The increasing amount of production resources to be maintained and efficiency requirements are forcing manufacturing companies to improve production and maintenance effectiveness by a mutual consideration of both func...
详细信息
The increasing amount of production resources to be maintained and efficiency requirements are forcing manufacturing companies to improve production and maintenance effectiveness by a mutual consideration of both functions in an integrated planning process. However, less attention is paid to monitor the performance of manufacturing systems based on key performance indicators to identify the need for measures and adapting plans. Performance Measurement Systems (PMS) are applied to accomplish this task. Therefore, this paper presents an evaluation of existing PMS’s for production and maintenance planning. A new PMS that considers strategic and operational views is presented and validated by an industrial case study.
Due to market competition, the synchronized individual production principle penetrates industrial companies with single- or small-series production promising more efficient and reliable production processes. The gener...
详细信息
Due to market competition, the synchronized individual production principle penetrates industrial companies with single- or small-series production promising more efficient and reliable production processes. The general principle and scheduling algorithms have been introduced in the past, however without implementing production control. Therefore, this paper introduces the control of a synchronized individual production aiming to act proactively. First, a literature review demonstrates the scientific relevance. Second, a predictive control concept is designed and its components are introduced. Compared with conventional job-shop control, the approach considers the characteristics of the synchronized individual principle and bridges the gap that inhibits its successful industrial application.
Today’s tool and die production is characterized by a high level of individualization and complex manufacturing processes. As a result tool making companies need a high number of various machinetools which require a...
Today’s tool and die production is characterized by a high level of individualization and complex manufacturing processes. As a result tool making companies need a high number of various machinetools which require a high investment and big footprint. A flexible robotic system offers the advantage of combining several manufacturing processes in one set up (e.g. by interchangeable tool heads). But the diverse and contrary requirements of manufacturing processes are a challenge for the selection of a specific robot system. The developed decision logic solves this problem by using weighted fuzzy attribute sets to evaluate the feasibility and economic efficiency.
The EU Horizon 2020 project »JointPromise« proposes the development and implementation of an end-to-end automated production platform for three-dimensional joint implants, paving the way for tissue-engineere...
详细信息
The EU Horizon 2020 project »JointPromise« proposes the development and implementation of an end-to-end automated production platform for three-dimensional joint implants, paving the way for tissue-engineered implants able to regenerate deep osteochondral defects. Currently, the manufacturing pipeline consists in manual production processes for microtissue cultivation, harvest and bioassembly into larger implants. In the conceptualizing stage of this project, the manual processes were translated into standard operating protocols (SOPs) and process design criteria like material flow and throughput as well as technical specifications of laboratory devices for an automated performance were elaborated. Spheroid-based implants provide a novel approach in tissue engineering by aggregating progenitor cells into potent microtissues. After the differentiation of cartilaginous microtissues, functional joint implants are assembled via 3D bioprinting to match the complex structural organization of native cartilage tissue. The »JointPromise« platform includes suitable devices for cell and microtissue cultivation, harvest and implant production as well as quality control in an overall layout consisting of according pipetting units, incubator, centrifuge, bioprinter and high-speed microscope. After initiating the platform build-up, a control software for process controlling and monitoring during cell seeding, cultivation and harvest is implemented. Clinical feasibility and efficacy of osteochondral defect regeneration by the produced joint implants will subsequently be proven in large animal models. This project received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement no 874837.
Hard machining of brittle materials like ceramics is a process-oriented challenge. It has been shown that abrasive water jet cutting is an appropriate alternative to commonly used diamond grinding or laser cutting pro...
详细信息
Hard machining of brittle materials like ceramics is a process-oriented challenge. It has been shown that abrasive water jet cutting is an appropriate alternative to commonly used diamond grinding or laser cutting processes. In Abrasive water jet machining the injection technology is currently used almost exclusively. Due to the realization of the suspension jet technology a higher cutting performance can be achieved. In this article the known injection principle and the suspension principle will be compared. Therefore, influences on the quality were examined for trimming technical ceramics. The investigation illustrates that suspension technology trims with a higher accuracy than injection technology in matters of kerf geometry and roughness parameters.
In industry micro-milling tools made of cemented carbide are widely used. However, these micro-milling tools suffer from fast and random tool breakage during the machining of hard to machine materials. Therefore, in p...
详细信息
The amount of information contained in process signals such as acoustic emission and force signals has proven vital for the detection of changes in physical conditions or quality feature prediction in sheet metal form...
The amount of information contained in process signals such as acoustic emission and force signals has proven vital for the detection of changes in physical conditions or quality feature prediction in sheet metal forming applications. Both signal types have also been researched in the context of wear detection, yet systems that reliably identify the wear state at a given time in sheet metal forming processes based on these signals do not exist. This paper proposes an architecture to assess the wear increase within a given time frame in an experiment based on an autoencoder. The ability of autoencoders to encode and decode signals has been widely studied and this approach leverages the fact that autoencoders are more likely to learn representative encodings on stable and homogeneous signals than on heterogeneous signals with high fluctuations. This approach utilizes the circumstance that high tool wear leads to changes in the signal and signal fluctuation. In consequence, autoencoders can be utilized to track tool wear progression without the need for labelled data. The findings show a strong similarity to physical models for the wear progression of tool components, indicating the validity of this approach. Additionally, an analysis of the signals yields characteristic effects of the considered force signals that could specifically represent wear resistance.
Contemporarily, the tool and die industry is facing major challenges. The global market competition and increasing cost pressure affects even solid companies. Consequently, automation approaches, like interlinked manu...
详细信息
Contemporarily, the tool and die industry is facing major challenges. The global market competition and increasing cost pressure affects even solid companies. Consequently, automation approaches, like interlinked manufacturing systems, require new consideration within tooling. These complex systems imply individual constraints with specific design criteria, depending on the company’s individual product range. Using the resource evaluation of interlinked manufacturing systems, strengths and weaknesses can be deducted. Hereby it is crucial to consider the machine’s periphery, like clamping systems, magazines or cleaning devices. This paper provides a structured evaluation approach and technological performance index calculation for the periphery of interlinked manufacturing systems.
暂无评论