SCREW MILLING METHOD Russian patent published in 2007 - IPC B23C3/00 B23G1/32 

FIELD: manufacturing processes in machine engineering, working screws with circular helical surface having large pitch and small spacing between apex and recess for screw pumps.

SUBSTANCE: method comprises steps of imparting rotation to blank and to cutting tool also performing rectilinear feed motion along axis of worked blank. In order to enlarge manufacturing possibilities of method, peripheral surface of tool in the form of cylindrical milling cutter is used. Axis of spindle of milling cutter is inclined by inclination angle of helical line. Cylindrical milling cutter is mounted in oscillation head and it is provided with individual main-motion drive. Head with tool is subjected in addition to oscillation motion through kinematics links matched with blank rotation relative to oscillation axis normal to and passing through axis of tool in its crossing point with plane including axis of blank and perpendicular connecting axes of blank and tool at zero oscillation angle. Maximum value of oscillation angle is determined according to given formula.

EFFECT: enlarged manufacturing possibilities of method.

3 dwg