检索结果-内蒙古大学图书馆

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

作者： Uhlmann, E. Polte, M. Hocke, T. Thißen, K. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9781998999132

Ultra-precision machining is a crucial manufacturing process for the production of optical components in automotive, medical and aerospace industry and enables high dimensional accuracies and low surface roughness values. Dedicated single crystal diamond tools enable the manufacturing of optical and functional surfaces such as mirrors or lenses. Despite the high mechanical hardness, temperature induced chemical wear of the diamond tools occures during the process. To characterise und interpret the wear behaviour of diamond tools, the cutting temperature needs to be analysed. At state of the art, there are no precise methods available for analysing temperatures in the cutting zone of a single crystal diamond tool in order to identify the wear behaviour online during the process. Therefore, a dedicated measurement system based on boron-doped CVD single crystal diamonds as temperature sensor was developed. The electrosensory features of the fully boron-doped diamonds enable a direct temperature measurement in the cutting zone. To enable high sensitive temperature measurements, ion-implantation was used for partial and specific boron-doping close to the cutting edge of single crystal diamonds. To fundamentally evaluate the quality of the doping and contacting structures as well as the general process of the ion-implantation three different doping structures were investigated using single crystal diamond blanks prior doping the cutting tools. For this purpose, the boron-doped structures were optically characterised and the correlations between the resistances and the temperatures were evaluated as a function of different doping-levels and doping-lengths. First results show the successful application of the ion-implantation for boron-doping of single crystal diamonds. It could be proven that the selected boron-levels as well as boron-lengths lead to different initial conditions of the analysed specimens. Dedicated ionimplantation of single crystal diamond tools represents

关键词： Surface roughness

来源：评论

学校读者我要写书评

暂无评论

Wear mechanism of single crystal diamonds in ultra-precision cutting of graphite for air bearing applications 23

Wear mechanism of single crystal diamonds in ultra-precision...

引用

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

作者： Uhlmann, E. Polte, M. Hocke, T. Felder, F. Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany

ISBN: (纸本)9781998999132

In order to meet the continuously increasing function-determining requirements of complex precision components, advances in machine tool components are necessary in addition to technological developments. In this context, motorized spindles in particular show great potential for enabling further increases in accuracy. To achieve high stiffness and damping behaviour of spindle systems, aerostatic bearings made of graphite with bearing gaps Sg S ≤ 1 μm are necessary. Regarding the state of the art, uncoated tungsten carbide tools, diamond coated carbide tools and thick film chemical vapour deposition (CVD) diamonds are used for cutting graphite materials. Cutting with these tools leads to asymmetric breakout behaviour of the graphite grains as well as high tool wear during machining, resulting in insufficient shape accuracies and surface qualities. A promising approach to overcome the current challenges for aerostatic bearing components made of graphite is the use of single crystal diamonds (SCD) with characteristic low rounded cutting edge radii rß ≤ 20 nm as well as cutting-edge waviness wa ≤ 200 nm. Besides the material-specific properties of the SCD, tool wear occurs during the cutting of graphite. For this purpose, the abrasive wear mechanism and surface attrition of SCD were analysed concerning specific blasting tests with defined time intervals of 60 s ≤ tb ≤ 3,000 s and different process conditions. Furthermore, two types of graphite granulate with grain sizes in a range of 200 μm ≤ gs ≤ 400 μm were used. First results show a dimensional loss of material on the investigated specimens made of SCD depending on the process conditions, whereby an influence of the surface attrition could be proven. © 2023 Euspen Headquarters.

关键词： Graphite

来源：评论

学校读者我要写书评

暂无评论

DEM simulation of centrifugal disc finishing using smoothed particle hydrodynamics 23

DEM simulation of centrifugal disc finishing using smoothed ...

引用

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

作者： Uhlmann, E. Polte, J. Kuche, Y. Hocke, T. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany

ISBN: (纸本)9781998999132

Centrifugal disc finishing is a widely used technology forserial post-processing of small components made of various materials. During the process, the workpieces are completely surrounded by dry or moist abrasive media, making it difficult to obtain precise information about particle contacts or the movement of the workpieces. Numerical analysis through the discrete element method (DEM) has the potential to improve the understanding of the process, but the accurate representation of moist particles with varying contact conditions remains a challenge. This paper compares different contact models using the ROCKY DEM software, including the liquid-bridge model and the smoothed particle hydrodynamics (SPH) model. The analysis indicates that, compared to other models, SPH demonstrates clear advantages in representing process water flow and is better suited for cases with higher water content in the medium. © 2023 Euspen Headquarters.

