JPH01281167A - Masking jig for coating and coating method - Google Patents

Abstract

PURPOSE:To achieve a good finishing having a clear masking line by preventing the entering of coating material due to the of the stream of coating material from the gap between a masking jig and a body of a car or at the end of masking jig even in application of coating material of high viscosity at a high spraying speed. CONSTITUTION:The arrangement ia such that a magnet member 3 is provided on a front surface 2a, with its rear surface 2b provided with an upstanding wall 4, the rear surface 2b and a front surface 4a of upstanding wall 4 being connected by a curved surface 4b, an end portion 4c of the front surface 4a being curved so as to be directed toward a masking line L. A masking jig 1 with such construction is attached to a body 12 of a car along the masking line L and coating material is sprayed to a surface to be coated, while air is blown toward the masking jig 1 from the rear side 4a of the upstanding wall 4 to be drawn from the side of the front surface 4a. As a result, even in op[plying highly viscous coating material at high spraying speed, the entering of coating material due to the of stream of coating material from the gap between the masking jig and the body or at the end of the jig can be prevented, resulting in a coated surface having a good finishing with clear masking line.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a masking jig and a coating method suitable for two-tone coating.

(Conventional technology) When painting different colors of paint, such as two-tone paint,
The technique of applying masking paper to the non-painted side is well known. However, it takes a lot of effort to attach and remove paper, and paper consumption is large. In order to solve these inconveniences, techniques shown in, for example, Japanese Patent Laid-Open No. 56-166969 and Japanese Patent Laid-Open No. 58-58168 have been proposed.

JP-A-56-166969 discloses that a first masking plate is interposed between the coating gun and the object to be coated, and this first masking plate is
A method of coating by providing a second masking plate on the side of the object to be coated of the masking plate will be described.

A painting parting line is clearly formed by the first masking plate, and the first masking plate is formed by the second masking plate.
It acts to capture paint splashes that have gone around to the back of the masking plate.

JP-A-58-58168 relates to a painting robot in which a masking device is attached to a robot arm, and the masking device is composed of a masking plate and a support rod that rotatably supports the masking plate.

(Problems to be Solved by the Invention) In recent years, as part of pollution prevention efforts, the use of high-performance paints and water-soluble metallic paints that are solvent-free or contain only a very small amount of solvent has been increasing.

Such a paint has a high viscosity and is difficult to atomize, so it is necessary to increase the spray pressure of the gun, and the scattering speed of paint particles increases.

As a result, the second masking plate of JP-A-56-166969 is insufficient to block paint splashes, and the second masking plate is
It invades the gap between the masking plate and the object to be painted,
Make the parting line unclear.

Furthermore, the masking plate disclosed in JP-A-58-58168 cannot prevent the gap between the curved surface to be painted and the lower edge of the masking plate and the intrusion of paint splashes from above the masking plate, and the painted surface cannot be prevented. Getting worse.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes a magnetic material on the front surface, an upright wall on the back surface, and a curved surface connecting the back surface and the front surface of the upright wall. The front end of the wall is curved toward the parting line to form a masking jig for painting.

(Function) A masking jig having an upright wall that prevents paint from scattering to the non-painted surface is attached along the parting line of the car body, and air is blown from the back side of the upright wall toward the masking jig. Then spray the paint onto the painted surface while exhausting from the front side of the standing wall.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a plan view of a masking jig according to the present invention, and FIG. 2 is a sectional view thereof.

The masking jig 1 for painting includes a substantially strip-shaped abutting member 2 facing the surface to be painted, and a magnet material 3 attached to the front surface 2a of the abutting member 2 to adhere the abutting member 2 to the surface to be painted. and an upstanding wall 4 protruding from the back surface 2b of the abutment member 2.

The magnet material 3 is preferably a resin magnet plate made of plastic mixed with magnetic metal powder, for example, and is fixed to the front surface 2a with adhesive or screws.

