Cutting tool, gear machining device, repolishing method for cutting tool and method of designing cutting tool

摘要

To provide a gear-cutting tool capable of shortening a time required for re-grinding while improving the life of a tool by increasing the amount of re-grinding.SOLUTION: A tooth thickness of a first blade 111 of a first processing part 110 is equal in a tooth lead direction on the same diameter position, a tooth thickness of a second blade 121 of a second processing part 120 is equal toward the tooth lead direction on the same diameter position and has the same tooth thickness with a tooth thickness of the first blade 111 on the same diameter position, a tooth surface 123 of a second blade 121 forms a surface continuous to a tooth surface 113 of the first blade 111. A tooth thickness of a third blade 131 of a third processing part 130 is equal toward a tooth lead direction on the same diameter position and has a tooth thickness larger than the tooth thickness of the first blade 111 and the second blade 121 on the same diameter position, and the tooth surface 133 of the third blade 131 has a difference with respect to the tooth surface 123 of the second blade 121.SELECTED DRAWING: Figure 4