KR100212808B1 - Method for painting body of car with auto-painting machine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle production technology for painting a vehicle body, and to a vehicle painting method using an automatic paint machine that can reduce painting costs by providing an appropriate painting cycle according to the viscosity and conductivity of the paint.

The present invention comprises the first step of separating the cleaning process, pre-painting process, paint process according to the painting process when the painting starts; A second step of dividing the cycle according to the length of the path through which the paint flows in the cleaning process; A third step of dividing the cycle according to the viscosity of the paint in the washing process; A fourth step of classifying and treating cycles according to electrical characteristics of the paint in a washing process; A fifth step of dividing the cycle according to the length of the path through which the paint flows in the prepaint process; A sixth step of treating the cycles according to the viscosity of the paint in the prepaint process; A seventh step of separating and treating cycles according to electrical characteristics of the paint in the prepaint process; And an eighth step of painting in the paint process.

Therefore, the present invention can reduce the cost of the coating process by reducing the generation of waste paint by setting the coating cycle in consideration of the path length, as well as the viscosity of the paint, the electrical characteristics of the paint, etc. There is an effect to improve the operation rate by minimizing the high voltage error that occurs frequently.

Description

Method for painting body of car with auto-painting machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile production technology for painting a vehicle body, and more particularly, to an automobile painting method using an automatic paint machine that can reduce painting costs by providing an appropriate painting cycle according to the viscosity and conductivity of paint. .

In general, painting refers to an operation for forming a coating film using paint for the purpose of covering the surface of an object for protection, aesthetics, marking, etc. of the object. In particular, since most of the main materials constituting the vehicle are made of steel, painting plays a very important role in the process of producing automobiles.

And most of the painting work is automatically performed by an automatic paint machine, the painting requires paint as a material. Paint refers to a liquid or solid material made of resins, pigments, additives, solvents, etc. for the purpose of covering the surface of the object, the components of the paint is divided into a film forming element and a film forming element. It is a solvent used to dilute to a viscosity suitable for painting exciting paints.

However, since the viscosity is different and the electrical properties are different according to the paint, it is preferable to set an appropriate coating cycle according to the paint. Conventionally, the coating cycle is set uniformly without considering the characteristics of the paint, so that the paint cost is high. There was a problem to be increased. In other words, when the paint is applied through a color charge valve (CCV) to which a plurality of collars are connected, the coating distance per second varies depending on the viscosity. Through the waste paint is generated a lot, the high voltage error during the cleaning process occurs in proportion to the length of the paint occupied in the return line has a high frequency error in the metallic color (metallic color) is a problem that occurs frequently.

Accordingly, the present invention provides an automobile coating method using an automatic coating machine that can reduce the painting cost and reduce high voltage errors by reducing the paint by variously setting the coating cycle according to the characteristics of the paint to solve the above problems. Its purpose is to.

In order to achieve the above object, the method of the present invention, in the automatic coating system to paint the car located in the booth by the side machine and the roof machine in a color designated by a specific color number of a plurality of color numbers, the painting is If it is started according to the painting process, the step of dividing the cleaning process, pre-paint process, paint process; Treating and dividing the cycles according to the length of the path through which the paint flows in the cleaning process; Treating the cycles according to the viscosity of the paint in the washing process; Dividing and treating cycles according to electrical characteristics of paints in a washing process; Dividing the cycle according to the length of the path through which the paint flows in the prepaint process; Treating the cycles according to the viscosity of the paint in the prepaint process; Dividing the cycle according to the electrical characteristics of the paint in the prepaint process; And painting in a paint process.

1 is a layout view of an automatic coating machine for performing a painting process in a vehicle manufacturing process,

2 is a connection diagram for connecting between the charge valve (CCV) and the atomizer in the automatic sprayer,

3 is a block diagram of an automatic coating control system to which the present invention is applied;

4 is a flowchart illustrating an automatic coating method according to the present invention.

