聚酰亚胺的冷风微量润滑辅助切削工艺

doi:10.16183/j.cnki.jsjtu.2021.173

摘要/Abstract

摘要：

研究了冷风微量润滑辅助的多孔聚酰亚胺材料切削加工性能,并探讨了切削加工工艺参数对多孔材料切削加工效果(切削力、表面加工质量及含油率)的影响规律.结果表明,相较于干切削和低温冷风切削,冷风微量润滑切削的切削温度及已加工表面粗糙度最低,多孔流道损伤最小.切削深度和进给量分别是对铣削力和表面粗糙度影响最大的因素.切屑毛边、撕裂等缺陷是导致表面粗糙度增大的主要因素.工件表面存在的拉丝、微裂纹、堆叠及微小碎屑附着等缺陷是材料含油率及输油率降低的根本原因.正交实验获得冷风微量润滑辅助条件下多孔聚酰亚胺材料最优加工参数:切削速度v_c=(85±5) mm/min,进给量f_z=(0.28±0.02) mm/r,切削深度a_p=(0.8±0.1) mm.冷风微量润滑切削技术可以实现多孔聚酰亚胺材料的低损伤加工,获得高含油率及高输油率的保持架产品.

关键词: 聚酰亚胺, 冷风微量润滑, 铣削, 低损伤加工工艺, 含油率

Abstract:

The cutting performance of the porous polyimide material assisted by cold air trace lubrication was investigated, and the influence law of cutting process parameters on the cutting effect (cutting force, surface finish quality, and oil content) of the porous material was explored. The results show that compared with dry cutting and low-temperature cold air cutting, the cutting temperature and the machined surface roughness of cold air micro-lubrication cutting are the lowest, and the damage to the porous runner is the smallest. The depth of cut and the feed volume are the factors that have the greatest influence on milling force and surface roughness, respectively. Defects such as chip burrs and tears are the main factors that lead to the increase in surface roughness. The existence of drawing, micro-crack, stacking, and tiny debris on the workpiece surface are the main causes for the decrease in the oil content and oil delivery rate of the material. The optimal machining parameters of the porous polyimide material in the orthogonal experiment with the aid of cold air trace lubrication are v_c=(100±2) mm/min, f_z=(0.3±0.01) mm/r, a_p=(0.8±0.1) mm (v_c is the cutting speed, f_z is the feeding rate, and a_p is the cutting depth). With the assist of the cryogenic minimal quantity lubrication technology, the low damage processing, high oil content, and high oil delivery rate of cage products can be obtained.

Key words: polyimide, cryogenic minimal quantity lubrication (CMQL), milling, low-damage processing technology, oil content

中图分类号:

TG506.3

曹拯, 雷学林, 张航, 蔡晓江. 聚酰亚胺的冷风微量润滑辅助切削工艺[J]. 上海交通大学学报, 2022, 56(6): 784-793.

CAO Zheng, LEI Xuelin, ZHANG Hang, CAI Xiaojiang. Cryogenic Minimal Quantity Lubrication Assisted Cutting Process for Polyimide Materials[J]. Journal of Shanghai Jiao Tong University, 2022, 56(6): 784-793.

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材料物理参数	工件	刀具
密度ρ/(kg·m^-3)	1400	14500
弹性模量E/GPa	3.61	640
泊松比ν	0.34	0.22
热传导率k/(W·m^-1·K^-1)	0.85	75.4

参数	取值
入口压力/MPa	0.69
耗气量/(L·min^-1)	420
制冷量/W	293
冷气温度/℃	-5~-10
耗油量/(mL·h^-1)	50~400
油桶容积/mL	600

组号	切削速度 v_c/(m·min^-1)	进给量 f_z/(mm·r^-1)	轴向深度 a_p/mm	径向深度 a_e/mm
1	75	0.10	0.5	4
2	75	0.25	1.0	4
3	75	0.40	1.5	4
4	100	0.10	1.0	4
5	100	0.25	1.5	4
6	100	0.40	0.5	4
7	125	0.10	1.5	4
8	125	0.25	0.5	4
9	125	0.40	1.0	4