F. Martín

• University of Malaga

The present work developed a first approach to the manufacturing of turning inserts using the emerging Additive Manufacturing (AM) technology, specifically employing the fused filament fabrication (FFF) process, based on the extrusion of material and deposition layer by layer. Traditionally, this type of cutting tools were manufactured by powder me...

Additive Manufacturing (AM) represents a technology that provides access to part designs that are impossible or very difficult to achieve by any other manufacturing process. In addition to this consideration, the possibility of customization, and consequently, the almost immediate adaptation of dimensions and geometries makes the AM an exceptional...

This study compares subtractive manufacturing (SM) and additive manufacturing (AM) techniques in the production of stainless-steel parts with non-stick coatings. While subtractive manufacturing involves the machining of rolled products, additive manufacturing employs the FFF (fused filament fabrication) technique with metal filament and sintering....

The aim of this work was to conduct a dimensional study, in terms of microgeometry, using parts from an additive manufacturing process with fused filament fabrication (FFF) technology. As in most cases of additive manufacturing processes, curved surfaces were obtained via approximation of planes with different inclinations. The focus of this experi...

Teaching subjects such as Manufacturing Engineering requires the use of effective teaching tools, which help students in their learning process. While the traditional transmission model can be effective when teaching concepts and theoretical contents, others activities are essential to allow students to participate, act or reflect, thus developing...

This paper presents the results of a comparative evaluation of the tensile strength behaviors of parts obtained by additive manufacturing using fused filament fabrication (FFF) technology. The study investigated the influences of the deposition printing parameters for both polymers and fiber-reinforced polymers. Polymeric materials that are widely...

This paper presents the analytical method capacity of the upper bound theorem, under modular approach, to extend its application possibilities. Traditionally, this method has been applied in forging processes, considering plane strain condition and parts with double symmetry configuration. However, in this study, the double symmetry is eliminated b...

The analysis to determine the necessary forces with which to achieve a plastic deformation in metallic materials, in particular, in forging processes and under conditions of plain strain, has been raised over the years through a double approach; on the one hand, by analytical methods that involve a great complexity in their developments but that al...

The analysis to determine the necessary forces with which to achieve a plastic deformation in metallic materials, in particular, in forging processes and under conditions of plain strain, has been raised over the years through a double approach; on the one hand, by analytical methods that involve a great complexity in their developments but that al...

The present work is intended for residual oxide scale detection and classification through the application of image processing techniques. This is a defect that can remain in the surface of stainless steel coils after an incomplete pickling process in a production line. From a previous detailed study over reflectance of residual oxide defect, we pr...

The paper describes an experimental study developed on the AA7075 T651, which is an aluminum alloy extensively used in the aeronautical industry. This work presents a double approach of investigation where there is no literature about previous research. This includes the analysis of the results obtained by the combination of mechanical and chemical...

The indentation process is presented nowadays in the manufacturing industry as a forming process and not only as a hardening test. This new consideration is due to the incremental forming processes that are being developed and implemented. Previous studies present the Upper Bound Theorem as a suitable technique for the analysis of deformation proce...

The application of incremental processes in the manufacturing industry is having a great development in recent years. The first stage of an Incremental Forming Process can be defined as an indentation. Because of this, the indentation process is starting to be widely studied, not only as a hardening test but also as a forming process. Thus, in this...

Present study yields an alternative technique to model an indentation process, considering the hardening effect. Earlier works focus on modelling the material behaviour during indentation under the new Modular Upper Bound Theorem. The material was analysed under plane strain conditions and rigidperfectly plastic material. Now, the aim of this resea...

Tribological conditions can change drastically during heavy loaded regimes as experienced in metal forming; this is especially critical when lubrication can only be applied at the early stage of the process because the homogeneous lubricant layer can break along the die-workpiece interface. In these cases, adopting a constant friction factor for th...

