METHOD FOR ROLLING TOOTH PROFILE OF SPUR GEAR BY WORKING WHILE RELIEVING RESIDUAL STRAIN

摘要

PURPOSE:To eliminate defect owing to a residual strain by heating the required part of a blank material for a spur gear to a specific temp., working axially the material by a boat-shaped tool and generating a tooth profile while relieving the residual strain. CONSTITUTION:A blank material 2 for a spur gear is heated from the outside circumference at the end face thereof toward the central part by a heater 1 and the material 2 is moved in an arrow 8 direction then the end face on the outside circumferential surface of the material 2 bites into the bow part of a boat- shaped tool 3. When the number of teeth is indexed and a switch of a motor is turned on, the tool 3 and the material 2 rotate. When the working ends, the temp. of the material 2 decreases during the working and therefore the material 2 is moved while the material is heated further by the heater 1 in an arrow 8' direction. The material 2 is removed from a center 5. Since stress remains in the material 2 on decreasing of the temp. during the working, the material is again heated to 600-650 deg.C and is removed from the machine. The material is placed as it is in a prescribed position and is released after the temp. of the material is restored to an ordinary temp.