High speed grinding wheel
First Claim
1. A method of grinding a work piece comprising:
- providing a grinding tool consisting essentially ofa core having a core strength parameter of at least about 60 MPa-cm3 /g;
an abrasive segment affixed to the circumference of the core, wherein the abrasive segment comprises conventional abrasive non-superabrasive grains embedded in a bond, the abrasive segment having a rim strength parameter of at least about 10 MPa-cm3 /g; and
a means for adhering the abrasive segment to the core; and
moving the abrasive segment at a tangential contact speed of at least about 125 m/sec in contact with the work piece.
1 Assignment
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Accused Products
Abstract
A method of obtaining superabrasive grinding performance from tools employing less expensive, non-superabrasive conventional abrasive grain involves operating the conventional abrasive tool at ultra high tangential contact speed, (that is at least about 125 m/s). Such ultra high operating speeds can be achieved with segmented abrasive grinding wheels having segments formed from vitreous or resin bonded particles of aluminum oxide, silicon oxide, iron oxide, molybdenum oxide, vanadium oxide, tungsten carbide, silicon carbide and the like. The abrasive segments can be cemented to the core of the tool with an adhesive such as epoxy cement. Abrasive segments can be made to a significantly greater depth than traditional superabrasive-bearing segments, and consequently, should provide long life as well as high performance. Additionally, conventional abrasive segments are easier to true and dress and to make into intricate profiles for grinding complex shaped work pieces.
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Citations
19 Claims
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1. A method of grinding a work piece comprising:
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providing a grinding tool consisting essentially of a core having a core strength parameter of at least about 60 MPa-cm3 /g; an abrasive segment affixed to the circumference of the core, wherein the abrasive segment comprises conventional abrasive non-superabrasive grains embedded in a bond, the abrasive segment having a rim strength parameter of at least about 10 MPa-cm3 /g; and a means for adhering the abrasive segment to the core; and moving the abrasive segment at a tangential contact speed of at least about 125 m/sec in contact with the work piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of making an abrasive wheel comprising:
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blending grains of a conventional abrasive with a vitrified bond composition to obtain a uniform mixture; shaping the mixture to form an abrasive segment preform; firing the preform for a time and at a temperature effective to fix the abrasive grains in the bond with a rim strength parameter of at least about 60 MPa-cm3 /g, thereby obtaining an abrasive segment; and attaching the abrasive segment with a cement to a core having a core strength parameter of at least about 10 MPa-cm3 /g, wherein the cement has thermal stability and adhesive strength effective to withstand grinding of a work piece at a tangential contact speed of greater than 125 m/s. - View Dependent Claims (18, 19)
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Specification