Thin shaft machining tool, small precision parts machining center

Thin shaft machining method
Due to the poor stiffness of slender shafts, they are prone to deformation during the machining process, which has a significant impact on the machining accuracy and quality of precision parts. Therefore, the following measures are usually taken to solve this problem.

（1） Improve the clamping method of workpieces
In rough machining, due to the large cutting allowance and the high cutting force on the workpiece, the card top method is generally used, and the tailstock top adopts an elastic top to allow the workpiece to extend freely in the axial direction. However, due to the limitation of the top elasticity, the axial extension is also restricted, so the top force is not very large. It is dangerous to remove the workpiece from the top during high-speed cutting and large-scale cutting. The Kara method can avoid this phenomenon.
In precision turning, using the double top point method (in which case the tailstock should use an elastic center) is beneficial for improving accuracy, and the key is to improve the accuracy of the center hole.

（2） Using a knife holder
The tool holder is an extremely important component for turning slender shafts. The use of a tool holder can counteract the influence of radial cutting force during machining, thereby reducing cutting vibration and workpiece deformation,
But careful adjustment must be made to ensure that the center of the tool holder is aligned with the center of the machine tool tip.

（3） Adopting reverse feed
When turning the slender shaft, the turning tool tends to move towards the tailstock (Carla tool should be installed at this time), so that the feed force exerted by the tool on the workpiece is oriented to the tailstock and the workpiece tends to extend axially. Carla cutting tools greatly reduce bending deformation caused by workpiece elongation.

（4） Using a lathe tool for turning slender shafts
Slender axis turning tools generally have larger rake and rake angles, resulting in lighter cutting and reduced radial vibration and bending deformation. The rough cutting tool has a chip breaking groove on the front cutting surface, making the chips easy to break. The knives used on small cars often have a certain negative inclination angle, causing chips to flow onto the surface being processed.