(1) size accuracy

The role of supporting shaft neck in order to determine the position of the shaft, usually the size higher accuracy (IT5 ~ IT7). Assembly train parts shaft neck size accuracy general requirement low (IT6 ~ IT9).

(2) the surface roughness

The role of supporting shaft neck in order to determine the position of the shaft, usually the size higher accuracy (IT5 ~ IT7). Assembly train parts shaft neck size accuracy general requirement low (IT6 ~ IT9).

(3) mutual position precision

Shaft parts position precision requirements are the main shaft in the position of the mechanical function and decision. Usually should guarantee the shaft assembly transmission parts of supporting shaft

neck of the coaxial tolerance of requirements, otherwise, it will affect the transmission parts (gear, etc) transmission precision, and noise. Ordinary precision of the shaft, with its axis paragraph of supporting shaft neck of radial beat general for 0.01 ~ 0.03 mm, high precision axis (such as spindle) are generally 0.001 ~ 0.005 mm.

General and drive a match the trunnion surface roughness as Ra2.5 ~ 0.63 u m, combined with bearing of supporting the surface roughness of the Ra0.63 trunnion for ~ 0.16 u m.

(4) geometric shape accuracy

Axial parts geometry precision is mainly refers to shaft neck, the cone, the hole and cone's roundness, cylindrical degree and so on, should be generally will limit its tolerance in dimension tolerance range. For higher accuracy of inside and outside round surface, should be in drawing mark the allowable deviation.

Axial parts may use requirements, production types, equipment conditions and structure, choose good material, forging and blank form. For the circle diameter of the little difference from shaft, general with good material for the Lord; And for the circle diameter of differ big ladder shaft or important shaft, often choose forgings, such already save materials and reduce the workload of mechanical processing, still can improve mechanical properties.

 
According to the scale of production of different, blank forging a way to have a free forging and die forging two kinds. Medium and small batch production used more free forging, a large number of mass production is used when die forging.
 



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