JPH0454758B2 - - Google Patents

Description

Detailed Description of the Invention <Technical Field> The present invention involves supporting and rotating a roll to be plated, such as a gravure plate-making roll, by immersing it in a plating liquid, and applying plating metal to a metal basket in the plating liquid. The present invention relates to a roll plating device that stores lumps, circulates plating liquid between a plating tank and a plating liquid regenerating device, and plies rolls to be plated.

<Prior art> In a conventional roll plating device, the distance between the metal basket containing the metal block to be plated and the roll to be plated is set to be quite large according to the maximum diameter of the roll to be plated. When plating rolls, current flows around the rolls, so the current density becomes low and plating takes time, so high-speed plating is desired. To perform high-speed plating, it is possible to increase the current density by increasing the voltage, but increasing the voltage increases power consumption, increases running cost, and requires a booster.
Furthermore, when the voltage is increased, a boundary layer of ions is generated on the surface of the roll to be plated, making it difficult to perform plating.

<Object of the invention> The present invention was devised in view of the above points, and
The current density can be increased without increasing the voltage, and the plating liquid with low fatigue can be supplied to the surface of the roll to be plated.It can be used at high speeds at the same voltage as before without creating a boundary layer of ions on the surface of the roll to be plated. It is an object of the present invention to provide a roll plating device that can perform plating and can also realize stronger high-speed plating without generating a boundary layer of ions even when an extremely high voltage is applied.

<Structure of the Invention> The present invention provides a plating tank, a plating liquid regeneration circulation device that collects and regenerates the plating liquid in the plating tank, and returns it back into the plating tank, and a plating liquid regeneration circulation device that is provided integrally with the plating tank or can be lifted and separated, and is used for plating. a roll chuck rotating means for supporting and rotating the end of the roll so that the roll is immersed in the plating solution;
In a roll plating device equipped with an unmelted metal basket installed in a plating tank and containing a plating metal lump, the lower half of the inside wall of the basket facing the roll to be plated has a maximum diameter when raised. It has a semi-cylindrical shape that can closely surround the roll to be plated, and is appropriately opened so that the plating liquid can circulate, and the upper half of the inner wall of the cage on both sides is
It is opened appropriately so that the plating liquid can flow, and the distance between the upper halves of the inner walls of the cage on both sides is larger than that of the roll to be plated having the maximum diameter, and the U
It has a groove-shaped cage interior space, and is installed so that it can rise and approach the roll to be plated, and the recycled plating liquid is directly injected onto the roll to be plated into the insoluble metal basket. It is characterized by being equipped with a plating liquid injection pipe.

Therefore, the end of the roll to be plated is supported and rotated so as to be immersed in the plating liquid, the plating metal lump is accommodated in an insoluble metal basket in the plating liquid, and the plating liquid is transferred to the plating tank and the plating liquid regeneration circulation device. By circulating the plating liquid between the plating liquid and plating the roll to be plated, by bringing the basket closer to the roll to be plated, the current density is increased without increasing the voltage, and the recycled plating liquid is transferred to the basket. By directly spraying the plating liquid onto the roll to be plated from the provided plating liquid injection pipe, the plating liquid with a low fatigue level can be supplied to the surface of the roll to be plated, and as a result, ions are released onto the surface of the roll to be plated. This makes it possible to perform high-speed plating without creating a boundary layer.

The above-mentioned plating liquid injection pipe has an ejection port formed long in the length direction of the roll so that the plating liquid is uniformly sprayed over the entire length of the roll to be plated. On the other hand, it is preferable that the injection ports are provided in a line parallel to the roll at the required position closest to the roll.

<Example> Hereinafter, an example of the roll plating apparatus of the present invention will be described with reference to FIG.

In this roll plating device, a pair of roll chuck rotating means 1 are provided on opposite sides of a plating tank 2, or the roll chucks R are mounted on the plating tank 2 so as to chuck the rolls R to form a cassette independent of the plating tank 2. A pair of side frames are provided at both ends of a lifting frame (not shown) to support the plating roll R horizontally at both ends, and the roll R is immersed in the plating liquid in the plating tank 2 and rotated. Then, the undissolved metal basket 3 with a U-groove interior space provided in the plating tank 2 rises and surrounds the lower half of the plating roll R in a non-contact manner, so that the plating liquid (not shown) is removed. The regenerated plating liquid is supplied from the regeneration circulation device through the flexible pipe 10 to the plating liquid injection pipe 4 provided in the insoluble metal basket 3.
4, and the regenerated plating liquid is directly injected onto the roll R to be plated from the plating liquid injection pipes 4, 4.

