The fabrication of high aspect ratio microstructures is very challenging, especially when the work piece material is hard to machine. Electro Discharge Machining (EDM) offers a contact- and nearly force free way of mi...
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ISBN:
(纸本)9780955308291
The fabrication of high aspect ratio microstructures is very challenging, especially when the work piece material is hard to machine. Electro Discharge Machining (EDM) offers a contact- and nearly force free way of micromachining and is therefore an appropriate means to producing microstructures. One key obstacle for a precise machining by micro-EDM is the tool wear. When ED-machining microstructures process speed, stability and thus tool wear are related to the aspect ratio of the structures. In this study, tool wear ratio within different stages of the EDM process is analysed when machining high aspect ratio micro bores in steel. Experiments with bores of different depths show the correlation between the stage of the process and the flushing conditions on the one hand and the tool wear ratio on the other hand. Thus, it is possible to find and apply optimized parameters for the different process stages. A better understanding of the tool wear will help to minimize it, reducing the cost of the tools and enhancing the precision of the process. This also shall allow an enhancement of the process speed because the need for flushing material out of the bore is reduced by the amount of tool material that can be saved.
The consideration of energy-related parameters is already in the planning phase an important step towards an energy-autonomous factory. Using Virtual Reality (VR) gives planners an important basis for decision-making ...
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The consideration of energy-related parameters is already in the planning phase an important step towards an energy-autonomous factory. Using Virtual Reality (VR) gives planners an important basis for decision-making with regards to drafting the layout. This potential should also be used for incorporating energy-related parameters. This paper introduces the coupling of a 2D planning system with a VR environment as the basis for the development of an energy-sensitive planning system. A prerequisite for considering energy-related parameters is recording and visualizing them. Therefore, the second part of the paper deals with energy visualization within a machine at the micro level.
This paper deals with the combination of micro milling and laser micro structuring for processing hot embossing dies for microfluidic applications. This strategy permits the advantages of each process technology to be...
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This paper deals with the combination of micro milling and laser micro structuring for processing hot embossing dies for microfluidic applications. This strategy permits the advantages of each process technology to be exploited in order to achieve a cost and time efficient process and also to process forms and structures which cannot be manufactured with the single processes micro milling and laser micro structuring. Basic requirements are a high-precision positioning of the single process areas and also a good machining of the parts and structures with the manufacturing processes micro milling and laser micro structuring. The intersections between the different processing areas present a challenge for this process technology.
This paper deals with the investigation of orthogonal turn-milling of aluminium matrix composites using CVD (chemical vapour deposition) diamond tipped end mills. The influence of eccentricity, tool position and milli...
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ISBN:
(纸本)9780955308291
This paper deals with the investigation of orthogonal turn-milling of aluminium matrix composites using CVD (chemical vapour deposition) diamond tipped end mills. The influence of eccentricity, tool position and milling strategy on the surface integrity is described. The results show that the lowest roughness values can be achieved by positioning the tool below the work piece axis, using an eccentricity e = 2.5 mm and choosing up milling.
In this paper the influence of different forming velocities (stamp velocities) on the micro impact extrusion is investigated. The research is done on precision micro cavities which were formed into aluminium sheet mat...
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ISBN:
(纸本)9780955308291
In this paper the influence of different forming velocities (stamp velocities) on the micro impact extrusion is investigated. The research is done on precision micro cavities which were formed into aluminium sheet material using micro impact extrusion. The dependency of the stamp velocity is characterized using geometric parameters, metallographic analysis, and surface roughness. It was found that the grade of influence of forming velocity on characteristic parameters of the formed micro geometry depends on the sheet material thickness. For low thickness no influence was found, but for large thickness the velocity influences the achieved forming result.
The basic principle of Electrochemical Machining is an anodic dissolution of metallic work pieces at their interface to a liquid ion conductor, called electrolyte, under the influence of electric charge transport. Ele...
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ISBN:
(纸本)9780955308291
The basic principle of Electrochemical Machining is an anodic dissolution of metallic work pieces at their interface to a liquid ion conductor, called electrolyte, under the influence of electric charge transport. Electrochemical Machining with closed electrolytic free jet (Jet-ECM) is a new procedure which applies high current densities with a high degree of local removal, high localization of erosion and high surface quality [1]. Starting from this point machining of rotating work pieces by help of Jet-ECM is investigated [2]. Therefore a Jet-EC Turning prototype system was developed at Chemnitz University of technology. In this study experimental investigations for a characterization of the influence of different process parameters on the Jet-EC turning result are presented.
Due to their high specific workloads and small spatial requirements, shape memory alloys(SMA) possess an outstanding potential to serve as miniaturized positioning devices in small machinesThey provide sensory and act...
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Due to their high specific workloads and small spatial requirements, shape memory alloys(SMA) possess an outstanding potential to serve as miniaturized positioning devices in small machinesThey provide sensory and actory capabilities, being self-sufficient and a structure inherent control loopBased on its unique properties we present examples of SMA-actuated applications and methods of modeling systems, in which the material is used to compensate thermal induced strain in machine tool relevant applications and show how the overall system design can be achieved.
Miniaturization leads to high requirements to the applied manufacturing processes especially in respect to the used hard to machine materials and the aims of structure size and geometrical accuracy. Traditional manufa...
Miniaturization leads to high requirements to the applied manufacturing processes especially in respect to the used hard to machine materials and the aims of structure size and geometrical accuracy. Traditional manufacturing processes reach their limits here. One alternative for these provide thermal and chemical ablation processes. These processes are applied for the production of different microstructures in different materials like hardened steel, carbides and ceramics especially for medical engineering and tribological applications.
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