关键词： Finite difference method

来源：评论

学校读者我要写书评

暂无评论

Post-Processing of Additive Manufactured Medical Metal Parts 11

Post-Processing of Additive Manufactured Medical Metal Parts

引用

11th ASPE-euspen Summer Topical Meeting on Advancing Precision in Additive Manufacturing

作者： Uhlmann, Eckart Polte, Julian Hocke, Toni Al-Sanhani, Ghamdan Lahoda, Christian Institute for Production Systems and Design Technology IPK Technische Universität Berlin Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Berlin Germany

来源：评论

学校读者我要写书评

暂无评论

DEM Simulation of Abrasive Brushing Processes on Additively Manufactured Workpieces 20

DEM Simulation of Abrasive Brushing Processes on Additively ...

引用

20th CIRP Conference on Modeling of Machining Operations in Mons, CIRP CMMO 2025

作者： Hoyer, Anton Uhlmann, Eckart Technische Universität Berlin Pascalstr. 8-9 Berlin10587 Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 Berlin10587 Germany

Brushing with bonded abrasives is a finishing process mainly used for deburring, edge rounding, and surface roughness reduction. The brushing tools consist of flexible polymer filaments embedded with abrasive grains, allowing them to adapt to complex workpiece shapes. However, interactions between filaments lead to complex motion, chipping, and wear behaviors, making it difficult to predict work results. The discrete element method (DEM) has been shown to be effective in simulating process forces, contact areas, and filament interactions on flat workpieces. Consequently, this article focuses on processing geometrically complex workpieces, particularly additively manufactured turbine fan blades (Ni-Cr-Co), using round brushes with bonded silicon carbide. First, a vectorized iterative method is introduced to generate artificial filament patterns, enhancing DEM simulation accuracy compared to state-of-the-art filament pattern models. Subsequently, dry brushing experiments are carried out on a fan blade feature demonstrator, aiming to achieve homogeneous roughness reduction. The qualitative analysis of the contact surface suggests that results from DEM simulations can reduce the need for costly technological investigations and prototypes. © 2025 The Author(s).

关键词： Nickel alloys

来源：评论

学校读者我要写书评

暂无评论

EXTENDED STUDY ON THE COMPOSITION OF MAGNETORHEOLOGICAL FLUIDS FOR THE POST-PROCESSING OF MICRO-MILLING TOOLS 39

EXTENDED STUDY ON THE COMPOSITION OF MAGNETORHEOLOGICAL FLUI...

引用

39th Annual Meeting of the American Society for Precision Engineering, ASPE 2024

作者： Sordon, Fabian Lahoda, Christian Polte, Mitchel Uhlmann, Eckart Maas, Jürgen Mechatronic Systems Lab EMK Technische Universität Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany

ISBN: (纸本)9781887706612

Cutting edge preparation is a critical step in the fabrication of micro-milling tools, helping to remove grain chipping and to reduce tool wear. In our previous research, we explored the use of magnetorheological fluids for directed immersed tumbling under magnetic excitation, demonstrating its potential through significant and precise material removal rates and reduced processing times. This study expands on that work by examining how the composition of the abrasive magnetorheological fluid affects surface quality and the long-term performance of the fluid. Various compositions of magnetorheological fluid samples were tested on high-speed steel specimens using a custom-designed test bench, which enables the variation of the magnetic field. The microgeometry of the cutting edges, including the maximum chipping, was recorded before and after processing. Results indicate that compositions yielding larger abrasive particles, combined with high magnetic and abrasive particle volume fractions lead to improvements in surface quality and material removal rate. © 2024 Proceedings - ASPE 2024 Annual Meeting. All rights reserved.

关键词： Magnetorheological fluids

来源：评论

学校读者我要写书评

暂无评论

technology Radar for a Sustainable Biological Transformation in the Manufacturing Industry 19th

Technology Radar for a Sustainable Biological Transformation...

引用

19th Global Conference on Sustainable Manufacturing, GCSM 2023

作者： Mügge, Janine Berkhahn, Magda Knauf, Tobias Stark, Rainer Faßbender, Lynn Lange, Annika Riedelsheimer, Theresa Lindow, Kai Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany Technische Universität Berlin Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783031774287

Bio-inspired, bio-integrated, bio-intelligent product and production systems are new research approaches aimed at achieving sustainability in manufacturing. For the industrial application of new technological solutions, it is crucial to convey their added value from not only an economic but also an environmental perspective. The evaluation of their technological readiness plays an important role in implementation. This paper presents a technology radar developed and evaluated within German research project BioFusion 4.0 involving 13 industry and research partners. The paper outlines the development approach and its application by means of three technological examples. The technologies are categorized and assessed using four significant attributes of an effective biological transformation: (1) the mode of action (bio-inspiration, bio-integration, and bio-interaction);(2) the transformative character and (3), the technology—and (4) Sustainability Readiness Level. The technology radar comprises a step-by-step procedure to assess a technology by each criterion to enable different stakeholders, such as production planners or product developers to evaluate and identify suitable technologies according to their needs and business strategy. The application of the technology radar is demonstrated on the exemplary technologies of a digital twin with integrated life-cycle assessment, situation awareness monitor for networked production systems and bio-based 3D printing. © The Author(s) 2025.

