SU1298266A1 - Device for setting thickness of electroplating - Google Patents

Abstract

The invention relates to equipment for monitoring electroplating parameters. The purpose of the invention is to increase the accuracy of coating and to expand the range of covered areas. This is achieved by the introduction of new units and functional links, which allow direct control to set the bath code (coating material), current output, area and thickness of the coating. The device contains a galvanic bath 1, a current source 2, a switch .3, a current sensor 4, an electricity quantity meter 5, which consists of a voltage converter 6 - frequency, a current output correction circuit 7, a bath code block 8, a square block 9, measuring thickness, control circuit 11. Block 9 square is connected between the output of the meter 5 amount of electricity and the input of the gauge 10 thickness. Switch 3 is connected between current source 2 and current sensor 4. The output of the control circuit 11 is connected to the input of the switch 3. The output of the current sensor 4 is connected to an electricity meter 5, the output of which is connected to a square unit 9. Increasing the coating accuracy and expanding the range of covered areas is achieved by introducing into this device a block of area, switch, control circuit. 3 hp f-ly, 1 ill. (L to CD oo y O5 a

Description

The invention relates to equipment for monitoring the parameters of electroplated coatings and can be used to set the thickness of electroplating and the consumption of precious metals during their electrochemical deposition. The purpose of the invention is to increase the accuracy of coating and expand the range of covered areas, -

The drawing shows the functional diagram of the device.

The device for setting the thickness of electroplated coatings contains a galvanic bath 1 to which a current source 2, a switch 3 and a bath current sensor 4, made in the form of a shunt, are connected to the serial circuit. The electricity quantity meter 5 connected to the current sensor 4 output consists of successively switched on. Converter 6 voltage - frequency, current output correction circuit 7 and bath code block 8, to the output of meter 5 of electricity copy, square block 9 is consecutively connected thickness gauge 1O and control circuit 11, the coating thickness meter 10 is provided with a blocking input connecting an IBM to the output of the control circuit, the synchronizing output of which is connected to the installation inputs of the bath code block 8 and the pl block show mercy.

The third output of the pulse control system 11 of the one-shot 18, is connected to the control input of the switch 3. The bath code block 8 contains a reversible counter 12c by presetting the counter capacity, the output of which is connected to the one-shot 13 input, the bath code setting device 14 is connected to informational the inputs of the reversible counter 12, To the first

Zero counters gauge 10 thickness and removes the block, allowing the passage of pulses from the block 9 square. Through the galvanic bath Q and accordingly through the current sensor 4 begins to flow current. From the sensor 4, the analog signal is fed to the input of the converter 6; the voltage is the frequency, the output frequency is coh

Zero counters gauge 10 thickness and removes the block, allowing the passage of pulses from the block 9 square. Through the galvanic bath Q and accordingly through the current sensor 4 begins to flow current. From the sensor 4, the analog signal is fed to the input of the converter 6; the voltage is the frequency, the output frequency is coh

the input of the logic element 2 and 15 is connected to the output of the one-shot 13, and is proportional to the current of the bath 1. That at the same time is the output of the Pulses from the converter 6 received from the meter 5 of the quantity of electricity. The second input of the logic element is the installation input of the bath code block 8. The output of the logic element 2 and 15 is connected to the input and is fed to the input of the current output correction circuit 7. Its principle of operation is based on passing for one working cycle only that part of the pulses, which corresponds to the current output value set on the setting unit 23. At the initial time, corresponding to the zero state of the counting record of the reversible counter 12, Area Block 9 is executed similarly to unit 8 bath code and contains a reversible counter 16 with a pre-j ka 20, in the counter 21 is recorded the code of the credential installation of the capacity of the counter of the current output and at its output ka, Unit 17, square, one-pass transfer, and therefore flax, and on the tretor 18 and the logical element 2and 19. the input of the logical element 22, the circuit 7 of the correction of the current output is CO - there is a potential of a logical unit.

Holds a decade counter 20 with a phase-pulse presentation of information whose output is connected to the pre-set input of a reversible counter 21 with a pre-set counter capacity and with the second. the input of the logic element G 22 the first input of which is connected to the input of the decade counter 20 and to the input of the current output circuit. The current output adjuster 23 is connected to the information inputs of the reversible counter 21, the transfer output of which is connected to the third input of the logic element ZI 22. The output of the current correction circuit 7 is connected to the output of the logic element 22 and to the counting input of the reversible counter 21.

