JPS5824517B2 - Single-sided processing equipment for continuous coil alumite using DC electrolysis - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-sided processing apparatus that processes only one side of continuous coil alumite using DC electrolysis.

FIG. 1A is an explanatory diagram of the flow of current e' in the conventional double-sided alumite electrolytic cell and the formation of an anodized film (alumite film) H/ on the object (sheet) S'.

Normally, the workpiece S' connected to (1) is placed in an electrolytic solution (→In the situation where it is sandwiched between each of the connected electrodes F1, the current e'
flows as shown by the arrow, but in this case, current concentration occurs at the ends and the produced coating also becomes thicker at the ends.

However, in the case of plating, the distance between the workpiece and the electrode should be pear-shaped (1
) and (→ are exchanged, but the electrolytic phenomenon is the same.

Figure 1B shows how the current e' flows when the workpiece S' is sandwiched between the H pear-shaped electrode F and (a) the pear-shaped electrode F2, and the alumite film H generated on the surface of the workpiece S'. ' is an explanatory diagram.

This case is the same as the electrode arrangement in the electrolytic cell of the present invention, which will be described later, but shows a case where countermeasures such as mask separators and slit plates are not taken.

In other words, the current e' generated between the electrodes in (c) detours around the object to be treated S' and flows through the electrolytic solution (leak current - loss current) e / is very large, and the electrolytic efficiency is becomes extremely low, and almost no film is formed on the end face portion of the surface of the object to be treated.

This phenomenon becomes a determining factor in the relationship between the specific resistance value depending on the type of electrolyte and the polarization voltage value required on the surface of the object to be treated.

Many of the electrolytes used in alumite treatment have good conductivity, and loss current is usually likely to occur.

Figure 1C1 The first diagram is a method that has been conventionally used for the electrolytic characteristics of the polar arrangement shown in Figure 1B, and it is a method to provide an obstruction to the current that tends to concentrate at the edge of the object to be treated. FIG. 2 is an explanatory diagram of the case where unevenness in film formation is eliminated by adjusting the current density.

That is, in FIG. 1C, when (1) the pear-shaped pole F2 is arranged across the workpiece Sp during plating, the effective working surface of the electrode F2 is adjusted by the shielding plate M1 of the U-shaped M surface, and , the concentration phenomenon (e/ is the flow of generated current) is alleviated by covering the end of the object Sp to be processed.

In the first drawing, the cross-sectional shape of the shielding plate M2 is changed to a Y-shape, and the purpose is to achieve the same effect as the former M1.

When this kind of thing is applied to the pole arrangement shown in Fig. 1B, in order to reduce the above-mentioned e',
If there is almost no sliding contact between the end of p and the shielding plate M1 or M2, the current e will flow from the gap (the gap between the shielding plate and the object to be processed).
′ will leak, and a continuous dividing plate will be required on the back side (from the outside to the tank wall), and leakage current will also occur in the direction of the layer in front of the continuous coil, so additional preventive measures are required. be.

For this reason, high efficiency cannot be obtained with a type of electrolytic cell in which both (l-)H poles are disposed facing each other in the same electrolytic cell.

Therefore, the main conventional method has been to arrange a power supply tank and an electrolytic tank in the direction of the front layer of a continuous coil as shown in FIG.

The disadvantages of the currently used continuous coil alumite single-sided processing apparatus will be explained with reference to FIGS. 1, 2, and 3.

The processing equipment is power supply tank A/(filled with electrolyte 1')
, inter-tank B' electrolytic tank C/ (filled with electrolyte 2')
3' is a slit plate, 4' is a double-sided power supply electrode installed in the electrolytic solution 1', 5' is two single-sided electrolytic electrodes installed in the electrolytic solution 2', and S' is Al or A1. The workpiece S' is an alloy coil sheet, and the workpiece S' is passed between the power supply electrodes 4' by a pair of push rolls 6' through the slits in the slit plates 3' on both sides of the tank, and then transferred to the electrolytic electrode 5'. It is transported through the underside of the .

f' is the first electrolytic power source, which is connected to the feeding terminal 4' and the first electrolytic electrode 5' by wiring a', and ■' is the second electrolytic power source, which is also connected to the feeding terminal 4' and the next electrolytic electrode by wiring b'. electrolytic electrode 5'
is connected to.

