JP2020151670A - Apparatus for coating and coating method - Google Patents

Abstract

To provide an apparatus for coating and a coating method which effectively improve a coating quality of a coated body.SOLUTION: An apparatus for coating includes support units 21 to 28 for supporting a coated body 1, and a vibration generation device 35 which imparts predetermined vibration to the coated body while a coating material is applied to the coated body supported by the support units from a spray gun 50. While the coating material is applied to the coated body from the spray gun, the vibration generation device imparts the vibration to the coated body while changing frequency of the vibration in a range from frequency lower than specific frequency of the coated body to frequency higher than the specific frequency. The apparatus for coating further includes rotational force imparting means 30 for imparting a rotational force to the coated body and rotating the coated body while the coating material is coated to the coated body from the spray gun.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a coating device and a coating method, and more particularly to a technique suitable for coating vehicle parts.

Generally, parts such as propeller shafts, drive shafts, and transmissions are painted in the painting process during vehicle manufacturing. For example, Patent Document 1 discloses a step of assembling a connecting shaft for connecting a plurality of shafts as a unit in advance and applying an anticorrosion paint to the assembled unit.

JP-A-2017-141891

As an example of the above parts, for example, a flange yoke portion of a universal joint for connecting to other parts is joined to the propeller shaft at the end of the shaft, and a balance weight for adjusting the rotational balance on the outer circumference of the shaft. Is attached. Unevenness due to welding remains at the joint portion between the shaft end portion and the flange yoke portion, and there is a minute gap between the outer circumference of the shaft and the balance weight.

Therefore, if the painting process is performed after assembling the propeller shaft as a unit in advance, the paint does not flow into the gap between the outer circumference of the shaft and the balance weight, or the unevenness of the joint portion between the shaft end and the flange yoke is coated. Due to the foaming of the film, each of these parts may be left as an unpainted part. If such an unpainted portion is left, rust or rust juice traces are generated from the portion, which causes deterioration of coating quality.

The technique of the present disclosure aims to effectively improve the coating quality of the object to be coated.

The coating apparatus of the present disclosure applies a predetermined vibration to the support unit that supports the object to be coated and the object to be coated while the paint is applied to the object to be coated supported by the support unit from the paint spraying means. It is characterized by comprising a vibration imparting means for imparting vibration.

Further, the vibration applying means has a natural frequency of the object to be coated from a frequency lower than the natural frequency of the object to be coated while the paint is applied to the object to be coated by the paint spraying means. It is preferable to apply vibration while changing the frequency of vibration in a range up to a higher frequency.

Further, it is preferable to further provide a rotational force applying means for applying a rotational force to the object to be coated to rotate the object to be coated while the paint is applied to the object to be coated by the paint spraying means.

The coating method of the present disclosure is a method of coating an object to be coated supported by a support unit, and vibration is applied to the object to be coated while the paint is applied to the object to be coated supported by the support unit from a paint spraying means. It is characterized in that a predetermined vibration is applied from the means.

Further, while the paint is applied to the object to be coated by the paint spraying means, the range from a frequency lower than the natural frequency of the object to be coated to a frequency higher than the natural frequency of the object to be coated is applied to the object to be coated. It is preferable to apply vibration from the vibration applying means while changing the frequency of vibration.

According to the technique of the present disclosure, the coating quality of the object to be coated can be effectively improved.

It is a schematic diagram which shows the propeller shaft unit which is an example of the object to be coated which concerns on this embodiment. It is a schematic overall block diagram of the coating apparatus which concerns on 1st Embodiment. It is a schematic partial sectional view which shows the main part of the shaft unit fixing part which concerns on 1st Embodiment. It is a schematic cross-sectional view which shows the shaft and the balance weight of the propeller shaft unit which concerns on this embodiment cut out in the radial direction. It is a schematic overall block diagram of the coating apparatus which concerns on 2nd Embodiment. It is a schematic overall block diagram of the coating apparatus which concerns on 3rd Embodiment.

Hereinafter, the coating apparatus and the coating method according to the present embodiment will be described with reference to the attached drawings. The same parts have the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[Painted body]
FIG. 1 is a schematic view showing a propeller shaft unit 1 which is an example of a body to be coated according to the present embodiment. Hereinafter, the propeller shaft unit 1 will be used as the object to be coated, but the present disclosure is not limited to this, and the present disclosure can be applied to other parts such as a drive shaft unit and a transmission.

The propeller shaft unit 1 includes a propeller shaft 2 and a universal joint 5 connected to each of both ends of the propeller shaft 2 and connected to other members on each side.

