Yang Tse Cheng

US Patent:

6929757, Aug 16, 2005

Filed:

Aug 25, 2003

Appl. No.:

10/647359

Inventors:

John C. Ulicny - Oxford MI, US
Yang T. Cheng - Rochester Hills MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

H01F001/44

US Classification:

252 6262, 148105, 148238, 148230

Abstract:

A magnetorheological fluid containing magnetorheological particles which are resistant to oxidation having regions rich in diffused nitrogen located therein and a method for producing such magnetorheological fluid.

US Patent:

7195817, Mar 27, 2007

Filed:

Sep 29, 2003

Appl. No.:

10/673762

Inventors:

Leonid C Lev - West Bloomfield MI, US
Yang T Cheng - Rochester Hills MI, US
Michael J Lukitsch - Port Huron MI, US
Anita M Weiner - West Bloomfield MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G11B 5/64

US Classification:

428336, 51307, 51309, 428216, 428408, 428469, 428472, 428697, 428698, 428699

Abstract:

A diamond coated cutting tool is disclosed having a either steel or cemented carbide substrate. The interior layer disposed between the diamond coating and the substrate inhibits the diffusion of carbon and other species.

US Patent:

7480975, Jan 27, 2009

Filed:

Jan 19, 2006

Appl. No.:

11/335192

Inventors:

Mark W. Verbrugge - Troy MI, US
Jihui Yang - Lakeshore, CA
Yang T. Cheng - Rochester Hills MI, US
Michael J. Lukitsch - Marysville MI, US
Alan L. Browne - Grosse Pointe MI, US
Nilesh D. Mankame - Ann Arbor MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

B21D 22/10
B21D 37/16
B23Q 3/00
B23Q 7/00
B23P 11/02
B23P 17/00

US Classification:

29559, 29405, 294211, 29447, 72 62, 723421, 723424, 723427, 269310

Abstract:

A fixture device generally includes a base member, a reconfigurable pad comprising a shape memory material configured to selectively conform to a surface contour of a workpiece, and a thermoelectric unit in operative communication with the shape memory material of the reconfigurable pad. A process for operating a fixture device includes passing a current in a first direction through a thermoelectric unit in operative communication with a reconfigurable pad in an amount effective to heat a shape memory material therein to or above a shape setting temperature, contacting a surface of a workpiece with the reconfigurable pad, cooling the shape memory material below the shape setting temperature, and fixturing the workpiece with the fixture device.

US Patent:

7563334, Jul 21, 2009

Filed:

Nov 16, 2006

Appl. No.:

11/560520

Inventors:

Yijun Zhang - Albany CA, US
Yang T. Cheng - Troy MI, US
David S. Grummon - E. Lansing MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

C22F 1/10

US Classification:

148563, 148675

Abstract:

A method for forming a two-way shape memory surface includes thermomechanically training a shape memory alloy under substantially constant indentation strain. Thermomechanical training includes removeably securing an indenter to a surface of the shape memory alloy in its martensite phase, so that an indent is formed in the surface. The shape memory alloy is then heated to its austenite phase while the indenter is secured thereto. The shape memory alloy is then quenched to its martensite phase while the indenter is secured thereto. After thermomechanical training, the shape memory alloy surface exhibits a first indent depth when in its martensite phase, and a second, different indent depth when in its austenite phase. Also disclosed herein is a method for forming one-way and two-way reversible surface protrusions on shape memory alloys.

US Patent:

7651732, Jan 26, 2010

Filed:

Sep 7, 2007

Appl. No.:

11/851594

Inventors:

Yang T. Cheng - Troy MI, US
Mark W. Verbrugge - Troy MI, US
Michael P. Balogh - Novi MI, US
Daniel E. Rodak - Southfield MI, US
Michael Lukitsch - Marysville MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

C23C 16/00
C23C 16/06
C23C 14/30

US Classification:

427250, 42725529, 42725532, 427595, 427596, 427597

Abstract:

Films of magnesium mixed with titanium are produced by non-equilibrium alloying processes such as electron beam evaporation of magnesium and titanium ingots in a very low pressure chamber. Such magnesium-titanium films form as single phase solid solutions. Titanium is inherently resistant to corrosion and its admixture with magnesium in solid solution provides a new composition that is less subject to intra-film galvanic corrosion. The magnesium-titanium films also provide relatively hard and strong coatings.

US Patent:

7730753, Jun 8, 2010

Filed:

Feb 6, 2007

Appl. No.:

11/671495

Inventors:

Paul E. Krajewski - Sterling Heights MI, US
Yang T. Cheng - Troy MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

B21D 22/00
C21D 1/68
B22C 3/00

US Classification:

72 42, 72 39, 72 41, 72 43, 72 46, 148537, 148696, 148703, 148708, 508154, 508155

Abstract:

The hot stretch forming of sheet metal alloys, such as highly deformable aluminum alloy materials, is improved by using a lubricant comprising bismuth between the forming tool and the engaged surface of the sheet metal. A precursor of bismuth, such as bismuth subsalicylate, may be dispersed in a liquid and applied to the sheet metal before the sheet is heated to its forming temperature. Other lubricants such as boron nitride may be combined with the bismuth precursor. The precursor compound is decomposed to bismuth (or bismuth and carbon in the case of bismuth subsalicylate) which lubricates contact between the surface(s) of the sheet and the forming tool during forming and removal of the formed part from the tool.

US Patent:

7866295, Jan 11, 2011

Filed:

Oct 5, 2007

Appl. No.:

11/867859

Inventors:

Fanghui Shi - Rochester Hills MI, US
Yang T. Cheng - Troy MI, US

Assignee:

GM Global Technology Operations, Inc. - Detroit MI

International Classification:

F02F 3/00

US Classification:

1231936, 1231934, 1231932

Abstract:

An internal combustion engine is provided having a cylinder case with at least one cylinder bore wall defining at least one cylinder bore. At least one piston is reciprocally movable within the at least one cylinder bore. The at least one piston includes at least one skirt portion preferably having a barrel-shaped profile. The cylinder bore wall has an oleophobic characteristic, while the at least one skirt portion has an oleophilic characteristic. The oleophobic and oleophilic characteristic is produced by at least one of coating and machining the at least one cylinder bore wall and the at least one skirt portion, respectively.

US Patent:

7879402, Feb 1, 2011

Filed:

Mar 1, 2007

Appl. No.:

11/680777

Inventors:

Leonid C. Lev - West Bloomfield MI, US
Jon T. Carter - Farmington MI, US
Yang T. Cheng - Troy MI, US
Carolina C. Ang - Bloomfield MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

B23B 47/28

US Classification:

427307, 408 1 R

Abstract:

A method for forming an aperture includes stamping an aperture into the article using a pellet, and refining aperture shape(s) and/or aperture dimensions. Methods for forming articles having reduced residual compressive stress are also disclosed. Very generally, the methods include establishing a diamond coating on at least a portion of a substrate, and applying a stress-relief process to the diamond coating, the substrate, or combinations thereof.