Browsing Department of Mechanical Engineering & the Built Environment by Subjects
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Development of a STEP-compliant design and manufacturing framework for discrete sheet metal bend partsMetal sheets have the ability to be formed into nonstandard sizes and sections. Displacement-controlled computer numerical control press brakes are used for three-dimensional sheet metal forming. Although the subject of vendor neutral computer-aided technologies (computer-aided design, computer-aided process planning and computer-aided manufacturing) is widely researched for machined parts, research in the field of sheet metal parts is very sparse. Blank development from three-dimensional computer-aided design model depends on the bending tools geometry and metal sheet properties. Furthermore, generation and propagation of bending errors depend on individual bend sequences. Bend sequence planning is carried out to minimize bending errors, keeping in view the available tooling geometry and the sheet material properties’ variation. Research reported in this article attempts to develop a STEP-compliant, vendor neutral design and manufacturing framework for discrete sheet metal bend parts to provide a capability of bidirectional communication between design and manufacturing cycles. Proposed framework will facilitate the use of design information downstream at the manufacturing stage in the form of bending workplan, bending workingsteps and a feedback mechanism to the upstage product designer. In order to realize this vendor neutral framework, STEP (ISO 10303), AP203, AP207, and AP219 along with STEP-NC (ISO14649) have been used to provide a basis of vendor neutral data modeling.
Simulation aided life cycle sustainability assessment framework for manufacturing design and managementDecision making for sustainable manufacturing design and management requires critical considerations due to the complexity and partly conflicting issues of economic, social and environmental factors. Although there are tools capable of assessing the combination of one or two of the sustainability factors, the frameworks have not adequately integrated all the three factors. Case study and review of existing simulation applications also shows the approach lacks integration of the sustainability factors. In this paper we discussed the development of a simulation based framework for support of a holistic assessment of sustainable manufacturing design and management. To achieve this, a strategic approach is introduced to investigate the strengths and weaknesses of the existing decision supporting tools. Investigation reveals that Discrete Event Simulation (DES) can serve as a rock base for other Life Cycle Analysis frameworks. Simio-DES application optimizes systems for both economic and competitive advantage, Granta CES EduPack and SimaPro collate data for Material Flow Analysis and environmental Life Cycle Assessment, while social and stakeholders’ analysis is supported by Analytical Hierarchy Process, a Multi-Criteria Decision Analysis method. Such a common and integrated framework creates a platform for companies to build a computer simulation model of a real system and assess the impact of alternative solutions before implementing a chosen solution.
Sustainable manufacturing assessment: Approach and the trend towards life cycle sustainability analysisRecently, Life Cycle Sustainability Assessment framework has been launched for experts from different disciplinary fields to discuss and develop a holistic and integrated approach that supports effective sustainability decisions. Many authors have used different and combination of methodologies in support of this goal; some authors focus on competitive manufacturing with integrated environmental protection elements, some focus on energy and resource efficient technologies and eco-designs while other authors underscored the importance of holistic assessment of the three sustainability factors to drive effective sustainable manufacturing. However, it is evidence from the research that the existing approaches lack holistic and analytical approach that consolidates the objectives of other sustainable product development methods. This paper used a structured approach to a literature review to systematically examine sustainable manufacturing approach and the move from segmented assessment methods to the holistic and integrated Life Cycle Sustainability Analysis, and identify gaps both in practice and research within the manufacturing industry domain. In view of the result, the research proposed a framework that integrates goals that support progressive sustainable product development with methods that focus on the holistic quantitative analysis of the manufacturing production process.