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《冲压工艺与模具设计练习答案(贾俐俐教材).pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、.冲压工艺与模具设计思考与练习答案第一章第2章5、计算下图所示零件的凸、凹模刃口尺寸及其公差(图(a)按分别加工法,图(b)按配作加工法)解:a图已知材料为Q235钢,材料厚度t=1mm.00.200.13外形尺寸400.20由落料获得,28.20.10,220,500.10由冲孔同时获得。查表2.5得Zmin=0.132,Zmax=0.240,则Zmax-Zmin=0.240-0.132=0.108mm。由标准公差数值表查得磨损系数x0外形尺寸400.20为IT11级,取X=0.750.20孔28.20.10
2、为IT11级,取X=0.75'..0.13孔220为IT11级,取X=0.75(P37工件精度IT10以上X=1;工件精度IT11~IT13,X=0.75;工件精度IT14,X=0.5)设凸、凹模分别按IT6和IT7级加工制造,则0.201、冲孔:28.20.10IT6级公差值=0.009;IT7级公差值=0.015000dp(dminx)p(8.30.750.10)0.0098.3750.009mm0.0150.015d(dZ)d(8.2750.132)8.507mmdPmin000校核:pdZmaxZmin
3、0.009+0.015≤0.240-0.1320.024≤0.108(满足间隙公差条件)0.132、冲孔:220IT6级公差值=0.013;IT7级公差值=0.021000dp(dminx)(220.750.13)0.01322.09750.013mmpd0.0210.021dd(dPZmin)0(22.09750.132)022.22950mm校核:pdZmaxZmin0.013+0.021≤0.240-0.1320.034≤0.108(满足间隙公差条件)03、落料:400.20IT6级公差值=0.016;I
4、T7级公差值=0.025d0.0250.025Dd(Dmaxx)0(400.750.2)039.850mm000Dp(DdZmin)(39.850.132)0.01639.7180.016mmp'..校核:pdZmaxZmin0.016+0.025≤0.240-0.1320.041≤0.108(满足间隙公差条件)最外形尺寸:D=50+(2×8)=66mm因为没注公差,按IT140级计算,X=0.5、查表得66。制造公差:IT6=0.019mm0.74IT7=0.030mmd0.0300.030Dd(Dmaxx)
5、0(660.50.75)065.6250mm000DP(DdZmin)p(65.6250.132)0.01965.4930.019mm校核:pdZmaxZmin0.019+0.030≤0.240-0.1320.049≤0.108(满足间隙公差条件)4、孔距尺寸:500.100.2LdL50500.025mm88或cd(cmin0.5)cp(cmin0.5)880.2Ld(49.90.50.2)500.025mm8'..解:b图已知材料为08钢,材料厚度t=1mm.该工件为落料件,选凹模为设计基准件,首先计算落料
6、凹模刃口尺寸及制造公差,然后按间隙配作凸模刃口尺寸。(1)落料凹模刃口尺寸制造公差001)600.74、8-0.15尺寸磨损后增大,按落料凹模计算公式计算,由公差表查得工件尺寸的公差等级:0A1:600.74为IT14级,X=0.5A2:08-0.15为IT12级,X=0.75dDd(Dmaxx)00.74/40.185A1=(600.50.74)059.630mm0.15/40.0375A2=(80.750.15)07.88750mm'..0.150.212)100、200尺寸磨损后减少,按凸模计算公式计算,
7、由公差表查得工件尺寸的公差等级:0.15B1:100为IT12级,X=0.750.21B2:200为IT12级,X=0.750dp(dminx)p00B1=(100.750.15)0.15/410.11250.0375mm00B2=(200.750.21)0.21/420.15750.0525mm3)120.22、50.15尺寸为磨损后基本不变,代入公式孔心距LdL冲孔:Cp(Cmin0.5)落料:Cd(Cmin0.5)8880.44C112120.055mm80.44或C1(11.780.50.44)120.
8、055mm80.30C2=550.0375mm8(2)凸模刃口尺寸凸模实际刃口尺寸与落料凹模配制,保证最小双面合理间隙,查表(2.5)得Zmin=0.10.'..'..第3章弯曲工艺与模具设计7、弯曲下图所示零件,材料为35钢,已退火,料厚度为4mm.。请完成以下工作:(1)分析弯曲件的工艺性;(2)计算工件的弯曲展开长度和弯曲力(采用校正弯曲);(3)绘制弯曲模结构草图;(4)确定弯
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