Method for optimizing forming orientation of SLM additive manufacturing workpiece
A technology of additive manufacturing and optimization method, applied in the field of additive manufacturing, which can solve problems such as insufficient optimization effect, incomplete application, and low printing quality of workpieces
Active Publication Date: 2020-10-30
TSINGHUA UNIV +1
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This method analyzes the topological shape of the workpiece as a whole, which does not conform to the characteristics of layer-by-layer forming of additive manufacturing, so it cannot be fully applied to additive manufacturing. There may still be a large degree of heat concentration on the overhanging surface, and the optimization effect is insufficient. The printing quality of the workpiece not tall
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[0027] The drawings illustrate embodiments of the invention and it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms and therefore specific details disclosed herein should not be construed as limiting. , but merely as a basis for the claims and as an illustrative basis for teaching one skilled in the art to variously practice the invention.
[0028] In the description of this specification, it should be understood that the orientation words such as "up" and "down" described in the embodiments of the present application are described from the perspective shown in the drawings, and should not be interpreted as a description of the embodiments of the present application. limited.
[0029] The present application will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.
[0030] In the workpiece additive manufacturing process, it is necess...
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The invention provides a method for optimizing the forming orientation of an SLM additive manufacturing workpiece. The method comprises the steps of obtaining a three-dimensional model of the workpiece; rotating the workpiece three-dimensional model around the X-axis and the Y-axis in a stepping manner, and obtaining a workpiece sub-model after each rotation by adopting coordinate transformation;performing spatial discretization on each workpiece sub-model, and calculating a temperature field of each workpiece sub-model in the SLM additive manufacturing forming process by adopting a numericalsimulation method; analyzing the temperature field of each workpiece sub-model, determining the high-temperature area of each workpiece sub-model, arranging the high-temperature areas into N sectionsaccording to a high-low sequence, and determining the average temperature Tj of the high-temperature area in the j section and the number delta nj of the high-temperature areas in the j section; calculating a temperature uniformity index IT of each workpiece sub-model according to a principle that the influence of a high-temperature area is minimum, and selecting the workpiece sub-model with the highest temperature uniformity index IT as a workpiece optimal orientation three-dimensional model; and converting the optimal orientation three-dimensional model of the workpiece to obtain anSTL format file of the optimal orientation three-dimensional model of the workpiece for additive manufacturing of the workpiece.
Description
technical field [0001] The invention relates to the field of additive manufacturing, in particular to a method for optimizing the forming orientation of a SLM additive manufacturing workpiece. Background technique [0002] Selective laser melting (SLM) is an important additive manufacturing technology. The forming of the workpiece requires a design support to support the overhanging surface of the workpiece. The support design is closely related to the forming orientation of the workpiece. Different forming orientations and different support designs will affect the quality of the printed workpiece due to slow heat transfer and easy heat concentration on the overhanging surface. In addition, the conventional optimization method of the forming orientation of the workpiece is mainly optimized for the topological structure characteristics of the workpiece, such as directly judging the area of the overhanging surface under different orientations, and by comparing the area of ...
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IPC IPC(8): G06F30/23G06T17/20G06F113/10G06F111/10G06F119/08
CPCG06F30/23G06T17/20G06F2113/10G06F2111/10G06F2119/08Y02P10/25
Inventor 康进武王想王建庄
Owner TSINGHUA UNIV