The Quality of Slicing Technologies for Digital Light Processing 3D Printing

2019 ◽  
Author(s):  
Tsz-Ho Kwok
Keyword(s):  
Process Planning ◽  
Computer Aided Design ◽  
Digital Light Processing ◽  
Manufacturing Method ◽  
Good Surface ◽  
Good Surface Finish ◽  
Computational Resources ◽  
Aided Design ◽  
Engineering Industries

Abstract The process planning of a manufacturing method is the key to ensure the quality of the fabricated part. In Additive Manufacturing (AM), slicing is a crucial step in process planning to convert a Computer-Aided Design (CAD) model to a machine-specific format. If the slicing results were incorrect, the manufacturing quality would have no way to be assured. Therefore, it is important to understand the performance of different slicing technologies for AM. Digital Light Processing (DLP) printing is an important AM process that has a good surface finish, high accuracy and fabrication speed, and is widely applied in many dental and engineering industries. However, while most other AM processes are toolpath-based, as a process that uses images as the fabrication tool, the DLP printing has its process planning understudied. Therefore, the main goal of this paper is to study, compare and benchmark the slicing technologies for DLP printing. Three slicing technologies are compared: contour, voxelization, and ray-tracing. They are tested with some common defects in slicing, and their usage in computational resources is also reported. The summary and suggestion are given at the end.

scholarly journals Comparing Slicing Technologies for Digital Light Processing Printing

2019 ◽  
Vol 19 (4) ◽  
Author(s):  
Tsz-Ho Kwok
Keyword(s):  
Process Planning ◽  
Computer Aided Design ◽  
High Accuracy ◽  
Cad Model ◽  
Digital Light Processing ◽  
Crucial Step ◽  
Good Surface ◽  
Good Surface Finish ◽  
Aided Design ◽  
Engineering Industries

In additive manufacturing (AM), slicing is a crucial step in process planning to convert a computer-aided design (CAD) model to a machine-specific format. Digital light processing (DLP) printing is an important AM process that has a good surface finish, high accuracy, and fabrication speed and is widely applied in many dental and engineering industries. However, as DLP uses images for fabrication different from other toolpath-based processes, its process planning is understudied. Therefore, the main goal of this paper is to study and compare the slicing technologies for DLP printing. Three slicing technologies are compared: contour, voxelization, and ray-tracing.

scholarly journals Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1401
Author(s):  
Doo-Bin Song ◽  
Man-So Han ◽  
Si-Chul Kim ◽  
Junyong Ahn ◽  
Yong-Woon Im ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Computer Aided Design ◽  
Dental Prostheses ◽  
Computer Aided ◽  
Cad Cam ◽  
Fixed Dental Prostheses ◽  
Gap Data ◽  
Aided Design ◽  
Fitting Accuracy

This study investigated the fitting accuracy of titanium alloy fixed dental prostheses (FDP) after sequential CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) fabrication. A three-unit FDP model connecting mandibular second premolars and molars was prepared and scanned to fabricate titanium FDPs by CAD/CAM milling. A total of six FDPs were sequentially milled in one titanium alloy disk using a new set of burs every time (n = 4). The fitting accuracy of FDPs was mesiodistally evaluated by a silicone replica technique and the measurement was triplicated at four different locations: MO (marginal opening), MG (marginal gap), AG (axial gap), and OG (occlusal gap). Data were statistically analyzed using ANOVA and Tukey’s HSD test. The fitting accuracy of PMMA (polymethyl methacrylate) FDPs milled using the worn or new bur were evaluated by the same procedure (n = 6). The mean dimensions of titanium FDP for all measuring positions, except for AG, were significantly increased from the third milling. However, no difference was noted between the first FDP and the second FDP milled with the same set of burs. Severe edge chippings were observed in all milling burs. Detrimental effects of the worn burs on the fitting accuracy were demonstrated in the CAD/CAM-milled PMMA FDP. The results recommend proper changing frequency of cutting burs to achieve the quality of fit and predictable outcomes for dental CAD/CAM prostheses.

