第30卷 第5期摩擦学学报V o.l30 N o.5 2010年9月T ri b ology Sept,2010

冷风切削对高速切削难加工材料

刀具磨损的影响

苏 宇1*,何 宁2,李 亮2

(1.江苏科技大学机械工程学院,江苏镇江 212003; 2.南京航空航天大学机电学院,江苏南京 210016)

摘 要:基于复合制冷技术研制1种低温冷风/低温最小量润滑供给装置,使用T i A l N涂层硬质合金刀具进行干切削、最小量润滑(M QL)、低温冷风及低温最小量润滑(低温M QL)条件下镍基高温合金Inconel718的高速车削试验和淬硬钢A ISI D2的高速铣削试验,通过扫描电镜(SE M)和能谱分析(EDS)观察分析硬质合金刀具的磨损形态、磨损机理,研究低温冷风和低温MQ L对高速切削难加工材料刀具磨损的影响.结果表明:高速切削Inconel718和A ISI D2时,刀具磨损机理主要为磨料磨损、黏结磨损和扩散磨损;低温冷风和低温M QL可有效降低高速切削时的切削温度,进而防止刀具软化,减小磨料磨损和与温度相关的黏结磨损、扩散磨损,因而可大幅度地提高刀具的使用寿命.

关键词:低温冷风;低温最小量润滑;难加工材料;高速切削;磨损

中图分类号:TG506文献标志码:A文章编号:1004-0595(2010)05-0485-06

Effect of Refrigerated A ir Cutting on Tool wear i n H igh-s peed

Cutting of D ifficult-to-cutM aterials

SU Yu1*,H E N i n g2,L I L iang2

(1.Co llege of M echanical E ngineer i ng,J iang su Universit y of Science and T echnology,Zhenjiang212003,China

2.C olle ge of M echan ical and E lectr ical Engineering,

N anjing Uni versity of A eronautics and A stronautics,N anjing210016,China)

A bstrac t:A refr i gerated a i r/cryogenic m i n i m um quantity l ubricati on generator w as dev eloped based on a co m pos ite

re frigerati on m et hod.T i A l N coated carbi de too lwas used i n h i gh-speed t u rning of Incone l718nicke l-base superall oy and

h i gh-speed m illi ng o fA ISI D2hardened stee.l Expe ri m en ts were conducted under different cooli ng/l ubricati on cond iti ons,

.i e.dry cutting,m ini m u m quantity l ubr i cation(M QL),refri g era ted a ir,and cryogenic m i ni m u m quantity l ubricati on (cryogenic MQ L).SE M and ED S were used to ana lyze wear m orpholog i es and m echan i s m of cemented carbide too ls.T hus

e ffect o

f refri ge ra ted air and cryogenic M QL on t oo l wear w as i nvesti

g ated i n

h

i gh-speed cutti ng o f diffi cult-to-cut

m ater i a ls.T he results sho w ed t hat the ma i n too l wear m echan is m was abrasive w ear,adhesive w ea r and diffus i on wear i n

h i gh-speed cutti ng of d iffi cult-to-cut m ater i a ls.A pplica ti on of refr i gerated a ir and cryogenic M QL i n the h i gh-speed

cutting o f difficu lt-to-cu t m ater i a ls reduced the cutti ng te m perat ure effec tive l y,wh ich avo i ded the i n tenerate o f cutti ng tools,and reduced abrasive w ear and ther m all y re lated w ear such as adhesive wear and diff usion w ear.T herefo re, re frigerated a ir and cryogenic MQ L enhanced too l life re m arkably.

K ey words:refri g era ted a ir,cryogen i c m ini m u m quantit y l ubr ica ti on,d ifficu lt-to-cu t ma teria l s,h i gh-speed cutti ng, wea r

R ece i ved13January2010,rev ised24M ay2010,accepted15June2010,ava ilab le on li ne28Septe m ber2010.

*Correspond i ng author.T e:l+86-137********,E-m a i:l suyuli u@http://www.doczj.com/doc/8a3f03f59e31433239689354.html