Grinding Machine Measurement Drift Compensation
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Solution Overview
Problem
In grinding processes, measuring devices experience significant warm-up times due to heat-induced drift, making it challenging to maintain measurement accuracy without prolonged activation periods, and using special materials to mitigate this issue increases manufacturing costs.
Innovation Solution
A measuring method that reduces the activated time of the measuring device relative to the main process time, allowing for frequent activation and deactivation cycles to minimize drift, thereby achieving high accuracy without the need for extensive warm-up periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring device is activated continuously to maintain measurement accuracy, then measurement precision is improved, but warm-up time increases and productivity deteriorates
Solution Approach 1:
The measuring device is activated periodically only during measurement phases rather than continuously. The control unit activates the measuring device at specific intervals corresponding to measurement needs, allowing the device to cool down and reduce drift between activations, thereby maintaining accuracy while reducing warm-up time and improving productivity.
2Measurement precision
If the measuring device is activated for long periods to reduce drift, then measurement precision is improved, but loss of time increases
Solution Approach 1:
A correction value is calculated in advance based on predetermined drift characteristics of the measuring device. This correction value is then applied to measured values to compensate for drift, eliminating the need for prolonged activation to reduce drift naturally, thereby reducing warm-up time while maintaining precision.
Solution Approach 2:
The physical state of the measuring device is changed by controlling its activation periods. Instead of maintaining continuous activation to reduce drift, the device is activated only when needed, and drift compensation is achieved through correction values, changing the operational parameters from continuous to periodic activation.
3Measurement precision
If special materials are used to reduce heat impact, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
Instead of changing the material composition of the measuring device to reduce heat impact, the invention changes the operational parameters by controlling activation periods and applying correction values based on drift characteristics, achieving the same effect at lower manufacturing cost.
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 enables accurate measurements with reduced warm-up time, maintaining desired dimensional accuracy in grinding processes while minimizing the impact of heat-induced drift without increasing manufacturing costs.
Implementation Method 1
the variations being due to heating caused by energization of the sizing device
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
In a measuring method in which a sizing device (10) is activated only for a prescribed measurement time (t1) to carry out measurement in a main process that is repeated with a period of a prescribed process time (t0), there are stored an activation drift that is a drift of a measured value after activation of the sizing device (10) and a deactivation drift that is a fluctuation in drifts among different elapsed times, each of the drift being measured when the sizing device is activated after a predetermined time has elapsed since the sizing device (10) is deactivated. A measurement drift section is determined. In the measurement drift section, the minimum value and the maximum value of the drift in the measurement time (t1) in the activation drift are equal to the minimum value and the maximum value of the drift within a time (t2) obtained by subtracting the measurement time (t1) from the process time (t0) in the deactivation drift, and the difference between maximum value and the minimum value is equal to or smaller than a prescribed value (E). The sizing device (10) is warmed up for a time (tD) corresponding to a time from activation in the activation drift to the time at which the measurement drift section starts, and then the main process is started.