锻压技术

基于STL模型的渐进成形支撑体的离散化设计

英文标题：Discrete design of incremental forming support-body based on STL model

作者：査光成贾俐俐史晓帆陆传凯周循黄凯

分类号：TG386

出版年,卷(期):页码：2015,40(12):155-159

摘要：

板料数控渐进成形中不同成形角位置的厚度不同，简单利用零件曲面或者等距偏置无法保证得到工具头与支撑体的合理间隙。利用渐进成形厚度减薄余弦定理δ=δ0cos θ，将加工件的表面离散为STL模型，提取STL各三角面片顶点坐标，x、y坐标保持不变，z坐标在Z轴负向偏置一个原始板材厚度，偏置后保持三角片拓扑关系不变，在此基础上生成支撑体表面模型。该方法依据零件模型不同成形角部位的厚度变化规律，可以得到合理的加工间隙。选择球冠型零件进行实验，获得了较好的加工件表面质量，对成形零件变形区厚度进行了测量，并对所得数据进行分析。

Because the part thickness of different forming angles in Incremental Sheet Forming(ISF) is various, a reasonable clearance between the forming tool and the support body cannot be determined by the part surface or the whole offset directly. According to the ISF thickness thinning cosine theorem δ=δ0 cosθ, the curved surface of the forming part was discretized into STL model, and then each triangle vertex coordinate value of STL model was read out, namely, x and y remained the same, and z was offset to an original plate thickness in the Z axis negative direction, but the topology relationship of the triangle was kept after vertex coordinate value offset. Therefore, based on the offset model, the curved surface of the support body was generated. According to the variation of the thickness of parts in different forming angles, a reasonable forming clearance between the forming tool and support body was obtained. The typical spherical parts were chosen to finish the forming experiment and then the ideal surface quality was obtained. The thickness value of the forming parts was measured and analyzed finally.

基金项目：

江苏省先进结构材料与应用技术重点实验室开放基金（ASMA201410）；南京工程学院创新基金项目（CKJB201304，CKJB201402;YKJ201311）；江苏省大学生实践创新项目（201511276041Y）

作者简介：查光成(1973-)，男，硕士，副教授

参考文献：

［1］朱虎, 姜在宽. 基于数控机床的金属板材无模单点渐进成形研究[J]. 锻压技术, 2007, 32(1):88-90. Zhu H, Jiang Z K. Sheet metal dieless incremental forming based on CNC machine tool[J]. Forging & Stamping Technology,2007,32(1):88-90.
［2］Attanasio A,Ceretti E, Giardini C, et al. Asymmetric two points incremental forming: improving surface quality and geometric accuracy by tool path optimization[J]. Journal of Materials Processing Technology, 2008,197(1-3): 59-67.
［3］周六如．基于数控渐进成形技术的方形盒成形工艺[J].锻压技术，2009，34(4)：65-68.Zhou L R. Forming process of square box based on NC incremental forming technology[J]. Forging & Stamping Technology, 2009，34(4)：65-68.
［4］Leszak E. Apparatus and process for incremental dieless forming [P]. US Patent: 3342051, 1967-9-19.
［5］Matsubara S. Incremental backward bulge forming of a sheet metal with a hemispherical head tool-a study of a numerical control forming system II[J]. Journal-Japan Society for Technology of Plasticity. 1994, 35: 1311-1312.
［6］Matsubara S. A computer numerically controlled dieless incremental forming of a sheet metal[J]. Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture,2001,215(7):959-967.
［7］高锦张.板料数控渐进成型技术[M].北京：机械工业出版社,2011. Gao J Z. Technology for Sheet NC Incremental Forming[M].Beijing:China Mechine Press, 2011.
［8］Micrai F, Ambrogio G, Filice L. Shape and dimensional accuracy in single point incremental forming state of the art and future trends[J]. Journal of Materials Processing Technology,2007,191(1/2/3):390-395.
［9］崔震,高霖,陆启建. 复杂钣金零件渐进成形方法[J].机械工程学报, 2007,43(12):235-239. Cui Z, Gao L, Lu Q J. Increment forming methods on complicated sheet part[J]. Chinese Journal of Mechanical Engineering, 2007,43(12):235-239.
［10］朱虎,张伟,扶建辉. 金属板材数控渐进成形支撑CAD模型自动生成[J].计算机集成制造系统, 2010, 16(4): 878-895. Zhu H, Zhang W, Fu J H. Automatic generation of support CAD model for sheet metal CNC incremental forming[J]. Computer Integrated Manufacturing Systems, 2010, 16(4): 878-895.
［11］Hirt G,Ames J,Bambach,et al. Forming strategies and process modeling for CNC incremental sheet forming[J].CIRP Annals-Manufacturing Technology,2004,53(1): 203-206.
［12］纪峰,陈荔,李占利.基于STL文件的模型及应用[J].长安大学学报:自然科学版, 2006,26(1):104-107. Ji F, Chen L, Li Z L. Model and application of stereo lithography (STL) files[J]. Journal of Changpan University:Natural Science Edition, 2006,26(1):104-107.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】