Seamless steel pipe precision requirements

(A) Seamless steel pipe size accuracy
In order to determine the position of the shaft, it is usually required for its dimensional accuracy (IT5 ~ IT7). The accuracy of the journal size of the assembly drive is generally low (IT6 ~ IT9).

(B) Seamless steel pipe geometry accuracy
The geometric shape accuracy of the shaft parts refers mainly to the roundness, the cylindrical degree, etc. of the journal, outer cone, Mohs cone, etc., and should be limited to the tolerance range. 40Cr seamless steel pipe with high accuracy requirements of the inner and outer circular surface, the drawings should be marked on the allowable deviation.

(C) Seamless steel pipe position accuracy
The positional accuracy requirements of the shaft parts are determined primarily by the position and function of the shaft in the machine. It is usually necessary to ensure that the journal of the drive body is required to coax the support journal, otherwise it will affect the transmission accuracy of the transmission (gear, etc.) and produce noise. The axis of normal accuracy, the radial runout of the support shaft with respect to the support journal is generally 0.01 to 0.03 mm, and the high precision shaft (e.g., the main shaft) is usually 0.001 to 0.005 mm.

(D) Seamless steel pipe surface roughness
In general, the surface roughness of the shaft diameter is Ra2.5 ~ 0.63μm, and the surface roughness of the supporting shaft diameter is 40.63 ~ 0.16μm with the 40Cr seamless steel tube bearing.