Clamping Chuck Pullout Prevention Using Ball-Head Locking Grooves
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Solution Overview
Problem
Tool holders with clamping chucks experience axial migration of rotating tools due to vibrations during machining, leading to precision issues and safety hazards, as the tools can become loose or even exit the chuck.
Innovation Solution
Incorporation of a pullout preventer with locking elements and grooves, featuring a ball head profile, which engages upon tool insertion and provides a torque-proof, axially fixed connection, preventing migration through a form-locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clamping chuck is used to hold rotating tools, then the tool can be securely clamped torque-proof, but axial migration of the tool occurs during operation due to vibrations
Solution Approach 1:
The locking mechanism is segmented into multiple independent locking elements (at least two locking elements) distributed around the circumference, each engaging with corresponding locking grooves. This segmentation provides multiple discrete points of axial restraint, preventing tool migration while maintaining torque-proof clamping through the distributed locking architecture.
Solution Approach 2:
The locking elements are nested within the chuck body, with locking grooves formed in recesses that receive the locking elements. The tool shaft contains corresponding grooves that engage these nested locking elements, creating a hierarchical nested structure where the locking mechanism is integrated within the chuck rather than adding external complexity.
2Stability of the object's composition
If locking elements and grooves are added to prevent axial migration, then axial stability is improved, but the device complexity increases
Solution Approach 1:
The locking elements are merged with the chuck body as integral components, and the locking grooves are formed directly in the chuck structure rather than being separate parts. This merging eliminates the need for additional separate locking components, reducing assembly complexity while providing effective axial stabilization through the integrated locking geometry.
Solution Approach 2:
The locking elements serve multiple functions: they prevent axial migration of the tool, provide torque transmission paths, and can be designed to facilitate tool insertion through their geometric configuration. This multi-functionality reduces the need for separate dedicated components for each function, simplifying the overall device structure.
3Ease of operation
If the locking grooves are made wider to facilitate easier insertion, then the ease of operation improves, but the precision of the locking engagement may be reduced
Solution Approach 1:
The locking grooves are configured with varying widths along their length, creating a dynamic engagement profile. The grooves are wider at the insertion end to guide and accommodate the locking elements during tool insertion, then taper or narrow toward the locking end to provide precise engagement and prevent axial migration. This dynamic geometric transition balances ease of insertion with precise locking.
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
Ensures precise machining by preventing axial migration of tools, reducing scrap and accident risks, while maintaining tool security within the chuck during operation.
Implementation Method 1
They are being used for clamping tubular tools, turning tools, milling tools, reaming tools, and grinding tools, and similar through a thermally induced shrink process. Typically, such shrink fit chucks are thermally heated by an inductive shrink system, whereby the inner diameter of the shrink fit chuck is expanded.
Implementation Method 2
the inner diameter of the shrink fit chuck is expanded
Implementation Method 3
In order to avoid scatter flux and to concentrate the magnetic flux, magnetic flux concentration elements made of soft magnetic electrically substantially non-conductive material, like e.g. ferrite or similar, are disposed at the faces and at the outer circumference of the coil assembly, which direct the magnetic flux generated by the coil assembly to the sleeve section of the tool holder
Data Source
AI summary
The invention relates to a tool holder with a tool holding fixture, in particular a clamping chuck such as a contracting chuck, a draw-in collect chuck, a hydraulic expanding chuck and a high-precision chuck, and a shank of a tool, in particular a rotary tool, accommodated in it, wherein the tool holder contains a means for preventing the tool from being pulled out, locking it against axial displacement. This pull-out preventing unit comprises at least one locking element and at least one locking groove, which corresponds to the said locking element, receives it and interacts with it in a positively locking manner. In this case, both the locking element and the locking groove are formed at least partly in the manner of a ball head. Preferably, the tool has the locking grooves. On account of preferably spirally arranged locking grooves along the cylindrical shank of rotary tools, the direction of pitch of which grooves corresponds to the direction of the grooves of the tool, axial locking of the tool is obtained, so that the tool cannot be axially displaced from the tool holder during operation. In addition, force-exerting elements are arranged, with the effect of making the tool lie against the pull-out preventer without play after shrink-fitting.