Assembly reliability analysis method based on dimension relationship of adjusting piece group

Abstract

The invention belongs to the technical field of aero-engine assembly, and particularly relates to an assembly reliability analysis method based on the size relationship of an adjusting piece group, which comprises the following steps: step 1, searching and determining an adjusting piece in an assembly size chain as a research object; step 2, determining a size selectable range of an adjusting piece through size chain calculation; step 3, calculating the size relation of the adjusting piece group meeting the requirement for measuring the assembly state of the unreachable assembly; and step 4, judging the assembly reliability of the unreachable assembly. According to the assembly reliability analysis method based on the dimension relationship of the adjusting piece group, the assembly stateof the components which are insufficient in detection space or shielded by other components such as a casing and a housing and cannot be measured can be detected, damage to the components to be detected is reduced, special tools and processes do not need to be designed, secondary assembly does not need to be carried out, and the detection efficiency is improved. The uncertainty of the assembling process can be reduced, and safe, reliable, efficient and low-cost assembling reliability analysis can be achieved.

Description

technical field [0001] The application belongs to the technical field of aero-engine assembly, and in particular relates to an assembly reliability analysis method based on the dimensional relationship of an adjustment component group. Background technique [0002] With the continuous improvement of the demand for thermodynamic machinery, the technology of aero-engines and gas turbines has developed rapidly, and the performance indicators of the engines have continued to rise, which puts forward higher requirements for its assembly accuracy. The specified matching accuracy, connection reliability and specified functions of each engine component are guaranteed by the assembly process. Assembly is the last stage in the engine manufacturing process with a lot of human intervention. The same components, different assembly control procedures, and the performance of the final engine in the test are also very different. Low assembly control precision will cause problems such as oi...

AI Technical Summary

Problems solved by technology

Limited by the assembly space, the assembly control dimensions are often invisible and inaccessible, and it is impossible to directly measure the key dimensions and positions of the assembly

For these positions, two methods are generally used at present. The first is to measure the size of the parts and then calculate the size chain. This method can only calculate the theoretical assembly value and cannot evaluate the impact of assembly errors; the second is to use assembly tools and processes. Guarantee, this method relies too much on the assembly process, and at the same time puts forward higher requirements for assembly tooling and assembly technicians

[0004] However, the method of measuring the size of the parts and then calculating the size chain cannot avoid assembly errors, and the assembly accuracy cannot be tested after assembly. It can only be verified by the whole machine test, but even if there is no abnormality in the test, it cannot directly prove that the assembly accuracy is reasonable.

At the same time, it is easy to cause the risk of component wear

[0005] The use of specific tooling and processes can effectively ensure assembly accuracy, but designing special assembly tooling will greatly increase assembly difficulty, cycle and cost

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