1、475Vol.47No.5 20115535539ACTA METALLURGICA SINICA May.2011pp.535539111,211111,1000842,110004,.,.,.,TF777.1A04121961(201105053505 THREE DIMENSIONAL DYNAMICAL MEASUREMENT OF DISTORTION OF HEA VY STEEL CASTINGSDURING HEAT TREATMENT PROCESSKANG Jinwu1,NIE Gang1,YU Hailiang1,2,LONG Haimin1,HAO Xiaokun1,

2、HUANG Tianyou1,HU Yongyi11Department of Mechanical Engineering,Key Laboratory for Advanced Materials Processing Technology,TsinghuaUniversity,Beijing1000842State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang110004Correspondent:YU Hailiang,Tel:(01062784537,E-mail:yuhailian

3、gSupported by National Key Technology R&D Program(No.2007BAF02B07and National Science and Technology Major Project(No.2009ZX04014082Manuscript received20101116,in revised form20110114ABSTRACT At the forced air cooling stage in normalizing process of heavy steel castings,the nonuniform cooling mi

4、ght result in thermal and phase transformation stresses,which might cause the distortion,especially for the heavy yet thin blade castings.Dynamical measurement of the distortion of castings during heat treatment process will be signicant for understanding the mechanism of dis-tortion and then taking

5、 the control measures in productions.In this paper,a novel measuring method,xed direction method,was proposed,which could threedimensionally and dynamically measure the distortion of castings without index points at high temperature,and the corresponding analysis method was established.The method wa

6、s employed to measure the distortion of a hydro blade casting at the forced cooling stage in normalizing process,and the dynamical distortion behavior in three dimensions of the blade casting was obtained.And the measurement error of blade casting was analyzed.The results show that under the conditi

7、ons of no index points and high temperature,the threedimensional distortion of castings could be dynamically measured through thexed direction method.*2007BAF02B072009ZX04014082:20101116,:20110104:,1970,DOI:10.3724/SP.J.1037.2010.0061753647 KEY WORDS heavy steel casting,heat treatment,distortion,dyn

8、amical measurement,no index point,xed direction method,.,1,.,.,2.,3,4.,5,6.,. ,.,7,.8,.9,.10,.11,.,.,.,.,.,.,.,.1,.,.,.1.,P i,(i,i,i,i,i(i=1,2······n.P ii,1,t i,1,(i,1,i,i.,.P i j(j=1,2······m,(i,i,(i,j,i,i,t i,j.,.,., .1Fig.1Illustration o

9、f the measuring method22,t i,j j,1,i A(i,j,5:537 2Fig.2Schematic of measurement of the distortion of cast-ingi,i;j+1,2, i B(i,j+1,i,i.N A,B2,1B1B ,A12A .(1A C(i+1,j,i+1,i+1D(i+2,j,i+2,i+2,A,C D.,A,C D(i,j cosi cosi,i,j cosi sini,i,j sini, (i+1,j cosi+1cosi+1,i+1,j cosi+1sini+1,i+1,j-sini+1(i+2,j cos

10、i+2cosi+2,i+2,j cosi+2sin-i+2,i+2,j sini+2.A,C D3AN(u,v,w.,AA2,1AAA |AA |,|AA | AB|·N.d i,j= |AA |i,.3ZG0Cr13Ni4Mo.1020,10m/s.4.5m.3.,.,4a3P1,P2P3,4b.,P1,;P2,;P3P1.,.X,12.,.,;,;,13,14,.,.4,.:(1.=1mm,1 .(2.,1 .(3.5.5,O,(L,H.=2.L H,(.=+H(1/cos(+1/cos,=1mm,=2 .,(,.16m(1216m,H L.L=H tg,H L,H.6=16m,

11、H.,H.,H>6m.H=6m,53847 3Fig.3Distortion of the blade casting during forced air cooling and the local photo 4Fig.4Realtime distortion behavior of some typical points of blade casting during forced air cooling(athe measured points induding P1,P2and P3on a blade casting(bdistortion at the points P1,P

12、2and P35:539 5Fig.5Measurement error model6HFig.6Inuence of H on(=16m=1.38mm,<1.38mm.24,.50mm,2m,2 2.5%,1.25mm., 2.63mm,1.38mm.,.,H,.5(1,.(2.(3,.1Yu H L,Kang J W,Huang T Y.Front Mater Sci,2010;4:3322Huang T Y,Liu X G,Kang J W,Shen H F,Liu B C.Foundry,2007;56:899(,.,2007;56:899 3Liu B C,Kang J W,X

13、iong S M.Sci Technol Adv Mater,2001;2:1574Bruschi S,Ghiotti A.Int J Machine Tools Manuf,2008;48:7615Yu H L,Kang J W,Huang S X,Huang T Y.Adv MaterRes,2011;148149:1036Wang P,Xiao N,Li D,Li Y.Mater Sci Forum,2010;654656:15657Wang Z K,Hu Z H.Dongfang Electric Rev,2004;18(3:137(,.,2004;18(3:1378Wang Y X,

14、Zhang P C,Li B C,Zeng W D.China FoundryMach Technol,2007;1:24(,.,2007;1:249Yu H L,Kang J W,Huang T Y.Sci China,2011;54E:8110Jiang R S,Zhang D H,Wang W H,Bu K,Cheng Y Y.Spec Cast Nonferrous Alloys,2009;29(1:13(,., 2009;29(1:1311Han W,Yu W S,Kong S G,Wu J T,Li J T,Ma Z L,Zhao M H.Foundry,2009;58:1108(,.