磨粒有序多孔立方氮化硼砂轮高效磨削高温合金烧伤研究
|
摘要
针对高温合金高效磨削过程中存在磨削烧伤问题,基于氧化铝空心球造孔与高温钎焊技术,研制了多层磨粒有序排布的多孔立方氮化硼(Cubic Boron Nitride,简称CBN)砂轮,开展了高效磨削GH4169镍基高温合金试验研究,分析了缓进给磨削中工件表面突发性烧伤特征,并提出采用添加石墨导流块来抑制工件烧伤策略。研究结果表明:添加石墨块导流后,缓进深切磨削砂轮最大材料去除率可提高3倍以上。当切深为0.2mm时,高速磨削时砂轮最大材料去除率可达20mm3/(mm·s)。当材料去除率为2mm3/(mm·s)时,随着磨削速度增大,磨削温度先下降后上升,当vs=80m/s时磨削温度最低。越过临界速度100m/s,磨削温度则呈下降趋势。
Porous CBN wheel with multilayer defined grain pattern was developed based on pore-forming effect of alumina bubbles and brazing technology.High-efficiency grinding experiments were carried out on a typical nickel-based superalloy GH4169,and the grinding burn on the ground surface was studied.A strategy to control the grinding burn by clapping guiding graphite blocks around the workpiece was proposed,which would improve the cooling effect in the grinding zone.The material removal rate was at least 3times higher by clapping graphite blocks in deep grinding,and up to 20mm3/(mm爛s)in high speed grinding at the cutting depth of 0.2mm.In deep grinding with material removal rate 2mm3/(mm爛s),as grinding speed increased,the grinding temperature firstly decreased down to the lowest when vswas 80m/s,then increased to the top,at the critical speed of 100m/s,and afterwards it decreased again.
Porous CBN wheel with multilayer defined grain pattern was developed based on pore-forming effect of alumina bubbles and brazing technology.High-efficiency grinding experiments were carried out on a typical nickel-based superalloy GH4169,and the grinding burn on the ground surface was studied.A strategy to control the grinding burn by clapping guiding graphite blocks around the workpiece was proposed,which would improve the cooling effect in the grinding zone.The material removal rate was at least 3times higher by clapping graphite blocks in deep grinding,and up to 20mm3/(mm爛s)in high speed grinding at the cutting depth of 0.2mm.In deep grinding with material removal rate 2mm3/(mm爛s),as grinding speed increased,the grinding temperature firstly decreased down to the lowest when vswas 80m/s,then increased to the top,at the critical speed of 100m/s,and afterwards it decreased again.
引文
[1]任敬心,康仁科,史兴宽.难加工材料的磨削[M].北京:国防工业出版社,1999.REN Jingxin,KANG Renke,SHI Xingkuan.Grinding of difficult-to-cut materials[M].Beijing:National Defense Industry Press,1999.
[2]ANDREW C,HOWES T,PEARCE T.Creep feed grinding[M].New York:Industrial Press,1985.
[3]徐鸿钧,傅玉灿,孙方宏,等.高效磨削时弧区热作用机理与强化弧区换热的基础研究[J].中国科学E辑,2002,32(3):261–272.XU Hongjun,FU Yucan,SUN Fanghong,et al.Fundamental studies on enhancing heat transfer in contact zone during high efficiency grinding[J].Science in China(Series E),2002,32(3):261–272.
[4]赫青山,傅玉灿,陈佳佳,等.热管砂轮磨削高温合金GH4169实验研究[J].金刚石与磨料磨具工程,2013,33(4):5–9.HE Qingshan,FU Yucan,CHEN Jiajia,et al.Study on heat pipe grinding wheels when grinding superalloy GH4169[J].Diamond&Abrasives Engineering,2013,33(4):5–9.
[5]丁文锋.镍基高温合金高效磨削用单层钎焊立方氮化硼砂轮的研制[D].南京:南京航空航天大学,2006.DING Wenfeng.Research and development of monolayer brazed CBN wheels for high efficiency grinding nickel-based superalloy[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2006.
