机械图纸中常见的符号及意义(中英文).docVIP

直-一个条件，一个面元素或轴是一条直线。Straightness - a condition where an element of a surface or an axis is a straight line. 平整度是条件，表面有所有的元素在一个平面。Flatness - is the condition of a surface having all elements in one plane.? ? 圆度-描述条件对革命的表面（圆柱，圆锥，球）在所有点的表面相交的任何飞机。Roundness - describes the condition on a surface of revolution (cylinder, cone, sphere) where all points of the surface intersected by any plane.?? ? 圆柱度-描述了一个条件的旋转面，使所有的点面距离相等，一个共同的旋转轴。Cylindricity - describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. ? 线轮廓-是条件允许量相同的剖面变化，醚单边或双边，沿着一条线元素的特征。Profile of a Line - is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, along a line element of a feature. ? 面轮廓-是条件允许量相同的剖面变化，醚单边或双边，上表面。Profile of a Surface - is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, on a surface. ? 周围标志-表明公差适用于所有周围的部分表面。All Around Symbol - indicating that a tolerance applies to surfaces all around the part ? 倾斜度-是表面，轴，或中线，这是从某一特定角度基准平面或轴。Angularity - is the condition of a surface, axis, or centerplane, which is at a specified angle from a datum plane or axis. ? 垂直度-条件是表面，轴，或线，这是90度的基准平面或基准轴Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis ? 平行度-一个表面，线，或轴，这是等距离的所有点，基准平面或轴。Parallelism - is the condition of a surface, line, or axis, which is equidistant at all points from a datum plane or axis. ? 位置公差-定义一个区域内的轴或中心平面的一个特点是允许不同的真正的（理论上精确）位置。Position Tolerance - defines a zone within which the axis or center plane of a feature is permitted to vary from true (theoretically exact) position.? ? 同心度-描述在其中一个条件的2个或更多的功能，在任何组合，有一个共同的旋转轴。Concentricity - describes a condition in which two or more features , in any combination, have a common axis.? ? 对称 -是一种状况，其中一个功能（或功能）是处理有关对称中心平面基准特征。Symmetry - is a condition in which a feature (or features) is symm