US 12,226,860 B2
Method for manufacturing sintered gear
Kazunari Shimauchi, Osaka (JP); Tomoyuki Ueno, Osaka (JP); Tomoyuki Ishimine, Osaka (JP); and Munehiro Noda, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC SINTERED ALLOW, LTD., Takahashi (JP)
Appl. No. 17/608,504
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP); and Sumitomo Electric Sintered Alloy, Ltd., Takahashi (JP)
PCT Filed Apr. 28, 2020, PCT No. PCT/JP2020/018196
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2020/226111, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 2019-088650 (JP), filed on May 8, 2019.
Prior Publication US 2022/0226944 A1, Jul. 21, 2022
Int. Cl. B23P 15/14 (2006.01); B22F 3/16 (2006.01); B22F 5/08 (2006.01); B23F 9/08 (2006.01); B23F 21/16 (2006.01); C22C 38/04 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01)
CPC B23P 15/14 (2013.01) [B22F 3/16 (2013.01); B22F 5/08 (2013.01); B23F 9/082 (2013.01); B23F 21/16 (2013.01); C22C 38/04 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); B22F 2301/35 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for manufacturing a sintered gear comprising the steps of:
preparing a cylindrical green compact;
gear-cutting the green compact with a hob; and
sintering the gear-hobbed green compact to form the sintered gear,
wherein the hob is such that a ratio of a number of cutting edges thereof per round to a number of starts thereof exceeds 8, and
wherein in the step of gear-cutting, within a particular cycle, a feed rate of the hob at a first end face of the green compact corresponding to a process starting side is slower than a feed rate of the hob at a second end face of the green compact corresponding to a process ending side.