Tool Holder Collet and Insert Centering
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Solution Overview
Problem
Existing tool holders with collet holders suffer from wear and geometry errors when switching between collets and tool inserts, leading to increased radial runout and machining errors, which can damage machine tools and workpieces.
Innovation Solution
A tool holder design featuring a conical borehole for collet clamping and separate centering means for tool inserts, allowing for independent centering and torque transmission, with adjustable taper angles and polygon connections to optimize radial and axial runout and clamping forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tool inserts are received directly in the collet holder, then the versatility of the tool holder is improved, but the wear on the collet holder increases and positioning precision deteriorates
Solution Approach 1:
The invention divides the tool holder into two functionally independent parts: the collet holder and a separate tool insert holder. The tool insert holder includes its own centering means (such as a conical bore or cylindrical bore with positioning elements) that are independent of the collet holder's conical bore. This segmentation allows each component to be optimized for its specific function without compromising the other, thereby maintaining positioning precision while enabling versatility.
Solution Approach 2:
The invention introduces a separate tool insert holder as an intermediary component between the collet holder and the tool insert. This intermediary element provides dedicated centering means for tool inserts, preventing direct contact between the tool insert and the collet holder. This mediator preserves the collet holder from wear while ensuring accurate positioning of tool inserts.
2Device complexity
If the same conical borehole is used for both collets and tool inserts, then the device complexity is reduced, but the service life of the collet holder decreases due to wear
Solution Approach 1:
The invention segments the tool holder system into distinct functional zones: the collet holder for clamping collets and the separate tool insert holder for receiving tool inserts. This physical and functional separation prevents wear from tool insert installation from affecting the collet holder, thereby extending the service life of the collet holder while maintaining reasonable structural complexity.
Solution Approach 2:
The invention extracts the tool insert receiving function from the collet holder by providing a separate tool insert holder with dedicated centering means. This extraction removes the harmful effect of tool insert wear on the collet holder, allowing the collet holder to maintain its service life while still enabling the tool holder to receive both collets and tool inserts.
3Device complexity
If centering means are not provided for tool inserts, then the device complexity is reduced, but the radial runout and machining precision deteriorate
Solution Approach 1:
The invention applies local quality by providing centering means specifically in the tool insert holder where they are needed, rather than throughout the entire tool holder system. The centering means (such as conical or cylindrical bores with positioning elements) are localized to the area where tool inserts are received, providing precise radial runout control only where necessary while minimizing overall device complexity.
Data Source
AI summary
A system is proposed that is made up of a tool holder 1, a collet 15 with a clamping nut 19, and a tool insert 27, in which the collet 15 and the tool insert are fixed and positioned on various function surfaces within the tool holder 1. Nevertheless, the clamping means are the same, namely a thread on the tool holder 1.