The base of the front surface 4a of the upright wall 4 is connected to the back surface 2b with a smooth curved surface 4b, and the tip 4c of the front surface 4a of the upright wall 4 is curved forward.

In FIG. 2, reference numeral 5 denotes a diagonal member extending between the back surface 4d of the upright wall 4 and the back surface 2b of the abutting member 2, which serves as a strength member for the upright wall 4 and as a guide for air flow, which will be described later. to do.

The painting masking jig 1 formed into a hollow triangular prism by the abutting member 2, the upright wall 4, and the diagonal member 5 can be mass-produced at low cost and can be shaped freely if it is made of, for example, an integrally molded polycarbonate product. You can choose.

3 and 4 are a side view and a sectional view of a painting booth suitable for using the masking jig 1 for painting.

The inside of the paint booth 10 is placed on the conveyor 11 and the car body 12 is
moves horizontally, and paint guns 1 are installed on both sides of the vehicle body 12.
A robot 14°14 with 3.13 is located.

A ceiling filter 15 is arranged on the ceiling of the painting booth 10 to allow air to flow out downwardly.
A floor slat 16 is arranged on the floor of the vehicle, which sucks in the outflowing air and allows the paint particles to pass through.

Air jet ducts 17.17 are suspended above both sides of the vehicle body 12, and the air jet ducts 17.17 are suspended from the ceiling filter 15 to blow out air at a higher speed than the air flowing down from the ceiling filter 15. There is an air suction duct 18
．． 18 are provided.

The operation of the painting masking jig 1 and the painting booth 10 having the above configuration will be described below.

First, as shown in FIG. 5, the painting masking jig 1 is placed along the parting line of the vehicle body 12 with the front surface 4a of the upright wall 4 facing downward. The masking jig 1 is secured to the vehicle body 12 by the action of the magnet material 3.

While sending air downward from the ceiling filter 15 of the painting booth 10 and sending air more strongly from the air jet duct 17,
High viscosity paint is sprayed from the paint gun 13.13.

When the paint is applied deeply to the masking jig 1, the paint advances toward the parting line on the curved surface 4b of the upright wall 4, as shown in FIG. 5(a)k. A part of this inverts along the curved surface 4b and scatters in a direction away from the vehicle body 12, but is pushed back toward the coating gun 13 by the air flow discharged from the air jet duct 17.

In addition, when the paint is applied to the masking jig 1 shallowly, as shown in FIG.
It is deflected to the third side, and further pushed back to the painting gun 13 side by the air flow ejected from the air ejection duct 17.

The masking jig 1 may be a plastic injection or extrusion molded product, a light metal sheet metal bent product, etc., as long as it includes the abutting member 2 and the upright wall 4.

(Effects of the Invention) According to the present invention, even when painting with paint with high viscosity and high injection speed, paint can be removed due to the gap between the masking jig and the vehicle body and from the tip of the masking jig. It prevents intrusion and makes the parting line clear, allowing you to obtain a good finished painted surface.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the masking jig according to the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a side view of the coating booth, Fig. 4 is a sectional view thereof, and Figs. b) is an action diagram. In addition, in the drawing, 1 is a masking jig for painting, 2 is a contact member, 2a is the same front side, 2b is the same back side, 3 is a magnet material, 4
is a standing wall, 4a is the same front surface, 4b is a curved surface, 4c is a tip,
4d is the back side of the standing wall, 12 is the vehicle body, and L is the parting line. Section 5 (b) (a)

Claims (2)

[Claims] (1) A magnetic material is provided on the front surface, a standing wall is provided on the back surface, the back surface and the front surface of the standing wall are connected by a curved surface, and the tip of the front surface of the standing wall is curved toward the parting line. A masking jig for painting featuring features. (2) A masking jig with a standing wall that prevents paint from scattering to the non-painted surface is attached along the parting line of the car body, and air is blown from the back side of the standing wall toward the masking jig. A painting method characterized by spraying paint onto the painted surface while applying heat and exhausting air from the front side of a standing wall.