特征结构对SLS成形件尺寸精度的影响
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摘要
选择性激光烧结(SLS)技术由于能够成形复杂熔模,因此在航空复杂铸件成形方面,其成形尺寸精度尤为关键。为了研究特征结构对其SLS成形尺寸精度的影响,以机匣零件中常存在的薄壁、圆孔和法兰特征结构作为研究对象。首先,以聚苯乙烯为材料,采用SLS技术制备试样,并采用三维扫描技术获得三组试样的变形结果;其次,在对扫描结果与原始几何模型进行对比的基础上,采用尺寸偏差对比和圆柱度对比等方法分析了3种结构对尺寸精度的影响。结果表明,圆孔结构使烧结件径向收缩不均匀,降低其尺寸精度;而法兰结构可限制烧结件变形,提高其尺寸精度。
Selective laser sintering(SLS)technology has been widely used in precision casting due to its ability to form complex investment patterns especially in the formation of complex parts of aerospace.The forming of investment pattern is an important part of investment casting,and the forming dimensional accuracy is especially important.In order to understand effect of the structure on the forming dimensional accuracy of SLS,the thin wall,circular hole and flange structure were analyzed in the investment castings.Firstly,polystyrene samples were prepared by SLS technology,and three-dimensional scanning techniques were used to obtain the deformation results of three sets of samples.Secondly,the scanning results were compared with the original geometric model,and the size deviation comparison and cylindricity comparison mean were used to analyze influence of structure on dimensional accuracy.It is concluded that the circular hole structure can change the radial contraction and reduce the dimensional accuracy.The flange structure can restrict the deformation of sintered parts and improve the dimension accuracy.
Selective laser sintering(SLS)technology has been widely used in precision casting due to its ability to form complex investment patterns especially in the formation of complex parts of aerospace.The forming of investment pattern is an important part of investment casting,and the forming dimensional accuracy is especially important.In order to understand effect of the structure on the forming dimensional accuracy of SLS,the thin wall,circular hole and flange structure were analyzed in the investment castings.Firstly,polystyrene samples were prepared by SLS technology,and three-dimensional scanning techniques were used to obtain the deformation results of three sets of samples.Secondly,the scanning results were compared with the original geometric model,and the size deviation comparison and cylindricity comparison mean were used to analyze influence of structure on dimensional accuracy.It is concluded that the circular hole structure can change the radial contraction and reduce the dimensional accuracy.The flange structure can restrict the deformation of sintered parts and improve the dimension accuracy.
引文
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[2]赵剑峰,李悦,张建华,等.基于SLS技术的金属零件快速制造研究[J].特种铸造及有色合金,2000(5):9-10.
[3]董渠,王传洋,钱秋波.选择性激光烧结聚苯乙烯制件尺寸精度影响因素研究[J].塑料工业,2010,38(S0):93-95.
[4]李广慧.选择性激光烧结快速成型制件精度的研究[D].哈尔滨:哈尔滨理工大学,2003.
[5]庞国星.粉末激光烧结快速成型工艺及后处理涂层研究[D].北京:中国矿业大学,2009.
[6]郑卫东,樊振中,王端志,等.3D打印蜡模快速制造ZL114A铸件凝固收缩率研究[J].特种铸造及有色合金,2017,37(6):642-645.
[7]DOTCHEV K D,DIMOV SS,PHAM D T,et al.Accuracy issues in rapid manufacturing CastFromTMpatterns[J].Engineering Manufacture,2007,221(1):53-67.
[8]谢小林,肖慧萍,范红青,等.降低聚苯乙烯粉末激光烧结收缩率的研究[J].南昌航空工业学院学报,2004,18(3):69-71.
[9]YANG J,SHI Y,SHEN Q,et al.Selective laser sintering of HIPS and investment casting technology[J].Journal of Materials processing technology,2009,209(4):1 901-1 908.
[10]韩昌仁,周铁涛,柴增田,等.熔模精密铸造蜡模充型过程的数值模拟[J].特种铸造及有色合金,2001(3):38-39.
[11]赵保军,施法中,冯涛,等.选择性激光烧结聚苯乙烯粉末成形温度场的数值模拟研究[J].激光杂志,2002,23(2):66-69.
[12]NICOLAS M Y S,VERBERCKMOES A,CARDON L.Processing of syndiotactic polystyrene to microspheres for part manufacturing through selective laser sintering[J].Polymers,2016,8(12):383-398.