Influence of Technological Parametrs on the Dimension of Threaded Parts Generated with PLA Matherial by FDM 3D Printing

2018 ◽  
Vol 55 (4) ◽  
pp. 718-722
Author(s):  
Mircea Dorin Vasilescu ◽  
Traian Fleser
Keyword(s):  
Computer Simulation ◽  
3D Printing ◽  
Energy Resource ◽  
Resource Consumption ◽  
Point Of View ◽  
Functional Characteristics ◽  
3D Printed

In this research are establish the technology of 3D printable parts by the principle of FDM 3D printed for threaded made by PLA, ABS, Nylon or PETG. In the paper are present first the dimensional generation and specific aspects that need to be considered to produce threaded with internal teeth of the metric, round or trapezoidal type. Generating the threaded appeared as a necessity for the reconditioning or made of the components of the processing machines made both in the process of elaboration of the bachelor�s and the laboratory works, with reduced energy resource consumption and low pollution as low as possible. After the construction, it is identify the dimension that have implications for both mechanical and kinematic resistance to make a product with good cinematic and functional characteristics. After that are made an analysis of the layers generated, both from the computer simulation and from the point of view of the analysis of layers physically generated for a threaded with internal teeth. At the end are presented which are necessary for operations to obtain a product with good features starting from two types of thread generated 8x2 and 10x2 moments.

scholarly journals Influence of Technological Parameters on the Dimension of GEAR Parts Generated with PLA Matherial by FDM 3D Printing

2018 ◽  
Vol 55 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Mircea Dorin Vasilescu ◽  
Traian Fleser
Keyword(s):  
Computer Simulation ◽  
3D Printing ◽  
Gear Tooth ◽  
Energy Resource ◽  
Electric Machines ◽  
Resource Consumption ◽  
Point Of View ◽  
Technological Parameters ◽  
Functional Characteristics

The purpose of this research is to establish the technology of 3D printable production on the principle of FDM of gears made of PLA, ABS and PETG mainly. In the paper we present first the dimensional generation and specific aspects that need to be considered to produce gears with internal or external teeth of the cylindrical type with vertical or inclined teeth. Generating the gears appeared as a necessity for the reconditioning of the components of the processing machines and of the electric machines made both in the process of elaboration of the bachelor�s and the laboratory works, with reduced energy resource consumption and low pollution as low as possible. After the construction, we past to identify the dimension that have implications for both mechanical and kinematic resistance to achieve a product with good cinematic and functional characteristics. After that are made an analysis of the layers generated, both from the computer simulation and from the point of view of the analysis of layers physically generated on a gear tooth with external teeth.

scholarly journals Evaluation of the Ability to Accurately Produce Angular Details by 3D Printing of Plastic Parts

Machines ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 150
Author(s):  
Andrei Marius Mihalache ◽  
Gheorghe Nagîț ◽  
Laurențiu Slătineanu ◽  
Adelina Hrițuc ◽  
Angelos Markopoulos ◽  
...  
Keyword(s):  
3D Printing ◽  
Point Of View ◽  
Vertex Angle ◽  
Function Type ◽  
Constant Height ◽  
3D Printers ◽  
3D Printed ◽  
Mathematical Processing ◽  
Plastic Parts

3D printing is a process that has become widely used in recent years, allowing the production of parts with relatively complicated shapes from metallic and non-metallic materials. In some cases, it is challenging to evaluate the ability of 3D printers to make fine details of parts. For such an assessment, the printing of samples showing intersections of surfaces with low angle values was considered. An experimental plan was designed and materialized to highlight the influence of different factors, such as the thickness of the deposited material layer, the printing speed, the cooling and filling conditions of the 3D-printed part, and the thickness of the sample. Samples using areas in the form of isosceles triangles with constant height or bases with the same length, respectively, were used. The mathematical processing of the experimental results allowed the determination of empirical mathematical models of the power-function type. It allowed the detection of both the direction of actions and the intensity of the influence exerted by the input factors. It is concluded that the strongest influence on the printer’s ability to produce fine detail, from the point of view addressed in the paper, is exerted by the vertex angle, whose reduction leads to a decrease in printing accuracy.

scholarly journals Fresh and Hardened Properties of Extrusion-Based 3D-Printed Cementitious Materials: A Review

2020 ◽  
Vol 12 (14) ◽  
pp. 5628
Author(s):  
Zhanzhao Li ◽  
Maryam Hojati ◽  
Zhengyu Wu ◽  
Jonathon Piasente ◽  
Negar Ashrafi ◽  
...  
Keyword(s):  
3D Printing ◽  
Experimental Testing ◽  
Design Procedure ◽  
Cementitious Materials ◽  
Material Point ◽  
Point Of View ◽  
Open Time ◽  
Potential Benefits ◽  
3D Printed ◽  
Hardened Properties

