Comparative analysis between a CAD model design and physical models obtained by manufacturing additive technologies using optical scan

2011 ◽  
pp. 797-800
Author(s):  
F de Alencar ◽  
P Bártolo
Keyword(s):  
Comparative Analysis ◽  
Additive Technologies ◽  
Physical Models ◽  
Cad Model ◽  
Model Design ◽  
Optical Scan

scholarly journals Process Optimization Variables for Direct Metal Laser Sintering

2015 ◽  
Vol 15 (4) ◽  
pp. 38-51 ◽  
Author(s):  
Ż. A. Mierzejewska
Keyword(s):  
Selective Laser Sintering ◽  
Minimum Energy ◽  
Systems Design ◽  
Laser Sintering ◽  
Physical Models ◽  
Cad Model ◽  
Direct Metal Laser Sintering ◽  
3D Cad ◽  
Short Period ◽  
Wide Range

AbstractManufacturing is crucial to creation of wealth and provision of quality of life. Manufacturing covers numerous aspects from systems design and organization, technology and logistics, operational planning and control. The study of manufacturing technology is usually classified into conventional and non-conventional processes. As it is well known, the term "rapid prototyping" refers to a number of different but related technologies that can be used for building very complex physical models and prototype parts directly from 3D CAD model. Among these technologies are selective laser sintering (SLS) and direct metal laser sintering (DMLS). RP technologies can use wide range of materials which gives possibility for their application in different fields. RP has primary been developed for manufacturing industry in order to speed up the development of new products (prototypes, concept models, form, fit, and function testing, tooling patterns, final products - direct parts). Sintering is a term in the field of powder metallurgy and describes a process which takes place under a certain pressure and temperature over a period of time. During sintering particles of a powder material are bound together in a mold to a solid part. In selective laser sintering the crucial elements pressure and time are obsolete and the powder particles are only heated for a short period of time. SLS uses the fact that every physical system tends to achieve a condition of minimum energy. In the case of powder the partially melted particles aim to minimize their in comparison to a solid block of material enormous surface area through fusing their outer skins. Like all generative manufacturing processes laser sintering gains the geometrical information out of a 3D CAD model. This model is subdivided into slices or layers of a certain layer thickness. Following this is a revolving process which consists of three basic process steps: recoating, exposure, and lowering of the build platform until the part is finished completely.

Reverse Engineering Physical Models Employing Wrap-Around B-Spline Surfaces and Quadrics

1996 ◽  
Vol 210 (2) ◽  
pp. 147-157 ◽  
Author(s):  
D J Weir ◽  
M J Milroy ◽  
C Bradley ◽  
G W Vickers
Keyword(s):  
Reverse Engineering ◽  
Computer Aided Design ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Surface Fitting ◽  
Physical Models ◽  
Scanning System ◽  
Cad Model ◽  
Three Dimensional Model ◽  
B Spline

Reverse engineering involves digitizing a three-dimensional model or part, by means of a tactile or non-contact optical sensor, converting the data to a CAD (computer aided design) database description and manufacturing by CNC (computer numerical controlled) machines. This paper demonstrates an effective approach to the reverse engineering of physical models by employing a three-dimensional laser scanning system in conjunction with surface-fitting software developed by the authors. Accurate surface data are collected by the laser scanner and then input to the surface-fitting software. Surface entities such as B-spline and quadric functions are employed to build the CAD model. The CAD model is compatible with popular design and manufacturing software packages. A telephone receiver is used to illustrate the efficiency of the process.

scholarly journals APPLICATION OF ADDITIVE TECHNOLOGIES IN MODERN FOUNDRY PRODUCTION

2021 ◽  
Vol 117 (2) ◽  
pp. 20-27
Author(s):  
Zhannur Begendikova ◽  
Amina Bukayeva
Keyword(s):  
Laser Beam ◽  
New Products ◽  
Machine Building ◽  
Global Market ◽  
Model Material ◽  
Additive Technologies ◽  
The Body ◽  
Cad Model ◽  
High Quality ◽  
Building Products

