KEY GROOVES MAKING METHOD Russian patent published in 2004 - IPC

FIELD: machine engineering, possibly manufacture of key grooves on outer and inner surfaces of machine parts.

SUBSTANCE: method comprises step of forming key groove and further strengthening of part by electrically heating it; performing working by means of two tool-electrodes on lateral inner surfaces of groove for providing effect of quenching of actuating surfaces; acting by means of first tool-electrode upon one side of groove surface; acting by means of second tool-electrode upon other side of surface while preventing action upon zone of stress concentrators near groove base.

EFFECT: enhanced quality of key grooves due to providing effect of quenching actuating surfaces by means of electric contact process.

1 dwg