选择性激光烧结铺粉辊设计与成型质量研究
|
摘要
在选择性激光烧结工艺中,铺粉效率以及粉末密度将直接影响烧结成型件的成型效率和质量。为了提高铺粉的质量,对铺粉装置进行了分析比较,提出了一种新的铺粉方案,首先,对铺粉装置的结构进行改进,并对改进后的铺粉装置进行运动学分析,建立了粉末颗粒在铺粉辊作用下的受力模型;然后,通过对该模型进行理论分析,得到影响铺粉质量的主要参数有铺粉辊的半径、粗糙度、自转的方向及刮板和铺粉辊的平移速度;最后,以改进铺粉装置之后的激光烧结设备为试验平台,进行试验研究,结果表明改进后的铺粉装置对成型件的成型质量有提升作用,并得出随着铺粉辊平移速度的增大,成型件的尺寸精度会先增大后减小。
In the selective laser sintering process,the powdering efficiency and the powder density will directly affect the forming efficiency and molding quality of the molded parts.In order to improve the quality of powder,the powder device was analyzed and compared,and a new powder distribution scheme was put forward.Firstly,the structure of the powdering device is improved,and the kinetic analysis of the modified powder coating device is carried out.the force model of the powder particles under the action of powder was established.Then,based on the theoretical analysis of the model,the main parameters affecting the quality of the powder are the radius,roughness,rotation direction of the laying powder and the translation speed of the scraper and the laying roll.Finally the laser sintering equipment after the improvement of the powder coating device is used to study the experiment design.The results show that the improved powder coating device has a better effect on the molding quality of the molded parts,and it is concluded that with the increase of the roll speed,the dimensional accuracy of the molded piece will increase first and then decrease.
In the selective laser sintering process,the powdering efficiency and the powder density will directly affect the forming efficiency and molding quality of the molded parts.In order to improve the quality of powder,the powder device was analyzed and compared,and a new powder distribution scheme was put forward.Firstly,the structure of the powdering device is improved,and the kinetic analysis of the modified powder coating device is carried out.the force model of the powder particles under the action of powder was established.Then,based on the theoretical analysis of the model,the main parameters affecting the quality of the powder are the radius,roughness,rotation direction of the laying powder and the translation speed of the scraper and the laying roll.Finally the laser sintering equipment after the improvement of the powder coating device is used to study the experiment design.The results show that the improved powder coating device has a better effect on the molding quality of the molded parts,and it is concluded that with the increase of the roll speed,the dimensional accuracy of the molded piece will increase first and then decrease.
引文
[1]郭艳玲,姜凯译,于志祥,等.选择性激光烧结木塑复合材料的制备工艺及成型机理[J].上海交通大学学报,2011,45(9):1327-1331.
[2]SINGH S,SHARMA V S,SACHDEVA A.Progress in selective laser sintering using metallic powders:a review[J].Materials Science and Technology,2016,32(8):760-772.
[3]李湘生,韩明,史玉升,等.SLS成形件的收缩模型和翘曲模型[J].中国机械工程,2001,12(8):887-889.
[4]吴伟辉,杨永强.选区激光熔化快速成形系统的关键技术[J].机械工程学报,2007,43(8):175-180.
[5]白俊生,唐亚新,余承业.激光烧结粉末快速成形铺粉辊筒运动参数的分析研究[J].航空精密制造技术,1997,33(4):15-17.
[6]李湘生,黄树槐,黎建军,等.激光选区烧结中铺粉过程分析[J].现代制造工程,2008(2):99-101.
[7]晏耐生,林峰,齐海波,等.电子束选区熔化技术中可控振动落粉铺粉系统的研究[J].中国机械工程,2010,21(19):2379-2382.
[8]郑军辉.尼龙粉末选择性激光烧结铺粉工艺数值模拟研究[D].湘潭:湘潭大学,2016.
[9]陈光霞,曾晓雁.选择性激光熔化激光快速成型铺粉装置设计[J].制造技术与机床,2010(3):57-59.
[10]刘野,党新安,杨立军.直接金属烧结快速成型机铺粉装置的改进及其运动分析[J].热加工工艺,2012,41(19):207-209.
[2]SINGH S,SHARMA V S,SACHDEVA A.Progress in selective laser sintering using metallic powders:a review[J].Materials Science and Technology,2016,32(8):760-772.
[3]李湘生,韩明,史玉升,等.SLS成形件的收缩模型和翘曲模型[J].中国机械工程,2001,12(8):887-889.
[4]吴伟辉,杨永强.选区激光熔化快速成形系统的关键技术[J].机械工程学报,2007,43(8):175-180.
[5]白俊生,唐亚新,余承业.激光烧结粉末快速成形铺粉辊筒运动参数的分析研究[J].航空精密制造技术,1997,33(4):15-17.
[6]李湘生,黄树槐,黎建军,等.激光选区烧结中铺粉过程分析[J].现代制造工程,2008(2):99-101.
[7]晏耐生,林峰,齐海波,等.电子束选区熔化技术中可控振动落粉铺粉系统的研究[J].中国机械工程,2010,21(19):2379-2382.
[8]郑军辉.尼龙粉末选择性激光烧结铺粉工艺数值模拟研究[D].湘潭:湘潭大学,2016.
[9]陈光霞,曾晓雁.选择性激光熔化激光快速成型铺粉装置设计[J].制造技术与机床,2010(3):57-59.
[10]刘野,党新安,杨立军.直接金属烧结快速成型机铺粉装置的改进及其运动分析[J].热加工工艺,2012,41(19):207-209.