基于反投影带垫板的网孔板数控渐进成形
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摘要
针对成形工具头直接对网孔板进行挤压存在的问题,提出了一种基于垫板的网孔板数控渐进成形方法。通过在网孔板上放置一张垫板,使成形工具头间接挤压网孔板,消除成形工具头和网孔板之间的摩擦力,进而避免网孔板产生划痕或破裂。此外,针对恒定层间距等高线成形轨迹不太适合网孔板平坦区域成形的问题,提出了基于反投影的等高线轨迹生成方法。在等高线轨迹比较稀疏的平坦区域,利用反投影方法插入等高线,使该区域的等高线轨迹稠密化,从而使该区域也能被均匀挤压。成形实验结果表明,基于反投影带垫板的网孔板数控渐进成形方法有助于提高网孔板的成形质量。
For the exist problem of extruding the mesh plate directly by forming tool head,the CNC incremental forming mesh plate based on pad plate was proposed. Then,the mesh plate was indirectly extruded by forming tool head through placing a pad-plate on mesh plate,and the scratches or rupture of mesh plate was avoided by eliminating the friction between forming tool head and mesh plate. In addition,aiming at the problem that the contour trajectory with constant layer distance was not suitable for the formation of flat area for mesh plate,the method of contour trajectory based on back-projection was proposed. Furthermore,the contour lines were inserted in a flat area by back-projection,where the contour trajectories were densely so that the area could be extrude evenly. The forming experimental results show that the CNC incremental forming method of mesh plate with pad plate based on back-projection can improve forming quality of mesh plate.
For the exist problem of extruding the mesh plate directly by forming tool head,the CNC incremental forming mesh plate based on pad plate was proposed. Then,the mesh plate was indirectly extruded by forming tool head through placing a pad-plate on mesh plate,and the scratches or rupture of mesh plate was avoided by eliminating the friction between forming tool head and mesh plate. In addition,aiming at the problem that the contour trajectory with constant layer distance was not suitable for the formation of flat area for mesh plate,the method of contour trajectory based on back-projection was proposed. Furthermore,the contour lines were inserted in a flat area by back-projection,where the contour trajectories were densely so that the area could be extrude evenly. The forming experimental results show that the CNC incremental forming method of mesh plate with pad plate based on back-projection can improve forming quality of mesh plate.
引文
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[3] Liu Z B,Daniel W J T,Li Y L,et al. Multi-pass deformation de-sign for incremental sheet forming:Analytical modeling,finite ele-ment analysis and experimental validation[J]. Journal of Materi-als Processing Technology,2014,214(3):620-634.
[4]朱虎,杨晓光.五轴数控渐进成形干涉检测与修正研究[J].机械工程学报,2014,50(7):168-175.Zhu H,Yang X G. A study on the interference detection and cor-rection in 5-axis CNC incremental forming[J]. Journal of Me-chanical Engineering,2014,50(7):168-175.
[5]谭富星,李明哲,蔡中义.带孔网板数字化多点成形过程中拉裂缺陷的有限元分析[J].机械工程学报,2008,44(6):120-124.Tan F X,Li M Z,Cai Z Y. Finite element analysis of fractures inthe process of digital multi-point forming for retiary sheet metal[J]. Journal of Mechanical Engineering,2008,44(6):120-124.
[6] Chen J J,Liu W,Li M Z,et al. Digital manufacture of titaniumprosthesis for cranioplasty[J]. International Journal of AdvancedManufacturing Technology,2006,27(11-12):1148-1152.
[7] Moiduddin K,Darwish S,Al-Ahmari A,et al. Structural and me-chanical characterization of custom design cranial implant createdusing additive manufacturing[J]. Electronic Journal of Biotech-nology,2017,29(6),22-31.
[8]孙卫和,熊洪淼,韩洪强,等.带孔杯形件成形变形趋向性实验研究[J].锻压技术,2002,27(5):19-21.Sun W H,Xiong H M,Han H Q,et al. Experimental study onforming deformation tendency of cup shaped parts with holes[J].Forging&Stamping Technology,2002,27(5):19-21.
[9]谭利广,肖小亭,温华典,等.带预制孔筒形件拉深成形金属流动规律的研究[J].锻压技术,2011,36(6):114-119.Tan L G,Xiao X T,Wen H D,et al. Research on the law of met-al flow in deep drawing forming with prefabricated hole cylinder[J]. Forging&Stamping Technology,2011,36(6):114-119.
[10]张淑芹,王进,史继臣,等.网孔板渐进成形性能[J].锻压技术,2016,41(8):48-52.Zhang S Q,Wang J,Shi J C,et al. Hole plate incremental form-ing performance[J]. Forging&Stamping Technology,2016,41(8):48-52.
[11] Tan F X,Li M Z,Cai Z Y,et al. Numerical simulation of wrink-ling in multi-point forming process of titanium alloy retiary sheet[J]. Journal of Xi'an Jiaotong University,2007,41(9):1026-1030.
[12] Gttmann A,Korinth M,Schfer V,et al. Manufacturing of indi-vidualized cranial implants using two point incremental sheet metalforming[J]. Future Trends in Production Engineering,2012,23(5):1386-1387.
[13] Rauch M,Hascoet J Y,Hamann J C,et al. A new approach fortoolpath programming in incremental sheet forming[J]. Interna-tional Journal of Material Forming,2008,1(1):1191-1194.
[14] Zhu H,Lin W W,Bai J L. An overview of the sheet metal CNCincremental forming toolpath generation[J]. Advanced MaterialsResearch,2012,503-504:35-39.