JPS58101761A - Changing over and supplying method for paint in painting line - Google Patents

Abstract

PURPOSE:To change over paints with a common spraying gun by supplying resins of the ratio corresponding to color selection signals into the 1st paint supplied from a color changer to the painting gun to prepare the 2nd paint differing in resin ratio from the 1st paint and supplying the same to the painting gun. CONSTITUTION:Paints are supplied through pipings 8a-d and paint regulators 9a-d to a color changer 10 from respective supply tanks wherein pigments, resins and curing agents are compounded and mixed at prescribed ratios for each color. The changer 10 receives the color selecting command signal (a) from a computer and supplies the 1st paint assigned by the same through a supply pipe 12 to a painting gun. When the changer receives a color selecting signal (b) from the computer, the changer drives a motor 16 to supply a prescribed amt. of the resin through a supply pipe 13 into a mixer 14 provided in the midway of said pipe 12, to prepare the 2nd paint differing in the resin ratio from the 1st paint. Said paint is supplied to a painting gun 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for selectively switching and supplying several types of paint based on a color selection command, such as on a painting line of an automobile podium, so that articles to be painted can be individually painted using a common painting gun. This is related to the painting line.

For example, the so-called three-coat method is commonly used on the above-mentioned car pode painting line, which first performs rust prevention by dipping, then performs intermediate coating, and finally applies top coating. , by a paint switching supply mechanism called a color changer.
A painting method has been adopted in which paint of a corresponding color is selected and supplied to a common painting gun based on a color selection command signal from a computer, thereby painting each car body individually by color.

By the way, when painting high-end models, it is necessary to apply one additional top coat in addition to the above three coats to improve the texture and weather resistance of the paint. Another top-coating station is installed on the extension of the painting line, and when high-end models are brought in, this top-coating station applies a top coat using a finishing paint with a high proportion of resin. Was.

However, in that case, a separate topcoating station is required, and a paint supply piping system, color changer,
A painting gun or the like must be provided, which not only increases equipment costs, but also requires separate installation space.

The present invention has been made in view of such problems, and includes:
At one painting station, the first painting gun has the same color but a different resin component ratio. It is an object of the present invention to provide a paint switching supply method in a painting line, in which a second paint can be selectively supplied as needed, and therefore two top coats as described above can be performed at the same station. .

That is, in the present invention, as described above, the first paint and the second paint used for two top coats differ only in the resin component ratio, and the second paint has a resin added to the first paint. This method was developed based on the fact that different colors require different amounts of resin to be added. The basic idea is to supply resin components as needed in the optimal ratio for that color, and by uniformly mixing them to produce a second paint with a high resin ratio, which is then supplied to the painting gun. It is a characteristic feature.

Hereinafter, the present invention will be described in more detail based on illustrated embodiments.

As shown in FIG. 1, the top coating station 1 of an automobile body painting line is shown.

In the case of normal 3 coats, the conveyor 2 transports from the intermediate coating station to the top coating station 1, where it is polished in a water polishing device 3, dried in an oven 4, and then top coated with a paint gun 6 in a top coating booth 5. After being dried in oven 7, it is transported to the next process.

The paint used for this first topcoat (hereinafter referred to as the first paint) is supplied to each supply tank (not shown) in which pigment, resin, and curing agent are blended and mixed in a predetermined ratio for each color.
From, supply piping 8a,...

8d, each paint regulator 9''*・
..., 9d to the color changer 10.

In response to a color selection command signal 3 applied from a computer (not shown) controlling the manufacturing line.

If the color specified this time is different from the previous color, the first paint of the previous time is washed by the tank supplied from the cleaning tank supply pipe 11, and then the first paint of the color specified this time is transferred to the supply pipe 12. Painting gun through 6
The paint is fed at a predetermined timing and the necessary color painting is performed.

In the present invention, the above-mentioned air paint supply pipe 8a,...
.