Pathfinder Algorithm Modification for CPLD and FPGA Routing Stage

2021 ◽  
Vol 26 (5) ◽  
pp. 399-409
Author(s):  
M.A. Zapletina ◽  
◽  
S.V. Gavrilov ◽  
◽  
Keyword(s):  
Computer Aided Design ◽  
Digital Circuits ◽  
Routing Algorithm ◽  
Design Flow ◽  
Negative Effect ◽  
Industrial Projects ◽  
Placement And Routing ◽  
Aided Design ◽  
The Impact

One of the main advantages of FPGA and CPLD is the high development speed; therefore, the importance of effective computer-aided design tools for modern microcircuits of these classes cannot be overestimated. Placement and routing are the most time-consuming stages of FPGA/CPLD design flow. The quality of results of these stages is crucial to the final perfor-mance of custom digital circuits implemented on FPGA/CPLD. The paper discusses an approach to accelerating the routing stage within the layout synthesis flow for FPGA/CPLD by introducing a few algorithmic improvements to a routing procedure. The basic routing algorithm under study is a modified Pathfinder for a mixed routing resource graph. Pathfinder is a well-known negotiation-based routing algorithm that works on the principle of iteratively eliminating congestions of chip routing resources. For experiments, the sets of test digital circuits ISCAS'85, ISCAS'89, LGSynth'89 and several custom industrial projects were used. The impact of the proposed algorithmic improvements was analyzed using four FPGA/CPLD architectures. It has been established that due to the improvements of the algorithm proposed in the paper, the average reduction in routing time was from 1.3 to 2.6 times, depending on the FPGA/CPLD architecture, with no significant negative effect on the timing characteristics of the designed circuits.

An Investigation Report Ondigital Manufacturing of Orthoses

2013 ◽  
Vol 711 ◽  
pp. 689-694 ◽  
Author(s):  
Jian Hui Liu ◽  
Yan Wang ◽  
Zhi Jian Wang ◽  
Guo Ping Li
Keyword(s):  
Digital Technology ◽  
Computer Aided Design ◽  
Lead Time ◽  
State Of The Art ◽  
Digital Technologies ◽  
Digital Manufacturing ◽  
Manufacturing Method ◽  
Aided Design ◽  
Digital Manufacture ◽  
Investigation Report

Orthosesare important tools to help patients in rehabilitation andas well asfor theirself-care of disables in clinics. Traditionally, orthese are made manually, which is time consuming and error prone. Digital manufacturing of orthosescan significantly improve the efficiency and reduce lead time compared to tranditionalmethods.This paper attempts to conduct a review on theorthoses manufacturing method based on digital technology including Computer Aided Design (CAD), Comupter Aided Manufacture (CAM) and Reverse Engineering (RE) by examining state-of-the-art academic and industrial reserch.In this paper, the rationale behindthe development of orthoses manufacturing methodsbased on digital technologies isaddressed firstly, followed by adescription ofthecharateristicsofideal orthoses manufacturing methods. Next, some selectedresearchesindigitalorthoses manufacturing in terms of patents and academic papers isreviewedand evaluated against criteria foridealorthese manufacture. Finally thetrend of digital manufacture of ortheseisdiscussed and summarized.

Representing analogies to influence fixation and creativity: A study comparing computer-aided design, photographs, and sketches

2015 ◽  
Vol 29 (2) ◽  
pp. 161-171 ◽  
Author(s):  
Olufunmilola Atilola ◽  
Julie Linsey
Keyword(s):  
Computer Aided Design ◽  
Idea Generation ◽  
Generation Process ◽  
Critical Question ◽  
Design Fixation ◽  
Design Concepts ◽  
Computer Aided ◽  
Aided Design ◽  
Effective Design

AbstractMany tools are being developed to assist designers in retrieving analogies. One critical question these designers face is how these analogues should be represented in order to minimize design fixation and maximize idea generation. To address this question, an experiment is presented that compares various representations' influence on creativity and design fixation. This experiment presents an effective example (analogue) as computer-aided design (CAD), sketch, or photograph representations. We found that all representations induced fixation, and the degree of fixation did not vary significantly. We also found that CAD representations encourage engineering designers to identify and copy the key effective features of the example. CAD and photo representations also produced a higher quality of design concepts. Results from this experiment offer insights into how these various representations may be used in examples during idea generation; CAD representations appear to offer the greatest advantages during the idea generation process. The results from this experiment also indicate that analogical databases of effective design examples should include CAD and photolike images of the analogue rather than sketches.

