Analysis of Screw Extrusion of Thermoplastics for AM

2021 ◽  
Author(s):  
Yash Gopal Mittal ◽  
Shivam Prajapati ◽  
Pushkar Kamble ◽  
Dmitriy Trushnikov ◽  
Alain Bernard ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Computer Aided Design ◽  
Polymer Melt ◽  
Deposition Process ◽  
Power Requirement ◽  
Melt Temperature ◽  
Single Screw Extrusion ◽  
Screw Extrusion ◽  
Torque Capacity

Abstract 3D printing is an Additive Manufacturing (AM) process that enables physical realization of a CAD (Computer-Aided Design) model. 3D printing can be classified into several variants; Material Extrusion Additive Manufacturing (MEAM) is the most versatile and widely used. MEAM is a continuous extrusion and selective deposition process commonly used for thermoplastics. Screw Extrusion Additive Manufacturing (SEAM), a sub-domain of MEAM, uses an extruder screw to push the polymer-melt out of the nozzle. Computational Fluid Dynamics (CFD) analysis of a single screw extrusion of thermoplastics is presented in this paper. The effect of various control parameters like screw rotation, wall heat flux/temperature profile, screw geometry, etc., has been studied on the required output parameters like productivity, torque capacity, power requirement, metering efficiency, etc. It is found that the incrementally-variable-pitch screw geometry provides the best metering characteristics. However, every screw design is a compromise between melt temperature, productivity, and power requirements.

scholarly journals ADDITIVE MANUFACTURING - APPLICATION OPPORTUNITIES FOR THE AVIATION INDUSTRY

2015 ◽  
Vol 6 (2) ◽  
pp. 63-86
Author(s):  
Dipesh Dhital ◽  
Yvonne Ziegler
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Computer Aided Design ◽  
Free Form ◽  
Aviation Industry ◽  
Layer By Layer ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Subtractive Manufacturing ◽  
Aided Design

Additive Manufacturing also known as 3D Printing is a process whereby a real object of virtually any shape can be created layer by layer from a Computer Aided Design (CAD) model. As opposed to the conventional Subtractive Manufacturing that uses cutting, drilling, milling, welding etc., 3D printing is a free-form fabrication process and does not require any of these processes. The 3D printed parts are lighter, require short lead times, less material and reduce environmental footprint of the manufacturing process; and is thus beneficial to the aerospace industry that pursues improvement in aircraft efficiency, fuel saving and reduction in air pollution. Additionally, 3D printing technology allows for creating geometries that would be impossible to make using moulds and the Subtractive Manufacturing of drilling/milling. 3D printing technology also has the potential to re-localize manufacturing as it allows for the production of products at the particular location, as and when required; and eliminates the need for shipping and warehousing of final products.

A Review on Additive Manufacturing of Ceramics

2019 ◽  
Author(s):  
Brooke Mansfield ◽  
Sabrina Torres ◽  
Tianyu Yu ◽  
Dazhong Wu
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Computer Aided Design ◽  
Ceramic Materials ◽  
Complex Geometries ◽  
Laminated Object Manufacturing ◽  
Challenges And Opportunities ◽  
Aided Design ◽  
Binder Jetting

Abstract Additive manufacturing (AM), also known as 3D printing, has been used for rapid prototyping due to its ability to produce parts with complex geometries from computer-aided design files. Currently, polymers and metals are the most commonly used materials for AM. However, ceramic materials have unique mechanical properties such as strength, corrosion resistance, and temperature resistance. This paper provides a review of recent AM techniques for ceramics such as extrusion-based AM, the mechanical properties of additively manufactured ceramics, and the applications of ceramics in various industries, including aerospace, automotive, energy, electronics, and medical. A detailed overview of binder-jetting, laser-assisted processes, laminated object manufacturing (LOM), and material extrusion-based 3D printing is presented. Finally, the challenges and opportunities in AM of ceramics are identified.

scholarly journals A review of the Application of Additive Manufacturing in Endodontic access opening using SLM process

2020 ◽  
pp. 281-285
Author(s):  
Roydan Dsouza
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Dental Pulp ◽  
Computer Aided Design ◽  
Physical Models ◽  
3 Dimensional ◽  
Development Cycle ◽  
Computer Aided ◽  
Product Development Cycle ◽  
Aided Design

3D Printing refers to a class of technology that can automatically construct 3-dimensional physical models from Computer Aided Design (CAD) data. Reduction of product development cycle time is a major concern in industries for achieving competitive advantage. Endodontic dentistry is the dental specialty concerned with the study and treatment of the dental pulp, and generally diagnose tooth pain and perform root canal treatment and other procedures relating to the interior of the tooth. This article, therefore, aims on being an assistive methodology in endodontics by applying 3D printing in order to reduce the strain involved in the tooth restoration process.

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