Machining of Hypereutectic Aluminum Silicon Alloys

Uhlmann, Eckart; Flögel, Karsten; Sammler, Fiona; Rieck, Iris; Dethlefs, Arne

doi:10.1016/j.procir.2014.03.069

Cited by 10 publications

(2 citation statements)

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“…One of the most critical machining factors is surface integrity [47]. The surface roughness is mainly dependent on alloy hardness and microstructural characteristics [48]. The higher the hardness, the lower the surface roughness, because the material adhesion to the cutting edge is reduced [11].…”

Section: Introductionmentioning

confidence: 99%

Study on Technological Effects of a Precise Grooving of AlSi13MgCuNi Alloy with a Novel WCCo/PCD (DDCC) Inserts

et al. 2020

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The WCCo/PCD (Diamond Dispersed Cemented Carbide—DDCC) manufactured with the use of PPS (pulse plasma sintering) are modern materials intended for cutting tools with the benefits of tungsten carbides and polycrystalline diamonds. Nevertheless, the cutting performance of DDCC materials are currently not recognized. Thus this study proposes the evaluation of technological effects of a precise groove turning process of hard-to-cut AlSi13MgCuNi alloy with DDCC tools. The conducted studies involved the measurements of machined surface topographies after grooving with different cutting parameters. In addition, the tool life and wear tests of DDCC inserts were conducted during grooving process and the obtained results were compiled with values reached during machining with cemented carbide tools. It was also proved that grooving of AlSi13MgCuNi alloy with DDCC inserts enables 5 times longer tool life and almost 3-fold increase of cutting path compared to values obtained during grooving with H3 and H10 cemented carbide inserts. Ultimately, the feed value of f = 0.15 mm/rev and cutting speed in a range of 800 m/min ≤ vc ≤ 1000 m/min during grooving with DDCC inserts can be defined as an optimal machining parameters, enabling the maximization of tool life and improvement in surface quality.

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Section: Introductionmentioning

confidence: 99%

Study on Technological Effects of a Precise Grooving of AlSi13MgCuNi Alloy with a Novel WCCo/PCD (DDCC) Inserts

et al. 2020

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“…In the field of jet cutting, the research focus lies in how jet features and cutting performance are influenced by the parameters and position of nozzle [14][15][16]. For instance, Eckart Uhlmann et al [17] discovered that jet velocity peaked at the cone angle of 400. Ozcelik et al [18] studied the impacts of cone angle on surface roughness of the stone after jetting, pointing out that the surface roughness is large at a small or large cone angle and small at a medium cone angle.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Flow Field in Waterjet Nozzles with Different Structures

Hua¹,

Zhang²,

Li³

et al. 2019

I2M

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This paper attempts to measure the jet flow field of different nozzles accurately, and optimize the effect of the jetting devices. For this purpose, four nozzles with different structures were physically and mathematically modelled, including conical-cylindrical nozzle, conical nozzle, cylindrical nozzle and streamlined nozzle. The turbulence was described by the improved standard k-epsilon (k-ε) turbulence model. Then, the measurement space was meshed into unstructured triangular grids, with high grid density in key areas. Next, the flow field inside and outside each nozzle was simulated on ANSYS Fluent, and the jet velocity field distribution at different positions, velocity fields and kinetic turbulence were analyzed based on the simulation results. The analysis shows that the streamlined nozzle achieved the highest flow velocity and lowest turbulent energy at the centerline of the flow field, and should be prioritized in actual applications. The conical-cylindrical nozzle strikes a good balance between efficiency and cost, providing a good option for jetting operations. By contrast, conical nozzle and cylindrical nozzle should not be adopted. The cylindrical segment can stabilize the shape of the jet by increasing the jet acceleration and peak velocity. The nozzle structure should be optimized to reduce the energy loss in each phase of energy conversion, thereby lowering the energy required to destroy a unit volume of the target. The simulation results shed important new light on the selection of nozzle for jetting devices.

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