In general, the requirements of precision shaft parts processing in the shaft can be divided into stepped shafts, tapered mandrels, optical shafts, hollow shafts, crankshafts, camshafts, eccentric shafts, a variety of screws and so on.
According to the function and working conditions of shaft parts, its design technology requirements are mainly in the following areas:
Shaft parts processing technology requirements
1. Dimensional accuracy
Shaft parts of the main surface is often two types: one type is with the inner ring of the bearing with the outer journal, that is, the bearing journal, used to determine the position of the shaft and support the shaft, the dimensional accuracy requirements are higher, usually IT 5 ~ IT7; the other type of journal with various types of transmission parts, that is, with the journal, the accuracy of a little lower, often for IT6 ~ IT9.
2. Geometric accuracy
It mainly refers to the roundness and cylindricity of the surface of the journal, external taper surface, taper hole and other important surfaces. The error should generally be limited to the size tolerance range, for precision shafts, need to be separately specified in the parts drawing of the geometric accuracy.
3. Mutual positional accuracy
Including internal and external surfaces, the important axis of the coaxial surface, the radial runout of the circle, the important end of the axis of the perpendicularity of the center line, the parallelism between the end face, etc.
4. Surface roughness
Shaft processing surface have roughness requirements, generally based on the possibility of processing and economy to determine. Support journal is often 0.2 ~ 1.6μm, transmission parts with the journal for 0.4 ~ 3.2μm.
5. Heat treatment, chamfering, chamfered and appearance modification requirements.
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