JP2914792B2 - Spark detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark detector for accurately determining a situation where a spark is likely to occur in a process of continuously electroplating a metal material and detecting a spark generation position of the metal material. Related to the device.

[0002]

2. Description of the Related Art Generally, in an electroplating facility for continuously electroplating a metal material with a constant current ,
The anode, which is the metal to be plated
The distance between the metal plate and the metal material to be plated must be kept constant. However, when the seam of the metal material passes, or when the metal material shakes, the change in the distance is unavoidable, and the voltage fluctuation between the plating cell and the metal material causes a spark, which damages the metal material. May be added.

[0003] In order to estimate the occurrence of the spark and to detect the location of a flaw attached to the metal material, there is an apparatus for predicting the occurrence of a spark from a voltage fluctuation between the plating cell and the metal material.

FIG. 3 is a block diagram showing the configuration of a conventional spark detector of this type together with a plating system.
In this figure, in order to electroplate the metal material 1, a pair of plating electrode rolls 3 presses and transports the metal material 1 from both sides, and energizes the metal material 1. Further, as viewed from the plating electrode roll 3, a pair of plating cells 4 are arranged at predetermined intervals on the upstream and downstream of the metal material 1 at a predetermined interval. The cathode of the plating power source 2 is a plating electrode roll 3
The anodes are connected to the plating cells 4 respectively. Thus, electroplating is performed by flowing an electrolytic current between the metal material 1 and the plating cell 4.

Here, when the metal material 1 is continuously fed, the distance between the plating cell 4 and the metal material 1 fluctuates due to the seam and thickness of the metal material 1 or fluctuations and the like. Occurs. At this time, since the voltage between the plating cell 4 and the metal material 1 also fluctuates, a plating voltage detecting means 5 for detecting a voltage between the electrodes of the plating power supply 2 is provided.
The fluctuation of the detection voltage e is monitored by the plating voltage monitoring means 6.

On the other hand, in order to detect the feed speed of the metal material 1, a speed detecting roll 7 which rotates in accordance with the movement thereof is provided, and the detected rotational speed r of the rotational speed detecting means 8 coupled to the speed detecting roll 7 is provided. The speed detecting means 9 is based on the
Is detected.

Therefore, the spark detecting means 10 determines that a spark has occurred if the fluctuation of the plating voltage e obtained by the plating voltage monitoring means 6 is a certain value or more, and determines a place where the metal material 1 may have been damaged. The traveling speed v of the speed detecting means 9
To predict from.

[0008]

The above-described conventional spark detection device can predict a spark generation location to some extent from fluctuations in plating voltage.

However, in the case where the metal material is damaged due to spark generation, the degree of the damage is slightly changed depending on the magnitude of the voltage and the time required for the change, that is, the change time, etc. There was a problem that had to rely on the inspection of.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to reliably detect the occurrence of a spark due to a voltage change between a metal material and a plating cell, and to determine the degree of the spark, that is, the metal. An object of the present invention is to provide a spark detection device capable of predicting the degree of scratches on a material.

[0011]

SUMMARY OF THE INVENTION The present invention provides a voltage detecting means for detecting a voltage between a plating cell of an electroplating facility for continuously electroplating a metal material and the metal material, and a voltage detecting means for detecting the voltage between the plating cell and the metal material. Voltage monitoring means for monitoring the obtained voltage fluctuation and obtaining the voltage level and the voltage fluctuation time; and fuzzy processing means for calculating the degree of spark generation using the voltage level and the voltage fluctuation time obtained by the voltage monitoring means as variables. A speed detecting means for detecting a moving speed of the metal material; a flaw of the metal material based on a degree of spark generation calculated by the fuzzy processing means and a speed of the metal material detected by the speed detecting means. And a spark detecting means for detecting the position and the position thereof.

[0012]

According to the present invention, the voltage fluctuation between the metal material and the plating cell is monitored, and the degree of spark generation is calculated by fuzzy processing from the voltage level and the voltage fluctuation time to determine that the metal material is damaged. The fuzzy processing uses the following method. (1) If the voltage applied between the metal material and the plating cell is large and the voltage fluctuation time is short, it is determined that the spark generation level is small. (2) If the voltage is slightly higher and the voltage fluctuation time is slightly shorter, it is determined that the spark generation level is slightly higher. (3) If the voltage is slightly lower and the voltage fluctuation time is slightly longer, it is determined that the spark generation level is slightly higher. (4) When the voltage is small and the voltage fluctuation time is long, it is determined that the spark generation level is large.

By performing such an operation, it is possible to reliably detect the occurrence of a spark due to a voltage change between the metal material and the plating cell, and to predict the degree of a flaw on the metal material.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention together with a plating system. The same elements as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. Here, a fuzzy processing means 11 is provided between the plating voltage monitoring means 6 and the spark detection means 10 to calculate the degree of spark generation using the voltage fluctuation level and the voltage fluctuation time as variables.

