Method for modifying plunge shaving cutters

A method for modifying plunge shaving cutters through a gear forming grinder which includes a tool stand and a workpiece stand movable against the tool stand along a first axis, the tool stand including a machining spindle for driving a grinding tool to spin, the workpiece stand including a workpiece spindle rotating about the first axis, the method comprising the steps of:

• providing a plunge shaving cutter which includes a plurality of helical teeth spaced from each other;
• defining a machining-intended side of the helical teeth;
• positioning the plunge shaving cutter on the workpiece spindle to make the machining-intended side in contact with the grinding tool;
• and
• spinning the grinding tool and rotating the plunge shaving cutter about the first axis according to a variable rotation amount and moving the plunge shaving cutter along the first axis according to a first variable movement amount, and moving the grinding tool along a second axis perpendicular to the first axis and the machining spindle according to a second variable movement amount such that the grinding tool moves helically against the plunge shaving cutter to perform a modification process on the machining-intended side;
• wherein during the modification process a ratio of the variable rotation amount and the first variable movement amount is a first variable obtained through calculation of a tooth profile parameter of the plunge shaving cutter, and a ratio of the second variable movement amount and the first variable movement amount is a second variable obtained through calculation of the tooth profile parameter.