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:
Apr. 09, 2019
Filed:
Sep. 16, 2016
Applicant:
GM Global Technology Operations Llc, Detroit, MI (US);
Inventors:
Maurice G Meyer, Fenton, MI (US);
Qigui Wang, Rochester Hills, MI (US);
Jianghuai Yang, Rochester Hills, MI (US);
Assignee:
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 1/30 (2006.01); C21D 1/42 (2006.01); C22F 1/04 (2006.01); F02F 1/00 (2006.01); F02F 1/18 (2006.01); F02F 7/00 (2006.01); H05B 6/06 (2006.01); H05B 6/10 (2006.01); C21D 1/613 (2006.01);
U.S. Cl.
CPC ...
C22F 1/04 (2013.01); C21D 1/30 (2013.01); C21D 1/42 (2013.01); C21D 1/613 (2013.01); F02F 1/004 (2013.01); F02F 1/18 (2013.01); H05B 6/06 (2013.01); H05B 6/101 (2013.01); F02F 7/0085 (2013.01); F02F 2200/06 (2013.01);
Abstract
A method for relieving residual stress in cast-in-place liners of high pressure die cast (HPDC) engine blocks to prevent cracking in the liners during the machining process. The method includes locally heating up the liners and the surrounding engine block material through rapid induction heating and then cooling down the liners and surrounding engine block material with still ambient air to a predetermined temperature after the residual stress has been reduced to a desired threshold.