Optimal adjustment of a machine tool for improving the geometrical quality of machined parts

2004 ◽  
Vol 26 (5-6) ◽  
pp. 559-564 ◽  
Author(s):  
Patrick Martin ◽  
Fabien Schneider ◽  
Jean-Yves Dantan
Keyword(s):  
Machine Tool ◽  
Geometrical Quality ◽  
Machined Parts ◽  
Optimal Adjustment

scholarly journals Towards Managing Visual Pollution: A 3D Isovist and Voxel Approach to Advertisement Billboard Visual Impact Assessment

2021 ◽  
Vol 10 (10) ◽  
pp. 656
Author(s):  
Szymon Chmielewski
Keyword(s):  
Cultural Context ◽  
Policy Makers ◽  
Quality Issue ◽  
Geometrical Quality ◽  
Visual Landscape ◽  
Landscape Quality ◽  
Visual Impact ◽  
The Impact ◽  
Visible Volume

Visual pollution (VP) is a visual landscape quality issue, and its most consistently recognized symptom is an excess of out of home advertising billboards (OOHb). However, the VP related research concerns landscape aesthetic and advertisement cultural context, leaving the impact of outdoor billboard infrastructure on landscape openness unanswered to date. This research aims to assess the visual impact of outdoor billboard infrastructure on landscape openness, precisely the visual volume—a key geometrical quality of a landscape. The method uses 3D isovists and voxels to calculate the visible and obstructed subsets of visible volume. Using two case studies (Lublin City, Poland) and 26 measurement points, it was found that OOHb decreased landscape openness by at least 4% of visible volume; however, the severe impact may concern up to 35% of visual volume. GIS scientists develop the proposed method for policy-makers, and urban planners end users. It is also the very first example of compiling 3D isovists and voxels in ArcGIS Pro software in an easy-to-replicate framework. The research results, accompanied by statistically significant proofs, explain the visual landscape’s fragility and contribute to understanding the VP phenomenon.

Nature’s Mathematics

2019 ◽  
pp. 17-36
Author(s):  
Thomas Owens
Keyword(s):  
Material World ◽  
Geometrical Quality ◽  
Mathematical Expressions ◽  
The World ◽  
The Mind ◽  
Theological Vision

Chapter 1 explores the geometrical quality of Wordsworth’s and Coleridge’s imaginative commitments. Focusing principally on The Pedlar, the Guide to the Lakes, and Coleridge’s Notebooks, the chapter locates the origins of Wordsworth’s and Coleridge’s geometric visions in a divinely relational language of shapes which they intuited as children to describe the world about them and which moulded their shared Pedlar consciousness in the 1790s. It proposes that Wordsworth and Coleridge sustained the mathematical expressions of the Pedlar’s ethico-theological vision in their dealings with nature and the mind, perceiving in the material world a language of geometric forms which held it together.

Vibration Analysis of Radial Drilling Machine Structure Using Finite Element Method

2012 ◽  
Vol 472-475 ◽  
pp. 2717-2721 ◽  
Author(s):  
Rajiv Kumar ◽  
Mohinder Pal Garg ◽  
Rakesh C. Sharma
Keyword(s):  
Machine Tool ◽  
Natural Frequency ◽  
Mode Shapes ◽  
Drilling Machine ◽  
Element Analysis ◽  
Stiffness Matrices ◽  
Machine Tool Structure ◽  
Radial Drilling ◽  
Machine Structure

Manufacturing industries now a days have stringent expectation from the machine tools in terms of productivity as well as quality of products.Vibration plays an important role in determining the quality of product.If the pattern of vibration prevailing in the machine tool during cutting is known,then machine tool structure can be designed in such a way so that natural frequency of machine tool structure can be isolated from the forced frequency.So, this study is focused on finding the natural frequency and mode shapes of radial drilling machine structure.Finite element analysis has been done to find out the natural frequencies and mode shapes of radial drilling machine structure.Assembled mass and stiffness matrices are obtained for each element and solved by using inverse iteration technique.

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.

Fuzzy Synthesized Evaluation of Product Quality of Machine Tool Based on Harmonious Design Method

2009 ◽  
Vol 16-19 ◽  
pp. 1382-1386
Author(s):  
Chun Shi Liu ◽  
Xiao Peng Li ◽  
Wei Sun ◽  
Yi Min Zhang
Keyword(s):  
Machine Tool ◽  
Product Quality ◽  
Evaluation Method ◽  
Design Method ◽  
Price Ratio ◽  
Design Quality ◽  
Product Function ◽  
Working Capability ◽  
One Machine

In this work, it is presented and studied that the harmonious of product function with capability, harmonious of product with product, harmonious of product with people, with technology, with society environment, with entironment from the view of entironment, society, economy, science, politics, culture and legal point in the design process. And the quality verification and evaluation methods are studied to enhance the design quality more effectively. And that, all the studied contents is named harmonious design method. One machine tool is used as an example to explain the method with design quality evaluated by fuzzy synthesized evaluation method from function, structure capability, working capability and craftwork capability factors. The grade and disparity of design quality are obtained through the evaluation results, then design project could be modified based on it, and it is very useful to improve product quality and to enhance performance-price ratio and market competitive ability.

