几何形状位置公差中英对照6-17.doc

半径和控制半径 半径 半径是从圆心到圆弧或圆的表面的一条直线。半径的符号是R。符号R使用时，就产生了由两条圆弧（最小半径和最大半径）定义的公差带。 零件表面必需位于公差带内。 控制半径 控制半径是不准许平直和相反的半径。控制半径的符号为CR。当CR使用时，就产生了由两条圆弧（最小半径和最大半径）定义的公差带。 零件表面位于新月型的公差带内，并且不是平直和相反圆弧。 6 Radius and Controlled Radius Radius A radius is a straight line extending from the center to the surface of an arc or a circle. The symbol for a radius is “R”. When the “R” symbol is used, it create a zone defined by two arcs(the minimum and maximum radii). The part surface must lie within this zone. Controlled Radius A controlled radius is a radius with no flats of reversals allowed. The symbol for controlled radius is “CR”. When the “CR” symbol is used, it creates a tolerance zone defined by two arcs (the minimum and maximum radii). The part surface must be within the crescent-shaped tolerance zone and be an arc without flats or reversals. 6 统计公差符号 统计公差符号表示被应用的尺寸公差是由统计方法建立的.。当这个符号用在图纸上时，零件形体用统计制程管制进行生产。该符号用注记标在后面，如下图所示： 形体定义为统计公差时，生产时用统计制程管制。 统计公差符号适用于尺寸公差或一个形位公差控制的公差值。 7 Statistical Tolerancing Symbol The statistical tolerancing symbol denotes that the dimension of tolerancing to which it is applied was established by statistical methods. When this symbol is used on a drawing, the part feature should be manufactured using statistical process controls. The symbol is accompanied by a note as shown in the example below. FEATURES IDENTIFIED AS STATISTICALLY TOLERANCED SHALL BE PRODUCED WITH STATISTICAL PROCESS CONTROLS. The statistical tolerance symbol may be applied to a dimensional tolerance or to the tolerance value of a geometric control. 7 形体控制框 形体控制框包括： 控制特性（几何特性） 公差带尺寸 公差带修正表示： 公差带形状 (). 直径 () 符号表示圆柱公差带。 球径 () 符号表示球形公差带 公差应用以下条件 () 选用参考基准和参考基准修正 参考基准修正 8Feature Control Frame The feature control frame consists of: Type of control (geometric characteristic) Tolerance zone size. Tolerance zone modifiers denote: The tolerance zone shape (). The diameter () symbol denotes a cylindrical tolerance zone. The spherical diameter () symbol denotes a spherical t