Application feature model for geometrical specification of assemblies

The work begins with the description of a Domain Meta-Model for collaborative and integrated product development based on a Feature Model that aggregates all Application Features required to support domain specific reasoning. These Application Features are conceived as an aggregation of several Object Features containing all the knowledge about the structure and geometric interface that are the solution for a certain function. Afterwards, the Specification Feature, as a specialisation of the previous feature, is presented. This contains information about geometry, nominal and with defects, as well as about the relations established between them in the dimensional and geometrical specification process of an assembly, as established by GPS standard. Finally, the Specification Assembly Model is shown, an assembly model based on the Specification Feature and on the description of specifications using the Geospelling language

La ingeniería de producto : sus retos

Lliçó inaugural del curs 2004-2005

Ceramic Tile Design: a Case Study of Collaborative New-Product Development in Fashion-Driven Chains

This paper studies ceramic tile design chains, as representative of those collaborative New-Product Development (NPD) processes where the presence of very different origins of designs and the fast changes of the market strongly condition the process. We have studied this particular circumstance by way of what we have called the “stimulators and stimuli framework” that proved helpful to obtain computer supported NPD models for ceramic tile clusters.This work was partially supported by the Spanish Ministerio de Ciencia y Tecnología; Dirección General de Investigación under the Plan Nacional de I+D+i programme for Research Promotion (Project DPI2002_02141. CE- TILE). We also acknowledge the help given by Capgemini España S.L.U., TAU Cerámica S.A., Esmalglass S.A., Macer S.A. and Cerámica Kersa S.L

Managing mechanisms for collaborative new-product development in the ceramic tile design chain

This paper focuses on improving the management of New-Product Development (NPD) processes within the particular context of a cluster of enterprises that cooperate through a network of intra- and inter-firm relations. Ceramic tile design chains have certain singularities that condition the NPD process, such as the lack of a strong hierarchy, fashion pressure or the existence of different origins for NPD projects. We have studied these particular circumstances in order to tailor Product Life-cycle Management (PLM) tools and some other management mechanisms to fit suitable sectoral reference models. Special emphasis will be placed on PLM templates for structuring and standardizing projects, and also on the roles involved in the process.This work was partially supported by the Spanish Ministerio de Ciencia y Tecnología; Dirección General de Investigación under the Plan Nacional de I+D+i programme for Research Promotion (Project DPI2002_02141. CE-TILE). We also acknowledge the help given by Capgemini España S.L.U., TAU Cerámica S.A., Esmalglass S.A., Macer S.A. and Cerámica Kersa S.L. in the new ceramic product design and development pilot experience, which was carried out within the framework of the project

Process-oriented tolerancing using the extended stream of variation model

Current works on process-oriented tolerancing for multi-station manufacturing processes (MMPs) have been mainly focused on allocating fixture tolerances to ensure part quality specifications at a minimum manufacturing cost. Some works have also included fixture maintenance policies into the tolerance allocation problem since they are related to both manufacturing cost and final part qual- ity. However, there is a lack of incorporation of other factors that lead to increase of manufacturing cost and degrade of product quality, such as cutting-tool wear and machine-tool thermal state. The allocation of the admissible values of these process variables may be critical due to their impact on cutting-tool replacement and quality loss costs. In this paper, the process-oriented tolerancing is ex- panded based on the recently developed, extended stream of variation (SoV) model, which explicitly represents the influence of machining process variables in the variation propagation along MMPs. In addition, the probability distribution functions (pdf) for some machining process variables are ana- lyzed, and a procedure to derive part quality constraints according to GD&T specifications is also shown. With this modeling capability extension, a complete process-oriented tolerancing can be con- ducted, reaching a real minimum manufacturing cost. In order to demonstrate the advantage of the proposed methodology over a conventional method, a case study is analyzed in detail

Ontological model centered on resource capabilities for the inspection process planning

[EN] Planning of a manufacturing process is a knowledge-intensive task in which a lot of information/knowledge must be managed, especially to the most conceptual levels. One of these tasks that is realized at supervisor planning level, consists of the assignment and configuration of resources for each activity to execute. Decisions that must be based on the resource capabilities, which depend largely on resource configuration, so that they can ensure a good result. As it is well known, the ontological approaches have shown well positioned in these cases where knowledge management is needed, moreover, these approaches enable a shared conceptualization, which make it possible to implement process planning in a collaborative environment, particularly when they are accompanied by a methodology that facilitates their interpretation and use. In previous researches, a general ontology for modelling the resource capabilities involved in a process has been proposed. This ontology has been specialized in order to support the process planning task and a methodology supported on graphical representation for validating the configurations of resources assigned in a manufacturing process has been proposed. Based on these results, in this paper, an extended ontology for the inspection process planning is presented. This extension includes new types of activities (inspection activities) and new type of resources (inspection resources), and is centered on the dimensional and geometrical capabilities of the resources. Additionally, using the ontology semantics and the proposed methodology, an application for an inspection plan is developed. The inspection process planning case is focused on the preparation activities used for obtaining the configurations of the resources, since they largely determine the capabilities of the resulting resources. The application demonstrates the proficiency of the ontology to execute manufacturing planning and inspection planning in a dual form.Solano García, L.; Rosado Castellano, P.; Romero Subirón, F. (2017). Ontological model centered on resource capabilities for the inspection process planning. Journal of Manufacturing Technology Research. 8(3-4):115-133. http://hdl.handle.net/10251/116178S11513383-

