JPH06272095A - Barrel plating device - Google Patents

Abstract

PURPOSE:To obtain the high productivity by making a workpiece and a dummy hard to be fitted into slit-shaped communicating holes provided in the peripheral wall of a barrel for making a plating liquid pass therethrough and improving the passing of the plating liquid into an out of the barrel. CONSTITUTION:The barrel 3, in the peripheral wall of which the communicating holes 7 are formed, is immersed in a plating bath tub 1 filled with the plating liquid. A rotary shaft 4 of the barrel 3 is a cylindrical body communicating the inside and outside of the barrel 3 and a spiral groove is formed on the inner peripheral surface. The barrel 3 is rotated with a motor 8 in the direction of flowing the plating liquid from the barrel 3 into the rotary shaft 4 by the spiral groove 6 within the rotary shaft 4. Consequently, the plating liquid in the barrel 3 flows into the rotary shaft 4, then passes through the rotary shaft 4 and flows out of the barrel 3, thereby permitting the plating liquid to flow uninterruptedly into the barrel 3 through the communicating holes 7 from the outside to the inside thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrel plating apparatus for storing small parts in a barrel, immersing the barrel in a plating solution in a plating bath and rotating the barrel to plate the small parts.

[Prior art]

The plating method includes an electrolytic plating method which is an electrochemical method and an electroless plating method which is a pure chemical method. These methods rotate as an apparatus for plating small parts. A so-called barrel plating apparatus using a basket-shaped barrel is already known. The barrel used in this type of rotary barrel plating apparatus is made of acrylic resin or the like, and has a tubular body formed in a hexagonal tubular shape or an octagonal tubular shape.
It is composed of a disk-shaped end plate that closes the end surface of this cylindrical body. A slit-shaped through hole is formed on the peripheral surface of the cylindrical body so that the plating solution can flow in and out of the cylindrical body when immersed in the plating solution.

When electrolytically plating a small amount of work with such a barrel, a conductor, which is almost the same shape as the work, a so-called dummy, is placed in the barrel to help contact between the work and the cathode rod inserted into the barrel. Put in. Then, the barrel is immersed in a plating bath filled with a plating solution and the barrel is rotated.

When the barrel is rotated, the work and the dummy inside the barrel are lifted from the bottom of the barrel along the inner wall of the barrel by the rotation of the barrel and fall at a certain height, which is then dropped. Repeatedly disturbed. At this time, the work comes into contact with the cathode in the barrel directly or through the dummy, and plating is performed. Such a barrel plating apparatus is often used for tin plating or solder plating the terminal electrodes provided at both ends of a chip component such as a multilayer capacitor.

[Problems to be Solved by the Invention]

In recent years, the miniaturization of the chip components as described above has been advanced, and accordingly, the dummy used has also been miniaturized. For this reason, when these are stored in the barrel and stirred, the chip parts or the dummy, which are the work, are fitted into the slit-shaped through holes provided in the peripheral wall of the barrel to allow the plating solution to pass therethrough, and the through holes become visible. It gets stuck. If this happens, the circulation of the plating solution will deteriorate and the parts will be damaged,
There was a problem of low productivity.

An object of the present invention is to solve the above problems, and it is difficult for a work or a dummy to fit into a slit-shaped through hole provided in the peripheral wall of the barrel for passing the plating liquid, and the plating liquid inside and outside the barrel. It is an object of the present invention to provide a barrel plating apparatus that is well distributed to the market and therefore can achieve high productivity.

[0007]

That is, the gist of the present invention for solving the above problems is to provide a plating bath 1 filled with a plating solution and a through hole 7 in a peripheral wall thereof.
In a barrel plating apparatus comprising a barrel 3 rotatably immersed in a barrel 3 and a rotating mechanism for driving the barrel 3 to rotate in a plating bath 1, a tubular shape in which a rotation shaft 4 of the barrel 3 communicates with the inside and outside of the barrel 3. As a body, by rotating the barrel 3,
The barrel plating apparatus is characterized in that a feed means for causing the plating liquid in the barrel 3 to pass through the rotary shaft 4 and flow out to the outside of the barrel 3 is provided inside the rotary shaft 4. In this case, the through hole 7 on the peripheral wall of the barrel 3 is preferably a spiral slit.

[0008]

In the barrel plating apparatus according to the present invention, the barrel 3
Since the rotary shaft 4 of the rotary shaft 4 is formed into a cylindrical body that communicates with the barrel 3 and the flow sending means is provided therein, the spiral groove 6 inside the rotary shaft 4 is formed.
Thus, when the barrel 3 is rotated, the plating liquid in the barrel 3 flows into the rotary shaft 4 and further flows out of the barrel 3 through the rotary shaft 4. Therefore, the plating solution constantly flows from the outside to the inside through the through hole 7 in the barrel 3, and the flow of the plating solution prevents clogging of the through hole 7 with parts and dummy. Therefore, the rotary shaft 4
In addition to the forced outflow of the plating solution due to, the circulation of the plating solution into and out of the barrel becomes good. When the through hole 7 in the peripheral wall of the barrel 3 is formed as a spiral slit, the stirring action of the plating liquid in the plating bath 1 by the barrel 3 is enhanced.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, a barrel 3 is rotatably immersed in a plating bath 1 filled with a plating solution. The barrel 3 has a cylindrical shape, a hexagonal tube shape, or the like, and a slit-shaped through hole 7 is formed in a peripheral wall 7 thereof. The slit-shaped through hole 7 is thinner than the width and diameter of a component (not shown) to be plated, and as shown in FIG.
It is provided obliquely on the peripheral wall of the barrel 3, that is, in a spiral shape. Here, the through hole 7 is also provided on the back side in FIG. 2, but the other through hole 7 may be tilted in the opposite direction to the through hole 7 seen on the front side in FIG.

