The shaft sleeve parts are made of 45 steel.

 

Blank selection: According to the parts material is 45 steel, the production type is medium batch production, the parts diameter and size difference is large, the parts wall is thin, the stiffness is low, the deformation is easy, the machining accuracy is high, the parts need quenching treatment and other factors, the choice between bar material and die forging, die forging.

 

For reference analysis, the main positioning reference should be φ20.5 inner hole center

 

Installation scheme, processing the big end and the inner hole, can be directly used three jaw chuck clamping; Rough processing small end can be used to clamp the big end, half fine, finishing small end, should be matched with a mandrel, with φ 20.5 hole positioning axial clamping workpiece.

 

Type hole processing, can use the indexing head installation, the spindle up 90º, and the use of direct indexing method, to ensure 3× φ6 in the circumference of the parts of the equal position. On the big end of the four screws through the hole is the use of special fixture installation: with big end face and φ 20.5 hole as the main positioning reference, type hole to prevent turning, the workpiece axial clamping.

 

Parts surface processing method, φ20.5 inner hole, using fine grinding to achieve precision and roughness requirements; The outer circle and its step surface are processed by grinding; The rest of the rotary surface with semi-precision car to meet the processing requirements; The hole is in the end mill.

 

Heat treatment arrangement, because the surface of the die forging has a hard skin, will accelerate tool wear and passivation, in order to improve the machinability, the blank after die forging annealing treatment, softening the hard skin; The final treatment of the parts is quenching. Because the wall thickness of the parts is small, it is easy to deform, and the machining accuracy of the parts is high, in order to control the quenching deformation as far as possible, tempering and tempering treatment is arranged for pretreatment after rough machining of the parts.