Yuefeng F Luo

US Patent:

7655126, Feb 2, 2010

Filed:

Mar 27, 2006

Appl. No.:

11/277544

Inventors:

Yuefeng Luo - Ann Arbor MI, US

Assignee:

Federal Mogul World Wide, Inc. - Southfield MI

International Classification:

C25D 5/02

US Classification:

205136, 205118, 204224 R, 204280

Abstract:

A method for making a gasket () for an internal combustion engine () includes forming a generally annual stopper () on a metallic gasket body () through the process of electrochemical deposition. An electrolytic cell is completed with the gasket body () forming a cathode. The stopper () is formed with a contoured compression surface () by selectively varying the electrical energy delivered to selected electrodes () over time. Electrolyte () rich with metallic ions is pumped at high speed through the inter-electrode gap. A PC controller () switches selected electrodes () ON at certain times, for certain durations, which cause metallic ions in the electrolyte () to reduce or deposit onto the gasket body (), which are built in columns or layers into a three-dimensional formation approximating the target surface profile () for the compression surface (). The subject method for building a three-dimensional formation can be applied to work parts other than cylinder head gaskets ().

US Patent:

7850831, Dec 14, 2010

Filed:

Oct 30, 2006

Appl. No.:

11/554198

Inventors:

Yuefeng Luo - Ann Arbor MI, US

Assignee:

Federal Mogul World Wide, Inc. - Southfield MI

International Classification:

B23H 7/18

US Classification:

2042281, 205642, 205644

Abstract:

An electrochemical machining apparatus and method for machining a workpiece (). The apparatus provides a pulse of electric power, which is conducted from the workpiece (), to an electrolyte () flowing through a gap (), and then to an electrode (). Material is eroded from the workpiece () when the pulse of electric power is applied, thus machining the workpiece (). The apparatus includes a power supply () to supply the electric power and a switching portion () for producing the pulse by switching the electric power ON and OFF. The switching portion () is capable of producing a pulse of electric power with a pulse duration of about 2 microseconds and a current of at least about 2800 amperes.

US Patent:

7867374, Jan 11, 2011

Filed:

Sep 30, 2005

Appl. No.:

11/241206

Inventors:

William J. Zdeblick - Ann Arbor MI, US
Yuefeng Luo - Ann Arbor MI, US

Assignee:

Federal-Mogul World Wide, Inc. - Southfield MI

International Classification:

B23H 3/04
B23H 7/32

US Classification:

205649, 204224 M, 2042295

Abstract:

An apparatus and method of electrochemical machining utilizes a computer controlled static array of electrically insulated cathode sections to selectively and individually energize the electrodes for the purpose of shaping the surface of a part. The tightly clustered array of electrodes can be formed by individual wires as an example. The waste reaction products may be managed so as to improve machining accuracy. The electrodes can be composed of materials capable of generating an oxide layer or that resist electrolytic dissolution to combat the problem of crossover erosion in closely spaced conditions. An alternative approach to remedy crossover erosion is to extend the reach of insulation into the gap space between tool and part.

US Patent:

8168913, May 1, 2012

Filed:

May 28, 2009

Appl. No.:

12/473318

Inventors:

Yuefeng Luo - Schenectady NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23H 1/00
B23H 7/14
B23H 7/26
B23H 7/30

US Classification:

219 6915, 219 6913, 219 6916, 219 6918

Abstract:

An EDM die sinking device includes a tank for holding a fluid, and at least one electrode in the tank having a shape for imparting to a first portion of a workpiece. A workpiece holder positions the workpiece at least partially immersed in the fluid and alternately moves the workpiece between an inoperable position and a first operable position of the first electrode at which electric discharge machining occurs on the first portion. A pulse generator creates an electric discharge between the first portion and the first electrode to remove material from the first portion in response to the workpiece being in the first operable position. Movement of the workpiece from the electrode flushes particle containing fluid away from the workpiece and the electrode. A segmented electrode includes a separate pulse generator for each segment may also be employed.

US Patent:

8183491, May 22, 2012

Filed:

May 26, 2009

Appl. No.:

12/471683

Inventors:

Yuefeng Luo - Mechanicville NY, US
William Edward Adis - Scotia NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23H 1/00

US Classification:

219 6911, 219 6915, 219 692

Abstract:

An electric discharge machining (EDM) device includes a circular blade, a motor coupled to the circular blade for rotating the circular blade, and an electric discharge control system operatively coupled to the circular blade and a workpiece. The electric discharge control system causes the rotating circular blade to cut the workpiece using electric discharge machining. The device allows for removal of large chunks of material using EDM, minimizing the number of cuts, time and energy required to create a part.

US Patent:

8470160, Jun 25, 2013

Filed:

Sep 28, 2009

Appl. No.:

12/567835

Inventors:

Yuefeng Luo - Mechanicville NY, US
William E. Adis - Scotia NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23H 3/00

US Classification:

205651, 205649, 205654

Abstract:

A method of electrochemical machining that includes the steps of: positioning a workpiece and a tooling piece in a first position; moving at least one of the workpiece and the tooling piece toward the other such that the workpiece and the tooling piece occupy a second position; moving at least one of the workpiece and the tooling piece away from the other such that the workpiece and the tooling piece occupy a third position; and during at least a portion of the moving of the workpiece and/or the tooling piece from the first position to the second position and from the second position to the third position, using a power supply to apply a voltage across a gap formed between the workpiece and the tooling piece.

US Patent:

8529736, Sep 10, 2013

Filed:

May 25, 2010

Appl. No.:

12/787270

Inventors:

Yuefeng Luo - Mechanicville NY, US
William Edward Adis - Scotia NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23H 7/00
B23H 3/00
C25F 7/00

US Classification:

204224M, 20429701, 205640, 205672, 205666

Abstract:

According to various embodiment, a system includes an electrolytic cutting tool. The electrolytic cutting tool includes a first cathode configured to be positioned at a first gap away from a first side of a workpiece, a second cathode configured to be positioned at a second gap away from a second side of the workpiece. The first and second cathodes are positioned opposite from one another. The electrolytic cutting tool also includes a first electrolyte passage configured to flow a first electrolyte through the first gap between the first cathode and the workpiece, a second electrolyte passage configured to flow a second electrolyte through the second gap between the second cathode and the workpiece, and a power supply configured to flow current through the first gap and the second gap to cause electrolytic dissolution through the workpiece from both the first side and the second side.

US Patent:

8597489, Dec 3, 2013

Filed:

Jul 8, 2010

Appl. No.:

12/832693

Inventors:

Yuefeng Luo - Mechanicville NY, US
William Edward Adis - Scotia NY, US
Laurence Scott Duclos - Unity ME, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23H 3/00
B23H 7/00
B23H 9/10

US Classification:

205660, 205652, 205653, 205668, 205670

Abstract:

Conventional electrochemical machining process requires fixed shaped tool cathodes, which makes retooling time consuming and expensive. Flexible tool cathodes include elastically deformable cathodes that can deform in two or three dimensions and can adapt to the contour of the workpiece while the workpiece is moving relative to the flexible tool cathode. That is, the flexible tool cathode can perform tracing. Certain flexible tool cathodes can be also used for special configurations such corners and edges. The flexible tool cathodes can be used to polish, finish, or shape the workpiece through electrochemical processes.