Sintered material, sizing device, and method for manufacturing sintered material
AssigneeSumitomo Electric Sintered Alloy, Ltd.
InventorsJunpei Hara, Seiji Sakamoto
Life of this patent
Estimating the term…
Abstract
A cylindrical sintered material made of metal, in which one of an inner peripheral surface and an outer peripheral surface of the sintered material includes: a plurality of helical teeth arranged in parallel along a circumferential direction of the sintered material; and a sizing mark provided on at least a part of a tooth bottom surface, a tooth surface, and a tooth tip surface of each of the helical teeth, the helical tooth has a tooth profile error less than or equal to 6 μm, and the helical tooth has a tooth trace error less than or equal to 27 μm.
Claims6
A sizing device that corrects a dimension of a sintered material including a plurality of helical teeth, the sizing device comprising:
- a die provided with a through-hole in which the sintered material is disposed;
- a first punch and a second punch that are disposed opposite to each other in the through-hole, the first punch and the second punch being configured to press the sintered material therebetween;
- a thrust bearing that rotatably supports the first punch;
- and
- a first plate that abuts and stops the first punch at a predetermined position in a retreating direction of the first punch,
- wherein one of an inner peripheral surface of the through-hole of the die and an outer peripheral surface of the first punch has a plurality of first helical teeth that meshes with the plurality of helical teeth of the sintered material, and
- the predetermined position is a position where a load acting on the thrust bearing is less than or equal to a load bearing capacity of the thrust bearing.
Dependencies are inferred from the claim text.