Rotary cutter for machining materials

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• wherein a first one of said at least one margin relief portion comprises an eccentric relief portion.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• wherein said rotary cutter further comprises one or more coolant channels in said body, and wherein at least some portion of said one or more coolant channels extends from said lower end of said shank portion to said face portion.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• wherein said at least one margin portion in said flutes comprises a curved relief surface, and wherein said curved relief surface comprises a radial relief surface.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• wherein said at least one margin portion in said flutes comprises a curved relief surface, and wherein said curved relief surface comprises an elliptical relief margin surface.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• wherein said shank comprises a first shank material, and wherein said flutes comprise a first flute material, and wherein said first shank material and said first flute material are securely attached with a mechanical joint therebetween.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• further comprising one or more coolant passageways therethrough, wherein at least one of said one or more coolant passageways is located along a longitudinal centerline of said rotary cutter, whereby a coolant supplied to said rotary cutter enters said shank portion via a central entry port and exits through a central exit port, wherein said central exit port is located at the center of rotation of said face portion of said rotary cutter.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• further comprising one or more coolant passageways therethrough, wherein at least a portion of one of said one or more coolant passageways is located along a longitudinal centerline of said rotary cutter, whereby a coolant supplied to said rotary cutter enters said shank portion via a central entry port and exits through one or more flute exit ports located in one of said flutes.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• further comprising one or more coolant passageways therethrough, wherein at least a portion of one of said one or more coolant passageways is located spaced apart from a longitudinal centerline of said rotary cutter and is generally aligned for feed to a proximal end of flute, whereby a coolant supplied to said rotary cutter enters said shank portion via a plurality of flute entry ports and exits through one or more flute exit ports located in one or more of said flutes.

A rotary cutter for cutting a workpiece, said rotary cutter comprising:

• a body, said body comprising a shank portion having a lower end, and a cutting portion, said cutting portion comprising (a) flutes extending upward along said body from a lower flute end, said flutes comprising a leading edge land portion having a flute cutting edge, and at least one margin relief portion, (b) a face portion, said face portion comprising a plurality of face cutting edge portions, and a downwardly and inwardly sloping first dish portion adjacent each face cutting edge portion, and (c) corner blend portions extending from flute cutting edge to said face cutting edge portions;
• and
• further comprising one or more coolant passageways therethrough, wherein at least a portion of one of said one or more coolant passageways is located spaced apart from a longitudinal centerline of said rotary cutter and is generally aligned for feed to a proximal end of flute, whereby a coolant supplied to said rotary cutter enters said shank portion via a plurality of flute entry ports, and wherein coolant exits through coolant discharge ports located at or near the interior end of said first dish portion of said face portion.