SU1717305A1 - System for controlling hydrostatic rest of machine tool with numerical control - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in heavy metal-cutting equipment. The purpose of the invention is the expansion of technological capabilities. The flow rate of the fluid flowing through the carrier support is continuously monitored by a flow meter 6 installed in the supply line 7. An electrical analog signal from the flow meter 6 is supplied to the CNC 12, then the control signal for the system regulator 5 is deformed. The initial value of the working gap 2 is also set through the CNC Unit 12 using the sensor 14.1 Il.

Description

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The invention relates to mechanical engineering and can be used in heavy metal-cutting equipment.

The purpose of the invention is the expansion of technological capabilities.

The drawing shows a structural diagram of the system.

The stationary base unit 1 through a layer of lubricating fluid 2 mates with the movable unit 3. On the guide surface of the unit 3 there is a pocket 4 of a hydrostatic support, through a controlled regulator 5 and a flow meter B and a hydroline 7 the pocket of the support is connected to a power source. A pressure sensor 8 and a temperature sensor 9, electrically connected by connections 10 and 11 to the CNC device 12, are connected to pocket 4. A flow meter 6 is connected to it by electrical communication 13. To the device 12 CNC connected the setting device 14 of the initial gap and the setting device 15 of the working temperature. The output of the CNC device 12 is connected to the control winding of the controller by electrical connection 16.

The system works as follows.

As is known, the size of the gap is determined by the dependence

P. -

(D

constant value

where Q is the value of the working flow through the support;

Co is the coefficient of hydraulic resistance of a support, depending on its geometry, i.e. values that are constant for each particular system;

ft is the viscosity of the lubricant;

Ro - pressure in the support.

Thus, to ensure h-eonst, it is necessary to constantly provide

To do this, according to the measured pressure in the pocket of the hydrostatic support, a control action is made on the regulator so that the measured flow rate is in accordance with

As follows from expression (1), to ensure h const, the viscosity of the liquid must also be constant. If the machine does not provide heat stabilization with the requirement

const.

by the power of the fridge, then in the ratio

Q w- adjustment is entered for flow with

GO

considering the dependence of viscosity on temperature (t)

 , (2)

where q is the fluid viscosity at the current temperature value;

 - viscosity at 50 ° C;

n - exponent (for oil I20 Ap-2.0).

In accordance with (2), when forming a control action on the controller, the algorithm of the CNC device operation is designed so that the value of Q decreases (to decrease the temperature relative to the setpoint) or increases (as the temperature rises).

To change the settings for the gap or control the gap in the process of performing technological operations, a change of the master signal from the setting device 14 is performed, with which the change is introduced into the algorithm of the device operation

CNC to maintain the ratio -k-.

go

To increase the sensitivity and accuracy of the control action, the electrical winding 16 can be applied to the winding of the regulator 5 by an oscillating harmonic voltage with a frequency exceeding the bandwidth of the control system (usually 100-5 200 Hz).

Claims (1)

Claims of the Hydrostatic Support System of a CNC Cutting Machine Containing a Pocket of the Support Bearing Made on the Guide of the Moving Assembly Associated with a Power Source Through a Regulator Electrically Connected to the CNC Device and a Pressure Sensor 5 connected to the pocket and associated with the CNC device, characterized in that, in order to expand the technological capabilities, an electrically connected with the CNC machine, a flow meter of the working fluid installed between the support pocket and the controller, and the setpoint worker are additionally introduced into the CNC. clearance. 0 five 0 five 0