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...
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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.
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...
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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...
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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.
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.
Micro-milling is an appropriate process for the industrial production of precision parts in the mould and die industry. Decisive for a long tool life is the wear resistance, which can be improved by cutting edge prepa...
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The machining of precision holes in difficult to machine materials or alloys with high aspect ratios φ and under consideration of the cost-effectiveness of the overall process is still a challenge. Electro-discharge ...
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For the electro-discharge drilling of micro-holes with small diameters D the production and the guidance of the tool electrode are most challenging. For holes with diameters D ≤ 50 μm the required electrodes have to...
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The dynamic behaviour of machinetools differs between standstill and process state. Operational modal analysis (OMA) makes possible to identify modal parameter under process conditions. In this paper, it is shown, ho...
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The dynamic behaviour of machinetools differs between standstill and process state. Operational modal analysis (OMA) makes possible to identify modal parameter under process conditions. In this paper, it is shown, how far the assumption of a time-invariant behaviour as well as a broadband excitation can be fulfilled by exciting the machine with a cutting process. After describing the dynamic behaviour in the work space to determine a time-invariant tool path, a broadband excitation is generated by changing cutting parameters during milling. The modal parameters are identified by different OMA methods and compared to results of the experimental modal analysis.
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