Shaft parts processing, technical accuracy requirement

Shaft is one of the common typical parts in mechanical processing. It is mainly used for supporting in mechanical gears, pulleys, CAM and connecting rod drive parts, such as to transfer torque. Is different, the form of the structure of shaft can be divided into axial, taper spindle, optical axis, hollow shaft, crankshaft, camshaft, eccentric shaft, all kinds of screw, such as wide application of ladder shaft, its processing method can comprehensively reflect the shaft parts processing regularity and commonality. According to the function of the shaft parts and working conditions, the main technical requirements in the following aspects: 1 dimensional accuracy of the surface of the main shaft parts are often two kinds: one kind is cooperate with the inner ring of the bearing of the cylindrical shaft neck, namely the supporting shaft neck, used to determine the position of the shaft and supporting shaft, high dimension accuracy requirement, usually for IT 5 ~ IT7; Another kind of journal to cooperate with all kinds of transmission parts, namely the coordinate axis neck, its precision is a bit low, often is IT6 ~ IT9. 2 geometry accuracy refers to the surface of the journal, conical surface, the surface of the cone hole, and other important roundness and cylindricity. Its error generally should be limited within the scope of the size tolerance, for precision shaft, need on the part drawing shall be separately stipulated the geometry accuracy. 3 mutual position accuracy include interior and exterior, important on the surface of the shaft alignment, round radial runout and end face important axis of verticality and parallelism between the end face, etc. Surface roughness of 4 axis machining surface roughness requirement, generally determine according to the possibility of processing and economy. Supporting shaft neck often is 0. 2 to 1. 6 microns, drive a shaft neck of 0. 4 to 3. 2μm。 Five other heat treatment, chamfering, chamfering and exteriors and other requirements.