The possibilities of Additive Manufacturing in medical use

Additive Manufacturing has been invented in 1981 at the University of Texas, and to this day it has grown to be the most versatile and promising manufacturing technology in the market, both the industry and health care system has noticed this. Additive Bio-Manufacturing (ABM) techniques, which can be used in health care, are highly in demand, and researches have been going on to make these technologies safer and even more versatile. For more utilization and versatility, special attention is required to develop new materials which can help in increasing the service life, bioactivity, cell growth along with the desired mechanical properties, and to find the right manufacturing parameters for creating optimal products. The aim of this review is to present the available main Additive Manufacturing technologies, and particularly the biomedical usability of Additive Manufacturing.

Additív gyártástechnológiával előállított hőálló PLA anyag szilárdsági vizsgálata

Az utóbbi években egyre több helyen alkalmazzák az additív gyártástechnológiákat az egyedi, valamint a kisszériás gyártásban. Ilyen esetekben az alkatrésznek valós körülmények közt is működőképesnek kell maradnia. Ez azt jelenti, hogy teherviselőnek is kell lennie. Sok esetben szilárdsági szempontból már megfelelnek az anyagok. Ugyanakkor sok esetben (gépalkatrészek, kültéri felhasználás) a modelleknek nagyobb hőmérsékleten is megbízhatóan kell működniük. Erre kínál lehetőséget a legelterjedtebb additív gyártástechnológia esetében (FDM) egy új, hőtűrő anyag a HT PLA. Sok esetben a hűtés alkalmazása elengedhetetlen a gyártás során, különösen a nagy túllógásokkal tűzdelt alkatrészek esetében, ahol szükséges az anyag mielőbbi megszilárdulása a megfelelő felületminőség eléréséhez. Cikkünkben a gyártás során alkalmazott hűtésnek a mechanikai szilárdságra gyakorolt hatását vizsgáltuk.

Linear elastic finite element investigation of titanium specimen produced by Additive Manufacturing

Nowadays orthopaedic implants are mainly fabricated from solid material (titanium alloy). The mechanical properties of these implants are much stronger than human bone tissue’s properties, and this leads to fixation problems and a short lifetime, but today these problems can be eliminated with the usage of metal additive manufacturing. The mechanical properties of the implants can be influenced on demand with the variation of the material structure using different sizes and types of unit cells for building up its structure.

Tribological Behaviour Comparison of ABS Polymer Manufactured Using Turning and 3D Printing

Additive and subtractive manufacturing of Acrylonitrile Butadiene Styrene (ABS) were employed for fabricating samples. The Additive manufacturing was represented through 3D printing, whereas subtractive manufacturing carried out by Turning. Some developments have been applied for enhancing the performance of the 3D printer. Tribological measurements of the turned and 3D printed specimens have been achieved. Studying the difference between static and dynamic friction factors and the examination of wear values were included. A comparison of the tribological behaviour of the turned and 3D printed ABS polymer has been investigated.

Finite element analysis of cellular structures using Ansys

Additive manufacturing (AM) is a process in which the product is composed of overlapping layers of a material that is added using devices such as 3D printers. Its process has been evolving for decades and nowadays it can be used for several applications and with different materials. One modern usage is for medical and dental purposes. Since it became possible to print metal, it has been a good solution for bone implants, once it must be done with biomaterials and can now replicate the bone structure, for that unit cells should compose the implant. Both conditions are now possible to be achieved by AM, and the current study will analyze, using finite element method, the possibilities to create specimens for tests which the final product would result in a 3D printed bone implant.

Solid-Lattice Stem Optimization Design for Hip Implants

The goal of this study is analyzed and design a methodology to reduce stem mass, through topology and lattice optimization of a Ti-6Al-4V hip implant, meeting yield stress requirements. Four optimization cases were studied: Topology optimization (1), Lattice design 100% (2), Lattice design 50% (3), Lattice design 25% (4). Five load cases from a study were applied for each optimization cases: Combined (LC1), standing-up (LC2), standing (LC3), going up stairs (LC4), jogging (LC5). The optimized cases design reduced stem mass approximately by 30% (1), 5% (2) ,8% (3) and 2% (4), compared with the total stem hip Ti-6Al-4V implant.

Analysis of Thermal Degradation in the Annealing Process of Colored Parts Built by Extrusion-Based 3D Printing

With the ever-increasing request of light materials, poly lactic (acid) PLA, have got much in consideration. Low-cost PLA materials have risen its use. Those possess some benefits but nevertheless insufficient mechanical strength. The printed PLA objects have a stumbling block for practical applications. Thus, annealing is an interested alternative to make 3D printed objects strong. This thermal treatment can significantly develop investigational studies and offer technical data. Hence the purpose of this paper is study and discuss how to increase the flexural strength through annealing process. Geometry distortions and color degradation will be analyzed. Differential Scanning Calorimetry, Taguchi Method (TM) and variance (ANOVA) were applied as part of the design experiments and analysis. Twenty-seven printed specimens were tested and factors as temperature, time and color were selected.

Analysis of a Special, 3D Metal-Printed HPDC Tool Material

High Pressure Die Casting (HPDC) is still the most productive metal-casting method of our time, however the more demanding are the industrial expectations, the more challenging it becomes to ensure the creation of the difficult cavity geometries and the thermal balance of the die-cast tool. New perspective is required, thus we can utilize high heat-conductivity tool steels and additive manufacturing technology.

Additív gyártástechnológia alkalmazása szélcsatornás szimulációkhoz

Napjaink gazdasági szemlélete megköveteli többek között a reoülőgép üzemeltetőktől is, hogy egyre inkább a karbosemlegesség felé szervezzék át működésüket különböző innovatív technológiák bevezetésével.

Jelen tanulmány célja, hogy mely innovatív formájának köszönhetően hozzájárul a repülőgépek üzemanyagfogyasztásának, ezáltal a légszennyezés lecsökkentéséhez.

Utilization of 3D Printing in Replacement of Basic Plastic Workpieces

In the experiment, a 3D printed cogwheel is made using the FDM technology to replace a broken part in a sewing machine. The aim of the project is to examine if a 3D model can be created and manufactured using only entry-level technical knowledge and tools. By the end of the article, it will be apparent that creating functioning plastic parts with a hobby 3D printer and basic CAD experience is very much possible.