JPH0857401A - Horizontally parting coating method for recessed bending surface to be coated - Google Patents

Abstract

PURPOSE: To provide a horizontally parting coating method for a recessed bending surface to be coated in which automatic coating of given film thickness on a given horizontally parting position by the fixed coating gun distance is performed by straight traveling even for a recessed bending surface to be coated. CONSTITUTION: A coating gun for spraying a coating material in a spray pattern of vertically long oval shape travels straight in the axial direction crossing rectangularly the spray axial line direction with the shortest distance section to a surface to be coated of recessed bending shape as the reference distance, and coating is carried out by the vertical spray pattern PA on the surface to be coated of the shortest distance section, while the coating gun is rotated as the distance between the surface to be coated and the coating gun is increased. The longitudinal direction end of vertically long oval shape of the oblique spray pattern PB is coated at an angle conforming to a horizontal parting line 12 in the coating of the above vertical spray pattern PA.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal parting coating method for a concave curved surface to be coated.

[0002]

2. Description of the Related Art As shown in FIG. 1, a rocker portion 2 of an automobile body 1 has a concavely curved shape. The locker portion 2 is painted with a predetermined vertical width.

[0003]

A general rocker portion is a linear shape, and in order to coat this portion, a coating gun for spraying a paint in a constant vertical elliptical spray pattern is applied to the linear rocker portion. A straight horizontal parting coating can be obtained by running straight in parallel at a constant distance. In the case of the concave curved rocker portion 2 shown in FIG. 6, the coating gun 5 is applied to the concave curved rocker portion 2. Therefore, it is necessary to travel LC by following the concave curved shape of the rocker portion 2 at a constant distance C.

However, when the coating gun 5 is run LC with respect to the concavely curved rocker portion 2 at a constant distance C following the concave curved shape of the rocker portion 2, the distance A between the shallow portion of the concave curved surface and the distance between the deep portion of the concave curved surface. In B, the spraying distance of the coating gun 5 is short at the distance A at the shallow portion of the concave curved surface and long at the distance B at the deep portion.

Due to the change in the spray distance of the coating gun 5, the distance A of the shallow portion of the concave curved surface is changed as shown in FIG.
Shows a vertical elliptical short spray pattern PD, and a deep portion distance B has a long vertical elliptical spray pattern PE.
Therefore, the parting position 15 becomes a vertical step, and the coating of the surface to be coated at the distance A of the shallow portion of the vertically long elliptical short spray pattern PD becomes a thick film, resulting in an uneven coating film as a whole. The problem occurs.

It is an object of the present invention to provide a horizontal parting coating method for a concave curved surface to be coated which solves the above-mentioned conventional problems.

[0007]

Means for Solving the Problems The gist of the present invention for achieving the above object is to provide a coating gun for spraying a paint in a vertically elongated elliptical spray pattern with a shortest distance portion with respect to a concave curved surface to be coated. It runs straight in the axial direction orthogonal to the spray axis direction as the reference distance, and on the coated surface of the shortest distance part, the spray pattern is painted in a vertically elongated elliptical shape in the vertical direction, and the coated surface is a distance from the coating gun. The coating gun is rotated in accordance with the increase, and the longitudinal end of the vertically elongated elliptical shape of the spray pattern is inclined and coated at an angle corresponding to a horizontal parting line in the spray pattern coating with the vertically elongated elliptical shape. To do.

[0008]

By the above method, even if the surface is a concave curved surface, by changing the vertical elliptical spray pattern angle by the coating gun at a fixed gun distance according to the concave curved surface,
It enables coating with a constant horizontal parting position and a constant film thickness.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an automobile body, 2 is a concave rocker part to which horizontal parting coating is applied, 3 is a coating device for horizontally parting the rocker part 2, 4 is the coating device 3 in the spray axis direction. It is a guide rail that travels in a straight line in the orthogonal axis directions.

As shown in FIG. 2, the coating device 3 includes a coating gun 5 rotatably held by a rotary joint 8, a servomotor 6 having an encoder 7, and
The coating gun 5 includes gears 11a and 11b for transmitting the rotation angle of the servo motor 6 to the coating gun 5.
Is connected to the paint supply device 9, and the encoder 7 is connected to the controller 10.

