Tool Holder Locking Structure to Prevent Axial Tool Pullout
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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
Incorporating a pullout preventer with locking elements and grooves, featuring a ball head profile, which engages through form locking to securely fasten the tool within the chuck, preventing axial migration and ensuring torque-proof retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a shrink fit chuck is used to clamp the tool, then torque-proof retention is achieved, but axial migration occurs due to vibrations during machining
Solution Approach 1:
The retention mechanism is divided into two independent functional components: the shrink fit chuck provides torque-proof radial retention, while the separate pullout preventer with locking elements and grooves provides axial position stability. This segmentation allows each component to specialize in one function without compromising the other.
Solution Approach 2:
The pullout preventer acts as an intermediary component between the chuck body and the tool. It includes locking elements that engage with corresponding grooves in the tool, creating a form-locking connection that prevents axial migration while allowing the shrink fit chuck to maintain its torque-retention function.
2Ease of operation
If the locking groove width is increased to facilitate easier insertion, then ease of operation improves, but the precision of axial positioning may be compromised
Solution Approach 1:
The locking groove is designed with a tapered or widened entrance section that gradually transitions to a narrower precision-section. This dynamic geometry allows the locking element to easily enter the groove during insertion, then guide itself into the precise final position where axial positioning accuracy is achieved.
Solution Approach 2:
The enlarged entrance portion of the locking groove performs the preliminary action of facilitating easy insertion and self-alignment of the locking element. Once the locking element is seated in the groove, the precise axial positioning is then established by the narrower, more accurate portion of the groove geometry.
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 migration of tools, maintaining precision and safety by ensuring the tool remains securely locked within the chuck during operation, reducing scrap and accident risks.
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
Implementation Method 2
When the inner diameter is enlarged, a tool to be clamped is inserted into the shrink fit chuck, wherein the ratio of the inner diameter of the shrink fit chuck to the shaft diameter of the tool is configured, so that the tool is clamped torque proof in the shrink fit chuck after subsequent cooling of the shrink fit chuck
Implementation Method 3
The coil assembly is connected to a high frequency AC generator and induces Eddy currents in the metal sleeve section, which heat the sleeve section
Implementation Method 4
induces Eddy currents in the metal sleeve section, which heat the sleeve section
Data Source
AI summary
A tool holder comprising a base element, a deformable receiver for clamping a tool and at least one locking element configured for preventing an axial extraction of the tool from the tool holder through engaging a corresponding opposite element at the tool, wherein the at least one locking element is integrally configured in one piece with the receiver.