JPH0929164A - Method for controlling coating pattern width of coating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly form a coating pattern of a coating agent on a work in a specified width irrespective of the change in the temp. and viscosity of the agent or the wear, etc., of the nozzle of a coating gun by injecting the agent from the gun. SOLUTION: When the temp. of a coating agent 5 is changed periodically or by more than specified, the width of the coating pattern of the coating agent 5 formed on a work W by a coating gun 2 is detected with an image pickup device 8, and the distance between the gun 2 and work W is set so that the detected width coincides with a target width. Thereafter, the work W is coated with the coating agent 5 by the gun 2 with the set distance until the distance is reset. The discharge of the agent 5 from the gun 2 is made costant at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for applying a high-viscosity coating agent such as PVC to a work with a predetermined coating pattern width by a coating gun.

[0002]

2. Description of the Related Art For example, a high-viscosity coating agent such as PVC (vinyl chloride resin) or a sealing agent is applied to the lower surface of the floor of an automobile body. It is performed by ejecting the coating agent from the provided coating gun toward the work. In this case, since the work such as the vehicle body floor has a large area, the application surface of the work is divided into a plurality of application sites, and the application agent is applied to these application sites sequentially.

When performing such a coating operation, in order to avoid excessive overcoating and uncoating of the coating agent, the coating pattern width of the coating agent sprayed from the coating gun on the work is a predetermined target pattern width. While it is important to control the viscosity of the coating composition, the coating agent is liable to change in viscosity due to temperature change and the like. Therefore, for example, even if the supply flow rate of the coating agent to the coating gun is constant, the ejection rate of the coating agent from the nozzle of the coating gun, the ejection pressure, and the like due to temperature changes and viscosity changes of the coating agent. It tends to change, and the width of the coating pattern tends to change.

Therefore, as a technique for controlling the coating pattern width of the coating agent in this way, in recent years, for example, JP-A-7-24
Those disclosed in Japanese Patent Application Laid-Open No. 386 and Japanese Patent Application Laid-Open No. 7-60172 have been proposed.

In Japanese Patent Application Laid-Open No. 7-24386,
The coating pattern width of the coating agent is detected by using the imaging device, and the supply flow rate of the coating agent to the coating gun is controlled so that the detected coating pattern width matches the target pattern width.

Further, in Japanese Patent Application Laid-Open No. 7-60172, the pressure and temperature of the coating agent supplied to the coating gun are detected by sensors, respectively, and the pressure and temperature are detected by a predetermined arithmetic expression. By adjusting the distance between the application gun and the work by the amount of movement,
The coating pattern width is made to match the target pattern width.

However, the techniques of these publications have the following disadvantages.

That is, in Japanese Patent Application Laid-Open No. 7-24386, since the flow rate of the coating agent supplied to the coating gun is controlled in order to match the coating pattern width with the target pattern width, it is coated on the work. The coating film thickness of the coating agent tends to be non-uniform. In this case, if the film thickness of the coating agent is excessively large, an extra coating agent is used, which is disadvantageous in terms of cost. Further, if the film thickness of the coating agent is excessively thin, the quality is deteriorated. Cause problems.

Further, in Japanese Patent Laid-Open No. 7-60172, the distance between the coating gun and the work is adjusted only in accordance with the pressure and temperature of the coating agent supplied to the coating gun. When the nozzle is worn, even if the pressure and temperature are controlled to be constant (at this time, the distance between the coating gun and the work is kept constant), the coating pattern width is the nozzle of the coating gun. Becomes narrower than in the case of normal, and it becomes impossible to match the coating pattern width with the target pattern width. Especially as a coating agent PVC
In general, when PVC is used, abrasion-promoting substances such as calcium carbonate are contained in the PVC, and the supply pressure of the coating agent to the coating gun becomes extremely high (maximum 100 to 100).
Since the pressure is 160 kg · f / cm ² , the nozzle is likely to be worn, and thus the above-mentioned inconvenience is likely to occur.

[0010]

SUMMARY OF THE INVENTION The present invention solves such inconveniences, and the coating agent is applied with a predetermined target pattern width regardless of the temperature change and the viscosity change of the coating agent or the wear of the nozzle of the coating gun. An object of the present invention is to provide a control method capable of uniformly applying the coating agent onto a work while being ejected from an application gun.