In the coating device 3 having the above-mentioned structure, the coating gun 5 sprays the coating material in a vertically elongated elliptical spray pattern toward the surface to be coated of the concavely curved rocker portion 2 and is orthogonal to the spray axis direction. While linearly traveling on the guide rail 4 in the axial direction, the coating gun 5 is rotated by the controller 10, the encoder 7, and the servomotor 6 to control the longitudinal ellipse-shaped longitudinal axis of the spray pattern to a vertical angle and an inclination angle. To do.

According to the present invention, the rocker portion 2 having a concave curved shape is horizontally parted and coated by the following method by the coating device 3 performing the above operation. That is, as shown in FIG. 3, the coating gun 5 traveling straight L on the guide rail 4 has a fixed gun distance line 14 fixed to the rocker portion 2.
To move. However, the spray distance changes short at the distance A at the shallow portion of the concave curved surface and becomes long at the distance B at the deep portion.

Therefore, as shown in FIGS. 4 and 5, the surface to be coated at the shortest distance of the distance A of the shallow portion of the concave surface is painted in a vertically elongated elliptical shape of the vertical spray pattern PA, and the surface to be coated is painted. The coating gun 5 is rotated as it moves from the gun 5 to a deeper portion where the distance increases, and the longitudinal end of the vertically elongated elliptical shape of the inclined spray pattern PB is inclined so as to match the horizontal parting line 12 in the coating of the vertical spray pattern PA. Angle, eg 0 ° to 29 °, 35 °, 2 depending on the depth of the concave surface
Paint by changing the inclination angle such as 9 ° and 0 °.

As a result, the distance B of the portion where the spray distance is deep is
In the vertical spray pattern PA of the shallow distance A, the vertical dimension of the vertical spray pattern PA is larger than the vertical elliptical shape of the vertical spray pattern PA by the inclined spray pattern PB and becomes the same vertical dimension H as the vertical spray pattern PA. A coating that matches the parting line 12 and the lower end line 13 of the rocker portion can be obtained.

In the case of a linear rocker portion, horizontal parting coating can be performed by the vertical spray pattern PA without controlling the rotation of the coating gun 5, and according to the method of the present invention, the automobile body of the above embodiment is used. The locker unit 2 is not limited to one.

[0016]

As described above, according to the present invention, even in the case of a concave curved surface to be coated, the spray pattern angle of the oblong elliptical shape by the coating gun is changed according to the concave curved surface at a fixed gun distance by straight running. By doing so, automatic coating with a constant horizontal parting position and a constant film thickness is possible, and one coating device can follow the coated surface with different curved surfaces and the coated surface with a linear shape, so capital investment and Installation space can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the method of the present invention.

[Figure 2] Plan view of the coating device

FIG. 3 is a plan view of a horizontal parting coating procedure for a concave curved surface to be coated by the method of the present invention.

FIG. 4 is an explanatory view showing an angle change of a spray pattern by the method of the present invention.

FIG. 5 is a front view of a horizontal parting coating procedure on a concave curved surface to be coated by the method of the present invention.

FIG. 6 is a plan view of horizontal parting coating when the coating gun is run following the concave curved surface to be coated.

FIG. 7 is an explanatory diagram of problems when the coating gun is made to travel along a concave curved surface to be coated.

[Explanation of symbols]

 1 Car Body 2 Rocker Part 3 Coating Device 4 Guide Rail 5 Coating Gun 6 Servo Motor 7 Encoder 8 Rotary Joint 9 Paint Supply Device 10 Controller 12 Horizontal Parting Line PA Vertical Spray Pattern PB Inclined Spray Pattern

Claims (1)

[Claims] 1. A coating gun for spraying paint in a vertically elongated elliptical spray pattern travels linearly in an axial direction orthogonal to the spray axial direction with the shortest distance portion as a reference distance with respect to a concave surface to be coated, On the surface to be coated at the shortest distance, the spray pattern is painted in a vertically elongated elliptical shape in the vertical direction, and the coating gun is rotated as the distance between the coating gun and the coating gun increases. A horizontal parting coating method for a concave curved surface to be coated, characterized in that the direction ends are inclined at an angle corresponding to a horizontal parting line in the spray pattern coating of the vertical elliptical shape in the vertical direction.