scholarly journals Characterization of the Surface Finish of Machined Parts Using Artificial Vision and Hough Transform

10.5772/35182 ◽  
2012 ◽  
Author(s):  
Alberto Rosales ◽  
Angel Xeque-Morales ◽  
L.A. Morales ◽  
Francisco Gallegos
Keyword(s):  
Surface Finish ◽  
Hough Transform ◽  
Artificial Vision ◽  
Machined Parts

Characterization of machined polystyrene foam

1989 ◽  
Vol 47 ◽  
pp. 372-373
Author(s):  
C. W. Price ◽  
E. F. Lindsey ◽  
R. M. Franks ◽  
M. A. Lane
Keyword(s):  
Surface Finish ◽  
Cell Walls ◽  
Surface Structures ◽  
Efficient Technique ◽  
Low Density ◽  
Polystyrene Foam ◽  
Planar Surfaces ◽  
Machining Characteristics

Diamond-point turning is an efficient technique for machining low-density polystyrene foam, and the surface finish can be substantially improved by grinding. However, both diamond-point turning and grinding tend to tear and fracture cell walls and leave asperities formed by agglomerations of fragmented cell walls. Vibratoming is proving to be an excellent technique to form planar surfaces in polystyrene, and the machining characteristics of vibratoming and diamond-point turning are compared.Our work has demonstrated that proper evaluation of surface structures in low density polystyrene foam requires stereoscopic examinations; tilts of + and − 3 1/2 degrees were used for the stereo pairs. Coating does not seriously distort low-density polystyrene foam. Therefore, the specimens were gold-palladium coated and examined in a Hitachi S-800 FESEM at 5 kV.

Characterization of Cutting Parameters in the Minimum Quantity Lubricant (MQL) Machining Process of a Gearbox

2015 ◽  
Vol 5 (1) ◽  
pp. 49-60 ◽  
Author(s):  
J. A. Travieso-Rodriguez ◽  
G. Gomez-Gras ◽  
Silvia Garcia-Vilana ◽  
Ferran Mainau-Noguer ◽  
R. Jerez-Mesa
Keyword(s):  
Cutting Parameters ◽  
Production Costs ◽  
Machining Process ◽  
Machined Parts ◽  
Minimum Quantity Lubricant ◽  
Definition Of ◽  
A Company ◽  
Production Industry ◽  
Different Parts

This paper aims to find the key process parameters for machining different parts of an automobile gearbox, commissioned by a company that needs to replace with the MQL lubrication system their current machining process based on cutting fluids. It particularly focuses on the definition of appropriate cutting parameters for machining under the MQL condition through a statistical method of Design of Experiments (DOE). Using a combination of recommended parameters, significant improvements in the surface roughness of different machined parts are shown. Production costs are also reduced by decreasing expenses on lubricants and by optimizing the cycle time reached under the new cutting conditions, what would help the implementing company to increase its profits and adapt to a modern sustainability-demanding production industry.

Effects of pH, surface finish and thermal treatment on the corrosion of AlFeNi aluminum alloy. Characterization of oxide layers

2015 ◽  
Vol 457 ◽  
pp. 196-204 ◽  
Author(s):  
D. Nabhan ◽  
B. Kapusta ◽  
P. Billaud ◽  
K. Colas ◽  
D. Hamon ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Thermal Treatment ◽  
Surface Finish ◽  
Oxide Layers ◽  
Effects Of Ph

Surface Quality of Cavities Obtained by EDM Process

2011 ◽  
Vol 223 ◽  
pp. 931-939
Author(s):  
Rodrigo Panosso Zeilmann ◽  
Gerson Luiz Nicola ◽  
Fernando Moreira Bordin ◽  
Tiago Vacaro ◽  
Mariana Czarnobay Zanotto
Keyword(s):  
Surface Quality ◽  
Electrical Discharge Machining ◽  
Subsurface Layer ◽  
Side Wall ◽  
Machining Processes ◽  
Electrically Conductive ◽  
Machined Parts ◽  
Edm Process

