A Method for the Determination of Theoretical Roughness in Face Milling Considering the Run-Out of the Inserts

2017 ◽  
Vol 261 ◽  
pp. 251-258 ◽  
Author(s):  
Csaba Felho ◽  
János Kundrák
Keyword(s):  
Experimental Data ◽  
Surface Topography ◽  
Calculation Method ◽  
Face Milling ◽  
Tool Geometry ◽  
Roughness Parameters ◽  
Edge Geometry ◽  
Cad Modelling ◽  
Cut Surface

A method is introduced for determining theoretical values of roughness characteristics of surfaces generated by tools having a defined edge geometry. The method is based on the CAD modelling of the theoretical cut surface, and can be used to model practically any complex tool geometry. In application to rotating tools (e.g. face milling), besides the variety of tool designs, the setting accuracy was also taken into consideration during the determination of theoretical values due to the simultaneous cutting of more than one edge. It will be demonstrated that in addition to the determination of 2D roughness parameters, the method is suitable to determine the 3D roughness parameters as the surface topography can be more accurately described with these characteristics. Experimental data is shown to validate of the extended modelling and calculation method.

scholarly journals Application of 3D Roughness Parameters for Wear Intensity Calculations

2021 ◽  
Vol 58 (5) ◽  
pp. 27-37
Author(s):  
N. Bulaha ◽  
O. Linins ◽  
A. Avisane
Keyword(s):  
Experimental Data ◽  
Wear Intensity ◽  
Linear Wear ◽  
Roughness Parameters ◽  
Distribution Law ◽  
Relative Level ◽  
Intensity Calculations ◽  
Material Volume ◽  
The Given

Abstract In this paper, calculations of 3D parameter Vm (material volume) of surfaces with irregular roughness and comparison with experimental data were performed, with further application of this parameter in calculations of wear intensity. First, using Mountains Map software for profilometric measurements, 3D roughness processing and determination of material volume Vm at specific relative levels γ were performed. The next step was an additional analysis of the distribution of surface ordinates using a theoretical and experimental Laplace function. The given check confirmed that for mostly surfaces with irregular roughness the ordinate distribution corresponds to the normal Gaussian distribution law, but in cases when the asymmetry of the ordinate distribution function goes outside the permissible limits (|∆Ssk|> 10%), errors> 10 % occur. On this basis, the mathematical formula of the material volume Vm was derived, and the obtained calculations were compared with the measured values. The results showed that the calculated values of the parameter Vm were very close to the experimental data (|∆Vm|<10 %), while at the relative level γ=+3, errors occurred that was related to the deviation from the normal distribution law. It was concluded that the given parameter could be used in the calculations of linear wear intensity, knowing the relative level γ.

Surface Roughness Prediction in Face Milling by Special Tools

2016 ◽  
Vol 686 ◽  
pp. 161-167 ◽  
Author(s):  
Csaba Felhő ◽  
János Kundrák
Keyword(s):  
Surface Roughness ◽  
Calculation Method ◽  
Theoretical Calculations ◽  
Face Milling ◽  
Experimental Investigations ◽  
Roughness Parameters ◽  
First Case ◽  
The Face ◽  
Roughness Prediction ◽  
Cutting Inserts

The ability to plan the surface roughness in case of machining by rotational tools is introduced in the paper by the help of a formerly developed calculation method. This method utilizes the theoretical surface roughness indexes which were calculated in advance for the prediction of the expected surface roughness parameters. An experimental milling head is considered for the theoretical and experimental investigations, which can contain different insert geometries. The paper describes two distinct cases: in the first case, the face milling is performed by two identical cutting inserts, while in the second one, two different insert are applied simultaneously. Results of the carried-out experiments are also presented for the validation of the theoretical calculations.

