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二个相联结的零件,决定它们联结孔位置的尺寸公差,对于保证零件的互换性来说,是非常重要的。孔位置尺寸公差的决定应保证在制造过程中的经济性和合理的精度。孔间尺寸的公差是取决於二相联结零件的孔与联接件(如螺钉螺丝等)之间的间隙的大小。孔间距离的公差值在极大程度上是根据配合性质和工艺因素决定的,卽: (1)零件上的孔数和彼此的位置关系; (2)联结的特徵; (3)装配的精度; (4)孔的深度(影响到孔的偏斜); (5)孔间距离; (6)螺栓和螺钉的挠曲度; (7)通孔的直径; (8)孔中心所在之圆周的直径。後面五点,影响公差数值不大,可以忽略。联结零件的形式一般可以分为两种:A型——在这种型式中,軸(螺钉铆钉等)自由地通过两个
The two connected parts, determine the size of the location of the coupling hole tolerances, to ensure the interchangeability of the parts, it is very important. The determination of the dimensional tolerance of the hole location should ensure economy and reasonable accuracy in the manufacturing process. Tolerances for hole size depend on the size of the gap between the holes in the two-phase link and the couplings (eg, screw screws, etc.). Tolerances for the distance between the holes are to a large extent determined by the nature of the fit and the process factor, 卽: (1) the number of holes in the part and their positional relationship to each other; (2) the characteristics of the joint; (3) Accuracy; (4) Depth of hole (affects deflection of hole); (5) Distance between holes; (6) Flexibility of bolt and screw; (7) Diameter of through hole; The diameter of the circle. Behind the five points, the impact of numerical tolerance is small, can be ignored. The form of coupling parts can be generally divided into two types: Type A - In this type, the shaft (screw rivet, etc.) freely passes two