Device Works as follows.

When the device starts up, the control circuit 11 generates an inverse pulse at its synchronization output, which through logic elements 2I 15 and 19 enters the inputs of the presetting of reversible counters 2 and 16, while recording the bath progress and the area of the parts to be covered, installed on the corresponding units 14 and 17. In addition, the control circuit 11 generates a signal to turn on the switch 3 and with a delay of 2-3 times longer the meter of the thickness gauge 10 and removes the lock, allowing extending therein pulses from block 9 square. Through the galvanic bath and, accordingly, through the current sensor 4 begins to flow current. From the sensor 4, the analog signal is fed to the input of the converter 6; the voltage is the frequency, the output frequency is coh

is proportional to the current of bath 1. Pulses from the converter 6 come

is proportional to the current of bath 1. Pulses from the converter 6 come

are input to the circuit 7 correction of the current output. Its principle of operation is based on passing for one working cycle only that part of the pulses that corresponds to the current output value set on the setpoint 23. At the initial moment of time corresponding to the zero state of the counterAt the output of the ten-day counter 20, and therefore, at the input of the prerecord the counter 21 and at the second input of the logic element 22 there is also the potential of the logical unit. Therefore, the pulses from the converter 6, coming to the first input of the logic element 22, pass through it and arrive at The output of the circuit 7 and the countdown input of the reversible counter 21. When the reversible counter 21 counts the number of pulses recorded in it from the setter23, its logical transfer level appears at the output of the transfer output, which prohibits the passage of pulses through the logical element 22. Consequently, the output of the circuit the pulses stop. At this time, the decade counter 20 continues counting.

When it counts the number of pulses equal to its capacitance, a logic zero level appears at the output of counter 20, which, having entered the pre-recording input of the reversible counter 21, again takes the current output code. At the same time, the output level of the counter 21 appears at the logical unit level, which permits the passage of pulses through the logic element to the reversible counter 21 and to the output of the circuit 7. Then the whole cycle equal to the capacity of the ten decade counter 20 is repeated.

Thus, if the capacity of the decade counter 20 is 1000 pulses, and the counter 21 records the number 900, which corresponds to a current output of 90.0%, for one cycle of 1000 pulses through the current correction circuit 7 of current output unit 8 The bath code passes only 900 pulses. The time interval during which the blocking of logic element 22 takes place compensates for the current efficiency of the process of electrochemical metal deposition in the bath. Next, the pulses from the current output correction circuit 7 are fed to the input of the reversible counter 12 of the bath code block 8. At the initial moment of time (when the device is started), the bath code is recorded in the reversible counter 12, which determines the coefficient of recalculation of the counter depending on the parameters of the applied metal, the transducer 6 and the current sensor 4.

The recalculation factor of the counter 12 is determined by the fact that the pulse period at the output of the bath code block 8 is proportional to the quantum of the amount of electricity passing through the bath and necessary for applying 1 micron of this type of coating on O, 1 dm area. The conversion factor of counter 12 (for a shunt of 75 mV) is determined from the expression

 K.ji: l.

where K is the conversion factor;

d is the density of the coating metal, g / cm;

f is the nominal frequency of the converter;

c is the electrochemical equivalent of the coating metal, g / Ah;

Claims (3)

