Patent ID: 8827598
Filing Date: 2014-09-09
Classification: B23B,B23D,Y10T

Abstract:
1. A cutting assembly, comprising: a toolholder and a cutting insert; the toolholder having an axial forward end and an axial rearward end, the toolholder having a head portion at the axial forward end and a shank portion at the axial rearward end; the head portion containing a slot separating the head portion into a lower section and an upper section, the lower section defining a lower seat and the upper section adapted to retain the cutting insert therebetween; the head portion having an exit adapted to direct coolant to the cutting insert; the head portion containing a fastener bore; the head portion containing a coolant entrance passage in fluid communication with the fastener bore, and the upper axial forward extension section containing at least a portion of a coolant discharging section having a longitudinal coolant discharge axis; a fastener being received within the fastener bore to clamp the cutting insert in the toolholder and allow coolant to pass therethrough, the fastener having an axial fastener bore with an inlet and an outlet, the axial fastener bore inlet being in fluid communication with the coolant entrance passage and the axial fastener bore outlet being in fluid communication with the fastener bore; the cutting insert includes a pair of cutting portions disposed on either side of a shank portion, each cutting portion including a forward cutting edge and a clearance face extending downwardly from the forward cutting edge, the forward cutting edge being oriented at a lead angle of between 0 degrees and 10 degrees, the cutting insert further including a rake surface extending rearwardly from the forward cutting edge of each cutting portion toward the shank portion to a protuberance extending upwardly in the shank portion, the upwardly extending protuberance engaged by the toolholder to rigidly mount the cutting insert in the head portion of the toolholder, the cutting insert further including a coolant channel formed in the protuberance of the shank portion of the cutting insert adjacent each rake surface, wherein the coolant channel is positioned directly opposite of the exit when the cutting insert is mounted in the toolholder, thereby causing the coolant channel to act as a nozzle to enhance the flow rate of the coolant delivered to an interface between the cutting insert and a workpiece.