Testing device and testing method for fretting fatigue of end-tooth structure

Abstract

The invention discloses a testing device and a testing method for the fretting fatigue of an end-tooth structure. The testing device comprises a concave tooth fixing assembly, a convex tooth clamping assembly and a normal force loading assembly, wherein the concave tooth fixing assembly is used for realizing the fixation of a concave tooth test piece; the convex tooth clamping assembly is used for realizing the loading of a convex tooth test piece; the normal force loading assembly is used for realizing the application of a load in a horizontal direction; a fretting fatigue testing level loading device adopts a symmetrical structure layout and the load is realized by a hydraulic loading system; the hydraulic loading system adopts a closed force system framework structure and has no output of external force, and the load of a fatigue tester in the vertical direction is not influenced; and a concave tooth test piece bears a pre-tightening force load in the horizontal direction and is tightly pressed by a concave tooth pressing plate in the vertical direction, so that the loading direction in the horizontal direction of a loading process keeps unchanged. According to the testing device, a common single-shaft fatigue tester is matched by similarly simulating the stress condition of end teeth under an actual working environment, so that a fretting fatigue test of an end-tooth structure simulating piece can be carried out and the experiment cost is reduced.

Description

Technical field: [0001] The invention relates to an end tooth structure fretting fatigue test device and a test method, which belong to the technical field of life evaluation tests of materials and structural parts. Background technique: [0002] The end-tooth structure is widely used in aeromechanical turbine engine transmission spindles and transmission devices of various high-speed, large-scale and heavy-duty mechanical equipment. It has the advantages of fewer transmission teeth, compact structure, and high load-bearing capacity. Among them, the fretting fatigue between the mating contact surfaces of the concave and convex teeth will lead to a significant decrease in fatigue life. However, it is difficult to conduct fretting fatigue test research on three-dimensional structural parts of end teeth, mainly because of two technical problems: (1) the end tooth structure needs to be processed by a special gear grinding machine, and the processing cost of three-dimensional str...

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Problems solved by technology

[0002] The end-tooth structure is widely used in aeromechanical turbine engine transmission spindles and transmission devices of various high-speed, large-scale and heavy-duty mechanical equipment. It has the advantages of fewer transmission teeth, compact structure, and high load-bearing capacity. In the middle, the fretting fatigue between the mating contact surfaces of the concave and convex teeth will lead to a significant decrease in the fatigue life

However, it is difficult to conduct fretting fatigue test research on three-dimensional structural parts of end teeth, mainly because of two technical problems: (1) the end tooth structure needs to be processed by a special gear grinding machine, and the processing cost of three-dimensional structural parts is too high; (2) For the fatigue test of three-dimensional structural parts, it is necessary to consider the actual stress of the end tooth structure, mainly including axial preload, torque and centrifugal force. If it is necessary to completely simulate the stress of its real three-dimensional structure, a rotation test is required In the non-rotating test, when considering the preload and torque alone, it is also necessary to use a multi-axis fatigue testing machine to achieve

[0004] The existing loading device for fretting fatigue test with uniaxial fatigue testing machine mostly adopts the loading ring structure and loads through bolts, but the driving force of the thread loading scheme is small, and various factors such as vibration during the fatigue process are likely to cause the thread The connection is loose, causing a change in the loading normal force

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