Polygonal Cone Tool Holder Interface for Quick Tool Changes
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Solution Overview
Problem
Existing tool holder systems for machining workpieces require complex constructions and large sizes for quick-change functionality, leading to accessibility issues and inefficient tool changes, especially in small machine tool systems.
Innovation Solution
A tool holder system with a tool holder interface featuring a transverse plane surface, a polygonal cone section, and a cylinder section that engages with a corresponding holder shaft interface, allowing for precise relative positioning and quick tool changes without the need for recalibration, using a milling process to ensure accurate alignment and leakproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If axial clamping by means of a screw oriented coaxially with the longitudinal axis is used to enable quick-change functionality, then tool changes can be performed quickly, but the holder shaft becomes very large overall and requires an elaborate construction inside
Solution Approach 1:
Instead of orienting the clamping screw coaxially with the longitudinal axis (conventional approach), the invention inverts the approach by using a clamping screw that acts radially or at an angle, with the clamping action applied perpendicular to the conventional axial direction. This inversion allows the clamping mechanism to be more compact and eliminates the need for elaborate internal construction while maintaining quick-change functionality.
2Productivity
If conventional quick-change systems are used, then tool changes can be performed quickly, but the systems are particularly suitable only for large workpieces and not for small machine tool systems
Solution Approach 1:
The invention changes the geometric parameters of the clamping mechanism, specifically the orientation and position of the clamping screw relative to the holder shaft axis. By modifying these parameters, the system achieves compact dimensions suitable for small machine tools while preserving the quick-change capability that enables high productivity.
3Manufacturing precision
If plane surfaces are used for connection between tool holder and holder shaft, then alignment can be achieved, but additional sealing measures are required to ensure leakproofness for coolant transport
Solution Approach 1:
The invention merges the alignment function and sealing function into a single integrated conical interface design. The conical surfaces provide both precise alignment through their geometric self-centering property and inherent sealing through the continuous contact surface, eliminating the need for separate sealing components and reducing overall device complexity.
Data Source
AI summary
Tool holder for a tool for machining workpieces, with a tool holder body, which defines a longitudinal axis, on which a tool mount for securing a tool is formed and on which a tool holder interface for fixating the tool holder to a holder shaft is formed, wherein the tool holder interface comprises: a tool holder plane surface oriented transversely to the longitudinal axis, against which a holder shaft plane surface can abut to establish a defined relative position in longitudinal direction between the tool mount and the holder shaft, a tool holder cone section, which is polygonal in a cross-section and which can engage with a correspondingly polygonal holder shaft cone section to establish a defined relative position in tangential direction between the tool mount and the holder shaft, and a tool holder cylinder section which can act together with a corresponding holder shaft cylinder section.