Elucidation of Pattern Formation Phenomena Generated in Contact Rotating Systems

1.将无心磨削过程中工件多边形变形现象建模为一个包含磨削和摩擦的时滞线性系统，并进行了理论分析和数值计算。理论计算结果与实验结果进行了比较。结果表明，所提出的理论结果可以解释所有的实验结果.结果表明，无心磨削过程是非常不稳定的.实验上考虑了在由一片金属辊组成的辊系中产生的图案形成现象。在使用titan、SCM、SUS和S45 C作为卷材的实验中，根据易磨损材料、硬材料和软材料等材料特性，有选择地发生垂直和水平振动。观察了斑图现象的形成过程。研究结果对热矫直辊多边形磨损试验装置的研制具有重要的指导意义.实验 关于我们 对直流电动机产生的闪络现象进行了确认。然而，图案似乎长大，但在实验中途停止生长，因此尚未确认闪络。由于旋转体的固有频率对斑图的形成有明显的影响，因此我们又进行了一次基本的实验，并重新进行了分析。由于实验结果与理论结果在以下几点上存在分歧，因此将对直流电动机中产生的电力进行研究：（1）在实际电机中换向器上出现的四多边形图案在分析结果中并不明显。(2)分析结果不能解释实际机床中仅产生均匀多边形变形的现象.将造纸机多级递纸辊系统中产生的不稳定振动视为一种模式形成现象进行了分析，实验结果与分析结果吻合较好。由于更高的振动模式的图案形成是可接受的。对炼钢热矫直机轧辊多边形磨损进行了分析。首先，测量已经废弃的辊的形状。接下来，对实际热矫直机进行了振动测量。建立了轧辊多边形磨损的解析模型。近期将提出轧辊多边形磨损的延迟对策，并将继续进行详细分析。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