Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert

A tool shank for use with a cutting insert in a rotary cutting tool, the tool shank comprising:

• a body having, and adapted to be rotated about, a central longitudinal tool axis, the body having a tip portion structured to receive at least a portion of the cutting insert therein;
• a pair of chip flutes formed in the body;
• and
• a pair of recesses, each recess bordering a respective chip flute, each recess having:
• a rim portion extending perpendicular to the tool axis, and
• a bearing surface extending at an incline relative to the tool axis,
• wherein each rim portion is adapted to engage a corresponding surface on the cutting insert,
• wherein each bearing surface is adapted to engage a corresponding bearing surface on the cutting insert in a manner such that the cutting insert is pulled against the body when the rotary cutting tool is rotated about the tool axis, and
• wherein each recess further comprises a supplemental bearing surface inclined relative to the tool axis opposite the respective bearing surface, wherein each supplemental bearing surface is adapted to engage a corresponding supplemental bearing surface on the cutting insert.

A tool shank for use with a cutting insert in a rotary cutting tool, the tool shank comprising:

• a body having, and adapted to be rotated about, a central longitudinal tool axis, the body having a tip portion structured to receive at least a portion of the cutting insert therein;
• a pair of chip flutes formed in the body;
• and
• a pair of recesses, each recess bordering a respective chip flute, each recess having:
• a rim portion extending perpendicular to the tool axis, and
• a bearing surface extending at an incline relative to the tool axis,
• wherein each rim portion is adapted to engage a corresponding surface on the cutting insert,
• wherein each bearing surface is adapted to engage a corresponding bearing surface on the cutting insert in a manner such that the cutting insert is pulled against the body when the rotary cutting tool is rotated about the tool axis, and
• wherein each bearing surface is inclined at an angle of at least 15° and at most 60° with respect to the tool axis.