Surface Texture Measuring Apparatus Calibration Using Spherical Reference
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Solution Overview
Problem
Conventional surface texture measuring apparatus calibration methods require extensive measurement ranges for stylus length (H) calibration, leading to interference issues and inability to calibrate arm length (L) accurately, resulting in reduced correction accuracy and increased manufacturing costs.
Innovation Solution
A method that calibrates parameters L and H using a surface texture measuring apparatus with a rotary arm, scanning a defined surface in multiple directions, correcting measurement data, and adjusting parameters until roundness or straightness meets predetermined values, allowing for single-round measurement calibration without the need for wide measurement ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement range is widened to calibrate parameter H, then calibration accuracy improves, but arm interference increases making calibration difficult
Solution Approach 1:
The patent introduces a spherical calibration object as an intermediary medium between the measurement apparatus and the calibration process. This spherical object provides a well-defined geometric reference that enables accurate parameter H calibration without requiring the arm to access difficult-to-reach areas, thus avoiding arm interference while maintaining calibration accuracy
Solution Approach 2:
The patent transforms the calibration approach by changing from direct surface measurement to spherical geometry measurement. By measuring a spherical calibration object, the system can calculate parameter H using spherical coordinate transformations and geometric relationships, achieving accurate calibration without extending the measurement range into interference-prone zones
2Ease of manufacture
If parameter L is fixed at nominal value, then manufacturing cost decreases, but correction accuracy reduces
Solution Approach 1:
The patent implements a feedback-based calibration process where parameter L is initially set to the nominal value, then refined through iterative measurement and correction using the spherical calibration object. The system measures the spherical object, calculates the deviation from the nominal parameter L, and adjusts the parameter to achieve accurate correction, thereby maintaining both ease of manufacture and high correction accuracy
Solution Approach 2:
The patent applies preliminary action by pre-setting parameter L to its nominal value during manufacturing, which simplifies the manufacturing process and reduces costs. Subsequently, a calibration step is performed using the spherical calibration object to fine-tune parameter L, ensuring that the initial simplification does not compromise the final correction accuracy
3Manufacturing precision
If batch calibration method is used, then parameter calibration is systematic, but calibration time increases due to multiple measurement requirements
Solution Approach 1:
The patent merges the calibration of multiple parameters (parameter H and parameter L) into a single unified process by using one spherical calibration object. Instead of requiring separate calibration procedures for different parameters, the spherical object provides a comprehensive reference that enables simultaneous determination of both parameters, thereby maintaining systematic calibration while significantly reducing calibration time
Data Source
AI summary
A method for calibrating parameters includes a measurement step that obtains measurement data by scanning a defined surface; a correction step that obtains corrected data by correcting the measurement data based on the parameters; a determination step that calculates a roundness of the corrected data and determines whether the calculated roundness is equal to or less than a predetermined value; and an adjustment step that increases or reduces at least one of the parameters when the roundness is determined to be greater than the predetermined value, and the correction step, the determination step, and the adjustment step are repeated until the roundness is determined to be equal to or less than the predetermined value.