scholarly journals Computer verification of the production cycle implemented on swiss-type lathe

Mechanik ◽  
2018 ◽  
Vol 91 (7) ◽  
pp. 558-560
Author(s):  
Piotr Sikora ◽  
Marcin Sobiegraj ◽  
Andrzej Zaborski
Keyword(s):  
Computer Simulation ◽  
Automatic Machine ◽  
Production Cycle ◽  
Nc Code ◽  
Processing Machine ◽  
Cad Cam ◽  
Actual Creation ◽  
Cam Systems

The study presents the possibility of using CAD/CAM systems for computer simulation of the process of making the detail on a numeric processing machine. The paper describes an exemplary process of verification of the element’s creation using SD EDITOR software and the actual creation of the product on the Star ECAS-20 longitudinal automatic machine based on the verified NC code.

scholarly journals Computer-aided preparation of detail production on numerically controlled lathes

Mechanik ◽  
2019 ◽  
Vol 92 (8-9) ◽  
pp. 594-596
Author(s):  
Marcin Sobiegraj ◽  
Piotr Sikora ◽  
Andrzej Zaborski
Keyword(s):  
Computer Simulation ◽  
Production Process ◽  
Coordinate Measuring Machine ◽  
Control Software ◽  
Computer Aided ◽  
Cad Cam ◽  
Measuring Machine ◽  
Cam Systems

The study presents the possibility of using modern CAD/CAM systems for computer simulation of the process of making the detail on a numerically controlled lathe MIYANO BNA 42GTY. The Alkard CNC Wizard software was used. To verify the correctness of the implemented production process, a coordinate measuring machine Zeiss Prismo 5 with a Renishaw PH-20 head was used. The measurements were carried out using the Modus control software.

Application of CAD/CAM Systems for Computer Simulation of Metal Forming Processes

2011 ◽  
Vol 704-705 ◽  
pp. 434-439 ◽  
Author(s):  
K.N. Solomonov
Keyword(s):  
Computer Simulation ◽  
Metal Forming ◽  
Metal Flow ◽  
Special Cases ◽  
Cad Cam ◽  
Graphical System ◽  
Contact Pressures ◽  
Cam Systems

It is shown that application of graphic techniques and CAD/CAM systems for solving problems of metal forming makes it possible to obtain satisfactory results. Using well known COMPAS graphical system, it is possible to plot diagrams of contact pressures for some special cases. PARSHTAMP software developed by authors enables to calculate boundary dividing lines of metal flow during deformation of flat preforms.

scholarly journals Application of Computer Simulation in Design and Calculation of Apparatus for Industrial Hemp Cutting

2020 ◽  
pp. 66-70
Author(s):  
Р.А. Попов ◽  
И.Л. Абрамов
Keyword(s):  
Energy Efficiency ◽  
Computer Simulation ◽  
Energy Efficient ◽  
Design And Optimization ◽  
Blade Shape ◽  
Cad Cam ◽  
State Models ◽  
Industrial Hemp ◽  
Cam Systems ◽  
Main Influence

В статье рассмотрены некоторые вопросы конструирования и оптимизации режущего аппарата коноплеуборочной машины. Обоснована необходимость применения компьютерного моделирования при разработке рабочих органов коноплеуборочной техники, а именно возможность значительного снижения материальных и временных затрат на проектирование. Кроме того, применение современных CAD/CAM систем позволяет упростить и ускорить изготовление разработанных с их помощью агрегатов и составных частей. В работе проведено компьютерное моделирование с использованием пакета SolidWorks 2020, с помощью которого были созданы твёрдотельные модели режущего диска для коноплеуборочной машины с трапециевидной и параболической формами режущего зуба. Формы зуба в виде трапеции и элемента параболы выбраны на основании произведённых расчётов на прочность и надёжность, для чего были построены эпюры механических напряжений, деформаций и перемещений для обеих моделей. Также с применением моделирования проведён расчёт коэффициента запаса прочности для различных вариантов диска с разной формой режущих зубьев. Выявлено, что в плане надёжности более эффективным является режущий диск с зубьями, имеющими параболическую форму лезвия. Наряду с этим оценена энергоэффективность применения режущих дисков с зубьями различной формы. Теоретический расчёт показал, что основное влияние на энергоэффективность процесса срезания стебля конопли оказывает угол, образуемый формой зуба. Оптимальной является форма зуба с наименьшим углом. Это свидетельствует о том, что зуб с параболической формой лезвия является более эффективным с точки зрения затрачиваемой энергии на срез стебля. Таким образом, в плане надёжности более энергоэффективным является режущий диск с зубьями, имеющими параболическую форму лезвия. The article approaches some problems of the design and optimization of the hemp harvesting machine cutter bar. The necessity of application of computer simulation in development of working tools of hemp harvesting equipment is justified, namely possibility of significant reduction of material and time costs for design. In addition, the use of modern CAD/CAM systems allows you to simplify and accelerate the production of units and components developed using them. Computer modeling was carried out in the work using the SolidWorks 2020 package, with the help of which solid-state models of a cutting disk for a hemp harvesting machine with a trapezoidal and parabolic shape of a cutting tooth were created. The shapes of the tooth in the form of a trapezoid and a parabola element were chosen on the basis of calculations for strength and reliability, for which epures of mechanical stresses, deformations and movements for both models were built. Also, using modeling, a safety factor was calculated for various versions of a disk with a different shape of cutting teeth. It was revealed that in terms of reliability, a cutting disk with teeth having a parabolic blade shape is more effective. Along with that the energy efficiency of using cutting discs with teeth of various shapes is evaluated. The theoretical calculation showed that the main influence on the energy efficiency of the process of cutting the hemp stem is the angle formed by the shape of the tooth. Optimal is the shape of the tooth with the lowest angle. This indicates that a tooth with a parabolic blade shape is more efficient in terms of energy spent on the stem cut. Thus, in terms of reliability, a cutting disk with teeth having a parabolic blade shape is more energy efficient.

