SU1242547A1 - Device for automatic control of current in electroplating bath - Google Patents

Description

2, the apparatus according to claim 1, characterized in that the measuring organ is made in the form of a pulse generator, a key controlled by a comparator, a pulse counter, the pulse generator being connected via a key to a pulse counter,

3. The device according to clause .1, which is the measure that the invention relates to electroplating and can be used to automatically control the current density in the electroplating bath.

The purpose of the invention is to improve the quality, accuracy of control and regulation of the current due to the objectivity of the automatic measurement of the surface of the product.

FIG. 1 shows a block diagram of the device in FIG. 2, a diagram of the measuring organ, the first variant i in FIG. 3, the same, the second variant.

The block diagram of the device contains a bridge circuit, in two adjacent arms of which equal impedances are equal (for example, resistors 1 and 2), and in the other two galvanic baths 3 and 4 (one with the product, the other with the product model), between the arms of the bridge Included are current generator 5 and measuring unit 6 connected to the inputs with an additional electrode 7 and the bridge impedance connection point, and outputs to a digital-to-analog converter 8 and switch 9. The outputs of switch 9 are connected to plates 10 having reference surfaces a an additional entrance is connected to the shoulder of the bridge. The output of the D / A converter 8 is connected to the input of a regulated power supply 11, the outputs of which are connected to the parts 12 and the anode 13, which are placed in a galvanic bath 14,

The measuring body 6 in the first embodiment (FIG. 2) is made in the form

The body is designed as an adder, a scale factor sensor, a control pulse generator, the scale factor sensor is connected to the adder via a key controlled by a comparator, and the pulse generator is connected to an adder and scale factor sensor.

counter 15 pulses, working generator 16, connected to it via key 1 7, controlled by comparator 18,

In the second embodiment, the measurement unit is implemented in the form of a scale factor sensor 19 connected via a switch 20 controlled by a comparator 21, with an adder 22 connected to a control pulse generator 23 connected to the scale factor sensor 19, and the inputs of the comparator 21 are inputs measuring organ, and

the outputs of the adder 22 - the outputs of the measuring body (Fig, 3),

The device works as follows.

After the workpieces 12 are loaded into the bath 14, the process of measuring their surface is performed. The generator 5 operates as a primary current for the galvanic bath 14, while the measurement result is not

the location and configuration of the bath electrodes.

When the bridge is unbalanced, the measuring body 6 controls, via its outputs, the switch 9, which connects various reference surfaces 10

to the bridge scheme. The process continues until the balance of the bridge is reached. Then, at the output of the measuring body 6, a code is established for the surface area of the parts to be machined, 9 which simultaneously goes to the digital-to-analog converter 8, from the output of which a voltage proportional to the surface of the parts to be processed is fed to the input of the controlled current source 11.

At the end of the process of measuring the surface of the workpiece 12, the device automatically switches to the operating mode. Adjustable power supply 11 sets the operating current in the bath 14, corresponding to the surface of the workpiece 12.

In the course of further work, the device periodically measures the surface of the parts 12 to be treated and corrects the mode of operation of the regulated power supply 11.

The work of the measuring body (per

The second option) is as follows.

When the bridge is unbalanced, the comparator 18 permits the passage of pulses from the generator 16 through the key 17 to the counter 15, The process continues until the bridge is balanced, while the comparator 18 closes the key 17 and the code corresponding to the surface of the workpiece is set in the counter.

The work of the measuring body 6 (the second option) is as follows.

When the bridge is unbalanced, comparator 21 allows the passage of signals from

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5 10

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20

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The scale factor sensor I9 through the keys 20 to the inputs of the adder 22, where they are summed up by the action of the generator 23 of control pulses. 5 At the same time, the signals of the scale factor sensor 19 correspond to the true value of the reference areas and can be semi-automatically corrected at regular intervals. The scale factor sensor signals 19 are passed to the inputs of the adder until the bridge balance arrives, while the comparator 21 closes the key 20 and in the adder 22 sets the number corresponding to the surface area of the parts to be processed.

Thus, the device automatically determines the surface of the workpiece 12, sets the operating current corresponding to this value, automatically maintains the current density regardless of the configuration of the parts and their location in the electroplating bath 14.

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The proposed device will automate the processing of products, improve the working conditions of the operator.

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FIG. g

Output

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Editor L.Gratillo

Compiled by S. Ponomarev Tehred L. Blainck

Order 3671/28 .- Circulation 615 Subscription

ZNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow,, Raushsk nab ,, d. 4/5

PCPMchvodstvenno-printing company, Uzhgorod, st. Project, 4

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Proofreader L. Pilipenx

Claims (3)

1. A DEVICE FOR AUTOMATIC CURRENT REGULATION OF A CURRENT VALVE IN A GALVANIC BATH, containing an adjustable current source and a bridge circuit, in adjacent shoulders of which are: impedances of equal magnitude, and in the other two galvanic baths, one with the product, the other with the product model and switch, and between the different shoulders of the bridge included a signal generator and a measuring body, characterized in that, in order to improve the quality, accuracy of control and regulation of current due to the objectivity of automatic measurement of the surface of the product, it equipped with an additional electrode installed in the bath, connected to the measuring body, the outputs of which are connected to the switch, and the product model is made in the form of a set of reference surfaces. 910 7 3 Fig. 1 2, The device according to π. 1, characterized in that the measuring body is made in the form of a pulse generator, a key controlled by a comparator, a pulse counter, and the pulse generator is connected via a key to a pulse counter. 3. The device according to claim .1, characterized in that the measuring body is made in the form of an adder, a sensor of scale factors, a generator of control pulses, the sensor of scale factors connected to the adder through a key controlled by a comparator, and the pulse generator is connected to the adder and sensor scale factors.