摘要
目的针对CFRP开展二氧化碳低温冷却和干式条件下的PCD刀具制孔试验研究,从而提高CFRP材料的切削性能、制孔精度及制孔质量。方法在传统钻孔和低温冷却条件下,采用常规和织构PCD刀具开展制孔试验,分析不同切削参数下的轴向推力、总切削力、入口直径和相对误差、表面黏结、孔壁形貌及缺陷的差异性。结果在干式和低温冷却条件下,CFRP钻入过程产生的轴向推力和总切削力均随着进给速度的增大而不断增大;在试验条件下,当进给速度增大时,PCD刀具+干式、PCD刀具+低温及PCD织构刀具+低温3种方式下获得的入口直径相对误差范围分别为0.29%~0.42%、0.57%~1.15%、0.38%~0.89%;与干式加工相比,低温冷却有效抑制了刀具切屑黏结;总体来说,在低温冷却下,孔壁表面有明显的纤维断裂,形成较多的纤维断口坑、微裂纹,树脂表面涂覆均匀性较差。结论在CFRP钻孔过程中,相对于干式钻孔,在相同切削参数下,低温冷却下可以获得更大的切削力;与低温冷却相比,采用干式钻孔能够提高入口直径尺寸的制孔精度,有效提高抗黏结效果;总体来说,相同切削参数下,干式制孔获得的孔壁表面更加平整和均匀。
Experimental studies on hole-making with PCD tools under carbon dioxide cryogenic cooling and dry conditions were carried out for carbon fiber reinforced polymer(CFRP)to improve the cutting performance,hole-making accuracy and hole-making quality of CFRP materials.Under conventional and cryogenic cooling-assisted drilling conditions,conventional polycrystalline diamond tools and surface textured tools were used to carry out experimental studies on hole-making of CFRP materials,and to analyze the differences in thrust force,total cutting force,entrance diameter and relative error,tool surface adhesion,hole wall morphology and defects with different cutting parameters.Under dry and cryogenic cooling conditions,both the thrust force and the total cutting force generated by the drilling process of the composite increased continuously with the increase of the feed rate.When the feed rate increased,the relative error range of the entrance diameters obtained by the PCD tool with dry drilling,the PCD tool with cryogenic cooling and the textured PCD tool with cryogenic cooling were 0.29%-0.42%,0.57%-1.15%and 0.38%-0.89%respectively under the test conditions.Compared with dry machining,there was almost no chips adhesion on the rake face of the tool under cryogenic cooling conditions.In general,it could be observed that there were some obvious fiber breakage,more fiber fracture pits,and the phenomenon of micro-cracks and uneven matrix smearing on the surface of inner hole wall under cryogenic cooling conditions.During the process of drilling CFRP,the increase in feed rate increased the cutting layer area,which lead to a constant increase in thrust and total cutting forces.It was found that the bigger thrust and total cutting forces could be obtained under cryogenic cooling conditions compared with the dry drilling at the same cutting parameters.Under the test conditions,compared with the cryogenic cooling method,the use of dry drilling could improve the hole-making accuracy of the entrance diameter size,while the cryogenic cooling way could effectively reduce the chips adhesion on the rake face of the tool and improve the anti-adhesion effect.It was found that a flatter and more uniform surface of the hole wall could be obtained by the dry hole-making at the same cutting parameters,and the inner hole wall had the poor poorer machining defects under cryogenic cooling conditions as a whole.It is of great research significance to carry out efficient and low-damage hole-making technology of the composites to reduce tool wear,improve hole-making efficiency,hole-making accuracy and realize low-defect machining.Existing research on the cutting tool development and process innovation in machining of the carbon fiber reinforced polymer is still in the experimental exploration stage,as a result,it is necessary to carry out deeper research and explore how to achieve high performance hole-making through the comprehensive innovation involving the tool design,cutting process and cooling conditions and other aspects,which can contribute to providing a new idea and a new way for high-performance key machining process technology of the hole-making of the high-end composite components.
作者
苏永生
王诚
朱益洋
阮芳涛
刘剑
SU Yongsheng;WANG Cheng;ZHU Yiyang;RUAN Fangtao;LIU Jian(School of Mechanical and Automotive Engineering,Anhui Polytechnic University,Anhui Wuhu 241000,China;School of Textile and Garment,Anhui Polytechnic University,Anhui Wuhu 241000,China;Wuhu General Aviation Industry Technology Research Institute of China Electronics Corporation,Anhui Wuhu 241100,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第14期157-163,共7页
Surface Technology
基金
安徽省重点研究与开发计划项目(2022a05020006)
安徽省高等学校科学研究重大项目(2022AH040134)
安徽工程大学中青年拔尖人才项目
安徽工程大学研究生质量工程项目(2023yzl015)
安徽工程大学本科教学质量提升计划项目(2022szyzk66,2023xmskk12)。
作者简介
通信作者:苏永生。
