Surface-to-surface contact torsional fretting friction-wear testing system and control method thereof

Abstract

The invention discloses a surface-to-surface contact torsional fretting friction-wear testing system and a control method thereof. The testing system comprises a loading device, a positioning and clamping device, a friction pair, a driving device, a data acquisition device and a computer measurement and control system, wherein the loading device is used for applying positive pressure to the friction pair through a loading steel ball and keeping surface contact load in an operation process of the friction pair to be stable. A torque sensor, a driving motor signal and an angular displacement signal of the data acquisition device are connected with a computer data acquisition and control system; angular displacement amplitudes of a fretting friction pair are recorded and controlled and a change condition of a fretting friction torque is output in real time. The testing system and the control method thereof, provided by the invention, have the characteristics of convenience for operation, stable loads and relatively high angular displacement amplitude precision and can be used for reflecting torsional fretting friction-wear properties of an actual working condition better and the like; torsional fretting friction research under different loads, frequencies and angular displacement amplitudes can be carried out.

Description

technical field [0001] The invention belongs to the technical field of torsion fretting friction and wear test, and more specifically relates to a surface-to-surface contact torsion fretting friction and wear test system and a control method thereof. Background technique [0002] Fretting refers to the relative motion with extremely small amplitude (displacement amplitude is generally on the order of microns) between the contact surfaces under the action of alternating loads such as mechanical vibration, fatigue load, electromagnetic vibration or thermal cycle. These contact surfaces are usually nominally It is static, so fretting occurs in the "fastened" mechanical parts, causing the wear of the mating surface and the initiation and expansion of cracks, etc. have occurred, which has had a serious impact on its service life. Therefore, it is of great theoretical and practical significance to study the fretting wear law for the contact conditions under specific working condi...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent (patent publication number is CN103196766A) discloses a steel wire fretting friction and wear tester, which can perform friction and wear experiments on the upper sample steel wire and the lower sample steel wire, and can steplessly adjust the sliding stroke of the micro motion table The pressure load on the surface of the fretting table is not suitable for fretting wear tests of other contact forms; another Chinese patent (patent publication number is CN103063530A) discloses a fretting friction and wear testing machine, which can use computer data The processing device automatically controls the operation of the loading device according to the positive pressure signal, and automatically evaluates the wear performance under the corresponding normal stress signal and displacement signal of sample A and sample B according to the fretting friction signal, and sample A can be cylindrical or spherical , or block configuration, but the device only simply replaces the sample A, and does not make corresponding adjustments for different contact forms according to its different contact characteristics, and its motion form cannot meet the requirements of twisting and fretting In addition, there is a Chinese patent (the patent announcement number is CN201555762U) which discloses a sliding friction experiment adaptive chuck, which can make the surfaces of the friction pairs fully contact, but does not involve the specific testing machine structure, and its motion form is sliding form

Images