Method for controlling oil film thickness of static pressure workbench based on working condition coefficient method

Abstract

The invention relates to a method for adjusting and controlling the oil film thickness of a static pressure workbench under time-varying working conditions, and belongs to the field of mechanical engineering. The method avoids the time-varying working condition factors affecting the formation of the oil film thickness, such as the structure size, load, cutting force, oil temperature and viscosityof a workbench; and only a set of motor frequency needs to be set under the current working conditions, the corresponding oil film thickness is measured, and a one-to-one correspondence relation between the motor frequency and the oil film thickness is obtained, so that the average working condition coefficient of the set of data is obtained, a control model between the motor frequency and the oilfilm thickness is established, an oil film thickness target value is substituted into the control model, the motor frequency is inversely calculated, the frequency is the required motor frequency forthe time-varying working conditions, and then the motor is driven at the motor frequency to drive an oil pump to adjust the oil film thickness to the target value. A device of the method has the advantages of simple process, accurate adjustment result, small adjustment error and the like.

Description

technical field [0001] The invention relates to a method for adjusting and controlling the oil film thickness of a static pressure workbench under time-varying working conditions, and belongs to the field of mechanical engineering. Background technique [0002] The static pressure rotary table has the characteristics of small friction, low wear, low speed without crawling and stable working state, and is widely used in large and heavy precision machine tools. However, in practical applications, the oil film thickness of the hydrostatic rotary table changes with the change of working conditions, such as external load, cutting force, oil temperature and other working conditions, and deviates from the design target value. At the same time, the oil film thickness measurement must be accurate to microns, The accuracy requirement is very high, so it is difficult to establish an accurate control model to adjust the oil film thickness to the target value. Controlling the oil film t...

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Problems solved by technology

[0003] Usually, the control method of the oil film thickness of the static pressure workbench is to start from the structure of the oil supply system of the static pressure workbench, analyze the transfer function of each link of the system, establish an oil film thickness control model based on the transfer function, and adjust and control the oil film thickness However, most of the changes in working conditions are ignored, such as changes in table load, cutting force, oil temperature, viscosity of hydraulic oil, etc. Even with compensation measures, it is difficult to achieve precise control of oil film thickness

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