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Explorative Study on Benchmarking Approaches for the Improvement of Corporate Greenhouse Gas Emissions

Explorative Study on Benchmarking Approaches for the Improve...

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technology and Entrepreneurship (ICTE), International Conference on

作者： Felix Budde Florian Kidschun Business Excellence Methods Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

Using traditional benchmarking methods on the environmental impact of enterprises, carbon benchmarking aims to enable organizations to compare their individual carbon footprint with their peers. The insights gathered during that process allows enterprises to identify areas for improvement and make informed decisions about their carbon emissions using best practices from their industry section. This paper presents a systematic study of carbon benchmarking approaches and methodologies for the assessment, performance comparison and improvement of corporate greenhouse gas emissions. In a first step, a series of robust criteria are defined in order to respond to the specific requirements of effective carbon benchmarking, aiming for comparable and reliable results. Secondly, existing frameworks and methodologies for the assessment and performance comparison of greenhouse gas emissions (GHG) are explored through a systematic literature review. In a last step, the approaches identified are compared and evaluated by comparison group and scope. In this context, potential gaps are identified and further need for research in the field of corporate GHG reduction methods and approaches revealed.

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Requirements for the Development of a Performance Management System with Consideration of Unforeseeable Business Process Variants 18th

Requirements for the Development of a Performance Management...

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18th Global Conference on Sustainable Manufacturing, GCSM 2022

作者： Teng, Yu-Min Ay, Sila Iyer, Rishabh Scholz, Julia-Anne Technische Universität Berlin Straße Des 17. Juni 135 Berlin10623 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783031288388

Supply chain issues arising from market turbulences force companies to find new solutions in the short term. Hence, deviations from the ideally designed business processes are inevitable, especially during production planning and control. These deviations result in unforeseen process variants. In addition, process steps of those process variants are often not completely conducted with IT systems and are therefore difficult to trace. Another underlying problem lies in the bias of performance measurement of process variants because each variant aligns with different goals and framework conditions. For these and other reasons, the performance management of process variants presents a challenge. To overcome this challenge, a serious game is being further developed in a research project. The goal is to provide trainings for performance management in a turbulent business environment with the serious game. It simulates the business processes and supply chain issues of a drilling machine manufacturer and serves as a use case for the research presented in this paper. The challenges associated with the performance management of unforeseeable business process variants are derived from the use case. A gap analysis is conducted between the challenges and existing requirements for the development of performance management systems. Based on this, adjustments are proposed to existing requirements and new requirements are being developed. © 2023, The Author(s).

关键词： Serious games

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Influence of superimposed low frequency oscillations on single-pass honing of long-chipping steel 6th

Influence of superimposed low frequency oscillations on sing...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Uhlmann, E. Rozek, A. Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute For Production Systems And Design Technology Ipk Pascalstr. 8-9 Berlin10587 Germany

Single-pass honing is used as a finishing process to meet high demands regarding form and dimensional accuracy of drilled bores. The disadvantages of single-pass honing compared to the conventional long-stroke honing are high process forces and torques as well as an increased risk of chip space clogging of the abrasive stones. A significant reduction in process forces and torques can be achieved by superimposing the axial movement with oscillations. In this work the kinematic basics of different oscillation parameters and their effects on single-pass honing of long-chipping steel are analyzed. It can be concluded that by superimposing low frequency oscillations in single-pass honing, the process forces and torques as well as the specific energy consumption can be reduced significantly without a decline in surface quality and form accuracy. © 2022 The Authors.

关键词： Honing

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Residual stress assessment during cutting tool lifetime of CVD-diamond coated indexable inserts 6th

Residual stress assessment during cutting tool lifetime of C...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Uhlmann, E. Hinzmann, D. Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute For Production Systems And Design Technology Ipk Pascalstr. 8-9 Berlin10587 Germany

