Combined surface modeling method considering rough surface waviness and micro-bulge interaction

Abstract

The invention discloses a combined surface modeling method considering rough surface waviness and micro-bulge interaction. The method comprises the steps of obtaining microscopic outline data of a tested surface through a three-dimensional morphology measuring instrument, and superposing morphology data of corresponding points of an upper surface and a lower surface by utilizing a superposition principle of random components to obtain a combined morphology of a combined surface; and separating a waviness component and a roughness component of the combined morphology by adopting Fourier series,wherein the combined morphology of the combined surface contains the waviness and the roughness. A new combined surface contact model is provided; the influence of a contact state of the combined surface, the waviness and the roughness in the morphology and micro-bulge deformation interaction on a contact characteristic of the combined surface is considered; and the obtained data is compared withtest data to verify the correctness of the built model. The model solves the problem of an existing contact model and provides a new idea and method for researching a contact mechanism of the combined surface.

Description

technical field [0001] The invention relates to the field of research on the contact deformation mechanism of joint surfaces, in particular to a joint surface modeling method considering rough surface waviness and asperity interaction. Background technique [0002] There are a large number of joints in the CNC machine tool, which destroys the continuity of the structure, thus showing complex mechanical characteristics, which greatly affects the dynamic performance of the whole machine. Studies have shown that the contact stiffness of the joint in the machine tool accounts for about 60% to 80% of the total stiffness of the machine tool, the contact damping of the joint accounts for more than 90% of the total damping of the machine tool, and the deformation caused by the joint accounts for about 40% of the total deformation of the machine tool. %~60%. Therefore, the research on the static and dynamic characteristics of the joint is the key to the mechanical system from single...

AI Technical Summary

Problems solved by technology

There are also some domestic and foreign scholars who have proposed some new models based on the GW model, but they have ignored the interaction between asperities and the influence of waviness.

Neglecting the interaction between asperities and the influence of waviness will increase the error between the theoretical model and experimental data

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