Acoustic Drilling Head with Autonomous Cassettes for Depth Control
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Solution Overview
Problem
Current acoustic drilling technologies face challenges in aligning drill bits with non-flat surfaces, managing drill depth, and maintaining drilling heads, leading to inefficiencies, breakage, and high maintenance costs, particularly when dealing with composite acoustic parts.
Innovation Solution
A self-adaptive drilling device featuring a support block with independently adjustable autonomous cassettes, each equipped with a mobile drill support and dynamic inertia balancing mechanism, allowing for precise height adjustment and easy replacement, along with a probing device for automatic depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If matrix drilling is used to improve drilling efficiency, then productivity increases, but the ability to align drill tips parallel to non-flat skin is lost
Solution Approach 1:
The drilling head is divided into multiple independent drilling cassettes (at least two), each capable of autonomous operation. Each cassette can be independently adjusted to accommodate non-flat surfaces while maintaining high drilling throughput through parallel operation of multiple cassettes.
Solution Approach 2:
Each drilling cassette is equipped with movable drill supports that can be independently adjusted along the main axis of the cassette. This dynamic adjustment capability allows each drill tip to be aligned parallel to the local surface orientation on non-flat skins, resolving the alignment issue while maintaining matrix drilling efficiency.
2Productivity
If drill depth is not controlled on non-flat skin, then drilling speed increases, but drill breakage occurs and parts are drilled through
Solution Approach 1:
Each drilling cassette is equipped with a probing device that automatically detects the skin surface position before drilling. This feedback mechanism enables real-time adjustment of drill depth based on actual surface conditions, preventing drill breakage and through-drilling while maintaining high drilling speeds.
Solution Approach 2:
The probing device on each cassette autonomously measures and communicates the skin position to the control system, which then automatically adjusts the drill support position. This self-service capability eliminates the need for manual intervention and ensures consistent drill depth control across varying surface geometries.
3Manufacturing precision
If specialized maintenance teams are used to handle drilling head problems, then drilling precision is maintained, but production time increases and costs rise
Solution Approach 1:
Each drilling cassette is designed as a self-contained, independently replaceable unit. When a cassette becomes defective or worn, it can be quickly removed and replaced by production operators without requiring specialized maintenance teams. This reduces production downtime and maintenance costs while maintaining drilling precision through the use of replacement cassettes.
Solution Approach 2:
The drilling head is segmented into multiple independent cassettes that can be individually maintained or replaced. This modular design allows production operators to perform simple maintenance tasks and replace individual cassettes without affecting the entire drilling head, significantly reducing maintenance time and complexity.
4Reliability
If drills are broken to prevent through-drilling, then drilling safety improves, but time is wasted and new drills must be replaced
Solution Approach 1:
The probing device on each cassette provides automatic feedback on skin position and drill depth, enabling precise control that prevents through-drilling without requiring manual drill breaking. This eliminates the time-wasting breaking operation while maintaining drilling safety and extends drill life.
Solution Approach 2:
The manual mechanical operation of breaking drills is replaced by an automated control system that uses probing feedback to precisely control drill depth. This substitution eliminates the need for dangerous and time-consuming manual drill breaking while maintaining equivalent or superior drilling safety.
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
The solution enhances flexibility and precision in drilling, reduces waste and maintenance costs, and improves the control of acoustic hole diameters, thereby enhancing the acoustic performance of the final parts.
Implementation Method 1
the translational movement mechanism is a ball screw, the ball screw being mounted on the fixed frame of the cassette
Implementation Method 2
each cassette comprises a dynamic inertia balancing mechanism
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Device (1) for drilling an acoustic component, comprising a drilling head (2), the drilling head (2) comprising a support unit (3) comprising at least two autonomous drilling cassettes (5), each one comprising at least one drill bit (8), an armature that is fixed relative to the support unit (3) and a drill bit support that is able to move along the main axis of the cassette between a retracted position and a deployed position, notable in that each drill bit support is equipped with at least one sensor device (7) for sensing the skin of the acoustic component that is to be drilled so as to automatically control the drilling depth of the drill bits of each cassette.