Machine Integrated Measurement of Ultra Precision Machined Specular Non-Rotational Symmetrical Surfaces

2014 ◽  
Vol 907 ◽  
pp. 277-289 ◽  
Author(s):  
Eckart Uhlmann ◽  
Gerhard Häusler ◽  
Christian Röttinger ◽  
Evelyn Olesch ◽  
Christian Faber ◽  
...  
Keyword(s):  
Machine Tool ◽  
Optical Measurement ◽  
Installation Space ◽  
Precision Machining ◽  
Test Surface ◽  
Full Field ◽  
Rotationally Symmetric ◽  
Ultra Precision ◽  
Height Data

In this paper, current results of a research project combining ultra precision machining and optical measurement are presented. The goal is to improve the quality of specular freeform surfaces manufactured by ultra precision slow slide servo turning by running appropriate correction cycles on the basis of machine integrated measurements. These measurements are conducted using the principle of Phase Measuring Deflectometry (PMD) in order to optically acquire full-field 3D-height data. For this purpose, a special setup the so called Mini PMD that can be operated within the limited installation space of an ultra precision machine tool has been designed and implemented. Results of machine integrated measurements of a specular non-rotational symmetrical surface are presented. Furthermore, using Mini PMD and a rotationally symmetric test surface, a complete correction cycle is demonstrated without the necessity of taking the workpiece off the machine for measurement.

scholarly journals STUDY OF THE INFLUENCE OF CUTTING FLUID AMOUNT IN STEEL TURNING OF AISI 52100

2020 ◽  
Vol 5 (7) ◽  
pp. 49-56
Author(s):  
Ítalo de Abreu Gonçalves ◽  
Leonardo Leite ◽  
Tarcísio G. De Brito ◽  
Emerson J. De Paiva ◽  
Carlos H. De Oliveira ◽  
...  
Keyword(s):  
Cutting Tools ◽  
Roughness Parameter ◽  
Cutting Speed ◽  
Cutting Fluid ◽  
Machined Surface ◽  
Aisi 52100 ◽  
Machined Parts ◽  
Steel Turning ◽  
Good Productivity

The steel turning AISI 52100 has been gaining prominence in industry in recent years, as it allows machined parts to have better quality without the need for furthers processes. However, to ensure the final product quality, it is important that the turning for machining procedure is well planned and prepared, so that the cutting tools have their wear minimized in the process, while putting good productivity rates and zero occurrences of reworked parts. Thus, this article will study the quality of the machined surface in the turning process using interchangeable PCBN inserts. The aim is to identify the optimal combination of the input parameters that are cutting speed (Vc), feed (f) and machining depth (ap). The response measured is the roughness parameter Ra, under the influence of cutting fluid and tool wear.

scholarly journals Surface Roughness Prediction and Minimization in 5-Axis Milling Operations of Gas Turbine Blades

2021 ◽  
Author(s):  
Arameh Eyvazian ◽  
Farayi Musharavati ◽  
Afrasyab Khan ◽  
Mohsen Soori ◽  
Tamer A. Sebaey ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Gas Turbine ◽  
Turbine Blades ◽  
Machining Process ◽  
Machining Parameters ◽  
Gas Turbine Blades ◽  
Virtual Machining ◽  
Machined Parts ◽  
Machining System

Abstract To enhance the quality of machined parts, virtual machining systems are presented in this study. In the turbine blades, the minimization of the surface roughness of the blades can decrease the Reynolds number to decrease the loss of energy in power generation. Due to difficulties of polishing process in minimizing the surface roughness of machined blades, the optimized machining parameters for minimizing the surface roughness is an effective solution for the problem. In this study, a virtual machining system is developed to predict and minimize the surface roughness in 5-Axis machining operations of gas turbine blades. To minimize the surface roughness, the machining parameters were optimized by the Genetic algorithm. To validate the developed system, the turbine blades were machined using a 5-Axis CNC machine tool and the machined blades were measured using the CMM machine to obtain the surface roughness of machined parts. So, a 41.29% reduction in the measured surface roughness and a 42.09% reduction in the predicted surface roughness are obtained using the optimized machining parameters. The developed virtual machining system can be applied in the machining process of turbine blades to enhance the surface quality of machined blades and thus improve the efficiency of gas turbines.

Sign in / Sign up

Export Citation Format

Share Document