关键词： Biotic

来源：评论

学校读者我要写书评

暂无评论

Corporate Climate Protection Measures to Improve the Carbon Footprint in production: A Systematic Development of a Toolbox with Climate Protection Actions for the Reduction of Greenhouse Gas Emissions in Small and Medium-Sized Enterprises 19th

Corporate Climate Protection Measures to Improve the Carbon ...

引用

19th Global Conference on Sustainable Manufacturing, GCSM 2023

作者： Budde, Felix Kohl, Holger Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany Technische Universität Berlin Pascalstraße 8-9 Berlin10587 Germany

ISBN: (纸本)9783031774287

Individual climate protection measures are already being successfully implemented by many companies. But often, there is a lack of comprehensive information for selecting and implementing the right measures that fit the individual company’s emissions profile. This paper presents the systematic development of a toolbox of climate protection actions for small and medium-sized enterprises in order to reduce greenhouse gas emissions. The development process followed a four-step methodological approach: conducting intensive research on climate protection measures in applied and practical literature, reducing and grouping the measures into their corresponding emission categories, structuring and categorizing the measures into specific types of areas, and providing detailed profiles and descriptions of each measure. The resulting list of climate protection actions follows underlying basic principles (i.e. improvement of the emission factor, reduction of emission-generating activities and behavioral changes) which allow an individual derivation of measures. In its final version, the toolbox provides small and medium-sized enterprises with a comprehensive and accessible resource for identifying and implementing effective climate protection actions according to their emissions profile. © The Author(s) 2025.

关键词： Greenhouse gas emissions

来源：评论

学校读者我要写书评

暂无评论

Planning of Time-Efficient Trajectories for Mobile Robots with Differential-Drives

Planning of Time-Efficient Trajectories for Mobile Robots wi...

引用

International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Philipp Lelidis Axel Vick Production Machinery and Equipment Management Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany Process Automation and Robotics Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

ISBN: (数字)9798350361230

ISBN: (纸本)9798350361247

To effectively utilize the capacities of the production facilities, flexible and fast transport, and manipulation technology is essential. Current path planning methods use simple paths without exploiting the physical limitations of mobile robots. This paper deals with the time-efficient kinematic planning of path and velocity trajectories for autonomous mobile robots equipped with a differential-drive, used to load and unload machine tools. For a close parking position next to the machine tools, the mobile robot must approach practically straight without the necessity of turning at the end. After a brief definition of the kinematics of a mobile robot with nonholonomic constraints, a Bezier-curve is combined with multiple jerk-limited velocity trajectories considering the initial and final state as well as the physical limitations. For a time-efficient acceleration and deceleration the maximum acceleration of the mobile robot is used and differentiated into the radial and tangential acceleration. This allows a quickly reached close parking pose next to a machine tool. The algorithm is tested with simulations in RVIZ in combination with Gazebo and ROS2 as well as with the real mobile robot Tend-o-Bot.

关键词： Kinematics Turning production facilities Trajectory Planning Machine tools Mobile robots Manufacturing automation Load modeling Autonomous robots

来源：评论

学校读者我要写书评

暂无评论

Developing Digital Twins for energy efficiency in the production phase of products

引用

Procedia CIRP 2024年 122卷 933-938页

作者： Sebastian Wehking Theresa Riedelsheimer Cansu Tanrikulu Kai Lindow Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10587 Berlin Germany

The relevance of digital solutions to enable sustainable value creation, the monitoring and ultimately the reduction of the environmental footprint has increased. New information technologies and increased data availability along a product's lifecycle offer more tools to assess product sustainability than ever before. This paper presents how a Digital Twin needs to be designed to help monitor product-level energy efficiency and how such a Digital Twin can be implemented. State-of-the-art research on Digital Twins and their development, lifecycle assessment, and energy efficiency are introduced. There is a lack of evaluated implementations of methodical DT development in different scenarios, especially for the evaluation of product-level energy efficiency during production. Results of a research project with the focus on the development and implementation of Digital Twins are presented. The use case is set within the scenario of the sequential development of a product simultaneously with the development of the Digital Twin. The focus is put on the implementation of an energy consumption prediction and product carbon footprint analytics module as part of the Digital Twin. The development approach is presented and recommendations for the development of future Digital Twins are derived.

关键词： Digital Twins Sustainability Lifecycle Assessment Energy efficiency

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：