# US 2014/0197569 A1 · Method of fabricating a hole in a composite panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197569 A1 - Document ID: US20140197569A1 - Status: Published application - Kind: A1 - Application number: 13/741,418 - Filed: 2013-01-15 - Published: 2014-07-17 - Earliest claimed: 2013-01-15 - Assignees: GM Global Technology Operations LLC - Applicants: GM Global Technology Operations LLC - Inventors: Joseph M. Polewarczyk; Paul E. Krajewski - Web page: https://patentgrep.com/patent/US20140197569A1 ## CPC - B29C 70/545: {Perforating, cutting or machining during or after moulding} - B29C 2793/0045: Perforating - B29L 2031/06: Rods, e.g. connecting rods {, rails, stakes (shafts B29L2031/75; poles, masts, posts B29L2031/766)} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A method of forming a hole in a composite panel includes positioning a first fiber sheet on a layup table, where the layup table has a forming tool extending outward from a portion of the table, and the fiber sheet includes a plurality of fibers oriented along a first common direction. The method further includes extending the forming tool through the first fiber sheet such that a subset of the plurality of fibers are displaced about the forming tool: applying a resin to the sheet of fibers; pre-curing the resin to form a pre-preg part defining a hole about the forming tool; and removing the pre-preg part from the layup table. ## Claims ### Claim 1 A method of forming a hole in a composite panel comprising: positioning a first fiber sheet on a layup table, the layup table having a forming tool extending outward from a portion of the table, the fiber sheet including a plurality of fibers oriented along a first common direction; extending the forming tool through the first fiber sheet such that a subset of the plurality of fibers are displaced about the forming tool; applying a resin to the sheet of fibers; pre-curing the resin to form a pre-preg part defining a hole about the forming tool; and removing the pre-preg part from the layup table. ### Claim 2 (depends on 1) The method of claim 1, further comprising: inserting the pre-preg part into a part mold; curing the pre-preg part within the part mold. ### Claim 3 (depends on 2) The method of claim 2, wherein curing the pre-preg part within the part mold includes heating and applying pressure to the pre-preg part. ### Claim 4 (depends on 1) The method of claim 1, further comprising: positioning a second fiber sheet on the layup table prior to applying the resin, the second fiber sheet including a second plurality of fibers oriented along a second common direction; and extending the forming tool through the second fiber sheet such that a subset of the second plurality of fibers are displaced about the forming tool. ### Claim 5 (depends on 4) The method of claim 4, wherein the first common direction is not parallel to the second common direction. ### Claim 6 (depends on 1) The method of claim 1, wherein the forming tool includes at least one of a conical portion and a pyramidal portion, and wherein the at least one of a conical portion and a pyramidal portion is configured to pierce through the first fiber sheet. ### Claim 7 (depends on 6) The method of claim 6, wherein the forming tool includes a cylindrical portion between the layup table and the at least one of a conical portion and a pyramidal portion. ### Claim 8 (depends on 1) The method of claim 1, wherein the removed pre-preg part defines a hole formed by the forming tool. ### Claim 9 (depends on 1) The method of claim 1, wherein the step of extending the forming tool through the first sheet of fibers is characterized by not severing any of the plurality of fibers. ### Claim 10 A method of forming a hole in a carbon fiber composite panel comprising: positioning a first carbon fiber sheet on a layup table, the layup table having a forming tool extending outward from a portion of the table, the first carbon fiber sheet including a plurality of carbon fibers oriented along a first common direction; positioning a second carbon fiber sheet on the layup table prior to applying the resin, the second carbon fiber sheet including a second plurality of carbon fibers oriented along a second common direction; and extending the forming tool through the first carbon fiber sheet and the second carbon fiber sheet such that a subset of each of the first plurality of carbon fibers and the second plurality of carbon fibers are displaced about the forming tool; applying a resin to the first and second carbon fiber sheet; pre-curing the resin to form a carbon fiber pre-preg part defining a hole about the forming tool; and removing the carbon fiber pre-preg part from the layup table. ### Claim 11 (depends on 10) The method of claim 10, further comprising: inserting the carbon fiber pre-preg part into a part mold; curing the carbon fiber pre-preg part within the part mold. ### Claim 12 (depends on 11) The method of claim 11, wherein curing the carbon fiber pre-preg part within the part mold includes heating and applying pressure to the carbon fiber pre-preg part. ### Claim 13 (depends on 10) The method of claim 10, wherein the first common direction is not parallel to the second common direction. ### Claim 14 (depends on 10) The method of claim 10, wherein the forming tool includes at least one of a conical portion and a pyramidal portion, and wherein the at least one of a conical portion and a pyramidal portion is configured to pierce through the first carbon fiber sheet and the second carbon fiber sheet. ### Claim 15 (depends on 14) The method of claim 14, wherein the forming tool includes a cylindrical portion between the layup table and the at least one of a conical portion and a pyramidal portion. ### Claim 16 (depends on 10) The method of claim 10, wherein the removed carbon fiber pre-preg part defines a hole formed by the forming tool. ### Claim 17 (depends on 1) The method of claim 1, wherein the step of extending the forming tool through the first and second sheet of fibers is characterized by not severing any of the first and second plurality of carbon fibers.