Development of a Virtual Environment for Surface Topomorphy and Roughness Determination in Milling Operations

2008 ◽  
Vol 8 (2) ◽  
Author(s):  
Bilalis Nikolaos ◽  
Petousis Markos
Keyword(s):  
Surface Roughness ◽  
Graphical Model ◽  
Three Dimensional ◽  
Commercial Development ◽  
Machined Surface ◽  
Visualization System ◽  
Milling Operations ◽  
Machined Parts ◽  
Cloud Of Points

Surface roughness is a key parameter for determining the quality of machined parts. A graphical model for the calculation of quantitative data affecting surface roughness of machined surfaces was developed. The model allows the determination of the accurate machined surface in cloud of points form retrieved from the visualization system Z buffer in a three dimensional graphics environment developed in OPENGL. Critical quantitative parameters for surface roughness, such as RaRyRtiRz, and mean line, are determined from this topomorphy. The results together with the operations are visualized in a virtual machine shop environment developed in a commercial development toolkit.

A Virtual Environment for Machining Operations Simulation and Machining Evaluation

2011 ◽  
pp. 88-104
Author(s):  
Bilalis Nicolaos ◽  
Petousis Markos
Keyword(s):  
Surface Roughness ◽  
Virtual Environment ◽  
Quantitative Data ◽  
Graphical Model ◽  
Machined Surface ◽  
Visualization System ◽  
Machined Surface Roughness ◽  
Machining Operations ◽  
Cloud Of Points

A virtual reality machine shop environment has been developed capable of simulating the operation of a three axis milling machine and it has been integrated with a graphical model for the calculation of quantitative data affecting the machined surface roughness. The model determines the machined surface topomorphy as a cloud of points, retrieved from the visualization system Z buffer. The current study describes the developed model for milling processes simulation in a virtual environment and the determination of the surface roughness of the processed surfaces. Also, the methodology for the verification of the quantitative data acquired by the system is presented. Results were verified with data determined in cutting experiments and by another numerical model that was integrated to the system.

A Virtual Environment for Machining Operations Simulation and Machining Evaluation

2011 ◽  
pp. 596-613
Author(s):  
Bilalis Nicolaos ◽  
Petousis Markos
Keyword(s):  
Surface Roughness ◽  
Virtual Environment ◽  
Quantitative Data ◽  
Graphical Model ◽  
Machined Surface ◽  
Visualization System ◽  
Machined Surface Roughness ◽  
Machining Operations ◽  
Cloud Of Points

A virtual reality machine shop environment has been developed capable of simulating the operation of a three axis milling machine and it has been integrated with a graphical model for the calculation of quantitative data affecting the machined surface roughness. The model determines the machined surface topomorphy as a cloud of points, retrieved from the visualization system Z buffer. The current study describes the developed model for milling processes simulation in a virtual environment and the determination of the surface roughness of the processed surfaces. Also, the methodology for the verification of the quantitative data acquired by the system is presented. Results were verified with data determined in cutting experiments and by another numerical model that was integrated to the system.

VESTA 3for three-dimensional visualization of crystal, volumetric and morphology data

2011 ◽  
Vol 44 (6) ◽  
pp. 1272-1276 ◽  
Author(s):  
Koichi Momma ◽  
Fujio Izumi
Keyword(s):  
Search Algorithm ◽  
Voronoi Tessellation ◽  
Three Dimensional ◽  
Structure Parameters ◽  
Volumetric Data ◽  
Complex Molecules ◽  
Visualization System ◽  
Performance Improvements ◽  
Significant Performance

VESTAis a three-dimensional visualization system for crystallographic studies and electronic state calculations. It has been upgraded to the latest version,VESTA 3, implementing new features including drawing the external morphology of crystals; superimposing multiple structural models, volumetric data and crystal faces; calculation of electron and nuclear densities from structure parameters; calculation of Patterson functions from structure parameters or volumetric data; integration of electron and nuclear densities by Voronoi tessellation; visualization of isosurfaces with multiple levels; determination of the best plane for selected atoms; an extended bond-search algorithm to enable more sophisticated searches in complex molecules and cage-like structures; undo and redo in graphical user interface operations; and significant performance improvements in rendering isosurfaces and calculating slices.

