Volume 13, Issue 3, 2018/Journal Proceedings in Manufacturing Systems

Abstract: The paper considers a methodology for efficiency improvement in warehouses. The methodology is developed for the needs of the winter sports equipment division of Amer Sports Corporation. Key aspects of the methodology are the concept development of balanced scorecard for the distribution logistics and the application of lean methods in the warehouse. The main criteria for evaluation of the warehouse processes are examined. The paper presents the implementation of balanced scorecard as a tool for logistics processes and costs monitoring and management decisions in the Amer Sports distribution center for winter sports equipment. The application of the lean methods in the warehouse are also discussed. The paper presents also the improvements achieved by applying the methodology in the warehouse.

Key words: warehouse efficiency improvement, balanced scorecard, logistics controlling, lean manufacturing, warehouse management, process optimization, warehouse automation, winter sports equipment products.

pp. 103-107 View full text

Numerical analysis of mechanical stress behavior of rotary kiln of a cement plant

Mohammed BOUHAFS¹, Abed MEGHDIR², Yassine BELHADADJI³

¹⁾ PhD, Dept. Electromechanical, Institute of Maintenance and Industrial Safety, Univ. Oran 2, Oran, Algeria.

^{2, 3)} PhD, Dept. Electromechanical, Institute of Maintenance and Industrial Safety, Univ. Oran 2, Oran, Algeria.

Abstract: Furnaces are machines that are widely used in industry, especially of cements. They are often subjected to high mechanical and thermal stress. The present work consists in modeling the mechanical behavior of a rotary kiln in stationary regime. The case studied is that of the cement factory LAFARGE Oggaz, Mascara, Algeria. This study aims is to determine the optimal operating conditions under variable mechanical loads. The two load cases considered are traction and compression of the shells. The results obtained, states of stress, deformation and displacement allow the establishment of a prediction model of the highly stressed zones and consequently to improve the parameters of design of the kiln especially in phase of dimensioning. The numerical method used is that of the finite elements as it is implemented in the ANSYS Workbench calculation code.

Key words: Rotary kiln, mechanical stress thermal stress, simulation.

pp. 109-114 View full text

Research on the optimization of the manufacturing technology of the metal parts heat treated in liquid and solid phase

Anişoara CORĂBIERU ¹, Ştefan VELICU ², Petrică CORĂBIERU ^3*, Ștefan IONIȚĂ⁴

¹⁾ Lecturer, Technical University Gheorghe Asachi of Iasi, Romania

²⁾ Prof., PhD, University "Politehnica" of Bucharest, Romania

³⁾ Scientific Researcher II, PhD, SC Procomimpex SRL Iasi, Romania

⁴⁾ PhD Student, Machines and Manufacturing Systems Department, University Politehnica of Bucharest, Romania

Abstract: This paper analyzes the quality of pinion type parts manufactured through the technological procedure of hardening in liquid and solid state phase. The investigations are made by electronic microscopy and optical microscopy, highlighting the structure and composition of the superficial layer and the micro-hardness determinations. Depending on the results obtained, the paper suggests measures for optimization, aiming especially at the values of the most important technological parameters for the technological phase of microalloying in liquid state and induction heat treatment in solid state phase. The hardening of the superficial layer of the pinion type parts is revealed by the high values of the micro-hardness determinations. The hardening and structure of the superficial layer are supporting the implementation of the technological procedure at industrial level.

Key words: hardening, micro-hardness, liquid state phase, solid state phase.

pp. 115-120 View full text

Performing industrial logistic system a chance to create company competence

Elena SIMA^1,*

¹⁾ Lecturer, PhD, department MEI, Faculty of Engineering, „Lucian Blaga” University of Sibiu, Romania

Abstract: Logistics recognized as a scientific and practice activity bringing competitive advantage gains new valences nowadays. It is known that each company wants to obtain products / services at the lowest possible cost without affecting their quality. Logistics becomes an instrument in achieving these goals and at the same time enables the promotion of customer-supplier relationships. Logistic attributes such as time, quality and cost of the logistics system should focus on adapting them to the needs and expectations of customers. Starting from the need to add value to the customer without significantly increasing costs, logistics activities need to be integrated with other functions such as marketing, sales, manufacturing, finance, information technology, etc. If not long ago the logistics-specific activities were grouped together with other activities, the literature now insists on their strategic importance. The paper aims to highlight several ways to reduce the costs and achieve competitive advantage that depend on efficient and effective managing, so excellence logistic activities.The excellence of logistics activities is reflected in the price of the finished product, which can affect up to 85%, depending on the industry. The paper highlights how an efficient logistics system leads to the growth of turnover and profits of companies with concerns in this respect.