The electrical discharge machining (EDM) is a process widely used in machining of complex geometries and hardened materials, conditions that often are not met by conventional machining processes. In EDM the electrode reproduces its image or geometry on the part and this image is obtained by chip removing process, which is given by high frequency electrical discharges, causing the melting and vaporization of electrically conductive materials. Due to this mechanism of material removal, the surface is subjected to high thermal loads, which heavily influences the surface quality of obtained parts. For the characterization of these surfaces must be considered the surface topography and the metallurgical changes of the subsurface layer, since both characteristics influence the functionality of the machined parts. In addition, several variables related to the EDM process have influence on the characteristics of the generated surface. This work presents a study of the influence of EDM process on the surface quality of square cavities. It was evaluated different regions of the cavities, such as side wall, bottom and corners. The results showed significant differences between the analyzed regions.

Surface Finish Issues after Direct Metal Deposition

2012 ◽  
Vol 706-709 ◽  
pp. 228-233 ◽  
Author(s):  
P. Peyre ◽  
M. Gharbi ◽  
C. Gorny ◽  
M. Carin ◽  
S. Morville ◽  
...  
Keyword(s):  
Surface Finish ◽  
Experimental Tests ◽  
Metal Deposition ◽  
Direct Metal Deposition ◽  
Physical Mechanisms ◽  
Melt Pool ◽  
3D Profilometry ◽  
Surface Finishes ◽  
3D Shapes

Derived from laser cladding, the Direct Metal Deposition (DMD) laser process, is based upon a laser beam – projected powder interaction, and allows manufacturing complex 3D shapes much faster than conventional processes. However, the surface finish remains critical, and DMD parts usually necessitate post-machining steps. In this context, the focus of our work was: (1) to understand the physical mechanisms responsible for deleterious surface finishes, (2) to propose different experimental solutions for improving surface finish. Our experimental approach is based upon: (1) adequate modifications of the DMD conditions (gas shielding, laser conditions, coaxial or off-axis nozzles), (2) a characterization of laser-powder-melt-pool interactions using fast camera analysis, (3) a precise check of surface aspects using 3D profilometry, SEM, (4) preliminary thermo-convective simulations to understand melt-pool hydrodynamics. Most of the experimental tests were carried out on a Ti6Al4V titanium alloy, widely investigated already. Results confirm that surface degradation depends on two aspects: the sticking of non-melted or partially melted particles on the free surfaces, and the formation of menisci with more or less pronounced curvature radii. Among other aspects, a reduction of layer thickness and an increase of melt-pool volumes to favor re-melting processes are shown to have a beneficial effect on roughness parameters.

Gradient-based Hough transform for the detection and characterization of defects during nondestructive inspection

1997 ◽  
Author(s):  
Lew F. L. Y. Voon ◽  
Patrice Bolland ◽  
Olivier Laligant ◽  
Patrick Gorria ◽  
B. Gremillet ◽  
...  
Keyword(s):  
Hough Transform ◽  
Nondestructive Inspection ◽  
Gradient Based

A Routine to Determine the Shift of Kikuchi Bands in EBSD to Sub-pixel Resolution

2001 ◽  
Vol 7 (S2) ◽  
pp. 366-367
Author(s):  
Xiaodong Tao ◽  
Alwyn Eades
Keyword(s):  
Hough Transform ◽  
Initial Step ◽  
Threading Dislocations ◽  
Standard Analysis ◽  
Pixel Resolution ◽  
Linear Features ◽  
Ebsd Pattern ◽  
Made In

The long-term aim of our research is to detect and image dislocations in the SEM with EBSD. We will apply it first to the characterization of threading dislocations in Si/Si-Ge structures. As an initial step, we set out to detect the shift of the Kikuchi bands in EBSD patterns to sub-pixel precision.In the standard analysis of EBSD patterns, to find the positions of Kikuchi bands, it is usual to use the Hough transform. This transform displays the intensity along all lines in the EBSD pattern, as a function of the position and the angle of the line. Thus linear features in the pattern (Figure 1) appears as peaks in the transform (Figure 2a). in normal EBSD analysis, the aim is to determine the orientation of the grain to a precision of perhaps a degree or two. Therefore, many simplifications are made in the software with the aim of gaining speed.

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