The propeller shaft 2 has a first shaft 3 and a second shaft 4 that is slidably inserted and arranged in the axial direction with respect to the first shaft 3. The universal joint 5 includes a first flange yoke portion 6 provided at each end of each of the shafts 3 and 4, a second flange yoke portion 7 connected in contact with other members, and flange yoke portions 6 and 7. Has a spider 8 for interconnecting the.

Reference numeral 9 is a snap ring for holding the spider 8 to the flange yoke portions 6 and 7, reference numeral 11 is a balance weight attached to the outer periphery of the shafts 3 and 4, and reference numeral 12 is a shaft 3 and 4 and the first flange. The welded parts with the yoke portion 6 are shown respectively.

The propeller shaft unit 1 is unitized by joining the first flange yoke portion 6 of the universal joint 5 to the ends of the shafts 3 and 4 by welding and assembling the second shaft 4 to the first shaft 3. The unitized propeller shaft unit 1 is mounted on a balance measuring device (not shown), and the balance weights 11 are attached to the outer circumferences of the shafts 3 and 4 by spot welding or the like, and then the process proceeds to the painting process. In the painting process, the painting device 20 of the present embodiment described below is used.

[First Embodiment]
FIG. 2 is a schematic overall configuration diagram of the coating apparatus 20 according to the first embodiment.

As shown in FIG. 2, the coating device 20 includes a base portion 21, a first support wall 22, a second support wall 23, a first rotating shaft 24 and a second rotating shaft 25, and a shaft unit fixing portion 26. , The motor 30 and the vibration generator 35 are provided. The base portion 21, the first support wall 22, the second support wall 23, and the shaft unit fixing portion 26 are examples of the support unit of the present disclosure. The motor 30 is an example of the rotational force applying means of the present disclosure, and the vibration generator 35 is an example of the vibration applying means of the present disclosure.

The base portion 21 is a trapezoidal member whose longitudinal direction is longer than the axial length of the propeller shaft unit 1. A first support wall 22 and a second support wall 23 are erected on both ends of the base portion 21 in the longitudinal direction.

The first support wall 22 and the second support wall 23 are arranged to face each other at a distance longer than the axial length of the propeller shaft unit 1. The first rotating shaft 24 is rotatably supported by the first support wall 22, and the second rotating shaft 25 is rotatably supported by the second support wall 23.

The motor 30 is provided on the end side of the base portion 21 with respect to the first support wall 22. A drive pulley 32 is integrally rotatably provided on the motor shaft 31 of the motor 30, and a driven pulley 29 is integrally rotatably provided on the first rotating shaft 24. An endless belt 33 is hung on these pulleys 29 and 32 so that the rotational force of the motor 30 can be applied to the first rotating shaft 24.

The vibration generator 35 is a device that applies vibration to the propeller shaft unit 1, such as an ultrasonic oscillator, and is connected to the second rotating shaft 25 in the illustrated example. The specific configuration and installation position of the vibration generator 35 are not particularly limited as long as the configuration and installation position can at least apply vibration to the propeller shaft unit 1. In the present embodiment, the vibration generator 35 continuously transmits vibrations from a vibration frequency band lower than the natural frequency of the propeller shaft unit 1 to a vibration frequency band higher than the natural frequency with respect to the propeller shaft unit 1. Those that can be given to are used.

The shaft unit fixing portion 26 fixes the second flange yoke portion 7 of the propeller shaft unit 1 to the first rotating shaft 24 and the second rotating shaft 25, respectively. Specifically, the shaft unit fixing portion 26 is a second flange yoke portion between the rotating plate 27, which is integrally rotatably fixed to the first rotating shaft 24 (or the second rotating shaft 25), and the rotating plate 27. It has a sandwiching portion 28 for sandwiching 7.

As shown in FIG. 3, the sandwiching portion 28 includes a frame portion 28A that penetrates the rotating plate 27 in the axial direction, and a pressure contact portion 28B that extends from an end portion of the frame portion 28A on the back side of the second flange yoke portion 7. A bolt mounting portion 28D extending from an end of the frame portion 28A opposite to the second flange yoke portion 7 side and having a threaded hole 28C formed through the frame portion 28A, and a bolt 28E screwed into the screw hole 28C of the bolt mounting portion 28D. And, which is provided on the side opposite to the second flange yoke portion 7 side of the bolt 28E, is attached to the bolt head 28F for rotating the bolt 28E and the second flange yoke 7 side of the bolt 28E, and is pushed by the bolt 28E. It is provided with a holding plate 28G for transmitting pressure to the rotating plate 27.

