High-precision assembly technology of bolt connection with spigot structure under axial deviation
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摘要:
针对航空发动机止口螺栓连接结构安装边装配精度差的问题,提出了轴线偏差下止口螺栓连接结构的装配机理和误差分析,基于此进一步构建了可记录圆心偏移量的安装边装配模型,并通过同心度比较了拧紧顺序、拧紧步数和工艺螺栓数量的装配精度。最后以缩尺模拟件进行试验验证,以组件同心度和上下两级盘外伸端端面变形变化量为表征获取了最优装配工艺。结果表明:(1)止口螺栓连接结构的过盈止口对轴线偏差有补偿作用,仿真中效果更明显,可以使200 μm轴线偏差几乎减小到0 μm,试验中也可使122 μm轴线偏差大幅降低;(2)最优装配工艺为拧紧顺序应使用对角交叉拧紧、拧紧步数应使用三步拧紧、工艺螺栓数量应使用4颗。(3)倾斜装配试验中同心度增大了4.69倍,装配过程中一定要避免倾斜装配。
Abstract:Aiming at the problem of poor assembly accuracy of the mounting side of the aero-engine stop bolt connection structure, the assembly mechanism and error analysis of the stop bolt connection structure under the axial deviation are proposed, based on which the mounting side assembly model that can record the circular center offset is further constructed, and the assembly accuracy of the tightening sequence, the number of tightening steps, and the number of process bolts are compared by concentricity. Finally, the optimal assembly process was obtained by test validation with reduced-scale simulated parts, characterized by the concentricity of the assembly and the amount of deformation change of the upper and lower two-stage discs' outreach end surfaces. The results show that: (1) the surplus stop of the stop bolt connection structure has a compensating effect on the axial deviation, and the effect is more obvious in the simulation, which can make the 200 μm axial deviation almost reduced to 0 μm, and the 122 μm axial deviation can be greatly reduced in the test; (2) the optimal assembly process is that the tightening sequence should use diagonal cross-tightening, the number of steps of tightening should use three-step tightening, and the number of process bolts should use four. (3) The concentricity increased by 4.69 times in the tilted assembly test, and tilted assembly must be avoided in the assembly process.
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Key words:
- bolt connection with spigot /
- axial misalignment /
- assembly accuracy /
- concentricity /
- assembly process
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表 1 不同拧紧顺序最终圆心偏移量
Table 1. Final center offset for different tightening sequences
μm 部件编号 顺序拧紧 拧紧顺序对角顺序 对角交叉 三级盘 22.2 8.1 0.6 五级盘 29.8 11.2 0 表 2 不同拧紧步数最终圆心偏移量
Table 2. Final center offset for different tightening steps
μm 部件编号 拧紧步数 1 2 3 三级盘 8.1 2.6 1.4 五级盘 11.2 2 0 表 3 不同工艺螺栓数量最终圆心偏移量
Table 3. Final center offset for different number of process bolts
μm 部件编号 工艺螺母数量 0 2 4 三级盘 11.2 8.1 0 五级盘 15.2 11.2 0 表 4 不同倾斜度最终圆心偏移量
Table 4. Final center offset for different tilts
μm 部件编号 倾斜角度/(°) 0 0.1 0.15 三级盘 0.2 8.1 8.7 五级盘 0.8 11.2 11.9 表 5 不同拧紧顺序同心度数据
Table 5. Concentricity data for different tightening sequences
序号 三级盘
拟合圆心/μm五级盘
拟合圆心/μm同心度/μm 1 (−72.62, 114.66) (−57.99, 69.63) 47.34 2 (−44.87, −73.66) (−19.88, 28.79) 105.45 3 (133.85, 32.08) (−146.94, 5.57) 29.57 表 6 不同拧紧步数同心度数据
Table 6. Concentricity data for different tightening steps
μm 序号 三级盘
拟合圆心五级盘
拟合圆心同心度 1 (−72.62, 114.66) (−57.99, 69.63) 47.34 4 (58.74, 48.02) (49.58, 20.72) 28.91 5 (39.53, 59.83) (26.72, 39.77) 20.54 表 7 不同工艺螺栓数量同心度数据
Table 7. Concentricity data for different number of process bolts
μm 序号 三级盘
拟合圆心五级盘
拟合圆心同心度 1 (−72.62, 114.66) (−57.99, 69.63) 47.34 6 (−39.39, 164.58) (−35.39, 42.02) 122.60 7 (36.48, −31.33) (86.12, −78.37) 68.38 表 8 倾斜装配同心度数据
Table 8. Tilt assembly concentricity data
μm 序号 三级盘
拟合圆心五级盘
拟合圆心同心度 1 (−72.62, 114.66) (−57.99, 69.63) 47.34 8 (−147.76, 25.26) (35.83, −222.23) 269.27 -
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