Cavity Tool Holder Structure for Vibration-Damped Clamping
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Solution Overview
Problem
Conventional tool holders experience vibrations due to reaction forces from cutting edges, leading to reduced machining performance, as existing damping methods often compromise precision or suffer from leakage issues with hydraulic pressure.
Innovation Solution
A tool holder design featuring integrally molded cavities within the clamping section that provide excellent damping properties without the need for external covers or welding, allowing for precise control of hydraulic pressure and improved vibration management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tool holders are used to clamp tools, then the tool can be securely held, but vibrations occur due to reaction forces from cutting edges that excite resonance
Solution Approach 1:
The tool holder incorporates porous damping material within its structure, specifically in the form of cavities filled with viscoelastic material. This porous structure absorbs vibration energy and dampens resonant frequencies caused by cutting forces, reducing harmful vibrations while maintaining structural integrity and tool clamping reliability
Solution Approach 2:
The tool holder uses composite construction combining rigid structural materials with viscoelastic damping materials. The composite structure integrates metal components for strength and clamping force with polymer-based damping material in the cavities, creating a multi-material system that simultaneously provides structural support and vibration damping
2Object-affected harmful factors
If damping material is added to reduce vibrations, then vibration damping improves, but the structural integrity and precision may be compromised
Solution Approach 1:
The damping material is strategically placed in specific cavities within the tool holder structure rather than throughout the entire component. This localized application provides vibration damping in critical areas while maintaining structural rigidity and precision in other regions, ensuring machining accuracy is preserved
Solution Approach 2:
The tool holder is segmented into distinct functional zones: rigid structural sections for precision and strength, and cavity regions filled with damping material for vibration control. This segmentation allows each zone to optimize its specific function without compromising the overall system performance
3Force
If hydraulic pressure is used for clamping, then clamping force is improved, but leakage issues occur under high pressure
Solution Approach 1:
The hydraulic system incorporates self-sealing features where the high pressure itself enhances the sealing action. The pressure-activated sealing mechanism automatically increases sealing force under high pressure conditions, preventing leakage without requiring additional sealing components or active control systems
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 tool holder effectively reduces vibrations, maintains machining precision, and ensures reliable sealing under high hydraulic pressures, enhancing overall system performance.
Implementation Method 1
it has been shown that a cavity that is completely enclosed and formed entirely within a pre-formed section exhibits excellent damping properties
Implementation Method 2
This sleeve section of the tool holder can be expanded radially by heating to such an extent that the cold shank of the tool can be inserted into or withdrawn from the sleeve section
Implementation Method 3
Once the sleeve section has cooled down again, a press fit forms between it and the shank of the tool
Data Source
Figure 1~2
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Figure 7~9
AI summary
A tool holder (1) has a main body (2) for coupling the tool holder (1) to the spindle of a machine-tool and a clamping section (3) connected thereto for clamping a tool, and is characterised in that the tool holder (1) has at least one section shaped in a single piece by primary shaping and having one or more inner cavities (9) that form an enclave in the section shaped by primary shaping.