Rotary machining tools with side coolant delivery

Claim 1

An arrangement for supplying a cooling medium to a rotating metal-machining cutting tool provided with cooling medium ducts which communicate with cooling medium bores provided in a cylindrical shank thereof, including a cooling medium supply ring which is supported on and sealed with respect to said cylindrical shank of said tool, can be connected radially outwardly by releasable coupling means with stationary cooling medium supply means and is connected radially inwardly by an annular duct with said cooling medium bores in said shank of said tool, said shank of said tool being receivable in a drive spindle rotatably supported in a housing, said releasable coupling means including a coupling head which is supported near said cooling medium supply ring, is in permanent communication with said supply means and has an outlet bore extending substantially radially with respect to the axis of rotation of said tool shank into a generally radially inwardly facing first sealing surface thereof, and wherein said cooling medium supply ring has a second sealing surface which cooperates with and is arranged to sealingly engage said first sealing surface and in which is provided a substantially radially extending inlet bore connected to said annular duct, the improvement comprising wherein said cooling medium supply ring is rotatably supported on said tool shank and has a radially projecting coupling piece which has thereon said second sealing surface; wherein both said first and second sealing surfaces are substantially flat; wherein said first sealing surface is inclined, in the circumferential direction of said cooling medium supply ring at an acute angle of from 2° to 10° with respect to a line tangent to a circle which is concentric with the axis of said tool shank, which tangent line extends through said outlet bore approximately perpendicular thereto, wherein the distance between said first sealing surface and the axis of said tool shank decreases progressively in the direction of rotation of said tool; wherein said first sealing surface, in the general direction of the axis of said tool shank, diverges in a direction toward a free end of said tool at an acute angle of from 0° to 10°, inclusive; and wherein said second sealing surface has substantially the same inclination as said first sealing surface.

Claim 16

An apparatus for supplying a fluid to a fluid passageway in a cutting tool, comprising a housing, a spindle supported on said housing for rotation about an axis, means for driving said spindle in a first rotational direction, said tool having a shank portion of generally circular cross section and an opening in said shank portion in fluid communication with said passageway therein, means for releasably supporting said tool on said spindle for rotation therewith, said shank portion of said tool being substantially coaxial with said axis, a cooling medium supply ring encircling and rotatably supported on said shank portion of said tool, having means defining a first surface thereon which faces substantially radially outwardly and slightly in said first rotational direction, and having means defining an opening in said first surface, said cooling medium supply ring having passageway means providing fluid communication between said opening in said first surface and said opening in said shank portion of said tool, means for yieldably resisting rotation of said cooling medium supply ring relative to said tool, a coupling head supported on said housing and having means defining a second surface which faces substantially radially inwardly and slightly in a direction opposite said first rotational direction, said second surface being axially aligned with said first surface and sealingly engageable therewith when said first and second surfaces are angularly aligned, rotation of said tool relative to said housing causing said rotation resisting means to rotate said cooling medium supply ring into a position in which said first and second surfaces sealingly engage, said engagement of said first and second surfaces preventing further rotation of said cooling medium supply ring relative to said housing, said tool thereafter rotating within said cooling medium supply ring and said rotation resisting means thereby maintaining said sealing engagement of said first and second surfaces, and said coupling head having an opening in said second surface and means for supplying a fluid thereto, said openings in said first and second surfaces being in fluid communication when said first and second surfaces are sealingly engaged.

Claim 17

An apparatus for supplying a fluid to a fluid passageway in a cutting tool, comprising a housing, a spindle supported on said housing for rotation about an axis, means for driving said spindle in a first rotational direction, said tool having a shank portion of generally circular cross section and an opening in said shank portion in fluid communication with said passageway therein, means for releasably supporting said tool on said spindle for rotation therewith, said shank portion of said tool being substantially coaxial with said axis, a cooling medium supply ring encircling and rotatably supported on said shank portion of said tool, having means defining a first surface thereon which faces substantially radially outwardly and slightly in said first rotational direction, and having means defining an opening in said first surface, said cooling medium supply ring having passageway means providing fluid communication between said opening in said first surface and said opening in said shank portion of said tool, means for yieldably resisting rotation of said cooling medium supply ring relative to said tool, a coupling head supported on said housing and having means defining a second surface which faces substantially radially inwardly and slightly in a direction opposite said first rotational direction, said second surface being axially aligned with said first surface and sealingly engageable therewith when said first and second surfaces are angularly aligned, rotation of said tool relative to said housing causing said rotation resisting means to rotate said cooling medium supply ring into a position in which said first and second surfaces sealingly engage, said engagement of said first and second surfaces preventing further rotation of said cooling medium supply ring relative to said housing, said tool thereafter rotating within said cooling medium supply ring and said rotation resisting means thereby maintaining said sealing engagement of said first and second surfaces, and said coupling head having an opening in said second surface and means for supplying a fluid thereto, said openings in said first and second surfaces being in fluid communication when said first and second surfaces are sealingly engaged.