SU773153A1 - Device for galvanic plating thickness control - Google Patents

Description

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The invention relates to thickness measurement and can be used in the electrical industry when measuring the thickness of a galvanic coating during its deposition.

The closest technical solution to the present invention is a device for controlling the thickness of the electroplated coating, which contains 10 recurrent screen converters, a reference and an electrode witness placed in them, a master oscillator for powering the converters and a measuring circuit jji .- 15

A disadvantage of the known device is that the witness electrode is in the measuring transducer during the entire coating period, while 20 due to the shielding effect of the transducer coils, the electrode witness is covered unevenly, which leads to a decrease in measurement accuracy, reduces the quality of the product, 25 leads to marriage.

 The purpose of the invention is to improve the quality of control by discrete measurement of the increment of the thickness of the cover.

The goal is achieved by the fact that the device is equipped with an electromagnet, the measuring circuit is made in the form of a comparison unit, a clock pulse generator, a storage unit, a filter and a power amplifier, the inputs of the gate unit are connected to the outputs of the reference unit and the clock pulse generator, the filter is connected to to the storage unit, and the second output of the clock generator is connected to an electromagnet intended for the introduction of a witness electrode into the converter.

FIG. 1 is a block diagram of the device in FIG. 2 - temporary diagrams for the operation of the device.

The device for controlling the thickness of the galvanic coating contains a master oscillator 1 for powering the eddy current screen transducers 2 and 3, between coaxially arranged coils 4, 5 and 6, 7 of which are placed, respectively, the standard 8 and the witness electrode 9.

The measuring coils 4 and 5 of these transducers are connected to a measuring circuit consisting of a comparison unit 10, a storage unit 11,

one input connected to the output of the unit 10 of the comparison, and the second to the generator 12 clock pulses, the second output of which is connected through a power amplifier 13 electromagnet 14, on the cortex of which is placed the electrode witness 9. The output of the atomizing unit 11 is connected to the filter 15.

The device works as follows.

The alternating electromagnetic field in eddy current transducers 2 and 3 is excited with the help of master oscillator 1. In this case, transducers 4 and 5 in the transducers are induced by these fields to emf.

The signals Ug (16) of the reference transducer 2 and 1) (17) of the transducer 3, placed in a galvanic bath, are fed to the input of the comparator unit 10, the sum signal (18) appears at the output

U; {U2 + and,

which is fed to the input of the storage unit. 11. The second input of the storage unit 11 receives a signal from a generator of 12 clock pulses, which also goes to the amplifier, 13, which controls the electromagnet 14. At times (16) of time tg (including pulse), the power amplifier 13 connects the electromagnet 14 and the witness electrode 9 Bodit between the generator and measuring coils b and 7 of the measuring transducer 3. This impulse tg arriving at the second input of the unit 11, connects the first input of this unit. The process of measuring the thickness of the coating on the elec- tde de Svidele 9 begins. It lasts until the switching-off pulse tg (19) arrives at the second input of the storage unit 11 and at the input of the amplifier 13 "of the chip. At this time, electromagnet 1 is turned off and the probe 9 is output from converter 3. In memory unit 11, the first input is disconnected and a steady signal appears on its exit and, (20), corresponding to the coverage value before a disconnect pulse ly arrives. This constant signal U is present at the output of the memory of block 11 in the time interval t,., - t, i.e. to the occurrence of a dego inclusive pulse t. With the appearance of the next inclusive pulse t

The measurement measurement is repeated. Continuing these operations at intervals of time T, we obtain the function Ug (20) at the start of the storage unit 11 of the device (Fig. 2). This step function is fed to the input of the filter 15 .. From the output of the filter 15, a continuous signal and (21) is fed to an indicator (not shown) and is used to form a signal at the end of the process.

According to the invention, a witness electrode is inserted between the coils of the measuring transducer for short periods of time. Most of the time he is out

5, the coating process is uniform. The magnitude of the coating on the witness electrode corresponds to the magnitude of the coating on the parts. This simplifies the process.

0 measurement, eliminating the operation of adjusting measurement results, improve measurement accuracy, which leads to an increase in the quality of products, labor productivity and reduced

marriage

Claims (1)

Invention Formula Q - A device for controlling the thickness of a galvanic coating containing eddy screen converters, a reference and electrode witnessed in them, a master oscillator for powering the converters and a meter. This scheme is characterized in that, in order to improve the quality of control, by discrete measurements of the increment of the coating thickness, it is. equipped with an electromagnet, the measuring circuit is made in the form of a comparison unit, a clock pulse generator, a storage unit, a filter and a power amplifier, the inputs of the storage unit are connected to output 5 of the comparison unit and a clock generator, the filter is connected to the storage unit by an input, and the second generator output clock pulses are connected to an electromagnet designed to introduce a witness electrode into the transducer. Sources of information taken into account in the examination 1. USSR author's certificate No. 326254, cl. C 25 D 17/12, 1969 (prototype). R and 16 Ui w. 17 18 U 20 Us 21 nineteen S T tete