Twist Structure Determination in Cylindrical Workpieces
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Solution Overview
Problem
Existing methods for determining twist structures in cylindrical workpieces are time-consuming and not suitable for mass production, as they require complete data sets from multiple sampling segments for accurate results.
Innovation Solution
A method that uses a preliminary twist structure analysis based on initial sampling segments, with estimated parameter values corrected iteratively as subsequent segments are measured, allowing for rapid recognition and high accuracy in twist structure determination without needing a full data set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete data sets from multiple sampling segments are used for accurate twist structure determination, then measurement precision is improved, but measurement time increases significantly
Solution Approach 1:
The patent applies preliminary action by using the first sampling segment to generate an initial estimated value of the twist structure parameters before completing all measurements. This allows for rapid preliminary assessment and decision-making while the remaining segments are being measured, thereby reducing the time needed for complete analysis without sacrificing final accuracy.
Solution Approach 2:
The patent implements feedback by iteratively correcting the estimated twist structure parameters using measured values from subsequent sampling segments. The initial estimated values are continuously refined and updated as more measurement data becomes available, ensuring that the final result achieves high measurement precision while the process benefits from early preliminary results.
2Measurement precision
If multiple sampling segments are measured to ensure accuracy, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent enables preliminary action by generating initial estimated values from the first sampling segment alone, which can be used for immediate quality assessment and process control decisions. This preliminary results capability allows the measurement system to contribute to productivity by providing actionable information early in the measurement process, while still maintaining the option to achieve higher precision with additional segments if needed.
Solution Approach 2:
The patent applies partial action by allowing the measurement process to be stopped after the first sampling segment when the initial estimated value is sufficient for quality control decisions. This selective completion approach enables the system to achieve adequate measurement precision for many practical applications without requiring all sampling segments, thereby significantly improving productivity in mass production environments.
3Loss of time
If a quick assessment method is used, then measurement time is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying preliminary action through the first sampling segment, which provides sufficient data for rapid initial assessment and quality control decisions. The estimated values generated from this single segment achieve the required measurement precision for practical applications, eliminating the need to measure all segments when quick assessment is the goal.
Solution Approach 2:
The patent implements partial action by enabling the measurement process to be terminated after the first sampling segment when quick assessment is needed. This partial measurement approach provides adequate measurement precision for quality control purposes without the time cost of completing all sampling segments, thereby achieving both speed and sufficient accuracy.
Data Source
AI summary
Method for determining a twist structure in the surface roughness of a workpiece which is cylindrical at least in part includes that multiple sampling segments which extend in the axial direction of the workpiece and which are mutually spaced apart in the circumferential direction are carried out in a surface region of interest on the workpiece, and the value of at least one parameter of the twist structure is determined based on the measured values obtained using the sampling segments. An estimated value of at least one parameter of the twist structure is determined based on the measured values associated with a first sampling segment, the estimated value being corrected based on the measured values associated with at least one second sampling segment.