Abrasive flow machining (AFM) is a unique machining method used to achieve high surface quality on inner, difficult-to-access contours and on outside edges. Using AFM, it is possible to deburr complex shaped intersecting holes and to realize pre-defined edge rounding on any brittle or hard material. Moreover it is easy to integrate into an automated manufacturing environment. Reproducibility of results saves various time and cost consuming manual operations in industrial applications. However for an implementation in new applications costly and time-consuming preliminary investigations are required that have to be carried out by trained staff. Therefore the aim of recent research activities is to identify the fundamentals of the process, the functional correlations between setting parameters and work results. This paper presents an approach using a numerical simulation to develop a process model. Furthermore a model is introduced that describes the fundamental principles of the deburring process using AFM.
Water jet cutting is used for cutting various materials for decades. However, due to the disadvantages of this method not all materials can be processed. Many disadvantages can be avoided if CO2 is used instead of water. Carbon dioxide evaporates after processing and allows a dry, residue-free cutting process. A method for jet cutting with liquid carbon dioxide is presented and the first results of cutting tests on various materials are shown
CO2-Schneestrahlen als Reinigungsverfahren ist für den automatisierten Einsatz prädestiniert. Vorteilhaft ist die strahlmittelrückstandsfreie Bearbeitung, nachteilig hingegen die geringe Strahlleistung. Um die Strahlleistung beim CO2-Schneestrahlen erhöhen zu können, müssen die strömungs- und prozesstechnischen Einflüsse auf die CO2-Schneeentstehung bekannt sein. Hierfür wurden Behälterdruck, Geometrie und Lage der Agglomerationskammer und darin integrierte Prallflächen untersucht.
CO2 snow blasting as a cleaning method is well suited for automated applications. Advantageously, the machining is free of residues of the blasting agent, the low blasting performance being its main disadvantage. To increase the performance of the CO2 snow blasting process, the influence of flow and process parameters on CO2 snow generation has to be known. For this purpose, container pressure, the geometry and the position of the agglomeration chambers as well as integrated baffles were analyzed.
In this paper the technological fundamentals of dry ice blasting as a pre-treatment process for the electroplating of plastics are presented. The advantages compared to conventional pre-treatment are discussed. In a series of experiments the influence of the setting parameters of the surface area roughness and surface tension of the workpiece was investigated. Furthermore, the surface parameters, which influence the adhesion strength of the electro-coating process, were identified. Finally, a model in order was developed, to describe the correlation between the dry ice blasting setting parameters and the surface parameters was created.
Chemical cleaning methods are under strict restrictions due to the legislator, as they are often harmful to environment and health. Therefore, environmentally neutral cleaning methods will gain importance in the future. Alternative cleaning processes like blasting with solid carbon dioxide can substitute such harmful chemicals without residues of blasting media. CO2 snow blasting has a minor technical complexity with a possible high degree of automation, but is limited in its cleaning performance. Basic knowledge of CO2 formation must be gained in order to increase the cleaning performance. The basic dependencies of ambient pressure and temperature as well as the possibility of their manipulation regarding the produced CO2 particles were investigated. The investigations were conducted using design of experiments and lead to a model describing the CO2 snow formation and its properties. The goal was to manipulate the properties of the generated CO2 snow in order to optimise the technology regarding the cleaning task.
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