The paper gives some insight into modelling of selected applications in heat supported forming processes of sheet metal and closed profiles. Simulation strategies and computational results are discussed and, by means ...
详细信息
One approach in the area of material development Is the designing of materials properties by grain refinement. Methods of severe plastic deformation (SPD) can create ultrafine-grained or nanostructured metallic materi...
详细信息
This paper proposes an approach for supporting the analysis of collected energy consumption data in combination with structured system models to reveal correlations between energy usage and related properties of produ...
详细信息
ISBN:
(纸本)9783642196911
This paper proposes an approach for supporting the analysis of collected energy consumption data in combination with structured system models to reveal correlations between energy usage and related properties of products, operations and equipment. The described method serves as a starting point for the creation of tailored simulation models for energy consumption forecasts that can be used in the planning phase of manufacturing systems. Therefore several energy-oriented simulation methods are introduced and discussed regarding their suitability for different use cases in manufacturing engineering.
This paper addresses Virtual Reality-assisted pre-testing of NC programs and describes the benefits of testing them with respect to processing on the NC control unit. Thereby collisions of machine axes can be recogniz...
详细信息
Surfaces in a wide range of engineering applications are subject to tribological loads. Many of these surfaces have a profound effect on the efficiency of manufacturing processes and products during service. This pape...
详细信息
ISBN:
(纸本)9780955308291
Surfaces in a wide range of engineering applications are subject to tribological loads. Many of these surfaces have a profound effect on the efficiency of manufacturing processes and products during service. This paper focuses on the effect of surface microstructure geometry on the friction coefficient between lubricated sliding partners. Initially, the Computational Fluid Dynamics (CFD) package COMSOL Multiphysics was used to determine the effect of geometry parameters of semi-spherical cavities on hydrodynamic pressure. The simulations showed that surface microstructures act as micro pressure chambers that would allow the sliding partners to reach hydrodynamic lubrication at lower operating speeds. Patterns of the microstructure that showed the highest pressure build-up in the simulations were then manufactured by Jet-ECM and tested in a tribometer. It was determined that patterned spherical segment cavities 10 μm deep and 500 μm wide yield a friction coefficient reduction of up to 35 %.
The measurement of boreholes with diameters smaller than 500 μm is a demanding task that cannot be performed using state-of-the-art production metrology. In this letter, a miniaturized fiber probe with a diameter of...
详细信息
The measurement of boreholes with diameters smaller than 500 μm is a demanding task that cannot be performed using state-of-the-art production metrology. In this letter, a miniaturized fiber probe with a diameter of 80μm is presented. A probe is used for low-coherence interferometry to conduct highly precise measurements of form deviations of small boreholes. Measurements conducted in nozzles are also presented. The results prove the potential of the fiber-optical sensor for quality inspection of high-precision parts, such as injection nozzles, for common-rail diesel engines.
Tool making is a very time consuming and expensive operation because many iteration loops are used to manually adjust tool components during the try-out process. That means that trying out deep drawing tools is 30% of...
详细信息
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...
详细信息
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...
详细信息
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.
暂无评论