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Technical requirements for machining of shaft parts

December 16, 2022

Today we speak from three aspects.

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First: dimensional accuracy, journal is the main surface of shaft parts, which affects the rotary accuracy and working condition of the shaft. The diameter accuracy of the journal is usually IT6 to 9 according to its use requirements, and the precision journal can reach IT5.

 

Second: geometric shape accuracy, the geometric shape accuracy of the journal (roundness, cylindricity), generally should be limited to the diameter tolerance point range. When the geometric shape accuracy requirements are high, the allowable tolerances can be separately specified in the parts diagram.

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Third: the location of the processing, accuracy mainly refers to the assembly of transmission parts with the journal relative to the assembly of the bearing support journal coaxiality, is with the journal of the support journal radial circular runout to express; according to the use of requirements, the provisions of high precision shaft 0.001 ~ 0.005mm, and general accuracy shaft 0.01 ~ 0.03mm. In addition there is the coaxiality of the inner cylindrical surface and axial positioning end face And axis perpendicularity requirements.

 

Fourth: surface roughness, according to the parts of the surface work parts, can have different surface roughness values, such as ordinary machine tool spindle bearing journal surface roughness of Ra0.16 ~ 0.63um, with the journal surface roughness of Ra0.632.5um, with the increase in machine speed and precision degree of improvement, shaft parts surface roughness value requirements will become smaller and smaller .