Monolithic Aircraft Door Forging With Cellular Internal Frame
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current aircraft door manufacturing processes are complex, expensive, and result in heavy doors with high production rejects due to numerous operations and critical mechanical connections, which can lead to increased mass and reduced fuel efficiency.
Innovation Solution
A method involving a monolithic structure with a forged blank of stampable metal alloy, stamped between dies to create a cellular structure, and subsequent machining to form a recessed internal frame, reducing the number of operations and enhancing mechanical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aircraft doors are manufactured by assembling many separate parts with fasteners, then safety criteria can be met through rigorous monitoring of each part, but the manufacturing process becomes long, expensive, and the door mass increases
Solution Approach 1:
The patent merges multiple separate parts (outer skin, inner frame, reinforcing elements, locking mechanisms) into a single monolithic forged structure. This eliminates the need for assembly operations with fasteners, reducing manufacturing time and cost while maintaining safety through continuous material structure without weak joints
Solution Approach 2:
The monolithic forged door integrates multiple functions into a single component: structural support, reinforcement, locking mechanism housing, and sealing surfaces. This multi-functional design eliminates the need for separate parts and assembly operations, directly resolving the contradiction between reliability and productivity
2Reliability
If aircraft doors are manufactured by assembling many separate parts with fasteners, then each part can be controlled and monitored rigorously, but the door mass increases due to dimensional requirements at fixings
Solution Approach 1:
By combining all door components into a single monolithic forged piece, the patent eliminates fixing holes and fasteners that create stress concentrations and require excessive dimensional margins. The continuous material structure removes the need for additional mass at connection points, directly reducing door weight while maintaining safety
Solution Approach 2:
The patent introduces a honeycomb internal structure within the monolithic forged door. This porous-like cellular structure reduces overall mass while maintaining structural strength and rigidity, eliminating the need for excessive material at fixing locations and directly addressing the weight issue
3Reliability
If conventional assembly methods with fasteners are used, then safety criteria are met, but the manufacturing process requires demanding positioning and wedging means
Solution Approach 1:
The monolithic forged construction eliminates all fastener connections, positioning requirements, and wedging operations. The door is produced as a single integrated component through forging, completely removing the complex positioning and assembly infrastructure needed for conventional multi-part construction while maintaining safety
4Reliability
If conventional assembly methods with fasteners are used, then safety criteria are met, but the large number of fastener operations increases production reject rate
Solution Approach 1:
By producing the door as a single monolithic forged component, the patent eliminates all fastener installation operations (drilling, countersinking, riveting, bolting). This removes the multiple opportunities for non-conformity at each fastening operation, dramatically reducing production reject rate while maintaining safety through the inherent strength of the forged structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process results in lighter, more rigid aircraft doors with improved static and fatigue resistance, reducing mass and production costs while allowing for precise modulation of mechanical properties.
Implementation Method 1
forging the forged blank between a substantially smooth lower die and an upper die defining cells... obtaining a forged part with a honeycomb structure
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Method for manufacturing an aircraft door having a monolithic structure, comprising the following steps: - producing a forged blank (7); - die-cutting the forged blank (7) between a substantially smooth lower die (8) and an upper die (9) defining cells, and producing a die-cut part with a cellular structure having an open face and a face closed by a wall; - machining the internal walls of the cellular structure to define at least one recess delimited by a web connecting the closed face and the open face and by a base projecting substantially perpendicular to the web, on the open face of the die-cut part.