Self-Resilient Tool Clamping Sleeve for Corrosion-Free Precision
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Solution Overview
Problem
Machine tools, such as dental milling machines, require precise and durable clamping solutions for various tools with different diameters, shapes, and lengths, but existing beryllium copper clamping sleeves are prone to corrosion and high maintenance costs.
Innovation Solution
A clamping sleeve design featuring a self-resilient spreading element and radially inward clamping elements with a compression spring, allowing for precise positioning and easy removal, replacing the need for expensive materials like beryllium copper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If beryllium copper clamping sleeves are used, then dimensional stability and longevity are improved, but corrosion resistance deteriorates due to verdigris formation
Solution Approach 1:
The patent replaces expensive, corrosion-prone beryllium copper clamping sleeves with inexpensive, corrosion-resistant plastic clamping sleeves. The plastic sleeves are designed as disposable components that can be easily replaced when worn, eliminating the corrosion problem while maintaining functionality through cost-effective material substitution.
Solution Approach 2:
The patent fundamentally changes the material parameter from metal (beryllium copper) to plastic, transforming the chemical and physical properties of the clamping sleeve. This material parameter change provides inherent corrosion resistance while the design compensates for any dimensional stability concerns through precise geometric design and tolerances.
2Reliability
If high holding force is applied to counteract accelerations, then tool security is improved, but tool removal difficulty increases
Solution Approach 1:
The patent segments the clamping function into two distinct phases: during acceleration, the friction between the tool and the self-resilient clamping sleeve provides secure holding; during removal, the tool can be easily extracted by overcoming the relatively weak friction force. The segmented design allows the same friction-based mechanism to serve both securing and easy removal functions.
Solution Approach 2:
The self-resilient clamping sleeve dynamically adjusts its clamping force based on operational conditions. During acceleration, the elastic deformation of the sleeve provides increased holding force; during removal, the force naturally decreases, allowing easy tool extraction. This dynamic behavior resolves the contradiction between secure holding and easy removal.
3Manufacturing precision
If precise positioning accuracy of 0.1 to 0.2 mm is required, then tool clamping precision is improved, but manufacturing complexity increases
Solution Approach 1:
The self-resilient clamping sleeve automatically compensates for minor positioning variations through its elastic deformation capability. When the tool is inserted, the sleeve self-adjusts to accommodate small misalignments within the 0.1 to 0.2 mm tolerance range, eliminating the need for complex precision mounting mechanisms or extensive manual adjustment procedures.
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 provides long service life under high alternating loads, maintains precision, and reduces maintenance costs while ensuring safe and defined tool positioning and easy replacement, achieving comparable durability and accuracy without the need for expensive materials.
Implementation Method 1
a resilient spreading element (34) arranged at a rear end (30) of the clamping sleeve (14)
Implementation Method 2
Each collet is then received in a recess and holds the tool by friction
Data Source
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AI summary
The invention relates to a clamping device (10) for a tool (18) on a machine tool with a holder block (12) having at least two, in particular a plurality of, recesses (16) for receiving collets (14), wherein at least two collets (14) are received in the recesses (16). Each collet (12) has a clamping element (36) with which a tool (18), in particular a shank (20) of a tool (18), can be clamped. The collet (14) has the recess (16) in the holder block (12) at least partially passing through it and, at its end opposite the clamping element (36), the rear end, has a spreading element (34) which engages behind the holder block (12) or a counter support element (30) of the holder block (12).