JP3080168B2 - Painting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, a coating method for automatically coating a vehicle body while relatively moving the vehicle body and a coating apparatus.

[Prior Art] When painting an object to be painted, for example, a car body,
A method of injecting paint from a coating means which reciprocates in a direction intersecting the transport direction while moving the workpiece at a constant transport speed by a conveyor or the like is adopted.

In this case, since the width to be coated in the reciprocating direction of the coating means changes at the side portion and the upper portion of the vehicle body, there is a possibility that the thickness of the coating film on the entire object to be coated becomes uneven.

Therefore, a method of changing the reciprocating range and the reciprocating speed of the coating means according to the change of the coating width (see JP-A-63-209770), A method of changing the injection amount and adjusting the number of rotations of the bell and the shaving air pressure
-234970) and the like.

[Problems to be Solved by the Invention] However, in each of the above-described prior arts, the reciprocating speed, the injection amount, and the like of the coating means must be changed according to the change in the width to be coated. It has become. In addition, this kind of change in the coating conditions is not performed in a very short time, so that there is a problem that the coating operation cannot be performed continuously and with high accuracy.

An object of the present invention is to solve this kind of problem, and an object of the present invention is to provide a coating method capable of easily and accurately coating the entire object to be coated even when the width of the object to be coated changes. I do.

Means for Solving the Problems In order to achieve the above object, the present invention provides a process of moving an object to be coated and a coating device at a constant relative speed, and a coating means provided in the coating device. The process of reciprocating in a direction intersecting the moving direction moving at the relative speed, and when the reciprocating range of the coating means corresponding to the object to be coated is enlarged or reduced, the relative speed in the moving direction is increased. And a process of decreasing or increasing.

[Operation] In the coating method according to the present invention described above, while moving the object to be coated and the coating device at a constant relative speed, the coating means provided in the coating device is moved in a direction intersecting the moving direction. To reciprocate to paint. Then, when the reciprocating range of the coating means corresponding to the object to be coated is expanded, the relative speed is reduced to prevent the thickness of the coating film from becoming thin. This makes it possible to form a uniform coating film on the whole object without performing complicated control.

[Examples] The coating method according to the present invention will be described in detail below with reference to the accompanying drawings by way of examples in connection with an apparatus for performing the method.

In FIG. 2, reference numeral 10 indicates a coating apparatus for performing the coating method according to the present embodiment. This coating equipment 10
Applies a predetermined coating to the entire surface of the bonnet 16, the roof 20, and the trunk cover 24 of the vehicle body 14 conveyed by the vehicle body conveying mechanism 12 provided along the painting line.

The coating apparatus 10 includes a rail section 30 disposed in parallel with the vehicle body transport mechanism 12, a rack member 32 is provided on the rail section 30, and a rack motor 32 fixed to a casing 34 A pinion 38 meshing with the member 32 is connected.

In the casing 34, a ball screw
40 and four guide rods 42 are supported, and the upper end of the ball screw 40 is connected to the drive shaft of a lifting / lowering motor 44.
The holding body 46 is engaged with the ball screw 40 and the guide rod 42,
A gear 50 is connected to a turning motor 48 fixed to the holder 46, and the gear 50 meshes with a gear 54 fixed to one end of the turning shaft 52. The other end of the turning shaft 52 projects out of the casing 34 and fixes one end of the turning arm 56.

A substantially cylindrical holding member 58 is engaged with the other end of the swing arm 56 in the vehicle width direction (the directions of arrows E and F) of the vehicle body 14, and a guide rail 60 formed on the holding member 58 is provided.
In addition, a slide sleeve 62 is supported via a drive mechanism 64 so as to be able to advance and retreat in the directions of arrows E and F.

As shown in FIGS. 3 and 4, the drive mechanism 64 includes a servomotor 66, and the ball screw 70 is rotationally driven via a belt pulley means 68 connected to the servomotor 66. The ball screw 70 fits into a ball nut 72 fixed to the slide sleeve 62.

