Drilling Device for Aircraft Cargo Door Bore Alignment
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Solution Overview
Problem
Existing methods for producing cargo doors in aircraft result in misalignment of bores due to stress introduction during the manufacturing process, leading to difficulties in assembling shafts and axles.
Innovation Solution
A CNC-controlled shaft drilling and spindle system with a receiving device that accounts for the component's stress and weight, allowing for precise alignment and drilling of bores, and includes a pivot axis for stress-free storage and machining, along with a second machining head for independent processing and tolerance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cargo door is manufactured using conventional riveting methods, then the stiffening structure can be assembled, but stress is introduced into the component causing bore misalignment
Solution Approach 1:
The patent applies preliminary action by pre-positioning the stiffening structure onto the outer skin panel before the riveting process begins. This allows the structure to be securely held in place during drilling and riveting operations, preventing movement that would cause bore misalignment. The pre-positioning ensures that all components are correctly aligned before any stress-introducing operations occur.
Solution Approach 2:
The patent introduces a specialized receiving device as an intermediary between the cargo door and the manufacturing process. This device includes support elements that contact specific surfaces of the cargo door to hold it in a predetermined position during drilling and riveting. The receiving device acts as a mediator that absorbs and manages stresses during manufacturing, preventing them from being transferred to the cargo door structure itself.
2Productivity
If the cargo door is removed from the riveting device, then the manufacturing process is complete, but the component warps causing bore offset
Solution Approach 1:
The patent performs preliminary positioning and stress management during the manufacturing process itself. The receiving device is designed to hold the cargo door in its final operational configuration throughout manufacturing, so that when the door is removed from the device, it is already in its correct final position with all bores properly aligned. This eliminates the need for post-manufacturing adjustment or repositioning.
Data Source
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AI summary
The invention relates to a drilling device comprising a receiving unit for receiving a component (20), in particular a freight door, having at least one drill head (72) for introducing at least one bore (58) into the component (20), wherein the receiving unit provides stress-free mounting of the component (20) in the installed position.