Quality issues that are prone to occur in the powerful cutting of multi head worm gears in precision parts processing

The main reason for the phenomenon of tool binding during precision parts machining is that the workpiece is not firmly clamped and moves, resulting in an increase in cutting volume. In addition, the poor elasticity of the turning tool shank, too large selection of cutting parameters, too large longitudinal rake angle of worm turning tool, improper selection of cutting fluid, or work hardening due to blunt cutting edge of turning tool, which affects cutting, may also cause tool binding. Once cutting occurs, it can cause damage to the turning tool or scrapped workpiece, while it can cause damage to the machine tool. Therefore, efforts should be made to prevent it.

Incorrect tooth shape is mainly caused by the grinding and installation of turning tools in precision parts processing. For example, the sharp corners of the cutting tool have not been corrected; Unequal height between the turning tool tip and the workpiece center; The bisector of the blade tip is not perpendicular to the axis of the workpiece; Failure to install the tool correctly according to the worm form during precision turning, etc. In addition, the wear of the turning tool can also affect the correctness of the tooth shape.

Vibration caused by poor surface quality and insufficient rigidity of the tool holder; Dull or damaged turning tools; Poor rigidity of the workpiece and improper selection of cutting parameters; The borrowing amount during rough machining is too large to be corrected; Insufficient margin in the finishing stage; Improper selection of cutting fluid; The appearance of chip buildup or chip roughening on the side of worm teeth during turning will result in a decrease in surface quality.