Grinding Apparatus Vibration Cancellation via Spindle Positioning
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Solution Overview
Problem
Conventional grinding apparatuses face challenges in reducing chatter on workpieces due to unbalanced grinding wheels, which requires labor-intensive manual balancing or costly automatic balancers, and often results in insufficient chatter reduction without complex workpiece pressing device configurations.
Innovation Solution
A grinding apparatus and method that utilize vibrational displacement calculation devices to determine and cancel out relative vibrational displacement between the grinding wheel and workpiece, allowing for precise position adjustments of the wheel spindle stock to maintain constant contact and reduce chatter without the need for phase-shifted workpiece pressing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual balance adjustment is performed by attaching balance pieces, then the balance of the grinding wheel can be adjusted, but labor and time are required for the balance adjustment
Solution Approach 1:
The system automatically detects the imbalance of the grinding wheel through vibration measurement and self-adjusts the balance by moving the wheel spindle stock to positions that cancel out the vibrational displacement, eliminating the need for manual balance piece attachment and reducing adjustment time
2Reliability
If automatic balancer is provided, then the balance can be automatically adjusted, but equipment cost increases
Solution Approach 1:
The wheel spindle stock positioning system serves dual purposes: it positions the grinding wheel for grinding operations and simultaneously compensates for imbalance by moving to specific positions that cancel vibration, eliminating the need for separate automatic balancer equipment
Solution Approach 2:
The existing wheel spindle stock positioning mechanism automatically compensates for imbalance using real-time vibration feedback, making the system self-adjusting without requiring additional dedicated balancing equipment
3Object-affected harmful factors
If workpiece pressing devices are disposed in positions shifted in phase by 180 degrees from all grinding points, then chatter can be reduced, but the devices are difficult to dispose in such positions and chatter cannot be sufficiently reduced in some cases
Solution Approach 1:
Instead of adding complex pressing devices at specific positions to counteract vibration, the system inverts the approach by moving the grinding wheel itself to positions that naturally cancel the vibrational displacement, transforming the problem into a solution through the wheel's own positioning capability
Solution Approach 2:
The grinding wheel positioning system automatically compensates for imbalance and reduces chatter by moving to positions that cancel vibrational displacement, eliminating the need for separate workpiece pressing devices configured at specific phases
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 effectively reduces chatter and improves grinding accuracy by enabling automatic adjustment of the grinding wheel position based on real-time vibrational data, eliminating the need for costly equipment and complex workpiece pressing configurations.
Implementation Method 1
a grinding wheel side vibrational displacement calculation device that obtains a vibrational displacement of the grinding wheel resulting from a vibration in an approaching and separating direction of the grinding wheel caused by an imbalance of the grinding wheel about a rotational axis line of the grinding wheel
Implementation Method 2
a main spindle side vibrational displacement calculation device that obtains a vibrational displacement of the workpiece generated by propagation of the vibration in the approaching and separating direction of the grinding wheel from the wheel spindle stock through the bed
Implementation Method 3
a position change unit that creates, based on the obtained relative vibrational displacement between the grinding wheel and the workpiece, a position change command to change a position of the wheel spindle stock
Data Source
AI summary
A grinding apparatus includes grinding wheel side vibrational displacement calculation devices that obtain a vibrational displacement of a grinding wheel resulting from a vibration in an approaching/separating direction of the grinding wheel; main spindle side vibrational displacement calculation devices that obtain a vibrational displacement of a workpiece generated by propagation of the vibration in the approaching/separating direction of the grinding wheel; a relative vibrational displacement calculation unit that obtains a relative vibrational displacement between the grinding wheel and the workpiece based on the vibrational displacement of the grinding wheel and the vibrational displacement of the workpiece that have been obtained; a position change unit that creates, based on the obtained relative vibrational displacement between the grinding wheel and the workpiece, a position change command to change a position of the wheel spindle stock; and a processing controller that grinds the workpiece W based on the created position change command.