Method of manufacturing sintered gear

A method of manufacturing a sintered gear, the method comprising:

• preparing a green compact having two gear-shaped end surfaces, one on each of two sides in an axial direction of the green compact, and having a plurality of teeth on an outer peripheral surface formed between the two end surfaces;
• chamfering an edge of the teeth by a brush, the edge being constituted by the end surfaces and the outer peripheral surface;
• and
• sintering the green compact that has been chamfered,
• wherein powder constituting the green compact includes first mixed powder constituted by iron powder and nonferrous element powder, second mixed powder constituted by iron-based alloyed powder and nonferrous element powder, or iron-based alloyed powder,
• wherein the edge includes all of a tooth bottom edge, a tooth surface edge, and tooth tip edge,
• wherein the brush is a wheel-type brush including a disk-shaped wheel and a bristle member radially protruding from an outer periphery of the wheel,
• wherein a width of the bristle member in an axial direction of the wheel is larger than an interval between the teeth adjacent to each other,
• wherein the chamfering includes
• disposing the brush with respect to the green compact such that the axial direction of the green compact and the axial direction of the wheel intersect with each other,
• bringing a tip of the bristle member into contact with the tooth bottom edge constituted by the end surfaces of the green compact and a tooth bottom surface of the teeth at the outer peripheral surface, and
• relatively moving the brush in a circumferential direction of the green compact while rotating the brush, and
• wherein, in the chamfering, an amount of cutting in a radial direction of the green compact by the brush is 0.3 mm to 2 mm, an amount of cutting in the axial direction of the green compact by the brush is 0.3 mm to 2 mm, and a rotation speed of the brush is 200 m/min to 800 m/min.