Invention Grant
- Patent Title: Method of forming a contoured hat stiffener
-
Application No.: US14795354Application Date: 2015-07-09
-
Publication No.: US10369740B2Publication Date: 2019-08-06
- Inventor: Michael Robert Chapman , Gordon Dale Davis
- Applicant: The Boeing Company
- Applicant Address: US IL Chicago
- Assignee: The Boeing Company
- Current Assignee: The Boeing Company
- Current Assignee Address: US IL Chicago
- Agency: Yee & Associates, P.C.
- Main IPC: B29C51/08
- IPC: B29C51/08 ; B29C51/42 ; B29C70/46 ; B29D99/00 ; B29C70/56 ; B29C51/12 ; B29L31/00 ; B29K105/08 ; B29K105/00 ; B29L9/00

Abstract:
A flexible punch and die are used to form a flat composite laminate charge into a stiffener having a desired cross sectional shape. A desired contour is formed in the stiffener by bending the punch and die. Ply wrinkling is avoided during contouring by maintaining those portions of the stiffener subject to wrinkling in tension as the contouring is being performed. Bridging of the plies during the contouring process is avoided by first contouring those sections of the stiffener that are subject to wrinkling, and then contouring the remaining sections of the stiffener.
Public/Granted literature
- US20170008217A1 Reducing Wrinkling of Contoured Hat Stiffeners Formed from a Single Composite Charge Public/Granted day:2017-01-12
Information query