[0011]

In order to achieve such an object, the present invention preliminarily determines the coating pattern width of the coating agent sprayed toward the work from a coating gun arranged at a certain distance from the work. A method of controlling to a predetermined target pattern width, the pattern width detecting step of ejecting the coating agent from the coating gun at a substantially constant discharge flow rate, and detecting the coating pattern width of the coating agent at that time, The coating pattern width is compared with the target pattern width, and a distance setting step of setting the distance between the coating gun and the work for matching both pattern widths based on the deviation between the two pattern widths, and the set coating gun. And a coating step of spraying the coating agent having a substantially constant discharge flow rate toward the workpiece from the coating gun at a distance between the workpiece and the workpiece.

According to the present invention, the actual coating pattern width when the coating agent is ejected from the coating gun at a substantially constant discharge flow rate is detected, and the detected coating pattern width matches the target pattern width. Since the distance between the coating gun and the work is set as described above, the set distance is such that the coating pattern width matches the target pattern width in the current temperature state and viscosity state of the coating agent and the abrasion state of the nozzle of the coating gun. It is the distance between the application gun and the work that can be done. Therefore,
By setting the distance between the coating gun and the work as a set distance, and spraying the coating agent having the substantially constant discharge flow rate toward the work from the coating gun to target the actual coating pattern width for the work. It can match the pattern width. Further, since the flow rate of the coating material discharged from the coating gun is made substantially constant, the film thickness of the coating material coated on the work becomes uniform.

Therefore, according to the present invention, the coating agent is ejected from the coating gun with a predetermined target pattern width regardless of the temperature change and the viscosity change of the coating agent or the wear of the nozzle of the coating gun. The coating agent can be uniformly applied to the work.

In the present invention as described above, the pattern width detecting step and the distance setting step can be carried out each time the coating material is applied to the work, but the application which causes a variation in the application pattern width to the work. The temperature and viscosity of the agent, the wear state of the nozzle, and the like generally change little with time.

Therefore, in the present invention, the pattern width detecting step and the distance setting step are periodically performed at a predetermined timing, or the temperature of the coating agent in the coating step is performed prior to the coating step. In addition, it is newly performed when the temperature of the coating material in the previous pattern width detecting step changes by a predetermined amount or more.

By doing so, when the temperature or viscosity of the coating agent, or the wear state of the nozzle, which causes an inappropriate variation in the coating pattern width on the work, is changed,
It is possible to control the coating pattern width on the work to the target pattern width by making the distance between the coating gun and the work proper, and the temperature or viscosity of the coating agent or the wear state of the nozzle does not change, or When the change is small enough, the work coating process can be performed in mass production by controlling the coating pattern width on the work to the target pattern width simply by keeping the distance between the coating gun and the work constant. , Work efficiency can be improved.

Further, in the present invention, further, a narrowed portion capable of adjusting a passage area is provided in a passage for guiding the coating agent supplied to the coating gun to a nozzle of the coating gun, and the pattern width detecting step is performed. By supplying the coating agent at a substantially constant flow rate to the coating gun and adjusting the passage area of the throttle portion so that the pressure at the upstream portion of the throttle portion becomes a predetermined value, a substantially constant discharge from the coating gun. The coating agent is jetted at a flow rate, and the coating step is performed by supplying the coating agent at a substantially constant flow rate to the coating gun while maintaining the passage area of the throttle portion at the passage area adjusted in the pattern width detection step. The coating agent having a substantially constant discharge flow rate is jetted from the coating gun toward the work.

By providing the squeezing portion on the coating gun in this way, in the pattern width detecting step, the passage area of the squeezing portion is adjusted so that the pressure at the upstream portion of the squeezing portion becomes a predetermined value. The coating pattern width can be detected by ejecting the coating agent from the coating gun at a substantially constant discharge flow rate regardless of the temperature of the coating agent or the viscosity corresponding to the temperature. In, the coating pattern width that matches the target pattern width while ejecting the coating agent from the coating gun at a substantially constant discharge flow rate can be achieved simply by maintaining the channel area of the narrowed portion at the channel area adjusted in the pattern width detection step. The coating agent can be applied to the work with.

In this case, in the pattern width detecting step, the flow rate of the coating agent discharged by the coating gun is further detected using an appropriate flow rate sensor or the like, and the detected discharge flow rate is reduced to a predetermined value. By adjusting the passage area of the portion, the coating agent having a constant discharge flow rate may be ejected from the coating gun.

Further, in order to supply the coating agent to the coating gun at a substantially constant flow rate, for example, a metering pump may be used to supply the coating agent to the coating gun.