An attachment member 74 is fixed to the slide sleeve 62, and a coating gun 76 is attached to the attachment member 74. The slide sleeve 62 has cutouts 78a, 78b formed on both sides of the mounting member 74, and the nuts 82a, 82b of the support members 80a, 80b face the slide sleeve 62 via the cutouts 78a, 78b. The ends of the support members 80a and 80b engage with the guide rail 60, and the coating guns 84a and 84b are mounted on the support members 80a and 80b.

A first ball screw 86a, which is a right-hand thread, and a second ball screw 86b, which is a left-hand thread, are coaxially and integrally supported on the slide sleeve 62.
86a and 86b are fitted into the nut portions 82a and 82b. A gear 88 is fixed to the other end of the first ball screw 86a.
8 meshes with the gear 90 supported by the slide sleeve 62. The gear 90 is fixed to a rotating body 92, and a spline shaft 94 fits into the rotating body 92, and the spline shaft 94 is connected to a rotation drive source 96.

An apparatus for performing the coating method according to the present embodiment is configured as described above. Next, the operation thereof will be described with reference to FIG.

The coating guns 76, 84a and 84b are arranged in advance in a state facing the front surface of the hood 16 of the vehicle body 14, and the front surface of the hood 16 of the vehicle body 14 transported via the vehicle body transport mechanism 12 is the coating gun. At a point in time when a predetermined distance has been reached with respect to 76, 84a and 84b, the injection of paint is started (FIG. 5a
reference).

That is, under the driving action of the servomotor 66 constituting the driving mechanism 64, the slide sleeve 62 is moved in the vehicle width direction (the directions of arrows E and F) via the ball screw 70 and the ball nut 72.
Reciprocating within the reciprocating range S1 and the lifting motor 44
Is driven, and the turning arm 56 rises in the direction of arrow D at the speed V1. Further, the casing 34 travels in the direction of arrow C at the same speed as the vehicle body 14 via the pinion 38 and the rack 32 under the driving action of the traveling motor 36. As a result, the paint guns 76, 84a and 84b
The coating is performed in a state where is separated by a predetermined interval.

When the painting of the front of the bonnet 16 is completed, the turning arm 56 turns in the direction of arrow B under the driving action of the turning motor 48, and the coating guns 76, 84a and 84b move the bonnet of the vehicle body 14.
Orient perpendicular to 16. By controlling the traveling motor 36, the vehicle body 14 conveyed through the vehicle body conveying mechanism 12 is controlled.
And the paint guns 76, 84a and 84b are moved in the direction of arrow C at a relative speed V1. Thus, the upper surface of the bonnet 16 is painted under the same conditions as the above-described painting of the front surface of the bonnet 16.

After the bonnet 16 has been completely painted, the lifting motor
44 is driven, the pivot arm 56 is displaced in the direction of arrow D, and the paint guns 76, 84a and 84b are moved.
Are displaced in directions approaching each other corresponding to the width of the roof 20 to be coated. That is, the spline shaft 94 is rotated in a predetermined direction under the driving action of the rotary drive source 96, and the first spline shaft 94 is rotated via the rotating body 92 fitted into the spline shaft 94.
And the second ball screws 86a and 86b rotate. For this reason,
The support members 80a, 80b are displaced integrally with the coating guns 84a, 84b in a direction approaching each other.

As shown in FIG. 5b, the paint guns 76, 84a and 84b
When the vehicle reaches the end of the roof 20 of the vehicle body 14, the turning motor 48
Under the driving action of these paint guns 76, 84a and 84b,
The paint is injected toward the roof 20 at a substantially right angle.
At this time, the painting guns 76, 84a and 84b are
The body 14 and the paint gun 7 are displaced in the reciprocating range S2 smaller than the reciprocating range S1 in the directions of arrows E and F under the action of
6, 84a and 84b, relative speed V higher than relative speed V1
The roof 20 is painted by moving it in the direction of arrow C at 2.

Next, the trunk cover 24 is
(See FIG. 5c).