Insufficient coating adhesion limits reproducibility regarding tool lifetime as well as workpiece quality during the application of CVD-diamond coated cutting tools. Depending on the combination of tungsten carbide substrate material, coating thickness as well as coating morphology, individual residual stress conditions exist within CVD-diamond coated cutting tool specifications. The application of these tools is accompanied by coating delamination as primary cutting tool failure. The tool lifetime of the respective cutting tool composition depends on the corresponding residual stress condition until crack development within the CVD-diamond coating initiates tool failure. During external cylindrical turning of hypereutectic aluminium silicon alloy AlSi17Cu4Mg-T6 the residual stress condition of a CVD-diamond coated cutting tool is assessed along the cutting edge, the rake face as well as flank face throughout the respective tool lifetime. Consequently, the progression of the residual stress condition until cutting tool failure regarding coating delamination is observed. During the tool lifetime of the investigated CVD-diamond cutting tools, compressive residual stress σR,c shifts to tensile residual stress σR,t underneath the cutting edge corner. The approximated residual stress difference of σR ≈ 5 GPa indicates stress peak relaxation processes, such as crack initiation, within the CVD-diamond coating. © 2022 The Authors.

关键词： Residual stresses

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Experimental investigations of the workpiece-media-interaction and the surface topography formation in centrifugal disc finishing 10

Experimental investigations of the workpiece-media-interacti...

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10th CIRP Global Web Conference on Material Aspects of Manufacturing Processes

作者： Kopp, Marco Uhlmann, Eckart Kneider, Christian Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

In this study the workpiece-media-interaction in centrifugal disc finishing is investigated using a miniaturised free movable force measuring system. Characteristics of the workpiece-media-interaction are derived and correlated with the surface topography formation of Ti-6Al-4V workpieces. As a result, it was found that characteristics of the workpiece-media-interaction such as the contact force between the media and the workpiece, the contact duration and the contact frequency are dependent on the type of media as well as the rotational speed of the disc. Consequently, both, the type of media as well as the rotational speed of the disc have an influence on the resulting surface roughness. © 2022 Elsevier B.V.. All rights reserved.

关键词： Topography

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Analysis of various graphite types for electrical discharge finishing 23

Analysis of various graphite types for electrical discharge ...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, E. Polte, M. Hocke, T. Thißen, K. Bolz, R. Streckenbach, J. Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781998999132

Nowadays graphite and copper are the most used tool electrode materials for electrical discharge machining (EDM). Especially for roughing operations to machine mould inserts made of steel, graphite allows high material removal rates, with high discharge energies and reduced relative tool wear. In addition, graphite is characterized by better machinability compared to copper, which leads to a cost-effective production of complex tool electrode geometries. To take advantage of the machinability and flexibility in producing complex tool electrode geometries, graphite is also used for EDM finishing. However, in EDM finishing, graphite shows still higher material removal rates but is also characterised by significantly higher relative tool wear compared to copper. This relative tool wear is fundamentally dependent on the material properties and the used process parameters. Therefore, this paper presents an approach for using graphite in EDM finishing operations. A parameter study was carried out using five different types of graphite to machine steel components. Within the investigations, different types of graphite with grain sizes in the range of 1.0 μm 11.0 %. Therefore, the experiments showed a great improvement regarding the relative tool wear for graphite. Ten additional graphite types will be used for further investigations to gain a deeper understanding of the tool wear mechanisms. This will enable the reliable and efficient application of graphite as a tool electrode material for EDM finishing. © 2023 Euspen Headquarters.

关键词： Cost effectiveness

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Increasing the Relative Density of Additively Manufactured Tungsten Carbide-Cobalt Tool Electrodes for EDM 38

Increasing the Relative Density of Additively Manufactured T...

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38th Annual Meeting of the American Society for Precision Engineering, ASPE 2023

作者： Uhlmann, Eckart Polte, Mitchel Hörl, Robert Reimann, Robert Braun, Thomas Hocke, Toni Technische Universität Berlin Institute for Machine Tools and Factory Management Berlin Germany Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

ISBN: (纸本)9781887706599

The investigation of novel materials for the use of tool electrodes for electrical discharge machining (EDM) is necessary to meet the increasing demands for complex products to be machined. Continuous product developments require improvements in manufacturing processes such as Sinking Electrical Discharge Machining (S-EDM). To meet these requirements, the development of customized EDM-processes and innovative tool designs is essential. Additive Manufacturing (AM) enables the production of sophisticated tool electrode geometries. This includes internal flushing channels for EDM-processes with minimal design constraints. Laser Powder Bed Fusion (LPBF) is a suitable method for this purpose. The presented paper shows an investigation to further increase the relative density ρrel of additively manufactured S-EDM tool electrodes using tungsten carbide-cobalt (WC-Co) as material for tool electrodes. © 2023 Proceedings - ASPE 2023 Annual Meeting. All rights reserved.

