Grinding Apparatus Slip Detection via Phase-Linked Resistance Monitoring
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Solution Overview
Problem
Existing grinding apparatuses struggle to reliably determine the occurrence of slip between the workpiece and main spindles, leading to potential defective products due to inconsistent grinding conditions.
Innovation Solution
A grinding apparatus and method that include a first detection unit for rotational phase, a second detection unit for grinding resistance moment or drive current, and a determination unit that compares current and previous rotational phase data to accurately detect slip, allowing for real-time adjustments to prevent product defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant threshold is used for motor current value control, then the control system is simple, but it cannot reliably determine slip occurrence for all workpiece sizes and grinding conditions
Solution Approach 1:
The patent applies dynamics by making the threshold value changeable rather than constant. The threshold is dynamically adjusted based on the detected rotational phase and stored reference values, allowing the control system to adapt to different workpiece sizes and grinding conditions (rough vs. precision grinding) while maintaining reliable slip detection across all scenarios
Solution Approach 2:
The patent implements feedback by storing the grinding resistance moment or drive current at each rotational phase and comparing current values with stored reference values. This feedback mechanism allows the system to learn normal operating patterns and reliably detect slip conditions by identifying deviations from expected behavior, rather than using a fixed threshold
2Reliability
If grinding conditions are set conservatively to prevent slip, then product quality is maintained, but machining time increases due to reduced productivity
Solution Approach 1:
The real-time slip detection system provides immediate feedback when slip occurs, allowing the control to respond dynamically. This enables the system to operate at higher speeds with confidence, knowing that slip will be detected and corrected promptly, rather than requiring consistently conservative grinding conditions that reduce productivity
Solution Approach 2:
The patent replaces mechanical conservative grinding settings with an intelligent detection and control system. Instead of relying on overly conservative mechanical parameters to prevent slip, the system uses sensor-based detection and automated control responses to prevent defective products, allowing for more aggressive and productive grinding parameters
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 solution enables reliable detection of slip, preventing defective products and reducing the safety margin for grinding conditions, thereby shortening machining time by ensuring consistent grinding operations.
Implementation Method 1
a second detection unit that detects a grinding resistance moment at a grinding point between the grinding wheel and the workpiece, or detects a drive current of a rotary drive unit of the workpiece or a rotary drive unit of the grinding wheel
Implementation Method 2
rotation of the centers is transmitted to the workpiece with frictional forces associated with pressing forces of the centers
Data Source
AI summary
A grinding apparatus grinds a workpiece by rotating the workpiece held by main spindles and a grinding wheel held by a wheel spindle, and by relatively moving the grinding wheel toward and away from the workpiece. The grinding apparatus includes a first detection unit that detects a rotational phase of the workpiece; a second detection unit that detects a grinding resistance moment at a grinding point between the grinding wheel and the workpiece, or detects a drive current of a rotary drive unit of the workpiece or a rotary drive unit of the grinding wheel; a storage unit that stores the grinding resistance moment or the drive current in a manner associated with the rotational phase; and a determination unit that determines a slip between the workpiece and the main spindles based on the grinding resistance moment or the drive current at a current rotational phase, and on the grinding resistance moment or the drive current at the same phase as the current rotational phase of a previous time.