Force-Controlled Contact Measurement for Dimension and Roughness
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Solution Overview
Problem
Existing measurement systems cannot simultaneously measure the dimension and surface roughness of an object without risking damage to the surface, and they often require separate machines for each measurement, leading to inefficiencies.
Innovation Solution
A measurement system incorporating a contact, hand part, robot arm, force sensor, and control device that allows simultaneous measurement of dimension and surface roughness using a single contact by adjusting the reaction force to a predetermined value, enabling the detection of surface roughness without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measurement machines are used for three-dimensional shape and surface roughness measurement, then measurement specialization is improved, but device complexity and measurement time increase
Solution Approach 1:
The patent combines a three-dimensional coordinate measurement machine and a surface roughness meter into a single integrated measurement system. The surface roughness meter is mounted on the measurement machine so that both three-dimensional shape measurement and surface roughness measurement can be performed simultaneously using the same measurement probe and control system, eliminating the need for separate machines and reducing overall system complexity.
Solution Approach 2:
The measurement system is designed to perform multiple measurement functions through a single integrated platform. The same measurement probe and control system can switch between three-dimensional coordinate measurement mode and surface roughness measurement mode, making the system universal and multi-functional rather than requiring specialized separate devices for each measurement type.
2Productivity
If surface roughness measurement is performed with high contact pressure, then measurement speed is improved, but surface damage risk increases
Solution Approach 1:
The measurement system incorporates a force sensor that provides real-time feedback on the contact force between the measurement probe and the measured object's surface. The control system uses this feedback information to dynamically adjust the probe's contact pressure, ensuring it remains within a safe range that prevents surface damage while maintaining sufficient contact for accurate roughness measurement and adequate measurement speed.
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
Enables simultaneous and efficient measurement of both dimension and surface roughness without damaging the object, improving work efficiency and accuracy in measuring complex surfaces.
Implementation Method 1
a force sensor configured to, when the contact is pressed against the surface of the object to be measured, detect a reaction force from the surface of the object to be measured to the contact
Data Source
AI summary
In a measurement system, a processor sets, on the basis of three-dimensional data, a movement route to be taken by a hand part to cause a contact to follow the surface of an object to be measured in such a manner that a reaction force detected by a force sensor becomes a predetermined value. The processor causes the contact to follow the surface of the object to be measured while adjusting the reaction force to become a predetermined value, and acquires a path taken by the hand part having moved. The processor acquires the roughness of the surface of the object to be measured from the contact during a period in which the contact is caused to follow the surface. The processor measures the dimension of the object to be measured on the basis of the path and at least one of the movement route and the three-dimensional data.