1. The structure of the chrome-plated rod is relatively simple, but the ratio of length to diameter is large. It is a slender shaft part and has poor rigidity. Tool holder, in order to reduce the deformation of the workpiece during processing, the intermediate holder should be used when processing both threads.
2. When selecting the positioning datum, in order to ensure the coaxiality of the parts and the mutual position accuracy of each one-sided, all the processing procedures adopt two middle hole positioning, which conforms to the same criterion of datum.
3. When grinding the outer surface, the workpiece is prone to knife and elastic deformation, which affects the accuracy of the piston rod . Therefore, the middle hole should be repaired during processing, and the middle hole should be clean, the tightness between the middle hole and the apex should be appropriate, and good lubrication should be guaranteed. Common choice of grinding wheel: abrasive white corundum (WA), grain size 60#, medium-soft or medium-hardness, and ceramic bond. In addition, the width of the grinding wheel should be narrower to reduce the radial grinding force. Pay attention to the choice of grinding quantity during processing. Especially the grinding depth should be small.
4. When grinding the outer circle and the 1:20 taper, the two processes must be carried out separately. When grinding the 1:20 taper, the test piece must be ground first, and the workpiece can be formally ground after the test piece is qualified.
5. In order to ensure the stability of the processing accuracy of the chrome-plated rod, manual straightening is not allowed in the whole process of processing.
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