Chuck Crest Trough Axial Locking Mechanism
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Solution Overview
Problem
Existing chucks fail to securely grip articles under large axial cutting forces, leading to undesirable axial sliding, which can affect the quality of the work-piece and the life of the tool.
Innovation Solution
A chuck design featuring a longitudinally extending through-hole with a crest and trough configuration, allowing the article to slide in the releasing position and be securely locked in the securing position, with a collet and nut mechanism that radially contracts to prevent axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional chuck without axial locking features is used, then the article can be easily inserted and removed, but the article slides axially under large cutting forces
Solution Approach 1:
The chuck is divided into functional segments: a collet body for radial contraction, and a separate locking mechanism with crest and trough features for axial positioning. This segmentation allows the chuck to provide both easy insertion and axial locking without requiring complete structural redesign.
Solution Approach 2:
The crest on the collet and corresponding trough on the article shank act as intermediary locking features. These intermediate elements mediate between the radial gripping action and axial force resistance, preventing axial slippage while maintaining the simplicity of the overall chuck design.
2Force
If radial contraction force is increased to prevent axial sliding, then grip strength improves, but the article may be damaged or deformed
Solution Approach 1:
The gripping function is segmented into two independent mechanisms: radial contraction for grip strength and axial locking for position stability. This allows axial forces to be resisted through the crest-trough interface rather than through excessive radial contraction, preventing article deformation while maintaining secure grip.
Solution Approach 2:
The crest and trough features serve as intermediary elements that transfer axial loads without requiring increased radial gripping force. This intermediary mechanism protects the article from deformation by distributing axial forces through dedicated locking features rather than through the gripping surfaces.
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 effectively prevents axial sliding of the article during cutting operations, ensuring better work-piece quality and tool longevity by securely gripping the article even under significant axial forces.
Implementation Method 1
tightening the nut urges the collet rearwardly into a tapered bore of the chuck, thereby contracting the collet in a radially inward direction
Data Source
AI summary
A chuck and an article are configured such that the article is releasably secured in the chuck. One of the chuck and article is provided with a crest and the other with a trough. When the article is secured to the chuck, the crest enters the trough so as help prevent slippage of one with respect to the other. The chuck may include a receiver having a tapered bore, a collet having a complementarily tapered outer surface, and a nut configured to be threadingly secured to a forward end of the receiver; the article may be a shank, such as a tool shank. An inner surface of the collet may be provided with a crest which is configured to fit into a trough formed on the shank. In a secured position, the shank is accommodated in the bore of the collect with the crest of the collet at least partially occupying the trough of the shank, thereby preventing movement of the shank relative to the collet, which itself is accommodated in the bore of the receiver.