ANALYSIS OF THE PRICE OF THE MANUFACTURE OF BATCH PARTS FOR CNC MILLING AUXILIATED BY CAD / CAM SYSTEMS

2018 ◽  
Author(s):  
ERIC RAMALHO FERREIRA DE CARVALHO ◽  
MARCOS VINICYUS OLIVEIRA ◽  
erijanio Silva ◽  
Gutembergy Diniz ◽  
João Dehon Rocha Junior ◽  
...  
Keyword(s):  
Cnc Milling ◽  
Cad Cam ◽  
Cam Systems

scholarly journals Marginal and Internal Fit of Ceramic Prostheses Fabricated from Different Chairside CAD/CAM Systems: An In Vitro Study

2021 ◽  
Vol 11 (2) ◽  
pp. 857
Author(s):  
Keunbada Son ◽  
Kyu-Bok Lee
Keyword(s):  
Computer Aided Design ◽  
In Vitro Study ◽  
Vitro Study ◽  
Marginal Gap ◽  
Significant Difference ◽  
Cad Cam ◽  
Ceramic Crowns ◽  
Internal Fit ◽  
Cam Systems

The purpose of this in vitro study was to evaluate marginal and internal fits of ceramic crowns fabricated with chairside computer-aided design and manufacturing (CAD/CAM) systems. An experimental model based on ISO 12836:2015 was digitally scanned with different intraoral scanners (Omnicam (CEREC), EZIS PO (DDS), and CS3500 (Carestream)). Ceramic crowns were fabricated using the CAD/CAM process recommended by each system (CEREC, EZIS, and Carestream systems; N = 15). The 3-dimensional (3D) marginal and internal fit of each ceramic crown was measured using a 3D inspection software (Geomagic control X). Differences among the systems and various measurements were evaluated using the Kruskal–Wallis test. Statistically significant differences were validated using pairwise comparisons (α = 0.05). Occlusal gaps in the CEREC, EZIS, and Carestream groups were 113.0, 161.3, and 438.2 µm, respectively (p < 0.001). The axial gaps were 83.4, 78.0, and 107.9 µm, respectively. The marginal gaps were 77.8, 99.3, and 60.6 µm, respectively, and the whole gaps were 85.9, 107.3, and 214.0 µm, respectively. Significant differences were observed with the EZIS system compared with the other two systems in terms of the marginal gap sizes. The CEREC system showed no significant differences among the four measured regions. However, the EZIS and Carestream systems did show a statistically significant difference (p < 0.05). All three systems were judged to be capable of fabricating clinically acceptable prostheses, because the marginal gap, which is the most important factor in the marginal fit of prostheses, was recorded to be below 100 µm in all three systems.

