Cup-Shaped Ring Gear Clamping With Integrated Vibration Damping
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Solution Overview
Problem
During the production of gear teeth for internally-toothed ring gears, machining forces cause oscillations that can damage tools and result in undesirable marks on the tooth flanks, affecting manufacturing accuracy and quality.
Innovation Solution
A cup-shaped workpiece clamping device with a damping system comprising an oscillating mass, damping elements, and spring elements arranged outside the clamping area, which absorbs machining-induced oscillations by not bearing on the spindle shaft, allowing for improved damping of interfering frequencies and maintaining tool movement freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional clamping device is used, then the structure is simple, but oscillations occur during machining causing tool damage and quality marks
Solution Approach 1:
The damping device is nested within the cup-shaped clamping device structure. The oscillating mass is positioned inside the cup-shaped body, with damping elements and spring elements arranged in a compact nested configuration, allowing the damping function to be integrated without significantly increasing external dimensions or structural complexity.
Solution Approach 2:
The damping device introduces dynamic elements (spring elements and oscillating mass) to a previously static clamping device. The spring elements provide dynamic response to machining forces, allowing the system to adapt to oscillations in real-time, thereby improving machining reliability without requiring a completely complex redesign.
2Reliability
If damping elements are placed inside the clamping area, then damping effect is maximized, but tool movement is restricted
Solution Approach 1:
The damping device is positioned in the radial dimension outside the opening, rather than occupying the axial space within the clamping area. This dimensional relocation allows the oscillating mass to be placed where it can effectively dampen vibrations transmitted through the cup-shaped body without interfering with the tool's axial movement into the clamping area.
Solution Approach 2:
The cup-shaped body acts as an intermediary structure that transmits damping forces from the oscillating mass to the workpiece. The damping device dampens vibrations in the cup-shaped body itself, which then reduces oscillations transmitted to the workpiece and tool interface, indirectly achieving damping without direct interference with tool movement.
3Strength
If the damping device bears on the spindle shaft, then structural support is improved, but oscillation damping is reduced
Solution Approach 1:
The damping device is extracted from any connection to the spindle shaft and is supported solely by the cup-shaped clamping device. This separation ensures that the damping device does not bear loads from the spindle shaft, allowing it to function purely as an oscillation-damping element without compromised performance.
Solution Approach 2:
The system is segmented into independent functional components: the spindle shaft for driving, the cup-shaped clamping device for workpiece holding, and the damping device for vibration control. Each component performs its specific function independently, with the damping device receiving support only from the clamping device structure, not from the spindle shaft.
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 damping device effectively reduces oscillations, enhancing the quality of gear teeth by minimizing measurable deviations and visual imperfections, thereby improving manufacturing accuracy and customer satisfaction.
Implementation Method 1
spring elements
Implementation Method 2
damping elements
Data Source
AI summary
A spindle arrangement for a machine tool, having a spindle shaft, having a workpiece clamping device for accommodating and clamping an internally-toothed ring gear, wherein the workpiece clamping device is designed as cup-shaped and has a circumferential collar, wherein the circumferential collar delimits an opening for accommodating and clamping an internally-toothed ring gear. The workpiece clamping device further includes a damping device, which has an oscillating mass, damping elements, and spring elements, wherein the oscillating mass, the damping elements, in the spring elements are arranged outside the opening in the area of an outer side of the collar facing away from the opening.