Volume 14, Issue 1, 2019/Journal Proceedings in Manufacturing Systems

Abstract: This paper presents a part of the theoretical and experimental researches carried out on the design and realization of a high-pressure cooling installation for turning centers. Besides the general theoretical aspects, adaptable to most of the existing machine tools, the work emphasizes especially those of modern machine tools (CNC), which are processing with high cutting speeds, in the case of series and mass productions. The projected and designed installation is designed for a turning machining center based on a SC14 vertical lathe and allows the tool and the semi-product to be cooled by program control from the outside of the tool and, where appropriate, through the inside of the tool. The authors present some aspects of the necessity and the advantages of using this installation, and also the scheme and its construction.

Key words: turning machining center, high-pressure cooling equipment, hydraulic installation.

pp. 9-14 View full text

Task-oriented off-line parametric programming of an industrial robot serving CNC lathes

George VOSNIAKOS^1,*, Athena PAROUSI¹, George LEIVADIOTAKIS¹, Lucas BLEIN², Charlotte LASSIME²

¹⁾ Prof., Manufacturing Technology Section, School of Mechanical Engineering, National Technical University of Athens, Greece

²⁾ Dipl. Eng., Manufacturing Technology Section, School of Mechanical Engineering, National Technical University of Athens, Greece

³⁾ M. Eng., Manufacturing Technology Section, School of Mechanical Engineering, National Technical University of Athens, Greece

⁴⁾ Dipl. Eng., Ecole National d’ Ingenieurs de St Etienne (ENISE), Saint-Etienne, France

⁵⁾ Dipl. Eng., Ecole National d’ Ingenieurs de St Etienne (ENISE), Saint-Etienne, France

Abstract: Industrial robotic arms are often employed in machine tool tending. If the scope of programming is restricted to a specific machine tool type, the tasks involved become standard to a large extent. Therefore, the corresponding movements can be parametrically described and linked to the shape of the particular machine tool tended. Thus, a ‘master’ robot trajectory and corresponding robot program in the supported language can be parametrically defined off-line by making use of a simplified 3D model of the machine tool and an accurate 3D model of the robot. Subsequently, this can be easily tailored to the particular machine tool of the given type by simply updating the respective parameter values. This process has been implemented and demonstrated for a six axis industrial robot tending computer numerically controlled lathes.

Key words: robot programming, parametric, tasks, off-line, simulation.

pp. 15-20 View full text

Maintaining a subtle balance between conservative and precise solutions in the aerospace static concession processes

Tudor George ALEXANDRU^1,*, Mircea Gabriel BURTOIU², Robert RUSU³

^1,3) Eng., PhD Student, Aerospace Stress Engineer, Assystem Technologies, Bucharest, Romania

²⁾ Eng., Aerospace Stress Engineer, Assystem Technologies, Bucharest, Romania

Abstract: The Static Stress represents a main task of the aerospace concessions workflow that is used to address the impact of manufacturing non-conformities on local and global criteria. The process benefits from conservatism, being most of the times a fast way to prove that a non-conformal part can withstand damage. Even so, critically loaded components are already subject to conservative assumptions that are applied in the certification stage. As a consequence, the results achieved are unrealistic, lowering the amount of conservatism demanding for extra time and economic resources. To cope with these aspects, an approach is proposed involving the use of parametric finite element method models for studying the variation of mechanical stresses due to possible non-conformity thresholds. Knock Down Factor charts are developed based on the effect of load redistribution. The approach can successfully be re-used for similar types of non-conformities. The given concepts are proved by means of practical examples throughout the work.