关键词： Electrodes

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Distributed real-time production control for resilient manufacturing systems 56

Distributed real-time production control for resilient manuf...

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56th CIRP International Conference on Manufacturing systems, CIRP CMS 2023

作者： Uhlmann, Eckart Polte, Julian Mühlich, Christopher Technische Universität Berlin Institute for Machine Tools and Factory Management IWF Pascalstraße 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany

To enable resilient manufacturing, production control systems must be able to adapt quickly and flexibly to unexpected changes. Motivated by Industrie 4.0, multi-agent systems offer a promising approach to meet these requirements. This paper presents a method for distributed production control that enables production entities to make optimal decisions regarding capacity utilization and the compliance of delivery dates in real-time despite disruptive events. Based on a multi-agent Markov Decision Process, production entities are modeled as autonomous software agents that can solve Flexible Job-Shop Problems through message passing. The performance of the proposed method is evaluated in a simulated production environment. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on Manufacturing systems 2023.

关键词： distributed production control Flexible Job-Shop Problem Industrie 4.0 multi-agent system resilient manufacturing systems

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Precise cutting of cemented carbide with nanopolycrystalline diamond in ductile regime 23

Precise cutting of cemented carbide with nanopolycrystalline...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, Eckart Polte, Mitchel Hocke, Toni Polte, Casey Polte, Julian Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

ISBN: (纸本)9781998999132

Today's demands on technical applications require the precise machining of high-performance materials. Cemented carbide is used as a wear-resistant material in a wide range of industrial applications, e.g. tool and mould making, mobility and medical engineering. Due to the brittle material characteristics and the resulting high hardness and wear resistance, the machining of the cemented carbide is severely limited. Long machining times and high tool wear are remaining challenges at state of the art. A novel approach for the machining of cemented carbide is the application of binderless nanopolycrystalline diamond (NPD) as cutting material for precise turning. Based on investigated fundamental cutting phenomena, within the scope of this work, the application of the novel cutting material was further investigated by comprehensive turning experiments. Turning tests were carried out with cemented carbide samples with a tungsten carbide content of CC = 88 %, a cobalt content of CCo = 12 % and a grain size of dg = 0.5 μm. Prior to the turning tests, the brittle-ductile transition as well as the minimum chip thickness were determined by dedicated spiral cutting tests as a function of the feed. In subsequent turning tests, the influence of the cutting speed, feed velocity and depth of cut were investigated. Process forces were evaluated and specimens were analysed regarding surface roughness and topography. In the course of the investigations, it could be shown that a dedicated set of process parameters enable cutting in ductile regime with great chip formation. Thus, the great potential of the novel cutting material NPD in turning of cemented carbide could be demonstrated. © 2023 Euspen Headquarters.

关键词： Turning

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PRECISION FINISHING OF ADDITIVE MANUFACTURED Ti-AI-COMPONENTS USING DIAMOND SLIDE BURNISHING

PRECISION FINISHING OF ADDITIVE MANUFACTURED Ti-AI-COMPONENT...

引用

2022 ASPE and euspen Summer Topical Meeting on Advancing Precision in Additive Manufacturing

作者： Polte, Julian Polte, Mitchel Lahoda, Christian Uhlmann, Eckart Fraunhofer Institute for Production Systems and Design Technology IPK Technische Universitat Berlin Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universitat Berlin Berlin Germany

ISBN: (纸本)9781713859192

Due to the increasing importance of lightweight design in terms of resource management, titanium aluminium (Ti-AI) alloys are gaining more and more significance. To fully exploit light weight design potentials additive manufacturing (AM) has the ability to shift state of the art product design towards maximised resource efficiency and physically minimized weight. Next to material standardization and qualification processes, major limitations for mass scale industrialization of additive manufacturing are high surface roughness values in a range of 5 μm ≤ Ra ≤ 15 urn and remaining tensile residual stress states. A promising approach to overcome these challenges shows a process chain consisting of near-net-shape laser powder bed fusion (LPBF) and subsequent finishing using a dedicate diamond slide burnishing (DSB) process [1]. Within this work plastic deformation induced by DSB and the effects on the workpiece material properties were investigated. Copyright© (2022) by American Society for Precision Engineering (ASPE) All rights reserved.

关键词： Surface roughness

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