Calibration Device for Cylinder Diameter Gauges
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Solution Overview
Problem
Current measurement gauges for cylinders, particularly in grinding machines, face limitations in accuracy for absolute diameter measurements due to systematic errors from guide straightness, manufacturing errors, and temperature variations, which are not adequately addressed by existing calibration methods.
Innovation Solution
A calibration device with independently movable abutments and optical readers allows precise positioning of gauge arms and sensors to minimize systematic errors by calibrating the measurement system across the entire range, using motors to translate and rotate screws for accurate diameter measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement gauges are used for absolute diameter measurements, then the measurement process is simple and quick, but the accuracy is insufficient due to systematic errors from guide straightness and manufacturing errors
Solution Approach 1:
The patent introduces a calibration device as an intermediary standard with precisely known dimensions. This calibration device mediates between the measurement gauge and the actual workpiece, allowing the gauge to be calibrated against the known standard. The calibration device includes reference surfaces and measurement points with traceable dimensions, serving as a bridge to transfer accuracy from the standard to the gauge without requiring direct measurement of the gauge's systematic errors
Solution Approach 2:
The patent replaces manual mechanical calibration methods with an automated calibration system. The calibration device incorporates automated measurement mechanisms that can systematically evaluate and compensate for guide straightness errors and manufacturing errors through programmed measurement sequences and data processing, eliminating the need for operator skill and manual adjustment
2Measurement precision
If calibration devices are introduced to improve measurement accuracy, then systematic errors are reduced, but the device complexity and setup time increase
Solution Approach 1:
The calibration device is pre-configured with reference surfaces and measurement points that have known, traceable dimensions. The calibration standards are prepared in advance with certified values, allowing the measurement gauge to be quickly calibrated by simply contacting these pre-prepared reference features without requiring time-consuming manual setup or computation of calibration parameters
Solution Approach 2:
The calibration device is designed as a universal standard that can calibrate multiple measurement gauges and measure various geometric parameters (diameters, radii, profiles). The single calibration device serves multiple functions and can be used across different measurement tasks, eliminating the need for separate calibration procedures for each gauge or parameter type
3Measurement precision
If multiple calibration samples are used to cover the entire measurement range, then accuracy across all diameters is improved, but the complexity of the calibration system increases
Solution Approach 1:
The calibration device incorporates multiple reference surfaces and measurement points segmented across different radial positions and heights. Each segment provides calibration reference for specific diameter ranges, allowing the system to cover the entire measurement range through systematic segmentation of the calibration space rather than requiring multiple separate calibration samples
Solution Approach 2:
The calibration device extends calibration references into additional spatial dimensions (radial position, height, angular position) rather than relying solely on multiple separate samples. By creating a multi-dimensional calibration surface with known geometry, the system can calibrate gauges for various diameters by measuring at different positions on the same calibration device, reducing the number of separate calibration artifacts needed
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 solution significantly improves the accuracy of absolute diameter measurements by minimizing systematic errors and maintaining precision across the entire measurement range, even with temperature variations and wear, enhancing the overall performance of the measurement gauges.
Implementation Method 1
Each abutment carries a reader of the known type (also called 'head'), each cooperating with a respective optical line, constrained to the supporting structure
Implementation Method 2
Each abutment is driven, independently of the other abutment, by its own motor, to rotate the respective screws, which are screwed into female screws
Implementation Method 3
The motors rotate the respective screws, which are screwed into female screws, to which the above abutments are operatively constrained
Data Source
AI summary
A calibration device for gauges for the measurement of the geometrical characteristics of cylinders, such as the diameter, profile, rotundity and eccentricity errors, wherein such gauges include a pair of movable opposing arms equipped with feelers or sensors at their free ends, includes a pair of abutments reciprocally approachable and/or withdrawable by means of motors until a sample measure is obtained, as desired, within the measuring range of the gauge, on which the calibration device is assembled, revealed by means of measuring means cooperating with the abutments, such that consequently the feelers or sensors are respectively abutted or approached to the abutments to reveal the sample measure.