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Development of Process Chain for Micro-Injection Molding
(2020)Procedia CIRP ~ 20th CIRP Conference on Electro Physical and Chemical MachiningIn today’s continuously growing demand for components with increasingly smaller dimensions and features, micro-manufacturing is gaining more significance. For the mass production of plastic components with micro-features, injection molding is particularly suitable and still customary in order to keep target costs. Due to high requirements regarding lifetime and resistance to wear, the molds are made of hardened steel. The shaping of these ...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 -
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 -
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 -
Performance and Limitations of the Conventional Electrode Materials for Erosion of High Aspect Ratio Microcavities
(2016)Procedia CIRP ~ 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII)The low electrode wear strategy based on a carbonaceous layer formation on electrodes considerably increases resource efficiency in the conventional die-sinking EDM. However, the smallest electrode projection area Ap for using the strategy is limited to 0.1 mm2 and maximum pulse current 3A, possibly due to the pulse re-opening phenomenon. In this work, using a novel generator circuit, pulse re-openings have been restricted up to pulse ...Conference Paper