Thin-Walled Workpiece Fixture With Interlaced Damper
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Solution Overview
Problem
Conventional fixtures for thin-walled workpieces are inadequate in damping multi-dimensional vibrations during machining, as they typically target only a single vibration mode and fail to maintain a steady-state machining process due to limited damping capabilities.
Innovation Solution
A fixture with two clamping devices, each comprising a metal carrier with a stair portion and a damper featuring an inclined surface and interlaced elastic and metal layers, providing a multi-mode damping solution by aligning the slope of the damper with the maximum shearing stress angle to effectively dampen various vibration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spring-based shock absorber is used to damp vibrations, then a single vibration mode can be dampened, but multiple vibration modes cannot be effectively controlled
Solution Approach 1:
The patent transitions from a single-direction spring damper to a multi-layer laminated structure with inclined surfaces. The damper comprises alternating elastic layers and metal layers arranged in a stacked configuration, where each layer is inclined at a specific angle. This multi-dimensional layered structure enables the damper to address multiple vibration modes simultaneously by providing damping forces in various directions, rather than only along a single axis.
Solution Approach 2:
The patent employs a composite laminated structure consisting of elastic layers and metal layers bonded together. The elastic layers provide damping properties while the metal layers provide structural support. This composite construction allows the damper to exhibit complex mechanical behavior that can counteract multiple vibration modes, overcoming the limitation of single-material spring dampers that can only address one vibration mode effectively.
2Reliability
If a conventional fixture damps vibration in a unique direction, then that specific direction is controlled, but three-dimensional mode shapes cannot be fully restrained
Solution Approach 1:
The patent introduces inclined surfaces and layered structures that extend damping capability from a single direction to three-dimensional space. The damper layers are arranged at specific inclinations, and the stacked configuration creates multiple planes of damping action. This enables the fixture to restrain vibrations occurring in various directions and mode shapes, not just along one axis, thereby achieving comprehensive three-dimensional vibration control.
3Productivity
If thin-walled workpiece machining is performed with limited damping, then machining can proceed, but the steady-state domain becomes restricted and machining parameters are extremely limited
Solution Approach 1:
The patent applies vibration damping measures before machining begins by pre-installing the laminated damper structure on the fixture. The damper is positioned and secured in advance, creating a prepared damping system that will actively suppress vibrations during the machining process. This preliminary preparation ensures that when machining commences, the workpiece is already protected against vibrations, allowing for a broader range of machining parameters and maintaining steady-state conditions throughout the operation.
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 fixture significantly reduces vibration amplitudes and enhances machining performance by maintaining a steady-state domain, allowing for more efficient and accurate machining of thin-walled workpieces.
Implementation Method 1
The damping portion has at least two elastic layers and at least one metal layer laminated in an interlacing arrangement. Each of the at least one elastic layer is made of an elastic non-metallic material.
Implementation Method 2
provides an inclined shock-absorbing surface for multi-dimensional vibration modes to damp the corresponding vibrations in machining the thin-walled workpiece
Data Source
AI summary
A fixture for a thin-walled workpiece includes two clamping devices. Each of the clamping devices has a metal carrier and a damper. The metal carrier has a carrying portion and a supporting portion, where the supporting portion has a stair portion having a plane surface and a standing surface with a slope. The damper has a metal clamping portion and a damping portion. One end of the metal clamping portion is formed as an inclined surface. The damping portion has at least two elastic layers and at least one metal layer, which are laminated in an interlacing arrangement with the same slope of the inclined surface. One of the elastic layers is disposed to connect the inclined surface. The end of the metal clamping portion connecting the elastic layer is located on the stair portion, while the opposite end of the metal clamping portion protrudes out of the supporting portion.