摘要
通过数控加工方法制备铸造用冷冻砂型是实现数字化冷冻砂型绿色铸造的重要基础。开展了冷冻砂型在不同目数和含水量下的数控加工稳健参数优化研究,获得对尺寸精度影响波动最小的切削加工工艺参数组合,当切削速度为188 m/min、进给速度为120 mm/s、切削深度为3 mm和切削宽度为8 mm时,数控加工冷冻砂型的尺寸精度较稳定。开展冷冻砂型多参数耦合排砂工艺参数优化研究,以排砂率为指标,在不同型腔三维尺寸条件下分析流量、靶距、俯角和口径对排砂效果的影响规律,优化出较优排砂工艺参数组合,流量为30 L/min、靶距为45 mm、俯角为65°、口径为2 mm,排砂效果较好。耦合冷冻砂型力学性能与排砂要求,优化得到造型参数为100目原砂与4%(质量分数)含水量。通过试验优化得到完整的冷冻砂型数控加工排砂工艺参数窗口,实现冷冻砂型数控加工的高精高效成形。
The preparation of frozen sand molds for casting by CNC machining methods is an important basis for the realization of digital frozen sand green casting.This paper carries out a study on the optimization of robust parameters for CNC machining of frozen sand profiles at different mesh sizes and different water contents,to obtain the combination of cutting process parameters that has the least impact on dimensional accuracy.The dimensional accuracy of CNC machined frozen sand molds is more stable when the cutting speed is 188 m/min,the feed rate is 120 mm/s,the depth of cut is 3 mm and the cutting width is 8 mm.Research on optimization of parameters of multi-parameter coupled sand removal process for frozen sand type is carried out.Taking the sand discharge rate as an index,the influence laws of flow rate,target distance,pitch angle and caliber on the sand discharge effect under conditions of different cavity three-dimensional size are analyzed,and the combination of sand discharge process parameters is optimized.The flow rate is 30 L/min,target distance is 45 mm,pitch angle is 65°,and caliber is 2 mm.Coupled with the mechanical properties of frozen sand mold and sand discharge requirements,the optimized molding parameters are 100 mesh raw sand and 4%(mass fraction)water content.Through the test optimization,a complete frozen sand CNC machining sand discharge process parameter window can be obtained,thus achieving high precision and high efficiency of frozen sand CNC machining forming.
作者
刘亲将
单忠德
杨浩秦
闫丹丹
梁校
LIU Qinjiang;SHAN Zhongde;YANG Haoqin;YAN Dandan;LIANG Xiao(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;College of Materials Science and Technology,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China)
出处
《南京航空航天大学学报(自然科学版)》
北大核心
2025年第3期535-546,共12页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家重点研发计划(2021YFB3401200)
装备预研专用技术项目(30104040302)
江苏省基础研究计划(自然科学基金)青年基金(BK20230885)。
关键词
冷冻砂型
排砂工艺
正交试验
参数优化
排砂效果
frozen sand mold
sand discharge process
orthogonal test
parameter optimization
sand discharge effect
作者简介
通信作者:单忠德,男,研究员,博士生导师,院士,E-mail:shanzd@nuaa.edu.cn;通信作者:杨浩秦,男,博士,E-mail:yang-hao⁃qin@nuaa.edu.cn。