Key words: aerospace, concessions, DFEM, GFEM, Patran, SAMCEF.

pp. 21-26 View full text

A basic platform and electronics interfaces board for family therapeutics tools to surgical robots

Veronika IVANOVA^1,*, Ditchko BATCHVAROV², Ani BONEVA³, Zlatoliliya ILCHEVA⁴,

¹⁾ Assist. Prof. PhD Student, Department of Robotized Executive Mechanisms and Intelligent Systems, Institute of Robotics, Bulgarian Academy of Sciences, Sofia, Bulgaria

²⁾ Mag. Math., Department of Communication Systems and Services, Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria

³⁾ Assist. Eng., Department of Communication Systems and Services, Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria

⁴⁾ Assoc. Prof., PhD, Department of Communication Systems and Services, Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, Sofia, Bulgaria

Abstract: Robotic technologies are advancing in the field of minimally invasive surgery. The last decade, more than 1.5 million laparoscopic surgical procedures, including gynecologic, cardiac, urology, thoracic, and general surgery, have been performed by popular robotic and mechatronic systems for minimally invasive surgery. In contrast to big popular robot systems, which are designed for manipulation and video observation, this paper describes a novel instrument for therapy. The purpose of the paper is to present the design of a compact, convenient, simplified, better, and affordable priced device, so that small hospitals can access and benefit from these systems. The ultimate goal is to radically improve the quality and efficiency of healthcare.

Key words: robot system; therapeutics tasks; surgery, therapeutics tools, laparoscopic surgery.

pp. 27-32 View full text

System for documents securing and intelligent management

George ENCIU^1,*, Adrian POPESCU², George CONSTANTIN³, Emilia POPESCU⁴

¹⁾ Prof., PhD, Robots and Production Systems Department, University "Politehnica" of Bucharest, Romania

²⁾ Lecturer, PhD, Robots and Production Systems Department, University "Politehnica" of Bucharest, Romania

³⁾ Prof. PhD, Robots and Production Systems Department, University "Politehnica" of Bucharest, Romania

⁴⁾ Assistant Prof., PhD, Robots and Production Systems Department, University "Politehnica" of Bucharest, Romania

Abstract: The use of the RFID technology in all engineering-specific areas is no longer a novelty, this technology being employed today for documents securing and management. This paper presents an integrated system of documents securing and management, with the emphasis on its components (intelligent paper, specialized software computer, printer, reading mode, office mini-archive and the storage and management system of the archive-type printed documents) and the TagDoc specialized software application (TagDoc Print, TagDoc Write, TagDoc Card, TagDoc Arch, TagDoc MiniArchive). The general architecture specific to the system is also presented, by highlighting the distinct areas within it: the access module, the documents securing module and the intelligent archive module. At the end of the paper, a use case is presented that points out how to secure a document by showing all the stages needed to secure and print the RFID tagged document, which can be tracked throughout the life cycle of the electronic chip.

Key words: RFID, intelligent paper, TagDoc, printer, archive.

pp. 33-38 View full text

Cloud based cutting tool load monitoring and control system

Uros ZUPERL^1,*, Miha KOVACIC²

¹⁾ Assoc. Prof., University of Maribor, Faculty of mechanical engineering, Maribor, Slovenia

²⁾ Assoc. Prof., Štore Steel, Štore, Slovenia

Abstract: This paper presents a cloud based cutting tool load monitoring and control system for machining of functionally graded metal materials. This is a cutting tool load control system which connects the computing and service resources in the cloud with the physical resources in the factory level and thus forming a cyber-physical monitoring system (CPMoS) for milling. The two level CPMoS with the ability to connect the cyber world with the physical world via sensors and actuators is realized in order to maintain the cutting tool load constant by digital adaptation of machining parameters. The CPMoS provides a novel way to compensate all disturbances during the cutting process by controlling the cutting tool loads through cloud technologies. The cloud part of the CPMoS performs seven actions: sensing, information processing, edge computing, tool load data analysis and modeling, supervised monitoring, data visualization and process correction. An artificial neural network is applied to precisely model and in-process estimate the maximal and average tool loads. The physical layer consist of a CNC machine tool, piezoelectric dynamometer and local terminal which acquire, pre-process and transmit the signals from the dynamometer to the IoT gateway in the cloud platform. The special interest of future activities is to perform machining experiments in order to test the feasibility of the CPMoS for tool load monitoring in end-milling.

Key words: machining, end milling, cloud technologies, cutting tool load, control, monitoring.

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