The measuring system for estimation quality of the thermionic cathodes by current LF-noise

The article discusses the quality testing of a measuring system consisting of a CNC machine with measuring probes. The research was conducted in a broader context regarding the implementation of the closed door technology, i.e., production without human intervention, in an aviation plant manufacturing aircraft gearbox systems. This technology may involve automated measuring operations performed in machining centers, and not in measuring laboratories, provided that the quality of the measurements is appropriate. The aim of the study was to investigate whether the CNC machining device can be used to measure the geometric features of aircraft gearbox housing. For this purpose, measurement experiments were carried out with the use of three different probes. Measurements were carried out using four sequences of increasing complexity, so that, after error analysis, it was possible to find the causes of possible irregularities. A reference ring with known dimensions and position in the working space of the machine was used for the measurements performed as part of the assessment of the measurement system. The quality of the measurements was evaluated with the use of repeatability and reproducibility testing and statistical process control. The analysis results showed that the tested measurement system ensures adequate accuracy and repeatability, and the measurement process is characterized with adequate efficiency in relation to the manufacturing tolerance of the components produced using the machine. Thus, it was proven that the measurement process can be carried out on a machining device, which enables its integration into the closed door technology.

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DORST Netshape® 4.0 – The Next Step Towards Autonomous Manufacturing

10.20944/preprints202102.0104.v1 ◽

2021 ◽

Author(s):

Lutz Lackner ◽

Mats Larsson

Keyword(s):

Industry 4.0 ◽

Manufacturing System ◽

Measuring System ◽

High Quality ◽

Pressing Force ◽

Part Geometry ◽

Die Filling ◽

New System

In the production of green parts from powder, there is unavoidable slight deviation in the die filling, even when high-quality powders are used. The quantity of powder in the die varies and thus affects the weight of the compact. This filling variation results in variation of the pressing force, and thus influences the part geometry. The development of the DORST Netshape® System was conceived as an autonomous manufacturing system in order to compensate for these effects. Based on the Dorst Industry 4.0 innovations for part weight measuring immediately after pressing in combination with a laser dimension measuring system, this technology package attempts to reach enhanced precision and consistency in production. The paper presents results from various trials that show the capability of this new system, designed to improve the quality of pressed parts.

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Developing a Measuring System for Monitoring the Thickness of the 6 m Wide HDPE/LDPE Polymer Geomembrane with Its Continuous Flow Using Automation Equipment

Applied Sciences ◽

10.3390/app112110045 ◽

2021 ◽

Vol 11 (21) ◽

pp. 10045

Author(s):

Tatyana Nikonova ◽

Olga Zharkevich ◽

Essim Dandybaev ◽

Murat Baimuldin ◽

Leonid Daich ◽

...

Keyword(s):

Continuous Flow ◽

High Density Polyethylene ◽

Foreign Bodies ◽

Automated System ◽

Measuring System ◽

Original Design ◽

Software Complex ◽

Automation Equipment ◽

Production Conditions

As a result of R&D, a measuring system for controlling the thickness of the HDPE/LDPE (high-density polyethylene/low-density polyethylene) polymer geomembrane was developed using automation equipment. The relevance of this work consists of the development of a domestic, relatively inexpensive system for controlling the thickness of the HDPE/LDPE polymer geomembrane in production conditions based on modern equipment for enterprise automation. The scientific novelty consists of the use of original design solutions in the development of hardware and software complex mechanisms that allow controlling the thickness of the HDPE/LDPE polymer geomembrane layers along the entire width of the shaft, excluding deformation of the film as a result of foreign bodies entering during extrusion, cuts, monitoring the quality of the film in real time, as well as the possibility of analyzing the measured parameters in the database of the automated system.

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Analysis of Forming Limits in Sheet Metal Forming with Pattern Recognition Methods. Part 2: Unsupervised Methodology and Application

Materials ◽

10.3390/ma11101892 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1892 ◽

Cited By ~ 3

Author(s):

Christian Jaremenko ◽

Emanuela Affronti ◽

Andreas Maier ◽

Marion Merklein

Keyword(s):

Pattern Recognition ◽

Sheet Metal ◽

Optical Measurement ◽

Unsupervised Classification ◽

Evaluation Methods ◽

Time Dependent ◽

Measuring System ◽

Forming Limit ◽

Element Analysis

The forming limit curve (FLC) is used in finite element analysis (FEA) for the modeling of onset of sheet metal instability during forming. The FLC is usually evaluated by achieving forming measurements with optical measurement system during Nakajima tests. Current evaluation methods such as the standard method according to DIN EN ISO 12004-2 and time-dependent methods limit the evaluation range to a fraction of the available information and show weaknesses in the context of brittle materials that do not have a pronounced constriction phase. In order to meet these challenges, a supervised pattern recognition method was proposed, whose results depend on the quality of the expert annotations. In order to alleviate this dependence on experts, this study proposes an unsupervised classification approach that does not require expert annotations and allows a probabilistic evaluation of the onset of localized necking. For this purpose, the results of the Nakajima tests are examined with an optical measuring system and evaluated using an unsupervised classification method. In order to assess the quality of the results, a comparison is made with the time-dependent method proposed by Volk and Hora, as well as expert annotations, while validated with metallographic investigations. Two evaluation methods are presented, the deterministic FLC, which provides a lower and upper limit for the onset of necking, and a probabilistic FLC, which allows definition of failure quantiles. Both methods provide a necking range that shows good correlation with the expert opinion as well as the results of the time-dependent method and metallographic examinations.

