Strip Feed Roller Thickness Measurement With Contamination Correction
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Solution Overview
Problem
Existing strip thickness measurement systems using rollers are inaccurate due to contamination, which is not effectively addressed by frequent cleaning, especially when measuring coated strips.
Innovation Solution
A method involving a roller arrangement with two rollers that can move relative to each other, allowing for the determination of reference parameters and continuous correction of thickness measurements by accounting for roller diameter changes caused by contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If roller-based thickness measurement is used, then the measurement system is simple and cost-effective, but measurement precision deteriorates due to roller contamination from strip coatings
Solution Approach 1:
The system performs preliminary action by determining reference parameters (reference roller positions and reference rotation angles) during an initial reference feed operation with clean rollers. These reference values are stored and used for subsequent correction during production, allowing the system to maintain precision without frequent cleaning interruptions
Solution Approach 2:
The system implements feedback by continuously monitoring actual roller positions and rotation angles during feed operations, comparing them against the stored reference parameters, and calculating correction values. This feedback mechanism automatically compensates for roller contamination effects, maintaining measurement precision without requiring manual intervention or frequent cleaning
2Measurement precision
If frequent roller cleaning is performed to maintain measurement accuracy, then measurement precision is maintained, but productivity decreases due to production interruptions
Solution Approach 1:
The system performs preliminary action by establishing reference parameters during an initial clean state. This preliminary calibration allows the system to operate for extended periods without cleaning, as the reference values enable continuous correction of measurements despite roller contamination accumulating over time
Solution Approach 2:
The system implements self-service by automatically detecting roller contamination effects through position and rotation angle deviations, then self-correcting the thickness measurements using the stored reference parameters. This eliminates the need for manual cleaning interventions, maintaining both precision and productivity
3Device complexity
If roller diameter changes due to contamination are not corrected, then device complexity remains low, but manufacturing precision deteriorates in punched products
Solution Approach 1:
The system uses feedback by continuously monitoring deviations in roller positions and rotation angles from their reference values. These deviations indicate roller diameter changes due to contamination, and the system automatically calculates correction values that are applied to thickness measurements, ensuring punched product precision without increasing device complexity
Solution Approach 2:
The system applies parameter changes by adjusting the thickness measurement calculations based on detected roller diameter variations. When roller contamination causes diameter changes, the system modifies the measurement parameters using correction values derived from position and rotation angle deviations, maintaining manufacturing precision
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
Achieves accurate strip thickness measurement by continuously correcting for roller diameter deviations, maintaining precision without the need for frequent cleaning.
Implementation Method 1
The material strip is clamped between two rollers which can be moved parallel and relative to one another perpendicular to their axes of rotation towards and away from one another
Data Source
AI summary
A method for determining the thickness of a material strip (5) when feeding the material strip (5) to the processing zone of a machine tool (1). The material strip (5) is clamped between two rotatable rollers (3, 4), whose relative position to each other in the original state with clean rollers and “zero” roller spacing was detected (reference relative position) and whose relative position to each other in the intended feed operation is determined for each feed interval (current relative position). The difference between the current relative position and the reference relative position, which gives the thickness of the strip material (5) when the rollers are clean in their original state, is corrected according to the invention for any changes in diameter of the rollers (3, 4) that may have occurred, for example, due to contamination. For this purpose, in the original state with clean rollers (3, 4) in a reference feed operation, an assigned reference angle of rotation of the roller (3) is additionally detected for at least one of the rollers (3) at a detected reference feed length, so that the original ratio of feed length/angle of rotation for this roller (3) is known and thus its original diameter is also clearly defined. If there are deviations from these parameters during the intended feed operation, the deviations are converted into a diameter change of the at least one roller (3) and taken into account in the calculation of the thickness of the material strip (5). The invention makes it possible to solve today's problems in strip thickness measurements with rollers.