公差与配合符号

INCLUDEPICTURE "http://www.tec-ease.com/images/Straightness.gif" \* MERGEFORMAT Straightness直线度 - a

Straightness 直线度 -a condition where an element of asurface or an axis is astraight line. Flatness -is the condition of asurface having all elements in one 平面度 plane. Roundness -describes the condition on asurface of revolution 圆度 (cylinder, cone, sphere) where all points of the surface intersected by any plane. Cylindricity 圆柱度 -describes acondition of asurface of revolution in which all points of asurface are equidistant from acommon axis. Profile of aLine 线轮廓度 -is the condition permitting auniform amount of profile variation, ether unilaterally or bilaterally, along aline element of a feature. Profile of aSurface -is the condition permitting auniform 面轮廓度 amount of profile variation, ether unilaterally or bilaterally, on asurface. All Around Symbol 全周符号 -indicating that atolerance applies to surfaces all around the part. Angularity -is the condition of asurface, axis, or centerplane, 倾斜度 which is at aspecified angle from adatum plane or axis. Perpendicularity -is the condition of asurface, axis, or line, which 垂直度 is 90 deg. From adatum plane or adatum axis. Parallelism -is the condition of asurface, line, or axis, which is 平行度 equidistant at all points from adatum plane or axis. Position Tolerance 位置度 -defines azone within which the axis or center plane of afeature is permitted to vary from true (theoretically exact) position. Concentricity 同轴度 -describes acondition in which two or more features ,in any combination, have acommon axis. Symmetry -is acondition in which afeature (or features) is 对称度 symmetrically disposed about the center plane of adatum feature.