The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2012
Filed:
Sep. 18, 2009
Koki Mizuno, Tsushima, JP;
Toshiyuki Morita, Tokai, JP;
Koki Mizuno, Tsushima, JP;
Toshiyuki Morita, Tokai, JP;
Aisin AW Co., Ltd., Anjo, JP;
Abstract
A method for manufacturing a carburized part that includes vacuum carburizing a steel under a reduced pressure of 2 kPa or less, so that a surface carbon concentration after slow cooling performed after carburizing falls in a range of 0.9 to 1.5%, performing the slow cooling by air cooling at such a cooling rate that causes pearlite transformation, to transform a surface structure into pearlite; and thereafter, performing induction hardening under such heating and cooling conditions that produce fine carbides in a range of up to 0.1 mm from a surface by finely dividing cementite in the pearlite structure, where the fine carbides contain 90% or more of carbides of 1 μm or less.