Focusing on incremental bulk metal forming processes, the indentation process is gaining interest as a fundamental part of these kinds of processes. This paper presents the analysis of the pressure obtained in indentation under the influence of different punch geometries. To this end, an innovative Upper Bound Theorem (UBT) based solution is introd...

At the presented work, the results obtained by the implementation of self-assessment tools in the subject of Manufacturing Engineering are analyzed. This is the first subject that has been taught by the Department of Manufacturing Engineering Processes at the University of Malaga in all new engineering degrees within the EHEA framework. First, weak...

The purpose of this work is to analyze the methodology developed in the Educational Innovation Project PIE13-025 implementation. The methodology aims to promote the ICT tools (Information and Communication Technologies) use by means of the Campus Virtual platform. The subjects set in which the methodology is applied belongs to the Area of “Manufact...

Nowadays, due to the new deformation processes that are being developed like the Incremental Forming Process (IFP) or the Localized-Incremental Forming Process (LIFP), indentation processes are regaining importance again. In this paper, in order to cover the largest possible number of cases in the study of indentation a tilted punch is considered....

In previous studies based on indentation processes, the application of the Upper Bound Theorem (UBT) Modular Model by means of Triangular Rigid Zones (TRZ) has being analyzed. These studies were carried out with plane strain conditions and rigid-perfectly plastic material. One of the advantages of working with the modular procedure of the UBT, is t...

The compression ring test is universally accepted as a perfectly valid method by which determine simply and reliably the adhesion friction factor in a plastic deformation process. Its methodology is based on the application of geometric changes as both the reduction in thickness as the decrease in bore inner diameter in the strained ring itself. In...

Present work shows the teaching-learning experience developed in the Department of Manufacturing Engineering of the University of Malaga. This experience is based on the need to generate a specific glossary of manufacturing engineering terms to be used as a study guide by the students. Eventually, it was decided to make a Thesaurus that would be ai...

The ring compression test is considered one of the most reliable ways to obtain the friction shear factor existing in a plastic deformation process, particularly in open die forging processes. The test is performed on a ring-shaped specimen, so that the whole workpiece is axisymmetric. The application of the upper bound theorem with a triangular ri...

Nowadays, thanks to the new manufacturing processes, indentation is becoming an essential part of the new arising processes such as the Incremental Forming Processes. This work presents the experimental validation of the analytical model developed for an indentation-based process. The analytical model is originated from the Upper Bound Theorem appl...

In previous studies based on indentation processes, the application of the Upper Bound Theorem (UBT) Modular Model by means of Triangular Rigid Zones (TRZ) has being analyzed. These studies were carried out with plane strain conditions and rigid-perfectly plastic material. One of the advantages of working with the modular procedure of the UBT, is t...

The knowledge of the different machines operation and their main mechanism has a great importance in mechanical engineer formation. Thus, in the manufacturing field, it is essential to understand the behaviour and basic principles of the machine tools. This paper presents some experiences developed by the manufacturing teachers of the University of...

It has been established, in previous studies, the best adaptation and solution for the implementation of the modular model, being the current choice based on the minimization of the p/2k dimensionless relation obtained for each one of the model, analyzed under the same boundary conditions and efforts. Among the different cases covered, this paper s...

The forging processes have usually been studied by analytical methods under simplifying assumptions such as the consideration of plane strain. Present work this study is approached from Upper Bound Theorem using the Triangular Rigid Zones model from a new approach, that is, through the analysis of Ring Compression Test, axisymmetric element under i...

In this paper a particularization of forging process is presented, studying the deformation of a ring specimen. Plastic forming is performed by means of the Upper Bound Theorem and the model of Triangular Rigid Blocks to calculate the minimal charge needed to deform the part. The establishing the part to deform an annular geometry is determined by...

Having established the best adaptation and solution offered by the modular model in previous studies, the current choice is based on the minimization of the p/2k dimensionless relation obtained in each model, analyzed under the same boundary conditions and efforts. This paper shows the study for the optimal choice of the geometric distribution of b...