The insoluble metal basket 3 is connected to the positive power supply and serves as an anode electrode, and is made of, for example, punched titanium metal, or titanium rods are connected in parallel at narrow intervals so that the plating solution can freely flow. The lower half 3a of the inner side wall of the basket facing the roll to be plated is a high-precision roller that can surround the roll in a close state 1 to 2 mm away from the roll to be plated with the largest diameter when rising. The shape is semi-cylindrical, and the upper halves of the inner walls of the basket on both sides are 3b, 3b.
The distance between the rolls is larger than that of the roll R to be plated, which has the largest diameter, and it has a U-groove-shaped interior space that is open at both upper ends so that a lump of metal to be plated such as a copper ball can be input. It is the shape. The insoluble metal basket 3 is supported at both upper ends by a basket moving means 6 so as to be able to rise and approach the roll to be plated.

In the basket moving means 6, a pair of brackets 6a, 6a fixed to both ends of the upper part of the insoluble metal basket 3 are fixed to the upper ends of vertically movable rods 6b, 6b provided on the outer surface of both sides of the plating tank 2. The lower ends of the rods 6b, 6b are fixed to the vertically moving chains of the chain winding devices 6c, 6c provided adjacent to the rods 6b, 6b, and the lower sprockets of the chain winding devices 6c, 6c are integrated. A sprocket 6e provided on a transmission shaft 6d connected to the transmission shaft 6d is rotated by a drive source such as a motor or cylinder device (not shown).
The rod 6b is provided with biasing means 7.
This biasing means 7 is configured to bias the insoluble metal basket 3 upward using a spring or air pressure, and if the basket comes into contact with the roll without injecting the plating liquid, the sensor Even if the driving source of the basket moving means 6 is adjusted to stop, the biasing means 7 balances the reaction force of the plating liquid jet from the plating liquid injection pipe 4, and the basket moving means 6 is moved. It is designed to ensure a gap with the roll.

No matter what the diameter of the roll R for plating is, the drive to rotate the sprocket 6e detects the point in time when the gap between the plating liquid injection pipes 4, 4 and the inside wall of the basket and the roll becomes 1 mm. To automatically stop the source, a gap sensor such as a proximity sensor, a phototube switch, or a flow condition change sensor is provided to detect pressure or flow changes caused by direct injection of plating fluid onto the roll. (This sensor is not shown).

There are several plating liquid injection pipes 4 installed in the insoluble metal basket 3, which are branched at required equal intervals in the length direction of the roll from a header 8 provided so as to be held on the outside of the basket, and pass through the basket. The injection ports 4a are formed in a long strip shape in the length direction of the roll, and face the required position closest to the roll to be plated, and the plurality of injection ports 4a on one side are arranged parallel to the roll. Lined up in a row. The header 8 is connected to a plating liquid supply port 10 provided at the bottom of the plating tank 2 via a flexible tube 9.
is connected to a plating liquid regeneration and circulation device (not shown) and supplied with recycled plating liquid. Note that a stirring device is provided at the bottom of the plating tank 2 if necessary.

Next, to describe the action, when the plating liquid in the plating tank 2 has descended,
A roll R to be plated is suspended in a plating tank 2, and both ends are chucked by a roll chuck rotating means 1. After that, when the start switch is turned on, a plating liquid regeneration and circulation device (not shown) is activated, and the regenerated plating liquid is injected from the plating liquid injection pipe 4, and the liquid level of the plating liquid accumulated in the plating tank 2 rises. , the roll R for plating is completely immersed. Next, the roll chuck rotating means 1 is driven to rotate the roll R to be plated, and the insoluble metal basket 3 containing the copper balls is energized as an anode, and the roll R to be plated is energized as a cathode. Subsequently, the basket moving means 6 is activated, and the insoluble metal basket at the position 3' rises and approaches the plating roll R.
When the gap between the plating liquid injection pipes 4, 4 and the inner side wall of the basket and the roll becomes 1 mm, the rising is stopped by the action of the sensor. However, when the roll diameter shown by R is maximum, it stops at position 3 shown by the solid line, and
When the roll diameter indicated by R' is the minimum, it stops at the 3'' position.Thereby, even if the plating voltage is the same as before, the distance between the electrodes becomes extremely small, so the current density becomes high and high-speed copper plating is performed. Further, the plating liquid injection pipe 4 is close to the roll to be plated R and injects the recycled plating liquid directly onto the surface of the roll to be plated R.The ionic boundary layer that prevents plating that is generated on the surface of the roll to be plated is This occurs when the plating voltage is high or the plating liquid becomes fatigued, but in the present invention,
Since the recycled plating liquid is directly injected onto the surface of the roll R to be plated, the generation of ion boundary layers can be effectively suppressed even at high voltages, and the ion density can be substantially reduced by direct injection of the recycled plating liquid. go up to Since the injection ports 4a of the plating liquid injection pipe 4 are arranged in two elongated straight lines facing the rolls in parallel, the plating liquid directly injected onto the roll R to be plated is This is a highly reliable high-speed copper plater that sprays uniformly even when the roll is completely immersed, suppresses the formation of an ion boundary layer, and ensures a high and uniform ion density on the roll surface, resulting in uniform plating pressure. Can perform metsuki.

