When turning slender shafts in the field of precision parts machining, the rigidity of the workpiece itself is poor, and if the center stand, the follow tool holder and other auxiliary tools are not properly adjusted, the geometry and surface quality will not meet the requirements, thus leading to bending.
The workpiece has a large diameter and poor rigidity; the radial cutting force and centrifugal force during turning, the workpiece produces thermal deformation elongation and cutting stress; the blank material itself is a deformed rod and other reasons, which can cause the workpiece to bend.
The solution is to use the center frame, follow the tool holder, increase the rigidity of the workpiece; reasonable selection of the geometric angle of the tool (mainly large front angle, large main deviation angle), reduce the radial cutting force, reduce the generation of cutting heat; the use of spring top, reduce the adverse effects of the workpiece line expansion, fully pour cutting fluid, reduce friction and quickly take away the heat generated, the necessary heat treatment of the blank or workpiece.
In the process of precision parts processing if the blank material itself or processing bending, should be timely straightening before continuing turning. Specifically according to the need to choose hot forging straightening, cold pressing correction, counterstrike method correction, counterstrike method straightening, pry hit straightening, simple tool straightening, quenching straightening, anti-torsional groove straightening and other appropriate methods.