Investigation into particle flow patterns during powder spreading in SLM process

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-07 DOI:10.1016/j.powtec.2024.120429

Qipeng Liu , Qiuqiang Zhou , Yuehua Gao , Zheng Liu , Xihua Chu , Zhao Zhang , Yuhua Chen

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引用次数: 0

Abstract

Particle flow patterns and their variation mechanism during powder spreading in selective laser melting (SLM) are comprehensively investigated based on discrete element method. Two typical particle flow patterns, circulation and discharge, are identified. The patterns are found to alternate during powder spreading, and the underlying dynamical mechanism are clarified. Variations in the particle flow state across the gap induce variations in vertical velocities of particles in front of the blade, affecting the particle flow pattern. Effect of process parameters on flow pattern is studied, and the dynamical mechanism of the effect is analyzed in depth by two newly proposed indexes. Decreasing gap height, and increasing spreading speed and blade inclination, reduce the proportion of particles moving downward in shear band and enhance inter-particle forces near the gap, thus weakening discharge and intensifying circulation. This study provides a beneficial insight into the powder flow during powder spreading in SLM process.

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研究 SLM 工艺中粉末铺展过程中的颗粒流动模式

基于离散元方法，对选择性激光熔融（SLM）中粉末铺展过程中的颗粒流动模式及其变化机理进行了全面研究。确定了两种典型的颗粒流动模式：循环和排出。研究发现这两种流动模式在粉末铺展过程中交替出现，并阐明了其背后的动力学机制。颗粒在间隙中的流动状态变化会引起叶片前方颗粒垂直速度的变化，从而影响颗粒的流动模式。研究了工艺参数对流动模式的影响，并通过两个新提出的指标深入分析了影响的动力学机制。降低间隙高度、提高铺展速度和叶片倾斜度，可减少剪切带中向下运动的颗粒比例，增强间隙附近的颗粒间作用力，从而减弱排出，加强循环。这项研究对 SLM 工艺中粉末铺展过程中的粉末流动提供了有益的启示。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.