TWIST DRILL AND METHOD OF DRILLING COMPOSITE MATERIALS, USE AND METHOD REGRINDING AND MANUFACTURING THEREOF Russian patent published in 2016 - IPC B23B51/02 

FIELD: technological processes.

SUBSTANCE: invention relates to machining and may be used for drilling of composite materials. Twist drill comprises a shank, drill body, drill tip including a cutting edge, chisel edge and secondary chisel edge. Secondary chisel angle is 140°-165°. Drill tip has a point angle of 70°-100° and a flute extending from the drill tip to the drill body and having a constant helix angle of 45° to 55°. Method for drilling of composite materials by the said twist drill and method manufacturing thereof are disclosed.

EFFECT: higher quality and tool durability.

15 cl, 1 tbl, 6 dwg