scholarly journals Surface Integrity Investigation to Determine Rough Milling Effects for Assessment of Machining Allowance for Subsequent Finish Milling of Alloy 718

2021 ◽  
Vol 5 (2) ◽  
pp. 48
Author(s):  
Jonas Holmberg ◽  
Anders Wretland ◽  
Johan Berglund ◽  
Tomas Beno ◽  
Anton Milesic Karlsson
Keyword(s):  
Surface Integrity ◽  
Milling Process ◽  
Depth Of Cut ◽  
Machined Surface ◽  
Milling Operations ◽  
Milling Operation ◽  
Machining Allowance ◽  
Rough Milling

The planned material volume to be removed from a blank to create the final shape of a part is commonly referred to as allowance. Determination of machining allowance is essential and has a great impact on productivity. The objective of the present work is to use a case study to investigate how a prior rough milling operation affects the finish machined surface and, after that, to use this knowledge to design a methodology for how to assess the machining allowance for subsequent milling operations based on residual stresses. Subsequent milling operations were performed to study the final surface integrity across a milled slot. This was done by rough ceramic milling followed by finish milling in seven subsequent steps. The results show that the up-, centre and down-milling induce different stresses and impact depths. Employing the developed methodology, the depth where the directional influence of the milling process diminishes has been shown to be a suitable minimum limit for the allowance. At this depth, the plastic flow causing severe deformation is not present anymore. It was shown that the centre of the milled slot has the deepest impact depth of 500 µm, up-milling caused an intermediate impact depth of 400 µm followed by down milling with an impact depth of 300 µm. With merged envelope profiles, it was shown that the effects from rough ceramic milling are gone after 3 finish milling passes, with a total depth of cut of 150 µm.

scholarly journals Determination of Emissivity of Brass Alloy using Infrared Thermographic Technique

2018 ◽  
Vol 65 (3) ◽  
pp. 115-121
Author(s):  
Zorana Lanc ◽  
Milan Zeljković ◽  
Aleksandar Živković ◽  
Branko Štrbac ◽  
Miodrag Hadžistević
Keyword(s):  
Surface Roughness ◽  
Regression Analysis ◽  
Multiple Regression ◽  
Strong Correlation ◽  
Three Dimensional ◽  
Multiple Regression Model ◽  
Infrared Images ◽  
Cooling Process ◽  
Brass Alloy

Abstract This paper presents the experimental determination of the dependence of emissivity of brass on surface roughness and temperature. The investigation was conducted using the infrared thermographic technique on brass alloy C27200 workpieces with different degrees of surface roughness, during the continuous cooling process. The results obtained showed that the emissivity of the chosen brass alloy increases with greater surface roughness and decreases during the cooling process, its value ranging from 0.07 to 0.19. It was concluded that surface roughness has a greater influence on the increase of the emissivity at higher temperatures, which can be seen in the three-dimensional infrared images. Multiple regression analysis confirmed a strong correlation between the examined parameters and the emissivity, and an original multiple regression model was determined.

A Study of the Impact of Workpiece Location on Machining Performance of a 2-DoF PKM Based Machine Tool

2013 ◽  
Author(s):  
A. B. Koteswara Rao ◽  
Sanjay Darvekar ◽  
K. Ramji
Keyword(s):  
Surface Roughness ◽  
End Milling ◽  
Structural Deformation ◽  
Quality Level ◽  
Machining Performance ◽  
Machined Surface ◽  
Milling Operations ◽  
Milling Operation ◽  
Tool Position ◽  
The Impact

This paper presents the impact of workpiece location on the machining performance of a 2-degree of freedom Parallel Kinematic Machine (PKM) tool. The PKM behavior is highly non-uniform and depends on the tool position within the workspace. The structural deformation and vibration due to cutting loads affect the quality of machined surfaces. The aim of the present study is to find the optimal tool position (workpiece location) where the workpiece is machined to a specific quality level. End-milling operations are carried out at various locations within the workspace and the surface roughness of machined surface (Ra) is measured at each location. A regression model is developed to predict the surface roughness. The study shows that the workpiece location has significant impact upon surface roughness of the machined part. Finally, a suitable workspace is defined for end-milling operation.

