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Wyszukujesz frazę ""surface roughness parameter"" wg kryterium: Temat


Tytuł :
Surface roughness characterization of cast components using 3D optical methods.
Index Terms :
A novel method that applies a non-contact technique using a 3D optical system to measure the roughness of selected standard surface roughness comparators used in the foundry industry is presented. This method is described in detail in the paper. Profile and area analyses were performed using scanning probe image processor (SPIP) software and the results of the surface roughness parameters obtained were subjected to statistical analyses. The bearing area ratio was introduced and applied to the surface roughness analysis. From the results, the surface quality of the standard comparators is successfully characterised and it was established that the areal parameters are more informative for sand cast components. The roughness values of the standard visual comparators can serve as a control for the cast components and for order specifications in the foundry industry. A series of iron castings were made in green sand moulds and the surface roughness parameter (Sa) values were compared with those of the standards. Sa parameter suffices for the evaluation of casting surface texture. The S series comparators showed a better description of the surface of castings after shot blasting than the A series. The experiments also show that it is possible to measure the effect of pressure heights on the casting surface roughness.
URL :
http://orbit.dtu.dk/en/publications/surface-roughness-characterization-of-cast-components-using-3d-optical-methods(b3bab9e2-1999-4514-b4f3-4c569ac2fa7c).html
Zasób elektroniczny
Tytuł :
Reproducibility of surface roughness in reaming
Index Terms :
An investigation on the reproducibility of surface roughness in reaming was performed to document the applicability of this approach for testing cutting fluids. Austenitic stainless steel was used as a workpiece material and HSS reamers as cutting tools. Reproducibility of the results was evaluated with respect to different operators, workpieces and measured position in the reamed hole for different combinations of lubrication condition and cutting speed. The measurands were the conventional surface roughness parameter, Ra and the ability of a cutting fluid to ensure a surface which is a replication of tool geometry and path. 2D and 3D reference measurements were done to ensure traceability of the measurement. Moreover, surface profiles were examined under the 3D optical microscope. Measuring uncertainty evaluation using statistical methods was applied. Surfaces produced with a low cutting speed were generally reproducible when considering different operators, workpieces and measured position in the hole, unlike the surfaces produced with high cutting speed. These latter contain uneven, random surface profiles and vary considerably for different operators. However, it can be observed that a higher concentration of the oil in water-based cutting fluid (or when using a straight mineral oil) results in surface profiles that are more reproducible at higher cutting speed. Moreover, it can be seen that three cutting fluids (two water-based cutting fluids with different oil concentration and a straight mineral oil) used in connection with a low cutting speed result in "identical" surface profiles. Biggest uncertainty contributors were due to the process repeatability and repeatability around the hole circumference. This was however only in the case of high cutting speeds and low degree of oil concentration. High reproducibility of different operators, especially when low cutting speed was applied, was achieved. From the surface profiles, an identification of individual fee
URL :
http://orbit.dtu.dk/en/publications/reproducibility-of-surface-roughness-in-reaming(a5857646-a071-4ae0-9e34-d0ddb05a70f2).html
http://orbit.dtu.dk/fedora/objects/orbit:88612/datastreams/file_6271699/content
http://orbit.dtu.dk/fedora/objects/orbit:88612/datastreams/file_6271699/content
Zasób elektroniczny
Tytuł :
Použití fraktální analýzy k hodnocení lomových ploch konstrukčních ocelí o vyšší pevnosti
Index Terms :
fractal analysis
fractal dimension
linear toughness parameter
surface roughness parameter
granular bainite
M/A particles
article
Tytuły dodatkowe :
Application of fractal analysis to evaluation of fracture surfaces in high-strength structural steels
Źródło :
Kovové materiály = Metallic materials Kovové materiály = Metallic materials. 1999, roč. 37, č. 3, s. 184-190.
URL :
http://hdl.handle.net/10084/61745
Kovové materiály = Metallic materials
Zasób elektroniczny

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