This research focusing on influencing the surface structure and its geometric deviations from the CAD model after various tumbling of bodies at constant parameters of the tumbling machine. The purpose of determining the actual effect on the resulting surface before and after the tumbling process, which tumbling body causes the selection of a larger grain or compaction of the surface layer. The research outputs are thermographic maps and geometric deviations measured using CAD models. The experimental line was at VŠB-TU Ostrava, with the help of the PROTOLAB 3D printing center, there was an experimental sample in your game. Measurement of access in the metrology laboratory on CMM Wenzel LH 65 X3Premium and optical heads Shapetracer II.
The article deals with the quality evaluation of engraved surfaces of selected materials after application of CO2 E4060 laser. A machined steel was chosen steel ČSN 11 373, engraving was carried out on aluminium alloy EN AW 7075, plexiglass XT, plywood and cardboard. Engraving was performed under predetermined power conditions and laser feed rates. Marking of metallic materials was made after applying the marking paste LMM 6000. The evaluation was made on the basis of a visual inspection and then a suitable combination of parameters was chosen for individual materials.
The article deals with an investigation of residual stress in machined surface under conditions of high-feed milling and determination of the influence of machining conditions on the size and types of stress resulting from cutting into the machined surface. As a testing material, the hardened tool steel W. Nr. 1.2343 (CSN 19552) was used. For the realization of the experimental activity, a high-feed milling head was used with exchangeable cutting inserts marked H600 WXCU 070515T. All surfaces were machined under different cutting conditions (200, 300, 350, 400 and 500mmin−1 cutting speed) in regard to the recommended parameters and machine tool options. The evaluated residual stress was measured in the depth of 8 μm under the surface with the device PROTO iXRD working on the principle of the X-Ray diffraction. Monitoring was carried out using an analysis of occurrence of tensile or compressive residual stress, and from these results, a possible dependence of the residual stress on the cutting conditions during milling process was determined.
The article deals with evaluating of the resulting surface state of the three plastic materials and identification of suitable conditions for laser cutting with CO 2 tube. As representative were chosen polypropylene, polymethylmethacrylate and polyamide. When cutting these types of materials it could melt eventually their re-sintering. A suitable combination of parameters is possible to achieve of sufficient quality of the cut. The samples were cut at different feed speed and laser power. Then they was compared on the basis of the measured roughness parameters Ra a Rz by using a portable touch roughness Hommel-Etamic W5 and dates was processed according to ČSN EN ISO 4287. Cutting of samples was realized at the Department of Machining, Assembly and Engineering Metrology, VŠB-TUO. AbstraktČlánek se zabývá vyhodnocením výsledného stavu povrchu tří plastických materiálů a vytipování vhodných podmínek pro řezání laserem s CO 2 trubicí. Za představitele byli vybráni poplypropylen, polymetylmetakrylát a polyamid. Při řezání těchto typů materiálů může dojít k roztavení popř. k opětovnému spojení. Vhodnou kombinací parametrů je možno docílit dostatečné kvality řezu. Uvedené vzorky byly nařezány za různých rychlostí posuvu a výkonů laseru. Vzorky byly následně porovnány na základě měřených parametrů drsnosti Ra a Rz s využitím přenosného dotykového drsnoměru Hommel-Etamic W5 a data byla zpracována dle (ČSN EN ISO 4287). Řezání vzorků probíhalo na pracovišti Katedry obrábění, montáže a strojírenské metrologie, VŠB-TU Ostrava.
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