The operation of the embodiment constructed as described above will be described below, focusing on the fuzzy processing means 11.

First, a fuzzy processing rule and a membership function applied to the fuzzy processing means 11 are shown in FIG. In the figure, A11, A12, A21, A22, A31, A32, A41, A4
2, B1, B2, B3, B4 are membership functions, and R1, R2, R3, R4 are fuzzy processing rules. In this embodiment, a MIN operation method that minimizes fuzzy data is used.

The input (premise) for inference is the voltage e between the metal material and the plating cell and the voltage fluctuation time t, and the output (conclusion) is the degree of spark generation s. What is connected is the fuzzy processing rule R1,
R2, R3 and R4. -Assumption- e = e1 and
t = t1. -Fuzzy processing rule-R1: If e = A11 and t = A12, then s = B1.

R2: If e = A21 and t = A22, then s =
B2.

R3: If e = A31 and t = A32, then s =
B3.

R4: If e = A41 and t = A42, then s =
B4. -Conclusion- s = s1.

Next, a membership function for each fuzzy processing rule will be described. (1) Fuzzy processing rule R1 The membership function A11 indicates the magnitude of the voltage. The horizontal axis is the voltage applied between the metal material and the plating cell, and the horizontal axis is the degree of conformity that the voltage is large . The membership function A12 indicates the length of the voltage fluctuation time. The horizontal axis represents the time during which the voltage fluctuates, and the vertical axis represents the degree of matching that the time is short. The membership function B1 sets the degree of spark generation in the metal material. The fitness of the membership function A11 for a certain voltage is compared with the fitness of the membership function A12 for a certain voltage fluctuation time, and the membership function B1 is cut with the smaller fitness value. The s coordinate of the center of gravity of the figure of the cut membership function B1 is the degree of spark generation inferred by the fuzzy processing rule R1. (2) Fuzzy processing rule R2 The membership function A21 indicates the magnitude of the voltage. The horizontal axis is the voltage applied between the metal material and the plating cell, and the horizontal axis is the degree of conformity that the voltage is slightly higher. The membership function A22 indicates the length of the voltage fluctuation time. The horizontal axis is the time during which the voltage fluctuates, and the vertical axis is slightly shorter.
Is the degree of conformity. The membership function B2 sets the degree of spark generation in the metal material. The fitness of the membership function A21 for a certain voltage is compared with the fitness of the membership function A22 for a certain voltage fluctuation time, and the membership function B2 is cut with the smaller fitness value. The s coordinate of the center of gravity of the figure of the cut membership function B2 is the degree of spark generation inferred by the fuzzy processing rule R2. (3) Fuzzy processing rule R3 The membership function A31 indicates the magnitude of the voltage. The horizontal axis is the voltage applied between the metal material and the plating cell, and the horizontal axis is the degree of conformity that the voltage is slightly smaller . The membership function A32 indicates the length of the voltage fluctuation time. The horizontal axis is the time during which the voltage fluctuates, and the vertical axis is the time slightly longer.
Is the degree of conformity. The membership function B3 sets the degree of spark generation in the metallic material. The fitness of the membership function A31 for a certain voltage is compared with the fitness of the membership function A32 for a certain voltage fluctuation time, and the membership function B3 is cut with the smaller fitness value. The s coordinate of the center of gravity of the figure of the cut membership function B3 is the degree of spark generation inferred by the fuzzy processing rule R3. (4) Fuzzy processing rule R4 The membership function A41 indicates the magnitude of the voltage. The horizontal axis is the voltage applied between the metal material and the plating cell, and the horizontal axis is the degree of conformity that the voltage is small . The membership function A42 indicates the length of the voltage fluctuation time. The horizontal axis indicates the time during which the voltage fluctuates, and the vertical axis indicates the degree of adaptation that the time is long . The membership function B4 sets the degree of spark generation in the metal material. The degree of conformity of the membership function A41 to a certain voltage is compared with the degree of conformity of the membership function A42 to a certain voltage fluctuation time, and the membership function B4 is cut at the smaller value of the degree of conformity. The s coordinate of the center of gravity of the figure of the cut membership function B4 is the degree of spark generation inferred by the fuzzy processing rule R4.

Thus, the fuzzy processing rules R1, R2
, R3, R4, the membership functions B1, B2, B3, which indicate the degree of spark generation,
The s coordinate of the center of gravity of the figure of the membership function B0 created by superimposing B4 is the degree of spark generation of the metallic material inferred by the fuzzy processing rules R1, R2, R3, R4.

