Drill Point for One-Shot Drilling of Sandwich Panels
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Solution Overview
Problem
Current drilling technologies for aircraft panels with multilayer sandwich or composite materials are complex, inefficient, and result in inaccurate holes with ovalization, excessive roughness, and burr formation, making it difficult to meet strict aeronautical tolerances and requiring lengthy manual finishing processes.
Innovation Solution
A drill point with specific geometric and sharpening features, made from special-micrograin hard metal, designed for use on numerical control machines, enables one-shot drilling through multiple thicknesses of different materials without ovalization or burr formation, ensuring precise and efficient hole creation with integrated countersink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple specialized drill points are used for different material layers, then drilling capability across heterogeneous materials is improved, but device complexity and production time increase significantly
Solution Approach 1:
The drill point is designed with a universal geometry that can drill through multiple heterogeneous material layers (aluminum, titanium, carbon fiber composites) with a single point, eliminating the need for multiple specialized points. The conical geometry with specific angles and the integrated countersink function enable it to perform multiple drilling operations across different materials without requiring tool changes.
Solution Approach 2:
The drill point combines multiple functions into a single tool: it integrates the drilling function for different material layers with an integrated countersink function. The conical geometry merges the drill point and countersink into one unified structure, allowing both operations to be performed in a single shot without separate tools or steps.
2Adaptability or versatility
If multiple drill points are used for different depths, then material-specific drilling is improved, but manufacturing precision deteriorates due to hole ovalization and non-concentricity
Solution Approach 1:
The single drill point is designed to handle all material layers and depth requirements simultaneously. The integrated countersink geometry ensures that the drilling and countersinking operations are concentric by definition, as they are performed by the same rotating tool in a single operation, eliminating the non-concentricity problem that arises from multiple separate operations.
3Adaptability or versatility
If conventional drilling procedures are used, then material coverage is improved, but production productivity decreases due to multiple steps and manual finishing
Solution Approach 1:
The drill point merges multiple drilling steps into a single operation. The integrated countersink function combines the drilling and countersinking operations that were previously performed separately, reducing the number of tool changes and manual finishing steps. This single-shot drilling approach significantly reduces production time while maintaining adaptability across different materials.
Solution Approach 2:
The drilling operation is performed continuously in a single shot without interruptions for tool changes or manual finishing. The single drill point maintains continuous cutting action through all material layers, eliminating the discontinuous nature of multiple sequential operations and manual intervention steps.
4Productivity
If fast numerical control drilling is used, then production speed is improved, but manufacturing precision deteriorates due to excessive roughness and burr formation
Solution Approach 1:
The integrated countersink geometry is designed to work in conjunction with the drilling operation at high speeds. The countersink portion of the tool provides a finishing action that removes burrs and smooths the hole exit surface while the drill point creates the hole, maintaining surface quality even at high numerical control drilling speeds.
Data Source
AI summary
A drill point (1) for drilling sandwich panels (100), composite materials and similar, comprising a shank (2) for coupling into the chuck a tool apt to drive said point (1) in rotation; a drilling member, integral to the shank, comprising a substantially cylindrical working portion (3), and a cutting head (4), located at the end of the working portion (3), having cutting edges (C); wherein onto the surface of the working portion (3) there are obtained helical flutes (5), spirally arranged about a substantially central longitudinal axis (A-A) of the working portion (3), the flutes (5) ending on a top face (4′) of the cutting head (4), characterized in that the constructive geometry thereof provides a helix angle (ε) with respect to the longitudinal axis (A-A), along which there develop the helical flutes (5), substantially comprised in a range of 30° to 35°.