SPADE BLADE DRILL AND METHOD OF MAKING

摘要

A spade blade drill having blended open notch forms on either side of an apex. The notches transition into elliptical flutes which extend outwardly toward sides of the insert. The elliptical flute profiles inhibit chip curling and packing. The sides incorporate a pair of surfaces having a reduced clearance angle for preventing chip packing. The blended open notches are deep and extend across the entire width of the flutes, enhancing heat transfer surface area and allowing chips to flow along the entire flute surfaces. A plurality of chip splatters extend from the flutes across two relief surfaces. The chip splatters have a rounded profile, inhibiting chips from becoming hung in the splatters.