Cutters – for shaping – With means to apply fluid to cutting tool
Reexamination Certificate
2000-05-30
2001-11-06
Tsai, Henry (Department: 3722)
Cutters, for shaping
With means to apply fluid to cutting tool
C407S004000, C407S006000, C407S064000
Reexamination Certificate
active
06312199
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to a tool for metal cutting, said tool comprising a main body having a first part, one or several cutting means being detachably mountable on said first part, and an axially opposite second part of the male type, said second part being applicable in a seat in a clamping unit, through which a cooling medium for said cutting means may be fed, via a channel, to at least one nozzle, through which the cooling medium is allowed to be ejected in a direction towards said cutting means.
PRIOR ART
Tools of the type defined above are often used in machining centres, e.g. multi-purpose lathes for turning/milling. Depending on their function such tools may be equipped with widely different cutting means, i.e. inserts, milling cutters, drills, parting tools, etc. In connection with most tools the two axially opposite parts of the main body of the tool are spaced from each other via a radially projecting, flange ring that constitutes an integral part of the tool body, said first part carrying one or several cutting means may have a widely varied shape depending on the field of use. The second male type part is intended to be fastened in a mating seat in a clamping unit of the machine in question, said part being in the shape of a sleeve having an internal cavity that emerges at the free end of the male part, cooling medium, normally liquid, may be fed to the tool through said cavity. Said sleeve shaped male part has generally conical or tapering shape in order to be distinctly wedged up in a seat in the clamping unit, said seat having a corresponding shape, and that the clamping is effected by means of a mechanism incorporated in the clamping unit, said mechanism being able to on one hand internally gripping the male part and on the other hand pulling said male part into the seat to a firmly wedged position. Although tools having genuine conical male parts (i.e. male parts having circular cross-section) exist in practice male parts of the type CAPTO are preferred, said parts having a polygonal, essentially triangular cross-section that guarantees the tool to automatically have a correct position as regards the angle of rotation relative to the clamping units (said unit including a seat having corresponding polygonal shape).
Cooling of the cutting means of previously known tools is effected by a cooling liquid or other medium being fed to the cavity in the male part, said liquid or medium then being fed to a nozzle, via a smaller channel, and then ejected in a direction towards the cutting means. The cooling liquid is fed from a feeding device located centrally in the clamping unit in axial direction into the cavity of the male part. The pressure of the cooling liquid that is fed into the cavity is limited due to the fact that the liquid applies an axial force upon the tool, said axial force striving to detach the tool from the clamping unit. In practice the allowed liquid pressure is at most within the interval 50-70 bar. If a tool should be detached due to excessive pressures the machined workpiece may be damaged and destroyed; this being especially disastrous in connection with expensive workpieces.
Within modern engineering industry the materials of the workpieces in question are more frequently hard to machine, e.g. blanks for manufacturing of engine blocks. For this reason a definite need exists to increase the cooling liquid pressure on one hand to effectively cool the cutting means and on the other hand to properly remove chips from the workpiece. However, it has not been possible to increase the liquid pressure in connection with previously known tools due to the fact that the cooling liquid then would apply too high axial forces upon the tool.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at overcoming the shortages mentioned above in connection with previously known tools and to create an improved tool. A basic object of the invention is thus to create a tool through which cooling liquid or cooling medium may be fed at extra ordinary pressure up to the nozzles in question. In a certain aspect the invention aims at creating a tool by the aid of which high pressure cooling liquid and low pressure cooling liquid, if needed, may be ejected alternately towards the cutting means. It is also an object to create a tool that is able to receive high pressure cooling liquid without giving rise to liquid leakage problems.
According to the invention at least the primary object of the invention is realised by an arrangement in which cooling fluid is transferred radially to the tool.
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Sjödén Astrid Ingrid Margaretha
Sjödén Eva Karin Margaretha
Sjödén Johan
Sjödén-Nygrén Anna Maria Birgitta
Burns Doane Swecker & Mathis L.L.P.
Sandvik Aktiebolag
Tsai Henry
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