Machining Method of Motor Shaft

Time:2019-07-02 20:53:50    Hits:6

High quality carbon structural steels, such as 35, 45 and 50, are widely used because of their high comprehensive mechanical properties, of which 45 steel is the most widely used.


In order to improve its mechanical properties, it is necessary to normalize or temper it. Carbon structural steels, such as Q235 and Q275, can be used for shafts which are not important or have less stress.


2. Alloy steel


Alloy steel has high mechanical properties, but its price is more expensive. It is mostly used for axles with special requirements.


For example, high-speed axles with sliding bearings, commonly used low-carbon alloy structural steels such as 20Cr and 20CrMnTi, can improve the wear resistance of journal after carburizing and quenching.


The rotor shaft of turbogenerator must have good high temperature mechanical properties when working under high temperature, high speed and heavy load conditions. 40CrNi, 38CrMoAlA and other alloy structural steels are often used.


Forging is the priority of axle blank, followed by round steel.


Cast steel or ductile iron can be considered for larger size or complex structure.


For example, making crankshaft and camshaft with ductile iron has the advantages of low cost, good vibration absorption, low sensitivity to stress concentration and good strength.


The mechanical model of axes is that beams and most of them rotate, so their stress is usually symmetrical cycle.


The possible failure modes are fatigue fracture, overload fracture and excessive elastic deformation.


Usually some parts with wheel hub are installed on the axle, so most axles should be made into stepped axles, and the cutting amount is large.

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