* Explanation of symbols for main parts of the drawings

112,116,122,330: Color Charge Valve (CCV) 116,124,126,128,340: Atomizer

202,212,360: Bypass valve 204,214,350: Dosing pump

206,216: Waste paint container 310: PC

320: PLC

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a layout view of an automatic paint machine for performing a painting process in a vehicle manufacturing process.

Referring to FIG. 1, the automatic spraying machine is divided into a side machine for working on the side of a booth where painting work is performed, and a roof machine for working on the ceiling of the booth.

As shown in (a) of FIG. 1, the side machine is connected to a first color charge valve (hereinafter referred to as CCV) 112 to which a hose for supplying paints of color numbers 1 to 10 is connected. In addition, the second color charge valve (CCV) 114 is selected from the first CCV 112, the paint is discharged by pneumatic after being coupled with the thinner is connected to the hose and the hose of color number 11 to color number 20 It is connected. And the paint output from the second CCV 114 is connected to the atomizer 116 through the hose, so that the side machine is a paint of the corresponding color designated by the color number 1 to color number 20 on the side of the booth Paint the body of the car. Since two CCVs are used as described above, the lengths of the paths through which the paints of color numbers 1 to 10 flow and the lengths of the paths through the paints of color numbers 11 to 20 are different from each other. Do it differently.

As shown in (b) of FIG. 1, the loop machine is connected to one CCV 122 with a hose for introducing paints of color numbers 1 to 20, and three outlets of the CCV 122 are connected to the hose. It is connected to each of the three atomizers (124, 126, 128) through and is arranged to paint the vehicle body of the car on the upper side of the booth.

2 is a connection diagram showing the connection between the color charge valve and the atomizer in the automatic sprayer.

As shown in (a) of FIG. 2, the side machine is connected to the first CCV 112, hoses for introducing paints of air, color number 1 to color number 10, respectively, and the first CCV 112. Is connected to the line RL of the second CCV 114 via a hose. The second CCV 114 is connected to a hose for introducing thinner, air, and paints of color numbers 11 to 20, and the outlet of the second CCV 114 is dosed with the bypass valve 202 through the hose. The pump 204 is connected to which the atomizer 116 is connected. At this time, the bypass valve 202 and the dosing pump 204 is connected in parallel so that the paint flows through the bypass valve or the dosing pump, waste paint, through the return line (RT) of the atomizer, The waste thinner is connected to flow into the waste paint container 206.

As shown in (b) of FIG. 2, the loop machine is connected to one CCV 122 by a hose for flowing paint, air, and color number 1 to color number 20, and dosing at three outlets. The pump 214 and the bypass valve 212 are connected to each of the three atomizers 124, 126, and 128 so that the output of the CCV flows through the return lines RT of each atomizer. It is connected to flow to the waste paint container (216). The bypass valve 212 and the dosing pump 214 are connected in parallel so that the paint flows through the bypass valve 212 or the dosing pump 214.

On the other hand, in the embodiment of the present invention, color number 1 to color number 20 are assigned paints as shown in Table 1, and the characteristics of each paint are also shown in the table.

Color No. color Viscosity (20 ° C) Paint system Electrical resistance Progress per second during prepainting One 73L 14SEC 2C1B SOLID 2 SPARE 3 SPARE 4 42 U 15.5 SEC MICA 5 92U 15SEC METALLIC 0.33 Mohm 40 cm (5.3 bar) 6 24U 14SEC MICA 7 28 U 15.5 SEC MICA 1.88 Mohm 8 45 U 14SEC MICA 102 cm 9 SPARE 10 SPARE 11 74U 14SEC MICA 12 81U 14SEC MICA, METALLIC 93 cm 13 62 U 16SEC MICA, METALLIC 0.5 Mohm 70 cm 14 66 U 14SEC MICA 0.31 Mohm 15 11U 19SEC 2C1B SOLID 37 cm 16 SPARE 17 SPARE 18 SPARE 19 SPARE 20 SPARE

