When selecting the positioning datum, in order to make the coaxiality tolerance of the parts and the mutual position accuracy of each part, all the processing procedures adopt two center holes for positioning, which conforms to the principle of unified datum. When grinding the outer surface of the precision piston rod, the workpiece is prone to slippage and elastic deformation, which affects the precision of the piston rod.
Therefore, the hole should be repaired and kept clean during processing, the tightness between the hole and the top should be appropriate, and there should be good lubrication. The general choice of grinding wheel: abrasive white corundum, particle size, hardness, medium soft or medium, ceramic bond, and the width of the grinding wheel should be narrower to reduce the radial grinding force, pay attention to the selection of grinding amount during processing, and the grinding depth should be small .
When grinding φ outer circle and taper, the two processes should be carried out separately. When grinding the taper, the test piece must be ground first, and the workpiece can be formally ground only after the test piece is qualified.
The inspection of the conical surface is carried out with standard
In order to ensure the stability of precision piston rod machining accuracy, manual alignment is not allowed during the whole process of machining. During nitriding treatment, threaded parts, etc., should be protected with protective devices. The precision piston rod is in the form of reciprocating motion. In order to increase the life of the piston rod and reduce the wear of the piston rod, the blank is made of 38CrMoAlA alloy structural steel.
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