Krishnamoorthy M Subramanian

US Patent:

6390906, May 21, 2002

Filed:

Jul 6, 1998

Appl. No.:

09/110824

Inventors:

Krishnamoorthy Subramanian - Groton MA

Assignee:

Saint-Gobain Abrasives Technology Company - Worcester MA

International Classification:

B24B 100

US Classification:

451296

Abstract:

Providing an abrasive belt with a pattern of holes through the abrasive-containing layer greatly increases the flexibility of the belt and reducing the need for flexing to generate a pattern of potentially destructive cracks in the abrasive surface.

US Patent:

7658665, Feb 9, 2010

Filed:

Oct 9, 2007

Appl. No.:

11/973524

Inventors:

Krishnamoorthy Subramanian - Lexington MA, US
Lukasz A. Glinski - Worcester MA, US

Assignee:

Saint-Gobain Abrasives, Inc. - Worcester MA
Saint-Gobain Abrasifs - Conflans-Sainte-Honorine

International Classification:

B24B 1/00

US Classification:

451 49, 451 53, 451 59

Abstract:

Methods for cylindrical grinding a workpiece are disclosed. The method includes cylindrical grinding, with a bonded abrasive wheel having a permeable structure that includes interconnected porosity, a workpiece at a specific cutting energy of less than about 12 Hp/inmin (29. 7 J/mm), and a material removal rate of at least about 1 in/minin (10. 8 mm/sec/mm)grinding. The bonded abrasive wheel may include at least about 3 volume percent of a filamentary sol-gel alpha-alumina abrasive grain having an average length-to-cross-sectional-width ratio of greater than about 4:1, or agglomerates thereof. In one embodiment, the workpiece is ground in the presence of a water soluble oil.

US Patent:

7708619, May 4, 2010

Filed:

May 23, 2006

Appl. No.:

11/439510

Inventors:

Krishnamoorthy Subramanian - Lexington MA, US
John A. Webster - Storrs CT, US
Peter Caputa, IV - Marlborough MA, US

Assignee:

Saint-Gobain Abrasives, Inc. - Worcester MA
Saint-Gobain Abrasifs - Conflans-Sainte-Honorine

International Classification:

B24B 1/00

US Classification:

451 11, 451 28, 451 53, 451 57

Abstract:

A method of producing a complex shape in a workpiece includes the steps of: i) grinding a workpiece at a maximum specific cutting energy of about 10 Hp/inmin with at least one bonded abrasive tool, thereby forming a slot in the workpiece; and ii) grinding the slot with at least one mounted point tool, thereby producing the complex shape in the slot. The bonded abrasive tool includes at least about 3 volume % of a filamentary sol-gel alpha-alumina abrasive grain having an average length-to-cross-sectional-width ratio of greater than about 4:1 or an agglomerate thereof. A method of producing a slot in a metallic workpiece having a maximum hardness value of equal to, or less than, about 65 Rc includes the step of grinding the workpiece with a bonded abrasive tool at a material removal rate in a range of between about 0. 25 in/minin and about 60 in/minin and at a maximum specific cutting energy of about 10 Hp/inmin.

US Patent:

20100006082, Jan 14, 2010

Filed:

Jul 9, 2009

Appl. No.:

12/499966

Inventors:

Lukasz A. Glinski - Worcester MA, US
David Graham - Oakham MA, US
Edward L. Lambert - Westboro MA, US
Krishnamoorthy Subramanian - Lexington MA, US

Assignee:

SAINT-GOBAIN ABRASIVES, INC. - Worcester MA
SAINT-GOBAIN ABRASIFS - Conflans Sainte Honorine

International Classification:

B28D 5/00
B28D 1/08
B28D 1/06

US Classification:

125 1602, 451449, 451 41, 125 38, 836511

Abstract:

A wire slicing system and method for using it include one or more of the following features: arrangements and/or operations that relate to handling the wire; apparatus and methods that relate to wire tensioning; equipment and techniques for manipulating the workpiece; arrangements and/or operations designed for cooling and swarf (debris) removal; controls and/or automation that can be used in conjunction with these features.

