SU1654384A1 - Device for check deposited metal thickness - Google Patents

Abstract

The invention relates to electroplating and can be used in the mixing of coatings with precious metals. The purpose of the invention is to improve the accuracy of obtaining a coating of a given thickness by automatically correcting the composition of the electrolyte.

Description

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The device contains a current sensor 1, a voltage-frequency converter 2, a counter 3, a voltage-code converter 4, a self-powered counter 5, a code-voltage converter 6, a first comparison circuit 7, an adder 8, a unit 9 of square -... surfaces, unit 10 of thickness setting, unit of actual thickness 11, pulse generator 12, display unit 13, trigger 14 and second comparison circuit 15. The first input of the first comparison circuit 7 is connected to the output

converter 4, the second input of circuit 5, the swarm of the comparison circuit, setpoint adjusters 7 is connected with the output of the adder 8. Fat surface, actual thickness.

The second input of the second comparison circuit 15 is connected to the output of the converter 6, the output of the circuit 15 is connected to the display unit 13, the first output of the trigger 14 is connected to the setpoint 11 of the actual coating thickness, the output of which is 20

thickness and trigger setpoints, which allows to control electrolyte depletion, automatically correct it and reduce the error value in determining the mass of the deposited metal. 1 il.

The invention relates to electroplating and can be used in the coating of precious metals.

The purpose of the invention is to improve the accuracy of obtaining coatings of a given thickness by automatically correcting the composition of the electrolyte.

The drawing shows a functional diagram of the device.

The device contains a current sensor 1, a voltage-frequency converter 2, a counter 3, a code-voltage converter 4, a self-powered counter 5, a code-voltage converter 6, a comparison circuit 7, an adder 8 Ghlok 9 entering the surface area, block 10 input the thickness setting, the actual thickness input unit 11, the generator 12 impuses, the display unit 13, the trigger 14 and the comparison circuit 15

The output of current sensor 1 through the voltage-frequency converter 2 is connected to the input of counter 3 and to the first input of counter 5 with independent power supply. The output of the counter 3 via the second converter 4 is connected with the input of the comparison circuit 7 and with one of the inputs of the display unit 13. The output of the counter 5 through the first converter 6 is connected to the comparison circuit 15,

bind with one of the inputs of the adder 8 and with a generator of 12 pulses. The output of the latter is connected to the second input of the counter 5 with autonomous power. The second output of the trigger 14 is connected to the setpoint adjuster 10 of the thickness setting, and the first input of the trigger is connected to the output of the first comparison circuit 7. An increase in the accuracy of applying a coating of a given thickness is achieved by introducing into this device a second code-voltage converter, a display unit, a pulse generator, a second comparison circuit, surface area settings, and actual thickness.

thickness and trigger setpoints, which allows to control electrolyte depletion, automatically correct it and reduce the error value in determining the mass of the deposited metal. 1 il.

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with adder. 8 and with the display unit 13. The output of the adder 8 is connected with the second input of the comparison circuit 7 and with the display unit 13. The output of the comparison circuit 15 is connected to one of the inputs of the display unit 13. The outputs of blocks 9-11 are connected to the corresponding inputs of the adder 8. The first output of the trigger 14 is connected to the block 11 of actual thickness and to the generator 12 of pulses, the output of which is connected to the second input of the counter 5 with autonomous power. A second trigger output 14 is associated with a thickness setting adjuster 10. The output of the comparison circuit 7 is connected to one of the inputs of the trigger 14.

The current sensor is a shunt. The voltage-frequency converter 2, counters 3 and 5, and converters 4 and 6 to single-voltage are based on integrated circuits. At the input of the counter 5 with autonomous power supply, a two-input circuit ISH1 is installed. Circuits 7 and 15 comparisons are based on integral comparators. The adder 8 is made on the basis of an integrated operational amplifier. Blocks 9-11, respectively, surface area, thickness settings and actual thickness at the outlets

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Have gig, 1L in the form of DC voltage. Pulse generator 12 generates rectangular pulses with a frequency of, for example, on the order of 1 kHz. The display unit 13 contains measuring instruments for visual inspection of the output parameters. The trigger 14 is an integral RS trigger.

The device works (Yet following.