[0021]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS. 1 is a system configuration diagram of a coating apparatus according to the present embodiment, FIG. 2 is an explanatory diagram of a main part of the apparatus of FIG. 1, FIGS. 3 and 4 are flowcharts for explaining the operation of the apparatus of FIG. 1, FIG. 6 is a diagram for explaining the operation of the apparatus of FIG. 1, and FIG. 6 is an explanatory diagram for explaining the operation of the apparatus of FIG.

Referring to FIG. 1, reference numeral 1 is a robot apparatus having an application gun 2 attached to the tip of an arm, 3 is a robot controller for controlling the robot apparatus 4, and 4 is an application agent 5 on the application gun 2 (in this embodiment, For example, a metering pump that supplies PVC), 6 is a servomotor that drives the metering pump 4, 7 is a tank that stores the coating agent 5, 8 is a pattern width of the coating agent 5 ejected from the coating gun 2. Imaging device,
Reference numeral 9 is a system controller for setting the distance between the work W to which the coating agent 5 is applied and the coating gun 2. The metering pump 4 driven by the servomotor 6 sucks the coating material 5 in the tank 7 through a suction pipe 10 that connects the suction port and the tank 7. Then, the sucked coating material 5 is supplied from the supply pipe 11 led out from the discharge port of the metering pump 4, the circulation valve 12 and the flow rate sensor 13 fixed to the arm 1a of the robot apparatus 1, and the flow rate sensor 13 from the flow rate sensor 13. It is supplied to the coating gun 2 through the supplied supply pipe 14 in order. In this case, the supply flow rate of the coating agent 5 detected by the flow rate sensor 13 is given to the system controller 9, and the system controller 9 monitors the supply flow rate and applies the coating agent 5 at a predetermined flow rate to the coating gun 2
The servomotor 6 is controlled so as to be supplied to the. Also,
A part of the coating material 5 supplied from the metering pump 4 is recovered in the tank 7 via a recovery pipe 15 led out from the circulation valve 12.

In FIG. 1, Sa is a coating work station into which the work W to which the coating agent 5 is applied is carried in. During the coating work on the work W, the robot apparatus 1 is controlled by the robot controller 3. , Coating gun 2 according to the predetermined teaching data
Is moved along the coating surface of the workpiece W while being arranged opposite to the coating surface.

Further, Sb is a distance setting work station for performing a work for setting the distance between the coating gun 2 and the work W at the time of the coating work on the work W, and the distance setting work station Sb is provided with the image pickup device. The apparatus 8 is arranged, and the coating gun 2 is moved by the robot apparatus 1 at the timing described later. In this case, the imaging device 8
Is an image of the pattern of the coating agent 5 ejected from the coating gun 2 moved to the distance setting work station Sb at the same distance position as the distance from the coating gun 2 of the work W in the coating work station Sa, and the image data Is output to the system controller 9. Then, the system controller 9 detects the coating pattern width of the coating agent 5 based on the image data obtained by the imaging device 8.

Referring to FIG. 2, the applicator gun 2 includes a fixed base 16 fixed to the tip of the arm 1a of the robot apparatus 1 and a coating rail 5 on the fixed base 16 via a guide rail 17. The movable portion 17 is provided so as to be movable in the ejection direction. In this case, the movable portion 17 has a pinion gear 23 in which the rack 18 provided on the guide rail 17 is rotationally driven by the servomotor 19 fixedly mounted on the fixed base portion 16 in order through the speed reducer 20 and the bevel gears 21 and 22. And the pinion gear 23 rotates to move the coating agent 5 in the ejection direction. The servo motor 19 is controlled by the system controller 9.

The movable part 17 is provided with an inflow port 24 to which the supply pipe 14 (see FIG. 1) is connected, and the inflow port 24 is attached to the tip of the movable part 17 of the nozzle 2.
5, passages 26, 27, 2 formed inside the movable part 17
8 and 29 are connected in order.

A rod 30 for adjusting the passage area is movably inserted in the passage 27 in the longitudinal direction of the passage 27, and the portion of the rod 30 inserted in the passage 27 is tapered. Is formed in. As a result, the throttle portion 31 of the passage 27 is formed in the insertion portion of the rod 30, and the passage area of the throttle portion 31 is adjusted by moving the rod 30 in the longitudinal direction.

The rear end of the rod 30 is projected to the rear of the movable part 17, and a rack 32 is formed on the projected part. The rack 32 is meshed with a pinion gear 35 that is rotatably driven via a drive gear 34 by a servomotor 33 that is fixed to the rear part of the movable portion 17, and the rotation of the pinion gear 35 causes the rod 30 to move in the longitudinal direction. Moving. The servo motor 33 is controlled by the system controller 9.

