22 4 Vol.22 No.4 200212JOURNALOFCENTRALSOUTHFORESTRYUNIVERSITYDec.2002 []1000-2502(2002)04-0085-04电容器外壳落料-拉深复合模具的设计(,412006)[ ] ,,..[] ;;;[] TG352 [] ATheDesignofPunching-StretchingMouldoftheOuterCasingofanElectricCapacityLIUJian-an(CollegeofIndustryofCentralSouthForestryUniversity,Zhuzhou412006,Hunan,China)Abstract:Analysesweremadeofthestress-strainandthereasonofcrackinginthetube-shapedobjectwhentheoutercasingofanelectriccapacitywasstretchedtoform.Theregularpatternofstress-strainandmethodsofavoidingwinklingandcrackingwerefound.Asaresult,thequalityofproductshasremarkablybeenimproved.Keywords:outercasingofelectriccapacity;stretchingmould;stress-strain;design(1),(T2),t=0.65mm.,,,,,,.,,,,,,.,,,.1 电容器外壳落料-拉深模具工艺尺寸的确定,D0=20mm,t/D=0.0325,[1]m=0.50,r=3mm,(2).5,,4.:m1=0.53,m2=0.756,m3=0.78,m4=0.80.,1.3~1.4t,0.819~0.882mm[2].0.040~0.052mm.2 法兰变形区应力应变分析及防止皱裂的措施,,,R0Rt.[]2001-12-21[](1967-),,,,,..[2]: ed+|eθ|=es.(1) 1 2 Fig.1 Outercasingofan Fig.2 Firststretching-electriccapacitytechnologydrawing(1),ed,eθ,es.(3-b),dd,dθ,.,(2): (ep+dep)(d+dp)tdθ-epdtdθ+2eθddtsin(dθ/2)=0.(2)dθ,sin(dθ/2)≈dθ/2,(2) ded/dd+(ed+|eθ|)/d=0.(3)(1)、(3),3 Fig.3 Distributionofstressofthestretchedtube-shapedobject ded=-esdd/d.(4)(4): ed=-es∫ddd=-eslnd+c.(5)(5),c,d=Rt,ed=0,c=σslnRt,(5): ed=esln(Rt/d).(6)(6)(1) eθ=-es〔1-ln(Rt/d)〕.(7)(6)、(7):edeθd(3-c).:(1)ed,d=r0edmax=esln(Rt/r0).(2)eθ,.eθmax=Ues.(3),,eθed,,.(R=0.61R0),()Xn=0,,,en=0,: eθ/ed=(Xθ-Xn)/(Xd/Xn).(8)(8):Xn,Xp,Xθ.(Xd+Xθ+Xn=0)(8)Xd,(6)、(7)(8),: Xn=Xθ〔2ln(Rt/R)-1〕/〔2-ln(Rt/R)〕.(9)(9),2ln(Rt/R)1,R0.61Rt,XnXθ,,Rt/R,Xn,,.Rt=R=R0,Xn=0.5Xθ;2ln(Rt/R)1,R0.61Rt,XnXθ,Xn,.,.,edmax.edmaxeθmax,,R0Rt,86 22(4).4 σpmaxFig.4 Changingcurvesof“σρmax”indifferentstretchingmodeule5 Fig.5 Stressschematicdiagramofbentstripsteelalongentranceofconcavemoulddθ;M;t;ds;d;b“1 -”,0.53,=20,5Rt/R0=0.81,Rt=0.81×(20/2)=8.1mm,Dt=2Rt=16.2mm,,=16.2mm.,,,,.,,(),r=4mm,.3 筒壁变形区应力分析及防止拉裂的措施,,,.,,.,,,eW′eW″..(5).,M[3]:M=2∫t/20esbydy=2esmb∫t/20ydy=esmbt24.(10)(10),esm,y,dy.ds=ddθ,W: W=Mdθ=esm(bt2/4)dθ.(11)eW,eWdsW′: W′=eW′btds=eW′btddθ.(12)W=W′d=ra+t/2,eW′=esm(1/2)〔t/(2rd+t)〕.(13),eW″,eW′,: eW″≈eW′=esmt/〔2(2rd+t)〕.(14),,、eW eW=eW′+eW″=2esmt/2(2rd+t)=esmt/(2rd+t).(15)em′,e_a.,Q,em: em=2_Q/πdt.(16)(16),_,Q,d,t.,P:874:-6 Fig.6 AssemblyDrawing1.;2.;3.;4.;5.;6.;7.;8.;9.;10.;11.;12.;13.;14.;15.;16.;17.;18.;19.;20.;21.;22.;23.;24.;25.;26.;27.;28.;29.;30.;31.;32. P=ed+em+eW+en′=(ed+em+eW)eμα=〔1.1σsmln(Rt/R)+2_Q/πdt+σsmt/(2rd+t)〕eμα.(17)(17),e,T._,T=π/2,eμα≈1+1.6_.: P=〔1.1esmln(Rt/R)+2μQ/πdt+esmt/(2rd+t)〕(1+1.6_).(18)≥6B,,.、,、4.(1),r=3mm,r=4mm.(2)、.0.030~0.042mm[4],0.040~0.052mm.(3)、.(4),.4 模具总体结构和技术经济效果6、.、()1,,.,.,100%,.[ ][1] .[M].:,1998.[2] .[M].:,1998.216-217.[3] 《》.[M].:,2000.91-92.[4] .[M].:,1999.14.[本文编辑:邱德勇]88 22