检索结果-内蒙古大学图书馆

32nd CIRP Design Conference, CIRP Design 2022

作者： Guenther, Robin Beckschulte, Sebastian Wende, Martin Mende, Hendrik Schmitt, Robert H. Laboratory For Machine Tools And Production Engineering Wzl Of Rwth University Campus-Boulevard 30 Aachen52074 Germany Fraunhofer Institute For Production Technology Ipt Steinbachstraße 17 Aachen52074 Germany

This paper describes an artificial intelligence (AI) based failure management approach across the value chain for the commercial vehicle industry by integrating and utilizing lifecycle data for product and production optimization. The amount of available data throughout a product lifecycle has increased significantly in previous years, primarily driven by the development and deployment of cyber-physical systems. While data from a single entity in the value chain already enables failure management-related analysis and services, including AI-based methods such as predictive maintenance, there remains a lack of systematic approaches to utilize data across the entire value chain. This paper proposes an AI-based failure management approach, which relies on integrating a variety of diverse data sources along the value chain. At first, three so-called application areas were defined: process and product optimization, availability optimization, and performance optimization. Consequently, practice-relevant use cases are identified for each area, for which it is shown how failures in the value chain can be proactively eliminated with the support of AI. Methods for predictive analytics are adapted for cross-value chain failure management to derive correlations between different stages of the production process and product usage. Based on these results and human expert knowledge, proactive measures are recommended by a decision support system (DSS) to resolve failures before arising. The commercial vehicle industry serves as an overarching validation case study for the practice-relevant verification of the targeted applications. The paper gives an outlook on the envisaged research work for the realization of holistic failure management. © 2022 The Authors.

关键词： Failure analysis

来源：评论

学校读者我要写书评

暂无评论

machine learning-based predictions of form accuracy for curved thin glass by vacuum assisted hot forming process 18

Machine learning-based predictions of form accuracy for curv...

引用

18th IMEKO TC10 Conference on Measurement for Diagnostic, Optimisation and Control to Support Sustainability and Resilience 2022

作者： Vogel, Paul-Alexander Vu, Anh Tuan Mende, Hendrik Gulati, Shrey Grunwald, Tim Schmitt, Robert H. Bergs, Thomas Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 Aachen52074 Germany Laboratory for Machine Tools and Production Engineering WZL of RWTH University Campus-Boulevard 30 Aachen52074 Germany

ISBN: (纸本)9781713870241

Thin glass is applied in numerous applications, appearing as three-dimensional smartphone covers, displays, and in thin batteries. Nonisothermal glass molding has been developed as a hot forming technology that enables to fulfil demands of high quality yet low-cost production. However, finding optimal parameters to a new product variant or glass material is highly demanding. Accordingly, manufacturers are striving for efficient and agile solutions that enable quick adaptations to the process. In this work, we demonstrate that machine learning (ML) can be utilized as a robust and reliable approach. ML-models capable of predicting form shapes of thin glass produced by vacuum-assisted glass molding were developed. Three types of input data were considered: set parameters, sensor values as time series, and thermographic in-process images of products. Different ML-algorithms were implemented, evaluated, and compared to reveal random forest and gradient boosting regressors as best performing on the first frame of the thermographic images. © IMEKO TC10 Conference on Measurement for Diagnostic, Optimisation and Control to Support Sustainability and Resilience *** rights reserved

关键词： machine learning

来源：评论

学校读者我要写书评

暂无评论

Examination of the variance in human pathways in HRC with heavy duty-robots for safe process planning 13

Examination of the variance in human pathways in HRC with he...

引用

13th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2019

作者： Bdiwi, Mohamad Harsch, Ann-Kathrin Reindel, Paul Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainerstr. 88 Chemnitz09126 Germany

Compared to robots, human pathways are individually changeable. Particularly the human-robot-collaboration (HRC) with heavy-duty robots carry high risk potentials. To ensure safety and efficiency, the human variance in pathways should be determined in the planning of HRC. Hence this paper presents a method to investigate human pathway variations in a real study. In systematically selected tasks, human pathways are examined for 100 participants in manual and human-robot collaboration (HRC) scenarios. As a result, the variations of pathways are presented depending on various features: in nearly all cases the variance of women's walking pathways is smaller than that of men. © 2020 The Authors.

关键词： Robot programming

来源：评论

学校读者我要写书评

暂无评论

Automated design of product-flexible car body fixtures with software-supported part alignment using particle swarm optimization 13

Automated design of product-flexible car body fixtures with ...

引用

13th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2019

作者： Fritzsche, Rayk Voigt, Eric Schaffrath, Robert Todtermuschke, Marcel Röber, Marcel Group Assembly systems Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Dep. Assembly Systems Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

The fraunhofer IWU has been developed specialized clamping robots for production of different car-models on one fixture. As a base for the fixture design, a method for optimal part alignment has been developed. For handling multitude of possibilities regarding the alignment of parts from different car-models, a specific software tool using particle swarm optimization has been created. The objective was to achieve similar travels for all clamping robots in this fixture. To facilitate the integration of the automated part alignment into fixture design, a further software. © 2020 The Authors.

