3D Printing Technologies and Composites

3D Printing Technologies and Composites Additive manufacturing, also known as 3D printing, is a method of creating a three-dimensional object layer by layer using a computer-generated design. In 3D printing, a digital model is transformed into a concrete, solid, three-dimensional object through the placement of many successive thin material layers. It is possible to convert almost anything we can visualize in our minds into a design that can be printed with a 3D printer. 3D printers help designers and engineers create complex objects in ways that were not possible with previous manufacturing methods. 3D printers are utilized in many fields such as tool, equipment, and toy manufacturing, phone cases, clothing, furniture, lamps, pottery production and even building construction. 3D printing is also used in the medical field to assist patients. Thanks to the precise and detailed medical models that are printed, surgeons can test on a 3D model of the patient before surgery. 3D printing technologies are generally divided into three main groups: sintering, melting and stereolithography. Sintering is a technology in which material is heated without exceeding its melting point to create high-resolution elements. Metal powder is used for direct metal laser sintering, while thermoplastic powders are used for selective laser sintering. Among 3D printing melting methods are powder bed fusion, electron beam melting and direct energy deposition. In this method, lasers, electric arcs or electron beams are used to print objects by melting materials together at high temperatures. Stereolithography, more commonly known as SLA 3D printing, works by using a high-powered laser to harden liquid resin to create the desired 3D shape and is one of the most popular and widely used techniques in the additive manufacturing world. This process converts light-sensitive liquid into solid 3D plastics in layers using a low-powered laser and photopolymerization.

Advantages of 3D Printing Technology

3D printing technology offers various advantages. One of these advantages is keeping labor costs low. Unlike traditional manufacturing where several different machines are operated or a production line is required to assemble products, with a 3D printer it is sufficient for one operator to run the machine and initiate the automation process for the loaded design. Additionally, 3D printing allows parts and products to be produced much faster compared to traditional methods. Complex designs can be created as a CAD model and brought to life in just a few hours. Thus design ideas are determined more easily and quickly. This is much more advantageous compared to traditional methods where it takes weeks or months to go from the design phase to the prototype phase and then directly to the production process. Accelerating the prototype phase allows businesses to receive quick feedback from potential buyers and investors. Unlike traditional manufacturing methods, the ability to modify and customize until the last moment makes it easier to test whether the product has both the potential to go to market and to succeed.

3D Printing Technology and Composites

Today, the most common raw material used in 3D printing is plastic. Plastic products are generally produced with FDM printers where thermoplastic filaments are melted and shaped layer by layer. Plastic parts created with 3D printers have various shapes and densities ranging from flat and round to grooved and porous. Considering hardness, flexibility, smoothness properties and bright color options, the demand for plastic is easily understood. The low cost of plastic, which has high tensile capacity without breaking while maintaining its mechanical and chemical properties, is also influential in its preference by manufacturers and consumers. Plastic parts are commonly used in the production of 3D printed toys and household items. In order to make plastic stronger, composites such as carbon fiber are used as the top layer over plastic materials in 3D printers. The combination of carbon fiber with plastic stands out as a fast and convenient alternative to metal in the 3D printing industry. Unlike traditional methods where prepregs or layers are manually placed inside molds, composite 3D printing enables process automation. After parameters are adjusted and the model is prepared for printing, printing occurs without additional effort. 3D printed composite materials are not only strong but also quite lightweight. Properties such as weight, strength and design freedom pave the way for the use of such materials in areas where battery, fuel and speed are important. At this point, it should be emphasized that one of the most important advantages of composite 3D printing is rapid prototyping. By using CAD to create a part, it is possible to proceed directly from design to production without having to start an entire production line or waste material, without any extra cost, and without needing to adjust models after the first prototype. This is particularly important for small businesses, as it reduces end-user prices for customizable parts in small production runs. Graphene has become a popular material in 3D printing technology thanks to its strength and electrical conductivity. The material is ideal for device parts that need to be flexible, such as touchscreens. Graphene, one of the most flexible among 3D printing materials, is also used in the production of solar panels and structural parts.   Sources https://www.twi-global.com/technical-knowledge/faqs/what-is-3d-printing https://edu.gcfglobal.org/en/thenow/what-is-3d-printing/1/# https://all3dp.com/2/stereolithography-3d-printing-simplyexplained/ https://anisoprint.com/blog/composite-3d-printing-101-benefits-technologies-applications/ https://www.sharrettsplating.com/blog/materials-used-3dprinting/= good source for materials https://tractus3d.com/knowledge/learn-3d-printing/advantages-of-3d-printing/   Prepared by: Murat Soygür