Machining Feature-Based CAD/CAPP for STEP-NC

2014 ◽  
Vol 598 ◽  
pp. 591-594 ◽  
Author(s):  
Li Yan Zhang
Keyword(s):  
Process Planning ◽  
Manufacturing Process ◽  
Data Transfer ◽  
Operation Planning ◽  
Computer Aided Process Planning ◽  
Machining Feature ◽  
Computer Aided ◽  
Cad Cam ◽  
Feature Based ◽  
Cam Systems

ISO 14649, known as STEP-NC, is new model of data transfer between CAD/CAM systems and CNC machines. In this paper, the modeling based on machining feature is proposed. The machining feature comes from the manufacturing process considering the restriction of machining technology and machining resource. Then the framework for computer aided process planning is presented, where the algorithms of operation planning is studied. The practical example has been provided and results indicate that machining feature based model can integrate with CAPP and STEP-NC seamlessly.

Effect of Particle Size of ZrO2(Y2O3) Powders on the Shrinkage of the Sintered Substrate with Coloring Gradient

2014 ◽  
Vol 87 ◽  
pp. 162-168
Author(s):  
Paula Cipriano da Silva ◽  
Roberto de Oliveira Magnago ◽  
Camila Aparecida Araujo da Silva ◽  
Bianca de Almeida Fortes ◽  
Claudinei dos Santos
Keyword(s):  
White Layer ◽  
Linear Shrinkage ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Particles Size Distribution ◽  
Cad Cam ◽  
Effect Of Particle Size ◽  
Cam Systems ◽  
Zirconia Powders

ZrO2(Y2O3)-based ceramics with coloring gradient can facilitate the development of dental prosthesis by the improvement of esthetic properties. In this work, ZrO2 powders with different particle sizes were investigated. White and yellow zirconia powders (TOSOH Corporation-Japan) were characterized by particles size distribution using nanoSight-LM20 analyzer. Furthermore, samples were characterized by X-Ray diffraction, Scanning Electron Microscopy and relative density. Compacts with two layers, one white and one yellow were uniaxially pressed at 80MPa and sintered at 1530°C-120min. The yellow-powder presented average particles size of 180±66nm, while the white-powder presented particles size of 198±73nm. After sintering, full dense ceramics with tetragonal phase were obtained. The linear shrinkage of the yellow and white-layer was 22.75% and 22.05% respectively. This difference in shrinkage is important in the machining of prostheses in ceramic CAD/CAM systems, because they lead to difficulties in adapting this customized prosthesis in patients.

Algorithms for Nesting of Ship/Offshore Structural Plates

1991 ◽  
Author(s):  
B. T. Cheok ◽  
A. Y. C. Nee
Keyword(s):  
Feature Extraction ◽  
Search Time ◽  
Computer Search ◽  
Rectangle Packing ◽  
Manual Method ◽  
Input And Output ◽  
Material Usage ◽  
Shape Processing ◽  
Cad Cam ◽  
Cam Systems

Abstract This paper discusses the development of a set of algorithms for the automatic nesting of ship/offshore structural plates. The algorithms are developed to take advantage of the peculiarity of most ship/offshore structural plates with the aims of optimising material usage and minimising computer search time. The parts to be nested are first processed by a shape processing routine which employs a simple feature extraction approach to classify the plates according to predefined rules specially adopted for ship/offshore structural shapes. The most appropriate search path for each class of plates is used to obtain the best enclosing rectangle for similar shapes. The search paths are based on heuristics developed to simulate the manual method used by the human operator. Finally, all the plates are laid out on the stock sheet using a “rectangle packing” approach. A computer package, Patnest-Ship was developed to demonstrate the efficiency of the algorithms and very encouraging results are achieved. The input and output files to and from Patnest-Ship are described in DXF format so that it can be integrated with existing CAD/CAM systems. Pre- and post-processors for this package have been implemented on AutoCAD to permit the user to define the plates and interactively improve on the solutions provided by Patnest-Ship, if necessary.

Knowledge Based Expert Systems for CAD/CAM Experience of an EDM Application

1993 ◽  
Author(s):  
D. Kiritsis ◽  
Michel Porchet ◽  
L. Boutzev ◽  
I. Zic ◽  
P. Sourdin
Keyword(s):  
Natural Language ◽  
System Development ◽  
Constraint Propagation ◽  
Programming Environment ◽  
Knowledge Based ◽  
Natural Language Programming ◽  
Cad Cam ◽  
The One ◽  
Rule System ◽  
Cam Systems

Abstract In this paper we present our experience from the use of two different expert system development environments to Wire-EDM CAD/CAM knowledge based application. The two systems used follow two different AI approaches: the one is based on the constraint propagation theory and provides a natural language oriented programming environment, while the other is a production rule system with backward-forward chaining mechanisms and a conventional-like programming style. Our experience showed that the natural language programming style offers an easier and more productive environment for knowledge based CAD/CAM systems development.

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