39 research outputs found

    The scope of application of incremental rapid prototyping methods in foundry engineering

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    Abstract The article presents the scope of application of selected incremental Rapid Prototyping methods in the process of manufacturing casting models, casting moulds and casts. The Rapid Prototyping methods (SL, SLA, FDM, 3DP, JS) are predominantly used for the production of models and model sets for casting moulds. The Rapid Tooling methods, such as: ZCast-3DP, ProMetalRCT and VoxelJet, enable the fabrication of casting moulds in the incremental process. The application of the RP methods in cast production makes it possible to speed up the prototype preparation process. This is particularly vital to elements of complex shapes. The time required for the manufacture of the model, the mould and the cast proper may vary from a few to several dozen hours

    On roughness measurement by angular speckle correlation

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    In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated

    Problems of Surface Stereometry Characterization

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    W artykule przedstawiono wielopunktowe metody pomiaru b艂臋d贸w kszta艂tu. Powierzchni rzeczywistej w budowie maszyn nie wystarczy charakteryzowa膰 jedynie w dw贸ch wymiarach, na podstawie analizy profilu. Dlatego stworzono analiz臋 tr贸jwymiarow膮, opieraj膮c膮, si臋 na odwzorowaniu mierzonej powierzchni za pomoc膮 siatki punkt贸w. W artykule przedstawiono podstawowe za艂o偶enia analizy topografii powierzchni. Om贸wiono spos贸b doboru powierzchni odniesienia dla powierzchni nominalnie p艂askich oraz zakrzywionych, a tak偶e scharakteryzowano parametry i funkcje stosowane w ocenie stereometrycznej. Pokazano r贸偶nice wyst臋puj膮ce pomi臋dzy parametrami w uj臋ciu 2D i ich odpowiednikami w uj臋ciu 3D. Istotno艣膰 tych r贸偶nic nie pozwala na w艂a艣ciw膮, ocen臋 powierzchni analizowanej na podstawie profilu. Przedstawiono r贸wnie偶 przyk艂ad analizy anizotropii powierzchni.Actual engineering surface cannot be characterized only in two dimensions, basing upon a single profile. For this reason three dimensional analysis was created where surface is represented by a gird of points with coordinated serving as input data for parametric analysis. In the paper general assumptions concerning topography analysis were presented. translation tables for nominally flat and curved surfaces as well as 3D parameters were described. Differences in 2D and 3D meaning were shown. Their significance in some cases makes proper roughness assessment from profile practically impossible. Anisotropy analysis was also presented

    Theoretical basis of spatial analysis of surface asperities

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    Ka偶dy przedmiot materialny wyst臋puj膮cy w otoczeniu cz艂owieka jest ograniczony powierzchniami. Ka偶da taka powierzchnia z kolei cechuje si臋 pewnymi nier贸wno艣ciami, kt贸re na niej wyst臋puj膮 i s膮 nieod艂膮czn膮 cech膮 wszystkiego, czego mo偶emy dotkn膮膰, co mo偶emy pozna膰 czy zaobserwowa膰. Ich charakteryzacja jest bardzo istotnym zagadnieniem, poniewa偶 pozwala ocenia膰 okre艣lone powierzchnie pod k膮tem ich jako艣ci i funkcjonalno艣ci. W artykule przedstawiono podstawy przestrzennej analizy nier贸wno艣ci powierzchni. Zaprezentowano podstawowe rodzaje nier贸wno艣ci, om贸wiono spos贸b doboru odcinka pr贸bkowania i dob贸r elementu nominalnego. Pokazano zasadnicze metody filtracji uwzgl臋dniaj膮c najnowsze osi膮gni臋cia w tym zakresie, jak np. przycinanie Wolfa. Przedstawiono parametry obliczane z danych topograficznych z ich podzia艂em na parametry zwi膮zane z obszarem i cechami oraz zale偶no艣ciami s艂u偶膮cymi do wyznaczania warto艣ci.Every material item is separated from surroundings by boundaries that are surfaces. Each such a surface is featured with certain asperities, that appear on it and are present on everything that we can touch, inspect and observe. Characterizing them is a very important issue, because it allows to assess surfaces regarding their quality and functionality. In the paper basis of three dimensional analysis of surface asperities are described. Types of asperities are presented and method of choosing a sampling length and nominal element are shown. Ways of surface filtering including the most up to day ones e.g. Wolf pruning are discussed. Three dimensional parameters calculated from topographical data are described with their division into area related ones and connected with features as well as formulas used to calculate them

    INVESTIGATIONS ON WEAR OF THE MILING CUTTERS EDGES FOR SPLINEWAY

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    In the paper, the results of investigations on the milling cutters edges for splineway with and without hard surface layers. The wear examinations were divided into two groups: a) milling of the closed splineway and b) milling of the splineway opened on one side. The investigations were performed with material hardened up to 40-44 HRC. In both cases, the characteristics of the wear on the edges and the front of the milling cutter. In the paper, the graphs of the wear of milling cutters blades made out of sintered carbids covered with TiN and TiAlCN, as well as without coating are presented
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