3 Conclusion <br> <br> no idea lathe machining head feed shaft parts is when surveying foreign imports machinery parts, according to its top surface of the part clamping prints and pinhole, after careful analysis, inspired by their research out of However, its fixture structure has not yet been clarified and needs further study. According to the analysis of workpiece impression, the workpiece end has a positioning center hole, and six radial tool indentations are distributed around it, which is similar to the general wood turning machine processing clamping, but the clamping fixture may be more complicated. Since there is no data introduction for the headless fixture, it can not be designed and manufactured for the time being. Therefore, the triangular and quadrangular pyramids are used instead of the clamping fixture. The effect is good, the process aim and the machining precision are achieved, and the triangular pyramid and the quadrangular pyramid are processed. Easy to manufacture, easy to install, improve work efficiency and save materials.
There is a problem that the radial component force is large when the cutting is strong, and sometimes the plastic deformation of the transmission pyramid and the contact point of the transmission hole is slightly loosened, so it is required to adjust the tightness of the thimble in time so that the transmission pyramid and the transmission hole can be eliminated in time. The slippage caused by the large radial cutting force ensures a reliable connection between the transmission pyramid and the part drive circular hole without any looseness. Therefore, the tailstock ejector must be equipped with a device for automatically adjusting the axial pressure so that When the transmission pyramid and the transmission circular hole contact point of the part are plastically deformed, the axial pressure of the ejector pin automatically presses the part against the transmission pyramid to eliminate the looseness caused by plastic deformation. The device includes a pressure mechanism and a control mechanism, specifically The structure is still considered mature, and it is time to continue research. At present, the manual urging and manual control methods are applied to the tailstock ejector pin to solve the plastic deformation and looseness caused by the cutting force.
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