固有频率对图案形成的影响。由于在以下几点上实验结果与理论结果不一致，因此将对直流电机产生的电动力进行分析：(1)实际电机换向器上出现的四个多边形图案在分析结果中没有明显产生。(2)分析结果不能解释实际加工中仅产生均匀多边形变形的现象。将造纸机多级压延辊系统产生的不稳定振动视为一种花纹形成现象进行了分析，实验结果与分析结果吻合较好。振型越高，形成的花纹越明显。对炼钢机热矫直机轧辊的多边形磨损进行了分析。首先，测量了已经废弃的卷子的形状。接下来，对实际的热矫直机进行了振动测试。在此基础上，建立了轧辊多边形磨损的分析模型。在不久的将来，将提出轧辊多边形磨损的延迟对策，并将继续进行详细的分析。较少

1. The polygonal deformation phenomena of a workpiece in centerless grinding process were modeled as a linear system with time lag accompanied by grinding and friction, and were analyzed theoretically and computed numerically. The theoretical results were compared with the usual experimental results. As a results, the presented theoretical results can explain all the experimental ones. It was made clear that the centerless grinding process was very unstable.2. Pattern formation phenomena generated in a roll system consisting of a piece of metal rolls were experimentally taken into account. In the experiments using titan, SCM, SUS, and S45C as roll material, the vertical and horizontal vibrations occurred selectively according to the material characteristics like materials easy to wear, hard and soft materials. The process in which the pattern phenomena grew up were observed. The results do a major service to setting of an apparatus for polygonal wear of hot leveler rolls.3. The experim … More ent to confirm the flashover phenomena generated in DC motor was performed. However, the pattern seems to grow up, but the growth stops during an experiment halfway, so the flashover is not yet confirmed. Basic experiments were performed once more, and we started the analysis all over again, since it was made clear that the natural frequencies of rotating body have effects upon the pattern formation. Since disagreement between experimental and theoretical results was found on the following points, the electric force generated in DC motor will be examined : (1) Four polygonal pattern which occurs on the commutator in the actual machine is not remarkably generated in the analytical results. (2) Generation of only even polygonal deformation in actual machine can not be explained by the analysis.4. Regarding the unstable vibration generated in the multi-stage calender roll system of paper making machine as a pattern formation phenomena, the analysis was performed and a good agreement between experimental and analytical results was confirmed. Pattern formations due to higher vibration modes are remarkable.5. The polygonal wear of rolls in hot leveler of steel making machine was analyzed. First, the shape of rolls disused already was measured. Next, the vibration measurement of the actual hot leveler was performed. Then an analytical model for polygonal wear of rolls was presented. Delay countermeasure of polygonal wear of rolls will be proposed in the near future, and the detail analysis will be continued. Less