Post processing operation of 3D printing composite

2022-09-22
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Post processing operation of 3D printing composite mold under FDM technology

the plastic extruded layer formed by traditional metal and FRP (fiber reinforced polymer) mold often needs post-processing after the initial molding or grinding process after leaving the machine head. Post treatment steps include the assembly of backing or support structures, the addition of inserts/bushings, and frequent polishing to achieve the desired surface finish. Similar to traditional tool technology, FDM composite mold usually needs a certain degree of post-processing, which depends on the size, application and complexity of the tool. The most common post-treatment operation of FDM composite dies is sealing

in this article, we will discuss the post-processing of 3D printing composite dies produced by FDM technology

Technical Specification for welding of building steel structures JGJ 81 (2) 002

surface treatment:

various methods can be used to improve the surface roughness of FDM tool surface, including manual grinding, medium sandblasting, tumbling and degreasing. At present, the surface finish requirements are met (64 μ INRA) and provide vacuum integrity. The best practice is manual abrasion, followed by the application of epoxy sealant, figure 2 The recommended grinding and sealing process is detailed in FDM Appendix B. the composite mold design guide. However, the basic method consists of two thin layers of high-temperature epoxy sealant, and light polishing is required between each coating to maximize the adhesion. After the second layer of epoxy resin, use gradually finer sand gravel paper () to achieve the required surface roughness. It is important to note that the goal of this process is not to get the layer line out, but to fill the low points of the surface, remove any obvious convex parts, and maintain the integrity of the smooth surface

sealing method:

as mentioned above, the inherent porosity in FDM composite tools can be solved by using epoxy tree, and China's electronic universal experimental machine has also obtained a certain amount of developed grease sealant. Although STRATASYS usually uses tool epoxy resin called bjbtc-1614, various epoxy resins can be used as long as the selected material can withstand the required curing process

other methods to solve the needs of surface treatment and sealing include FEP films supported by adhesives, such as TOOLTEC? Of airtechinternational, Inc? And toolwright. FEP film is usually faster and more convenient than traditional epoxy sealant. However, they may be difficult to apply to composite profiles, and they are usually not as strong as epoxy seals and need to be replaced after a few cycles. The unique properties of FEP films make them very suitable for repair tools and other occasions that require several parts

similar to conventional tools, FDM composites, but Boeing has stated that it is checking its own supply chain tooling, which usually requires a certain degree of post-processing. STRATASYS continuously evaluates alternative post-treatment methods and sealers to improve performance and simplify the finishing process. Degreasing coating processing is an alternative process, which has shown some advantages

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