关键词： Particle swarm optimization (PSO)

来源：评论

学校读者我要写书评

暂无评论

Process behaviour of segmented and actuated tool electrodes for variable shaping in sinking EDM 22

Process behaviour of segmented and actuated tool electrodes ...

引用

22nd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2022

作者： Uhlmann, Eckart Thißen, Kai Westhoff, Bela Schulte Streckenbach, Jan Ludwig, Jonas Maas, Jürgen Technische Universität Berlin Institute for Machine Tools and Factuatory Management IWF Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany Technische Universität Berlin Mechatronic Systems Lab EMK Germany

ISBN: (纸本)9781998999118

In sinking electrical discharge machining (S-EDM), many applications such as the manufacturing of injection moulds require numerous tool electrodes due to tool wear compensation. The manufacturing of tool electrodes causes a high cost and time expenditure in the entire process chain. This paper aims for a novel approach to a segmentation of the tool electrode in order to shape it variably. The shaping is realized by actuation of single tool electrode segments (STES) using miniaturized linear actuators. In the future, the roughing process in S-EDM could be carried out by segmenting and variably shaping of the tool electrode. To investigate the process behaviour of a segmented tool electrode in S-EDM, different geometry configurations of the tool electrodes are compared. Experimental results show a similar material removal rate for the different tool electrode configurations. The relative linear wear of a segmented tool electrode is only 7.7 % of the relative linear wear of a monolithic tool electrode. In order to dynamically position the STES, a miniaturized electrical linear drive is developed and constructed. The outer diameter of the actuator must not exceed the edge length of an STES. In the machine tool an actuated STES is tested and the material removal rate and the relative linear wear for different Z-axis lifting motions are analysed. The material removal rate could be increased by 37 % applying actuated Z-axis lifting motions compared to the process without Z-axis lifting motion. In this context the relative linear wear increased slightly. The results of this paper are used for the further development of the system to enable more efficient process chains in the EDM process. © European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 22nd International Conference and Exhibition, EUSPEN 2022. All rights reserved.

关键词： Linear actuators

来源：评论

学校读者我要写书评

暂无评论

Concept for Maturity Assessment of Remanufacturing Ability in Production Process Development

引用

Procedia CIRP 2023年 120卷 846-851页

作者： Günther Schuh Seth Schmitz Marco Schopen Annkristin Hermann Laboratory for Machine Tools and Production Engineering (WZL) at RWTH Aachen University Campus-Boulevard 30 52074 Aachen Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

Growing demand of consumer goods increases industrial production, which poses immense challenges towards resource management. Due to the finite nature of material resources used for production, their future availability is not assured and companies face higher material costs. Manufacturing companies with linear economic value-creation encounter difficulties in coping with increased material scarcity, prices and environmental regulations. A solution to these challenges is the circular economy, in which product life cycles are extended through multiple uses in various circulation strategies. One of the most resource-efficient circular strategies is remanufacturing, where components or products are reconditioned into an as-new or even improved condition and thereby reducing material resources and energy. Despite these advantages, manual time- and cost-intensive process steps in practice characterize current remanufacturing processes. This insufficient industrialization currently inhibits economic remanufacturing. One root cause for insufficient industrialization is that remanufacturing is currently not considered in product and production process development. Some approaches for including remanufacturing requirements in product development are referred as Design for Remanufacturing (DfRem). Corresponding guidance for considering remanufacturing requirements in production process development is missing. In this paper, a maturity assessment of remanufacturing capability in production process development is developed. Initially, a literature research is conducted to identify requirements for remanufacturing process steps that need to be addressed in production process development. Subsequently, the identified requirements are transferred into action areas concerning the remanufacturing process. These action areas are subdivided into action elements for a detailed description and subdivision regarding the principles of industrialization. Last maturity levels are derived fo

关键词： Remanufacturing Product Development, Production Process Development

来源：评论

学校读者我要写书评

暂无评论

Development and Validation of a Screw Interlock Recognition Method based on Logistic Regression

引用

Procedia CIRP 2024年 127卷 110-115页

作者： Tanureza Jaya Arturo Bastidas-Cruz Jörg Krüger Fraunhofer IPK Pascalstrasse 8-9 10587 Berlin Germany Industrial Automation Technology Department Institute of Machine Tools and Factory Management Technische Universität Berlin Pascalstrasse 8-9 10587 Berlin Germany

Conventional robotic screw methods rely on position control and the use of a threshold value, normally a contact force value, to detect the contact between tool and screw, so the nut-runner can be placed correctly on the workpiece. In the case of a dynamic workspace, the variance of the workpiece position will likely cause the nut-runner to be positioned incorrectly and will significantly decrease the success rate of the screw task. This paper proposes a novel method based on a logistic regression model for flexible Human-Robot-Collaboration (HRC) screw assembly operations in highly dynamic workspaces. The proposed method is part of a screwing strategy based on impedance control and developed for HRC applications. The screwing strategy consists of a spiral movement executed by the robot while approaching the workpiece and it is used as a search procedure to find the screw. The proposed method is used to detect when the tool correctly interlocks with the screw head so the robot can proceed with the screwing process. The goal is to stop the spiral movement timely when the nut-runner has correctly interlocked with the screw head to ensure a successful screw task and avoid potential damage to the nut-runner or the workpiece. The proposed screw interlock recognition method utilizes a logistic regression model to observe the contact forces between tool and screw head. The learning model is trained using force data collected from experiments and then its feasibility is validated with further testing.

