| 1. |
- Bonilla Hernández, Ana Esther, et al.
(författare)
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Energy and Cost Estimation of a Feature-based Machining Operation on HRSA
- 2017
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Ingår i: Procedia CIRP. - : Elsevier BV. - 2212-8271 .- 2212-8271. ; 61:Supplement C, s. 511-516
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Tidskriftsartikel (refereegranskat)abstract
- Forward-looking manufacturing companies aim for sustainable production with low environmental footprint. This is true also for aerospace engine-makers, although their environmental impact mostly occurs during the use-phase of their products. Materials, such as Nickel alloys, are used for special applications where other materials will not withstand tough working conditions in terms of pressure and temperature. Heat Resistant Super Alloys are, however, considered difficult to machine and cutting tools will wear off rapidly. In this paper, a simple way to estimate the energy required, the cost and environmental footprint to produce a work piece using standard engineering software is presented. The results show that for a hypothetical 3 tonne work piece, Inconel 718 will be considerably cheaper and require less water but will require more energy, and has considerably larger CO2 footprint than Waspaloy.
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| 2. |
- Bonilla Hernández, Ana Esther
(författare)
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On cutting tool resource management
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The search for increased productivity and cost reduction in machining can be interpreted as desire to increase the Material Removal Rate, , and maximize the cutting tool utilization. The CNC process is complex and involves numerous constraints and parameters; ranging from tolerances to machinability. A well-managed preparation process creates the foundation for achieving a reduction in manufacturing errors and machining time. Along the preparation process of the NC-program, two different studies have been performed and are presented in this thesis. One study examined the CAM programming process from the Lean perspective. The other study includes an evaluation of how the cutting tools are used in terms of and tool utilization. Two distinct combinations of cutting data might provide the same . However, the tool life and machining cost can be different. Therefore, selection of appropriate cutting parameters that best meet all these objectives is challenging. An algorithm for analysis and efficient selection of cutting data for maximal , maximal tool utilization and minimal machining cost has been developed and is presented in this work. The presented algorithm shortens the time dedicated to the optimized cutting data selection and the needed iterations along the program development. Furthermore, the objectives that need to be considered during the estimation of the manufacturing processes sustainability have been identified. In addition, this thesis also includes a theoretical study to estimate energy use, CO2-footprint and water consumption during the manufacture of a workpiece, which can be invaluable for companies in their search for sustainability of their manufacturing processes.
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| 3. |
- Bonilla Hernández, Ana Esther, et al.
(författare)
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Process sustainability evaluation for manufacturing of a component with the 6R application
- 2019
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Ingår i: Procedia Manufacturing. - : Elsevier BV. - 2351-9789. ; 33, s. 546-553
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Tidskriftsartikel (refereegranskat)abstract
- Sustainability in manufacturing can be evaluated at product, process and system levels. The 6R methodology for sustainability enhancement in manufacturing processes includes: reduced use of materials, energy, water and other resources; reusing of products/components; recovery and recycling of materials/components; remanufacturing of products; and redesigning of products to utilize recovered materials/resources. Although manufacturing processes can be evaluated by their productivity, quality and cost, process sustainability assessment makes it a complete evaluation. This paper presents a 6R-based evaluation method for sustainable manufacturing in terms of specific metrics within six major metrics clusters: environmental impact, energy consumption, waste management, cost, resource utilization and society/personnel health/operational safety. Manufacturing processes such as casting, welding, turning, milling, drilling, grinding, etc., can be evaluated using this methodology. A case study for machining processes is presented as an example based on the proposed metrics. © 2019 The Authors. Published by Elsevier B.V.
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| 4. |
- Fredriksson, Claes, 1964-
(författare)
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Integrating Materials and Manufacturing Education
- 2021
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Ingår i: ASEE Annual Conference and Exposition, Conference Proceedings. - : American Society for Engineering Education.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The Material Science Tetrahedron, which is sometimes used to define the scope of this subject, connects the concepts of material processing, microstructure, material properties and performance of the material in applications. This model can be the foundation for discussing with students the impact of manufacturing processes to materials, such as heat treatments and consequences of welding or machining to the microstructure of metals as well as the effects of laser melting or sintering to additively manufactured (AM) components. On the other hand, it also indicates that material properties play an important role in determining manufacturing parameters, such as material removal rates or tool wear rates in machining. The EduPack educational software was developed as the first computer-based materials teaching resource at the Engineering department of Cambridge University. It consists of two linked databases - one of materials properties (MaterialUniverse) and one of manufacturing processes (ProcessUniverse). This is an ideal platform for cross-disciplinary teaching, not only for materials and manufacturing subjects, but the embedded tools also support all types of engineering design and product development courses; including materials and process selection as well as environmental and sustainability assessment of products. The two main databases contain around 4000 materials and 250 manufacturing processes, respectively, with informative images and schematics facilitating understanding. An extensive number of comparable properties are given in individual datasheets. All these properties are possible to visualize in colourful charts (Ashby charts) that provide good overviews and a good basis for understanding and decision-making. In this paper, relevant educational examples are shown that integrates materials with manufacturing in a natural way.
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| 5. |
- Fredriksson, Claes, 1964-
(författare)
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Sustainability of metal powder additive manufacturing
- 2019
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Ingår i: Procedia Manufacturing. - : Elsevier BV. - 2351-9789. ; 33, s. 139-144
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Tidskriftsartikel (refereegranskat)abstract
- Additive manufacturing, or 3D-printing, has attracted attention and raised expectations regarding future production and repair of parts, for example, in the aerospace industry. Various techniques have been utilized to deposit metal alloys for components. It has been suggested that this may offer great benefits in terms of sustainability, in particular, new opportunities for lightweighting. There are, however, outstanding questions about sustainability benefits outside of the use phase. In this paper, the material and manufacturing life-cycle stages were investigated for details produced using INCONEL 718. Energy measurements from an ARCAM A2X Electron Beam Melting system are presented and compared to the embodied energy and indirect CO2-emissions of the feedstock as well as to traditional subtractive manufacturing. It is found that both the metal powder production and the additive manufacturing process itself contribute considerably to total energy use and emissions. Ashby’s 5-step method for assessment of sustainable development is used to briefly discuss economic and social implications of additive manufacturing. © 2019 The Authors. Published by Elsevier B.V.
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| 6. |
- Galos, Joel, et al.
(författare)
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Multifunctional sandwich panel design with lithium-ion polymer batteries
- 2021
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Ingår i: Journal of Sandwich Structures and Materials. - : SAGE Publications. - 1099-6362 .- 1530-7972. ; 23:8, s. 3794-3813
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Tidskriftsartikel (refereegranskat)abstract
- This paper investigates the mechanical properties of lithium-ion polymer (LiPo) batteries and their subsequent use in the design of multifunctional sandwich panels for automotive applications. Shear properties, flexural properties and compression properties of prismatic pouch LiPo batteries are determined experimentally through a hole-punch test, a three-point bending test and an in-plane compression test, respectively. This study is the first to characterize the shear properties of a lithium-ion battery, which are critical in sandwich panel design. The mechanical properties of the batteries obtained are then applied to existing analytical models of multifunctional sandwich panels consisting of carbon fibre composite facesheets and LiPo battery cores, which are currently being considered for use in automotive panel design. A material selection procedure for a stiffness-limited automotive car door panel subjected to bending shows that a trade-off between mechanical performance and cost can be achieved by using a composite sandwich panel with thin LiPo battery cores or by embedding larger LiPo batteries in lower-density polymer foam cores. The practicality and implementation aspects of using sandwich composites with LiPo battery cores in automotive design are also discussed.
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