| 词条 | Draft:3D Printing Support Material |
| 释义 |
3D printing supporting material [1] is used in the fused deposition molding (FDM) 3D printing technology. During the printing process, the parts of the suspended structure or hollow structure of the auxiliary products are formed, and the materials to be removed after the printing is completed. The working principle of Fused Deposition Modeling (FDM) 3D printing technology [2] is that the hot melting materials (ABS, PLA, wax, etc.) are processed into filaments, which are transported to the hot melt printing nozzle through wire feeding mechanism. The filaments or linear plastic materials are heated to the melt state in the nozzle, and the nozzle moves along the shape profile and trajectory of the parts under the control of computer. The melted material is extruded and deposited in the expected position, then solidified and formed, which is bonded with the previously formed layers of material, and stacked layer by layer to form the product model. In the printing process, each layer is stacked on the top layer, which plays a role in positioning and supporting the current layer. When the product has suspended structure or hollow structure, it needs to design some auxiliary structure - "support" to provide positioning and support to ensure the smooth realization of the forming process. Currently, there are three types of support materials and technologies: The first is a strip type frame materials [3], the same material as the body will be printed into a loose structure in the parts that need to be supported. After printing, remove the supporting material from the main material by physical means (such as using a knife or other tools). This method has some shortcomings, such as difficult operation, difficult removal of the supporting material itself and easy destruction of the main material. Second is dissolved type support materials [4], which is mainly water-soluble materials such as polyvinyl alcohol, acrylic acid copolymer and so on [5], After printing, the finished product is immersed in water, and the water-soluble characteristic of the supporting material is utilized to remove it. The surface quality of the product itself is better protected. However, water-soluble materials have poor cohesion with bulk materials, and there is usually a swelling process before dissolution, sometimes causing some damage to the products. It is also reported that a HIPS material [6] can be dissolved in limonene, but the cost of using limonene is higher. Thirdly, decomposed 3D printing support material [7]. Which has reported by "Mechanical Engineering Materials" No.5,2018. When the printed parts are finished, they are immersed in acidic liquids at a certain temperature, and the supporting materials will be decomposed into gases and removed. This decomposition material use polyformaldehyde (POM) as the basic material and is composed by adding other materials. POM is a common engineering plastics with low price and good supporting effect. It has no effect on the appearance of products after decomposition. Moreover, the decomposition characteristics of POM materials can open up the application of FDM 3D printed products in fields such as EPC, which has a good prospect. References[1] L Li, Q Sun; C Bellehumeur; P Gu.Composite modeling and analysis for fabrication of FDM prototypes with locall.Journal of Manufacturing Processes, 2002, 4(2), 129~141. [2] Dickens P M.Research developments in rapid prototyping[J].Journal of Engineering Manufacturing, 1995, 209(3): 261~265. [3] S Scott Crump. Make RP models in end-product material. Design Engineering, 2003,49(5):20. [4] S.H.Masood, W.Q.Song. Development of new metal/polymer materials for rapid tooling using Fused deposition modeling. Materials and Design,2004,25:587~594. [5] Singh R. Some investigations for small-sized product fabrication with FDM for plastic components[J]. Rapid Prototyping Journal,2013,19(1):58-63. [6] Analysis of Advantages and Disadvantages of Soluble Supporting 3D Printing Materials. https://3dprint.ofweek.com/2016-10/ART-132102-8470-30059693.html [7] Li Tianyi, Ma Chao. Effect of parameters on catalytic decomposition rate of thermoplastic polyurethane modified polyformaldehyde plastics in hydrochloric acid [J]. Mechanical engineering materials, 2018, 42 (05): 59-62. 3D Printing Support Material |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。