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Countersink gage to avoid flaking during countersinking in CFRP

IP.com Disclosure Number: IPCOM000240116D
Publication Date: 2015-Jan-04
Document File: 1 page(s) / 101K

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The IP.com Prior Art Database

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09794: IP.COM

Abstract

This idea concerns drilling of CFRP, especially a countersinking for installation of fasteners. It can be used to avoid flaking during manual countersinking on CFRP parts.

At the moment a countersink gage is used for manual countersink operation but this system is missing a special part which presses down the CFRP fibres in the final diameter of the rivet/fastener head to avoid flaking during the cutting operation. In the standard countersink gages there is a free space between the countersink cutter and the gage, as well as the diameter of the countersink cutter is normally 2-3 mm bigger than the rivet head diameter.

A special part on the standard countersink gage and a special countersink cutters in the size of the final rivet/fastener head are used in this idea. The special plastic part is used to press down the fibers in the range of the final rivet head during the cutting process to avoid flaking in this area. This process produces less repair work and reduces the concessions of the failure “flaking during countersinking”.

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Countersink gage to avoid flaking during countersinking in CFRP

This idea concerns drilling of CFRP, especially a countersinking for installation of fasteners. It can be used to avoid flaking during manual countersinking on CFRP parts.

At the moment a countersink gage is used for manual countersink operation but this system is missing a special part which presses down the CFRP fibres in the final diameter of the rivet/fastener head to avoid flaking during the cutting operation. In the standard countersink gages there is a free space between the countersink cutter and the gage, as well as the diameter of the countersink cutter is normally 2-3 mm bigger than the rivet head diameter.

A special part on the standard countersink gage and a special countersink cutters in the size of the final rivet/fastener head are used in this idea. The special plastic part is used to press down the fibers in the range of the final rivet head during the cutting process to avoid flaking in this area.

This process produces less repair work and reduces the concessions of the failure "flaking during countersinking".