8d, a resin supply pipe 13 for supplying only the resin to be added to the paint is installed in parallel, and a two-liquid warming machine 14 is interposed in the middle of the supply pipe 12, and the resin supply pipe 13
12. It is connected to a two-liquid warming machine 14 through a connecting pipe 15, and a feeding gear pump 17 driven by a motor 16 is interposed in this connecting pipe 15. Supplying the resin to the liquid warming machine 14, mixing the resin into the first paint in the two-liquid warming machine 14,
A resin supply system is provided to produce a second paint having a high resin component ratio.

The motor 16 that drives the gear pump 17 is controlled by a control circuit 19 which receives at least two of the color selection command signal 1 and the model signal as input signals. Determine whether it is necessary to apply a topcoat (4 coats) or not (3 coats).

If it is a 4-coat model, color selection command signal 1
The first supplied by the color changer lO
Knowing the color of the paint, the drive (time, speed) of the motor 16 is controlled so as to supply the amount of resin added in accordance with the color.

The amount of this resin added varies depending on the color, but when the ratio of pigment to resin in the first paint is in the range of 171.2 to 1/10, the ratio of the second paint is in the range of 173 to 1/20. Set the optimal value so that it is within the range of .

By configuring the second paint supply system as described above, the second top coat can be performed by the same station 1.

For this reason, as shown in FIG.
A return conveyor 20 is provided to return the automobile body from the carry-in side to the carry-in side, and the return conveyor 20 causes the body to pass through the top coating station l again, thereby performing the second top coating.

In addition, when performing the second top coat, an empty space is secured in advance by a computer command so that the returned car pod can fill in.

When the car pode is again transported to the topcoating booth 5, the motor 16 is started by the control circuit 19,
The first paint sent from the color changer 10 is changed to the second paint in the two-liquid warming machine 14, and then the paint gun 6
What is necessary is to perform a second coating using the following method. These controls can be easily performed by a computer.

In the above embodiments, the present invention was applied to the second top coating of an automobile body, but the present invention is not limited to this. Needless to say, the present invention can also be applied to cases where it is necessary to change the resin ratio during the first top coat.

As is clear from the above description, according to one aspect of the present invention, when painting different colors on the same painting line, the second paint having a different resin ratio from the first paint can be switched and supplied as necessary. Moreover, this switching supply method eliminates the need to install another coating station in parallel or separately (thereby providing the advantage of being able to perform coating with the second paint in the same stage at a low cost and easily.

[Brief explanation of drawings]

The drawing is a schematic overall explanatory diagram of a coating station to which the method of the present invention is applied. 1...Top coating station% -2...Conveyor. 6... Painting gun, 8a,..., B b-... First paint supply pipe. 10--Color changer, 13--Resin supply pipe, 14--Two-liquid warming machine, 16--Motor. 17...Gear pump, 19...Motor control circuit. Patent Applicant: Toyo Kogyo Co., Ltd. Agent: Patent Attorney: Qingbai, Bo, and 2 others Procedural Amendment Form C) April 3, 1981 1 Display of the Case 1981 Patent Application No. 201794 2 Name of the Invention Painting Line Paint switching supply method in
Contents of the Amendment In the 4th line of page 1, the phrase "2. Claimed method" will be corrected to "2. Scope of claims."that's all

Claims (1)

[Claims] (1) A first supplying a plurality of first paints each containing a mixture of pigments, resins, and curing agents corresponding to each color in a predetermined ratio.
In a painting line that includes at least a paint supply line, a color changer that selectively switches a first paint corresponding to a color selection signal, and a painting gun that paints with the first paint selected by the color changer, the color During the first paint supplied from the changer to the painting gun.Resin is supplied at a ratio corresponding to the color selection signal, and the first paint and resin are mixed to create a second paint whose ratio of resin is different from that of the first paint. A paint switching supply method in a painting line, characterized in that a paint is generated and the second paint is supplied to a painting gun.