一表面精度的重要性机械零件的質量,過去取决於三個項目,即:金相的,物理的,及尺寸的。近年來,表面精度(Surface roughness)漸為製造業所注意,成為第四个而且是最重要的因素。兩個零件雖然在金相組織上和負荷能力上相同,而且經過相同的工作程序,達到相同的規定尺寸,但是因其表面精度的不同,可能在使用效率及耐久性上發生頗大差異。例如軸承的工作溫度及耐久性,便與表面光滑情形發生密切關係;如果不經精密加工,就會因突出的高點(High spot)引起局部高壓,破壞油層,造成金屬相觸,温度升高,磨损加速,終至發生“咬死” The Importance of a Surface Accuracy The quality of a mechanical part used to depend on three items: metallographic, physical, and dimensional. In recent years, the surface roughness gradually became the fourth and most important factor in the manufacturing industry. Although the two parts are the same in metallographic structure and load capacity and achieve the same specified dimensions through the same working procedure, the differences in surface accuracy may cause considerable differences in efficiency and durability. For example, the working temperature and durability of the bearings are closely related to the smooth surface; if not precision machining, high pressure will be caused by the local high pressure (High spot), damage the oil layer, causing the metal contact, temperature rise , Accelerated wear and tear, and finally to “kill”