The plating liquid directly injected onto the roll R to be plated comes into contact with the copper balls housed in the insoluble metal basket 3 when passing through the basket and promotes ionization of the copper balls, so that Metsuki is guaranteed.

When plating is completed, stop spraying the plating liquid,
The basket moving means 6 operates and the insoluble metal basket 3 moves to 3'.
Open to lower to position. Thereafter, when the liquid level drops, the chuck release switch is pressed to release the chuck on the roll chuck rotating means 1, and the roll R to be plated is lifted above the plating tank 2.

<Effects of the Invention> As explained above, the present invention supports and rotates the end of the roll to be plated so as to immerse it in the plating liquid, and stores the plated metal lump in the metal basket in the plating liquid. In a roll plating device that circulates plating liquid between a plating tank and a plating liquid regenerating device to plate a roll to be plated, the inner space of the cage ascends a U-groove-shaped basket to surround the roll to be plated. In addition, since the plating liquid is sprayed directly onto the roll to be plated from the plating liquid injection pipe installed in the basket, the electrodes are closely spaced to prevent a boundary layer of ions from forming on the roll surface. It is possible to increase the current density without increasing the voltage, and high-speed plating can be performed at the same voltage as conventional methods. Furthermore, even when high voltage is applied, the direct injection of the plating liquid does not create a boundary layer of ions, and the ion density is reduced. Since the value increases, more powerful high-speed plating can be achieved.

In addition, if the injection ports of the plating liquid injection pipe are formed long in the length direction of the roll, and the injection ports are arranged in a line parallel to the roll, the injection ports will be uniformly spread over the entire length of the roll to be plated. The plating liquid can be injected, the generation of ion boundary layers can be evenly suppressed, and more reliable high-speed plating can be achieved.

In addition, if the surface of the metal basket opposite to the roll to be plated is sealed with a plate, the jet stream will flow through the gap between the basket and the roll to be plated after hitting the roll to be plated, effectively You can make a nice Metsuki.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional front view of the roll plating device of the present invention. R... Roll for plating, 1... Roll chuck rotating means, 2... Plating tank, 3, 3... Insoluble metal basket, 4, 4... Plating liquid injection pipe, 4a
. . . injection port, 6 . . . basket moving means, 10 . . . plating liquid supply port, and plating liquid regeneration and circulation device are not shown.

Claims (1)

[Scope of Claims] 1. A plating tank, a plating liquid regeneration circulation device that collects and regenerates the plating liquid in the plating tank and returns it to the plating tank, and a plating liquid regeneration circulation device that is provided integrally with the plating tank or can be lifted up and separated, and a roll to be plated is installed. In a roll plating device equipped with a roll chuck rotating means for supporting and rotating the end of the roll so as to be immersed in the plating liquid, and an insoluble metal basket provided in a plating tank and accommodating a plating metal lump, the insoluble metal basket is The lower half of the inner side wall of the basket facing the roll to be plated has a semi-cylindrical shape that can closely surround the roll to be plated with the largest diameter when rising, and is opened appropriately so that the plating liquid can flow. At the same time, the upper half of the inner wall of the cage on both sides is
It is appropriately opened so that the plating liquid can flow, and the distance between the upper halves of the inner walls of the basket on both sides is larger than that of the roll to be plated with the largest diameter, and has a U-groove-shaped interior space. The insoluble metal basket is provided with a plating liquid injection pipe so that the recycled plating liquid is directly injected onto the plating roll. A roll plating device characterized by: 2. In the roll plating device according to claim 1, the plating liquid injection pipe has an elongated injection port in the length direction of the roll, and is closest to the roll to be plated of the insoluble metal basket. A roll plating device in which one or more rows of injection ports are arranged in a line parallel to the rolls at required positions.