Key words: industrial logistic system, performance, efficiency.

pp. 121-126 View full text

Single point incremental forming ‒ comparison between technological equipment by an overall processing time point of view

Radu-Eugen BREAZ^1,*, Melania TERA², Vlad Andrei CIUBOTARIU³, Viorel COHAL⁴, Cătălina MAIER⁵, Gabriela PLĂIAȘU⁶

¹⁾ Prof., PhD, Department of Industrial Machines and Equipment, “Lucian Blaga” University of Sibiu, Sibiu, Romania

²⁾ Ass. Prof., PhD, Department of Industrial Machines and Equipment, “Lucian Blaga” University of Sibiu, Sibiu, Romania

³⁾ Ass. Prof., PhD, Department of Industrial Systems Engineering and Management, “Vasile Alecsandri” University of Bacău, Bacău, Romania

⁴⁾ Assoc. Prof., PhD, Department of Machine Manufacturing Technology, “Gheorghe Asachi” Technical university of Iaşi, Iași, Romania

⁵⁾ Prof., PhD, Department of Manufacturing Engineering, “Dunărea de Jos” University of Galați, Galați,

⁶⁾ Assoc. Prof., PhD, Department of Manufacturing and Industrial Management, University of Pitești, Pitești, Romania

Abstract: Single point incremental forming (SPIF) can be unfolded on various technological equipment. CNC milling machines and industrial robots are usually chosen for this purpose, both having advantages and drawbacks. The most obvious advantage of the industrial robots relies upon their superior kinematic, due the superior number of axes, especially when compared with 3-axis CNC milling machines. However, most of the parts manufactured by means of SPIF have simple shapes, which usually do not require more than 3-axis equipment for processing. Thus, it is arguable if using industrial robots for SPIF process could be justified by an economic point of view. The approach presented in this paper compares, by means of simulation, three processing strategies used for manufacturing a simple truncated cone shaped part, using a 3 axis CNC milling machine and an industrial robot. Moreover, the kinematic of the industrial robot is further improved by using a special positioning unit, which add two supplementary axis to the equipment. In order to run the simulation process, kinematic models for both equipment were developed. The processing regime (speed and feeds) was kept the same for all three simulated strategies. The main goal of the proposed approach was to test if the use of an equipment with superior kinematic (industrial robot) adds any advantages to the process, when manufacturing simple parts.

Key words: single point incremental forming, CNC milling machine-tool, industrial robot, kinematic.

pp. 127-132 View full text

The development of a laboratory system to experiment methods to improve the production flows

Ana GAVRILUŢĂ¹, Eduard Laurenţiu NIŢU^2,*, Alin GAVRILUŢĂ³, Daniel Constantin ANGHEL¹, Nicolae Doru STĂNESCU², Maria Crina RADU⁴, Gheorghe CREȚU⁵, Cristina Maria BIRIȘ⁶, Viorel PĂUNOIU⁷

¹⁾ Lecturer, PhD, Manufacturing and Industrial Management Department, University of Piteşti, Pitești, Romania

²⁾ Prof., PhD, Manufacturing and Industrial Management Department, University of Piteşti, Pitești, Romania

³⁾ PhD Student, Manufacturing and Industrial Management Department, University of Piteşti, Pitești, Romania

⁴⁾ Assoc. Prof., PhD, Engineering and Industrial Systems Management Department, "Vasile Alecsandri" University of Bacău, Bacău, Romania

⁵⁾ Assoc. Prof., PhD, Manufacturing Engineering Department, "Gheorghe Asachi" Technical University of Iaşi, Iaşi, Romania

⁶⁾ Lecturer, PhD, Industrial Machinery and Equipment Department, "Lucian Blaga" University of Sibiu, Sibiu, Romania

⁷⁾ Prof., PhD, Manufacturing Engineering Department, "Dunărea de Jos" University of Galaţi, Galaţi, Romania

Abstract: Globalization of production and strong competition in the automotive industry requires manufacturers to offer their customers a wide range of products, of the best quality and at lower prices. This requires uniform production flow, increase the flexibility of the production system and its responsiveness to customer requests. To achieve these goals, it is necessary to use in the layout planning, work organization and production management the most modern methods, techniques and tools of production management, such as modeling and simulating production flows and Lean manufacturing. In this context, the present paper describes the developing of a laboratory system that allows, the research in laboratory conditions of modern manufacturing methods and their transfer to factories from automotive industry. The laboratory system is made of integrated research platforms, specific to layout design, modeling and simulation flows and Lean manufacturing and include also elements of digitalization (Industry 4.0). In this paper are described briefly the main characteristics of the research platforms made until now and the ways in which these can be used.