3D-printing of cementitious materials is an innovative construction approach with which building elements can be constructed without the use of formwork. Despite potential benefits in the construction industry, it introduces various engineering challenges from the material point of view. This paper reviews the properties of extrusion-based 3D-printed cementitious materials in both fresh and hardened states. Four main properties of fresh-state printing materials are addressed: flowability, extrudability, buildability, and open time, along with hardened properties, including density, compressive strength, flexural strength, tensile bond strength, shrinkage, and cracking. Experimental testing and effective factors of each property are covered, and a mix design procedure is proposed. The main objective of this paper is to provide an overview of the recent development in 3D-printing of cementitious materials and to identify the research gaps that need further investigation.

scholarly journals The Use of 3D-Printing Technology in Calculus Education: Concept Formation Processes of the Concept of Derivative with Printed Graphs of Functions

2020 ◽  
Vol 6 (3) ◽  
pp. 320-339
Author(s):  
Frederik Dilling ◽  
Ingo Witzke
Keyword(s):  
3D Printing ◽  
Concept Formation ◽  
Teaching And Learning ◽  
Qualitative Content Analysis ◽  
Research Question ◽  
Point Of View ◽  
Formation Processes ◽  
Printing Technology ◽  
3D Printing Technology ◽  
3D Printed

Abstract 3D-printing technology has become increasingly important in recent years, offering many possibilities for mathematics teaching and learning. From our point of view, the field of calculus seems to be particularly suitable for the use of 3D-printing. Using the example of 3D-printed graphs of functions, the use of this technology in calculus is discussed within the three approaches of Grundvorstellungen, Subjective Domains of Experience and Empirical Theories. An empirical study, based on the qualitative content analysis according to Philipp Mayring, examines the influence of the models on concept formation processes in the context of derivatives. The focus is on the following research question: “What are the characteristics of concept formation processes of the concept of derivative in the context of 3D-printed graphs of functions?”

scholarly journals On the technological and dimensional considerations for generating parts by 3D-printed with light processing focus

2019 ◽  
Vol XXII (1) ◽  
pp. 289-296
Author(s):  
Vasilescu M. D.
Keyword(s):  
3D Printing ◽  
Optical Microscope ◽  
Point Of View ◽  
Surface Generation ◽  
Digital Light Processing ◽  
Printing Process ◽  
Flat Surfaces ◽  
3D Printed ◽  
The One ◽  
The Cost

The paper takes into account the specific process of generation and parameters setting of 3D printing process DLP (Digital Light Processing) which have an influence on the characteristics of planar surface of the parts. In the first part of the paper the study is conduct to determinate the parameters which can influence the process of implementation of flat surfaces pieces with 3D DLP process printing. In this part there is and a comparison with the method of generating the marker method 3D printing FDM (Fuse Deposit Modelling). It has chosen this solution because on the one hand the cost of parts are medium, as well as generating principle is relatively simple in terms of technological point of view, but as well as the accuracy and quality of surface generation made with this printing is much better than that provided by the process of asking for a comparison is made. Analysis of the surface will be done so about using an optical microscope with a magnification of 0-500 times, and by means of an electronic measure for dimensional parts as well as for spatial areas of the deviations generated. In it also make references to the methodology of generating flat surfaces and to influence the way their generation characteristics of the parts generated by the 3D printing process type DLP. It should be pointed out that from the perspective of the characteristics of the surfaces generated in literature there are few references in this direction being those areas indicated in the area, as well as acting, although the products have engineering applications.

When 3D Printing Meets Tribological Demands - Surface Functionalization Technologies as Added Value of Existing and New Emerging Products

2021 ◽  
Vol 1016 ◽  
pp. 1103-1108
Author(s):  
Ileana Panaitescu ◽  
Manel Rodríguez Ripoll ◽  
Christian Katsich ◽  
Reinhard Hubmann ◽  
Ewald Badisch
Keyword(s):  
Wear Resistance ◽  
3D Printing ◽  
Surface Functionalization ◽  
Metallic Matrix ◽  
Point Of View ◽  
Added Value ◽  
Friction Behavior ◽  
Surface Functionality ◽  
Production Technologies ◽  
3D Printed

3D printed parts and components operate under specific conditions in demanding applications thus requiring additional surface functionality. From the tribological point of view, as-printed surfaces need to enhance their wear resistance or be able to control friction when sliding against other components. The overall focus is to develop a smart approach for functional component optimization through tribo-technical / technological optimization. In this work, the development of a hybrid 3D-printing process was realized by: (i) a combination of production technologies (hybridization), and (ii) customized surfaces by laser processing (functionalization). The focus is set on the increase in the wear resistance by the presence of hard and wear resistant particles embedded in a metallic matrix. For controlled friction behavior self-lubricating layers were deposited on the surfaces.

