Heavy pressure micro-gap lubrication test machine

Abstract

The invention discloses a high pressure micro clearance lubrication testing machine, which is applicable to a lubrication testing system which is used to realize the measurement of the depth of a lubricating membrane, friction force and temperature in a micro clearance under the working conditions of high pressure and high shearing rate. The high pressure micro clearance lubrication testing machine comprises a support bench, a lifting bench fixed on the supporting bench, a mechanical system arranged on the lifting bench and a loading system and a temperature system which are connected with the mechanical system respectively. The mechanical system is provided with a ceramic ball, a membrane depth measurement system and a friction force measurement system and comprises a oil tank system and a spindle system. The loading capacity and rheological property of materials under the conditions of high pressure micro clearance lubrication can be assessed by controlling the maximum contact force, interface clearance and shearing rate between the ceramic ball and a ceramic sleeve on the spindle so as to provide experiment data for creating lubrication model in a high pressure micro clearance and provide solutions to optimize the selection of lubricating and abrasion-resisting materials in tough conditions.

Description

technical field [0001] The invention relates to a testing machine, in particular to a high-pressure micro-gap lubrication testing machine capable of real-time measurement of the lubricating film thickness, friction force and temperature in the micro-gap under the condition of high pressure and high shear rate. Background technique [0002] In aerospace, ultra-precision machinery and other fields, the movement accuracy and manufacturing accuracy of many key components need to reach the submicron or even nanometer level, accompanied by high load point and line contact; the corresponding friction pair clearance will reach 1-100nm nanometer level level, pressure up to 3GPa, shear rate up to 10 8 -10 10 / s. The behavior and failure rules of lubricating materials in the micro-gap no longer conform to the macroscopic lubrication theory; high shear rate will cause the molecular chain of lubricating materials to break; high pressure will cause the breakdown of lubricating film. Th...

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Problems solved by technology

[0004] Although the lubrication test institutions disclosed in the above-mentioned patent documents all carry out real-time monitoring and timely feedback control on the friction and wear performance and lubrication characteristics of lubricants, or enhance the lubrication performance through surface treatment, the lubrication behaviors studied are all under normal conditions. The monitoring and research on the lubricating characteristics and friction and wear performance of the material, while the lubricating bearing capacity and rheological characteristics of the material under some harsh conditions have not yet been studied

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