Print Parameters Influence on Parts' Quality and Calibration with 3DP-Part II: Print Parameters Calibration and Contour Accuracy Control

2011 ◽  
Vol 399-401 ◽  
pp. 1687-1692 ◽  
Author(s):  
Shu Juan Li ◽  
Shan Cao
Keyword(s):  
Experimental Method ◽  
Layer Thickness ◽  
Error Compensation ◽  
Powder Layer ◽  
Contour Error ◽  
Accuracy Control ◽  
Contour Accuracy ◽  
Binder Saturation ◽  
Printing Parameters

In 3DP process, part has a large contour error due to the print machine, printing parameters, the characters of part materials and other factors. In this paper, based on the result from the Part I, the experimental method is used to study on the part contour error by placing 56 cubes in the manufacturing box in 3DP process. When the binder saturation level and the powder layer thickness are fixed, the contour error for cubes in X, Y and Z directions is obtained, and the leaking error compensation value, also means bleed compensation for the binder in different directions are achieved, and bleed compensation is used to calibrate the printer parameters. The case study also verifies the result in 3DP process, which is effectiveness in parts’ contour error compensation.

The Method of Fillet Contour Error Compensation Applied in End Cylindrical Crankshaft Grinder

2014 ◽  
Vol 556-562 ◽  
pp. 1165-1169 ◽  
Author(s):  
Min Luo ◽  
Ling Yun Chen ◽  
Zhi Chu Chen
Keyword(s):  
Satisfactory Result ◽  
Error Compensation ◽  
Contour Error ◽  
Shape Error ◽  
Practical Application ◽  
Circular Arc ◽  
Diamond Disk ◽  
Front End ◽  
Circular Arcs ◽  
Contour Accuracy

The Contour accuracy of a crankshaft transition fillet is important for the crankshaft working reliability. The front end surface, cylindrical surface and the transition fillet of a crankshaft are grinded by an end cylindrical grinder. During this machining, due to the roller’s shape error and other factors, the contour error of the fillet cannot be guaranteed while 90 degree circular arc interpolation was taken. In this paper, a fillet contour error compensation model was established, the appropriate compensation macro program was designed, and the radical contour error compensation was implemented through 9 circular arcs approaching. The practical application is shown that the satisfactory result is achieved and this method can also be applied in the fillet compensation for wheel dressing when applying diamond disk or stylus.

Print Parameters Influence on Parts' Quality and Calibration with 3DP-Part I: Print Parameters Influence on Parts’ Surface Topography

2011 ◽  
Vol 399-401 ◽  
pp. 1639-1645 ◽  
Author(s):  
Shu Juan Li ◽  
Shan Cao
Keyword(s):  
Surface Topography ◽  
Layer Thickness ◽  
Three Dimensional ◽  
Saturation Level ◽  
Powder Layer ◽  
Free Form ◽  
High Productivity ◽  
Experiment Platform ◽  
Part Surface ◽  
Binder Saturation

As an important Solid Free Form Fabrication (SFF) technology, three-dimensional printing (3DP) has become popular in applications due to its properties of rapid prototyping, no pollution, and high productivity. Based on the experiment platform of ZP310, this paper investigates that powder layer thickness and blinder saturation level for different location of parts placement have effect on the part surface topography and forming accuracy, the location of parts placement includes right, middle and left, respectively, which represents the different face contact to the bottom of manufacturing box. The experiments show that: when the left of part is placed to contact to the bottom of manufacturing box, the powder layer thickness is 0.1 mm and the binder saturation level is 70%, the best surface topography can be obtained.

