| 摘要 |
A boring bar assembly comprises a shank portion and a detachable head portion supported thereon for rotary movement. The head portion may carry one or more removable cutting tool inserts for machining. The head portion is pinned in a fixed position on the shank portion by a shear pin. Excessive pressure in machining causes the pin to shear and allows the head portion to rotate on the shank portion and move away from the surface being machined, thus reducing tool breakage and damage to the parts being machined. An axially offset fluid passageway extends longitudinally through both the shank and head portions to direct liquid coolant onto the cutting tool surface. The axial offset of the passageway does not weaken the boring bar in flexure as much as an axial passageway.
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