JPH075897Y2 - Tooth surface coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coating device, and more particularly to a device for applying a coating on the surface of an automobile part.

(Prior Art) As is well known, in a rubbing portion between metals, the load at the time of friction engagement may differ depending on the finish state of the surface, which may cause rubbing noise or the like. There is a risk of generating noise.

Therefore, for example, there is a case in which a spline that performs frictional engagement among automobile parts is coated on its surface with a polyamide resin having a low coefficient of friction, so-called nylon, so as to prevent metal-metal contact. is there.

In performing such nylon coating, as shown in FIG. 6, it is possible to flow in a container B in which a preheated spline shaft A can be rotatably arranged, in other words, a fine floating substance, Specifically, nylon particles having a particle size of several tens of μm are stored, and a high-speed air from a pump E is sent by merging a supply pipe D whose one end is inserted into the storage C so that the high-speed air from the storage C is discharged. A structure is used in which an injection nozzle F that ejects nylon particles and ejects them onto the spline teeth a of the rotating spline shaft A is used.

The storage part C in the container B described above has a shielding plate C1 on the upper part.
However, a mesh member C2 such as a woven fabric is located in the lower part, and the air is supplied from the blower pipe H inserted in the side wall of the container B corresponding to the lower part of the mesh member C2. It is like this.

That is, the air from the blower pipe H is the mesh member C2.
Permeate into the storage section C and crush the mass of nylon particles inside into a single fine particle, in other words, stir,
It facilitates inhalation through the supply pipe D and facilitates uniformization of the layer thickness of the coating formed on the spline teeth a.

(Problems to be solved by the invention) By the way, in the above-mentioned device, the nylon particles accumulated on the storage portion C are scattered and stirred to unify the nylon particles. Due to the moisture contained in the air blown from the pipe H and the moisture in the container B that affects the air while being stored in the storage unit C, the nylon particles having hygroscopicity may take on moisture.

As described above, the moisture-laden nylon particles may cause water droplets to adhere depending on the ambient temperature, which causes a change in the mass of the nylon particles or the surface energy between the particles, and the blower pipe H In some cases, scattered stirring with air may not be performed satisfactorily.

For this reason, in order to prevent the occurrence of such a problem, the nylon particles in the storage section C are taken out and dried, but a management work for this is required, which is troublesome in the nylon coating step. However, a new problem arises in that equipment for drying is required.

Therefore, an object of the present invention is to provide a coating apparatus which can eliminate the need for management of a material used for coating when moisture is absorbed, in view of the problems in the conventional coating apparatus.

(Means for Solving the Problem) In order to achieve this object, the present invention is an apparatus for coating a tooth surface of a gear member for frictional engagement with a resin having a low friction coefficient, which is heated to a predetermined temperature in a previous step. A coating chamber in which the gear member is held in a predetermined position, a storage chamber which is arranged under the coating chamber and is separated from the coating chamber by a shielding plate to store fine particles having high hygroscopicity, and a storage chamber in the lower portion of the storage chamber. A container partitioned into three chambers, an air chamber that is separated from the storage chamber by a mesh member and into which pressurized air is introduced; an introduction pipe that is connected to the air chamber and that introduces pressurized air into the air chamber; A heating mechanism, which is located near the air chamber in the middle of the introduction pipe, heats the pressurized air to dehumidify it, and sucks fine particles dehumidified in the storage chamber connected to the storage chamber. It is configured by an injection nozzle having a suction part for raising and a nozzle for spraying the fine particles sucked up from the suction part to the tooth surface of the gear member held in the coating chamber.

(Operation) According to the present invention, the air sent to the mesh member is dehumidified, and if water droplets are attached to the nylon particles in the storage unit, they are dehumidified by dry air.

Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 6.

FIG. 1 is a sectional view corresponding to FIG. 6 showing a coating apparatus according to an embodiment of the present invention, and the same components as those shown in FIG. 6 are designated by the same reference numerals.

The feature of this embodiment is that a mechanism for generating dry air is provided in the middle of a blower pipe that sends pressurized air to the mesh member.

That is, the heating mechanism, which is the dry air generation mechanism described above.
10 is provided in the vicinity of the open end of the blower pipe H, for example, a honeycomb heater located in the pipe.
It consists of 10.

Although not shown in detail, the honeycomb heater 10 is configured by patterning an electric resistance material in a block forming a honeycomb structure and connecting an AC power source 11 to electrodes formed at each end of this pattern. .

The above-mentioned honeycomb heater 10 is heated to a temperature at which moisture contained in the outside air introduced toward the mesh member C2 can be completely removed, in other words, it is heated at a temperature corresponding to the saturation temperature. .

