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公开(公告)号：CA2477673C
公开(公告)日：2008-03-25
申请号：CA2477673
申请日：2004-08-16
Applicant: SMITH INTERNATIONAL
Inventor： CAWTHORNE CHRIS E , GRIFFO ANTHONY , RICHMAN LANCE T , VISWANADHAM RAMAMURTHY
Abstract: A shaped insert that includes a top portion, and a grip length, wherein the grip length is modified to have a non-uniform cross sectional area is disclosed. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is modified such that the insert is non-cylindrical. In another case, a shaped insert includes a top portion, and a grip length, wherein the grip length is coated in a non-uniform manner.
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公开(公告)号：CA2551393A1
公开(公告)日：2007-01-01
申请号：CA2551393
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY
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公开(公告)号：CA2477644C
公开(公告)日：2010-05-25
申请号：CA2477644
申请日：2004-08-16
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY , GRIFFO ANTHONY
IPC: C23C4/10 , B05D3/00 , B23P15/28 , C23C4/06 , C23C4/12 , C23C24/08 , E21B10/08 , E21B10/22 , E21B10/46 , E21B10/50
Abstract: A method for applying a wear-resistant material to a rock bit is disclosed that includes depositing a coating on a selected area of the rock bit, applying a heated wear-resistant material using a laser assisted cladding apparatus to a selected portion of the rock bit, wherein the coating is selected to have material properties to prevent significant bonding between the heated wear-resistant material and the coated area of the rock bit.
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公开(公告)号：CA2551393C
公开(公告)日：2010-03-30
申请号：CA2551393
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY
Abstract: A drill bit including a bit body having an upper end adapted to be detachably secured to a drill string and at least one leg at its lower end, each leg having a downwardly and inwardly extending journal bearing, at least one roller cone mounted on each journal bearing, at least one cutting element disposed on the at least one roller cone; and a hardfacing overlay on at least a portion of at least one of an inner surface of the at least one roller cone and a surface of the journal bearing, wherein a composition of the hardfacing overlay proximate an outside surface of the hardfacing overlay is different from a composition of the hardfacing overlay proximate an interface between the hardfacing overlay and the at least a portion of at least one of the inner surface of the at least one roller cone and the surface of the journal bearing is disclosed.
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公开(公告)号：CA2551389A1
公开(公告)日：2007-01-01
申请号：CA2551389
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY , LOCKWOOD GREGORY T , LIANG DAH-BEN
IPC: E21B10/46
Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.
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Patent Agency Ranking
公开(公告)号：DE602006003272D1
公开(公告)日：2008-12-04
申请号：DE602006003272
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY , LIANG DAH-BEN , LOCKWOOD GREGORY T
Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.
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公开(公告)号：GB2408474B
公开(公告)日：2006-03-15
申请号：GB0425973
申请日：2004-11-25
Applicant: SMITH INTERNATIONAL
Inventor： LOCKWOOD GARY , VISWANADHAM RAMAMURTHY , GRIFFO ANTHONY
Abstract: A hardfacing composition for a drill bit includes a carbide phase made from carbide particles having a barrier coating disposed thereon, and binder alloy. Also, a drill bit includes a steel bit body having hardfacing thereon and having at least one blade thereon, at least one cutter pocket disposed on the blade, at least one cutter disposed in the cutter pocket; and hardfacing applied to at least a select portion of the drill bit, the hardfacing being formed with a hardfacing composition that includes a carbide phase formed from carbide particles having a barrier coating disposed thereon; and a binder alloy.
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公开(公告)号：CA2551389C
公开(公告)日：2010-12-14
申请号：CA2551389
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： VISWANADHAM RAMAMURTHY , LIANG DAH-BEN , LOCKWOOD GREGORY T
Abstract: A cutting tool that includes at least one tungsten carbide cutting element disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.
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公开(公告)号：AU2006202788B2
公开(公告)日：2009-04-02
申请号：AU2006202788
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： LIANG DAH-BEN , LOCKWOOD GREGORY T , VISWANADHAM RAMAMURTHY
Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.
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公开(公告)号：AU2006202788A1
公开(公告)日：2007-01-18
申请号：AU2006202788
申请日：2006-06-30
Applicant: SMITH INTERNATIONAL
Inventor： LIANG DAH-BEN , LOCKWOOD GREGORY T , VISWANADHAM RAMAMURTHY
Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.
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