JPH0124148Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating barrel plating device that is provided with a gas supply pipe that reaches near the deepest part of the barrel.

[Prior Art] A rotating barrel plating device is used when plating a large number of small parts. The barrel used in this plating device is a polygonal cylinder with an open top, often a hexagonal cylinder, and a rotating shaft fixed on the central axis is supported horizontally or diagonally. It can be rotated around this. This barrel has a number of holes through which the plating solution can freely pass.

For example, in the electroless plating method, the surface of the object to be treated is activated and placed in a barrel, and then the barrel is immersed in a plating solution in a plating tank.
Then, the metal ions in the plating solution are reduced,
Metal is deposited on the surface of the workpiece and plating is applied. At this time, the object to be processed constantly moves in an attempt to move to the lowest point while its circumferential surface rolls inside the rotating barrel, and its surface comes into contact with the plating liquid evenly.

However, in this conventional rotary barrel plating device, the movement of the workpiece at the deepest part of the barrel becomes slow, and the surfaces of the deposited workpiece come into contact with each other. For this reason, the plating liquid becomes trapped in the small gap between them, and the circulation of the plating liquid on the surface of the object to be treated becomes insufficient. Therefore, the rate of metal precipitation slows down in that area.

When the metal ions in the plating solution are reduced and deposited on the surface of the workpiece, hydrogen gas is generated. Gas concentration becomes extremely high. This will strengthen the reducing action of the plating solution itself, and the metal ions will not only reach the surface of the object to be treated, but also
It also begins to be reduced in the plating solution, producing metal particles therein. These metal particles become nuclei and further promote self-decomposition of the plating solution, making the plating process difficult.

In order to solve these problems, it has already been proposed to place an air supply nozzle near the bottom of the plating tank to constantly feed air, agitate the bubbles, and release hydrogen gas. has been done. However, in this case, almost no air enters the barrel, so it has little effect on the plating liquid inside the barrel.

Therefore, a device has been proposed in which a plurality of air supply pipes are fixed at fixed angles in a direction parallel to the axis of rotation on the inner circumferential surface of a rotating barrel, and air bubbles are sent from there into the inside of the barrel (1973- Publication No. 10414).

[Problems to be Solved by the Invention] However, when the air supply pipe is fixed to the inner periphery of the barrel, the air supply pipe also rotates as the barrel rotates, and constantly rotates inside the barrel. Since the air bubbles quickly float in the plating liquid, the air bubbles released at the top of the barrel have little effect on the plating liquid inside the barrel. For this reason, only the air bubbles emitted from the lowest one of the several air supply pipes can actually supply air bubbles to the workpiece, and the air bubbles emitted from the other air supply pipes can be effective. Air bubbles are released needlessly. Moreover, the burden on the pump that supplies air bubbles to the air supply pipe is heavy. Furthermore, since the air supply pipe passes through the bottom of the barrel intermittently, it is not possible to constantly supply air bubbles from the bottom of the barrel, and the effect is not sufficient in this respect as well.

The present invention was developed to solve the above-mentioned problems with conventional rotary barrel plating equipment, and by constantly releasing air bubbles from the bottom of the barrel, fresh plating liquid is always supplied to the workpiece. At the same time, the purpose is to eliminate so-called fatigue of the plating liquid and prevent its self-decomposition.

[Means for Solving the Problems] In other words, in order to achieve the above object, the gist of the means adopted in the present invention is to obliquely rotate the rotation axis of a cage-shaped barrel having a large number of through holes that do not allow the object to pass through. Then, in a rotating barrel plating device in which the barrel is immersed in a plating liquid and a drive source is connected to the rotating shaft of the barrel, the barrel is immersed in the plating liquid, and the barrel is immersed near the bottom of the barrel along the deepest part of the inner peripheral surface of the barrel. This rotating barrel plating device is characterized in that it is provided with a gas supply pipe that reaches the bottom of the barrel, a spout is opened in the vicinity of the deepest part of the barrel of the gas supply pipe, and a gas supply device is connected to the base end of the gas supply pipe. .

[Operation] In the above-described rotary barrel plating device, the rotation axis of the basket-shaped barrel is tilted, the barrel is immersed in the plating liquid, and the barrel is immersed in the plating solution along the deepest part of the inner peripheral surface of the barrel near the bottom. The gas supply pipe has a gas supply pipe reaching the bottom of the barrel, and the gas supply pipe has a spout near the deepest part of the barrel, so even if the barrel rotates, the gas supply pipe does not rotate and the gas spout at the tip of the gas supply pipe does not rotate. is always located near the bottom of the barrel. Therefore, bubbles can be continuously and steadily ejected from the ejection port into the barrel. Therefore, stirring of the object to be processed in the barrel by the bubbles, release of hydrogen gas, etc. can be performed very effectively.