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Information-measuring system to improve the quality of motion control robot manipulators

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/680/1/012008 ◽

2019 ◽

Vol 680 ◽

pp. 012008

Author(s):

K I Goryanina ◽

O I Katin ◽

M A Vernezi ◽

D Yu Donskoy ◽

L A Tregubenko ◽

...

Keyword(s):

Motion Control ◽

Robot Manipulators ◽

Measuring System ◽

Information Measuring ◽

Information Measuring System ◽

Quality Of Motion

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Analysis for the Computation Method of Crown on Hot Strip Production Line

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.644-650.4822 ◽

2014 ◽

Vol 644-650 ◽

pp. 4822-4825

Author(s):

Xiang Ping Cao ◽

Yan Chen ◽

Mei Xing Liu

Keyword(s):

Thickness Distribution ◽

Product Line ◽

Measuring System ◽

Computation Method ◽

Hot Strip ◽

Nominal Thickness ◽

The Mean ◽

Strip Crown ◽

Strip Production

In this paper, the computation method of the strip crown is analyzed using the measured strip thickness data on a hot strip product line. The better quality of the strip is achieved for the smaller crown and the closer of the mean thickness to the nominal thickness. The polynomial approximation method for the transverse thickness distribution of the strip is used, and the different degrees of the polynomial are selected for calculating the strip crown. The calculated results are compared with the output of the measuring system in a rolling factory.

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Analysis and Modeling of UML-Based Multiple Noise Measuring System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.562-564.2170 ◽

2012 ◽

Vol 562-564 ◽

pp. 2170-2173

Author(s):

Sheng Bao Wang ◽

Jun Zhang ◽

Xiao Chang Hu

Keyword(s):

Embedded System ◽

Production Line ◽

Test System ◽

Measuring System ◽

Design Concepts ◽

Noise Test ◽

The Embedded System

UML is employed to greatly improve the development speed and quality of embedded system and to raise the reusability of the system. The design concepts are shown graphically, which is helpful for the intercommunication of people from different fields. Easy intercommunication is surely beneficial for the development, maintenance of the system and the design of subsequent production line. The paper analyzes the process of applying UMB to the embedded system and the ways of modeling through the analysis of a multiple noise test system.

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A finned-riser design to avoid the capillarity effect in multi-jet fusion technology

Rapid Prototyping Journal ◽

10.1108/rpj-01-2020-0020 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Mattia Mele ◽

Giampaolo Campana ◽

Gian Luca Monti

Keyword(s):

Analytical Model ◽

Dimensional Accuracy ◽

Measuring System ◽

Original Design ◽

Heat Management ◽

Convex Shape ◽

Content Type ◽

Riser Design ◽

Under Construction

Purpose Multi-jet fusion (MJF) process is based on a polymeric powder bed that is heated and irradiated by infra-red lamps. The layer under construction is jetted with inks to provide the desired heat management conditions for selective melting. Depending on several process variables, manufactured parts can exhibit lifting of the borders of the top surface of the shape under construction. This phenomenon is related to the capillarity effect. As a result, the top surface of MJF-manufactured parts can present a peculiar convex shape. This study aims to propose a solution that instead induces the capillarity effect outside of the part under construction. Design/methodology/approach A specific design is developed to avoid the capillarity effect in MJF. It is based on an analytical model that was previously developed by the authors to estimate the shape and extent of the capillary on top surfaces of benchmark components. The proposed methodology is established by the predicted calculation of maximum values of capillarity rise and length, and safety factors. A fin-shaped geometry is designed to avoid the capillarity effect. An experimental campaign is implemented to verify the effectiveness of the proposed solution. Prototypes are manufactured by an HP MultiJet 4200 in the original design and the so-called finned-riser design, by adding a well-dimensioned appendage on the top surface to shift the capillarity effect outside the border of the part under construction. Measurements are done by a CAM2 ScanArm contactless measuring system to achieve the real shape of top surfaces. Geomagic Control X software by 3D systems is used to evaluate the quality of measured surfaces in comparison with the expected geometry of the top plane of the benchmark. Findings The investigated approach involves adding an auxiliary finned-shape appendage, which acts similarly to the risers in foundry technology, to the top surface of the part that is being produced by MJF technology. The procedure and rules for determining the dimensions of the fin are established based on physical considerations and process modelling. The method is then applied to a prototype part, which is designed to highlight the effectiveness of the finned-riser design for improving the dimensional accuracy of the top surfaces of products manufactured by the MJF process. Experimental measurements of top surfaces of the original benchmark are compared to the same ones in the case of the finned-riser benchmark. Reported results are satisfactory, and the capillary effect occurred in the fins outside the border edges of the part. Further developments are planned to extend the proposed design. Originality/value MJF technology is attracting large interest from manufacturers to produce mass customised products. The quality of manufactured parts could be affected by peculiar defects related to process parameters. The present work aims to show a method to avoid the capillarity effect. It is based on an original analytical model developed by the authors and implemented successfully in the case of a benchmark geometry.

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