Drilling Collet Bead Stop for High-Thrust Positioning Accuracy
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Solution Overview
Problem
Existing drilling tools in the aeronautical field face challenges in applying significant thrust forces without moving relative to the part being drilled, and they lack the ability to compensate for deformation of the part or tooling during drilling, leading to reduced precision and control over the drilling force.
Innovation Solution
A drilling assembly with a hollow nose piece and a clamp having an elastic front blocking part with a radially projecting bead, which moves from a retracted to a deployed position along the hollow nose piece's external guide surface, allowing controlled advancement and compensation for relative movements between the tooling and the part being drilled, ensuring precise positioning and force control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the drilling tool uses friction between the elastic locking part and the internal wall of the guide hole to achieve translational stop, then the tool can be positioned relative to the workpiece, but significant pushing force cannot be applied without causing the tool to move
Solution Approach 1:
Instead of using friction between the locking part and the guide hole wall to prevent movement, the invention inverts the approach by using a bead that actively pushes against the distal wall of the guide hole. This reverse mechanism transforms the passive friction-based stop into an active mechanical stop that can withstand significant drilling forces while maintaining positioning accuracy.
2Reliability
If the clamping collet is fixed in its final position to ensure radial expansion of the elastic locking part, then translational stop is achieved, but the ability to compensate for relative displacement or surface deformation is lost
Solution Approach 1:
The invention applies dynamics by making the clamping collet movable relative to the hollow nose piece even after the bead contacts the distal wall. This allows the system to transition from a static fixed position to a dynamic adjustable position, enabling compensation for relative displacements and surface deformations while maintaining the translational stop function through the bead-wall contact.
3Stability of the object's composition
If the drilling tool is designed with a rigid structure to maintain positioning, then stability is improved, but the ability to compensate for deformation during drilling is reduced
Solution Approach 1:
The invention segments the drilling tool into movable and fixed components. The clamping collet is made movable relative to the hollow nose piece, allowing it to compensate for deformations, while the bead-protrusion assembly provides a stable reference point against the distal wall. This segmentation enables both stability and adaptability to coexist.
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 enables reliable stopping of the drilling tool during operation, maintains precise positioning and force control even under significant drilling forces, and allows for adjustment of the drilling force and tool positioning to compensate for part deformation, thereby improving drilling precision and accuracy.
Implementation Method 1
the elastic locking front portion, including a radially outwardly projecting bead, is radially expanded in an elastic manner outwards
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
Drilling tool (1) intended to cooperate with tooling (10) comprising at least one guide orifice (11), comprising: - a hollow nose piece (2) through which a drilling member is intended to pass, - a collet chuck (3), mounted in a sliding manner on the hollow nose piece (2), the sliding of the collet chuck (3) towards the rear along the hollow nose piece (2) causing it to expand radially outwards. The distal end (E31) of the collet chuck (3) comprises a bead (33) protruding radially outwards, configured to stop the movement in translation of the drilling tool (1) with respect to the tooling (10) by bearing against a wall of the tooling (10) surrounding said guide orifice (11), when the collet chuck (3) is expanded radially outwards.