At the location of the inflow port 24, a pressure sensor 36 and a temperature sensor 37 for detecting the pressure and temperature of the coating material 5 are provided on the upstream side of the throttle portion 31,
Each of these sensors 36 and 37 outputs the detected pressure and temperature to the system controller 9.

In FIG. 2, reference numeral 38 denotes a valve rod which is movable in the passage 29 toward the nozzle hole 25a of the nozzle 25 so that the valve rod 38 can move freely.
The nozzle 39 is driven forward and backward by a cylinder 39 provided therein, the forward drive thereof closes the nozzle hole 25a, and the backward drive opens the nozzle hole 25a.

Next, the operation of the coating apparatus will be described.

Referring to FIG. 3, in the coating apparatus of the present embodiment, the system controller 9 causes the robot controller to periodically perform a predetermined timing, such as at the start of operation or at predetermined time intervals after the start of operation. In accordance with the instruction given to the robot controller 3,
Control the coating gun 2 to set the distance setting work station S
It is moved to b (STEP 1). The target pattern width WT of the coating agent 5, the target supply amount QT of the coating agent 2 to the coating gun 2, and the target pressure PT of the coating agent 5 at the location of the pressure sensor 36 of the coating gun 2 are the system controller 9 (STEP 2), the system controller 9 further controls the metering pump 4 to the servomotor 6 so that the coating material 5 having the target supply amount QT is supplied to the coating gun 2.
The coating agent 5 is spouted from the coating gun 2 by controlling it through (STEP 3).

In this state, the system controller 9
The pressure detected by the pressure sensor 36 for the coating material 5 is the target pressure P.
The servo motor 33 moves the rod 30 so as to match T, and the passage area of the throttle portion 31 is adjusted (STEPs 4, 5, and 6).

By adjusting the pressure in this way, the discharge flow rate of the coating agent 5 ejected from the nozzle 25 of the coating gun 2 is maintained at a substantially constant value regardless of the temperature of the coating agent 5 or the like. .

That is, referring to FIG. 5, the relationship between the amount of movement of the rod 30 toward the forward side (the amount of movement in the direction of narrowing the passage area of the throttle portion 31) and the pressure at the pressure sensor 36 is shown in FIG. As shown in the figure, as the rod 30 is advanced to narrow the passage area of the narrowed portion 31, the pressure becomes higher, and as the temperature of the coating agent 5 becomes higher, the pressure becomes higher. descend. In this case, when the pressure detected by the pressure sensor 36 is controlled to the target pressure PT as described above, the moving amount of the rod 30 is such that the temperature of the coating material 5 is 22 ° C and 30 °.
In case of C and 36 ° C, X ₂₂ , X ₃₀ , X ₃₆ (X ₂₂
<X ₃₀ <X ₃₆ ).

On the other hand, referring to FIG. 6, this figure is a diagram showing the relationship between the amount of movement of the rod 30 to the forward side and the amount of discharge of the coating agent 5 ejected from the nozzle 25. As shown in (1), the discharge amount decreases as the rod 30 is advanced to narrow the passage area of the throttle portion 31, and the discharge amount increases as the temperature of the coating agent 5 increases. Then, as described above, when the temperature of the coating material 5 is 22 ° C., 30 ° C., and 36 ° C., the moving amounts X ₂₂ , X ₃₀ , and X _{36 of the} rod 30 at which the pressure becomes the target pressure PT are: As is clear from the drawing, the discharge amount is substantially constant regardless of the temperature of the coating material 5.
In this case, the discharge amount can be suppressed to about 2% at most. The discharge amount of the coating agent 5 controlled in this way is not affected by the abrasion of the nozzle 25 or the like.

When controlling the discharge amount of the coating agent 5 as described above, for example, the passages 26, 27,
28, 29, etc., a flow rate sensor (not shown) is provided in the vicinity of the nozzle 25, and after controlling the pressure of the coating agent 5 as described above, the detected flow rate by the flow rate sensor is a predetermined target discharge amount. The movement amount of the rod 30 may be adjusted so as to match with. By doing so, it becomes possible to control the discharge amount of the coating agent 5 to a constant discharge amount with higher accuracy.