[Example] Hereinafter, a specific example of the present invention will be described with reference to the illustrated embodiment. A barrel 2 is immersed in a plating liquid 13 filled in a plating tank 1. As already mentioned, this barrel 2 is used for processing objects a, a...
A large number of through holes 14, 1 are large enough not to pass through.
The plating liquid 13 is allowed to pass between the inside and outside of the cage, such as a hexagonal cylindrical shape.

In the device according to the invention, the barrel 2 is supported obliquely. That is, a rotating shaft 3 is attached to the central axis of the barrel 2, and is rotatably supported at an angle of about 45 degrees. And this rotating shaft 3
is connected to a transmission shaft 6 through joints 4 and 5, and further, this transmission shaft 6 is connected through a gear reduction mechanism 7 to a drive source 8 such as a motor.

Further, in such a rotary barrel plating device, the barrel 2 is provided with a gas supply pipe 9 that reaches the vicinity of the deepest part of the barrel 2, and the gas supply pipe 9 is provided with jet ports 10, 10, .

In the illustrated embodiment, the gas supply pipe 9 passes through the lid 11 of the plating tank 1, and its tip reaches the deepest part of the barrel 2 along the circumferential surface of the barrel 2.
A plurality of jet ports 10, 10, . . . are provided along the circumferential surface of the barrel 2 near the tip.

On the other hand, on the base end side of the gas supply pipe 9, a gas supply device 12 such as a pump for sending air to the jet ports 10, 10, . . . side is provided.

Note that this point is exactly the same even when the barrel 2 is supported horizontally. That is, the tip of the gas supply pipe 9 is inserted horizontally into the barrel 2 along the circumferential surface of the barrel 2, and the injection port 1 is inserted along the circumferential surface of the barrel 2.
0, 10... are opened.

In this device, activated objects a, a... are placed in a barrel 2, the barrel 2 is rotated,
When plating the objects a, a, . . . , an oxygen-containing gas such as air is fed into the vicinity of the deepest part of the barrel 2 from the gas supply device 12 side through the gas supply pipe 9.

The gas ejected from the ejection ports 10, 10... rises in the plating liquid 13 from the deepest part of the barrel 2, but at this time, the plating liquid 13 at the bottom part of the barrel 2 where the objects a, a... have accumulated is stirred, so
Circulation of the plating liquid 13 is promoted, and fresh plating liquid 13 is supplied between the objects a, a, . . . .

At the same time, the hydrogen gas accumulated between the objects a, a... is expelled, and dissolved oxygen in the plating liquid 13 increases, so that the plating liquid 13 is easily reduced, so-called fatigue of the plating liquid 13. It will be resolved. Thereby, self-decomposition of the plating liquid 13 can be prevented.

[Effects of the invention] As explained above, according to the invention, air bubbles can be continuously and steadily supplied from the bottom of the barrel through one gas supply pipe 9, and the air bubbles can be wasted with a small output pump. It can be expected to be highly effective without being released into the body. That is, it is possible to supply fresh plating liquid 13 to the surfaces of the objects a, a... to be processed, and also to prevent the so-called self-decomposition of the plating liquid 13, so that the objects a, a... can be properly cleaned. , and can be plated efficiently.

[Brief explanation of the drawing]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory diagram of a rotary barrel plating device showing an embodiment of the present invention in the drawings. 2... Barrel, 8... Drive source, 9... Gas supply pipe, 10... Spout, 12... Gas supply device,
13...Plating liquid, 14...Through hole, a...Object to be treated.

Claims (1)

[Scope of utility model registration request] A rotary barrel plating system in which a basket-shaped barrel having a large number of through holes that do not allow objects to pass through is immersed in a plating liquid with its rotating shaft tilted, and a driving source is connected to the rotating shaft of the barrel. In the device,
A gas supply pipe that reaches near the bottom of the barrel is provided along the deepest part of the inner circumferential surface of the barrel, and a spout is opened in the part of this gas supply pipe near the deepest part of the barrel. A rotating barrel plating device characterized by connecting a gas supply device to a rotary barrel plating device.