According to the holding portion 28, by rotating the bolt 28E, the distance between the bolt mounting portion 28D and the holding plate 28G (the width in the axial direction between the holding plate 28G and the pressure welding portion 28B) can be changed, and the rotating plate 27 and the rotating plate 27 The second flange yoke portion 7 is configured so that it can be easily fixed and removed from the pressure contact portion 28B.

[Painting method]
Next, a coating method for coating the propeller shaft unit 1 using the coating device 20 according to the present embodiment will be described.

First, as shown in FIG. 2, the propeller shaft unit 1 is attached to the coating device 20. Specifically, both ends of the propeller shaft unit 1 are fixed by the shaft unit fixing portions 26 on the respective sides.

Next, the motor 30 and the vibration generator 35 are driven. As a result, the rotational force is transmitted from the motor shaft 31 to the first rotating shaft 24 via the drive pulley 32, the belt 33, and the driven pulley 29, and the propeller shaft unit 1 attached to the first rotating shaft 24 rotates. Further, the vibration is transmitted from the vibration generator 35 to the second rotating shaft 25, and the vibration is applied to the propeller shaft unit 1 attached to the second rotating shaft 25. The timing of driving the motor 30 and the vibration generator 35 may be simultaneous or one of them may be driven first.

Next, in a state where the propeller shaft unit 1 is rotated and vibrated, paint is sprayed from the spray gun 50 (an example of the paint spraying means), and the spray gun 50 is moved in the axial direction of the propeller shaft unit 1 (left-right direction in the figure). Move back and forth. For example, the spray gun 50 is reciprocated a plurality of times until a desired layer of paint is formed on the propeller shaft unit 1. For painting with the spray gun 50, the painting operator may directly operate the spray gun 50, or the painting device 20 is provided with a mechanism for moving the spray gun 50 in the axial direction. A control device may be used to control the movement of the spray gun 50 and the injection of paint.

In the present embodiment, the propeller shaft unit 1 is driven by the motor 30 until the desired paint layer is formed on the propeller shaft unit 1, in other words, while the paint is applied from the spray gun 50 to the propeller shaft unit 1. While continuously rotating, the vibration generator 35 continuously transmits the vibration to the propeller shaft unit 1 while sweeping it. The sweep range is preferably from a vibration frequency band lower than the natural frequency of the propeller shaft unit 1 to a vibration frequency band sufficiently higher than the natural frequency.

That is, while the natural frequency of the propeller shaft unit 1 and the vibration frequency transmitted from the vibration generator 35 match and become a resonance state, vibration in a relatively high frequency band is transmitted to the propeller shaft unit 1. In any case during this period, the fluidization of the paint applied to the propeller shaft unit 1 is effectively promoted. As a result, for example, the gap S between the outer circumference of the shaft 3 (or the shaft 4) shown in FIG. 4 and the back surface of the balance weight 11, or the gap between the snap ring 9 shown in FIG. 1 and the flange yoke portions 6 and 7. It is possible to reliably pour the paint into the flange. Further, it is possible to surely promote the defoaming action of the coating film applied to the welded portion 12 between the shafts 3 and 4 and the first flange yoke portion 6 shown in FIG. Further, by sweeping and transmitting the vibration from the low frequency band to the high frequency band, it is possible to flatten the coating film applied to the propeller shaft unit 1.

After the required layer of paint is formed on the propeller shaft unit 1, the spray gun 50 finishes spraying the paint, preferably until the paint formed on the propeller shaft unit 1 dries. Continue the rotation and vibration of 1.

As described above, according to the present embodiment, the propeller shaft unit 1 is attached to the painting device 20 and the vibration generator 35 is driven while the paint is applied from the spray gun 50, whereby the propeller shaft unit 1 is subjected to. It is configured to transmit vibrations having a frequency higher than the natural frequency from a frequency lower than the natural frequency of the propeller shaft unit 1 while sweeping.

That is, the fluidization of the paint applied to the propeller shaft unit 1 is promoted both while the propeller shaft unit 1 is in the resonance state and further while the propeller shaft unit 1 vibrates at a relatively high frequency. Will be. As a result, the paint flows into each gap of the propeller shaft unit 1, and further, the defoaming action of the coating film applied to the welded part or the like is promoted, and each of these parts is left as an unpainted part. Can be reliably prevented. Further, since no unpainted portion remains on the propeller shaft unit 1, it is possible to effectively prevent rust and rust juice traces from the portion, and it is possible to surely improve the coating quality.