Referring to Table 1, the color number 1 of the automatic coating machine is 73L, the viscosity characteristic is 14SEC at 20 ° C and the paint system is 2C1B SOLID. The color number 2, the color number 3, the color number 9, the color number 10, and the color numbers 16 to 20 are spares which have not been used yet. Color number 4 is 42U, viscosity is 15.5 SEC and paint system is MICA. Color number 5 is 92U, viscosity characteristic is 15SEC, paint system is metallic (METALLIC), electrical resistance is about 0.33 Mohm, and the progress distance per second during prepainting is 40cmm. Color number 8 is 45U, viscosity characteristic is 14 SEC, paint system is MICA, traveling distance 102cm per second for prepainting, color number 13 is 62U, viscosity property is 16 SEC, paint system is MICA, running distance 70cm per second for prepaint Color number 15 is 11U, viscosity characteristic is 19 SEC, paint system is 2C1B SOLID, progress distance per second when painting is 37cm.

The automatic coating system which is arranged in this way and can paint the vehicle body of the vehicle with the paint of the color number 1 to the color number 20 is programmed and controlled by the control system as shown in FIG. 3 and is determined according to the flowchart shown in FIG. 4. Perform a cycle.

In general, a process for painting the exterior of a vehicle body in an automatic production system of an automobile is divided into a purge process, a prepaint process, and a paint cycle process. The cleaning process is the process of cleaning the paint hose to prevent discoloration when the color is different when painting the body. The prepaint process is the process of charging the paint hose with the color of the body to be coated after cleaning.The paint process is the prepaint process Is the process of painting the car body with paint filled in.

In addition, the coating cycle performed by the side machine and the loop machine in the washing process and the prepaint process are conventionally made of two cycles, but in the present invention, four cycles, as shown in Table 2 below.

division Cleaning process Prepaint process Cycle 1 Cycle 2 Cycle 3 Cycle 4 Cycle 1 Cycle 2 Cycle 3 Cycle 4 Side machine Post improvement 15 10.2 15 11 3.6 3 3.6 4.2 Time before improvement 15 10.2 4.8 6 Time 22 ← ← ← 10.7 ← ← ← Loop machine Post improvement 12.2 12.2 12.2 4.6 4.6 4.6 5.8 Time before improvement 12.2 12.2 5.8 8.4 Time 14 ← ← ← 8.4 ← ← ←

Referring to Table 2, conventionally, the side machine and the loop machine are divided into two cycles in the washing process, and the side machine and the loop machine are divided into two cycles in the prepaint process. And these two cycles are applied separately according to the supply path of the paint, for example, color number 1 to color number 10 was treated as cycle 1, color number 11 to color number 20 was treated as cycle 2. That is, in the case of the side machine in the conventional cleaning process, the color numbers 1 to 10 having a relatively long supply path were turned on for 15 sec, and the color numbers 11 to 20 having a relatively short supply path were turned on for 10.2 sec. In the case of the machine, the feeding paths of the color numbers 1 to 20 were the same, and thus were turned on for 12.2 sec in the same cycles 1 and 2.

In case of the side machine in the prepainting process, color numbers 1 to 10 with a long supply path were turned on for 4.8 sec, and color numbers 11 to 20 with a short supply path were turned on for 6 sec. It was on for 5.8 sec in Cycle 1 and 8.4 sec in Cycle 2.

As such, in the related art, since only the supply path is considered regardless of the characteristics of the paint and the cycle is simply divided into two, the paint may be wasted in the prepaint process according to the characteristics of the paint.

In the present invention, however, the paint is prevented from being unnecessarily wasted by applying four cycles in consideration of the length of the supply path and the characteristics of the paint in the cleaning process and the prepaint process.

That is, in the cleaning process according to the present invention, the cycles 1 and 2 are allocated the same time as the conventional cycles 1 and 2, but cycle 3 is 15 seconds on for the side machine, and cycle 4 is 11 seconds for the side machine. On, 12.2 seconds on for loop machines. In the prepaint process according to the present invention, Cycle 1 is 3.6 seconds for the side machine, 4.6 seconds for the loop machine, Cycle 2 is 3 seconds for the side machine, 4.6 seconds for the loop machine, and Cycle 3 is the side machine. 3.6 seconds for the loop machine, 4.6 seconds for the loop machine, 4.2 seconds for the side machine, and 5.8 seconds for the loop machine.

