JPH04197464A - Centrifugal coating device - Google Patents

Abstract

PURPOSE:To apply a coating fluid over the entire application surface without variations and quantitatively by providing a rotary drive device, a discharge container which is driven to rotate by the rotary drive device, and constituting the discharge container with receiving/supplying part and a discharge aperture. CONSTITUTION:An electric motor 10 is started, and a valve on a liquid valve device 42 is opened for a specified time. Subsequently, an almost constant amount of an aerophobic adhesive 60 is supplied to the interior 26 of a discharge container 16 in rotate from an aerophobic adhesive supply pipe 30 under an air pressure applied to an aeropholic adhesive 60 through an air pressure pipe 41. The supplied aerophobic adhesive 60 is discharged in the orientation of each discharge orifice 24 over the entire periphery smoothly and at an almost constant velocity by rotation of the discharge container 16. Further, the adhesive is applied to the entire periphery of the inner peripheral surface of a contracted diameter of a rotor hub 56 without variation. After the end of supply of the aerophobic adhesive 60, the electric motor 10 continues to be rotated for a specified time and thereby all of the quantitatively supplied aerophobic adhesive 60 is discharged completely so that the inner periphery surface of the contracted diameter 58 can be coated quantitatively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a centrifugal coating device mainly used for coating a coating fluid over the entire circumference of a circular inner peripheral surface.

[Prior Art] Conventionally, when applying a coating fluid over the entire circumference of the circular inner circumferential surface of an article, it has been carried out, for example, as shown in FIG. 3.

That is, when applying adhesive to the reduced diameter inner circumferential surface 102 of the rotor hub 100 of the spindle motor in order to bond the outer ring outer circumferential surface of the ball bearing to the reduced diameter inner circumferential surface 102 of the rotor hub 100 of the spindle motor, the reduced diameter inner circumferential surface which is the application surface The tip 1 of the nozzle 104 is attached to 102.
05 and extrude the adhesive 106 from the tip 105 by air pressure while rotating the rotor hub 100 placed on the rotary support 108, making one rotation and applying the adhesive 106 all over the circumference. The adhesive application was completed by cutting off the pressure for extruding the adhesive 106 using a valve device.

[Problems to be Solved by the Invention] However, even if the extrusion pressure is cut off after applying the adhesive over the entire circumference, it is difficult to prevent some liquid from dripping from the tip 105 of the nozzle 104. When applying adhesive to the tip 105, the adhesive dripping onto the tip 105 adheres to the reduced diameter inner circumferential surface 102, which is the application surface, and this may cause uneven application, dripping from the application surface, or adhesive leakage. Inconveniences such as protrusion were likely to occur. In addition, the tip 1 of the nozzle 104
05 is applied while contacting the reduced diameter inner circumferential surface 102, which is the application surface, the adhesive tends to adhere to the peripheral edge of the tip 105, which tends to cause uneven application and destabilization of the amount of application. .

The present invention has been made in view of the above-mentioned problems existing in the prior art, and its purpose is to prevent dripping of the coating fluid and adhesion of the coating fluid at the external opening of the discharge hole. The application fluid can be applied quantitatively over the entire circumference of the application surface located on the outer periphery of the external opening of the discharge hole. An object of the present invention is to provide a centrifugal coating device that can prevent the coating fluid from spilling out or dripping.

[Means for Solving the Problem] In order to achieve the above object, the centrifugal coating device of the present invention has the following features:
The discharge container includes a rotational drive means, a discharge container rotationally driven by the rotation drive means, and a supply means for supplying a fixed amount of the coating fluid, and the discharge container serves as a receiving section to which the coating fluid is supplied by the supply means. and a discharge hole that penetrates from the receiving part to the outside of the discharge container in a direction having a radially outward component centered on the rotation axis, and when the discharge container is rotationally driven, the discharge hole is supplied to the receiving part. The applied fluid is discharged through the discharge hole.

[Operation] When the application fluid is supplied in a fixed quantity to the receiving part of the discharge container by the supply means and the discharge container is rotationally driven by the rotational driving means, the discharge hole has a radially outward component from the receiving part about the rotation axis. Since it penetrates the outside of the discharge container in the same direction, the supplied coating fluid is discharged outward from the discharge container through the discharge hole due to centrifugal force, and is applied to the coating surface located on the outer periphery of the external opening of the discharge hole. . Since the coating fluid is discharged evenly over the entire circumference, the coating fluid can be uniformly applied over the entire circumference of the coating surface on the outer peripheral side of the external opening of the discharge hole.

In addition, almost all of the coating fluid facing the opening on the receiving side of the discharge hole can be discharged from the discharge hole by centrifugal force.
It is possible to quantitatively control the total amount of the coating fluid discharged and applied to the coating surface by the amount supplied to the receiving section, and it is possible to minimize the dripping of the coating fluid at the external opening of the discharge hole after coating. It can be eliminated. Therefore, quantitative application prevents under- or over-applying the amount, and the dripped application fluid is applied to the next application surface, causing the application amount to be too large in some areas (which may result in uneven application or This prevents the total amount from becoming too large and causing protrusion or dripping from the coated surface.