In this case, according to the present embodiment, when the bonnet 16 is painted, the painting guns 76, 84a and 84b are turned by the arrows E and F.
While being displaced in the reciprocating range S1 in the direction, it is moved in the direction of arrow C while maintaining the relative speed V1 with respect to the vehicle body 14. On the other hand, when painting the roof 20, painting guns 76, 84a and 84b
Is displaced in the reciprocating range S2 in the directions of arrows E and F, and is moved in the direction of arrow C while maintaining the relative speed V2 with the vehicle body 14. Then, these reciprocating ranges S1, S2 and the relative speed V
1, V2 satisfies the relationship of V1 × S1 / S2 = V2.

Therefore, as shown in FIG. 1, since S1> S2, V1
<V2, so that it is possible to prevent the roof 20 having a smaller area to be painted than the hood 16 from being coated with more paint than necessary. That is, if V1 = V2, the amount of paint injected through the coating guns 76, 84a and 84b becomes larger on the roof 20 than on the bonnet 16 because of the relationship of S1> S2,
Although the thickness of the coating film becomes uneven, in this embodiment,
Such inconvenience does not occur.

Moreover, complicated control such as adjusting the injection amount of the paint in accordance with the change of the reciprocating range becomes unnecessary, and the entire vehicle body 14 can be painted with high precision and efficiency by an extremely simple method. The effect is obtained.

Note that the front pillar and the rear pillar of the vehicle body 14 may be continuously painted by the painting guns 84a and 84b.

Further, a side coating device for coating the side portion of the vehicle body 14 may be provided side by side with the coating device 10, and the side coating device may be driven in the same manner as the coating device 10.

[Effects of the Invention] As described above, the coating method according to the present invention has the following effects and advantages.

While moving the object to be coated and the coating device at a constant relative speed, the coating means provided in the coating device is reciprocated in a direction intersecting the moving direction to perform the coating, and The relative speed is reduced or increased when the reciprocating range of the coating means corresponding to the object is enlarged or reduced. Accordingly, the thickness of the coating film does not change due to the change in the reciprocating range, and a uniform coating film can be formed on the entire object to be coated. In addition, there is no need to perform complicated control such as control of the paint injection amount, and the painting operation can be performed simply and efficiently.

[Brief description of the drawings]

1 is an explanatory view of a coating method according to the present invention, FIG. 2 is a partially sectional front view of an apparatus for carrying out the method, and FIG. 3 is an enlarged perspective view of a main part of the coating apparatus shown in FIG. Fig. 4 is a partial cross-sectional front view of the main part, and Figs. 5a to 5c are plan views showing the explanation of the painting operation. 10 ... Coating device 12 ... Car body transfer mechanism 14 ... Car body 34 ... Casing 56 ... Swivel arm 62 ... Slide sleeve 64 ... Drive mechanism 76, 84a, 84b ... Coating gun

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Murayama 1-10-1 Shinsayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd. (72) Eiji Kikuchi 1-10-1 Shinsayama, Sayama City, Saitama Honda Engineering Inside (72) Inventor Daisuke Kiriishi 1-1-10 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A-63-209770 (JP, A) JP-A-1-297169 ( JP, A) JP-A-59-21670 (JP, A)

Claims (3)

(57) [Claims] 1. A process of moving an object to be coated and a coating device at a constant relative speed, and reciprocating a coating means provided in the coating device in a direction intersecting a moving direction of moving at the relative speed. Moving the, the reciprocating range of the coating means corresponding to the object to be coated, when expanding or contracting, the relative speed in the moving direction,
A coating method, comprising: decreasing or increasing. 2. The method according to claim 1, wherein the relative speed V1 in the reciprocating range S1 of the coating means and the reciprocating range of the coating means.
A coating method characterized by satisfying a relation of V1 × S1 / S2 = V2 with the relative speed V2 in S2. 3. The method according to claim 1, wherein the plurality of coating means are arranged in a reciprocating direction, and an interval between the respective coating means is changed corresponding to an object to be coated. How to paint.