摘要
针对蠕墨铸铁Ru380的高速车削,本文先采用单因素实验,研究切削三要素v、f、a_p对主切削力F_z的影响,随后采用正交实验分析了v、f、a_p对主切削力F_z影响的显著程度,进一步以正交实验所得数据,采用最小二乘法,给出了实验条件下主切削力预报模型F_z=5 655.877 6×a_p^(0.964)×f^(0.558)×v^(-0.268),并利用单因素实验数据进行验证。结果表明:v与F_z呈负相关;f和a_p与F_z呈正相关,其中a_p对F_z影响最大,其次为f,最小为v,F_z预报值与实测值相差在15%以内。最后,采用超景深显微镜、激光扫描显微镜、扫描电子显微镜(SEM)、能谱仪(EDS)等多种方法观察刀片磨损形式、分析刀片失效机理。结果表明:涂层硬质合金高速车削蠕墨铸铁时以粘结磨损为主、伴随着硬质点磨损和氧化磨损。在切削热的作用下,涂层内部热裂纹明显。
Aiming at the high speed turning of compacted graphite cast iron Ru380,the single-factor experiment was adopted in this article to research the influences of cutting parameters,i.e.,v,f and a_p,on the main cutting force F_z.In addition,the orthogonal experiment was adopted to further analyze the significance degrees of v,f and a_pon F_z.Based on the data acquired from the orthogonal experiment,the least square method was adopted to give the main cutting force forecasting model under the experimental conditions：F_z=5 655.877 6×a_p^（0.964）×f^（0.558）×v^（-0.268）.And the single-factor experiment data was utilized for verification.Results show that v is negatively correlated with F_z,but f and ap are positively correlated with F_z.a_（p ）has the largest influence,followed by f and v.The forecasting error of F_zis within 15%.Finally,various observation methods such as the super-depth-of-field microscope,the laser scanning microscope,the scanning electron microscope（SEM）and the energy dispersive spectrometer（EDS）were adopted to observe and analyze the wear pattern of inserts and the failure mechanism of inserts.Based on the results,the high speed turning of compacted graphite cast iron by the coated cemented carbide involves in mainly adhesive wear,accompanied with hard particle wear and oxidative wear.There are obvious hot cracks in the coating under the function of the cutting heat.
作者
倪高明
尹洪
张京
王许超
王羽中
Ni Gaoming;YinHong;Zhang Jing;Wang Xuchao;Wang Yuzhon(Zhuzhou Cemented Carbide Cutting Tools Co., LTD., Zhuzhou Hunan 412007, China)
出处
《硬质合金》
CAS
2017年第6期419-428,共10页
Cemented Carbides
基金
数控刀片精密加工装备研制及应用示范基金(2017ZX04020001)
子课题硬质合金数控刀片周边磨削的应用示范(2017ZX04020001-003)
关键词
高速车削
蠕墨铸铁
失效机理
涂层硬质合金刀片
high speed turning
compacted graphite iron
failure mechanism
coated cemented carbide interts
