Abstract
Additive manufacturing has been applied in many fields, but its layer-by-layer fabrication process leads to a weak inter-layer bond strength of printed parts, so it cannot meet the higher requirements for mechanical properties of the industry. At present, many researchers are studying the printing path planning method to improve the mechanical properties of printed parts. This paper proposes a method to plan the printing path according to the actual stress of pipe parts, and introduces the realization process of an algorithm in detail, and obtains the printing control G-code. Additionally, a 5-axis material extrusion platform was built to realize the printing of polylactic acid pipes with plane and space skeleton curves, respectively, which verified the feasibility and applicability of the method and the correctness of the planning path with standard material extrusion filaments. Finally, the tensile and bending experiments prove that axial printing enhances the mechanical properties of pipe parts.
Highlights
Additive manufacturing (AM), known as 3D printing (3DP), has many advantages, such as complex structure construction, short shaping cycle and high material utilization rate, so it has attracted the attention of many scholars worldwide
The inner surface of the part to be printed is extracted, and the pipe support is printed using the traditional 3D printing method according to the conventional slicing
Since there is no standard for the direct testing of pipe parts, the test samples were conducted by using the plastic tensile property testing standard GB/T 1040.2-2006/ISO 527-2:1993, were generated by simulating the axial printing path of pipe parts, and the mechanical testing and the plastic bending property testing standard GB/T 9341-2008/ISO 178:2001
Summary
Additive manufacturing (AM), known as 3D printing (3DP), has many advantages, such as complex structure construction, short shaping cycle and high material utilization rate, so it has attracted the attention of many scholars worldwide. It has achieved many results in materials, process, and equipment. It has been widely used in many fields [1,2,3]. AM technology still has some technical limitations, mainly including layer-by-layer stacking printing process resulting in a step effect and low surface accuracy, and insufficient adhesion between layers results in low strength in the Z-axis direction. Taking the most common material extrusion (MEX) process, it is necessary to produce supporting structures when printing cantilever or hollow parts, so that the printing time and material costs are inevitably increased. For solving the above problems, researchers in various countries have carried out a lot of research work on printing path planning methods
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