However, since the coating fluid is applied to the coating surface without contact,
It is possible to prevent the coating fluid from adhering to the external opening of the discharge hole in the discharge container, which also prevents uneven coating and helps stabilize the amount of coating.

Example 1 An example of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a partially exploded schematic front view showing an example of a usage state of the centrifugal coating device of the present invention, and FIG. 2 is an enlarged exploded cross-sectional view of the main part of FIG. 1.

IO is an electric motor (rotation drive means), and is fixed to the tip of the support beam 12. 14 is a transmission shaft with a circular cross section fixed to the rotation shaft of the electric motor 10. 16 is a cup-shaped discharge container. A transmission shaft 14 is fixed within the discharge container 16 so as to have the same center line, and the discharge container 16 is rotationally driven by the rotation of the electric motor 10 .

The peripheral edge of the bottom surface 20 of the discharge container 16 is chamfered at 45 degrees, and discharge holes 24 are bored inward and upward at about 45 degrees at every 45 degree center angle on the chamfered surface 22.

The inside 26 (receiving part) of the discharge container 16 has an upper opening 28.
The tip of the anaerobic adhesive supplying vibrator 30 is inserted through the anaerobic adhesive supplying vibrator 30 . The inner peripheral surface 34 of the discharge container 16 is a discharge container I6.
The diameter is reduced upward to prevent the anaerobic adhesive supplied inside from rising up and overflowing due to rotation. In addition, in order to prevent the anaerobic adhesive from curing due to metal ions, the material of the discharge container 16 is Duracon (trade name, manufactured by DuPont: polyacetal resin), and the portion of the transmission shaft 14 located inside the discharge container 16 is The outer surface is coated with fluororesin.

Of course, the direction of the discharge holes is not limited to that of this embodiment. For example, they may be provided horizontally in the radial direction.

In short, it is sufficient that the applied fluid in the discharge container can be discharged by the centrifugal force caused by the rotation of the discharge container, and the direction of the discharge hole is not limited to the direction of the rotation axis in addition to the radially outward component centered on the rotating thin wire. It may also have a directional or circumferential component. Further, although the discharge container in this embodiment is open at the top, it does not necessarily have to be opened in this way.

In order to always ensure smooth discharge of the coating fluid from the discharge hole, it is necessary to communicate the receiving section with the outside of the dispensing container, and to ensure that the opening on the receiving section side of the discharge hole is connected to the inside of the coating fluid supplied to the receiving section. It is desirable to have some form of air passage that can be avoided from being blocked by the coating fluid even when the coating fluid is submerged.

36 is a fence disk coaxially fixed below the discharge container 16. This fence disk 36 is intended to stop the anaerobic adhesive from dripping from the discharge container 16 in the unlikely event that it occurs. Although the shape is not limited to a disk shape, the outer diameter needs to be larger than the eccentric distance of the discharge hole 24.

38 is a stand installed on the support beam 12, 40 is an adhesive supply syringe supported by the stand 38, 4
1 is a pneumatic vibrator connected to the adhesive supply syringe 40. The anaerobic adhesive supplying vibrator 30 is disposed between the adhesive supplying syringe 40 and the interior 26 of the discharge container 16, with a liquid valve device 42 fixed to the support beam 12 interposed therebetween. There is. Note that, for example, by making the rotating shaft of the electric motor and the transmission shaft connected thereto hollow, and connecting the rotating hollow shaft of the electric motor and the fixed vibrator for supplying adhesive with a coupling that allows relative rotation, it is possible to remove It is also possible to supply the adhesive directly into the discharge container via the coupling, the rotating hollow shaft, and the hollow transmission shaft opening into the discharge container.

44 is a slider to which the support beam 12 is fixed; 46 is a guide that guides the slider 44 in the vertical direction; 48 is a slider to which the support beam 12 is fixed;
This is a pneumatic cylinder that drives the support beam 12 up and down.

50 is a free flow conveyor device, 52 is a pallet conveyed by the free flow conveyor device 50, 5
4 is a support stand fixed to the pallet 52; 56 is a support stand fixed to the pallet 52;
The workpiece placed on the support stand 54 is a rotor hub for a spindle motor. 58 is a rotor hub 56
This is the reduced diameter inner circumferential surface (applied surface) to which the outer circumferential surface of the outer ring of the ball bearing is bonded.

Rotor hub 56 by free flow conveyor device 50
is conveyed to a predetermined position (then the pallet 52 is stopped at that position. Then, by operating the pneumatic cylinder 48 and lowering the support beam 12, the lower end of the discharge container 16 is compressed at the rotor hub 56. It is inserted in such a state that the reduced diameter inner circumferential surface 58, which is the application surface, is located at least on the extension line of the discharge hole 24 at a radial interval of 2 mm inside the radial inner circumferential surface 58, and as shown in FIGS. This will be the mode shown.