Subsequently, referring to FIG. 2 as an example, when the voltage e between the metal material and the plating cell is e1 and the voltage variation time t is t1, the degree of spark generation s of the metal material is s.
The process for finding 1 will be described. (1) Inference by the fuzzy rule R1 When the voltage e between the metal material and the plating cell is e1, the adaptability that the voltage obtained by the membership function A11 is large is ω1. When the voltage fluctuation time t is t1, the time obtained by the membership function A12 is short.
Goodness-of-fit of the stomach is zero. Therefore, the fuzzy rule R
There is no membership function which means the degree of sparking of the metallic material inferred by 1. (2) Inference by the fuzzy rule R2 When the voltage e between the metal material and the plating cell is e1, the degree of conformity that the voltage obtained by the membership function A21 is rather large is ω3. When the voltage fluctuation time t is t1, the fitness that the time obtained by the membership function A22 is slightly shorter is ω4. In this example, ω3
> Ω4, the membership function B2 is cut at the value of ω4, and the hatched portion of the membership function B2 becomes a membership function meaning the degree of spark generation of the metallic material inferred by the fuzzy rule R2. (3) Inference by the fuzzy rule R3 When the voltage e between the metal material and the plating cell is e1, the degree of conformity that the voltage obtained by the membership function A31 is slightly smaller is ω5. When the voltage fluctuation time t is t1, the fitness that the time obtained by the membership function A32 is slightly longer is ω6. In this example, ω5
Since <ω6, the membership function B3 is cut at the value of ω5, and the hatched portion of the membership function B3 becomes a membership function meaning the degree of spark generation of the metallic material inferred by the fuzzy rule R3. (3) Inference by the fuzzy rule R4 When the voltage e between the metal material and the plating cell is e1, the degree of conformity that the voltage obtained by the membership function A41 is small is zero. When the voltage fluctuation time t is t1, the time obtained by the membership function A42 is long.
Goodness-of-fit of the stomach is zero. Therefore, the fuzzy rule R
There is no membership function that indicates the degree of sparking of the metallic material inferred by (4).

As described above, in this embodiment, the hatched portions of the membership functions B1, B2, B3, B4 indicating the degree of spark generation of the metal material inferred by the fuzzy rules R1, R2, R3, R4. Are superposed on each other, the s coordinate of the center of gravity of the figure of the membership function B0 created by superposing the voltage e1 and the voltage fluctuation time t
In addition to the degree of sparking of the metal material at the time of 1, it is a predicted value of the degree of flaws that may have occurred on the metal material.

The membership function A1 shown in FIG.
1, A12, A21, A22, A31, A32, A41, A42, B1
, B2, B3, and B4 are adjusted when applied to the spark detection device, and their graphics can be changed as appropriate.

The membership function A1 shown in FIG.
1, A21, A31, and A41 are membership functions that indicate the magnitude of the voltage when the constant voltage is the maximum value.
The number can be added, and of course, the membership functions A12, A22, A32, and A42, which indicate the length of the voltage fluctuation time, can also be added.

[0028]

As is clear from the above description, according to the present invention, when a metal material is continuously plated with a constant current, the plating cell and the metal material are connected to each other due to the passage or shaking of the seam of the metal material. The magnitude of the voltage between them fluctuates,
If sparks occur between the plating cell and the metal material due to the occurrence of sparks and damage the metal material,
By determining the degree of spark generation from the magnitude of the voltage at that time and the voltage fluctuation time by a fuzzy processing method,
In addition to reliably detecting the occurrence of spark, it is possible to predict the degree of spark, that is, the degree of scratches on the metal material.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention together with a plating system.

FIG. 2 is an explanatory diagram showing a fuzzy processing procedure of a main element in order to explain an operation of one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional spark detector together with a plating system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal material 2 Plating power supply 3 Plating electrode roll 4 Plating cell 5 Plating voltage detecting means 6 Plating voltage monitoring means 7 Speed detecting roll 8 Rotation speed detecting means 9 Speed detecting means 10 Spark detecting means 11 Fuzzy processing means

Claims (1)

(57) [Claims] 1. A voltage detecting means for detecting a voltage between a plating cell of an electroplating facility for continuously electroplating a metal material and the metal material, and monitoring a fluctuation of the voltage detected by the voltage detecting means. A voltage monitoring means for obtaining a voltage level and a voltage fluctuation time, a fuzzy processing means for calculating the degree of spark generation using the voltage level and the voltage fluctuation time obtained by the voltage monitoring means as variables, and a moving speed of the metal material. Speed detecting means for detecting the degree of spark generation calculated by the fuzzy processing means, and detecting the degree of the flaw of the metal material and its position based on the speed of the metal material detected by the speed detecting means. A spark detection device comprising: spark detection means.