# US 2014/0190231 A1 · Wing panel and aircraft main wing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190231 A1 - Document ID: US20140190231A1 - Status: Published application - Kind: A1 - Application number: 14/160,852 - Filed: 2014-01-22 - Published: 2014-07-10 - Earliest claimed: 2011-02-21 - Assignees: Mitsubishi Aircraft Corporation - Applicants: Mitsubishi Aircraft Corporation - Inventors: Hideto Motohashi; Yoshifumi Hosokawa; Toshinari Fujii - Web page: https://patentgrep.com/patent/US20140190231A1 ## CPC - B21D 31/06: Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming (forging hammers B21J7/00) - B64C 1/12: Construction or attachment of skin panels - B64C 3/182: {Stringers, longerons} - B64F 5/10: Manufacturing or assembling aircraft, e.g. jigs therefor - Y02T 50/10: Drag reduction - B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F) - B64C: AEROPLANES; HELICOPTERS - B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract There is provided a wing panel having improved formability at the time when the wing panel is curvedly formed by the peen forming method, and an aircraft main wing provided with the said wing panel. For a stringer member 20, a base part 21 is formed, and the neutral axis position N in the cross-sectional direction is located on the wing panel 11 side from the center position C in the height direction of a web part 22. When the peen forming method is carried out by projecting metal shots to a portion near a flange part 23 in the tip end portion of the stringer member 20, the tensile strain developing in the portion near a flange part 23 acts in a state in which the moment length around the neutral axis position N is kept long. ## Claims ### Claim 1 Method for producing a wing panel having a rib, comprising: forming the rib such that a width-extended part extending along an inner surface of the wing panel and a web part rising from the width-expanded part in a direction perpendicular to the inner surface of the wing panel are formed integrally; and peen-forming the wing panel by projecting metal shots to a tip end portion of the web part so as to deform the wing panel curvedly so that the inner surface is convex in a span-wise direction of the wing panel, wherein a neutral axis position of the rib in a cross section perpendicular to the span-wise direction of the wing is located on the wing panel side from the center in the height direction from the wing panel of the rib. ### Claim 2 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the width-expanded part is of a plate shape. ### Claim 3 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the thickness of the width-expanded part in the rib rising direction is larger than the thickness of the rib on the tip end portion side. ### Claim 4 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the web part is formed so that the thickness thereof increases gradually from the tip end portion to a base end portion of the web part. ### Claim 5 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the rib is continuous along the span-wise direction of the wing panel. ### Claim 6 (depends on 5) Method for producing a wing panel having a rib according to claim 5, wherein by collision of the metal shots, the rib is deformed so as to stretch in a spanwise direction of the wing. ### Claim 7 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein a flange part bent to the direction perpendicular to the web part in the tip end portion of the web part is formed integrally with the width-expanded part and the web part. ### Claim 8 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein a thickness of the width-expanded part is equal to a thickness of the web part. ### Claim 9 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein a thickness of the width-expanded part is larger than a thickness of the web part. ### Claim 10 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the rib is formed by being machined out of a metallic base material that constitutes the wing panel. ### Claim 11 (depends on 1) Method for producing a wing panel having a rib according to claim 1, wherein the rib is formed so that the thickness thereof increases gradually from the tip end portion to the base end portion of the rib.