scholarly journals 3D‐printing of highly translucent ORMOCER ®‐based resin using light absorber for high dimensional accuracy

2020 ◽  
Vol 138 (3) ◽  
pp. 49691 ◽  
Author(s):  
Carina Kolb ◽  
Nils Lindemann ◽  
Herbert Wolter ◽  
Gerhard Sextl
Keyword(s):  
3D Printing ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Light Absorber

scholarly journals Using of Polymers for Rapid Prototyping of an Axial Microturbine Runner and Wicked Gates

2019 ◽  
Vol 56 (2) ◽  
pp. 454-459
Author(s):  
Dorian Nedelcu ◽  
Vasile Cojocaru ◽  
Lavinia Madalina Micu ◽  
Danut Florea ◽  
Mihai Hluscu
Keyword(s):  
High Resolution ◽  
3D Printing ◽  
Rapid Prototyping ◽  
Complex Geometry ◽  
Dimensional Accuracy ◽  
Hydraulic Turbine ◽  
High Dimensional ◽  
Fabrication Cost ◽  
Turbine Runner ◽  
Manufacturing Technologies

Hydraulic turbine components that define the water flow, generally have a complex geometry. In the design of these components a major role is played by model tests. The complex geometry of runner�s blades and wicked gates determines high manufacturing times and high fabrication cost if they are made by classical manufacturing technologies (casting, machining on numerically controlled machines). The use of high resolution 3D printing reduces the production time, simplifies the manufacturing technology and generate high dimensional accuracy. The paper presents the design and the manufacturing process of the components from a new solution of axial hydroturbine, equipped with a permanent magnet generator and an immersed runner. The manufacturing of the main parts of the turbine (runner and wicked gates) it was made by Rapid Prototyping.

Results of studying the dimensional accuracy of the bases of complete removable prostheses made using 3D printing and traditional technologies

2020 ◽  
pp. 34-39
Author(s):  
Vokulova Yu.A. Vokulova ◽  
E.N. Zhulev
Keyword(s):  
3D Printing ◽  
Traditional Method ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Significance Level ◽  
Average Value ◽  
The Difference

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

scholarly journals Metal Machining—Recent Advances, Applications, and Challenges

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 580
Author(s):  
Francisco J. G. Silva
Keyword(s):  
Surface Finish ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
High Dimensional ◽  
Manufacturing Processes ◽  
Recent Advances ◽  
Metal Machining ◽  
Rapid Manufacture

Though new manufacturing processes that revolutionize the landscape regarding the rapid manufacture of parts have recently emerged, the machining process remains alive and up-to-date in this context, always presenting itself as a manufacturing process with several variants and allowing for high dimensional accuracy and high levels of surface finish [...]

Miniaturized Embossed Low Resistance Fine Line Coils in LTCC

2009 ◽  
Vol 6 (1) ◽  
pp. 42-48 ◽  
Author(s):  
R. Perrone ◽  
H. Bartsch de Torres ◽  
M. Hoffmann ◽  
M. Mach ◽  
J. Müller
Keyword(s):  
Thick Film ◽  
Cross Section ◽  
Screen Printing ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Stencil Printing ◽  
Fine Line ◽  
Low Resistance ◽  
Whole Process ◽  
Line Widths

Embedded ceramic coils stand out because of their excellent dielectric, thermal, and RF properties. However the relatively high sheet resistance (low thickness) of printed thick-film conductors restricts their functionality for applications where current values of several amps are needed. Using embossed structures it is possible to manufacture conductors with increased thickness and low resistance on LTCC tapes. The manufacturing process for wide conductors with high dimensional accuracy was shown in previous publications. In this work fine line embossed structures with line widths and spaces of 50 and 75 μm respectively were realized. The cross section of the embossed channels was about 50 μm. The fine line screen printing, stencil printing, and the photo definable Fodel® processes were used to fill the small structures with thick-film ink. The whole process was used to manufacture several types of low resistance coils in LTCC that can be used for current values up to approximately 3 A. They were realized as embedded as well as SMD components. Thus, the functionality of LTCC modules and LTCC SMD coils was increased. In this paper, the filling and patterning characteristics of all structuring methods are compared and the results discussed. Furthermore, the advantages of this process are shown by electrical, thermal, and RF measurements.