The flow of current during anodic oxide film treatment (alumite treatment) by DC electrolysis is as follows: Electrolytic power supply I', ■' → Wiring a', b' → Power supply terminal (A)
4' → Electrolyte 1' → Processing object S' in power supply tank A' → Processing object S' in electrolytic tank C' → Electrolytic solution 2' → Electrolytic electrode 5' →
The flow goes from wiring a', b' to electrolytic power source r/, n/, and the processed material S' is connected to power source I/, n/ (1) in power supply tank A'.
While passing between the power supply electrodes 4', which are pear-shaped, the power is pear-shaped (1), and is introduced into the electrolytic cell C' through the inter-tank tank B' (current-carrying middle part), and the electrolytic solution 2' An alumite film H/ (see Fig. 3) is intended to be formed only on the upper surface of the object to be treated S' while passing through the lower surface side of two pear-shaped single-sided electrolytic electrodes 5' installed inside. It is.

The basic conditions for forming an alumite film are met in that the object to be treated S' is (1) in the electrolytic solution 2' and the counter electrode, that is, the electrolytic electrode 5' is pear-shaped (→) to form an alumite film. However, in this case, due to single-sided treatment (single-sided coating), the electrolytic electrode 5' is also placed only on one side (in this case, the upper side) to perform the electrolytic treatment, and at this time the current is applied to the third side.
The current flows in the direction of arrow e' shown in the figure, but as shown in Figure 2, some current also flows from the back side (lower side), which does not require treatment, into the electrolyte as a leak current, as shown by f'. Therefore, a part of the lower surface is also electrolytically treated as shown in H'', resulting in (a) partial double-sided treatment (formation of an alumite film).

Furthermore, in the current apparatus shown in FIGS. 1 to 3, the current necessary for alumite treatment flows through the object S' in the vertical direction (parallel to the center of the treatment line) and reaches the electrolytic cell C'. , a film is formed in the same electrolytic cell C'.

The power supply tank A' portion and the electrolytic cell 07 portion are arranged in tandem, and a strip plate 3' or an inter-tank tank B' portion is provided to separate both A' and e'.

(b) That is, since the current apparatus is basically vertically divided parallel to the processing center, there are drawbacks such as an increase in space due to the tank structure.

The present invention aims to eliminate the above-mentioned drawbacks of the current device. A slit plate is provided in close proximity to the counter electrode in the traveling direction of the strip-shaped object to be processed, and a mask separator is arranged in a plane so as to be continuous from the slit and parallel to the edge portions on both sides of the object to be processed. The front and back sides of the object to be processed are separately surrounded and partitioned, and the gap between the groove at the tip of the mask separator and the ears on both sides is about 1 nm, and by making the partitions electrically independent, the electrolytic current flowing inside the object can be controlled. The current flows from front to back, and leakage current is prevented using a slit plate and a mask separator, so that only one side of the continuous coil alumite is processed.

The present invention will be explained below based on the embodiments shown in FIGS. 4 to 9.

First Embodiment (See FIGS. 4 to 1) FIG. 4 is a schematic vertical sectional front view of the device of the present invention, and FIG. 5 is a side sectional view taken along the Y-Y line in FIG. The power supply tank and the electrolytic tank coexist (there is no inter-tank tank, and one electrolytic tank C is filled with electrolyte 10.

S is A [or A1 alloy coil sheet, 11
, 12 is a push roll for the object to be processed S, 13 is a slit plate, and 14a and 14b are power supply electrodes (1) and 15a that are separated by the slit plate 13 and the mask separator 2021 and immersed in the electrolytic solution 10. , 15b are electrolytic electrodes (→) installed in isolation in the same way as the feeding electrodes, and the feeding electrodes 14a and the electrolytic electrodes 15a and the feeding electrodes 14b and the electrolytic electrodes 15b are opposite electrodes, respectively, and the slit plate 13 is The object to be processed S passes between the slit portion and the counter electrode.

The slit plate 13 provided for the counter electrode is installed very close to the slit part and the object S to be processed, with a gap of several mm or less, and continuously extends from the slit part to both sides of the object S to be processed. A mask separator 20, 21 (extending in a planar manner to the tank wall) is arranged parallel to and close to the end ear.

The gap between the edges on both sides and the thickness of the object to be processed is approximately 1 m.
The above mask separator 2
0.21 are arranged in a planar manner, and the front and back sides of the object to be processed S are divided separately surrounding the electric field of each electrode, and by making the sections electrically independent, the electrolytic current flowing inside the object to be processed S can be reduced. a slit plate 13 installed close to the object to be processed, which allows leakage current to flow in the front and back directions, and leaks from both end edge portions (left and right lateral directions) of the object to be processed (portions shown in FIG. 5); This is also prevented by mask separators 20 and 21 installed close to the ears on both sides.

