(1) Blank selection: according to the material of parts is 45 steel, the production type is medium batch production, the diameter and size difference of parts is large, the wall of parts is thin, the rigidity is low, the deformation is easy, the processing accuracy is high, the parts need to be quenched and other factors, the choice between bar stock and die forging is made: die forging.
(2) Datum analysis: the main positioning datum should be Φ 20.5 bore Center
(3) Installation scheme: when machining big end and inner hole, three jaw chuck can be directly used for clamping; The small end of rough machining can be clamped with reverse claw, while the small end of semi finish machining and finish machining should be equipped with spindle to ensure the accuracy Φ 20.5 hole positioning, axial clamping workpiece. When machining the hole, the dividing head can be used to install and lift the spindle up 90 degrees. The direct division method is used to ensure 3 ×Φ 6 equal position on the circumference of the part. The big end of the four screw holes are installed with a special fixture: with the big end and Φ 5 hole as the main positioning reference, the hole anti rotation, axial clamping workpiece.
(4) Part surface processing method: Φ 20.5 inner hole, fine grinding to meet the requirements of accuracy and roughness; The outer circle and its step surface are grinded; The other rotary surfaces are semi finished to meet the processing requirements; The hole is on the end mill.
(5) Heat treatment arrangement: because there is a hard skin on the surface of the die forging, it will accelerate the tool wear and passivation. In order to improve the machinability, the blank is annealed after die forging to soften the hard skin; The final treatment of the parts is quenching. Due to the small wall thickness and easy deformation of the parts, as well as the high machining accuracy requirements of the parts, in order to control the quenching deformation as much as possible, the quenching and tempering treatment is arranged for the pretreatment after the rough machining of the parts. You can search online wococarbide. Wococarbide Provide various products and technical questions and answers.
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