Damper With Broken Surfaces For Foam Damping
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Solution Overview
Problem
Existing damping apparatuses for machine tools and tool holders struggle to effectively adapt to increased length-to-diameter ratios, leading to reduced dynamic stiffness and requiring lower spring constants or greater mass in the damping body, while also failing to utilize foaming to achieve good damping with small forces and prevent sticking due to suction.
Innovation Solution
A damper design featuring a damping body with broken surfaces to promote foam formation in a fluid mixture of liquid and gas, including axial and transversal holes, grooves, and recesses, which creates air pockets for elasticity and prevents sticking by allowing gas to be drawn into the damping fluid from both ends of the damping body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length-to-diameter ratio of tool holders is increased, then the reach and working range are improved, but the dynamic stiffness is reduced
Solution Approach 1:
The patent changes the physical state and composition parameters of the damping fluid by incorporating gas bubbles in addition to liquid, creating a two-phase damping system. This allows the damping apparatus to maintain effective damping performance with adapted parameters suitable for long overhang tools with increased length-to-diameter ratios
Solution Approach 2:
The damping fluid is designed as a composite system combining liquid and gas phases. The gas bubbles dispersed in the liquid create a composite damping medium that provides both viscous damping from the liquid and compressibility from the gas, enabling effective damping in tools with high length-to-diameter ratios
2Adaptability or versatility
If resilient elements with lower spring constant or greater mass are used, then the damping frequency is reduced to adapt to increased length-to-diameter ratios, but the device complexity and mass increase
Solution Approach 1:
Instead of changing the mechanical structure with different spring constants or masses, the patent changes the physical parameters of the damping fluid itself by adding gas bubbles. This allows frequency adaptation through fluid composition rather than structural modification, simplifying the overall device design
Solution Approach 2:
The patent employs pneumatic principles by introducing gas bubbles into the liquid damping fluid. The compressibility of the gas phase provides the necessary frequency adaptation without requiring complex mechanical spring elements or mass adjustments
3Strength
If high viscosity oil is used for damping, then the damping performance is improved, but the damping body may stick due to suction in the adjoining cavity
Solution Approach 1:
The patent changes the physical state of the damping medium by incorporating gas bubbles, which reduces the effective viscosity and prevents the damping body from sticking to the cavity wall while maintaining damping effectiveness
Solution Approach 2:
The damping fluid acts as a porous-like medium with dispersed gas bubbles that allow the damping body to move freely without sticking. The gas-liquid mixture creates micro-channels and reduces surface adhesion, preventing suction-related sticking
4Use of energy by moving object
If small forces are applied for damping, then the energy consumption is reduced, but the damping effectiveness is insufficient without foaming
Solution Approach 1:
The patent utilizes the phase transition and interaction between liquid and gas phases. The gas bubbles in the liquid damping fluid provide compressibility and enhance the damping effect, allowing small forces to achieve effective damping through the phase-change characteristics of the two-phase medium
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 design enhances damping performance by combining high viscosity oil with gas pockets, maintaining effective damping with small forces and preventing the damping body from sticking, thus improving dynamic stiffness and vibration reduction in machine tools.
Implementation Method 1
The damping fluid includes a portion of liquid and a portion of gas and at least one of the cavity surfaces or the damping body surface is broken to effect the foam formation in the damper fluid when in use
Implementation Method 2
promotes a mixing of gas and liquid such that it is formed bubbles or foam in the liquid
Implementation Method 3
at least one of the cavity surfaces or the damping body surface is broken to effect the foam formation in the damper fluid when in use
Implementation Method 4
prevent that the damping body sticks due to suction in the adjoining cavity
Data Source
Figure 1~7
Figure 8~13
Figure 14~15
AI summary
The present invention concerns a damper for damping vibrations. The damper includes at least one substantially longitudinal damping body (1) with two end surfaces (21, 22) and one substantially longitudinal surface (20) between these. The damping body (1) includes a longitudinal direction (a) and a transversal direction (t) and is places in a substantially longitudinal cavity (15) with a damping fluid, wherein the cavity (15) defines at least one cavity surface (14) and the damping body (1) defines at least one damping surface. The damping fluid includes a proportion of liquid and a proportion of gas and either the cavity surface (14) or the damping body surface or both are broken to promote formation of foam in the damping fluid in operation.