抄録
The degradation of tooth surfaces and the unusual tool wear sometimes occurs in dry nobbing. This paper investigates the transient phenomenon of chip generations and behavior in hobbing by using high-speed video camera. The location of the ending point of cut on a cutting edge influences chip movements at the take-off from the tooth flank. Many chips rotate around the fulcrum of the ending point of cut. Some chips produced with the regular cutting tooth flow to the opposite side frequently when the ending point of cut exists at the trailing side in the conventional hobbing. When the chips flow to the opposite side flank, the chips strike against the tooth surface. There is possibility of jamming into the space between tooth surface and cutter relief surface. Two jamming patterns are found in the fundamental tests; (1) the chip attached on the cutting edge before one revolution is jammed into the space between work and cutting edge when it pushed by the new chip, (2) the end portion of chip newly produced is jammed during cutting.
