JPH05271999A - Device for preventing spark in electroplating line - Google Patents

Abstract

PURPOSE:To prevent the continuous generation of sparks and to improve the quality of a plated body. CONSTITUTION:A voltage between a material to be plated 3 and an electrode 1 and a current flowing between the material 3 and the electrode 1 are detected and when the voltage and the current device from respective prescribed values, the generation of the spark between the material 3 and the electrode 1 is detected by a spark detecting means 10. When the generation of the spark is detected, the current in a plating vessel generating the sparks is reduced by a current regulating means 20. Thus, the continuous generation of the sparks is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark prevention device for an electric plating line, which is provided with a plurality of plating tanks and continuously performs plating.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of an electroplating line, showing one plating tank. A plating solution is stored in the plating tank, and an electrode 1 and a conductor roll (hereinafter, referred to as a roll) 2 are arranged in the plating solution. The coil 3 which is the object to be plated is placed on the roll 2 and is rotated at a predetermined speed in the arrow (a) direction by the rotation of the roll 2. In this case, the coil 3 moves below the electrode 1.

A rectifier 4 is provided between the electrode 1 and the roll 2.
Are connected, and the “+” electrode is connected to the electrode 1 and the “−” electrode (earth potential) is connected to the roll 2. Thereby, the electrode 1 acts as an anode and the coil 3 acts as a cathode.

With this structure, when a voltage (hereinafter referred to as a plating voltage) is applied between the electrode 1 and the coil 3 while the coil 3 is moving, the electrode 1 and the coil 3 are separated from each other. The coil 3 is electroplated by the electrolysis action between the two.

However, if the coil 3 has a defective shape, the tension of the coil 3 is low, or the flow velocity of the plating solution changes, the coil 3 is bent or flaps. When such bending occurs, the coil 3 comes into contact with the electrode 1 and a spark is generated between the coil 3 and the electrode 1.

When this spark occurs, an oxide film adheres to the coil 3 or a trace called an arc spot remains. This reduces the quality of the coil 3,
Moreover, the electrode 1 is also damaged.

[0007]

As a method of detecting such spark occurrence, for example, Japanese Patent Laid-Open No. 1-219191.
Although there is a technique described in the publication, the configuration of the detector and the detection method are not clear in this technique.

As a method for preventing sparks, for example, there is a technique described in Japanese Patent Laid-Open No. 170498/1987, in which the surface of the electrode is partially covered with an insulator having good corrosion resistance and wear resistance. Is listed. However, even if the electrode 1 is covered with an insulating material, the coil 3 is damaged by contact with the coil 3. Therefore, an object of the present invention is to provide a spark prevention device for an electric plating line that can prevent sparks from being continuously generated and improve the quality of a body to be plated.

[0009]

SUMMARY OF THE INVENTION In the present invention, a material to be plated is continuously penetrated into a plurality of plating tanks, and in each plating tank, the object to be plated and the electrode are arranged at a predetermined interval, and In a spark prevention device for an electric plating line for supplying electric power between a plated body and an electrode to plate a body to be plated, a device for supplying power between the body to be plated and the electrode, for example, a voltage of a rectifier and these covered bodies. A device for supplying electric power between the plating body and the electrode,
For example, a spark detecting means that detects a current flowing through the rectifier and detects that a spark has occurred between the plated object and the electrode when the voltage and the current deviate from the respective predetermined values,
A spark preventing device for an electric plating line, which includes the current adjusting means for reducing the amount of current in the plating tank in which the spark is detected by the spark detecting means, to achieve the above object.

Further, according to the present invention, the object to be plated is continuously penetrated into a plurality of plating tanks, and the object to be plated and the electrode are arranged at a predetermined interval in each plating tank. In a spark preventive device for an electroplating line for supplying electric power between a substrate to be plated and a device to supply electric power between the substrate to be plated and an electrode, for example, the voltage of a rectifier and the substrate to be plated and the electrode. A device that supplies power between the device and the device, for example, a current that flows in a rectifier, and a spark that detects that a spark has occurred between the plated object and the electrode when these voltage and current deviate from respective predetermined values. In the plating tank in which a spark is not generated by the detection means, a current adjusting means for reducing the current amount in the plating tank in which the spark is detected by the spark detecting means, and the current amount reduced by the current adjusting means. And a plating adjusting means for increasing the flow rate is a spark prevention device for electroplating lines to be achieved the above objects.

[0011]

With the provision of such means, the voltage and current of the rectifier are detected, and when these voltages and currents deviate from the respective predetermined values, the spark detecting means causes the spark between the plated object and the electrode. Occurrence detected. When the occurrence of this spark is detected, the current adjusting means reduces the amount of current in the plating tank where the spark has occurred. This prevents continuous sparking.

