JPH043002Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a plating device that performs plating by moving an object to be plated attached to a plating carrier through a plating liquid while rotating it. Regarding.

[Conventional technology]

When plating a large number of objects to be plated on a mass production scale, a carrier for plating is used, the objects to be plated are attached to the carrier, and the carrier is placed on the rail of the transport mechanism installed above the plating tank. A method is used in which the object to be plated is dipped in a plating solution and moved while plating is carried out. At this time, with a uniform film thickness,
In order to obtain a homogeneous plated film free of defects such as pits and pinholes, the object to be plated is rotated, revolved, or revolved during the plating process. A motor is often mounted on the carrier to provide such rotational drive. However, plating solutions are often heated to temperatures of several tens of degrees Celsius or higher, and during the plating process, more water vapor, mist, and corrosive gases are generated than the plating solution.
Water containing strong electrolytes condenses on the motor mounted on the carrier, causing insulation failure, which often causes the motor to stop rotating.

For example, recently, magnetic disk devices have been widely used as external storage devices for computers, and the metal thin-film magnetic disks used in these magnetic disk devices use an aluminum alloy disk as a substrate with electroless Ni-P plating. are commonly used. This plating is formed as an underlayer to withstand mechanical shock when a magnetic head collides with the disk surface, and also as an underlayer to facilitate mirror finishing of the substrate surface during disk manufacture. For this purpose, the plating film thickness is
The thickness is 10 μm to 20 μm. For this plating, a method is adopted in which the plating is performed using the above-mentioned plating carrier while rotating and revolving the aluminum alloy disk.
Plating is performed by immersing the material in a plating solution heated to 0.degree. C. for a long time of 2 to 4 hours. During that time, the motor installed in the carrier was exposed to a harmful atmosphere, and motor insulation failures were occurring frequently.

In order to prevent the occurrence of such motor insulation failures, measures have been taken to prevent the motor from being exposed to harmful atmospheres by installing a sealed container in the carrier and housing the motor therein.

[Problem that the invention attempts to solve]

As mentioned above, housing the motor in a sealed container keeps out harmful atmospheres and prevents electrolyte-rich water from condensing on the motor, but it also reduces heat conduction from the surrounding environment and from the motor itself. The problem was that the temperature inside the closed container rose due to heat generation, causing the motor to overheat, making continuous operation difficult.

The present invention eliminates the above-mentioned drawbacks, protects the motor mounted on the plating carrier for rotating the plated object from harmful atmosphere in a simple manner, and prevents the motor from overheating. The purpose of the present invention is to provide a plating device that can withstand continuous use for a long period of time.

[Means for solving problems]

In order to achieve the above object, this invention provides a plating device that performs plating while rotating an object to be plated, which is attached to a plating jig attached to a plating carrier, in a plating solution. A motor mounted on a plating carrier for rotating the object to be plated is housed in a semi-airtight container with two small holes provided in the plating carrier, and is powered by compressed air or inert air. The plating apparatus is configured such that gas is introduced through one small hole and discharged from the other small hole so that the inside of the semi-closed container is always maintained at a positive pressure from the outside.

[Effect]

By introducing compressed air or inert gas into a semi-closed container through one small hole and exhausting it through the other small hole so as to maintain a positive pressure inside the container at all times,
Water vapor, mist, corrosive gas, etc. cannot enter the container, and the motor housed in the container is no longer exposed to these harmful substances. Furthermore, the internal motor is cooled by flowing compressed air or inert gas inside the semi-closed container.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an apparatus for electroless Ni--P plating of a magnetic disk substrate according to an embodiment of the present invention.
In Figure 1, 1 is a plating tank, 2 is an electroless Ni
- P plating liquid, 3 a carrier for plating, 4 a motor for rotating the substrate, which is stored in a semi-closed container 5, 6 a support rod for the carrier for hanging it on a transport rail 7, 8 A plating jig, 9 a substrate to be plated, 10 a gear mechanism for transmitting the rotation of the motor to the substrate via the plating jig, 1
1 is an air (compressed air) introduction pipe connected to one of two small holes provided in the semi-sealed container; 12 is an air discharge pipe connected to the other small hole in the semi-sealed container; 13
This is a heater for heating the plating liquid.

The board 9 is rotatably mounted on the support shaft of the plating jig 8 in a groove cut at an appropriate pitch so that adjacent boards do not come into contact with each other, and the gear 10 is driven by the motor 4 during plating. As the plating jig 8 rotates, the plating jig 8 rotates around itself and revolves around itself. The plating jig 8, and therefore the carrier 3 to which the substrate 9 is attached, is used to apply the plating liquid 2 to the substrate 9.
The substrate 9 is suspended from a transport rail 7 by a support rod 6 so as to be immersed in the plating liquid, and is transported by a transport mechanism (not shown), and is plated while moving in the plating solution.

The plating liquid is heated to 85°C to 96°C by the heating heater 13.
heated to. For this reason, during plating work,
A large amount of water vapor, hydrogen gas generated by the plating reaction, mist containing plating solution, and corrosive gas are emitted from the plating tank. In conventional plating equipment, the motor is housed in a completely sealed container to avoid the negative effects of these harmful atmospheres. It was not possible to run continuously for hours.

In this embodiment, the motor 4 is mounted in a semi-sealed container 5 provided with two small holes, one of which has an air introduction pipe 11 and the other small hole with an air discharge pipe 12. connected. During the plating work, room-temperature or cooled air is constantly flowed into the semi-closed container 5 through the air introduction pipe 11 and discharged to the outside through the air discharge pipe 12. At this time, the air flow rate is set to such an extent that the inside of the semi-closed container 5 always has a positive pressure compared to the outside. If plating is performed in such a state, harmful substances such as water vapor will not enter the semi-closed container 5, and the motor 4 inside the container will not be damaged. Furthermore, since air is constantly flowing, the motor 4 is cooled and does not overheat, allowing continuous operation for a long time.

In this example, air (compressed air) is placed inside the semi-sealed container.
Although the flow is not limited to air, an inert gas such as nitrogen may also be used. Furthermore, such an apparatus is effective not only for plating magnetic disk substrates, but also for other types of plating, and is particularly effective when using a high-temperature plating solution.

[Effect of idea]

According to the present invention, a motor for rotationally driving an object to be plated is housed in a semi-closed container installed in a plating carrier, and compressed air or inert gas is introduced into and discharged from the container. It is used as a plating device.

By using such a device, plating can be easily performed by flowing compressed air or inert gas so that the inside of the semi-sealed container is always at a positive pressure from the outside. It protects from harmful atmospheres such as water vapor and prevents the motor from overheating, making it possible to perform plating work continuously for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a plating apparatus according to an embodiment of the present invention. 1...Plating tank, 2...Plating liquid, 3...Carrier, 4...Motor, 5...Semi-sealed container, 6...
Support rod, 7...Rail, 8...Plating jig, 9...
... Board, 10 ... Gear mechanism, 11 ... Air introduction pipe, 12 ... Air discharge pipe, 13 ... Heater.

Claims (1)

[Scope of utility model registration request] In a plating device that performs plating while rotating an object to be plated, which is attached to a plating jig attached to a plating carrier, in a plating solution, the object to be plated is mounted on a plating carrier and rotates. A motor for plating is installed on the plating carrier.
The container is stored in a semi-sealed container with several small holes, and compressed air or inert gas is introduced into the semi-sealed container through one small hole to maintain a positive pressure inside the semi-sealed container from the outside. A plating device characterized in that the plating device is discharged from the plating device.