Surface Texture’s Role in Assessing Surface Integrity of Machined Parts

2010 ◽  
Vol 34-35 ◽  
pp. 1145-1148
Author(s):  
Quan Ren Zeng ◽  
Geng Liu ◽  
Lan Liu ◽  
Rui Ting Tong
Keyword(s):  
Surface Roughness ◽  
Surface Integrity ◽  
Surface Texture ◽  
Functional Performance ◽  
Fatigue Property ◽  
Roughness Parameters ◽  
Machined Surface ◽  
Surface Roughness Parameters ◽  
Machined Parts

Surface texture, as one of the typical surface integrity characteristics, plays a vital part in efficiently and systematically evaluating the surface integrity and relevant mechanical properties of machined parts. Commonly used 2D surface roughness parameters are formularized and discussed in this paper. And 3D characterization technique is also illustrated through measuring and describing a machined surface with an optical profiling system. The relationship between surface texture and the fatigue property of final machined parts are discussed by employing the quantity of effective stress concentration factor which could be expressed by the standard surface roughness parameters and measured averaged root radius of surface texture’s valleys. This research emphasizes the indispensable role of the surface texture in evaluating surface integrity and corresponding functional performance of machined parts.

Measurement Accuracy Problems of the Surface Texture Parameters

2017 ◽  
Vol 260 ◽  
pp. 227-234
Author(s):  
Natalija Bulaha ◽  
Janis Lungevics ◽  
Janis Rudzitis
Keyword(s):  
Surface Roughness ◽  
Measurement Accuracy ◽  
Three Dimensional ◽  
Longitudinal Direction ◽  
Scientific Article ◽  
Roughness Parameters ◽  
Texture Parameters ◽  
Correlation Interval ◽  
Dimensional Surface

In this scientific article the recommendations for a three-dimensional surface roughness parameters determination of mechatronics elements are developed. First of all, the measurements for surface with irregular roughness were made, what led to the determination of a 3D roughness correlation function. On that basis correlation interval in two perpendicular treatment directions was calculated and associated with number of surface roughness uncorrelated points. Secondly, the surface roughness step parameters evaluation precision in two mutually perpendicular directions was analysed. Particular attention was paid to the roughness average step RSm in the treatment longitudinal direction. As a result, the recommendations for a 3D roughness parameters determination were prepared.

scholarly journals Investigating the Design of Condition Monitoring Systems to Evaluate Surface Roughness under the Variability in Tool Wear and Fixturing Conditions

2013 ◽  
Vol 572 ◽  
pp. 467-470 ◽  
Author(s):  
Jabbar Abbas ◽  
Amin Al-Habaibeh ◽  
Dai Zhong Su
Keyword(s):  
Surface Roughness ◽  
Tool Wear ◽  
Condition Monitoring ◽  
End Milling ◽  
Milling Operations ◽  
Different Types ◽  
Machined Parts ◽  
Condition Monitoring Systems ◽  
Condition Monitoring System

Surface finish of machined parts in end milling operations is significantly influenced by process faults such as tool wear and tool holding (fixturing system). Therefore, monitoring these faults is considerably important to improve the quality of the product. In this paper, an investigation is presented to design the condition monitoring system to evaluate the surface roughness of the workpiece under effects of gradual tool wear and different types of the fixturing system. Automated Sensor and Signal Processing Selection (ASPS) approach is implemented and tested to determine the sensitivity of the sensory signals to estimate surface roughness under the variable conditions in comparison to surface roughness measurement device. The results indicate that the system is capable of detection the change and the trend in surface roughness. However, the sensitive features are found to be different based on the change in the fixturing system.

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