Inner-Wall Measuring Instrument Offset Calculation
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Solution Overview
Problem
Existing inner-wall measuring instruments face challenges in accurately measuring the surface profile and bore radius of engine cylinders due to limitations in probe selection and offset calculation methods, leading to inaccuracies in measurements.
Innovation Solution
An inner-wall measuring instrument equipped with a touch probe, image probe, rotational drive unit, linear drive unit, and a calculator, allowing for precise imaging and offset calculation between probes, enabling accurate measurement of inner walls by rotating and moving the image probe while calculating offset amounts using calibration jigs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple probes are used for measurement, then measurement capabilities are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple probes (touch probe and image probe) into a single integrated probe holder assembly. The probe selection mechanism allows selective positioning of either the touch probe or image probe to a common measurement position, enabling multiple measurement functions without requiring separate independent probe systems. This merging approach maintains measurement versatility while reducing overall device complexity compared to having completely separate probe systems.
Solution Approach 2:
The probe holder is designed as a universal platform that can accommodate and position different types of probes (touch probe for contact measurement, image probe for non-contact imaging). The common probe selection position and shared mechanical structure allow the same holder to serve multiple measurement functions, making the system multi-functional without proportionally increasing complexity.
2Measurement precision
If offset amount calculation is performed between probes, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The offset amount between the touch probe and image probe is pre-calculated and stored before actual measurement operations. The calibration process establishes these offset values in advance using calibration jigs with known geometries, so that during measurement, the pre-computed offsets are simply applied without requiring complex real-time calculations. This preliminary action improves measurement precision while keeping the operational complexity low.
Solution Approach 2:
Calibration jigs with precisely known geometric features serve as intermediaries to establish the offset relationships between different probes. Instead of directly measuring complex offsets between probes during operation, the system uses these intermediary calibration artifacts with predetermined dimensions to calculate and store offset values, simplifying the overall measurement process while maintaining high precision.
Data Source
AI summary
An inner-wall measuring instrument includes: a placement surface on which an object to be measured is placed; a base relatively movable with respect to the placement surface in three axis directions orthogonal to one another; a touch probe that is disposed at a first position of the base and brought into contact with the object; an image probe that is disposed at a second position of the base and capable of imaging the object with a direction parallel to the placement surface being an imaging direction; a rotational drive unit that rotates the image probe around an axis extending in a direction perpendicular to the placement surface; a linear drive unit that moves the image probe in the imaging direction; and a calculator that calculates an offset amount between the touch probe disposed at the first position and the image probe disposed at the second position.