[6]HAUSUDA Y,HANDA A,KOBORI Y,et al.Grinding of superalloys using metal-bonded CBN wheel[J].Key Engineering Materials,2012,523–524(1):143–148.
[7]WEBSTER J A,CUI C,MINDEK R B,et al.Grinding fluid application system design[J].CIRP Annals–Manufacturing Technology,1995,44(1):333–338.
[8]TANAKA T.New development of metal bonded diamond wheel with pore by the growth of bonding bridge[J].Japan Social Precision Engineering,1992,26(1):27–32.
[9]丁文锋,徐九华,陈珍珍,等.磨料与空心球三维协同有序排布装置及其方法[P].中国专利:201310321169.2,2013–07–29.DING Wenfeng,XU Jiuhua,CHEN Zhenzhen,et al[P].China Patent:201310321169.2,2013–07–29.
[10]张志伟,徐九华,傅玉灿,等.陶瓷CBN砂轮高效磨削的弧区冷却液动压力研究[J].金刚石与磨料磨具工程,2013,33(6):12–16.ZHANG Zhiwei,XU Jiuhua,FU Yucan,et al.Study on the hydrodynamic fluid pressure within grinding zone with vitrified CBN wheel[J].Diamond&Abrasives Engineering,2013,33(6):12–16.
[11]TAWAKOLI T.BARRETT C G.High efficiency deep grinding[M].London:Mechanical Engineering Publications,1993.
[2]ANDREW C,HOWES T,PEARCE T.Creep feed grinding[M].New York:Industrial Press,1985.
[3]徐鸿钧,傅玉灿,孙方宏,等.高效磨削时弧区热作用机理与强化弧区换热的基础研究[J].中国科学E辑,2002,32(3):261–272.XU Hongjun,FU Yucan,SUN Fanghong,et al.Fundamental studies on enhancing heat transfer in contact zone during high efficiency grinding[J].Science in China(Series E),2002,32(3):261–272.
[4]赫青山,傅玉灿,陈佳佳,等.热管砂轮磨削高温合金GH4169实验研究[J].金刚石与磨料磨具工程,2013,33(4):5–9.HE Qingshan,FU Yucan,CHEN Jiajia,et al.Study on heat pipe grinding wheels when grinding superalloy GH4169[J].Diamond&Abrasives Engineering,2013,33(4):5–9.
[5]丁文锋.镍基高温合金高效磨削用单层钎焊立方氮化硼砂轮的研制[D].南京:南京航空航天大学,2006.DING Wenfeng.Research and development of monolayer brazed CBN wheels for high efficiency grinding nickel-based superalloy[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2006.
[6]HAUSUDA Y,HANDA A,KOBORI Y,et al.Grinding of superalloys using metal-bonded CBN wheel[J].Key Engineering Materials,2012,523–524(1):143–148.
[7]WEBSTER J A,CUI C,MINDEK R B,et al.Grinding fluid application system design[J].CIRP Annals–Manufacturing Technology,1995,44(1):333–338.
[8]TANAKA T.New development of metal bonded diamond wheel with pore by the growth of bonding bridge[J].Japan Social Precision Engineering,1992,26(1):27–32.
[9]丁文锋,徐九华,陈珍珍,等.磨料与空心球三维协同有序排布装置及其方法[P].中国专利:201310321169.2,2013–07–29.DING Wenfeng,XU Jiuhua,CHEN Zhenzhen,et al[P].China Patent:201310321169.2,2013–07–29.
[10]张志伟,徐九华,傅玉灿,等.陶瓷CBN砂轮高效磨削的弧区冷却液动压力研究[J].金刚石与磨料磨具工程,2013,33(6):12–16.ZHANG Zhiwei,XU Jiuhua,FU Yucan,et al.Study on the hydrodynamic fluid pressure within grinding zone with vitrified CBN wheel[J].Diamond&Abrasives Engineering,2013,33(6):12–16.
[11]TAWAKOLI T.BARRETT C G.High efficiency deep grinding[M].London:Mechanical Engineering Publications,1993.