An abrasive grinding wheel having an annular grinding face depending from a substantially circular body includes a tubular inner wall which defines an axial bore configured to convey coolant in a downstream direction therethrough. The inner wall is coupled to a concave body portion terminating at an
An abrasive grinding wheel having an annular grinding face depending from a substantially circular body includes a tubular inner wall which defines an axial bore configured to convey coolant in a downstream direction therethrough. The inner wall is coupled to a concave body portion terminating at an inner periphery of the annular grinding face. A flange having an outer periphery disposed, in representative embodiments, within about 20 mm of the inner periphery of the grinding face, is superposed with the concave body portion, to define a fluid flow passage between the flange and the concave body portion. The fluid flow passage is in fluid communication with the axial bore and with the grinding face, so that during operable rotation of the grinding wheel, coolant flowing downstream through the bore is conveyed radially outward into the fluid flow passage for delivery to the grinding face.
대표청구항▼
Having thus described the invention, what is claimed is: 1. An abrasive grinding tool comprising: a grinding wheel having an annular grinding face depending from a substantially circular body; said body configured for being operably engaged by a machine spindle for rotation about a central axis; sa
Having thus described the invention, what is claimed is: 1. An abrasive grinding tool comprising: a grinding wheel having an annular grinding face depending from a substantially circular body; said body configured for being operably engaged by a machine spindle for rotation about a central axis; said body having a tubular innermost wall defining an axial bore configured to convey coolant in a downstream direction therethrough from a proximal end to a distal end thereof; said innermost wall coupled to a concave body portion terminating at an inner periphery of the annular grinding face; a flange disposed within the concave body portion, in superposed orientation therewith; said flange having an outer periphery disposed within about 20 mm of the inner periphery of said grinding face; said flange and said concave body portion defining a fluid flow passage therebetween, the fluid flow passage being in fluid communication with said axial bore and with said grinding face; said fluid flow passage having a minimum transverse cross-sectional area less than or equal to about 300 percent that of said bore; wherein during operable rotation of the grinding wheel, coolant flowing downstream through the bore is conveyed radially outward into said fluid flow passage for delivery to the grinding face. 2. The grinding tool of claim 1, wherein said outer periphery of said flange is disposed within about 10 mm of the inner periphery of said grinding face. 3. The grinding tool of claim 1, wherein said outer periphery of said flange is disposed within about 5 mm of the inner periphery of said grinding face. 4. The grinding tool of claim 1, comprising a medial fluid flow passage communicably coupling said axial bore to said fluid flow passage. 5. The grinding tool of claim 4, wherein said medial fluid flow passage comprises a portion of said innermost wall extending radially outward and downstream from the distal end of said bore. 6. The grinding tool of claim 4, wherein said medial fluid flow passage comprises a plurality of pathways extending through said body. 7. The grinding tool of claim 4, wherein said medial fluid flow passage comprises an upstream portion of said concave body portion. 8. The grinding tool of claim 4, wherein said medial fluid flow passage is disposed between said bore and said minimum transverse cross-sectional area, said medial fluid flow passage having a transverse cross-sectional area greater than said minimum transverse cross-sectional area. 9. The grinding tool of claim 1, comprising a coupling fastened to said body, said coupling configured for being operably engaged by a milling machine spindle. 10. The grinding tool of claim 1, wherein said body and said grinding face form a unitary component. 11. The grinding tool of claim 1, wherein said grinding face comprises a plurality of segments disposed in spaced relation about a periphery of said grinding wheel. 12. The grinding tool of claim 1, wherein the concave body portion comprises a frusto-conical wall disposed at an acute angle to the central axis. 13. The grinding tool of claim 12, wherein the flange comprises a frusto-conical wall disposed at an acute angle to the central axis, the acute angle being parallel to the angle of the frusto-conical wall of the concave body portion. 14. The grinding tool of claim 12, wherein the flange comprises a frusto-conical wall disposed at an acute angle to the central axis, the angle of the flange wall being larger than the angle of the frusto-conical wall of the concave body portion, wherein the flange wall and the frusto-conical wall of the concave body portion are not parallel and converge at the downstream portion of the fluid flow passage without blocking the fluid flow passage. 15. The grinding tool of claim 1, further comprising a plurality of channels disposed in fluid communication with said grinding face and said fluid flow passage. 16. The grinding tool of claim 15, wherein said channels are disposed within said grinding face. 17. The grinding tool of claim 15, wherein said plurality of channels extend into the fluid flow passage. 18. The grinding tool of claim 15, wherein said plurality of channels extend radially inward of the periphery of said flange. 19. The grinding tool of claim 18, wherein said outer periphery of said flange is coterminous with the inner periphery of said grinding face. 20. The grinding tool of claim 1, wherein said grinding face comprises a single layer of abrasive disposed within a bond material. 21. The grinding tool of claim 1, wherein said grinding face comprises abrasive grain selected from the group consisting of alumina, silica, silicon carbide, zirconia-alumina, garnet, emery, diamond, and cubic boron nitride (CBN), disposed within a bond selected from the group consisting of organic, resinous, and vitrified bond, bronze, brass, copper, tin, zinc, cobalt, iron, nickel, silver, aluminum, indium, antimony, titanium, zirconium, chromium, tungsten, and their alloys, and mixtures thereof. 