金属熔丝成型复合丝材流体动力学特性

doi:10.13229/j.cnki.jdxbgxb.20231144

Abstract

Abstract:

Concerning the rheological problems affecting the quality of composite filament in metal fused filament fabrication， Firstly， self-made three types of 17-4PH stainless steel powder/polymer composite filaments with different high filling rate were studied in this paper， rapid prototyping equipment was used to conduct molding research on green samples， and the formability conditions of the composite filaments were canalized. Secondly， the pressure drop of the molten composite filament with different metal powder filling ratio during the shaping process was measured by the self-constructed experimental platform， and the test results of the relevant rheological properties were analyzed. Thirdly， an rheological property model of the molten material was established， and the theoretical analysis on the corresponding characteristic parameters was completed. Through the comparison between the theoretical and experimental results， the correctness of the theoretical model was verified， and the mechanism of the rheological properties of molten materlals were elucidated. Finally， a sensitivity analysis was carried out on the analytical model to investigate the influence of processing parameters on rheological property. The results show that the self-made composite filament can be used to form good-quality green samples； the rheological property parameters of the molten material gradually increase with the increasing filling ratio of the metal powder； the theoretical and experimental results are in good agreement， validating the correctness of the analytical model； the nozzle diameter has the most significant effect on the melt flow behavior of the molten material in the discussed parameter ranges， followed by the building speed， while the effect of the molten temperature is relatively weak.

Key words: mechanical engineering, metal fused filament fabrication, 17-4PH stainless steel/polymer composite filament, rheological property, analytical model

CLC Number:

TH145.9

Shi-jie JIANG,Shu-guang LI,Zi-zhao XU,Fei WANG. Rheological property of composite filament in metal fused filament fabrication process[J].Journal of Jilin University(Engineering and Technology Edition), 2025, 55(7): 2180-2192.

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References 14

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过程参数	数值
熔融温度/℃	240
成型速度/（mm·s^-1）	10
层厚/mm	0.25
床温/℃	90
喷嘴直径/mm	0.4
填充比例/%	100
填充方式	直线填充

实验名称	实验标准	加载速度/（mm·min^-1）	夹持力/MPa	实验次数
拉伸实验	ISO527—4：2023	5	2	5
压缩实验	ASTM—695	1	—	5
弯曲实验	ISO178—2001	2	—	5

符号	释义	数值
D₁/mm	区域Ⅰ处的直径	1.75
D₂/mm	区域Ⅲ处的直径	0.4
L₁/mm	区域Ⅰ处的长度	10
L₂/mm	区域Ⅲ处的长度	0.6
θ/（°）	喷嘴的收缩角	60

金属粉末体积填充率/%	拉伸实验				压缩实验			弯曲实验
金属粉末体积填充率/%	平均最大拉伸力/N	平均拉伸强度/MPa	平均拉伸模量/MPa	平均断裂应变/%	平均最大压缩力/N	平均压缩强度/MPa	平均压缩模量/MPa	平均最大弯曲力/N	平均弯曲强度/MPa	平均弯曲模量/MPa	平均断裂应变/%
40	359.5	9.0	530.3	4.01	6 853.3	54.1	533.8	26.7	16.1	601.2	2.79
45	351.9	8.8	615.2	3.30	5 421.1	42.8	628.7	24.5	14.7	746.3	2.01
50	332.8	8.3	751.1	2.16	4 171.6	32.9	725.4	20.3	12.2	905.4	1.48

体积填充率/%	K	n
40	730.6	0.533 4
45	1 225	0.510 2
50	2 097	0.496 8

Rheological property of composite filament in metal fused filament fabrication process

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