As shown in FIG. 1, a pair of bearings 2 and 2 are erected in a plating bath 1 so as to face each other.
Rotating shafts 4, 4 projecting from the center of the end face of the barrel 3 in the direction of the central axis of the barrel 3 are rotatably supported on the shaft 2. The rotating shafts 4 and 4 have a cylindrical shape, and the inside of the rotating shafts 4 and 4 communicates with the barrel 3 through through holes 10 and 10 provided at the center of the end surface of the barrel 3. Further, spiral grooves 6 are formed on the inner circumferences of the rotary shafts 4 and 4, and the leads of the grooves 6 are opposite to each other on the rotary shafts 4 and 4 on both ends of the barrel 3. There is.

Of the rotary shafts 4 and 4, one of the rotary shafts 4, that is, the rotary shaft 4 on the right side in FIG. 1 is connected to the transmission shaft 11 via a spoke 5 provided on the inner peripheral side of the tip thereof. There is. The transmission shaft 11 is drawn out of the plating bath 1 through a seal bearing 12 and is connected to a motor 8 as a rotation source via a transmission mechanism 9. This motor 8
Is due to the lead of the spiral groove 6 of the rotary shafts 4 and 4,
The plating liquid around the groove 6 rotates the barrel 3 in a direction in which the plating liquid is led out from the inside of the barrel 3 to the tip side thereof.

In this barrel plating apparatus, the barrel 3
A work, which is a part to be plated, and a dummy made of a conductor having substantially the same shape as that of the work are housed therein, and a cathode rod (not shown) is further inserted into the barrel. The work and the dummy are stored in an amount that is filled below the rotary shafts 4 and 4. Then, the barrel is immersed in the plating bath 1 filled with the plating solution, the rotation shaft 4 thereof is supported by the bearings 2 and 2, and the barrel 3 is rotated in the above-mentioned direction by the motor 8.

When the barrel 3 is rotated, the work and the dummy in the barrel 3 are lifted from the bottom of the barrel 3 along the inner wall of the barrel by the rotation of the barrel 3 and fall at a certain height. While repeating this, it is disturbed. At this time, the work comes into contact with the cathode in the barrel 3 directly or through the dummy, and plating is performed.

When the barrel 3 rotates in this manner, the plating solution in the barrel 3 is guided into the rotary shaft 4 along the spiral groove 6 of the rotary shaft 4, and further passes through the rotary shaft 4 to pass through the barrel 3. Spill out of. Therefore, the plating solution constantly flows into the barrel 3 from the outside through the through holes 7 in the peripheral wall, and the flow of the plating solution prevents clogging of the through holes 7 with parts and dummy. Further, since the through hole 7 in the peripheral wall of the barrel 3 is a spiral slit, the plating liquid in the plating bath 1 is stirred by the barrel 3.

Next, the embodiment shown in FIG. 3 will be described. Here, an auger shaft 16 is installed in the rotary shaft 4 over the central axis thereof. Rotating shaft 4 with barrel 3
As a result of the rotation, the auger shaft 16 causes the plating solution in the barrel 1 to enter the rotating shaft 4 and be discharged from there. On the other hand, in the embodiment shown in FIG. 4, the screw 17 is provided in the rotary shaft 4. The rotation of the rotating shaft 4 together with the barrel 3 causes the screw 17 to rotate, whereby the plating solution in the barrel 1 is rotated by the rotating shaft 4
It enters and is discharged from here.

[0016]

As described above, according to the present invention, since the plating solution constantly flows from the outside of the barrel 3 to the inside thereof through the through hole 7 of the barrel 3, the plating solution is provided on the peripheral wall of the barrel 3. It is difficult for a work or a dummy to fit into the slit-shaped through hole 7 provided. In addition, the distribution of the plating solution into and out of the barrel 3 is good, and therefore high productivity can be obtained. Further, in the case where the through hole 7 in the peripheral wall of the barrel 3 is a spiral slit, the stirring action of the plating solution in the plating bath 1 by the barrel 3 is enhanced, which promotes the circulation of the plating solution and the passage of the barrel 3. Workpiece clogging in the holes 7 can be prevented more effectively.

[Brief description of drawings]

FIG. 1 is a side view in which a part of a barrel plating apparatus according to an embodiment of the present invention is longitudinally cut.

FIG. 2 is a side view of the barrel used in the barrel plating apparatus according to the embodiment, viewed from a direction different from that of FIG. 1 by 90 °.

FIG. 3 is a vertical sectional side view of a main part of a barrel plating apparatus according to another embodiment of the present invention.

FIG. 4 is a vertical sectional side view of a main part of a barrel plating apparatus according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plating bath 3 Barrel 4 Rotating shaft of barrel 6 Spiral groove of rotating shaft 7 Through hole of barrel 8 Motor 16 Auger shaft 17 Screw

Claims (2)

[Reference number] 0041061-01 [Claims] 1. A plating bath (1) filled with a plating solution.
And a through hole (7) is formed in the peripheral wall, and the plating bath (1) is formed.
A barrel plating apparatus comprising a barrel (3) rotatably immersed in a barrel and a rotating mechanism for rotating the barrel (3) in a plating bath (1).
The rotating shaft (4) of is made into a cylindrical body which communicates with the inside and outside of the barrel (3), and the rotation of the barrel (3) causes the plating liquid in the barrel (3) to pass with the rotating shaft (4) and A barrel plating apparatus, characterized in that a flow sending means for flowing out to the outside is provided inside the rotating shaft (4). 2. The barrel plating apparatus according to claim 1, wherein the through hole (7) in the peripheral wall of the barrel (3) is a spiral slit.