Biodegradable 3D Printed Polymer Microneedles for Transdermal Drug Delivery

2018 ◽  
Author(s):  
Michael A. Luzuriaga ◽  
Danielle R. Berry ◽  
John C. Reagan ◽  
Ronald A. Smaldone ◽  
Jeremiah J. Gassensmith
Keyword(s):  
Drug Delivery ◽  
3D Printing ◽  
Transdermal Drug Delivery ◽  
Fused Deposition Modeling ◽  
Fused Deposition ◽  
Modeling Software ◽  
Deposition Modeling ◽  
3D Printed ◽  
Microfabrication Technique ◽  
Mechanical Strengths

Biodegradable polymer microneedle (MN) arrays are an emerging class of transdermal drug delivery devices that promise a painless and sanitary alternative to syringes; however, prototyping bespoke needle architectures is expensive and requires production of new master templates. Here, we present a new microfabrication technique for MNs using fused deposition modeling (FDM) 3D printing using polylactic acid, an FDA approved, renewable, biodegradable, thermoplastic material. We show how this natural degradability can be exploited to overcome a key challenge of FDM 3D printing, in particular the low resolution of these printers. We improved the feature size of the printed parts significantly by developing a post fabrication chemical etching protocol, which allowed us to access tip sizes as small as 1 μm. With 3D modeling software, various MN shapes were designed and printed rapidly with custom needle density, length, and shape. Scanning electron microscopy confirmed that our method resulted in needle tip sizes in the range of 1 – 55 µm, which could successfully penetrate and break off into porcine skin. We have also shown that these MNs have comparable mechanical strengths to currently fabricated MNs and we further demonstrated how the swellability of PLA can be exploited to load small molecule drugs and how its degradability in skin can release those small molecules over time.

Biomimetic Design of 3D Printed Tissue-engineered bone Constructs

2020 ◽  
Vol 16 ◽  
Author(s):  
Wei Liu ◽  
Shifeng Liu ◽  
Yunzhe Li ◽  
Peng Zhou ◽  
Qian ma
Keyword(s):  
Tissue Engineering ◽  
3D Printing ◽  
Advanced Materials ◽  
Bionic Design ◽  
Material Interfaces ◽  
Precise Control ◽  
Cell Printing ◽  
Biomimetic Scaffolds ◽  
3D Printed

Abstract:: Surgery to repair damaged tissue, which is caused by disease or trauma, is being carried out all the time, and a desirable treatment is compelling need to regenerate damaged tissues to further improve the quality of human health. Therefore, more and more research focus on exploring the most suitable bionic design to enrich available treatment methods. 3D-printing, as an advanced materials processing approach, holds promising potential to create prototypes with complex constructs that could reproduce primitive tissues and organs as much as possible or provide appropriate cell-material interfaces. In a sense, 3D printing promises to bridge between tissue engineering and bionic design, which can provide an unprecedented personalized recapitulation with biomimetic function under the precise control of the composition and spatial distribution of cells and biomaterials. This article describes recent progress in 3D bionic design and the potential application prospect of 3D printing regenerative medicine including 3D printing biomimetic scaffolds and 3D cell printing in tissue engineering.

scholarly journals Design of a 3D-printed hand prosthesis featuring articulated bio-inspired fingers

2020 ◽  
pp. 095441192098088
Author(s):  
Juan Sebastian Cuellar ◽  
Dick Plettenburg ◽  
Amir A Zadpoor ◽  
Paul Breedveld ◽  
Gerwin Smit
Keyword(s):  
3D Printing ◽  
Design Principles ◽  
Prosthetic Hand ◽  
Hand Prosthesis ◽  
Fused Deposition ◽  
Pinch Force ◽  
Actuation System ◽  
3D Printed ◽  
Energy Dissipated ◽  
Dual Material

Various upper-limb prostheses have been designed for 3D printing but only a few of them are based on bio-inspired design principles and many anatomical details are not typically incorporated even though 3D printing offers advantages that facilitate the application of such design principles. We therefore aimed to apply a bio-inspired approach to the design and fabrication of articulated fingers for a new type of 3D printed hand prosthesis that is body-powered and complies with basic user requirements. We first studied the biological structure of human fingers and their movement control mechanisms in order to devise the transmission and actuation system. A number of working principles were established and various simplifications were made to fabricate the hand prosthesis using a fused deposition modelling (FDM) 3D printer with dual material extrusion. We then evaluated the mechanical performance of the prosthetic device by measuring its ability to exert pinch forces and the energy dissipated during each operational cycle. We fabricated our prototypes using three polymeric materials including PLA, TPU, and Nylon. The total weight of the prosthesis was 92 g with a total material cost of 12 US dollars. The energy dissipated during each cycle was 0.380 Nm with a pinch force of ≈16 N corresponding to an input force of 100 N. The hand is actuated by a conventional pulling cable used in BP prostheses. It is connected to a shoulder strap at one end and to the coupling of the whiffle tree mechanism at the other end. The whiffle tree mechanism distributes the force to the four tendons, which bend all fingers simultaneously when pulled. The design described in this manuscript demonstrates several bio-inspired design features and is capable of performing different grasping patterns due to the adaptive grasping provided by the articulated fingers. The pinch force obtained is superior to other fully 3D printed body-powered hand prostheses, but still below that of conventional body powered hand prostheses. We present a 3D printed bio-inspired prosthetic hand that is body-powered and includes all of the following characteristics: adaptive grasping, articulated fingers, and minimized post-printing assembly. Additionally, the low cost and low weight make this prosthetic hand a worthy option mainly in locations where state-of-the-art prosthetic workshops are absent.

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