■ is the first electrolytic power source, ■ is the second electrolytic power source, and the same power source I
, l are power supply terminals 14a and 14b via wiring A22B and C.
and the electrolytic electrodes 15a,
15b.

The order of energization to form an anodized film by DC electrolysis is as follows: Electrolytic power source 1, L → Wiring A 2 ports, C → (1) Power supply terminal 14
a, 14b → Electrolytic solution 10 → Lower surface power supply side of the processed object S → Inside the processed object S (towards the upper electrolytic side) → Electrolytic solution io−+=
Electrolytic electrodes 15a, 15b-+wiring 2.

E, I → Electrolytic power supply ■, H becomes.

That is, the electrolyte 1 of the electrolytic cell C is removed by the first push roll 11.
When the workpiece S that has entered the electrolytic solution 10 passes between the first lower (a) power supply electrode 14a installed in the same electrolytic solution 10 and the upper (→electrolytic electrode 15a), the workpiece S enters the lower (i) ) Power supply pole 14a
(A) Pear-shaped (current flows in the direction of arrow e)
The object to be treated S is subjected to initial electrolytic treatment as shown in FIG.
An alumite film H is formed on the upper surface side of (
b) While passing between the power supply electrodes 14b and the electrolytic electrodes 15b, the alumite film H gradually increases in thickness due to the same power supply electrolytic action as described above.

If the above state continues, and as described above regarding the current device, some current flows as a leakage current from the back side (lower side) of the object S that does not need to be processed, and H'' in Fig. 3 is added to the part. However, in the present invention, in the left and right directions of the object to be treated, as shown in FIG. 5 and FIG. Mask separators 20 and 21 are arranged so as to be in contact with the right and left end ears of the workpiece S to be pushed into the 12 side at a slight interval and to surround the respective ears, and also in the longitudinal direction of the front layer. As shown in FIG.
Since the front and rear electrodes of a and 14b are separated by a mask separator in a state where they are surrounded so as to be electrically independent (a state where they are not mutually conductive through the electrolyte), it is possible to separate them from the back surface of the object S. It is possible to prevent leakage current from leaking to the upper surface side through the left and right ends, and an alumite film is formed only on the upper surface of the object S.

Second Embodiment (See Figures 8 and 9) This embodiment is the same as the first embodiment in that the power supply tank and the electrolytic tank are co-located. The alumite treatment is carried out by repeatedly bending and meandering in the vertical direction.

Four power supply terminals 14a, 14b, 14c, and 14d are immersed in the electrolytic solution 10 in one electrolytic cell C in parallel in the vertical direction at equal intervals, and each power supply terminal is connected to a wire. Electricity from the first and second electrolytic power sources I, 1 or 6 (-1-) is connected through the power source.

Electrolytic electrodes 15 are provided between the power supply electrodes 14a and 14b, 14b and 14c, and 14c and 14d adjacent to the pomelo, respectively.
a, 15b, and 15c are inserted and installed as shown in the figure, and each of the electrolytic power sources I.

■Electricity from (→) is called.

The object to be processed S is transferred by the push roll 11 between the counter electrodes formed by the power supply electrodes and the electrolytic electrodes.

The order of energization, the alumite treatment action, the relationship between the slit plate 13 and the object to be processed S, the relationship between both end edges and the mask separator, and the prevention of leakage current by the slit plate 13 and the mask separator 2021 are the same as in the first embodiment. Same as in case.

In short, in the present invention, in an electrolytic cell filled with an electrolytic solution, a power supply electrode for supplying electricity (1) and an electrolytic electrode for supplying electricity (to) are arranged as opposite poles in parallel planes, and the same opposite electrodes are provided. A slit plate is disposed close to each of the counter electrodes in the direction of movement of a continuous band-shaped object passing through the gap, and the gap between the slit portion and the object to be processed is within several mm, and partitioning is performed.
Continuously from the slit section to the edges on both sides of the object to be processed,
The gap between the tip groove part and the ear part in the thickness direction of the workpiece is approximately 1
The degree of the gap and the depth of fitting into the ear part are related to the accuracy of the threading function.The mask separator is arranged in a flat shape and the front and back of the workpiece are separately connected to each electrode. A single-sided processing device for continuous coil alumite using direct current electrolysis, characterized in that the electric field is divided to surround it, and the divided sections are made electrically independent so that the electrolytic current flowing inside the object to be treated flows in the front and back directions. be.