Further, according to the present invention, when the voltage / current of the rectifier deviates from a predetermined value, the spark detection means detects the spark generation between the object to be plated and the electrode, and the current adjusting means plating the spark. The amount of current in the cell is reduced. Along with this, the amount of current in the plating tank in which no spark is generated is increased by the plating adjusting means by the amount of the decreased current.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a block diagram of a spark prevention device for an electroplating line.

The spark detecting means 10 comprises a coil 3 and an electrode 1.
Between the coil 3 and the electrode 1 when the plating voltage and the plating current flowing therethrough deviate from the respective predetermined values. I have.

Specifically, there are provided a voltage detector 11 for detecting the output voltage of the rectifier 4 at regular intervals and a current detector 12 for detecting the output current of the rectifier 4 at regular intervals.
Among them, the output terminal of the voltage detector 11 is connected to one input terminal of the comparator 14 via the differentiator 13. Further, a voltage setting device 15 is connected to the other input terminal of the comparator 14, and a plating voltage setting value for detecting the occurrence of spark is input.

The output terminal of the current detector 12 is the differentiator 1
It is connected to one input terminal of the comparator 17 via 6.
A current setting device 18 is connected to the other input terminal of the comparator 17, and a plating current setting value for detecting the occurrence of spark is input.

The comparators 14 and 17 are differentiators 13 and 16 respectively.
When the voltage is low and the current is high, the differential signal is compared with each set value, and the high level signal is output when the differential signal level is higher than the set value level. An AND gate 19 is connected to the output terminals of the comparators 14 and 17, and the AND gate 19 outputs the high-level spark detection signal S.

Upon receiving the spark detection signal S, the spark current setting circuit 20 has a function as a current adjusting means for reducing the plating current amount in the plating tank in which the spark is generated. That is, the spark current setting circuit 20 has a function of sending the spark current setting value Q1 for reducing the plating current output from the rectifier 4 to the tank rectifier current calculator 30 when receiving the spark detection signal S. ing.

The spark detecting means 10 and the spark setting circuit 20 described above are provided for each plating tank, and are configured to send out the spark current setting values Q2 to Qn. Then, these spark current setting values Q2 to Qn
Are sent to each tank rectifier current calculator 30.

The tank rectifier current calculator 30 receives the spark current setting values Q2 to Qn to determine the plating tank in which the spark has occurred, and the rectifier controller 21 of the plating tank receives the spark current setting values. Q2 to Qn are passed as rectifier current setting values P2 to Pn, and sparks are not generated by the amount of the plating current reduced in the plating tank. For example, the plating current setting value in one plating tank is increased, and this increase is increased. It has a function as a plating adjusting means for sending the changed current set value as the rectifier current set values P2 to Pn. Next, the operation of the device configured as described above will be described.

When a plating voltage is applied between the electrode 1 and the coil 3 while the coil 3 is moving, the coil 3 is electroplated by the electrolysis action between the electrode 1 and the coil 3. ..

At this time, the voltage detector 11 detects the output voltage of the rectifier 4 in a constant cycle and outputs an electric signal corresponding to the detected voltage. This electric signal is differentiated by the differentiator 13, and the amount of change in the plating voltage is sent to the comparator 14 as a differential output. This comparator 4 compares the differential output with the plating voltage setting value, and outputs a low level signal if the level of the plating voltage setting value is lower than the differential output.

On the other hand, the current detector 12 detects the output current of the rectifier 4 in a constant cycle and outputs an electric signal corresponding to the detected current. This electric signal is differentiated by the differentiator 16, and the amount of change in the plating current is sent to the comparator 17. This comparator 7
Compares the differential output with the plating current setting value, and outputs a low level signal if the level of the plating current setting value is higher than the differential output.

In the above state, no spark is generated between the coil 3 and the electrode 1, and the AND gate 19
Outputs a low level signal. Therefore, each tank rectifier current calculator 30 sends the normal plating current set values P1 to Pn to the rectifier controller 21 of each plating tank.

However, when the coil 3 is bent or fluttered and the coil 3 comes into contact with the electrode 1 to generate a spark, the liquid resistance RE becomes zero and the load resistance becomes the coil resistance as shown in the equivalent circuit of FIG. And the resistance Rs peculiar to the equipment. Therefore, the plating voltage between the coil 3 and the electrode 1 is lowered as shown in FIG. 3, and the plating current amount is increased.