22. The grinding tool of claim 21, wherein said grains have a grit size within a range of: at least about 1 micron; and up to about 1181 microns. 23. The grinding tool of claim 22, wherein said grains have a grit size within a range of: at least about 3 microns; and up to about 710 microns. 24. The grinding tool of claim 1, wherein during operable rotation of the grinding wheel, coolant flowing downstream through the bore is conveyed radially outward into said fluid flow passage for delivery to the grinding face in a substantially laminar flow. 25. The grinding tool of claim 1, wherein said flange is unitary with said body. 26. A method for grinding a workpiece to form a flat surface, said method comprising: (a) providing an abrasive face grinding wheel having an annular grinding face depending from a substantially circular body, the body configured for being operably engaged by a machine tool spindle for rotation about a central axis, the body having a tubular inner wall defining an axial bore configured to convey coolant in a downstream direction therethrough from a proximal end to a distal end thereof, the inner wall coupled to a concave body portion terminating at an inner periphery of the annular grinding face, a flange disposed within the concave body portion, in superposed orientation therewith, said flange having an outer periphery disposed within about 20 mm of an inner periphery of said grinding face; said flange and said concave body portion defining a fluid flow passage therebetween, said fluid flow passage being in fluid communication with said axial bore and with said grinding face, said fluid flow passage having a transverse cross-sectional area less than or equal to about 300 percent that of said bore; (b) orienting the central axis at a predetermined angle α relative to the workpiece; (c) rotating the grinding wheel about the central axis; (d) delivering coolant flow downstream through the bore, for conveyance radially outward through the fluid flow passage for delivery to the grinding face in a substantially laminar flow; (e) translating the grinding wheel towards the workpiece along a tool path parallel thereto, wherein said grinding face engages and removes material from the workpiece. 27. The method of claim 26, wherein a medial fluid flow passage communicably couples the axial bore to the fluid flow passage. 28. The method of claim 27, wherein said medial fluid flow passage is disposed between said bore and said minimum transverse cross-sectional area, said medial fluid flow passage having a transverse cross-sectional area greater than said minimum transverse cross-sectional area. 29. The method of claim 26, wherein said abrasive face grinding wheel has a plurality of channels disposed in fluid communication with said grinding face and said fluid flow passage. 30. The method of claim 29, wherein said channels are disposed within said grinding face and extend into the fluid flow passage. 31. The method of claim 26, wherein said grinding face comprises a single layer of abrasive disposed within a bond material. 32. The method of claim 26, wherein the grinding face comprises abrasive disposed within a vitrified matrix. 33. The method of claim 26, wherein said angle α is oblique. 34. A grinding system comprising: an abrasive face grinding wheel having an annular grinding face depending from a substantially circular body; the body configured for being operably engaged by a machine tool spindle for rotation about a central axis; the body having a tubular innermost wall defining an axial bore configured to convey coolant in a downstream direction therethrough from a proximal end to a distal end thereof; the inner wall extending to a concave body portion terminating at an inner periphery of the annular grinding face; a flange disposed within the concave body portion, in superposed orientation therewith; said flange and said concave body portion defining a fluid flow passage therebetween; said fluid flow passage having a transverse cross-sectional area less than or equal to about 300 percent that of said bore; a plurality of channels disposed within said grinding face and extending radially inward of the periphery of said flange, wherein said plurality of channels is disposed in fluid communication with said grinding face and with said fluid flow passage; wherein during operable rotation of the grinding wheel, coolant flowing downstream through the bore is conveyed radially outward into said fluid flow passage and into said plurality of channels for delivery to the grinding face. 35. A method for grinding a workpiece to form a flat surface, said method comprising: (a) providing an abrasive face grinding wheel having an annular grinding face depending from a substantially circular body, the body configured for being operably engaged by a machine tool spindle for rotation about a central axis, the body having a tubular innermost wall defining an axial bore configured to convey coolant in a downstream direction therethrough from a proximal end to a distal end thereof, the innermost wall coupled to a concave body portion terminating at an inner periphery of the annular grinding face, a flange disposed within the concave body portion, in superposed orientation therewith, said flange and said concave body portion defining a fluid flow passage therebetween, said fluid flow passage being in fluid communication with said axial bore and with said grinding face, said fluid flow passage having a transverse cross-sectional area less than or equal to about 300 percent that of said bore; said flange having an outer periphery disposed sufficiently close to an inner periphery of said grinding face to maintain laminar coolant flow at a point of grinding; (b) orienting the central axis at a predetermined angle α relative to the workpiece; (c) rotating the grinding wheel about the central axis; (d) delivering coolant flow downstream through the bore, for conveyance radially outward through the fluid flow passage for delivery of laminar coolant flow to the point of grinding; (e) translating the grinding wheel towards the workpiece along a tool path parallel thereto, wherein said grinding face engages and removes material from the workpiece.
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이 특허에 인용된 특허 (13)
Miller Bradley J. ; Hagan John, Abrasive inserts for grinding bimetallic components.
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