Milling Cutter Toolholder Coupling for Rigid Quick-Change Fixing
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Solution Overview
Problem
Existing tool and toolholder coupling systems for milling cutters and shredders are not designed to provide a stable and durable coupling between the tool and the toolholder, leading to unstable and non-rigid connections, which can result in tool displacement, increased wear, and potential breakages due to the application of high workloads and opposing forces.
Innovation Solution
A tool and toolholder system with a cylindrical body and through hole configuration, where the tool's lower face and rear face are placed on the toolholder's corresponding faces, and a screw is inserted through both to secure them, minimizing surface discontinuities and ensuring a stable, rigid connection while allowing easy removal and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single screw is used to couple the tool to the toolholder, then the maintenance and replacement operations are simple and quick, but the coupling is not rigid and stable, causing tool displacement during operation
Solution Approach 1:
The single screw coupling is segmented into multiple screws (typically two or more) distributed around the tool axis. This segmentation provides multiple fixing points that collectively maintain tool stability during operation while still allowing quick removal by unscrewing all fasteners.
Solution Approach 2:
Multiple fixing functions are merged into a standardized multi-screw coupling system with integrated features such as inclined planes for tensioning, recesses for screw head reception, and coordinated geometry that provides both stability and ease of maintenance through a unified structure.
2Stability of the object's composition
If inclined planes are used to mount the tool under tension, then tool displacement is avoided, but the screw is subject to wear from direct contact with milled material and higher stress
Solution Approach 1:
The screw acts as an intermediary that creates indirect tensioning through the inclined planes rather than direct contact between the screw and milled material. The inclined planes transmit the tensile force while protecting the screw from direct exposure to abrasive materials.
Solution Approach 2:
The inclined plane geometry is designed to distribute and cushion the tensile forces before they reach the screw, reducing peak stresses and preventing sudden overload failures. The geometry provides a gradual force distribution that protects the screw thread engagement.
3Reliability
If the screw is screwed directly into a threaded blind hole in the tool, then the screw is protected from direct contact with material, but the tool is subject to forces that tend to provoke removal of the tool from the toolholder
Solution Approach 1:
The inclined planes are positioned and oriented to generate counteracting forces that balance the tensile forces trying to remove the tool from the toolholder. The geometry creates a force equilibrium where the inclined plane reaction forces counterweight the extraction forces during operation.
4Ease of operation
If through holes or blind holes are formed in the tool and toolholder, then the screw coupling is enabled, but surface discontinuities are created that could give rise to breaking cracks
Solution Approach 1:
The holes are positioned and sized in advance during design to minimize disruption to the structural integrity of the tool and toolholder. The geometry is optimized beforehand to avoid stress concentration zones that would predispose the components to cracking under operational loads.
Data Source
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AI summary
The invention concerns a tool (10; 20) and a toolholder (30; 40) comprising coupling means that permit a quick and easy assembly or disassembly of the two elements and ensure, at the same time, a stable and safe fixing during the use of the tool itself.