JP3188554B2 - Electroless plating tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroless plating tank for applying electroless nickel plating or the like to a circular hard disk having a circular hole at the center.

[0002]

2. Description of the Related Art Conventionally, a drive motor is mounted on an upper end of a lifting plate supporting one end shaft of a mandrel, and a gear fixed to the motor shaft is meshed with a gear on the mandrel via an intermediate gear. Is immersed in a plating solution to perform electroless nickel plating while rotating a mandrel by a drive gear. However, in this case, fine powder generated from the meshing portion of the gears enters the plating solution and adheres to the hard disk suspended on the mandrel, so that the performance of the hard disk is significantly reduced.

[0003]

An object of the present invention is to prevent the generation of fine powder (dust) in a treatment tank filled with a plating solution.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a mandrel having a plurality of annular grooves, which is supported horizontally and rotatably in a treatment tank for electroless plating, has a water wheel at an intermediate length thereof, and suspends a circular disk having a circular hole. An electroless plating tank having a processing liquid supply nozzle for injecting the processing liquid into the water wheel at the bottom of the processing tank, and a discharge port for the processing liquid beyond a predetermined level weir in the processing tank.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A circular hard disk 1 shown in FIG. 1 has a concentric circular hole 2 and is, for example, an aluminum plate having an outer diameter of 45 mm (minimum 34 mm). The hard disk 1 is in a vertical posture, and the center hole 2 is fitted into a number of annular grooves 4 having a semicircular cross section provided on the outer periphery of a horizontal mandrel 3 made of Teflon (registered trademark). Also rotates. During the electroless plating operation, the hard disk 1
Is immersed in the plating solution 5 on the liquid level L.

In FIG. 2, a treatment tank 8 for electroless plating is used.
At the left and right ends and at the middle of the bottom plate 9 (for example, made of PVC or stainless steel, abbreviated as PVC), the mandrel 3 is provided.
A pair of supports 1 each having an upper opening slit-shaped bearing 10 for supporting both left and right end portions and an intermediate shaft portion 3a, 3b.
1, 12 are provided. Although the processing tank 8 in FIG. 2 has a configuration in which three mandrels 3 can be set as shown in FIG. 3, it is preferable that ten or more mandrels can be set in mass production. The support 12 can be omitted. The weir 13 at the rear end of the processing tank 8 has a height that regulates the level L of the plating solution 5, and the outlet 15 at the bottom of the liquid leakage receiving chamber 14 (FIG. 3, FIG.
Through the storage tank 17.

In FIG. 2, a radial blade 2 is provided between adjacent shaft portions 3b, 3b at an intermediate portion of the mandrel 3 in the left-right direction.
A water wheel 21 (e.g., made of PVC) having 0 is fixed, and a disc-shaped baffle plate 22 (e.g., made of PVC) having a diameter larger than that of the water wheel 21 is provided by a set bolt 23 near the shaft portion 3b near the side opposite to the water wheel 21. It is fixed. The baffle plate 22 prevents the disturbance of the plating solution 5 by the water wheel 21 from adversely affecting the nearby hard disk 1. When the water wheel 21 has a baffle plate integrally at the left and right ends, the baffle plate 22 shown may be omitted.

A processing liquid (in this case, an electroless plating liquid) supply nozzle 25 is fixed to the bottom plate 9 below the water wheel 21 by a set bolt 26. The nozzle 25 is connected to a discharge port of a pump 28 through a pipe 27, and once stands upright from the bottom plate 9 and then from its upper end to a tip 25a.
(FIG. 3) protrudes rearward, and the rear end opening surface 25b is curved in an arc shape so as to follow the tip trajectory of the blade 20 of the water wheel 21 when viewed from the side (FIG. 3), and the lower end portion of the rear end opening surface 25b. Is at the same height as the lower end of the lowermost blade 20. Reference numerals 29 at both left and right end portions of the mandrel 3 are grip portions for hanging hooks (not shown) for lifting.

The plating solution 5 in the storage tank 17 is pressurized by a pump 28, and the pressurized plating solution gushes vigorously rearward from a nozzle 25 and collides with a blade 20, so that the water wheel 21 is moved in the direction of arrow A in FIG. It is driven at a predetermined rotation speed. The mandrel 3 rotates at a constant speed together with the water wheel 21, and the hard disk 1 suspended on the mandrel 3 also rotates, and electroless nickel plating is performed on the hard disk 1. After a lapse of a predetermined time, the pump 28 is stopped, the mandrel 3 is pulled up, and the mandrel 3 is supplied to the processing tank in the next step.

[0010]

According to the present invention, since the water wheel 21 is driven by the jet of the processing liquid from the nozzle 25, there is no possibility that dust due to abrasion will be mixed into the plating solution 5, and the high quality hard disk 1 will be obtained. Can be. Since the structure is simple, it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view taken along line II of FIG. 2;

FIG. 2 is a vertical sectional front view.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a plan view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard disk 2 Circular hole 3 Mandrel 4 Annular groove 13 Weir 15 Outlet 21 Waterwheel 25 Treatment liquid supply nozzle

Claims (1)

(57) [Claims] 1. A plurality of mandrels having a plurality of annular grooves for supporting a circular disk having a water wheel at an intermediate length and having a circular hole, rotatably supported in a processing tank for electroless plating in a horizontal and rotatable manner, and a bottom of the processing tank. And an electroless plating tank having a processing liquid supply nozzle for injecting the processing liquid into the water wheel and an outlet for the processing liquid beyond a predetermined level weir in the processing tank.