Therefore, when the plating voltage and the plating current are detected by the voltage detector 11 and the current detector 12, and their electric signals are sent to the differentiators 13 and 16, respectively, the differential outputs of the differentiators 13 and 16 are output. Is above each set value level. As a result, each of the comparators 14 and 17 outputs a high level signal, and the AND gate 19 outputs a high level spark detection signal S.

When the spark detection signal S is input to the spark time setting circuit 20, the spark time setting circuit 20 supplies the spark current setting value Q1 for decreasing the set plating current of the rectifier 4 to each tank rectifier current calculator 30. Send out.

Each tank rectifier current calculator 30 receives the spark current setting value Q1 to determine the plating tank in which the spark has occurred, and sends the spark current setting value Q1 to the rectifier controller 21 of the plating tank. It is sent as the set value P1.

The rectifier controller 21 receives the rectifier current set value P1 and limits the output current of the rectifier 4 by a predetermined current amount. As a result, the spark generated between the coil 3 and the electrode 1 is reduced.

Further, each tank rectifier current calculator 30 calculates the spark current setting value Q from the plating current setting value before spark generation.
1 is subtracted to obtain a reduced current amount, and this current amount is added to the plating current in, for example, one plating tank in which no spark is generated. Then, the rectifier current set value P2 of the increased plating current amount is sent to the rectifier controller 21 of the plating tank. As a result, the amount of plating adhered in the plating tank in which sparks have occurred is reduced, but plating is performed in the plating tank in which sparks are not generated by the amount of this plating adhesion. In FIG. 3, period T indicates the plating voltage and the plating current during the normal plating operation.

As described above, according to the above-described embodiment, the occurrence of spark can be detected promptly by detecting the changes in the output voltage and the output current of the rectifier 4, and the continuous occurrence of spark can be reliably prevented. In this case, the spark is generated when both the plating voltage and the plating current both deviate from the predetermined values, so that the reliable spark generation can be detected. or,
Although the amount of plating adhered in the plating tank in which the spark is generated is reduced, the amount of plating applied can be compensated for in another plating tank, and the quality of the plating is not deteriorated.

The present invention is not limited to the above-mentioned one embodiment, and may be modified within the scope of the invention. For example, although the plating current setting value is decreased due to the occurrence of sparks, the plating current setting value may be returned to the normal value again after a predetermined period has elapsed after the decrease. In addition, when supplementing the amount of deposited plating in the plating tank in which sparks have occurred, the deposited plating amount should be distributed among multiple plating tanks to compensate, that is, the plating current should be increased in each plating tank to perform plating. You can

[0033]

As described above in detail, according to the present invention, it is possible to provide a spark preventing device for an electric plating line which can prevent continuous sparks from being generated and can improve the quality of a plated object.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a spark prevention device for an electroplating line according to the present invention.

FIG. 2 is an equivalent circuit diagram of the device.

FIG. 3 is an operation timing chart of the device.

FIG. 4 is a block diagram of a conventional device.

[Explanation of symbols]

1 ... Electrode, 2 ... Roll, 3 ... Coil, 4 ... Rectifier, 10
... spark detecting means, 20 ... spark setting circuit, 30
… Each tank rectifier current calculator.

Claims (2)

[Claims] 1. A substrate to be plated continuously penetrates into a plurality of plating tanks, and the substrate to be plated and an electrode are arranged at a predetermined interval in each of the plating tanks. In a spark prevention device for an electroplating line that supplies electric power between and to plate the object to be plated, a voltage of a device that supplies power between the object to be plated and the electrode, and a voltage between the object to be plated and the electrode. Spark detection means for detecting a current flowing between and detecting that a spark has occurred between the object to be plated and the electrode when the voltage and the current deviate from respective predetermined values, and the spark detection means. An electric plating line spark prevention device comprising: a current adjusting unit that reduces the current amount in the plating tank in which a spark is detected. 2. The object to be plated is continuously permeated into a plurality of plating tanks, and the object to be plated and the electrode are arranged at a predetermined interval in each of the plating tanks. In a spark prevention device for an electroplating line that supplies electric power between and to plate the object to be plated, a voltage of a device that supplies power between the object to be plated and the electrode, and a voltage between the object to be plated and the electrode. Spark detection means for detecting a current flowing between and detecting that a spark has occurred between the object to be plated and the electrode when the voltage and the current deviate from respective predetermined values, and the spark detection means. Current adjusting means for reducing the amount of current in the plating tank in which spark is detected, and plating for increasing the amount of current in the plating tank in which no spark is generated by the amount of current reduced by the current adjusting means. Spark prevention device for electroplating lines, characterized by comprising a settling unit.