Hardness Testing Instrument Calibration via Automatic Height Adjustment
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Solution Overview
Problem
Conventional hardness testing instruments require complex operations and fine adjustments for force calibration across multiple standards, involving manual calculations and repeated alignment of the load cell, which complicates the calibration process and demands higher quality management.
Innovation Solution
A hardness testing instrument with a load applying section, driving section, specimen table height adjustment, indentation depth measurement, deformation amount measurement, and calibration section, which allows for automatic storage and calculation of indentation and deformation data to adjust the specimen table height and calibrate the load by comparing measured values with predetermined loads on reference blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force calibration is performed for three standards in the stroke of the hardness testing instrument, then measurement precision and traceability are improved, but device complexity and operational complexity increase due to required fine adjustments and hand calculations
Solution Approach 1:
The specimen table height adjustment section automatically adjusts the specimen table height based on stored reference data, eliminating the need for manual position adjustments and hand calculations. The system self-calibrates by comparing measured indentation depths with reference values, automatically determining the correct specimen table height for each calibration standard.
Solution Approach 2:
Indentation depth measurements of reference blocks are performed in advance and stored in the indentation depth amount storage section before actual calibration operations. This preliminary measurement allows the system to quickly retrieve and use reference data during calibration, avoiding repeated measurements and manual calculations.
2Measurement precision
If measurement of reference block is performed each time due to individual difference according to model, then measurement precision is improved, but loss of time increases due to repeated measurements
Solution Approach 1:
The system performs and stores indentation depth measurements of reference blocks in advance in the indentation depth amount storage section. These pre-measured reference values are retained for future calibration operations, eliminating the need to repeatedly measure the same reference blocks while maintaining measurement accuracy through stored reference data.
Solution Approach 2:
Instead of repeatedly measuring physical reference blocks, the system creates and stores digital copies of indentation depth measurements in the indentation depth amount storage section. These stored measurement data serve as virtual references that can be repeatedly accessed without physical remeasurement, saving time while preserving measurement accuracy.
3Measurement precision
If alignment of height position of load cell is performed after release of test force, then measurement precision is maintained, but productivity decreases due to repeated alignment operations
Solution Approach 1:
The specimen table height adjustment section automatically restores the specimen table to its reference position after each measurement cycle, eliminating the need for manual realignment operations. The system self-corrects position drift by comparing current position with stored reference position data, maintaining alignment accuracy without requiring repeated manual intervention.
Solution Approach 2:
The system continuously monitors the specimen table position and compares it with the reference position stored in the indentation depth amount storage section. When position deviation is detected, the specimen table height adjustment section receives feedback and automatically adjusts the specimen table height to restore proper alignment, ensuring measurement precision while eliminating manual realignment steps.
Data Source
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AI summary
Disclosed is a hardness testing instrument which measures a hardness of a specimen, the hardness testing instrument including: a load applying section with the indenter or a flat indenter mounted thereon; a driving section to move the load applying section; a specimen table on which an object to be pressed is placed; a specimen table height adjustment section to adjust a height position; an indentation depth amount storage section to measure the indentation depth amount when the indenter is pressed to a reference block and to store the amount; a deformation amount storage section to measure the deformation amount of a load measuring instrument when the flat indenter is pressed to the load measuring instrument and to store the amount; a height position obtaining section to obtain a height position of the specimen table; and a calibration section to calibrate the load.