Search
Results
-
Dawn of new machining concepts: Compensated, intelligent, bioinspired
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)The impact of Industrie 4.0 onto machine tools is significant, despite the fact, that quite some of the novelties discussed within this new paradigm have their roots decades earlier. But especially the concerted action, which strives the development of sensors, controls, data processing together with connectivity, unprecedented data integration and the notion of cyber physical production systems open up new development lines towards ...Conference Paper -
EDM Drilling of Non-Conducting Materials in Deionised Water
(2018)Procedia CIRP ~ Proceedings of the 19th ISEM Conference (ISEM - XIX)Electrical discharge machining (EDM) of non-conducting materials currently is only possible with the help of an auxiliary conductive layer, known as assisting electrode, which must be regenerated after each discharge. Therefore, an assisting conductive layer is applied to the surface of the workpiece to initiate the discharge process. In order to continue erosion, the eroded surface regions must have a new conductive layer in contact with ...Conference Paper -
Limits of die-sinking EDM for micro structuring in W300 steel with pure copper electrodes
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)Electrical discharge machining (EDM) is capable of almost force-free 2D and 3D machining of any kind of conductive material. The micro die-sinking EDM process described in this paper uses electrodes with features in the micrometer scale as a working tool. The ability to machine micro features is desirable for many applications, which range from miniaturization to functionalization of large surfaces. To achieve the desired workpiecès final ...Conference Paper -
Fundamental analysis of the cutting edge micro-geometry in orthogonal machining of unidirectional Carbon Fibre Reinforced Plastics (CFRP)
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)Machining of carbon fibre reinforced plastics (CFRP) is closely related to strong abrasive tool wear and represents a significant process challenge due to its anisotropic material structure and brittle fracture behavior. Furthermore, machining of unidirectional CFRP material shows a significant increase in process forces due to tool wear effects, resulting in a changing micro-geometry of the cutting edge. This research work aims to give ...Conference Paper -
Flushing velocity observations and analysis during EDM drilling
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)Insufficient flushing is the greatest limitation factor for material removal rate (MRR) in electrical discharge machining (EDM). In order to increase the flushing efficiency during erosion and thus to increase MRR, better understanding of the dielectric distributions and flow directions is required. Additionally the discharge development and its influence to the fluid flow and flushing efficiency must be taken into account. The dielectric ...Conference Paper -
Improved stability predictions in milling through more realistic load conditions
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)In this paper, the combined influence of the load condition and the spindle speed on the tooltip dynamics of a five-axis milling machine with dominant spindle modes is evaluated. A constant preload is applied through axially and radially arranged permanent magnets while the dynamic excitation of the rotating dummy tool takes place by a force impact. The structures response is measured with non-contact sensors and Frequency Response Functions ...Conference Paper -
High aspect ratio microstructuring of copper surfaces by means of ultrashort pulse laser ablation
(2018)Procedia CIRP ~ 19th CIRP Conference on Electro Physical and Chemical MachiningLaser beam machining (LBM) is capable of almost force-free 2D and 3D machining of any kind of material without tool wear. This process is defined by many parameters, such as pulse energy, frequency, scanning velocity and number of scanning repetitions. Modern laser machines provide high energy at shorter pulse durations and have more precise positioning systems than machines of the past. These can easily fulfil today's continuous changing ...Conference Paper -
In-process workpiece based temperature measurement in cylindrical grinding
(2018)Procedia CIRP ~ 8th CIRP Conference on High Performance Cutting (HPC 2018)In conventional grinding processes a huge partition of the machining energy is received by the workpiece. Damage due to high thermal load might happen on the surface as well as in sublayers of the workpiece where favourable process parameters and optimized coolant supply are stringent to avoid them. To detect thermal damage known as grinding burn various established techniques like barkhausen noise measurement for ferromagnetic materials ...Conference Paper -
A particle strength exchange method for metal removal in laser drilling
(2018)Procedia CIRP ~ 51st CIRP Conference on Manufacturing SystemsA meshfree Particle Strength Exchange (PSE) method is developed for metal removal in a simplified laser drilling problem. To this end, the problem of transient state heat transfer is solved by exerting a static laser beam with a Gaussian intensity distribution, as the external heat source. The proposed PSE scheme is a fully Lagrangian approach, which is straightforward to implement as compared to alternative meshfree methods currently ...Conference Paper -
Design to Specifications - A Strategy for Specification-Based Machine Design
(2018)Procedia CIRPIncreasingly integrated systems and the use of innovative lightweight structures enabled an evolution of the machine tool industry to products with very high dynamic performance and precision. For the development of modern machine tools, simulation has continuously gained in importance. However, due to increasing pressure to reduce the time-to-market of new products, an efficient work-flow for the integration of simulation in the design ...Conference Paper