Drill for machining fiber reinforced composite material

A composite, fiber-reinforced technology used in tools for lathes, metalworking equipment, workpieces, etc.

Inactive Publication Date: 2009-07-15
KENNAMETAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typical defects after drilling with conventional PCD bits include spalling, fiber pull-out, burning and the like, such as Figure 8 shown

Method used

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  • Drill for machining fiber reinforced composite material
  • Drill for machining fiber reinforced composite material
  • Drill for machining fiber reinforced composite material

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Embodiment Construction

[0017] see Figure 1-5 , wherein like reference numerals represent like elements, a double flute, diamond-coated twist drill according to an embodiment of the present invention is indicated generally at 10 prior to cleaving. Preferably, the drill bit 10 is made of a tungsten carbide (WC) matrix having bonded cobalt (Co) in the range of about 3 wt.% to 10 wt.% and a thickness of between 3 μm and 20 μm A diamond coating in the range, which is deposited by chemical vapor deposition (CVD). The sharpening radius (or cutting edge radius) after coating is between about 5 microns and 30 microns.

[0018] Drill bit 10 has a shank 11, a longitudinal axis 12 and includes two flutes 14 and 16 with a helix angle 18 of between about 25 degrees and 35 degrees relative to longitudinal axis 12. A land width 24 is maintained between about 5% and 10% of the drill diameter 22 . A drill body void diameter 26 is maintained between about 92% and 96% of the drill bit diameter 22 . The core thickn...

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Abstract

A diamond coated drill capable of drilling holes in fiber reinforced composite materials. The drill is made from a tungsten carbide (WC) substrate with cemented cobalt (Co) in a range between about 3 to 10 wt. % and a diamond coating having a thickness in a range between 3 to 20 microns. The drill includes a shank, a longitudinal axis and includes two flutes at a helix angle that is in a range between 25 and 35 degrees with respect to the axis. A margin width is maintained between about 5 to 10 percent of the drill diameter. A body clearance diameter is maintained at between about 92 to 96 percent of the drill diameter. A web thickness before splitting is about 20 to 30 percent of the drill diameter. A clearance angle or lip relief angle is between about 10 and 20 degrees. A chisel edge angle is between about 105 and 120 degrees. A chisel edge length is up to about 0.035 mm. A splitting angle is between about 130 and 150 degrees. A notch angle is between about 30 and 40 degrees with respect to the drill axis. A notch rake angle lies between about -5 and 10 degrees. A split point angle is between about 70 and 100 degrees, and preferably about 90 degrees.

Description

Background technique [0001] Carbon fiber reinforced polymers (CFRP) include a wide range of composite materials with different fiber types, fiber orientations, fiber contents, and matrix materials. The use of fiber reinforcements has been growing steadily in many industries in recent years. For example, CFRP composites have found increasing applications in the aerospace and automotive industries due to their high specific strength and high specific stiffness. As the use of such materials increases, there will be an increasing need for a cost-effective method that can produce high quality holes in such materials that are sized within narrow tolerances. [0002] However, CFRP composites pose huge problems in terms of processing. Currently, the market is dominated by polycrystalline diamond (PCD) drill bits. Typical defects after drilling with conventional PCD bits include spalling, fiber pull-out, burning and the like, such as Figure 8 shown. [0003] It has been recognized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/02
CPCB23B2226/31B23B2251/18B23B2251/44B23B2228/10B23B2222/28B23B2251/04B23B51/02B23B2251/14B23B2226/27B23B2226/275Y10T408/9097
Inventor K·桑帕斯倪旺阳
Owner KENNAMETAL INC
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