几何形状位置公差中英对照74-76.doc

表面皮纹定义 表面缺陷 生产中产品表面出现的非人为的表面不完美，如裂痕，气孔，突起，擦伤，沟槽，划痕，切伤，刺痕，凹窝，化学腐蚀等 纹理 刀具加工后在产品表面形成的纹路的主要方向。 微米 百万分之一米（0.000001米） 粗糙度 由于刀刃切削产生的相对微小距离的表面不规则 轮廓高度 在取样长度内产品表面峰与谷之间用微米表示的一个平均值 微观不平度宽度 用毫米表示的的有纹理的一段连续区域或微观峰与峰之间的距离 取样长度 为了测量表面粗糙度而取的一段长度，用毫米表示 表面特性 因为表面纹理而产生的连续的或者随机的误差（偏差）。包括粗糙度，表面微观不平度，纹理，缺陷。 微观平度 微观最高峰，可能是因为机器或者产品偏转产生的。 微观高度 峰与谷的距离，单位mm 微观宽度 相邻峰与峰或谷与谷之间的距离，单位mm 74Surface Texture Definitions Flaws Unintended surface imperfections which occur during manufacturing such as cracks, blow holes, rivets, scratches, gouges, nicks, cuts, punctures, dimples, chemical corrosion, etc. Lay The predominant direction of the toolmarks of the surface pattern. Micrometer One millionth of a meter, (.000005 meter) Roughness The relatively finely spaced surface irregularities that are produced by the cutting action of tool edges. Roughness Height A value in micrometers for the (arithmetical) average height between the peaks and valleys of the surface roughness of a typical “roughness width cutoff” length. Roughness Width The distance between successive areas of ridges which constitute the predominant pattern of roughness. Roughness width is measured in millimeters. Roughness Width Cutoff Rating The length of the surface measured for a roughness height check. Roughness width cutoff rating is usually measured in millimeters. Surface Texture The repetitive of random deviations from the nominal surface, which form the pattern of the surface. Included are Roughness, Waviness, Lay and Flaws. Waviness The surface undulations that are of much greater magnitude than roughness irregularities. Waviness may result form machine of part deflections. Waviness Height The peak to valley distance of the waves. It is measured in millimeters. Waviness Width The spacing of successive wave valleys or wave peaks. Waviness width is measured in millimeters. 表面特性符号 符号解释符号解释基本符号 有其他要求时的符号有加工要求 不准去除材料表面特性 粗糙度参照平均值 (Ra)um uinum uin0.025 1 0