On-machine diameter measurement of a cylindrical workpiece with a reference artefact

Abstract

A system for on-machine diameter measurement of a ceramic cylindrical workpiece on a precision grinding machine is developed by employing a commercial optical micrometer, which can measure the diameter of a workpiece in various sizes. One of the drawbacks of the optical micrometer is its poor thermal stability, which could affect the on-machine diameter measurement in a machine shop where the room temperature is not controlled well. To address the issue, in this paper, a comparative measurement method with a calibrated reference artefact having identical material and nominal diameter with respect to a ceramic workpiece is newly proposed. In the proposed comparative method, the workpiece diameter is evaluated through detecting its deviation from that of the reference artefact calibrated by using a high-precision measuring instrument such as a coordinate measuring machine in advance of the on-machine measurement. Meanwhile, in the comparative measurement method, the uncertainty of the reference artefact should also be taken into consideration as a source of uncertainty. In this paper, measurement uncertainty analysis is carried out for the proposed comparative method based on GUM, while verifying the uncertainty of the reference artefact diameter through numerical calculations by a Monte Carlo method.

A novel IoT based machine vision system for on-machine diameter measurement and optimization

“…Zhang et al [13] designed an image measurement system to measure the small workpiece, but it failed to address the diameter measurement of the workpiece. Shimizu et al [14] proposed a method for 'on-machine diameter measurement of a cylindrical workpiece with a reference artefact' where they addressed the thermal stability issue of a commercial optical micrometer. Shinozaki et al [15] developed a method to detect the deterioration of the blast furnace walls.…”

Investigation and optimization of a novel precision measurement method based on template matching

“…More sensitive temperature, humidity and other sensors are integrated into the system to achieve more stable measurement of nanoscale measurement tasks. In addition, the laser head of the nanoscale laser interferometer measurement system requires a vacuum environment, and its installation and calibration take a relatively long time [7]. This approach exposes significant disadvantages for rapid measurement tasks, or for multiaxis measurement tasks that require reconfiguration of the system.…”

The future of optical measurement technology

“…and they present several advantages over other traditional measurement options. They are non-contact, non-destructive, accurate, fast, and reliable; characteristics which make them a great solution in very different applications for inspection, quality control, and process control purposes [1]. The range of parameters monitored is also very wide.…”