PCD drill for composite materials
AssigneePrecorp, Inc.
InventorsRichard M. Garrick, John A. Bunting
Life of this patent
Estimating the term…
Abstract
A PCD drill for producing close tolerance holes in multi layer laminates, such as carbon fiber reinforced composites, with minimum fraying of the fibers on both entrance and exit from the hole is provided. The drills provided include a symmetrical cutting point with a self-centering split point and a high shear second cutting lip positioned at the outer diameter of the drill. The drills of the invention may allow for increased cutting speeds and feeds when used with such advanced composite materials, thus increasing tool productivity and providing increased performance.
Claims36
A drill for producing holes in composite materials comprising:
- an elongate, tungsten carbide drill body including a helical flute and a polycrystalline diamond cutting tip, the cutting tip further comprising:
- a center point coaxial with a longitudinal axis of the drill body;
- a primary cutting lip extending from the center point toward an outer diameter of the drill body, the primary cutting lip extends from the center point toward the outer diameter at an angle of from about 45° to about 75° relative to the longitudinal axis of the drill body;
- and
- a shear cutting lip extending from the primary cutting lip to the outer diameter of the drill body, the shear cutting lip having a positive rake face angle intersecting with a positive primary relief angle and being oriented at an angle of less than or equal to about 15° relative to the longitudinal axis of the drill body to create a sharp shearing edge.
A drill for producing holes in composite materials comprising:
- an elongate, tungsten carbide drill body including a pair of symmetrical helical flutes and a polycrystalline diamond cutting tip, wherein the cutting tip comprises:
- a center point coaxial with a longitudinal axis of the drill body;
- a pair of primary cutting lips extending from the center point toward an outer diameter of the drill body, the primary cutting lip extends from the center point toward the outer diameter at an angle of from about 45° to about 75° relative to the longitudinal axis of the drill body;
- and
- a pair of symmetrical shear cutting lips having a positive rake face angle intersecting with a positive primary relief angle and being oriented at an angle of less than or equal to about 15° relative to the longitudinal axis of the drill body to create a sharp shearing edge.
A drill for producing holes in composite materials comprising:
- an elongate, tungsten carbide drill body including a pair of symmetrical helical flutes and a polycrystalline diamond cutting tip, wherein the cutting tip comprises:
- a center point coaxial with a longitudinal axis of the drill body formed by the intersection of a pair of symmetrical central cutting lips extending from the longitudinal axis toward an outer diameter of the drill body at an angle of from about 45° to about 75° relative to the longitudinal axis;
- a pair of primary cutting lips extending from the central cutting lips toward an outer diameter of the drill body at an angle of from about 45° to about 75° relative to the longitudinal axis;
- and
- a pair of symmetrical shear cutting lips extending from the primary cutting lips to the outer diameter, each of the lips having a positive rake face angle intersecting with a positive primary relief angle and being oriented at an angle of less than about 15° relative to the longitudinal axis of the drill body to create a sharp shearing edge.
Dependencies are inferred from the claim text.