FORMATION AND MODELING OF VERTICAL OUTSIDE WALL OF COMPOENTS INCLINING INWARD IN LASER SOLID FORMING

doi:10.11900/0412.1961.2014.00631

Acta Metall Sin

2015, Vol. 51

Issue (6): 753-761 DOI: 10.11900/0412.1961.2014.00631

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FORMATION AND MODELING OF VERTICAL OUTSIDE WALL OF COMPOENTS INCLINING INWARD IN LASER SOLID FORMING

Menghua SONG,Xin LIN,Fenggang LIU,Haiou YANG,Weidong HUANG(

)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

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Menghua SONG, Xin LIN, Fenggang LIU, Haiou YANG, Weidong HUANG. FORMATION AND MODELING OF VERTICAL OUTSIDE WALL OF COMPOENTS INCLINING INWARD IN LASER SOLID FORMING. Acta Metall Sin, 2015, 51(6): 753-761.

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Abstract

The vertical outside wall is prone to incline inward in laser solid forming, which will deteriorate the dimension precision and processing stability. For solving this problem, samples with different amount of deposited layers were prepared and the variation of boundary single-track clad shape and formation of vertical outside wall inclining inward were investigated. Based on the method of constructing cross-section profile of the single-track clad by height of powders accumulated in molten pool, an analytical model was developed to describe the evolution of vertical outside wall during multilayer superimposition. A series of vertical outside walls under different width/height ratios and critical defocus distance were constructed with this model to investigate their influence. Results indicate that the deposited single-track clad will influence the formation of single-track clad under depositing. Due to the arc-like cross-section profile of single-track clad, the molten pool will shrink inward, which leads the outer edge of boundary single-track clad to shrink inward then the vertical outside wall to incline inward. However, this incline will decrease with the increase of deposited height. For the initial single-track clad with fixed width, decreasing critical defocus distance can decrease the inward incline but increase the offset from the preset dimension. The width/height ratio almost has no effect on outside wall.

Key words: laser solid forming vertical outside wall inward incline analytical model

Fund: Supported by National Natural Science Foundation of China (No.51323008), National Basic Research Program of China (No.2011CB610402), High Technology Research and Development Program of China (No.2013AA031103) and Fund of State Key Laboratory of Solidification Processing in NWPU (No.91-QZ-2014)

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	Menghua SONG
	Xin LIN
	Fenggang LIU
	Haiou YANG
	Weidong HUANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00631 OR https://www.ams.org.cn/EN/Y2015/V51/I6/753

Fig.1 Schematic of destination geometry of sample prepared by laser solid forming and vertical outside wall

Fig.2 Outside wall profiles of laser solid formed 2Cr13 stainless steel with single-track clad (a), 7 layers (b), 15 layers (c) and 36 layers (d)

Fig.3 Cross-section profiles of top boundary single-track clad of laser solid formed 2Cr13 stainless steel with different layers (The vertical dotted lines indicate relative offset of outside edge of top boundary clad from the initial boundary clad)

Fig.4 Schematic of the influence of deposited boundary single-track clad on depositing clad during multilayer superimposition

Fig.5 Schematic of coordinate system and laser beam shape (b—half divergent angle, H—distance of the maximum laser spot from initial substrate surface)

Table 1 The parameters for reconstructing outside wall profiles

Fig.6 The constructed outside wall with H=0.3, R=3 (a), H=0.3, R=5 (b), H=0.3, R=7 (c), H=0.5, R=3 (d), H=0.5, R=5 (e), H=0.5, R=7 (f), H=0.9, R=3 (g), H=0.9, R=5 (h) and H=0.9, R=7 (i)

Fig.7 Schematic definition of the angle between two adjacent layers a and dimension offset Δf

Fig.8 Variations of angle between adjacent layers with the cladding layer number (a) and deposition height (b)

Fig.9 Variations of dimension offset (Δf) with cladding layer number (a) and deposition height (b)

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