Method for controlling oil film thickness of static pressure rotating table to be constant under eccentric load

Abstract

When the mass center of a workpiece deviates from the center or the torque generated by tool machining enables a workbench to incline with a spindle as the center, the thickness of an oil film is changed, and a traditional oil film control method cannot effectively solve the problem that the workbench inclines. According to the three-channel oil film control scheme, macroscopic regulation and microscale regulation are started from the two aspects of macroscopic regulation and microscale regulation, according to macroscopic regulation, a sensor detects that the thickness of an oil film changes, when the deviation between the thickness of the oil film and a given value is larger than 0.001 mm, a signal is fed back to a controller, and the controller regulates the rotating speed of a motor, so that the output flow of a constant displacement pump changes; the oil film thickness of the oil pad is macroscopically regulated and controlled, when the displacement sensor detects that the deviation between the oil film thickness and a given value is smaller than 0.001 mm, a signal is transmitted to the PLC, and the PLC controls the opening size of the electromagnetic speed regulating valve and slightly regulates and controls the oil film thickness, so that the oil film thickness is controlled. And the problems of dry friction, unstable operation, bearing failure and the like caused by the change of the thickness of an oil film are effectively solved.

Description

Technical field [0001] The present invention belongs to the vertical numerical control processing equipment technology field, particularly relates to a static pressure rotary table oil film thickness constant control method under eccentric load. Background [0002] With the upgrading and transformation of the manufacturing industry, the processing of heavy parts is becoming more and more diversified, when the workpiece center deviates from the center of the workbench, the workbench bears the eccentric force, and the thickness of the oil film in operation is unstable, which reduces the quality of the workpiece processing, and even causes the oil film thickness to become thinner locally, and finally dry friction occurs. As the core component of heavy vertical processing equipment, it is necessary to study the control scheme of the thickness of the hydrostatic support oil film under its bias load condition. The traditional oil film thickness control method is to adjust the oil supp...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the thickness of the oil film is uneven under the eccentric load condition, which causes the processing accuracy of the static pressure rotary table to decrease, and then proposes a three-channel regional oil supply scheme to ensure the static pressure rotary work under the eccentric load constant oil film thickness

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