Device and method for testing dynamic characteristics parameters of joint part of rolling-sliding combined guide rail

Abstract

The invention discloses a device and a method for testing dynamic characteristics parameters of a joint part of a rolling-sliding combined guide rail based on a two-degree-of-freedom system. The test device comprises a test platform and a data collection and analysis system. Compared with the prior art, the device has the obvious advantages that the test platform is simplified as a system with two degrees of freedom so as to be more approximate to the self degree of freedom of the test platform, the theory error is reduced, the test complexity degree is reduced, and dynamic characteristic test signals of a movable component and a foundation can be acquired more easily and accurately; the influence of the foundation displacement is taken into consideration, four sizing blocks are arranged so as to regulate the stability of the test platform, so that the influence of external environment excitation on the test device is further eliminated, and the test accuracy is improved; by virtue of directly testing the dynamic characteristic parameters of the joint part of the rolling-sliding combined guide rail, the influence of a complex joint surface in the joint part is reduced, and the parameter testing accuracy is improved.

Description

technical field [0001] The invention belongs to the field of machine tool guide rail pairs, in particular to a testing device and a testing method for dynamic characteristic parameters of a joint of a rolling-sliding composite guide rail. Background technique [0002] Machine tool guide rail is the key core component in the feed system of modern CNC machine tools, and the dynamic characteristics of its joint part affect the rigidity, precision and precision retention of CNC machine tools to a large extent. Therefore, in order to realize the dynamic optimization design of the machine tool structure and improve the overall performance of the machine tool, it is of great significance to study the test method of the dynamic characteristic parameters of the guide rail junction of the machine tool. The rolling-sliding composite guideway is a new type of guideway with low friction resistance, excellent motion performance, strong bearing capacity and good vibration resistance of the...

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Problems solved by technology

[0003] Document 1: Chinese Patent: Testing Device and Testing Method for Dynamic Characteristic Parameters of Sliding Rail Joint Surface, Application Number: 201010622646.5 and Document 2: Chinese Patent: Testing Device and Testing Method for Dynamic Characteristic of Sliding Joint Surface, Application Number: CN201010617228.7, both It is based on the established equivalent single degree of freedom, artificially eliminating the influence of foundation displacement to perform parameter identification on two identical joint surfaces (sliding joint surfaces), and does not consider the modal quality of the mode used for further identification , there is a large error in the identified dynamic characteristic parameters; and the test device used fails to propose a method to adjust the level of the test platform and eliminate the influence of the external environment on the test platform, so that the test device cannot well meet the requirements of the test principle. requirements, resulting in further principle errors

[0004] Document 3: Chinese Patent: Testing Device and Method for Dynamic Characteristic Parameters of Rolling Guide Joint Surface, Application Number: 2010560911.1 and Document 4: Chinese Patent: Identification System and Method for Dynamic Characteristic Parameters of Rolling Guide Joint Surface, Application Number: 201010298969.3, both It is based on the established equivalent single degree of freedom, artificially eliminating the influence of foundation displacement to perform parameter identification on two identical joint surfaces (rolling joint surfaces), and does not consider the modal quality of the mode used for further identification , there is a large error in the identified dynamic characteristic parameters; and the test device used fails to propose a method to adjust the level of the test platform and eliminate the influence of the external environment on the test platform, so that the test device cannot well meet the requirements of the test principle. requirements, resulting in further principle errors

[0005] It can be seen from the above that the principle error and the interference of external excitation in the existing technology have a negative impact on the accurate identification of the dynamic characteristic parameters of the joint of the rolling-sliding composite guideway.

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