CAD-Based Calculation of Cutting Force Components in Gear Hobbing

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Tapoglou Nikolaos ◽  
Antoniadis Aristomenis
Keyword(s):  
Cutting Forces ◽  
Computer Aided Design ◽  
Simulation Code ◽  
Gear Hobbing ◽  
Involute Gears ◽  
Cutting Force Components ◽  
Force Components ◽  
The Cost ◽  
Aided Design

Gear hobbing is a common method of manufacturing high precision involute gears. The thorough knowledge of the developed cutting forces and the wear of the cutting tool are of great importance in order to produce helical and spur gears as they influence the cost of the manufacturing process and the quality of the produced gear. A novel simulation code called HOB3D was created in accordance with the above. This code can simulate the complex movements involved in gear hobbing with the best available accuracy, which is achieved by embedding the developed algorithm in a commercial computer aided design (CAD) environment. The simulation code calculates and exports the total cutting forces as well as the cutting forces in every cutting edge involved in the cutting process.

scholarly journals Pushing the Design Envelope with CAE

1998 ◽  
Vol 120 (11) ◽  
pp. 66-71 ◽  
Author(s):  
Mar Halpern
Keyword(s):  
Computer Aided Design ◽  
Electronics Packaging ◽  
General Purpose ◽  
Element Analysis ◽  
Packaging Design ◽  
Computer Aided ◽  
Aided Design ◽  
Cae Simulation ◽  
Disc Drive

This article examines the growing usefulness of computer-aided engineering (CAE) programs for the design of electronics packaging. CAE combined with expert interpretation, can help manufacturers quickly satisfy demand for increasingly small yet reliable products. Currently, three classes of software specifically support electronics packaging design: integrated computer-aided design (CAD) CAE software, general-purpose CAE software, and specialty CAE software solutions. The integrated CAE software emphasizes automatic creation and updating of finite-element-analysis (FEA) models based on CAD geometry. The effectiveness of this associativity between CAD and FEA depends on the product behavior to be evaluated and the quality of implementation. CAE simulation can calculate the maximum acceptable loads on pins, as well as the vibration characteristics of components. Solids-based CAD helps detect interference problems across components, as in these exploded views of a disc drive and a headset. While several general-purpose CAE suppliers permit engineers to build customized environments for automating model creation, specialty suppliers such as Pacific Numerix deliver the specific automated capabilities and connector libraries.

scholarly journals AUTOMATION OF STRUCTURAL AND PARAMETRIC ANALYSIS OF PROJECT DECISIONS AND TRAINING OF THE DESIGNER OF MACHINE-BUILDING PRODUCTS WITH CAD COMPASS

2019 ◽  
Vol 2018 (2) ◽  
pp. 26-33
Author(s):  
Александр Афанасьев ◽  
Afanasyev Afanasyev ◽  
Сергей Бригаднов ◽  
Sergey Brigadnov
Keyword(s):  
Adaptive Learning ◽  
Computer Aided Design ◽  
Parametric Analysis ◽  
Three Dimensional ◽  
Machine Building ◽  
Building Products ◽  
Computer Aided ◽  
Design Solutions ◽  
Aided Design

