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

制备了四种陶瓷结合剂砂轮并进行了磨削试验。这些砂轮在相同的粒度和颗粒比（外径100 mm，内径90 mm，厚度5 mm）下，具有不同的粘结剂含量和孔隙率。在湿磨、雾磨、冷风磨和冷风雾磨条件下进行了磨削试验。使用磨削中心VKC-45进行端面磨削用于磨削试验。工件是退火的S500。磨料颗粒为PA。砂轮形状为杯形。SURFTEST EST-600用于测量在垂直于磨削划痕的方向上拾取的磨削表面粗糙度。利用扫描电镜观察了不同冷却方式下的磨削表面及产生的小切屑，得到了不同冷却方式下的磨削表面粗糙度。湿的、冷空气的雾和薄雾。在比较粗糙度，该值为4 μ m的Ry在冷空气磨削。这是因为冷空气没有润滑作用， 关于我们 由于磨削接触区大，冷空气的冷却作用不能降低摩擦热产生的磨削热。通过湿、雾、冷空气雾各模式的润滑，使磨削表面粗糙度小。在喷雾模式与冷气喷雾模式的比较中，表面粗糙度在喷雾模式下随着孔隙率的增加而变大，但在冷气喷雾模式下，这并不改变。这是因为冷空气具有冷却作用和通过容易流过的细孔去除切屑的作用。每个砂轮在20- 30欧姆/小时时获得最小粗糙度。在lmJhr时，由于燃烧和摩擦作用引起的振动，获得了较差的表面，摩擦作用是由少量的雾供应引起的。与冷却效应相比，润滑效应降低了摩擦热。在雾磨中，适度的雾量为20- 30 m3/hr。砂轮孔隙率为35 ~ 40vol%。阐明了雾模式的优越性。在冷雾模式下，冷风的吹送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