By the way, the spline shaft A provided for the above-mentioned coating apparatus is conveyed to the coating apparatus through the steps shown in FIG. 3, and as an apparatus used for the conveyance, as shown in FIG. Cylinder for lifting work 13
And a chuck 14 mounted on the tip of the actuator of the ascending / descending cylinder 13 to move to the next process by ascending ⇒ lateral feed ⇒ descending by both cylinders 13 and 13 ′. To be done.

That is, the chuck 14 described above, as shown in FIG.
A base material 14a having an orifice inside, a hanging pipe 14b connected to the small diameter portion of the orifice of the base material 14a, and a flange 14c integrated at the open end of the hanging pipe 14b and fixed to the lower surface of the flange 14c. It is an air chuck composed of a packing 14d.

On the other hand, the spline shaft A attracted by the chuck 14
As shown in FIG. 5, a spherical recess a1 is formed in the base portion of the base so that it can be easily held in vacuum.

Since the present embodiment has the above structure, the mesh member
The air sent to C2 is made into dehumidified dry air, comes into contact with the nylon particles, and is used to scatter and stir the nylon particles.

On the other hand, the dry air that comes into contact with the nylon particles dehumidifies the nylon particles while sufficiently contacting the nylon particles in the storage portion C, and prevents the nylon particles from increasing in mass.

The heating mechanism 10 described above may be an ordinary heater that surrounds the outer circumference of the blower pipe H, instead of the honeycomb heater.

Further, the opening end of the blower pipe H on the container side, instead of being simply cut off, has a tapered shape in which its central portion is tapered in the traveling direction of air, as shown in the second illustration. It is also possible to dispose the discharge member 12 and set a difference in velocity to the air so that the air is spread over the entire area of the mesh member C2.

(Effect of the Invention) As described above, according to the present invention, when dehumidifying fine particles for coating having a hygroscopic substance before suction spraying, the air for dehumidifying the fine particles is heated by the heating mechanism to completely dehumidify the particles. It can be contacted with fine particles in the state of being prevented, while preventing an increase in mass in the fine particles, when the completely dehumidified air and the fine particles are in contact, the floating property of the fine particles is not deteriorated and is good. Dehumidification can be performed, which eliminates the need to control the moisture absorption of fine particles, and can reduce the management equipment. Also, immediately after dehumidifying fine particles, the tooth surface of the gear member can be coated with the injection nozzle. As a result, coating with a uniform film thickness can be performed, and the number of man-hours for polishing the tooth surface after the coating process can be reduced.

[Brief description of drawings]

1 is a sectional view showing a coating apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing a partial modification of the coating apparatus shown in FIG. 1, and FIG. 3 is a coating apparatus according to an embodiment of the present invention. A layout diagram of an apparatus used in the processing step relating to coating, FIG. 4 is a schematic view showing a transfer structure of a spline shaft used in the processing step shown in FIG. 3, and FIG. 5 is a transfer method shown in FIG. FIG. 6 is a sectional view showing a chuck used for the structure, and FIG. 6 is a sectional view corresponding to FIG. 1 showing a conventional coating apparatus. 10: Heating mechanism, A: Spline shaft, B: Container, C
…… Storage unit, C1 …… Shield plate, C2 …… Mesh member, D…
... Suction supply pipe, F ... Injection nozzle, H ... Blower pipe, I ... Coating chamber, J ... Air chamber.

Claims (1)

[Scope of utility model registration request] 1. An apparatus for coating a resin having a low friction coefficient on a tooth surface of a gear member (a) for frictional engagement, wherein the gear member (a) heated to a predetermined temperature in a previous step is placed at a predetermined position. A coating chamber (I) to be held, and a storage chamber (hereinafter referred to as a storage chamber (I)), which is arranged below the coating chamber (I) and is separated from the coating chamber (I) by a shielding plate (C1), to store fine particles having high hygroscopicity ( C) and the above storage room (C)
(B) divided into three chambers, which are arranged below the storage chamber (C) by a mesh member (C2) and into which pressurized air is introduced (B), and the air chamber And an introduction pipe (H) for introducing the pressurized air into the air chamber (J), and an intermediate portion of the introduction pipe (H) disposed near the air chamber (J). A heating mechanism (10) for heating and dehumidifying pressurized air, and the storage chamber (C) in the coating chamber (I).
Connected to the suction chamber (D) for sucking the fine particles dehumidified in the storage chamber (C), and the fine particles sucked from the suction unit (D) were held in the coating chamber (I). And a spray nozzle (F) having a nozzle for spraying the tooth surface of the gear member (a).