In this paper the integrated implementation of the Manufacturing Engineering subject in all new engineering degrees at the University of Malaga is analyzed, within the European Higher Education Area (EHEA) framework. After identifying the methodology used by Department of Engineering Manufacturing Process and the problems generated in its developme...

The application of the Upper Bound Theorem (UBT) to plane strain forging processes using Triangular Rigid Blocks (TRB) is not a simple task when trying to adapt the blocks to different workpiece geometries. In this article, a modular procedure is proposed to obtain the best configuration of modules that determines the minimum value of required forc...

Present work applies the Upper-Bound Theorem (UBT) with Triangular Rigid Blocks (TRB) to metal forming compression processes like plane strain forge, offering an upper limit to required deformation energy. This analytical method, usually used by means of simplified models, is developed here incorporating different effects that impact in evolution o...

Present work develops the Triangular Rigid Blocks method (TRB) by means of the Upper Bound Element Technique (UBET) on indentation, a plastic deformation process. Boundary conditions of this process does not limit the vertical material flow in the opposite direction to the applied load, and the die-block has not effect on the entire top surface par...

Present work poses, from the methodological point of view, an approach to a case offorging by indentation by means of the application of the Upper Bound Element Technique(UBET), in his development of triangular rigid blocks (TRB). With two approaches of differentnature (Modulate and not Modulate), it tackles the study of the evolution of the necess...

En el presente trabajo se aplica el Teorema del Límite superior (TLS) a procesos de indentación, implementando el modelo de Bloques Rígidos Triangulares (BRT), con distribución Modular [1]. Se elaboran los diferentes hodógrafos correspondientes a un campo de velocidades cinemáticamente admisible, estudiándose la influencia de la incorporación del r...

En el presente trabajo se aplica el Teorema del Límite superior (TLS) a procesos de indentación, implementando el modelo de Bloques Rígidos Triangulares (BRT), con distribución Modular [1]. Se elaboran los diferentes hodógrafos correspondientes a un campo de velocidades cinemáticamente admisible, estudiándose la influencia de la incorporación del r...

This work proposes, from the methodological point of view, the application of the Upper Bound Theorem (UBT) to indentation processes, in his development of Triangular Rigid Blocks (TRB), using the Modular distribution. With two approaches of different kind of friction, Tresca (m) and Coulomb (μ) friction, different hodographs are present, correspon...

The implementation of virtual practices, to complement traditional practices has turned out to be an efficient tool to solve the classical problems occurring in the teaching of technological subjects, such as the manufacture engineering field. In the current work, the integration of virtual practice sets is analysed by means of an unified platform,...

Resumen La aplicación en procesos de forja del método analítico del Teorema del Límite Superior (TLS) mediante Bloques Rígidos Triangulares (BRT sección de la pieza a analizar. INTRODUCCIÓN La aplicación de la particularización geométrico-cinemática del Teorema del Límite Superior (TLS), conocida como modelo de Bloques Rígidos Triangulares (BRT) [1...

Present work is applied to the upper bound elemental technique (UBET) with the triangular rigid zones model in forging processes. This application allows incorporating different technological and geometrical parameters, not usually used at this analytic method. The strain hardening and the influence of the temperature are someone of these parameter...

In this work the results obtained with the virtualisation of manufacturing processes engineering practices at Malaga University are analyzed. This educative innovation tool allows to increase the efficiency of students learning because they can have available previously, by means of the computer, the different practise classes that they will do lat...

The present work applies the Upper Bound Theorem (UBT) to metalforming processes, concretely in plain strain forging, a non-stationary direct compression process. This method is developed by means of Triangular Rigid Blocks and it allows obtaining an upper limit to the required deformation energy. Usually, in plain strain condition, the UBT method...

In the present work, a comparison of the main criteria for rejecting atypical errors has been made, after characterizing the set of procedures that exist. The graphic treatment has made it possible to identify the evolution of the main statistics based on the distribution of the data, rectangular or normal, the number of aberrant values introduced...