Key words: layout design, flow simulation, Lean manufacturing, production flows.

pp. 133-140 View full text

Single point incremental forming using kuka kr6-2 industrial robot - a dynamic approach

Mihai CRENGANIȘ^1,*, Alexandru BÂRSAN², Sever-Gabriel RACZ³, Monica Daniela IORDACHE⁴

¹⁾ Assistant Prof., PhD, Machine and Industrial Equipment Department, "Lucian Blaga" University of Sibiu, Romania

²⁾Assistant Prof., PhD Student, Machine and Industrial Equipment Department, "Lucian Blaga" University of Sibiu, Romania

³⁾Prof., PhD, Head of department, Machine and Industrial Equipment Department, "Lucian Blaga" University of Sibiu, Romania

⁴⁾ Assoc. Prof., PhD, Manufacturing and Industrial Management Department, University from Pitesti, Romania

Abstract: The single point incremental forming process (SPIF) of the metal sheets is a modern method of plastic deformation, with an enormous potential regarding the flexibility and personalization of the parts obtained by this process. SPIF of a sheet metal is a technologic manufacturing process where a sheet metal is formed into a desired part by a series of small incremental deformations. The main research objective is to determine the joint torques from the kinematic structure of the KUKA KR6-2 industrial robot during SPIF process. The dynamic model of the robot during SPIF processes is also presented. This study is necessary to determine if KUKA KR6-2 robot can be used for SPIF manufacturing processes of thin metal sheets without mechanical failure over time. To study and simulate the KUKAKR6-2 robot's dynamic behavior during the SPIF process, first the forces that appear during the process must be examined.

Keywords: Single point incremental forming, KUKA KR6-2, force analysis.

pp. 141-146 View full text

Design of a car body part using reverse engineering and FEM

Viorel PAUNOIU^1,*, Virgil TEODOR², Melania TERA³, Nadia BELU⁴, Ciprian CIOFU5, Nicolae TAMPU⁶

¹⁾ Prof., Head of Department of Manufacturing Engineering, "Dunarea de Jos" University of Galati, Galati, Romania

²⁾ Assoc. Prof., Department of Manufacturing Engineering, "Dunarea de Jos" University of Galati, Galati, Romania

³⁾ Lecturer, Department of Industrial Machinery and Equipment, "Lucian Blaga" University of Sibiu, Sibiu, Romania

⁴⁾ Lecturer, Manufacturing and Industrial Management Department, University of Pitesti, Pitesti, Romania

⁵⁾ Lecturer, Department of Machine Manufacturing Technology, "Gheorghe Asachi" Technical University of Iasi, Iasi, Romania

⁶⁾ Lecturer, Department of Industrial Systems Engineering and Management, University "Vasile Alecsandri" of Bacau, Bacau, Romania

Abstract: Deep drawing, as the main technology for obtaining car body parts, is one of the fields where the virtual design of parts and process is used for product development. The use of FEM in sheet metal forming processes is an efficient tool of virtual design that has replaced the physical try-out method in terms of costs and time consuming. In the paper steps necessary in virtual design and verification of a car body part are presented. The design process starts with the design analysis and the creation of the part model using reverse engineering. Then the model is analyzed using FEM. By numerical simulation is obtained the form and the dimensions of the blank. After defining the deep drawing tool the process of deformation is modeled. An analysis of part, in terms of geometry, thickness and stresses variation is made. It is presented the module of forming limit diagram of the program and the results of the analysis of the part using this module. Finally, the results of this study could be used and improved by the car manufacturers.

Key words: deep drawing, numerical simulation, car body design, reverse engineering, Dynaform.

pp. 147-152 View full text

Review of recent stretch forming development

Gheorghe BRABIE¹, Roxana LUPU^2,*, Alin Daniel RIZEA³, Constantin CĂRĂUȘU⁴, Anca-Lucia CHICEA⁵, Cătălina MAIER⁶

¹⁾ Prof., "Vasile Alecsandri" University of Bacău, Faculty of Engineering, Bacău, Romania

²⁾ Research assistant, "Vasile Alecsandri" University of Bacău, Faculty of Engineering, Bacău, Romania

³⁾ Prof., University of Pitesti, Faculty of Engineering, Piteşti, Romania

⁴⁾ Prof., Technical University "Gheorghe Asachi" of Iași, Faculty of Engineering, Iași, Romania

⁵⁾ Prof., University "Lucian Blaga" of Sibiu, Faculty of Engineering, Sibiu, Romania

⁶⁾ Prof., University "Dunărea de Jos" of Galaţi, Faculty of Engineering, Galaţi, Romania

Abstract: The forming process, reviewed in the present paper, is a conventional method used in deforming metal sheet, using a clamping method and a die. Through the paper numerous types of processes were shown. The main consideration was the mechanists behind each process and how it improves key factor like producibility, repeatability, sustainability and conformability. Described in the introduction is the different type of sheet metal forming processes, the deformation mechanism, deform materials, industries where it is successfully implemented. The main types of processes described are classic die stretch forming, multi-point die stretch forming (MPSF), single point incremental forming (SPIF) combined with stretch forming and numerical simulation of the stretch forming process, with respect to classic die, multi-point die and flexible multi-grippers. More or less the aerospace industry has a high use of stretch forming parts. Nevertheless, industries like architectural constructions, automotive and naval benefit from the major developments of this process. MPSF and the hybrid SPFI and stretch forming processes solved the problem of multiple curvature sheet deforming, grooves and pockets. As a conclusion, to this review, it can be stated that conventional stretch forming has undergone a remarkable evolution in term of process adaptability and flexibility, being able to perform operations of high complexity.

Key words: stretch forming, flexible gripper, multi-point die, spring-back, SPIF.

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