JPH0765237B2 - Draining method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a process drainage method using a liquid.

[Conventional technology]

The conventional process using a liquid, for example, the liquid removing method in the plating process, is as shown in FIGS. 2 and 3, by vibrating the work catching jig 1 by hand or mechanical operation 13, or by the process shown in FIG. The method in which the solution is drained by allowing the solution to stand still for a certain period of time on the plating tank 2 and draining the solution is common.

[Problems to be solved by the invention]

In the liquid draining method by rocking, there is a problem that the work is dropped from a jig having a weak work hooking force. Also, in the method of draining by leaving it stationary for a certain period of time, spots due to drying of the liquid remain over time, and if the time is shortened, sufficient draining cannot be performed and the plating liquid is often brought out of the plating tank. There was a problem.

[Means for solving problems]

The present invention is characterized in that in the process of performing liquid treatment, the work is exposed from the liquid surface at a speed affected by the surface tension.

It is also characterized in that the work in the tank is raised above the liquid level at 20 mm / sec or less.

[Action]

By the above method, the liquid adhering to the workpiece and the workpiece catching jig tries to remain in the attracting bath with the liquid in the bath. The liquid of the work is peeled off due to this phenomenon, and the residual liquid amount of the work and the work hooking jig is reduced.

〔Example〕

An embodiment in which the present invention is applied to a plating process will be described below with reference to the drawings.

In FIG. 1, a plating tank 2 in which a work hooking jig 1 is placed
To provide. An inverted L-shaped frame 4 is installed outside the plating tank, and a motor mounting plate 7 is fixed to the top end of the frame. Further, a drive motor 6 having a pinion rack 5 for moving the workpiece hooking jig 1 up and down and having an adjustable rotation speed
Is fixed to the motor mounting plate. By attaching a hook 8 for suspending the workpiece hooking jig 1 to one end of the pinion rack 5, the workpiece can be taken in and out of the plating liquid 3.

The pinion rack is lowered to the position of the handle portion 12 of the workpiece hooking jig in the plating tank, the hook is hooked on the handle portion, and then the work motor is started to be pulled up. At this time, the work rising speed should be 20 mm / sec or less.
As a result of the surface tension, the residual liquid amount of the work becomes small.
This lifting is carried out until the lowermost end of the workpiece catching jig is separated from the liquid surface in the plating tank, and the driving motor is stopped after the separation is completed. As described above, the work 11 and the work catching jig were drained, and the carry-out of the liquid to the outside of the plating tank could be reduced.

Fig. 5 shows the temperature of the cyan gold plating solution and the plating bath at 30
FIG. 9 is a relationship diagram between the amount of residual liquid of a work and the pulling rate when a liquid draining device is used under the condition of ± 5 ° C.

The residual liquid amount of the work of the conventional method, which is a stationary draining method on the plating tank for a certain period of time, is the same as the residual liquid amount when the work is pulled up at 20 mm / sec. Can not be obtained. Further, since the pulling rate is also required to be 1 mm / sec or more for practical use, the desirable pulling rate is 1 to 5 mm / sec depending on the allowable limit of the residual liquid amount.

〔The invention's effect〕

Since the liquid is drained by utilizing the surface tension of the liquid as described above, there is no problem that the work falls due to vibration. Further, the residual liquid amount of the work can be reduced as compared with the liquid draining method in which the work is stopped for a certain time. In the embodiments, the explanation has been made on the plating layer, but the present invention is not limited to the plating liquid, and can be applied to pulling up from a normal cleaning device. Further, instead of pulling up the work, the work may be relatively raised from the liquid surface by draining the liquid from the plating bath.

[Brief description of drawings]

FIG. 1 is a side view of the liquid draining device according to the present invention. Second
FIGS. 3, 3 and 4 are views showing a conventional liquid draining method. Fifth
The figure shows the relationship between the residual liquid volume of the work and the pulling speed.

Claims (2)

[Claims] 1. A liquid draining method, wherein in a liquid draining step of a plating operation, a work is exposed from the liquid surface at a speed at which the liquid surface of the liquid is affected by surface tension. 2. The liquid draining method according to claim 1, wherein in the liquid draining step of the plating operation, the speed of the work is raised above the liquid surface at 20 mm / sec or less.