Novel High-Precision Pitch Artifact Using Balls

2008 ◽  
Vol 381-382 ◽  
pp. 95-96 ◽  
Author(s):  
Masaharu Komori ◽  
Sonko Osawa ◽  
Osamu Sato ◽  
T. Kiten ◽  
D. Shirasaki ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
High Precision ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Measuring Instruments ◽  
Order Accuracy ◽  
Special Process

In this research, a novel high-precision pitch artifact using balls is proposed for calibration of pitch measuring instruments. This pitch artifact is composed of the combination and the alignment of balls and cylinders on a plane. Balls, cylinders and planes are possible to be manufactured with several-ten-nanometer-order accuracy. Therefore, this artifact can accomplish high dimensional accuracy. In addition, manufacturing of this artifact is not difficult because time-consuming special process is not needed. In this report, the concept, structure and feature of this pitch artifact are proposed and theoretical analysis is carried out.

Process Analysis and Numerical Simulation of UHMW-PE Pipe Gas-Assisted Precision Molding

2011 ◽  
Vol 221 ◽  
pp. 264-270
Author(s):  
Feng Hua Tong ◽  
Jian Hua Qin
Keyword(s):  
Theoretical Basis ◽  
Process Analysis ◽  
New Technology ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Screw Extruder ◽  
Excellent Performance ◽  
Single Screw ◽  
Single Screw Extruder ◽  
Temperature Time

The method of molding in barrel is a new technology of extruding pure UHMW-PE pipes continuously on single screw extruder. Its significant advantage is that the pure UHMW-PE tube is extruded continuously and efficiently without any additives. In order to get UHMW-PE pipe with smooth surface, high dimensional accuracy and excellent performance, the tube should be molded precisely by the gas-assisted device. This paper will analyze the principle of UHMW-PE pipe gas-assisted precision molding and simulate the process. The analytical results such as temperature, time and internal stress distribution provide a theoretical basis for the design of the gas-assisted precision molding device.

scholarly journals Dimensional Accuracy of Parts Manufactured by 3D Printing for Interaction in Virtual Reality

2017 ◽  
Vol 11 (4) ◽  
pp. 279-285 ◽  
Author(s):  
Radosław Wichniarek ◽  
Filip Górski ◽  
Wiesław Kuczko ◽  
Przemysław Zawadzki ◽  
Paweł Buń
Keyword(s):  
Virtual Reality ◽  
3D Printing ◽  
Dimensional Accuracy

Dimensional Accuracy in PolyJet Printing: A Literature Review

2019 ◽  
Author(s):  
Ketan Thakare ◽  
Xingjian Wei ◽  
Zhijian Pei
Keyword(s):  
Additive Manufacturing ◽  
Layer Thickness ◽  
Surface Finish ◽  
Dimensional Accuracy ◽  
High Dimensional ◽  
Control Variables ◽  
Current Trends ◽  
Manufacturing Methods ◽  
Polyjet Printing ◽  
Part Orientation

Abstract PolyJet printing process is one of the additive manufacturing methods to print parts with high dimensional accuracy. To date, dimensional accuracies of such process have been investigated by a number of studies. This review will summarize those studies, and identify current trends. With respect to methods of measurements used in the reported studies, it is noted that no special preference is given to use of any method. In addition, the effects of four control variables of PolyJet process: part orientation, layer thickness, surface finish type and materials, on dimensional accuracy are noted based on the results of reported studies. There is consistency in results in studies considering control variables of layer thickness, surface finish type and materials. However, the results are inconsistent in studies considering part orientation.

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