To calculate the amount of electricity required to apply a layer of coating thickness, the following model is used:

Q K, S + K ,, Z + K,

where Q is the amount of electricity required to achieve the thickness of the coated coating;

S is the surface area of the loaded parts;

- set thickness;

- the total amount of electricity that has passed through the electrolyte after the next correction of its composition;

K (, K, K - estimates of the coefficients of the regression model, calculated on the basis of the processing of experimental data.

Factor Q. reflects the depletion of the electrolyte in the galvanic bath.

The device works as follows.

Before loading parts into the bath, the operator, using blocks 9 and 10, enters into the device the surface area of the loaded parts and the required coating thickness setting. In the self-powered meter 5, a code proportional to the amount of electricity passed through the electroplating bath after the next correction of its composition is contained. Thus, at the output of the adder 8, prior to the process, a voltage is formed that is proportional to the amount of electricity that must pass through the electrolyte. The amount of electricity in the electroplating process is measured by the sensor 1 of the current of the converter 2, the voltage-frequency of the counter 3 and the second converter 4. With the calculated and

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Currently, the output signal of the comparison circuit 7 forms the corresponding process termination signal, which turns off the current source of the electroplating bath.

The correction of the device according to the actual thickness of the coating is carried out as follows. Taking into account that overlap in thickness is extremely undesirable, since it leads to useless metal loss, corrections; electrolyte IR should be done so that even in the first load after electrolyte correction, the thickness of the coating does not exceed its maximum value. Suppose you need to apply electroplating gold with a thickness of 3 microns. The first disconnection of the galvanic panel was made. The measurement shows that the tollcin coating is 2.6 microns. This value is entered into the device with the help of block 11. After giving the signal to the 5 Device Correction, the trigger 14 is switched to one state. In this case, the signal from the second output of the trigger 14, the block 10 is disconnected from the adder 8, and the signal from the first 0 output of the trigger 14 to the input of the adder 8 connects the block 11 of the actual thickness. The same signal starts the generator 12, the pulses from the output of which are fed to the second input of the counter 5 with autonomous power. The voltage at the output of the adder 8 is increased until the signal from the output of the comparison circuit 7 trigger 14 is returned to its original state. The device's correction is complete, and it automatically returns to the original mode.

Signaling Electrolyte correction is performed in the following 5 ways. The degree of electrolyte depletion is judged by the magnitude of the voltage at the output of the first transducer 6. Once this voltage reaches a certain critical value, 0 comparison circuit 15 triggers and issues an Electrolyte correction signal, which is fed to the automatic dispenser and the display unit.

Measurement of the actual thickness of the coating and correction of the characteristic of the device, taking into account the actual thickness, makes it possible to detect unacceptable depletion of the electrolyte and to promptly correct its composition.

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and improve the accuracy of the coating of a given thickness. The economic effect depends on the volume of loading and the intensity of operation of the plating bath.

Claims (1)

Invention Formula A device for monitoring the thickness of the precipitated methane containing a current sensor, a current-frequency converter, two counters, a comparison circuit, a code-voltage converter, an adder with the output of the current sensor connected to the converter input with the inputs of the first and second locks, the output of the second counter is connected to the input of the code-voltage converter, the output of which is connected to the input of the adder, characterized in that, in order to improve the accuracy of obtaining a coating of a given thickness by automatically correcting the composition of the electrolyte, it is equipped second code-voltage converter, display unit, pulse generator, five Q 5 the second comparison circuit, the surface area detector, the actual tpccine unit, the thickness setpoint sensor, the trigger, the output of the adder is connected to the second input of the first comparison circuit, and the inputs to the surface area setting unit, the thickness setting unit and the actual thickness setting unit, the first output trigger connection with a setter of the actual coating thickness and with a pulse generator, the second trigger output is connected with the setpoint of the thickness setting, the output of the first comparison circuit is connected to the first trigger input, output The pulse generator is connected to the second input of the second counter, and the inputs of the display unit are connected to the output of the first code voltage converter, the output of the second code voltage converter, the output of the adder and the output of the second comparison circuit, and the output of the first counter is connected to the input of the second converter code - voltage, the output of which is connected to the first comparison circuit.