利用振动提高熔丝成型制品结合颈的机理分析

doi:10.13229/j.cnki.jdxbgxb.20211055

Abstract

Abstract:

The bonding neck between the extruded material filament is a key factor affecting the forming quality of fused filament fabrication products. Therefore， the novel method of using sinusoidal vibration to improve it is proposed， that is， using piezoelectric ceramic to apply longitudinal （along the melt flow direction） sinusoidal vibration to the extrusion liquefier to increase the bonding neck， and thereby to improve the built products′ forming quality. The vibration modification on the fused filament fabrication equipment was completed， based on which the testing samples were prepared. Each sample′s bonding neck was measured with electron microscope. The corresponding theoretical model was established， and the predictions were compared with the measurements. The test results show that using vibration can effectively increase the bonding neck， which further increases with the increasing vibration frequency or amplitude. The growth of the horizontal and longitudinal bonding neck is up to 21.4% and 22.3%， respectively. The difference between the predicted and measured results is 2%~12%， indicating that the proposed model is correct and reliable， and it can predict the bonding neck accurately.

Key words: fused filament fabrication, bonding neck, vibration, sinusoidal

CLC Number:

TH113.1

Shi-jie JIANG,Pi-feng CHEN,Ke HU,Xu-zhen HUANG,Ming ZHAN. Mechanism analysis on improving bonding neck of fused filament fabrication products by using vibration[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(7): 1920-1928.

Figures/Tables 14

Fig.1

Fig.2

Table 1

Table 2

Samples type"

样件（i=1~4）	是否施加振动	振动频率/Hz	振动幅值/ $g$
$R 00_i$	否	0	0
$R 100 0.1_i$	是	100	0.1
$R 200 0.1_i$	是	200	0.1
$R 300 0.1_i$	是	300	0.1
$R 400 0.1_i$	是	400	0.1
$R 400 0.1_i$	是	400	0.1
$R 500 0.1_i$	是	500	0.1
$R 500 0.1_i$	是	500	0.1
$R 600 0.1_i$	是	600	0.1
$R 600 0.1_i$	是	600	0.1
$R 700 0.1_i$	是	700	0.1
$R 700 0.1_i$	是	700	0.1
$R 700 0.2_i$	是	700	0.2
$R 700 0.2_i$	是	700	0.2
$R 700 0.3_i$	是	700	0.3
	是	700	0.3
	是	800	0.1
	是
$R 800 0.1_i$
		800
	是
$R 800 0.2_i$	是		0.2
$R 800 0.2_i$	是	800	0.2
$R 800 0.3_i$	是		0.3
$R 800 0.3_i$	是		0.3
$R 900 0.1_i$	是	900	0.1
$R 900 0.2_i$	是	900	0.2
$R 900 0.3_i$	是	900	0.3

Table 2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Table 3

Comparison of theoretical and average experimental results of bonding neck of FFF samples"

样件（i=1~4）	横向结合颈			纵向结合颈
样件（i=1~4）	理论值/μm	平均实验值/μm	误差/%	理论值/μm	平均实验值/μm	误差/%
$R 00_i$	297.4	285.7	3.93	40.12	45.53	11.89
$R 100 0.1_i$	310.2	290.0	6.5	41.76	46.81	10.79
$R 300 0.1_i$	330.5	313.3	5.2	44.23	48.74	9.2
$R 500 0.1_i$	345.6	312.8	9.2	45.92	52.12	11.9
$R 700 0.1_i$	356.6	332.3	6.8	47.10	52.37	10.1
$R 900 0.1_i$	364.4	339.5	6.8	47.81	53.32	10.3

Table 3

Fig.8

Table 4

Theoretical and average experimental results of bonding neck of FFF samples built with different vibrations utilized （same amplitude but different frequencies）"

样件（i=1~4）	横向结合颈			纵向结合颈
样件（i=1~4）	理论值/μm	平均实验值/μm	增幅/%	理论值/μm	平均实验值/μm	增幅/%
$R 00_i$	297.4	285.7	0	40.12	45.53	0
$R 200 0.1_i$	321.1	293.1	2.6	43.11	46.86	2.9
$R 400 0.1_i$	338.6	299.3	4.8	45.15	48.49	6.5
$R 600 0.1_i$	351.5	327.6	14.7	46.56	52.51	15.3
$R 800 0.1_i$	360.9	338.6	18.5	47.52	53.13	16.7

Table 4

Fig.9

Table 5

Theoretical and average experimental results of bonding neck of FFF samples built with differentvibrations utilized （same frequency but different amplitudes）"

样件（i=1~4）	横向结合颈			纵向结合颈
样件（i=1~4）	理论值/μm	平均实验值/μm	增幅/%	理论值/μm	平均实验值/μm	增幅/%
$R 00_i$	297.4	285.7	0	40.12	45.53	0
$R 700 0.1_i$	356.6	332.3	16.3	47.10	52.37	15
$R 700 0.2_i$	361.3	336.5	17.8	48.42	53.72	17.9
$R 700 0.3_i$	367.8	340.4	19.1	49.79	55.08	20.9
$R 800 0.1_i$	360.9	338.6	18.5	47.52	53.13	16.7
$R 800 0.2_i$	365.3	342.8	19.9	48.95	54.44	19.5
$R 800 0.3_i$	369.5	344.5	20.6	50.34	55.61	22.1
$R 900 0.1_i$	364.4	339.5	18.8	47.81	53.32	17.1
$R 900 0.2_i$	368.8	343.7	20.3	49.11	54.70	20.1
$R 900 0.3_i$	372.1	346.9	21.4	50.41	55.68	22.3

Table 5

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名称	数值	单位
幂律指数n	0.232	-
活化能E	67.526	kJ/mol
热导率k	0.08	W/（m·K）
系统对流系数h	0.195	W/（m²·K）
密度ρ	892	kg/m³
比热容C	2000	J/（kg·K）
挤出温度T₀	200	°C
入口半径r₁	0.9	mm
出口半径r₂	0.2	mm
长度L	1	mm
临界温度T	156	°C
参考温度T_A	150	°C
打印速度v	60	mm/s
打印层厚度L	0.15	mm
路径宽度E	0.4	mm

Mechanism analysis on improving bonding neck of fused filament fabrication products by using vibration

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