Next, as described above, the movement amount of the rod 30 when the pressure at the location of the pressure sensor 36 is controlled to the target pressure PT is the rod 30 during the subsequent application to the work W.
Is determined as the moving amount XT (STEP 7). Since the moving amount of the rod 30 and the passage area of the narrowed portion 31 have a one-to-one correspondence, when the moving amount of the rod 30 is determined, the passage area of the narrowed portion 31 is also determined.

Further, the system controller 9 controls the pressure as described above, and based on the image data obtained from the image pickup device 8, the coating gun 2 is set at the currently set distance between the coating gun 2 and the work W. Detects the coating pattern width of the coating agent 5 ejected from (STEP 8),
The detected coating pattern width is compared with the target coating pattern width WT (STEP 9).

At this time, if the detected coating pattern width matches the target coating pattern width WT, the displacement amount of the movable portion 17 of the coating gun 2 remains unchanged and the displacement amount is used for the subsequent coating. Moving part 1 of coating gun 2 during work
7 is determined as the displacement amount ΔLT, that is, the current distance between the coating gun 2 and the work W is set as the distance between the coating gun 2 and the work W in the subsequent coating work (STE).
P10, 12).

When the detected coating pattern width does not match the target coating pattern width WT, the system controller 9 moves the coating gun 2 to match the coating pattern width with the target coating pattern width WT. The displacement amount of the portion 17 is obtained by a predetermined calculation, and the obtained displacement amount is the displacement amount Δ of the movable portion 17 of the coating gun 2 in the subsequent coating operation.
LT, in other words, the determined displacement Δ
Only LT is set as a distance added to the current distance between the coating gun 2 and the work W as the distance between the coating gun 2 and the work W in the subsequent coating work (STEPs 11 and 12).

Specifically, referring to FIG. 7, the current distance L between the coating gun 2 and the workpiece W is maintained at a substantially constant discharge amount of the coating agent 5 from the coating gun 2 as described above. Assuming that the coating pattern width W ₀ is smaller than the target pattern width WT, for example, the coating gun 2 is retracted from the work W by the displacement amount ΔLT in the spraying direction of the coating agent 5, and the distance between the coating gun 2 and the work is (L + ΔLT). By doing the work W
The coating pattern width on the coating surface of the target pattern width WT
The displacement amount .DELTA.LT corresponds to the deviation between the coating pattern width W and the target pattern width WT. Therefore, the system controller 9 uses the STE
Based on the deviation between the coating pattern width detected in P8 and the target coating pattern width WT, the displacement amount .DELTA.LT of the movable portion 17 of the coating gun 2 as described above is obtained. In this case, when the detected coating pattern width is larger than the target coating pattern width WT, the displacement amount .DELTA.LT of the movable portion 17 in the direction of advancing the coating gun 2 toward the work W is obtained.

As described above, the coating pattern width becomes smaller than the target pattern width WT when the wear of the nozzle 25 of the coating gun 2 progresses or when the temperature of the coating agent 5 decreases ( At this time, the viscosity of the coating material becomes high) and the like, and the temperature of the coating material 5 rises, the coating pattern width becomes larger than the target pattern width WT.

As described above, the distance between the coating gun 2 and the work W at the distance setting work station Sb is set.

In STEP 12, when the distance between the coating gun 2 and the work W is set as described above,
The temperature t of the coating material 5 detected by the temperature sensor 37
₀ (hereinafter referred to as distance setting temperature t ₀ ) is taken into the system controller 9.

Further, in the present embodiment, when the target coating pattern width is made to differ depending on the application site on the work W, the above-described work of setting the distance between the application gun 2 and the work W is different. The application is performed for each target application pattern width corresponding to the application site, and the application gun 2 is provided for each target application pattern width.
And the work W are set. Alternatively, the distance setting operation may be performed on a plurality of representative patterns, the result may be calculated, and the distances to other patterns may be set. In this case, the target supply amount QT of the coating agent 5 and the target pressure PT
Is determined corresponding to each target coating pattern width.

After the distance between the coating gun 2 and the work W is set in this manner, the coating work of the coating agent 5 on the work W at the coating work station Sa is performed as follows.

That is, referring to FIG. 4, first, under the control of the robot controller 3, the robot apparatus 1 moves the coating gun 2 to the coating work station Sa (ST.
EP13). Then, the target coating pattern width WT at the time of coating the work W and the target supply amount QT of the coating agent 5 to the coating gun 2 are taken into the system controller 9, and further, the rod of the coating gun 2 set as described above. The movement amount XT of 30, the target pressure PT, and the displacement amount Δ of the movable portion 17
LT and the distance setting temperature t ₀ are taken into the system controller 9 (STEPs 14 and 15).

