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1、2.1Accuracy requirements for aircraft assemblyAccuracy requirements for aircraft assemblyAccuracy requirements for aircraft assembly1、Aerodynamic shape accuracy（1）Shape requirements（2）Profile waviness（3）Surface smoothness requirements2、Location accuracy of assemblies and partsPosition requirements f
2、or datum axis(deviation between actual assembly position and theoretical assembly position)3、Accuracy of relative positionsbetween components（1）Accuracy of wing to fuselage position（2）The accuracy of the position of each surface to the fixed wing surface（3）Accuracy of relative position between diffe
3、rent sections of fuselage（4）Accuracy of components1Aerodynamic shape accuracy of components 飞机各部件外形要求示例 架外按等距样板检查部件外形 架内按等距卡板检查部件外形Inspection methodInspection method2Surface smoothness requirements 表面平滑度要求示例（图中数字单位为mm）2Surface smoothness requirements The requirements of the Trident aircraft:The requ
4、irements of the Trident aircraft:Allowable clearanceUpper 7.01.9mmSide 4.41.9mmLower 3.82.5mmStep in fuselageConvex 2.5mmConcave 5.0mmLocation accuracy of assemblies 歼-7机翼与机身的连接Location accuracy of assembliesAxis deviation requirementBeam axis 0.5 1.0mmFrame axisFrame 1.0 2.0mmStrengthening frame 0.
5、5 1.0mmRib axisRib 1.0 2.0mmStrengthening rib 0.5 1.0mm Girder axis 2.0mmAccuracy of relative positions between componentsTypes of accuracy of relative positions between components（1）Accuracy of wing and empennage(horizontal)relative to fuselage position（2）The accuracy of the position of each contro
6、l system relative to the fixed wing surface（3）Accuracy of relative position between different sections of fuselage（4）Accuracy of joints between componentsAccuracy of relative positions between components 1Accuracy of wing and empennage(horizontal)relative to fuselage position 部件间相对位置的准确度要求 机翼、平尾安装角的
7、测量示意图2The accuracy of the position of each control system relative to the fixed wing surface 2The accuracy of the position of each control system relative to the fixed wing surface 副翼相对于机翼的位置的准确度要求A-机翼 B-副翼 1-检验卡板；2-型架；3-机翼外形；4副翼外形Accuracy of joints between components 叉耳式接头1-外翼;2-中翼 Requirements of
8、Fork ear type：Holes and boltsH8/h8 or H9/h9In the fork width directionWith Nominal clearance 0.2 1.0mmWithout Nominal clearanceClearance fit 围框式接头Accuracy of joints between componentsrequirements of Enclosure typeHoles and boltsclearance0.2 0.5mm。Datum of jointl Allow local clearance0.1 0.2mm。l The sum of simultaneous contact area accounts for the total area 70%。