I is the rated current of the shunt, A. When the reversible counter 12 counts a predetermined number of pulses, the logic zero level appears at its transfer output. On a single vibrator 13, a pulse begins to form with a logic zero level, which appears through the logic element 2 and 15 at the pre-recording input of the reversible counter 12. Thus, the bath code is again recorded in the meter 12 and the logic unit appears at its output . Then the whole cycle repeats. Consequently, at the output of block 8 of the bath code, pulses are generated, the period of which is equal to the time it takes for the quantum of the amount of electricity required to apply 1 µm of this type of coating to 0.1 dm of the area of details. The pulses from block 8 of the code arrive at block 9 square. The principle of operation of both units is the same, with the only difference that an area code is recorded in the reversible counter 16, which is set on the area gauge .17 before starting work. Thus, at the output of block 9, pulses appear, the follow-up period of which is equal to the time it takes for a quantum of quantity of electricity to pass through the bath required to apply 1 µm of the coating to the entire area of the parts to be coated. The thickness gauge 10, having calculated the pulses received from the area unit 9 and corresponding to the predetermined thickness of the coating, outputs a signal to the control circuit 11, which blocks the passage of pulses to the thickness gauge 10. At the same time, the control circuit 11 outputs a signal to the control input of the switch 3, which breaks the current circuit of the bath 1. At this, the electroplating process ends. The use of the proposed device allows setting and controlling the thickness of any electroplated coatings with a sufficiently high accuracy when working with an unstabilized current source of the bath and obtaining batches of parts with the same thickness of the coating. The accuracy of setting the thickness of the coating f5 of the accuracy of the coating and the expansion of the known device is the rhenium range of the covered areas, from (-5) - (2.2)%. The decrease in the charge of the electrochemical cell during the week is 5.6%, which is vyziono supplied with a block of space connected between the output of the electricity quantity meter and the input, necessitating a daily correction meter thickness gauge, a switch, and switching on its charge between current source and measurement instrumentation equipment. com bath current, and control circuit. The probability mean value of the output of which is connected to the control of the thickness of the coating for the proposed device, determined by the 25th move of the coating thickness meter, with Student's t-distribution for a probability of 0.99 is in the range of (-1.28) - (0.2)%. Thus, the application of the proposed device allows an increase in the accuracy of electroplating thickness, the minimum area of the coated products is 0.1 dm, and the upper limit is determined by the capacity of the area block counter. In the known device, it is possible to change the area only by 36% of the nominal value determined by the integrator charge unstable over time. In addition, the proposed device provides the task of setting the current output with discreteness. The unit 40 contains an area setter, a logical element 2I, a one-shot and a reversible counter with presetting the capacity of the counter, the pre-recording input of which is co0, 1% in the range of 0.1 - 99.9%, while while the known limit of correction is 45 with the output of logical elements up to 4.5% with a resolution of 0.5%. 2I, and the information input - with an extended range of current output correction significantly expands the functionality of the proposed by the movement of the area setter and the transfer of the nose - to the input of the one-shot, the inverse output of which is connected to by the movement of the square adjuster and the transfer output - with the input of the one-shot, the inverse output of which is connected to devices, as it allows the application of the first input of a logic element to it at various electrochemicals 2I and the output of the area block, during this process, in which the coefficient of the second input of the logic element 2I Current output rate reaches 30%. It should also be noted reliability, simplicity and convenience when working with the proposed device, since it allows you to directly set the bath code (coating material), current output by the controls. connected to the installation input of the block area. 3. The device according to claim 1, characterized in that the bath code block comprises a bath code master, a logical element 2I, a one-shot area and thickness of the galvanic coating. Invention Formula 1. A device for setting the thickness of electroplated coatings containing an electroplating bath, an amount of electricity meter, a coating thickness meter, a current source and a galvanic bath sensor connected to the input of an amount of electricity meter, characterized in that, in order to increase accuracy of coating and expansion of the range of covered areas it is equipped with an area block connected between the output of the electricity quantity meter and the input of the input to the switch, and the input is connected to the meter. The electricity quantity meter contains series-connected voltage-frequency converter; the current and the bath code block, the installation input of which, together with the installation input of the area block, is connected to the synchronizing output of the control circuit, and the coating thickness meter is equipped with a blocking input connected to the control circuit lockout output. 2. The device according to claim 1, characterized in that a block of area contains a square adjuster, a logical element 2I, a one-shot and a reversible counter with presetting the capacity of the counter, the pre-entry input of which is set up by the one-shot input, invert the output of which is connected to the first input of the logic element 2I and the output of the block area, while the second input of the logic element 2I connected to the installation input of the block area. 3. The device according to claim 1, characterized in that the bath code block comprises a bath code master, a logical element 2I, a one-shot 7 - - 12 and a reversible counter with presetting the capacity of the counter, the counting input of which is connected to the input of the code block, the preliminary recording input — with the output of logic element 2I, the information input is connected to the output of the setter of the bath code, and the transfer output — to the input of the single-vibrator; which is connected to the first input of the logic element 2I and the output of the code block, while the second input of the logic element 2I is connected to the installation input of the code block. A. The device according to claim 1, characterized in that the circuit is eight The current output response contains a decade counter, a reversible counter with presetting of the meter capacity, a current output setpoint and a logic element of the GI, the first input of which is connected to the input of the correction circuit and the input of the decade counter, the second input - to the output of the decade counter, the third input is with the transfer output of the reversible counter, and the output is with the input of the counting return of the reversible counter and with the output of the correction circuit, while the output setpoint is connected to the information Ion inputs of the reversible counter ..