How to effectively utilize piston rods in daily production
1. In normal use, the piston rod is subjected to alternating loads, and the device rubs back and forth against its surface, so high hardness and wear resistance are required at this location.
2. The product structure is relatively simple, but the aspect ratio is large, belonging to the category of slender shaft components with poor rigidity. In order to ensure machining accuracy, rough and fine turning should be separated during turning, and both rough and fine turning should use a tool holder to reduce workpiece deformation during machining. A center frame should be used when machining threads at both ends.
3. When selecting the positioning reference, in order to ensure the coaxiality tolerance of the components and the mutual positional accuracy of each part, the machining process adopts two center hole positioning, which conforms to the principle of unified reference.
4. When grinding the surface of the outer circle, the workpiece is prone to deformation and elastic deformation, which affects the accuracy of the piston rod. Therefore, during processing, the center hole should be polished and kept clean. The tightness between it and the top should be appropriate, and good lubrication should be ensured. The general selection of grinding wheel: white corundum (WA) abrasive, particle size 60 #, medium soft or medium hardness, ceramic bonding agent. In addition, the width of the grinding wheel should be narrower to reduce radial grinding force. When processing, pay attention to the selection of grinding amount, especially the grinding depth should be small.
5. When grinding the outer circle and 1:20 taper, the two processes should be carried out separately. When grinding the 1:20 taper, the test piece should be ground first, and the workpiece can only be formally ground after the test piece is inspected and qualified.
6. In order to ensure the stability of the machining accuracy of the piston rod, manual straightening is not allowed throughout the entire machining process.