That is, in the present invention, (1) compared to the current device, the power supply tank and the electrolytic tank coexist and are electrically separated from each other with the object to be treated sandwiched between them; Current flows from the back side of the object to the front side (in the lateral direction).

In other words, the current passing through the object to be processed is in the horizontal direction (from the back to the front).
Therefore, the current conduction distance is the shortest and follows.

Therefore, the loss due to electrical resistance is minimized.

(11) Since electricity does not flow vertically (parallel to the center of the processing line) through the object to be processed, a large current can be passed easily and without any trouble.

That is, high-speed electrolysis becomes easy.

(iii) As mentioned above, since the power supply tank and the electrolytic cell are located together, that is, the power supply tank portion and the electrolytic cell portion are overlapped, the tank structure space is reduced.

6v) +'-1-) The slit part of the slit plate disposed for the counter electrode of the power supply electrode and the H electrolytic electrode and the object to be processed are disposed close to each other within several rnrIt to partition the gap, and
The mask separator disposed on both side edges of the workpiece has a gap between its tip grooves and the both side ears of the workpiece in the thickness direction of about 1 mm, and a depth of fitting into the ears. The front side and the back side of the object to be treated are separated by separate plates in different potential fields ((-+-) side, (to) side), so the back side (lower side) which does not require treatment is separated by a separate plate. ), a part of the current can be prevented from flowing in a detour into the electrolyte as a leak current, and a film is absolutely formed at the potential field (back side of the object to be treated) of (1). Instead, the coating will be applied to only one surface.

[Brief explanation of drawings]

Figure 1A is an explanatory diagram showing how current flows in the electrolytic cell of double-sided alumite and the condition of the alumite film on the object to be treated, and Figure 1B is the (c) pear-shaped electrode d field electrical connection of the object to be treated. An explanatory diagram of alumite III generated on the surface of the workpiece, Figure 1C
Figure 1 and Figure 1 are methods that have been conventionally used for the electrolytic characteristics of the polar arrangement shown in Figure 1B, respectively, when a shielding plate is provided at the end of the object to be treated to eliminate unevenness in film formation. FIG. Figures 1 to 3 show the current single-sided alumite treatment equipment, with Figure 1 being a schematic longitudinal sectional front view, Figure 2 being a side sectional view taken along line X-X in Figure 1 in the direction of arrows; FIG. 3 is a partially enlarged longitudinal cross-sectional view of FIG. 1 showing the direction of current flow and the formation of an alumite film. 4 to 7 show a first embodiment of the present invention, FIG. 4 is a schematic longitudinal sectional front view, FIG. 5 is a side sectional view taken along the Y-Y line in FIG. 4, and FIG. Figure 6 is an explanatory diagram showing the direction of current flow and the growth status of the alumite film in the present invention, which is a partial enlargement of Figure 4. Figure 7 is an enlarged partial view of Figure 5, showing the installation of the leakage current prevention member of the present invention. It is a drawing for explaining the current flow direction and the alumite film formation state in the case. 8 and 9 show a second embodiment of the present invention, FIG. 8 is a schematic longitudinal sectional front view, and FIG. 9 is a diagram cut along the Z-Z line in FIG. 8 and viewed in the direction of the arrow. FIG. In the figure, S: object to be treated, C: electrolytic cell, 10
... Electrolyte, 14a, 14b, 14c, 14ct-
Power supply electrodes, 15a, 15b, 15cm electrolytic electrodes, 13.
...Slit plates, 20, 21...Mask separators that work together with the slit plate 13 to prevent leakage current.

Claims (1)

[Claims] 1 In an electrolytic tank filled with electrolyte solution, the power supply electrode (g) that carries electricity and the electrolytic electrode that carries electricity (→) are placed as opposite poles in parallel planes, and the electrodes pass between the opposite electrodes. In the traveling direction of the continuous strip-shaped object to be processed, a slit plate is disposed close to each of the opposite electrodes so that the gap between the slit portion and the object to be processed is within the quantity, and a partition is provided continuously from the slit portion. Place the tip grooves on both side edges of the workpiece so that the gap between the ears and the thickness of the workpiece is approximately 1 mvt, and the depth of fitting into the end ears is related to the accuracy of the threading function. By arranging mask separators in a planar manner and dividing the front and back sides of the object to be treated so as to surround the electric field of each electrode, and making the divided sections electrically independent, A single-sided processing device for continuous coil alumite using direct current electrolysis, characterized in that the electrolytic current that flows through the processed material flows in the front and back directions.