A kind of end tooth structure fretting fatigue test device and test method

Abstract

The invention discloses an end tooth structure fretting fatigue test device and a test method, wherein the test device includes a concave tooth fixing component, a convex tooth clamping component and a normal force loading component, and the concave tooth fixing component realizes the fixing of the concave tooth test piece. The convex tooth clamping assembly realizes the loading of the convex tooth test piece, and the normal force loading assembly realizes the application of horizontal load. The horizontal loading device of the fretting fatigue test adopts a symmetrical structure layout, and the load is realized by a hydraulic loading system. The hydraulic loading system adopts a closed force It is a frame structure with no external force output, which does not affect the vertical loading of the fatigue testing machine. The concave tooth test piece is subjected to preload in the horizontal direction, and the vertical direction is pressed by the concave tooth pressure plate to ensure that the horizontal The direction of loading remains unchanged. The present invention can approximately simulate the force condition of the end teeth in the actual working environment, cooperate with the ordinary single-axis fatigue testing machine, and can carry out the fretting fatigue test of the end tooth structure simulation parts, and reduce the experiment cost.

Description

[0001] Technical field: [0002] 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. [0003] Background technique: [0004] 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-...

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Problems solved by technology

[0004] 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

[0006] 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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