環境対応型研削加工における有気孔ホイール/砥石の気孔有用性の理論的・実験的解明

制作了四个玻璃化结合剂砂轮并进行了磨削试验。在晶粒尺寸和晶粒比不变（外径100mm，内径90mm，厚度5mm）的情况下，这些砂轮具有可变的粘结剂含量和孔隙率。进行了湿式、雾式、冷气式和冷气雾式四种模式下的磨削试验。采用VKC-45型磨削中心进行磨削试验。工件为退火后的S500。磨粒为PA。砂轮形状为杯形砂轮。SURFTEST -600用于测量与磨削划痕垂直方向的地面表面粗糙度。利用扫描电镜观察了不同冷却方式下的磨削表面和小切屑。的冷却模式下得到了表面粗糙度。湿、冷空气雾和雾。在比较粗糙度时，冷风磨削的值为4 p m。这是因为冷空气没有润滑作用，而且由于磨削接触面积大，冷空气的冷却作用再大也不能减少摩擦热产生的磨削热。湿式、雾式和冷气雾式各润滑方式下，表面粗糙度均较小。与冷空气雾型相比，雾型表面粗糙度随着孔隙率的增加而增大，而冷空气雾型表面粗糙度则没有变化。这是因为冷空气容易通过气孔，具有冷却效果和去除碎屑的作用。每个车轮的最小粗糙度为20-3OmIIhr。由于薄雾供应少而引起的燃烧和摩擦作用引起的振动，在lmJIhr处获得了较差的表面。结果表明，与冷却效果相比，润滑效果降低了摩擦热。在雾磨中，雾的适度体积为20-30m]Ihr。砂轮的孔隙率为35% ~ 40%。阐明了雾模式的优越性。在冷气雾模式下，冷气的吹制方式对砂轮的磨削性能有影响。少

The four vitrified-bonded grinding wheels were fabricated and used in grinding tests. These wheels have the variable bond contents and pore ratios under the constant grain size and grain ratios (100mm in out diameter, 90mm in inner diameter and 5mm in thickness). We carried out the grinding tests under the conditions of wet, mist, cool air and cool-air mist modes. Face grinding was used for grinding test using a grinding center VKC-45. The workpiece is an annealed S500. The abrasive grain is PA. The shape of grinding wheel is cup-typed one. SURFTEST EST-600 was used to measure the ground surface roughness that was picked up in perpendicular direction to grinding scratch. SEM was used to observe ground surface and small chips produced in various cooling modes.The ground surface roughness was obtained in cooling modes of. wet, cool-air mist and mist. In comparing roughness, the value was 4 p m in Ry in cool-air grinding. This is because cool air does not have lubrication effect, and the … More cooling effect of cool air could not decrease the grinding heat that was produced by the friction heat due to the large contact zone of grinding. The ground surface roughness is small by the lubrication in each mode of wet, mist and cool-air mist. In comparing mist mode with cool-air mist mode, the surface roughness is large by the increase of pore rates in mist mode, but in cool-air mist mode, that does not change. This is because cool air has a role of cooling effect and the remove effect of chips by the easy flow through pores. The minimum roughness is obtained at 20-3OmIIhr in every wheel. The worse surface is obtained at lmJIhr due to burning and vibration by friction action that is caused by the small supply of mist. lit was cleared that the friction heat decreased by lubrication effect compared with cooling effect. In mist grinding, the, moderate volume of mist is 20-30m]Ihr. The pore rates of grinding wheel are 35 to 4Ovol%. The superiority of mist mode is clarified. In cool-air mist mode, the blowing method of cool air influences to the grinding performance of grinding wheel. Less