SU1248765A1 - Method of stabilizing the position of working members of machine - Google Patents

Description

The invention relates to a machine tool industry and can be used in precision machine tools for stabilizing the positions of working bodies.

The purpose of the invention is to reduce the time of stabilization of the relative position of the working bodies due to their preliminary mutual stabilization, and then their subsequent stabilization relative to the specified positions.

FIG. 1 shows a block diagram of a device for implementing the proposed method; in fig. 2 shows a scheme for implementing the method with two types of deviations.

The device (Fig. 1) contains working bodies 1 and 2 mounted on drives 3 and 4, for example magnetically friction ones. The positions of working bodies 1 and 2 are measured by means of sensors 5 and 6 in a single reference system. Conversion of signals from sensors 5 and 6 and driver units 7 and 8 is carried out by means of comparison units 9 and 10, analyzer 11, inverter 12, switches 13 and 14, and amplifiers 15 and 16, which can be performed using well-known circuits based on operational amplifiers and comparators or based on. microprocessor.

The diagram (Fig. 2) shows in flat lines the positions of the working bodies 1 and 2 at various points of stabilization. The positions of the working bodies relative to the given values are characterized by the deviations: Aj is the deviation of the working body 1; D2 is the deviation of the working body 2; Lr is the difference of deviations of the working bodies.

The stabilization of the position of the working bodies is as follows.

The positions of the working bodies 1 and 2, measured by sensors 5 and 6 (Fig. 1), are transmitted as signals to blocks 9 and 10 of comparison, where they are compared with signals from driver blocks 7 and 8. Based on comparisons, blocks 9 and 10 produce signals deviations from the given positions. - the case of unilateral deviation of the working bodies (Fig. 2). These signals are fed to the normally switched on inputs of switches 13 and 14 and to the inputs of the analyzer 11. Analyzer 11 generates a difference signal Ap A - - Ld and a signal of the smallest value received at the control input of switch 14. The signal through inverter 2 goes to normally disabled input of switch 14 in the form of Ap-. At the same time, the switch 14 is switched, and the signal Od through the amplifier 16 is fed to the actuator 4, which in accordance with it moves the working element 2. At the same time, the working element 1 moves by the actuator 3 in accordance with signal 4i, coming through the switch 13 and the amplifier 15. Upon reaching that corresponds to a given

In the NOM case of stabilization of the relative position of the working bodies (Fig. 2), the analyzer 11 stops generating a signal at the control input of the switch 14. This switches the switch 14 to its initial state, and the signal D2 goes through the amplifier 16 again to the actuator 4. 2 moves in accordance with signal A2. When achieving equality D | Fg O, which indicates the compliance of the provisions of the working bodies with the specified, stabilization ends. In case of deviations of the positions of the working bodies from the given ones, the process is repeated in a similar way.

Similarly, stabilization of the positions of the working bodies is carried out for all relevant positions in degrees of freedom.

We will conduct a comparative analysis of the proposed method with the known.

(Fig. 2 shows the positions of the working bodies in the process of stabilization according to a known method using the dash lines).

To simplify the analysis, we assume that, when stabilized, the working bodies move uniformly at speeds V. The largest corresponding deviations from the specified positions along the X axis are AIMSKC D2max ± 5 µm, the accuracy of the relative position, which determines the sensitivity of the device, is required.

With one-sided deviation of the working bodies (Fig. 2), the stabilization time of the relative position for a known method is

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Based on the fact that the considered combinations of deviations are equally likely, the effectiveness of the proposed method is

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Thus, for the most typical case, the stabilization time of the relative position of the working bodies according to the proposed method is reduced by a factor of 5.5 compared with the known one.

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Claims (1)

METHOD FOR STABILIZING THE POSITION OF THE WORKING BODIES OF THE MACHINE, in which the positions of the working bodies are measured, they are compared with the set, the deviations from the set positions are determined and the positions of the working bodies are proportional to the deviations, characterized in that, in order to reduce the stabilization time of the relative position of the working bodies, the values are compared their deviations from the given positions and determine the difference of these values, the working body with a larger deviation is moved towards the specified position , The working body with the smaller value of deviations is moved toward the first working member, and when the difference of deviations working elements is equal to zero, the direction of movement of the second operating element is changed to the opposite. FIG. 1