In-Line Dimensional Inspection of Warm-Die Forged Revolution Workpieces Using 3D Mesh Reconstruction

Egileak: Daniel Mejía Jairo R. Sánchez Tapia Oscar Ruiz Marcos Alonso Alberto Izaguirre Erik Gil Jorge Palomar Jorge Posada Velásquez

Data: 14.03.2019

Applied Sciences


Abstract

Industrial dimensional assessment presents instances in which early control is exertedamong “warm” (approx.  600◦C) pieces.  Early control saves resources, as defective processes aretimely stopped and corrected.  Existing literature is devoid of dimensional assessment on warmworkpieces. In response to this absence, this manuscript presents the implementation and results of anoptical system which performs in-line dimensional inspection of revolution warm workpieces singledout from the (forming) process. Our system can automatically measure, in less than 60 s, the circularrunout of warm revolution workpieces. Such a delay would be 20 times longer if cool-downs wererequired. Off-line comparison of the runout ofT-temperature workpieces (27◦C≤T≤560◦C) showsa maximum difference of 0.1 mm with respect to standard CMM (Coordinate Measurement Machine)runout of cold workpieces (27◦C), for workpieces as long as 160 mm. Such a difference is acceptablefor the forging process in which the system is deployed.  The test results show no correlation betweenthe temperature and the runout of the workpiece at such level of uncertainty. A prior-to-operationAnalysis of Variance (ANOVA) test validates the repeatability and reproducibility (R&R) of ourmeasurement system. In-line assessment of warm workpieces fills a gap in manufacturing processeswhere early detection of dimensional misfits compensates for the precision loss of the vision system.The integrated in-line system reduces the number of defective workpieces by 95%

BIB_text

@Article {
title = {In-Line Dimensional Inspection of Warm-Die Forged Revolution Workpieces Using 3D Mesh Reconstruction},
journal = {Applied Sciences},
pages = {1069},
volume = {9},
keywds = {
in-line dimensional inspection; warm forming; 3D mesh reconstruction; optical system;revolution workpiece
}
abstract = {

Industrial dimensional assessment presents instances in which early control is exertedamong “warm” (approx.  600◦C) pieces.  Early control saves resources, as defective processes aretimely stopped and corrected.  Existing literature is devoid of dimensional assessment on warmworkpieces. In response to this absence, this manuscript presents the implementation and results of anoptical system which performs in-line dimensional inspection of revolution warm workpieces singledout from the (forming) process. Our system can automatically measure, in less than 60 s, the circularrunout of warm revolution workpieces. Such a delay would be 20 times longer if cool-downs wererequired. Off-line comparison of the runout ofT-temperature workpieces (27◦C≤T≤560◦C) showsa maximum difference of 0.1 mm with respect to standard CMM (Coordinate Measurement Machine)runout of cold workpieces (27◦C), for workpieces as long as 160 mm. Such a difference is acceptablefor the forging process in which the system is deployed.  The test results show no correlation betweenthe temperature and the runout of the workpiece at such level of uncertainty. A prior-to-operationAnalysis of Variance (ANOVA) test validates the repeatability and reproducibility (R&R) of ourmeasurement system. In-line assessment of warm workpieces fills a gap in manufacturing processeswhere early detection of dimensional misfits compensates for the precision loss of the vision system.The integrated in-line system reduces the number of defective workpieces by 95%


}
doi = {10.3390/app9061069},
date = {2019-03-14},
}
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