Manufacturing variation models in multi-station machining systems

In product design and quality improvement fields, the development of reliable 3D machining variation models for multi-station machining processes is a key issue to estimate the resulting geometrical and dimensional quality of manufactured parts, generate robust process plans, eliminate downstream manufacturing problems, and reduce ramp-up times. In the literature, two main 3D machining variation models have been studied: the stream of variation model, oriented to product quality improvement (fault diagnosis, process planning evaluation and selection, etc.), and the model of the manufactured part, oriented to product and manufacturing design activities (manufacturing and product tolerance analysis and synthesis). This paper reviews the fundamentals of each model and describes step by step how to derive them using a simple case study. The paper analyzes both models and compares their main characteristics and applications. A discussion about the drawbacks and limitations of each model and some potential research lines in this field are also presented

Incorporation of form deviations into the matrix transformation method for tolerance analysis in assemblies

Comunicación presentada a MESIC 2019 8th Manufacturing Engineering Society International Conference (Madrid, 19-21 de Junio de 2019)Mathematical models for tolerance representation are used to assess how the geometrical variation of a specific component feature propagates along the assembly, so that tolerance analysis in assemblies can be carried out using a specific tolerance propagation method. Several methods for tolerance analysis have been proposed in the literature, being some of them implemented in CAD systems. All these methods require modelling the geometrical variations of the component surfaces: parametric models, variational models, DoF models, etc. One of the most commonly used models is the DoF model, which is employed in a number of tolerance analysis methods: Small Displacement Torsor (SDT), Technologically and Topologically Related Surfaces (TTRS), Matrix Transformation, Unified Jacobian–Torsor model. However, none of the DoF-based tolerance analysis methods incorporates the effect of form deviations. Among the non DoF-based methods, there are two that include form tolerances: the Vector Loop or Kinematic method and the Tolerance Map (T-Map) model, although the latter is still under development. In this work, a proposal to incorporate form deviations into the matrix transformation method for tolerance analysis in assemblies is developed using a geometrical variation model based on the DoF model. The proposal is evaluated applying it to a 2D case study with components that only have flat surfaces, but the proposal can be extrapolated to 3D cases

Design and implementation of a function block-based holonic control architecture for a new generation flexible manufacturing system

In this research work a control architecture which gives response to the requirements of new generation of flexible manufacturing systems in terms of flexibility, reconfigurability, robustness and autonomy is designed and implemented. To do so the main principles of the Holonic Manufacturing paradigm are applied using the IEC61499 function block (FB) technology. Unlike other similar research proposals, in this work FBs are not relegated to low-level control but are used to model manufacturing execution and control high-level control tasks. This is done with the objective of evaluating the viability of using FBs to develop holonic architectures in comparison to more established technologies like multi-agent systems. Moreover, the proposed control architecture also focuses on better integrating and exploiting the products’ information to enhance its flexibility and adaptability. For this STEP-NC (ISO14649) is used to model richer process plans which include manufacturing alternatives and could be easily integrated in the control itself

Metodología para el desarrollo de modelos de simulación ejecutables para sistemas de fabricación

In recent years, the adoption of the principles of Model Based Systems Engineering (MBSE) in the context of manufacturing systems has promoted the development of highly complex (hybrid simulations, multi-scale, multi-domain, ...) and high- fidelity simulations, some of them applicable even in real time (prototypes and virtual twins). The high complexity of modern manufacturing systems requires the use of well-founded methodologies to effectively and efficiently guide the definition, transformation and adjustment of the simulation models. However, few proposals address the definition of adequate methodologies for the manufacturing systems simulation. This work presents the methodology for Simulation Systems Modeling (SSM methodology), based on the synergistic use of SysML and Modelica. This methodology has been developed to support the construction of executable and multi-domain simulation models for complex manufacturing systems. In addition, a case study is presented, where this methodology is applied to define executable simulation models of a multi- stage assembly line that integrate geometric quality and productivity aspects. The results of this case study enable to compare different control logics, as well as to demonstrate the validity of the proposed methodology