The role of powder layer thickness on the quality of SLM printed parts

2018 ◽  
Vol 18 (3) ◽  
pp. 948-955 ◽  
Author(s):  
Q.B. Nguyen ◽  
D.N. Luu ◽  
S.M.L. Nai ◽  
Z. Zhu ◽  
Z. Chen ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Powder Layer

scholarly journals Process Parameter Optimization in Fused Deposition Modeling (FDM) Using Response Surface Methodology (RSM)

2020 ◽  
Author(s):  
Muhammad Salman Mustafa ◽  
Muhammad Qasim Zafar ◽  
Muhammad Arslan Muneer ◽  
Muhammad Arif ◽  
Farrukh Arsalan Siddiqui ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Response Surface Methodology ◽  
Impact Strength ◽  
Response Surface ◽  
Layer Thickness ◽  
Fused Deposition Modeling ◽  
Experimental Results ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Printing Parameters

Abstract Fused Deposition Modeling (FDM) is a widely adopted additive manufacturing process to produce complex 3D structures and it is typically used in the fabrication of biodegradable materials e.g. PLA/PHA for biomedical applications. However, FDM as a fabrication process for such material needs to be optimized to enhance mechanical properties. In this study, dogbone and notched samples are printed with the FDM process to determine optimum values of printing parameters for superior mechanical properties. The effect of layer thickness, infill density, and print bed temperature on mechanical properties is investigated by applying response surface methodology (RSM). Optimum printing parameters are identified for tensile and impact strength and an empirical relation has been formulated with response surface methodology (RSM). Furthermore, the analysis of variance (ANOVA) was performed on the experimental results to determine the influence of the process parameters and their interactions. ANOVA results demonstrate that 44.7% infill density, 0.44 mm layer thickness, and 20C° printing temperatures are the optimum values of printing parameters owing to improved tensile and impact strength respectively. The experimental results were found in strong agreement with the predicted theoretical results.

Embodying Meaning Visually: From Perceptual Dynamics to Motion Kinematics

2022 ◽  
pp. 1-22
Author(s):  
Maarten Coëgnarts ◽  
Mario Slugan
Keyword(s):  
Experimental Method ◽  
Experimental Work ◽  
Cognitive Perspective ◽  
Story Content ◽  
Structure Abstract ◽  
Stationary Frame ◽  
Dynamic Patterns ◽  
High Level ◽  
Shed Light

Abstract This paper adopts an embodied cognitive perspective to review the significance of dynamic patterns in the visual expression of meaning. Drawing upon the work of Rudolf Arnheim we first show how perceptual dynamics of inanimate objects might be extended in order to structure abstract meaning in fixed images such as paintings. Second, we evaluate existing experimental work that shows how simple kinematic structures within a stationary frame might embody such high-level properties as perceptual causality and animacy. Third and last, we take inspiration from these experiments to shed light on the expressiveness of dynamic patterns that unfold once the frame itself becomes a mobile entity (i.e., camera movement). In the latter case we will also present a filmic case study, showing how filmmakers might resort to these dynamic patterns so as to embody a film’s story content, while simultaneously offering a further avenue for film scholars to deepen their engagement with the experimental method.

scholarly journals Optimization of the 3D Printing Parameters for Tensile Properties of Specimens Produced by Fused Filament Fabrication of 17-4PH Stainless Steel

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 774 ◽  
Author(s):  
Damir Godec ◽  
Santiago Cano ◽  
Clemens Holzer ◽  
Joamin Gonzalez-Gutierrez
Keyword(s):  
Stainless Steel ◽  
3D Printing ◽  
Tensile Properties ◽  
Layer Thickness ◽  
Flow Rate ◽  
Three Dimensional ◽  
Steel Powder ◽  
Extrusion Temperature ◽  
Fused Filament Fabrication ◽  
Printing Parameters

Fused filament fabrication (FFF) combined with debinding and sintering could be an economical process for three-dimensional (3D) printing of metal parts. In this paper, compounding, filament making, and FFF processing of feedstock material with 55% vol. of 17-4PH stainless steel powder in a multicomponent binder system are presented. The experimental part of the paper encompasses central composite design for optimization of the most significant 3D printing parameters (extrusion temperature, flow rate multiplier, and layer thickness) to obtain maximum tensile strength of the 3D-printed specimens. Here, only green specimens were examined in order to be able to determine the optimal parameters for 3D printing. The results show that the factor with the biggest influence on the tensile properties was flow rate multiplier, followed by the layer thickness and finally the extrusion temperature. Maximizing all three parameters led to the highest tensile properties of the green parts.