Thereafter, when the electric motor 10 starts rotating and reaches a substantially constant rotational speed, the valve of the liquid valve device 42 is opened for a certain period of time. Due to the air pressure applied through the vibrator 41, a large amount of the anaerobic adhesive 60 is discharged from the anaerobic adhesive supplying vibrator 30 into the interior 2 of the rotating dispensing container 16.
6.

The supplied anaerobic adhesive 60 is smoothly discharged almost in the direction of each discharge hole 24 over the entire circumference at a substantially constant speed through each discharge hole 24 due to the centrifugal force caused by the rotation of the discharge container 16, The coating is applied evenly over the entire circumference of the reduced-diameter inner peripheral surface 58 of the rotor hub 56.

After the supply of the anaerobic adhesive 60 is finished, if the rotation of the electric motor 10 is continued for a certain period of time, all of the supplied anaerobic adhesive 60 is discharged and quantitatively applied to the reduced diameter inner circumferential surface 58. be able to.

Further, if the electric motor 10 is stopped after all of the supplied anaerobic adhesive 60 has been discharged, dripping of the coating fluid at the external opening of the discharge hole 24 can be almost eliminated. Moreover, since the anaerobic adhesive 60 is applied to the reduced diameter inner circumferential surface 58, which is the application surface, in a non-contact manner, the application fluid is prevented from adhering to the external opening of the discharge hole 24 in the discharge container 16. .

The diameter of the discharge hole 24 can be selected as appropriate depending on various conditions such as the viscosity of the applied fluid, but the discharge container 16 has an outer diameter of about 12 mm, a maximum inner diameter (lower end) of about 10 mm, and an electric motor 10. When the rotation speed is 3000 rpm, 500 cp (2
When using the anaerobic adhesive 60 at a temperature of 5° C.), it was found that the diameter of the discharge hole 24 is preferably about 0.5° to 0.7°. More preferably, it was about 0.6 ms.

The main surface to be coated by this centrifugal coating device is the circular inner circumferential surface as in the above embodiment, but the surface to be coated can also be a circular arc surface or a flat surface. The adhesive used as the coating fluid is not limited to an anaerobic adhesive; for example, an ultraviolet curing adhesive may be used. Furthermore, it is of course possible to use materials other than adhesives as the coating fluid.

Note that, for example, there are two upper and lower parts on the reduced diameter inner peripheral surface 58 of the rotor hub 56
When bonding the outer rings of two ball bearings, first apply an anaerobic adhesive 60 to the lower part of the reduced diameter inner circumferential surface 58 to bond the outer ring of the lower ball bearing, and then glue the upper ball bearing. In order to do this, an anaerobic adhesive 60 is applied to the upper part of the reduced diameter inner peripheral surface 58. At this time, even if the anaerobic adhesive drips from the discharge hole 24, the fence disk 36 prevents it from being caught. This prevents problems caused by adhesion of anaerobic adhesive to the lower ball bearing.

[Effects of the Invention] In the centrifugal coating device of the present invention, by discharging the coating fluid supplied in a fixed amount to the receiving portion of the discharge container outward from the discharge container through the discharge hole by centrifugal force, the external opening of the discharge hole is To avoid dripping of the coating fluid and adhesion of the coating fluid (to apply the coating fluid uniformly and quantitatively over the entire circumference of the coating surface located on the outer peripheral side of the external opening of the discharge hole). This effectively prevents too much or too little coating amount, as well as protrusion or dripping of the coating fluid from the coating surface.

[Brief explanation of the drawing]

Figures 1 and 2 relate to an embodiment of the centrifugal coating device of the present invention, of which Figure 1 is a partially fragmented front schematic view, and Figure 2 is a fragmented sectional view enlarging the main part of Figure 1. It is. FIG. 3 is a sectional view showing a conventional coating means. In the drawing, 10 is an electric motor, 16 is a discharge container, 24 is a discharge hole, 26 is the inside of the discharge container, 28 is an upper opening, 30 is an anaerobic adhesive supply pipe, 40 is a syringe for supplying adhesive, 4
1 is a pneumatic vibrator, 42 is a liquid valve device, 56 is a rotor hub, 58 is a reduced diameter inner peripheral surface, and 60 is an anaerobic adhesive.

Claims (1)

[Claims] The discharge container includes a rotational drive means, a discharge container rotationally driven by the rotation drive means, and a supply means for supplying a fixed amount of the coating fluid, and the discharge container serves as a receiving section to which the coating fluid is supplied by the supply means. and a discharge hole that penetrates from the receiving part to the outside of the discharge container in a direction having a radially outward component centered on the rotation axis, and when the discharge container is rotationally driven, the discharge hole is supplied to the receiving part. A centrifugal coating device characterized in that a coating fluid is discharged through the discharge hole.