JPS583751B2 - Spray painting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray coating method for spraying paint while masking the non-painted portions of a workpiece.

Generally, when spray painting a part of the object to be painted, masking paper is pasted on the part that does not need to be painted, and after the paint is sprayed, the masking paper is peeled off after drying. The amount consumed increases in proportion to the quantity, and a lot of manual labor is required for pasting and peeling.As one of the countermeasures, as shown in Figure 2, a masking plate a is used instead of masking paper. may be placed close to the front of the object to be painted (b) to perform spray painting.

However, a part of the paint sprayed from the paint gun C toward the object b is sprayed onto the surface of the masking plate a and deposited on the lower edge d, making it easy to form paint drops e. is blown away by the spray pressure of the paint gun c, so that the paint splashes f, f...
It has the disadvantage of contaminating the

The present invention has been made in view of these drawbacks, and in order to prevent staining of non-painted parts, paint splashes scattered from the lower edge of the masking plate can be removed from the middle of the gap provided between the masking plate and the object to be painted. Focusing on the fact that it is sufficient to capture the paint in the middle part, we provide a spray painting method that interposes a secondary plate parallel to the masking plate in the intermediate part to catch paint splashes and block overspray to non-painted parts. The purpose is to

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 denotes an object to be painted, such as a side sill of an automobile, and a bottom portion 2 of the object to be painted is coated with a paint 3 (eg, vinyl chloride paint) for protecting the bottom portion.

Reference numeral 4 denotes a masking member in which a first masking plate 5 and a second masking plate 6 are arranged with a distance between them and their respective edges 9 and 12 are parallel to each other.

Paint 3 from the painting gun 7 is placed close to the front of the object 1 to be painted.
A first masking plate 5 is disposed to block the non-painted portion 8 from being sprayed, and between the first masking plate and the object 1 to be painted, the edge 9 of the first masking plate 5 and the painting boundary line 10 are arranged. A second masking plate 6 is placed at a position slightly recessed from the partition surface 11 connecting the
the second masking plate 6 so that the edge 12 of the
are placed.

This masking member 4 is held by a movable frame 13 that is provided so as to be able to move toward and away from the object 1 to be coated by a drive means (not shown).

Further, the coating gun 7 is provided so as to be movable in parallel along the coating boundary line 10 of the object to be coated 1 by a traveling means (not shown).

14 is a support member for each of the masking plates 5 and 6; 15 is a mounting bolt; 16 is a pivot bolt for the support member 14; and 17 is an adjustment bolt for adjusting the attachment angle of the support member 14 to the movable frame 13.

In the above structure, after the masking member 4 is positioned at a predetermined position (the position where the center hole of the coating gun 7, the first masking plate edge 9, and the coating boundary line 10 are aligned on the same straight line) by the driving means, the coating is applied. 3 is the spray angle θ of the painting gun 7
At the same time, the coating gun 7 is moved in the length direction of the object 1 at a speed suitable for forming the set thickness of the coating film.

The sprayed paint 3 adheres to the bottom 2 of the object to be coated at a spray angle θ2, and the paint 3 within the spray angle θ1 blocked by the first masking plate 5 is deposited on the edge 9 of the first masking plate.

If this deposited paint 3 forms drops and scatters,
Since the second masking plate 6 reliably captures the spread of paint droplets, overspray to the non-painted portion 8 can be completely prevented.

In other words, since the spray pressure of the paint gun 7 does not act on the second masking plate 6, the paint splashes adhering to the edge 12 of the second masking plate 6 will not spread and adhere to the non-painted area 8, thereby ensuring that can prevent overspray.

Next, as an experimental example, 30
The first masking plate is placed 20 mm away from the first masking plate and 2 m from the partition surface between the first masking plate and the test piece.
Painting according to the method of the present invention in which a second masking plate is placed in a recessed position and vinyl chloride paint is sprayed to a thickness of about 500 μm from a position 300 mm away from the side sill, and a 10 mm distance from the side sill. The only masking plate was placed in a separate position, and vinyl chloride paint was sprayed in the same manner as in the method of the present invention, and then polyester paint was sprayed on top of it to a thickness of about 20μ. compared.

As a result, with the method of the present invention, fine paint droplets were spread and adhered to non-painted areas, but when polyester paint was sprayed on top of them as in the conventional method, they were completely hidden. So no problem.

On the other hand, in the case of the conventional method, the paint splashes were not hidden even when polyester paint was sprayed, and protrusions caused by the paint splashes were seen in the unpainted areas, confirming the effectiveness of the method of the present invention.

Incidentally, the spray coating according to the method of the present invention can be widely applied to other parts of structures to be coated instead of the side sills of this example.

With the above configuration, the present invention allows the first masking plate to clearly form a paint boundary line, and the second masking plate to reliably catch paint splashes to prevent staining of non-painted areas. Since masking paper is no longer required after repeated use, it has the excellent effect of significantly reducing labor and materials for painting work and significantly improving productivity.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the method of the present invention; FIG. 1 is a longitudinal sectional view showing a method of spray painting an object to be coated using a masking member, and FIG. 2 is a longitudinal sectional view illustrating a conventional example of the spray coating method. It is. 1...Object to be painted, 3...Paint, 5...
...First masking plate, 6...Second
Masking plate, 7...Painting gun, 8...
... Non-painted part, 9 ... Edge of first masking plate, 10 ... Painting boundary line, 11 ...
...Partition surface, 12...Edge of second masking plate.

Claims (1)

[Claims] 1 Mask part of the object to be painted and spray the paint,
In the partial painting method, a first masking plate is placed close to the front of the object to be painted, and the first masking plate that blocks the paint from the painting gun from being sprayed onto the non-painted area is connected to the first masking plate and the object to be painted. A second masking plate is placed at a position slightly recessed from the partition surface connecting the edge of the first masking plate and the painting boundary line of the object to be painted, and the paint adhering to the first masking plate is blown away. A spray painting method characterized in that a second masking plate blocks adhesion of the paint to non-painted areas.