关键词： logistic regression robotic impedance control automated screwing process

来源：评论

学校读者我要写书评

暂无评论

Application of a product-centred process-independent meta-model for multi-stage production data to enable predictive quality for additive manufacturing 16

Application of a product-centred process-independent meta-mo...

引用

16th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2022

作者： Witt, Ronja Knott, Anna-Lena Cramer, Simon Schmitt, Robert H. Chair for Prod. Metrol. and Qual. Mgmt. of the Lab. for Machine Tools and Production Engineering RWTH Aachen Campus Boulevard 30 Aachen52074 Germany Fraunhofer Institute for Production Technology IPT Steinbachstr. 17 Aachen52074 Germany

In multi-step production processes with countless information sources, it is vital to accompany process data with meta-information to enable an efficient aggregation of the collected data. The relationships of process- and meta-data has been described through a previously presented flexible and process-independent meta-model, which is especially suitable for predictive quality applications. We propose an enhancement for the attribution of process parameters and quality characteristics. The two novel meta-classes provide information about tolerances and hence increase the process and product model. Our results show how the refined meta-model enhances the mapping of an additive manufacturing process. Further, we introduce an industry-ready implementation and make the code accessible on Github. © 2023 Elsevier B.V.. All rights reserved.

关键词： 3D printing

来源：评论

学校读者我要写书评

暂无评论

The Challenge of Open Cellular Metal Foam Production 11th

The Challenge of Open Cellular Metal Foam Production

引用

11th International Conference on Porous Metals and Metallic Foams, MetFoam 2019

作者： Hannemann, Christian Uhlig, Mandy Hipke, Thomas Meier, Iris Fraunhofer-Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783030427979

Five years ago fraunhofer-IWU started research in open cellular metal structures as the potential applications increased based upon their exceptional properties. Heat exchangers, filters, and battery electrodes are examples of potential applications. As casted aluminum foams were in serial production and fraunhofer in close cooperation with the manufacturer, the interest was limited to prototyping of individual foams especially in combination with solid regions for fixing, encasing, or sub-division. New parameter combinations and technological processes were developed and the advantages, limitations, and potentials are described within this document. Alternatively, galvanic coating of PUR foams with copper, nickel, and other metals is common, again buyable and state of the art. R&D activities related to application development and adapted geometries not yet realizable by conventional mass production will be shown. Investigations for graded strut-structures and cylindrical tube-like parts were intensified to reach serial production level. The lecture represents investigations, results, dropped, and new approaches of all routes. © 2020, The Minerals, Metals & Materials Society.

关键词： Metal foams

来源：评论

学校读者我要写书评

暂无评论

Position and force controlled pneumatic chuck for high precision machining 21

Position and force controlled pneumatic chuck for high preci...

引用

21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021

作者： Eckert, Udo Ben-Hanan, Uri Koriath, Hans-Joachim Mende, Mattias Weiss, Avi Wertheim, Rafi Azaria, Udi Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz09126 Germany ORT Braude College Snunit Street 51 PO Box 78 Karmiel2161002 Israel Henri Azaria PAL Ltd.

ISBN: (纸本)9780995775190

This paper presents the development of a clamping system, including force controlled jaws, a method for position and orientation control in the XY, XZ and YZ planes, based on a visual pattern identification and a numerical compensation of the workpiece position, integrated into the machine tool control unit. Reproducible correction of workpiece position and orientation were investigated, evaluated, and combined to form the new adaptive workpiece clamping system to ensure accurate positioning and clamping repeatability. The developed system is made of an air (pneumatic) chuck with 3 clamping jaws, used for holding the workpiece with a defined clamping force, controlled by air pressure. A tilting device combined with a rotating table for inclination adjustment of the XY plane, controlled by the vision identification device, is used to measure and correct the position and orientation of the workpiece. A developed algorithm for X and Y motion of the machine tool axes as a function of the visually identified values enables repositioning of the workpiece after re-clamping. The clamping forces are measured by strain gauges. The design of the associated jaws is based on FEM analysis to ensure small elastic deformations, allowing for accurate clamping forces. The visual identification of the workpiece position and movement algorithm were tested with the pneumatic chuck on a high precision CNC machine tool. The developed system provided in X and Y direction a repeatability of pattern positioning within 1.1 µm, which is three times better compared to the initial chuck reclamping repeatability. © 2021 Proceedings of the 21st International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2021. All rights reserved.

关键词： Pneumatics

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：