The paper studies and analyzes the use of additive technologies in modern foundry production, determining their innovative development to create new products with high quality, reliability and determining its competitiveness in the world market of machine-building products. The essence of SLS-technology is defined as follows: model material - polystyrene powder with particle size of 50-150 microns - is rolled by a special roller on the working platform installed in a sealed chamber with an inert gas atmosphere - nitrogen. The laser beam "runs" where the computer "sees" the "body" in the given section of the CAD-model, as if "shading" the section of the part, as it is done by the constructor with a pencil on the drawing. In this case the laser beam is a source of heat, under the influence of which sintering of polystyrene particles takes place (working temperature - about 120°С). SLA, Polyjet and DLP technologies are the most widespread for metal casting. The first method involves sequential "running" of the laser beam over the entire surface of the layer to be formed where the model "body" is in the cross section. The second method of curing is performed by a beam in the form of a line in the process of layer formation due to radiation from a controlled ultraviolet lamp. The third way implies illumination of the whole layer simultaneously by creating the so-called mask - a "photo" of the current CAD-model section. Thus, additive technologies in modern foundry production have radically reduced labor intensity and costs of creating new products, which have high quality and reliability indicators and determine their competitiveness in the global market of machine-building products.

A Comparative Analysis of Psychological and Physical Models of Low Back Pain Experience

Physiotherapy ◽  
1995 ◽  
Vol 81 (12) ◽  
pp. 710-716 ◽  
Author(s):  
Michael J Rose ◽  
James P Reilly ◽  
Peter D Slade ◽  
Michael Dewey
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Comparative Analysis ◽  
Physical Models ◽  
Low Back ◽  
Pain Experience

Data Types Diversity Quantitative Indicators in Relational Databases Physical Models

TEM Journal ◽  
2020 ◽  
pp. 862-867
Author(s):  
Alexander Aleksandrovich Rybanov ◽  
Makushkina Lidiya Aleksandrovna
Keyword(s):  
Comparative Analysis ◽  
Relational Databases ◽  
Diversity Index ◽  
Diversity Indices ◽  
Physical Models ◽  
Qualitative Assessment ◽  
Data Types ◽  
New Models ◽  
Evenness Index ◽  
Quantitative Indicators

The article compares diversity indices applicability used in ecology to assess data types distribution for physical database schemes. The following dominance measures are used to assess the data type's diversity in the physical database scheme: Simpson's diversity index, Shannon diversity index, Simpson's evenness index, Pielu evenness index. A comparative analysis of the data type's diversity indicators for physical database schemes showed that the values of some indices obey certain rules. It is proposed to use diversity indices for physical database schemes' qualitative assessment. The indices considered in this work can also be used to build new models for assessing database complexity.

Knowledge Based Reverse Engineering—An Approach for Reverse Engineering of a Mechanical Part

2010 ◽  
Vol 10 (4) ◽  
Author(s):  
A. Durupt ◽  
S. Remy ◽  
G. Ducellier
Keyword(s):  
Reverse Engineering ◽  
Point Of View ◽  
Physical Models ◽  
Cad Model ◽  
Virtual Model ◽  
Current Interest ◽  
Mechanical Part ◽  
Knowledge Based ◽  
Geometric Point ◽  
Good For

Reverse engineering (RE) is a domain of current interest where physical models are measured or digitized in order to obtain a virtual model. Currently, these virtual models are rebuilt using approaches that consider only a geometric point of view. These models are generally frozen (i.e., poorly parameterized and not easy to modify). These kinds of models are good for many applications but people need more for redesign operations. This paper proposes a knowledge-based approach for reverse engineering that enables a RE user to rebuild nonfrozen models that are close to an original CAD model.

scholarly journals Tailor-made 3D model design of human implants for additive technologies

2018 ◽  
Vol 448 ◽  
pp. 012060
Author(s):  
Laura Georgina Varga ◽  
János Takács ◽  
Ferenc Dömötör
Keyword(s):  
3D Model ◽  
Additive Technologies ◽  
Model Design
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