Camera signal dependencies within coaxial melt pool monitoring in laser powder bed fusion

2020 ◽  
Vol 26 (1) ◽  
pp. 100-106 ◽  
Author(s):  
Tobias Kolb ◽  
Reza Elahi ◽  
Jan Seeger ◽  
Mathews Soris ◽  
Christian Scheitler ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Layer Thickness ◽  
Powder Layer ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Sensory Signals ◽  
Melt Pool ◽  
Research Activities

Purpose The purpose of this paper is to analyse the signal dependency of the camera-based coaxial monitoring system QMMeltpool 3D (Concept Laser GmbH, Lichtenfels, Germany) for laser powder bed fusion (LPBF) under the variation of process parameters, position, direction and layer thickness to determine the capability of the system. Because such and similar monitoring systems are designed and presented for quality assurance in series production, it is important to present the dominant signal influences and limitations. Design/methodology/approach Hardware of the commercially available coaxial monitoring QMMeltpool 3D is used to investigate the thermal emission of the interaction zone during LPBF. The raw images of the camera are analysed by means of image processing to bypass the software of QMMeltpool 3D and to gain a high level of signal understanding. Laser power, scan speed, laser spot diameter and powder layer thickness were varied for single-melt tracks to determine the influence of a parameter variation on the measured sensory signals. The effects of the scan direction and position were also analysed in detail. The influence of surface roughness on the detected sensory signals was simulated by a machined substrate plate. Findings Parameter variations are confirmed to be detectable. Because of strong directional and positional dependencies of the melt-pool monitoring signal a calibration algorithm is necessary. A decreasing signal is detected for increasing layer thickness. Surface roughness is identified as a dominating factor with major influence on the melt-pool monitoring signal exceeding other process flaws. Research limitations/implications This work was performed with the hardware of a commercially available QMMeltpool 3D system of an LPBF machine M2 of the company Concept Laser GmbH. The results are relevant for all melt-pool monitoring research activities connected to LPBF, as well as for end users and serial production. Originality/value Surface roughness has not yet been revealed as being one of the most important origins for signal deviations in coaxial melt-pool monitoring. To the best of the authors’ knowledge, the direct comparison of influences because of parameters and environment has not been published to this extent. The detection, evaluation and remelting of surface roughness constitute a plausible workflow for closed-loop control in LPBF.

Rejecting rejections—seeking acceptance of experimental economics in economics journals

2020 ◽  
Vol 72 (4) ◽  
pp. 946-965 ◽  
Author(s):  
By Andrej Svorenčík
Keyword(s):  
Small Group ◽  
Experimental Economics ◽  
Experimental Method ◽  
Central Question ◽  
Direct Experience ◽  
Economic Experiments ◽  
Journal Editors ◽  
Economics Journals ◽  
Economics Research

Abstract This paper addresses a central question of the experimental turn in economics: how a relatively small group of experimental economists in the 1970s and 1980s managed to convince editors and referees of leading economics journals of the merits of the experimental method. The consequence of this was that, by the early 1990s, experimental economics research became a standard feature of economics journals and of the economics mainstream. I draw on a unique—and, to this date, never utilized—corpus of referee reports (and related correspondence) by Charles Plott, one of the leading pioneers of experimental economics. His publication corpus is used as a case study of how experimental economists sought acceptance in economics journals. I describe a set of nine strategies that he and other early experimental economists used to convince journal editors and referees who had no direct experience with conducting economic experiments of the merits of the experimental method.

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