JPS6393897A - Plating liquid injection type plating device - Google Patents

Abstract

PURPOSE:To prevent bubbling in a plating cell at the start of an operation, by forming an overflow tank which recovers a plating liquid to the outside of a plating cell provided internally with nozzles for injecting the plating liquid to block-shaped works. CONSTITUTION:The plural block-shaped works Q held by jigs 21 connected to a negative electrode are disposed in the plating cell 1 in which the plating liquid is stored. The plating liquid is ejected from the plural plating liquid ejection nozzles 11 to the above-mentioned works Q. Anodes 22 are further disposed to face the works Q and the plating is executed. The overflow tank 5 is provided on the outside of the above-mentioned plating cell 1 to recover the plating liquid overflowing from the cell 1. The recovered plating liquid is injected from the nozzles 11 through pipes 8, 10 by a plating liquid return mechanism having a pump 7. The cell 1 acts as a storage tank for storing the plating liquid while the pump 7 is held stopped. The bubbling in the cell 11 is thus prevented at the time of starting the injection operation and the working efficiency is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a plating processing apparatus for processing a plurality of block-shaped workpieces (8!E block-shaped workpieces) as one workpiece group, and particularly The present invention relates to a plating solution injection type plating processing apparatus that performs electroplating while spraying plating solution onto a workpiece from a plurality of plating solution spray nozzles.

(Prior art) An example of this type of processing device is
No. 8-31478 (Japanese Unexamined Patent Publication No. 157300/1983). In this equipment, multiple plating solution injection nozzles are arranged on both sides of a single plate-shaped workpiece suspended in a plating treatment tank, and plating is performed while spraying the plating solution from these injection nozzles toward the workpiece. It has become.

In addition, in all conventional injection processing equipment, the plating solution is supplied to the nozzle by a pump from another tank (storage tank) provided below the plating processing tank, and the plating solution injected into the plating processing tank is as described above. It is designed to flow down to the storage tank. An example of a structure in which a storage tank is provided separately from the plating treatment tank is disclosed in Japanese Patent Application No. 58-40190 (Japanese Unexamined Patent Publication No. 59-198) filed by the present applicant.
No. 66697).

The applicant attempted to use the plating liquid injection processing equipment, which had conventionally been used only for plating plate-shaped workpieces, for plating block-shaped workpieces (for example, parts such as calipers of vehicle disc brakes). .

(Problems to be Solved by the Invention) However, it has been found that if the conventional apparatus is used as is for processing disc brake parts for vehicles, the following problems occur.

That is, when processing the above-mentioned parts, it is necessary to use a plating solution with high foaming properties in order to shorten processing time and improve processing quality.

However, in the conventional structure, when the work is completed and the apparatus is stopped, the plating solution in the plating tank flows down to the storage tank below, so the plating tank is empty before the work starts. For this purpose, it is necessary to supply the plating solution in the storage tank from the nozzle to the plating processing tank using a pump prior to the work, but when the highly foaming plating solution is jetted from the nozzle into the empty processing tank, the entire processing tank becomes foamy. However, a problem arises in that plating cannot be started until the bubbles disappear.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for spraying a plurality of plating solutions onto a plurality of block-shaped workpieces into a plating treatment tank that stores plating solutions. An injection nozzle is provided, an overflow tank is formed outside the processing tank for collecting the plating solution overflowing from the processing tank, and the overflow tank and the plating solution injection nozzle are connected by a plating solution return mechanism having a pump, The plating treatment tank is characterized by forming a storage tank for storing the plating solution when the pump is stopped.

(Function) According to the above structure, the plating tank also serves as a storage tank, so even when the work is finished and the pump is stopped, the plating solution remains in the processing tank, and the processing tank never becomes empty. do not have. Therefore, even if the plating solution is injected from the nozzle at the start of the next operation, the plating solution will be injected into the plating solution, and the inside of the processing tank will not bubble.

(Example) FIG. 1 is a schematic vertical cross-sectional view of an apparatus according to an example, and FIG. 2 is a schematic cross-sectional view taken along the line ■-■ in FIG. In these figures, a plating tank 1 has a bottom wall 2 and a peripheral wall 3, and is installed on a foundation 4. A plating solution recovery container or recovery groove 5 (overflow tank) is formed on the outside of the upper part of the peripheral wall 3. An inlet of a return pipe 6 is connected to the bottom of the recovery groove 5 .

The pipe 6 is equipped with a pump 7 in the middle, and the outlet is connected to the plating treatment tank 1.
It is connected to a pair of internal vibrators 8.

The vibrator 8 extends horizontally at the bottom of the plating tank 1 at intervals in the left-right direction (left-right direction in FIG. 1). As shown in FIG. 2, riser vibes 10 extend upward from a plurality of locations spaced apart in the front-rear direction (left-right direction in FIG. 2) of each vibe 8.

As shown in FIG. 1, plating solution spray nozzles 11 are provided at a plurality of vertically spaced locations on each vibrator 10 toward a workpiece installation area 12, which will be described later. Each nozzle 11 is configured so that its spray angle can be adjusted in any direction, front, back, left, or right, and specifically, it is configured as shown in FIG. 3, for example.