[Second Embodiment]
FIG. 5 is a schematic overall configuration diagram of the coating apparatus 20 according to the second embodiment.

In the coating device 20 of the second embodiment, at least a pair of support portions 200 capable of supporting the propeller shaft unit 1 are provided on the upper surface of the base portion 21, and the vibration generator 35 is attached to the base portion 21 to attach the propeller shaft. The unit 1 is configured so that vibration can be applied from the base portion 21 to the unit 1 via the support portion 200.

When the coating device 20 of the second embodiment is used, the vibration generator 35 is driven to drive the propeller shaft unit 1 while the paint is applied from the spray gun 50 to the propeller shaft unit 1 as in the first embodiment. The vibration is transmitted while sweeping. When the painting of the portion of the propeller shaft unit 1 facing the spray gun 50 is completed, the remaining portion may be painted by inverting the propeller shaft unit 1 and placing it on the support portion 200 again.

Also in this case, by effectively promoting the fluidization of the paint applied to the propeller shaft unit 1, it is possible to effectively prevent the unpainted portion from being left on the propeller shaft unit 1 as in the first embodiment. It becomes possible to surely improve the coating quality.

[Third Embodiment]
FIG. 6 is a schematic overall configuration diagram of the coating apparatus 20 according to the third embodiment.

In the coating device 20 of the third embodiment, a hanging arm portion 210 having a length higher than the axial length of the propeller shaft unit 1 is erected on the upper surface of the base portion 21, and the propeller shaft unit 210 is erected on the hanging arm portion 210. 1 is attached, and the vibration generator 35 is attached to the base portion 21 so that vibration can be applied to the propeller shaft unit 1 via the hanging arm portion 210.

When the coating device 20 of the third embodiment is used, the vibration generator 35 is driven to drive the propeller while the paint is applied from the spray gun 50 to the propeller shaft unit 1 as in the first and second embodiments. The vibration is transmitted to the shaft unit 1 while being swept. When the painting of the portion of the propeller shaft unit 1 facing the spray gun 50 is completed, the propeller shaft unit 1 suspended from the hanging arm portion 210 is rotated (or the position of the spray gun 50 is changed). , The rest should be painted.

In this case as well, the fluidization of the paint applied to the propeller shaft unit 1 is effectively promoted, so that an unpainted portion is left on the propeller shaft unit 1 as in the first and second embodiments. It is possible to prevent the coating quality, and the coating quality can be surely improved.

[Other]
It should be noted that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the gist of the present disclosure.

For example, the application of the above embodiment is not limited to the painting of parts performed in the manufacturing process of the vehicle, but is also widely applied to the painting during maintenance of the vehicle or the painting of parts of other devices other than the vehicle. Is possible.

1 Propeller shaft unit 2 Propeller shaft 3 1st shaft 4 2nd shaft 5 Universal joint 6 1st flange yoke part 7 2nd flange yoke part 8 Spider 9 Snap ring 11 Balance weight 20 Painting device 21 Base part (support unit)
22 First support wall (support unit)
23 Second support wall (support unit)
24 1st rotation shaft (support unit)
25 Second rotation shaft (support unit)
26 Shaft unit fixing part (support unit)
30 motor (rotational force transmission means)
35 Vibration generator (vibration imparting means)
50 Spray gun (paint spraying means)

Claims (5)

A support unit that supports the object to be painted and
A coating device comprising: a vibration applying means for applying a predetermined vibration to the object to be coated while the paint is applied to the object to be coated supported by the support unit from the paint spraying means. The vibration applying means has a frequency lower than the natural frequency of the object to be coated and a frequency higher than the natural frequency of the object to be coated while the paint is applied to the object to be coated by the paint spraying means. The coating device according to claim 1, wherein vibration is applied while changing the frequency of vibration in a range up to a high frequency. The invention according to claim 1 or 2, further comprising a rotational force applying means for applying a rotational force to the object to be coated to rotate the object to be coated while the paint is applied to the object to be coated from the paint spraying means. Painting equipment. It is a method of painting the object to be painted supported by the support unit.
A coating method comprising applying a predetermined vibration to the object to be coated by the vibration applying means while the paint is applied to the object to be coated supported by the support unit from the paint spraying means. While the paint is applied to the object to be coated by the paint spraying means, the object to be coated vibrates in a range from a frequency lower than the natural frequency of the object to be coated to a frequency higher than the natural frequency. The coating method according to claim 4, wherein vibration is applied from the vibration applying means while changing the frequency of the above.

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