Machining Tool Body Damping Using a Spring-Like Central Tube
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Solution Overview
Problem
Existing machining tools face challenges in accurately damping vibrations due to the limitations of elastomer rings, which have low spring constants, restrict shape and dimension options, and are not suitable for high temperatures, leading to inefficiencies and material aging issues.
Innovation Solution
A tool body with a central tube made of materials like steel or carbon fibre, acting as a resilient element, eliminates the need for elastomer rings, allowing for higher temperature tolerance and adjustable spring constants, enabling a wider range of damping frequencies through varying diameter and wall thickness, and incorporating a bridging element to adjust the spring constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomer rings are used as resilient elements, then the damping apparatus can be manufactured, but the spring constant is low and damping frequency is limited
Solution Approach 1:
The patent changes the material parameter from elastomer to steel or carbon fiber, and adjusts geometric parameters (diameter, wall thickness) of the central tube to achieve desired spring constants and damping frequencies, resolving the limitation of fixed low damping frequency
Solution Approach 2:
The patent uses composite construction by combining the central tube made of steel or carbon fiber with the damper mass body, creating a resilient element with superior mechanical properties including higher spring constant and temperature resistance
2Ease of manufacture
If elastomer rings are used as resilient elements, then the damping apparatus can be assembled, but the material cannot withstand high temperatures and ages over time
Solution Approach 1:
The patent replaces the aging elastomer material with steel or carbon fiber central tube that does not degrade over time or with temperature exposure, eliminating the reliability issues of material aging
Solution Approach 2:
The use of steel or carbon fiber materials in the central tube provides high temperature resistance and eliminates the thermal limitations of elastomer rings
3Reliability
If the central tube is made with adjustable diameter and wall thickness, then the spring constant can be optimized, but the device complexity increases
Solution Approach 1:
The patent optimizes the spring constant by adjusting the diameter and wall thickness parameters of the central tube, allowing customization for different machining tool requirements while maintaining a simple overall structure
4Reliability
If rigid connection of central tube to tool body is implemented, then the resilient element can function effectively, but the shape and dimension options are restricted
Solution Approach 1:
The patent achieves both rigid connection for functionality and shape flexibility by varying the diameter and wall thickness parameters of the central tube, allowing customization for different tool body configurations
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
This solution provides enhanced damping capabilities, allowing for higher damping frequencies and improved temperature resistance, while avoiding material aging issues, resulting in improved machining accuracy and tool longevity.
Implementation Method 1
the central tube of a material with a spring property allowing the damper mass body to oscillate in the internal room perpendicularly to the longitudinal extension of the central tube
Implementation Method 2
A tool body (2) including a damping apparatus (6) for damping vibrations in a machining tool (1)
Data Source
Figure 1~2
Figure 3~4
AI summary
A tool body (2) includes a damping apparatus for damping vibrations in a machining tool having besides the tool body a member with at least one cutting edge to be secured to the tool body. The damping apparatus is arranged in an internal room (7) of the tool body and comprises a damper mass body (9) with an axial bore (10) and a central tube (11) extending through the bore and which is rigidly secured to the damper mass body inside the through bore. A central tube (11) is also at both ends (12, 13) thereof rigidly connected to a tool body fixed part (14, 15) and the central tube is made of a material with a spring property allowing the damper mass body (9) to oscillate in the internal room (7) perpendicularly to the longitudinal extension of the central tube.