摘要 |
The present invention relates to a broach capable of sufficiently increasing the machining accuracy of cutting. A plurality of cutting edges (3) that are arranged on an outer circumference of a shaft-shaped broach body (2) are provided with a spline teeth group (7), which contains a plurality of spline teeth (8) that groove a prepared hole of a work material, and a round teeth group (9), which is disposed in a different position from the spline teeth group (7) along an axis direction (O) and contains a plurality of round teeth (10) that machine an inner circumference of the prepared hole. At least one gullet (12) is formed to extend along the outer circumference of the broach body (2) in a circumferential direction around the axis between the round teeth that are adjacent to one another in the axis direction (O) in the round teeth group (9). The gullet (12) extends toward the axis direction (O), gradually twisting toward the circumferential direction. The spline teeth group (7) and the round teeth group (9) are formed integrally on the outer circumference of the broach body (2). |