Research On Thermal Analysis And Optimization Of 3D Printing Machine Heat Sink Structure

Fused Deposition 3D Modeling is a kind of rapid prototyping technology which is the world’s most widely used technology currently, and domestic FDM printing equipment of consumption level and desktop level is developing quite swiftly in recent years. The main reason is that Fused Deposition Modeling technology has been quite mature and has a wide popularization as well; secondly the reason is that the manufacturing costs of FDM typical printer are relatively economical, and manufacturing requirements is really low. Nowadays, most domestic and overseas FDM typical forming products often have some problems such as wire feeding is unstable and exflagellation is uneven in the print process, resulting in an obvious decline in print quality. Therefore, the analysis about the effect which guiding wire and molten material extrusion have on the driving force of molten material extrusion, and it has an important significance to improve the FDM printers’ printing speed and printing stability.The achievement of molten material extrusion process needs guide wire mechanism, heating system and the nozzle system to be completed, as its driving force of molten material extrusion and those structure are closely related. This article firstly starts to carry out the research about defects of short-distance wire feeding FDM printer, design a new kind of self-cooling short distance wire feeding mechanism; carry out heat-structure coupling analysis through the finite element software of HYPERWORKS, and verify the feasibility of the design.Then, based on the orthogonal experiment analysis method and the finite element testing method, carry out optimization design to the guiding wire and heat sink in the structure; Based on the first orthogonal experiment, carry out significance analysis to the structure size design factor of by using variance analysis method, and the optimization results are verified; carry out 3 levels of quadratic orthogonal experiment design to the 3 dimension parameters of high significant, and a set of optimal solution is obtained by range analysis.Finally, carry out modeling about structure size parameter by using 3D CAD software, import to the finite element software to carry out heat transfer analysis, analyze temperature distribution of wire feeding tube, and the space size and volume of heat radiation structure is decreased significantly under the guarantee of radiating performance. Compared with the original design model, the optimized volume is fell by 1/4, and the space volume is fell by more than 1/3, thus the study of this paper provides theoretical foundation to the structural size design and optimization of the heat radiation, and it has certain guiding significance to the design of nozzle cooling structure by 3D printing device.