The actual task in the field of computer-aided design of machine-building objects is to increase the level of automation of structural-parametric analysis of design solutions due to the repetition of their use, reducing the number of design operations and ensuring the corresponding competencies of designers. Developed methods and algorithms should ensure the acquisition of the necessary competencies for the designer for successful project activities in the field of computer-aided design, increasing the effectiveness of training. The system of analysis of design solutions should improve the quality of design solutions implemented in CAD KOMPAS-3D. In this paper, an overview of methods, systems and tools for analyzing design solutions implemented in the CAD-3D environment. The main features of such systems are described, their main disadvantages are identified: the lack of functions for determining non-optimal sequences of design operations, the inability to automatically rebuild a three-dimensional model of a machine-building product on the basis of analysis of the design model tree. A complex system for the analysis of project solutions and the training of a designer was developed and implemented, based on methods, models and algorithms for analysis and adaptive learning. The results of a computational experiment are presented, on the basis of which it can be concluded that the use of developed software enhances the efficiency and quality of the designer's training in the processes of constructing three-dimensional solid-state machine-building products in CAD KOMPAS-3D.

scholarly journals Comparison of Intaglio Surface Trueness of Interim Dental Crowns Fabricated with SLA 3D Printing, DLP 3D Printing, and Milling Technologies

Healthcare ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 983
Author(s):  
Keunbada Son ◽  
Jung-Ho Lee ◽  
Kyu-Bok Lee
Keyword(s):  
3D Printing ◽  
Computer Aided Design ◽  
Reference Model ◽  
Digital Light Processing ◽  
3 Dimensional ◽  
Dental Crowns ◽  
Test Models ◽  
Significant Difference ◽  
Manufacturing Accuracy ◽  
Aided Design

This study aimed to evaluate the intaglio surface trueness of interim dental crowns fabricated with three 3-dimensional (3D) printing and milling technologies. Dental crown was designated and assigned as a computer-aided design (CAD) reference model (CRM). Interim dental crowns were fabricated based on CRM using two types of 3D printer technologies (stereolithography apparatus and digital light processing) and one type of milling machine (n = 15 per technology). The fabricated interim dental crowns were obtained via 3D modeling of the intaglio surface using a laboratory scanner and designated as CAD test models (CTMs). The alignment and 3D comparison of CRM and CTM were performed based on the intaglio surface using a 3D inspection software program (Geomagic Control X). Statistical analysis was validated using one-way analysis of variance and Tukey HSD test (α = 0.05). There were significant differences in intaglio surface trueness between the three different fabrication technologies, and high trueness values were observed in the milling group (p < 0.05). In the milling group, there was a significant difference in trueness according to the location of the intaglio surface (p < 0.001). In the manufacturing process of interim dental crowns, 3D printing technologies showed superior and uniform manufacturing accuracy than milling technology.

scholarly journals Effect of Printing Layer Thickness on the Trueness and Margin Quality of 3D-Printed Interim Dental Crowns

2021 ◽  
Vol 11 (19) ◽  
pp. 9246
Author(s):  
Gülce Çakmak ◽  
Alfonso Rodriguez Cuellar ◽  
Mustafa Borga Donmez ◽  
Martin Schimmel ◽  
Samir Abou-Ayash ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Computer Aided Design ◽  
3D Analysis ◽  
Hybrid Resin ◽  
Dental Crowns ◽  
Alignment Tool ◽  
Occlusal Surfaces ◽  
3D Printed ◽  
Aided Design

The information in the literature on the effect of printing layer thickness on interim 3D-printed crowns is limited. In the present study, the effect of layer thickness on the trueness and margin quality of 3D-printed composite resin crowns was investigated and compared with milled crowns. The crowns were printed in 3 different layer thicknesses (20, 50, and 100 μm) by using a hybrid resin based on acrylic esters with inorganic microfillers or milled from polymethylmethacrylate (PMMA) discs and digitized with an intraoral scanner (test scans). The compare tool of the 3D analysis software was used to superimpose the test scans and the computer-aided design file by using the manual alignment tool and to virtually separate the surfaces. Deviations at different surfaces on crowns were calculated by using root mean square (RMS). Margin quality of crowns was examined under a stereomicroscope and graded. The data were evaluated with one-way ANOVA and Tukey HSD tests. The layer thickness affected the trueness and margin quality of 3D-printed interim crowns. Milled crowns had higher trueness on intaglio and intaglio occlusal surfaces than 100 μm-layer thickness crowns. Milled crowns had the highest margin quality, while 20 μm and 100 μm layer thickness printed crowns had the lowest. The quality varied depending on the location of the margin.

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