Printing path generation method of metal additive manufacturing

Abstract

The invention belongs to the technical field of 3D printing and particularly discloses a printing path generation method of metal additive manufacturing. The printing path generation method comprisesthe following steps that a model to be printed is layered so that section layers can be obtained; the section layers are partitioned, and a plurality of printing sub-regions are formed; a first randomnumber sequence determining the printing sequence of the multiple printing sub-regions is correspondingly generated for each section layer; and for the section layer, the printing sub-regions are sequentially printed according to the corresponding first random number sequence. According to the printing path generation method of the metal additive manufacturing, by means of the random distributionthought, the residual stress can be effectively reduced, the thermal deformation is reduced, and the surface quality and the size precision of parts are improved.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a printing path generation method for metal additive manufacturing. Background technique [0002] The forming of metal additive manufacturing from microscopic molten pool to macroscopic structure has brought a subversive revolution to the design and manufacture of many key components in aero-engines, enabling many structures to change the mechanical properties of the structure from subsurface microstructure design, So as to meet the use requirements of components. The forming process of metal additive manufacturing is a process of layer-by-layer accumulation. Points are connected to form lines, lines are overlapped to form surfaces, and surfaces are accumulated to form a body. During the molding process, the shape of the workpiece is dynamically growing, and the molding temperature field and the state of the material are dynamically changed along with the scanning path. This...

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Problems solved by technology

[0003] The prior art discloses a partition-based 3D printing filling path generation method. The partition-based 3D printing filling path generation method is suitable for models of various shapes, and is easy to implement, has good versatility, and is easy to commercialize. It involves the influence of the printing path on the thermal deformation of parts, residual stress, surface quality and dimensional accuracy; the prior art also discloses a 3D printing path planning method based on Fermat's spiral, which divides any topologically connected area into multiple The independent sub-regions are filled with Fermat's helix, and the global optimization method is used to smooth the printing path under the constraint of keeping the width of the printing path consistent, but this method does not involve the thermal deformation of the printed parts, residual stress, and surface quality. and the influence of dimensional accuracy

[0004] In summary, most of the existing technologies only consider the influence of the printing path on the forming accuracy and efficiency of the parts, but there is no printing path strategy that can effectively control thermal deformation, reduce residual stress, and improve surface quality and dimensional accuracy for rotationally symmetrical parts of aero-engines.

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