Elastic Spindle Tilting for Surface Grinding Precision
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Solution Overview
Problem
Existing two-sided surface grinding machines using the through-feed grinding method face issues with axial displacements of grinding stones due to grinding loads, leading to defects in workpieces and wear in grinding stones, as these machines cannot fully prevent axial displacements and tilting of grinding stones results in inconsistent processing precision.
Innovation Solution
The implementation of elastic holding means that tiltably hold grinding stones around axes crossing the direction of exit and entrance, ensuring that axial and exit displacements due to offset loads are substantially equal, maintaining consistent exit displacements throughout processing and reducing wear by resetting the grinding stones before the end of processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If grinding stones are rigidly fixed to withstand grinding loads, then structural strength is improved, but axial displacements occur during continuous processing causing thickness variations in workpieces
Solution Approach 1:
The grinding stone is made tiltably movable around a tilt axis through elastic holding means, allowing it to dynamically adjust its position in response to grinding loads. This dynamic capability enables the grinding stone to maintain optimal contact with the workpiece surface throughout the grinding process, preventing thickness variations while accommodating the forces applied during grinding.
Solution Approach 2:
The elastic holding means changes the mechanical parameters of the grinding stone fixation system by introducing controlled elasticity. This allows the grinding stone to undergo controlled tilting and positional adjustments within elastic limits, transforming the rigid fixation into a flexible connection that maintains both strength and precision during operation.
2Adaptability or versatility
If grinding stones are allowed to tilt freely to follow workpiece surfaces, then adaptability is improved, but axial displacements occur causing exit displacements and processing defects
Solution Approach 1:
The invention converts the harmful effect of grinding loads causing axial displacements into a beneficial mechanism. The elastic holding means and tilt axis arrangement are designed so that the axial displacement produced by the grinding load is transformed into a controlled tilting motion around the tilt axis. This controlled tilting allows the grinding stone to follow the workpiece surface while maintaining consistent exit displacement, turning the harmful load effect into a useful adaptive mechanism.
Solution Approach 2:
The elastic holding means acts as an intermediary element between the rigid spindle structure and the grinding stone. It mediates the interaction by allowing controlled tilting and displacement while maintaining the necessary mechanical connection. This intermediary mechanism filters out the harmful axial displacement effects while preserving the beneficial adaptability to workpiece surfaces.
3Adaptability or versatility
If grinding stones are made floatable in all directions to follow workpiece surfaces, then adaptability is improved, but the number of defectively ground articles increases due to uncontrolled displacements
Solution Approach 1:
The freedom of motion is segmented into controlled degrees of freedom. The grinding stone is allowed to tilt only around a specific tilt axis rather than floating freely in all directions. This segmentation of motion freedom maintains adaptability to workpiece surfaces while preventing uncontrolled displacements that would lead to processing defects, thereby improving reliability.
4Manufacturing precision
If elastic holding means are introduced to control axial displacements, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The elastic holding means introduces dynamic capability to the spindle unit, allowing the grinding stone to tilt and adjust its position automatically in response to grinding loads. This dynamic feature achieves precise control of axial and exit displacements without requiring complex active control systems, thereby improving manufacturing precision with minimal added complexity.
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 approach reduces the number of defectively ground articles and minimizes wear on grinding stones by maintaining constant exit displacements and controlled entrance displacements, enhancing processing precision and extending the life of grinding stones.
Implementation Method 1
elastic holding means for holding the grinding stones tiltably around tilt axes crossing the direction of exit and entrance of said workpieces with respect to the grinding stones
Data Source
AI summary
In through-feed grinding workpieces by grinding stones rotating around the axes of spindles, the spindles are tiltably held by elastic holding means around tilt axes substantially orthogonal to the direction of exit and entrance of the workpieces with respect to the grinding stones. When a grinding loads are imposed on the entrance sides of the grinding stones, the spindles are tilted by offset loads around the tilt axes against the force of urging means in such a manner that the axial displacement and the exit displacement of the grinding stone due to the offset load are substantially the same. The grinding stones are reset around the tilt axes by the elastic holding means immediately before the end of processing at which time the axial displacement is smaller. This makes it possible to reduce the number of defectively ground articles coming from the through-feed grinding and reduce the wear in the grinding stones.