US Patent:

20110045292, Feb 24, 2011

Filed:

Aug 16, 2010

Appl. No.:

12/857374

Inventors:

Yinggang Tian - Shrewsbury MA, US
Ran Ding - Bolton MA, US
Susanne Liebelt - Norderstedt, DE
Krishnamoorthy Subramanian - Lexington MA, US

Assignee:

SAINT-GOBAIN ABRASIVES, INC. - Worcester MA
SAINT-GOBAIN ABRASIFS - Conflans-Sainte-Honorine

International Classification:

B23D 61/18
B24D 3/06

US Classification:

428372, 428381

Abstract:

An abrasive article includes an elongated body, a bonding layer including a metal overlying a surface of the elongated body, and a coating layer including a polymer material overlying the boding layer. The abrasive article further includes abrasive grains contained within the bonding layer and coating layer, and wherein the bonding layer comprises an average thickness (t) at least about 40% of the average grit size of the abrasive grains.

US Patent:

20120034847, Feb 9, 2012

Filed:

Aug 5, 2011

Appl. No.:

13/198916

Inventors:

John R. Besse - Beacon Fallls CT, US
David C. Graham - Oakham MA, US
Krishnamoorthy Subramanian - Lexington MA, US
Srinivasan Ramanath - Holden MA, US
Marc A. Lamoureux - Leicester MA, US

Assignee:

SAINT-GOBAIN ABRASIFS - Conflans-Sainte-Honorine
SAINT-GOBAIN ABRASIVES, INC. - Worcester MA

International Classification:

B24B 1/00

US Classification:

451 28, 451540

Abstract:

An abrasive tool includes a bonded abrasive body having abrasive grains contained within a bonding material, wherein the bonded abrasive body comprises a complex shape having a form depth (FD) of at least about 0.3. The form depth is described by the equation [(Rl−Rs)/Rl], wherein Rs is a smallest radius (Rs) at a point along the longitudinal axis of the bonded abrasive body and Rl is a largest radius (Rl) at a point along the longitudinal axis of the bonded abrasive body. The abrasive tool can be used to finish complex shapes in workpieces.

US Patent:

20120055097, Mar 8, 2012

Filed:

Nov 19, 2009

Appl. No.:

13/130749

Inventors:

Yinggang Tian - Shrewsbury MA, US
Krishnamoorthy Subramanian - Lexington MA, US

Assignee:

SAINT-GOBAIN ABRASIVES, INC. - Worcester MA

International Classification:

B24D 3/06
B23K 26/00
B24D 18/00
B23K 13/01

US Classification:

51309, 219615, 21912185

Abstract:

A method of forming an abrasive article includes directing a beam of electromagnetic radiation at a starting location on an abrasive preform comprising a bonding layer and abrasive grains within the bonding layer, and increasing the power of the beam of electromagnetic radiation to a scanning power while directed at the starting location. The method further includes changing the position of the beam relative to the abrasive preform from the starting location to a second location on the abrasive preform.

US Patent:

20120167482, Jul 5, 2012

Filed:

Dec 30, 2011

Appl. No.:

13/341862

Inventors:

Yinggang Tian - Shrewsbury MA, US
Arup K. Khaund - Northborough MA, US
Krishnamoorthy Subramanian - Lexington MA, US
John Pearlman - Berlin MA, US

Assignee:

SAINT-GOBAIN ABRASIFS - Conflans-Sainte-Honorine
SAINT-GOBAIN ABRASIVES, INC. - Worcester MA

International Classification:

B24D 3/06
B24D 11/00

US Classification:

51309, 51307

Abstract:

An abrasive article having a substrate, a tacking film overlying the substrate, abrasive particles comprising a coating layer bonded to the tacking film such that a bond between the coating layer and the tacking film defines a metallic bonding region, and a bonding layer overlying the abrasive particles and the tacking film,