SU1474452A1 - Method and device for testing surface of electroconductive article - Google Patents

Abstract

The invention relates to a measurement technique and can be used in mechanical engineering for monitoring the state of the surface of metal products. The purpose of the invention is to improve the accuracy and resolution of the control, which is achieved by eliminating the "drift zero" when measuring the current, which characterizes the controlled parameters of the product surface, as well as increasing the operating voltage range. Using a current meter containing a current setting device 7, connected in series with the current sensor 6, and a comparison unit 8, the current between the measuring electrode 4 and the monitored product 3 to which high voltage is applied from a high voltage source 5 is measured. Comparing the magnitude of this current with the values on the corresponding calibration curves or with the values of the current from the surface of the reference sample with a known degree of roughness, determine the degree of roughness of the surface of the test product 3. 2 cf f-crystals, 2 Il.

Description

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This invention relates to a measurement technique and can be used in mechanical engineering.

The purpose of the invention is to improve the accuracy and resolution of the control of the surface of electrically conductive products, achieved by eliminating zero drift when measuring the current, which characterizes the controlled parameters of the surface of the product, as well as increasing the operating voltage range.

Figure 1 shows a block diagram of a device that implements a method for controlling the surface of electrically conductive products; Fig. 2 shows the curve of the change in the current flowing through the measuring electrode when taking measurements along the edge of the monitored product.

The device consists of a cuvette 1, filled with a dielectric liquid 2, in which a controlled product 3 is placed, a measuring electrode 4, made in the form of a conductor

the condition r / R., high voltage source 5, current sensor 6, connected in series with the measuring electrode 4, unit 7 then-30 measures the current between them, according to

ka, unit 8 of the comparison, the first input of which is connected to the current setting device 7, the second input of which is connected to the high voltage source 5 of the measuring device 9. The measuring electrode 4 can move in space due to the coordinate clamps 10 and 11.

The device works as follows.

In the cuvette 1, filled with dielectric liquid 2, placed the controlled product 3. The measuring electrode 4 is immersed in the dielectric liquid 2 and set at a fixed distance from the surface of the controlled product 3. The measuring electrode 4 is fixed with the help of coordinate latches 10 and

which determine the degree of roughness by comparing the obtained values of this current with its values on the corresponding calibration curves, characterized in that, in order to improve the accuracy and resolution of the measurement, the monitored product and the measuring electrode are pre-immersed in a dielectric fluid.

2. A device for monitoring the surface of electrically conductive products, comprising a high voltage source, a measuring electrode, a current meter, a recording unit connected to the output of a current meter, a high voltage source and a current meter connected in series with it

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If it differs from the required radius of rounding of the product 3, the comparison unit 8 generates a signal proportional to the difference between the signals of the current setting device 7 and the current sensor 6:

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current value at the required rounding radius; current value at actual rounding radius at a given location.

The error signal M can be measured either directly by the measuring device 9, or it can be used in information recording systems.

Claims (2)

Invention Formula 1. A method of controlling the surface of electrically conductive products, comprising applying a high voltage direct current voltage between the surface of the product and a measuring electrode installed at a fixed distance from it and which determine the degree of roughness by comparing the obtained values of this current with its values on the corresponding calibration curves, characterized in that, in order to improve the accuracy and resolution of the measurement, the monitored product and the measuring electrode are pre-immersed in a dielectric fluid. 2. A device for monitoring the surface of electrically conductive products, comprising a high voltage source, a measuring electrode, a current meter, a recording unit connected to the output of a current meter, a high voltage source and a current meter connected in series with it 0 11. After applying a high voltage measuring electrode and monitored direct current voltage from a direct current source 5 between the measuring electrode 4 and the controlled electrically conductive product 3, the current flowing in this circuit is measured. The current setting device 7 generates a signal proportional to the radius of rounding of the surface. This signal is compared with the current sensor 6 signal. five A product, characterized in that a measuring cell with a dielectric fluid is introduced into it, the current meter is made in the form of a current setting device, a current sensor and a comparison unit, the first input of the latter is connected to the output current setting device, the second input of the comparison unit is connected to a high source A product, characterized in that a measuring cell with a dielectric fluid is introduced into it, the current meter is made in the form of a current setting device, a current sensor and a comparison unit, the first input of the latter is connected to the output current setting device, the second input of the comparison unit is connected to a high source 3-1474452 voltage and through the current sensor - to the current setting device, the measuring electrode is made in the form of conductive sha vie le i J, mkA 1.2 1.0 0.8 V OD 0.2 t, of a ball with a radius g corresponding to the condition where R is the radius of rounding of the side surface of the product, i Tolerance field 1 mm Fie.2