Modeling and analysis of surface roughness in fused deposition modeling based on infill patterns

92-99This paper presents an approach of modeling for surface roughness of Polylactic Acid (PLA) polymer components printed with Fused Deposition Modeling (FDM) based Additive Manufacturing (AM) process. With additive manufacturing technology one can build the components of metal, polymers and variety of composites with good dimensional accuracy. FDM is one of the additive manufacturing process which is used to build products of various polymers. In this investigation PLA components are built using FDM with different Infill Patterns viz. Zigzag, Triangles and Gyroid. Based on surface roughness measurement of components, predictive mathematical models for surface roughness are generated for different infill patterns. The analysis of surface roughness based on layer thickness and infill pattern is presented. The error between predictive surface roughness and experimental surface roughness ranges between 0.1 to 9.5%. For this investigation Gyroid infill pattern shows favourable results for surface roughness. The workable ranges for process parameter under investigation are infill percentage of 70 to 90 %, layer thickness of 0.2 to 0.22 mm and printing speed of 70 to 90 mm/s

Improvement proposal for the logistics process of importing SMEs in Peru through lean, inventories, and change management

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.The logistics processes of companies seek an adequate supply of merchandize, streamline processes, reduce costs, and distribution of their products to the customer in an efficient manner and allow them to develop corrective planning in order to be competitive in the market. However, these processes are less efficient in importing companies of the SME sector. Therefore, this article proposes the application of a change management model to improve the logistics process that generates a real transformation. This model is structured in three phases: first, pre-Implementation, which refers to participatory leadership and resistance to change; second, implementation of logistics management; and third, sustainability of the model over time. The model was validated in a Peruvian SME importer of household goods, whose satisfactory results implied an increase in available storage capacity, reduction of logistics costs, satisfaction of change, and organizational culture

Productivity increase in a cellular battery line using lean kaizen and tools

Companies striving to compete in the market place, use many lean techniques to advance production and seek to achieve lower costs and higher competitiveness. The application of the Kaizen methodology, enticing a group of professionals to observe and analyze a problem, forward improvement suggestions and apply them, creates a new state on which further enhancements can be made. Together with the utilization of brainstorming and chrono-analysis tools, opportunities are identified and technically support the project. The work focused on a 5-week review of one manufacturing line that each day produced 833/h. Cylinder lithium cell batteries for mobile phone application. Yearly cost reduction of $15,000, with minimal$1.374 investment was achieved, resulting in 52.59% cycle time improvement.This work has been supported by FCT-Fundacao para a Ciencia e Tecnologia within the Project Scope (UID/CEC/00319/2019)

Application of lean manufacturing techniques to increase on-time deliveries: Case study of a metalworking company with a make-to-order environment in Peru

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.The purpose of this paper is to provide a proposal of a production management model using lean manufacturing techniques to improve on-time deliveries of a metal-mechanic company that works in a make-to-order (MTO) manufacture of industrial fans environment. The proposal of the research refers to the implementation of a production management model in a metal mechanic company in Peru and analyze the effect in on-time delivery rate of the company. In one month of operation after the implementation of the pro-posed model, the on-time delivery rate of the company increased from 35% to 80%. Likewise, the problems present in the metalworking research company may be the same in many metalworking companies in the country, so the present investigation will serve as an example for the possible solution of the problems of other companies

Implementation challenges affecting the environmental improvement performance in pharmaceutical production: Results of a green kaizen pilot

This paper reports on working findings in an action research-based project, implementing a green kaizen pilot in a European pharmaceutical manufacturing company. The aim of the study is to investigate how continuous improvement initiatives with focus on environment originally developed for the automotive manufacturing industry could apply to the pharmaceutical industry. It also aspires to understand the enabling and hindering issues are for such implementation. There are considerable similarities of implementing lean in general in the two sectors, however, some key differences and challenges were apparent when implementing this specific green kaizen method called Green Performance Map. An implication for pharma practitioners implementing the green kaizen method concerns how to improve working procedures and production equipment to become more environmentally friendly amid high regulatory demands on process quality. Implementation challenges are discussed in terms of fidelity, locus and extensiveness of lean practices implementation

Implementing lean production to promote textile and clothing industry sustainability

Traditionally, Textile and Clothing industry (TCI) is an industry that naturally consumes large amounts of natural resources (e.g. natural fibers, natural dyes, water and energy) and release chemicals into the atmosphere, water and soil. Lean Production (LP) is an organizational methodology which main key idea is "doing more with less". A fundamental difficulty faced by the TCI stakeholders has been in finding out how to implement this methodology efficiently in a sustainable way. Concerned about this problem, a methodology to support the implementation of LP in the TCI, named PESO was developed. This methodology is based on four dimensions: People, Ergonomics, Sustainability and Operational performance (PESO).By including sustainability as a dimension to be taken into account, it is expected to develop and create a natural awareness to consume less. Today in TCI there is a growing concern with sustainability, as shown by the increase in the number of research projects related with this issue. This chapter aims to highlight these developed and developing projects to the light of the Sustainability dimension of the PESO methodology. These were analyzed and discussed to illustrate that though these do not directly address Lean, allied with it could enable sustainability of their production system and processes. This is embedded in the synergy between LP and sustainability, also entitled Lean-Green. By doing this, TCI is on the road to achieve the sustainable development goals, directly, the goal 12, responsible consumption and production.- (undefined

Lean and TRIZ: from the problems to creative and sustainable solutions

Lean Thinking philosophy pursuit continuous improvement and continuous innovation towards economic and eco-sustainable growth by new solutions. Such solutions involve eco-efficient products (goods and/or services) and cleaner production to produce them. Nevertheless, sometimes, there are technical contradictions that inhibited companies to achieve good solutions. TRIZ is a methodology capable to solve such contradictions and Lean could use it. Lean and TRIZ are on the road to achieve sustainable development goals, directly, the Goal 12, responsible consumption and production. This paper presents some case studies where this alliance is recognized and credited. These case studies were collected and synthetized by: type of work developed, company/sector, main TRIZ and Lean principles and tools used, problem(s) to solve and products/solutions designed. Building on the results, the authors systematized that Lean and TRIZ impact the design of creative solutions. Many of such solutions were developed in students’ master dissertations that reveals the importance of teaching Lean allied with TRIZ.FCT - Fundação para a Ciência e a Tecnologia (UID/CEC/00319/2019