In Fig. 3, which is an enlarged partial view of the ■-■ cross section of Fig. 2,
The nozzle 11 includes a cylindrical bolt-like member 15, a nut-like member 16, and a nozzle member 17. Bolt-shaped member 1
5 has a male threaded portion at the proximal end fixed to a threaded hole in the pipe wall of the vibrator 10. The nut-shaped member 16 is fixed to a threaded portion at the tip of the bolt-shaped member 15. A spherical surface formed on the outer circumference of the base end of the nozzle member 17 is rotatably fixed to a spherical seat formed on the distal end of the bolt-like member 15 and the inner circumference of the nut-like member 16.

In Fig. 1, the workpiece installation area 12 has a vertical height H, a horizontal width W, and a longitudinal length (Fig. 2).
It is formed between the left and right vibrators 10 groups. In this workpiece installation area 12, a plurality of works Q (vehicle disc break parts in the embodiment) are arranged with gaps 20 in between in the vertical direction (or in the horizontal direction or in both the vertical and horizontal directions). The workpiece Q is held in a frame-shaped jig 21, for example, and is connected to a negative electrode.

Among the large number of nozzles 11 described above, some (plural) nozzles 1
1, the injection direction is set toward the gap 20 between the workpieces, as shown by the broken line M in FIG. Further, the other plurality of nozzles 11 have their jetting directions directed toward the workpiece Q, as shown by the solid line N. Further, the directions of the left and right nozzles 11 facing the gap 20 are shifted from each other so that the plating liquid flows from both sides do not collide with each other.

An anode 22 is arranged at a position opposite to the workpiece installation area 12 with respect to the left and right pipes 10 groups. The anode 22 is placed directly in front of the workpiece installation area 12,
More specifically, the center part of the anode 22 is arranged so as to be lined up in the left-right direction with respect to the center part of the workpiece installation area 12. The anodes 22 on both the left and right sides have vertical heights and longitudinal lengths smaller than the height H and length L of the workpiece installation area 12, and the effective surface area of each anode 22 is considerably smaller than the surface area of the workpiece Q. For example, it is set to about half).

Next, the operation of the device of the embodiment will be explained.

During the plating process, the pump 7 operates, and the plating solution discharged from the pump 7 passes through the vibrator 8.10 and enters the nozzle 11.
erupts from. A part of this spouted plating solution is indicated by the arrow N.
The plating solution flows in this direction and collides with the workpiece Q, stirring the plating solution around the workpiece Q. For other plating solutions, the gap between the workpieces is 2.
0 and the workpiece Q, flows through the gap between the pipes 10 and 10 to the anode 22, and agitates the plating solution around the anode 22. In this way, plating treatment tank 1
Since the entire plating solution is sufficiently stirred, the plating solution with high metal concentration is always supplied to the surface of the workpiece Q. Therefore, a highly accurate plating layer can be formed in a short time.

If the specifications of the workpiece Q are changed, such as the dimensions and shape of the workpiece Q or the number of workpieces Q attached to the jig 21, the third
The direction of the nozzle member 17 shown in the figure is changed to maintain the above jetting state. Further, by temporarily removing the nut-shaped member 16, the nozzle member 17 can be replaced with another nozzle member having a different nozzle shape (hole shape).

In the above processing operation, if the anode is installed in a wider area than the workpiece installation area 12, the current density at the edge of the workpiece Q (for example, the edge 23 in FIG. 1) will be higher than other parts, and therefore the edge The thickness of the plating increases. On the other hand, in the illustrated structure, as described above, since the small anode 22 is used, concentration of current at the edges can be prevented and the plating thickness of the entire workpiece Q can be made uniform.

As the plating solution is sprayed from the nozzle 11 as described above, the plating solution overflows from the upper end of the plating tank 1 and flows into the recovery groove 5. This plating solution flows into the pipe 6 from the recovery groove 5 and is again injected into the plating tank 1 by the pump 7.

In the above operation, the plating solution flowing into the recovery groove 5 is a plating solution with high metal concentration that has been stirred by the jet flow in the direction of arrow M, and the plating solution is not returned to the large storage tank. , is ejected from the nozzle 11 only through a short passage such as the piping 6. Therefore, the metal concentration of the plating solution ejected from the nozzle 11 is high, and in this respect as well, a highly accurate plating layer can be formed in a short time.

When the work is completed and the pump 7 is stopped, the injection from the nozzle 11 is stopped, but the plating solution does not flow out from the plating tank 1, and the plating solution remains in the plating tank 1. becomes. Therefore, when the pump 7 is started at the start of the next work, the plating solution is not injected into the air, but is injected from the nozzle 11 into the plating solution. Therefore, even though the plating solution has a high foaming property, the inside of the plating treatment tank 1 does not foam at the start of injection.

Although not shown, in the plating system,
A large number of plating tanks 1 and other processing tanks are lined up in the front and back or left and right directions, and the workpieces Q, mounted on a jig 21, are immersed in these processing tanks one after another by a transfer robot. .

(Effects of the Invention) As explained above, in the present invention, unlike the conventional jet treatment apparatus, the plating solution can be stored in the plating treatment tank 1 even when the apparatus is stopped.
It is possible to prevent the inside of the plating treatment tank 1 from bubbling due to the plating solution jet from the plating solution.

[Brief explanation of the drawing]

Claims (1)

[Claims] A plurality of plating solution injection nozzles that spray plating solution onto a plurality of block-shaped workpieces are provided inside a plating processing tank that stores plating solution, and the plating solution overflowing from the processing tank is collected outside the processing tank. The overflow tank is connected to the plating solution injection nozzle by a plating solution return mechanism having a pump, and the plating processing tank forms a storage tank for storing the plating solution when the pump is stopped. Plating liquid injection type plating processing equipment.