Printing-Time-Estimation Algorithm for Selective Laser Melting Multi-Galvanometer System

Fengqiang Weng; Yongqiang Yang; Xin Chen; Yang Li

doi:10.3788/CJL202148.1802019

Journals >Chinese Journal of Lasers >Volume 48 >Issue 18 >Page 1802019 > Article

Chinese Journal of Lasers
Vol. 48, Issue 18, 1802019 (2021)

Printing-Time-Estimation Algorithm for Selective Laser Melting Multi-Galvanometer System

Fengqiang Weng, Yongqiang Yang^*, Xin Chen, and Yang Li

Author Affiliations

School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China

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DOI: 10.3788/CJL202148.1802019 Cite this Article Set citation alerts

Fengqiang Weng, Yongqiang Yang, Xin Chen, Yang Li. Printing-Time-Estimation Algorithm for Selective Laser Melting Multi-Galvanometer System[J]. Chinese Journal of Lasers, 2021, 48(18): 1802019 Copy Citation Text

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Fig. 1. Principle of powder spreading selective laser melting equipment

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Fig. 2. Program flow chart of the printing time estimation algorithm of the SLM multi-galvanometer system

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Fig. 3. Experimental process parameters and sample information. (a) Appearance of DiMetal-450; (b) print sample model

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Fig. 4. Experimental results. (a) Scanning system time estimation and actual time fitting effect diagram; (b) scanning system deviation rate and proportional coefficient change trend

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Fig. 5. Experimental results. (a) Time estimation effect diagram of printing task; (b) change of printing time estimation deviation rate

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Polygon type	V_Mark/(mm·s^-1)	V_Jump/(mm·s^-1)	t_mDelay/μs	t_pDelay/μs	t_jDelay/μs	p_or	P /W
Fill	3000	2000	1000	550	3000	(0,0)	480
Counter	2000	2000	1000	550	3000	(0,0)	380

Table 1. Process parameters that affect time estimation

Volume /mm³	Slice thickness /μm	Number of slices	Material	Part type
1382663.404	50	1000	316L	Solid

Table 2. Basic information of experimental samples

Layer type	Space /mm	Type of fill	Fill mode	Block size /(mm×mm)	Scan region
Odd layer	0.1	Straight line	whole	--	Evenly split
Even layer	0.1	Straight line	block	40×40	Evenly split

Table 3. Slice scanning path strategy

Layer number	$t_{LP 1}^{laye r^{*}}$ /s	$t_{LP 2}^{laye r^{*}}$ /s	$t_{mp}^{*}$ /s	$t_{mG}^{*}$ /s
256	124	130	18	4
304	123	130	18	4
352	122	129	18	4
404	120	125	18	4
452	118	121	18	4
504	115	117	18	4
552	109	113	18	4
604	62	56	18	4
652	62	56	18	4
704	62	56	18	4
752	62	56	18	4
804	61	56	18	4
852	62	57	18	4
904	43	39	18	4
952	43	38	18	4
996	43	38	18	4

Table 4. Actual running time parameters of experimental samples

Layer number	$t_{LP 2}^{laye r^{*}}$ /s	$t_{LP 2}^{sm}$ /s	β	$t_{LP}^{layer}$ /s	p_l/%
256	130	140.007	0.9258	129.618	-0.2943
304	130	140.942	0.9254	130.428	0.3279
352	129	140.473	0.9230	129.657	0.5063
404	125	136.575	0.9212	125.812	0.6461
452	121	132.590	0.9195	121.917	0.7517
504	117	128.738	0.9178	118.156	0.9781
552	113	124.482	0.9165	114.088	0.9534
604	56	63.362	0.9144	57.938	3.3453
652	56	63.180	0.9128	57.670	2.8969
704	56	63.180	0.9113	57.576	2.7371
752	56	63.181	0.9100	57.495	2.5997
804	56	63.170	0.9088	57.409	2.4541
852	57	63.165	0.9085	57.385	0.6716
904	39	43.424	0.9082	39.438	1.1098
952	38	43.423	0.9072	39.393	3.5370
996	38	43.421	0.9062	39.348	3.4261

Table 5. Scanning system time estimation analysis

Layer number	Working time /h	Estimate working time /h	p_t/%	Estimate remaining time /h	t_work/h
256	15.9289	16.0245	-0.5966	20.7961	36.8206
304	18.0089	18.0990	-0.4978	18.8811	36.9801
352	19.7422	19.8334	-0.4598	17.1080	36.9414
404	21.6055	21.7062	-0.4639	15.1519	36.8581
452	23.4588	23.5828	-0.5258	13.4316	37.0144
504	25.4088	25.5428	-0.5246	11.0626	36.6053
552	27.1555	27.3026	-0.5388	9.2898	36.5924
604	28.9900	29.1490	-0.5455	7.4261	36.5751
652	29.9233	30.1068	-0.6095	6.4579	36.5648
704	30.9344	31.1301	-0.6287	5.4157	36.5458
752	31.9455	32.0833	-0.4295	4.6430	36.7264
804	32.9566	33.1149	-0.4780	3.4201	36.5351
852	33.9000	34.0968	-0.5772	2.4674	36.5642
904	34.9255	35.1236	-0.5640	1.4359	36.5595
952	35.6322	35.8355	-0.5673	0.7073	36.5428
996	36.2678	36.4875	-0.6021	0.0328	36.5203
999	36.3111	36.5213	-0.5756	0	36.5213

Table 6. Practical analysis of time estimation for printing tasks

Fengqiang Weng, Yongqiang Yang, Xin Chen, Yang Li. Printing-Time-Estimation Algorithm for Selective Laser Melting Multi-Galvanometer System[J]. Chinese Journal of Lasers, 2021, 48(18): 1802019

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