Determination of Surface Roughness Parameters by Optical Profilometry and Sand Patch Test

2017 ◽  
Vol 259 ◽  
pp. 15-20 ◽  
Author(s):  
Đorđe Čairović ◽  
Martin Zlámal ◽  
Petr Štěpánek ◽  
Tomáš Trčka ◽  
Pavel Škarvada ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Treatment ◽  
Surface Topography ◽  
Patch Test ◽  
Shear Resistance ◽  
Optical Profilometry ◽  
Roughness Parameters ◽  
Sand Patch ◽  
Non Destructive

In cases when two concrete parts are cast against in different times are not connected by dowels, main contributors to the resistance are cohesion and friction. Shear resistance of the interface is highly dependent on surface treatment and its roughness. In this paper, besides the review of available methods of surface roughness determination, the optical profilometry will be introduced and described. Optical profilometry represents non-contact and non-destructive method for characterizing surface topography. Furthermore, results obtained by abovementioned method will be compared with Sand Patch Test, in order to determine its usability and limitations.

Investigation of the Topography of Face Milled Surfaces

2018 ◽  
Vol 919 ◽  
pp. 78-83 ◽  
Author(s):  
János Kundrák ◽  
Csaba Felhő
Keyword(s):  
Surface Topography ◽  
Cross Section ◽  
Three Dimensional ◽  
Face Milling ◽  
Depth Of Cut ◽  
Roughness Parameters ◽  
Machined Surfaces

Effects of the changing of cutting on the two-and three-dimensional roughness parameters of surfaces machined by face milling are investigated in the paper. The focus is on how the changing of the ratio of the feed and depth of cut affects the generated surface topography and its parameters in the case of constant undeformed uncut chip cross-section. Additionally, it is demonstrated how setting errors of individual inserts affect the roughness parameters of machined surfaces.

EXPERIMENTAL STUDIES OF REINFORCED CONCRETE STRUCTURES WITH CROSS-SHAPED SPATIAL CRACK UNDER TORSION WITH BENDING

2020 ◽  
Vol 92 (6) ◽  
pp. 13-25
Author(s):  
Vl.I. KOLCHUNOV ◽  
◽  
A.I. DEMYANOV ◽  
M.M. MIHAILOV ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Experimental Determination ◽  
Calculation Method ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Design Parameters ◽  
Reinforced Concrete Structures ◽  
Experimental Scheme

The article offers a method and program for experimental studies of reinforced concrete structures with cross-shaped spatial crack under torsion with bending, the main purpose of which is to check the design assumptions and experimental determination of the design parameters of the proposed calculation method. The conducted experimental studies provide an opportunity to test the proposed calculation apparatus and clarify the regularities for determining deflections, angles of rotation of extreme sections, and stresses in the compressed zone of concrete. For analysis, the article presents a typical experimental scheme for the formation and development of cracks in the form of a sweep, as well as characteristic graphs of the dependence of the angles of rotation of end sections.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Numerical evaluation of hydrodynamic characteristics of planing hulls by using a hybrid method

2021 ◽  
pp. 147509022199024
Author(s):  
Emre Kahramanoglu ◽  
Silvia Pennino ◽  
Huseyin Yilmaz
Keyword(s):  
Experimental Data ◽  
Hybrid Method ◽  
Design Stage ◽  
Hydrodynamic Characteristics ◽  
Calm Water ◽  
Preliminary Design Stage ◽  
Reduction Function ◽  
Hull Forms ◽  
Good Agreement

The hydrodynamic characteristics of the planing hulls in particular at the planing regime are completely different from the conventional hull forms and the determination of these characteristics is more complicated. In the present study, calm water hydrodynamic characteristics of planing hulls are investigated using a hybrid method. The hybrid method combines the dynamic trim and sinkage from the Zarnick approach with the Savitsky method in order to calculate the total resistance of the planing hull. Since the obtained dynamic trim and sinkage values by using the original Zarnick approach are not in good agreement with experimental data, an improvement is applied to the hybrid method using a reduction function proposed by Garme. The numerical results obtained by the hybrid and improved hybrid method are compared with each other and available experimental data. The results indicate that the improved hybrid method gives better results compared to the hybrid method, especially for the dynamic trim and resistance. Although the results have some discrepancies with experimental data in terms of resistance, trim and sinkage, the improved hybrid method becomes appealing particularly for the preliminary design stage of the planing hulls.

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