Figure 3 is a block diagram of an automatic coating control system to which the present invention is applied, Figure 4 is a flow chart showing an automatic coating method according to the present invention.

The control system of the automatic sprayer for setting the paint cycle according to the present invention, as shown in Figure 3, adjust the paint supply on / off time, adjust the on / off time of the bypass valve, return valve, A personal computer (PC) 310 for valve on / off and parameter change, and a programmable logic controller that drives each valve on / off control and dosing pump of the CCV and atomizer with data downloaded from the PC 310 ( PLC: 320, a color charge valve (CCV: 330), the atomizer valve 340, and the dosing pump 350.

According to the present invention, a method of performing a paint shop in four cycles by separating a high viscosity color metal collar and a high voltage error is divided into a cleaning process, a prepaint process, and a paint process, as shown in FIG. 4. The cleaning process is performed by dividing the cycle 1 and the cycle 2 according to the length of the paint supply path, the cycle 3 is performed on the metallic paint, and the cycle 4 is performed on the paint of high viscosity.

That is, in the embodiment of the present invention, when the color number 1 to the color number 20 is the same as Table 1, the color number 1 to the color number 10 except for the color number 5, which is a metallic color paint, perform cycle 1 shown in Table 2 above. Color number 11 to color number 20, except for color number 15, which is a highly viscous paint, perform cycle 2, color number 5 performs cycle 3, and color number 15 performs cycle 4. As described above, in the present invention, a separate paint cycle program is possible for each color by performing a separate cycle by separating the metallic color and the high viscosity color.

3 and 4, the cleaning process by programming the parameters such as paint supply valve, dosing pump, bypass valve, main needle, intermediate paint supply valve, discharge amount, bell RPM, etc. on the PC 310 in accordance with the present invention In the prepaint process, paint is charged from 10 to 12 cm from the return hose connected to the atomizer to prevent discoloration when painting the body and minimize high voltage error. do.

Referring to FIG. 4, in step 410, it is determined whether the process is a cleaning process. If the cleaning process is performed, cycle 1 is performed in step 412 if the length is relatively long according to the path length from step 411 to the paint and the atomizer. Perform cycle 2 at 413. In step 414, if it is determined that the metallic paint is metallic paint, cycle 3 is performed in step 415, and in step 416, if it is determined that high viscosity paint is performed, cycle 4 is performed in step 417.

In step 420, it is determined whether the process is a prepaint process. If the prepaint process is performed, the cycle 1 is performed in step 422 if the length is relatively long according to the path length from step 421 to the paint and the atomizer. Do 2. In step 424, if it is determined that the metallic paint is metallic paint, cycle 3 is performed in step 425. In step 426, if it is determined that high viscosity paint is performed, cycle 4 is performed in step 427.

In step 430, it is determined whether the paint process is performed, and in step 431, the painting operation is performed.

As described above, according to the present invention, the coating cycle is set in consideration of not only the path length until the paint reaches the atomizer but also the viscosity of the paint and the electrical characteristics of the paint according to the present invention. It can reduce the cost of the painting process by suppressing the occurrence, and it is possible to improve the operation rate by minimizing the high voltage error frequently occurring in the metallic color.

Claims (1)

In the automatic coating system to paint the body located in the booth by the side machine and the roof machine in a color designated as a specific color number among a plurality of color numbers, A first step of dividing the coating process into a washing process, a prepaint process, and a paint process according to a painting process; A second step of dividing the cycle according to the length of the path through which the paint flows in the cleaning process; A third step of dividing the cycle according to the viscosity of the paint in the washing process; A fourth step of classifying and treating cycles according to electrical characteristics of the paint in a washing process; A fifth step of dividing the cycle according to the length of the path through which the paint flows in the prepaint process; A sixth step of treating the cycles according to the viscosity of the paint in the prepaint process; A seventh step of separating and treating cycles according to electrical characteristics of the paint in the prepaint process; And Body painting method by an automatic spraying machine comprising an eighth step of painting in the paint process.

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