Next, the system controller 9 controls the servomotor 19 to displace the movable portion 17 of the coating gun 2 by the displacement amount ΔLT (STEP 16). As a result, the distance between the coating gun 2 and the workpiece W is adjusted so that the target coating pattern width WT can be obtained. Also,
The rod 30 of the coating gun 2 is controlled by the servo motor 33 to the position of the set movement amount XT.

Thereafter, the system controller 9 controls the servomotor 6 in accordance with the target supply amount QT to supply the coating agent 5 from the metering pump 4 to the coating gun 2, and the robot controller 1 controls the robot apparatus 1 to cause the coating gun 5 to feed the coating agent 5. 2 is moved along the application surface of the work W,
As a result, the work of applying the coating material 5 to the work W is started (STEP 17).

In such a coating operation, the coating gun 2
Since the rod 30 is controlled to the position of the movement amount set as described above, basically, the pressure of the coating agent 5 at the position of the pressure sensor 36 becomes the target pressure PT, and therefore the coating gun. The amount of the coating material 5 ejected from the second nozzle 25 onto the work W is substantially constant.

Further, since the distance between the work W and the coating gun 2 is adjusted to the distance set as described above, the coating pattern width of the coating agent 5 applied to the work W is also the target pattern width WT. Match.

Therefore, the coating material 5 is applied to the work W with a predetermined target coating pattern width WT and a uniform film thickness.

In this embodiment, the pressure detected by the pressure sensor 36 during the coating operation is the target pressure P.
It is compared and confirmed with T (STEP 18), and if the detected pressure does not match the target pressure PT for some reason, the moving amount of the rod 30 of the coating gun 2 is adjusted in the next coating operation ( (STEP 19). In this case, in this embodiment, the system controller 9
Holds the data indicating the relationship between the movement amount of the rod 30 and the pressure and temperature of the coating agent 5 as shown in FIG. 5 by a map or the like, and at the time of the next coating operation, the temperature sensor 37 at that time is held. Based on the detected temperature and the target pressure PT, the moving amount of the rod 30 is calculated from the above map and the rod 30 is moved to the position of the calculated moving amount.

In this way, when the coating operation of this time is completed (STEP 20), the system controller 9 compares the current detected temperature of the coating agent 5 by the temperature sensor 37 with the distance setting temperature t ₀ (STEP 21). ), If the detected temperature differs from the distance setting temperature t ₀ by a predetermined amount or more, the above-mentioned distance setting operation is performed again (STE).
P22), otherwise, the next coating operation is performed (STEP 23).

Therefore, in the present embodiment, the coating agent 5
The temperature of the application gun changes relatively, and as described above, the application gun 2
Even if the discharge amount of the coating material 5 is substantially constant due to the temperature change or the viscosity change of the coating material 5 corresponding to the change in the coating pattern width, the distance setting operation is performed. As a result, the coating pattern width during the actual coating operation on the work W is the target coating pattern width W.
The distance between the coating gun 2 and the work W is adjusted so as to match T.

Further, in this embodiment, even if the temperature of the coating agent 5 does not change, the distance setting operation is performed at regular timings, such as when the coating apparatus starts operating, as described above. Even when the nozzle 25 of the gun 2 is worn and there is a risk that the coating pattern width will change, the coating pattern width during the actual coating operation on the work W matches the target coating pattern width WT. Can be made.

As described above, according to the coating apparatus of this embodiment, the coating pattern width on the work W can be surely matched with the desired coating pattern width, and the discharge amount of the coating agent 5 is controlled to be substantially constant. Therefore, the film thickness of the coating agent 5 applied to the work W can be made uniform without excess or deficiency. In this way, the coating material 5 is applied to the work W with a constant coating pattern width and a uniform film thickness.
It can be applied to the workpiece W from the application gun 2.
It is possible to limit the amount of coating agent 5 applied to
Therefore, it is possible to reduce the cost by keeping the amount of the coating agent 5 used as necessary while ensuring the required quality.

In the present embodiment, the case where PVC is applied to the work W has been described, but it goes without saying that the present invention can be applied to the case where another coating agent such as a sealer is applied.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a coating device according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of the apparatus shown in FIG.

3 is a flow chart for explaining the operation of the apparatus of FIG.

4 is a flow chart for explaining the operation of the apparatus of FIG.

FIG. 5 is a diagram for explaining the operation of the apparatus of FIG.

FIG. 6 is a diagram for explaining the operation of the apparatus of FIG.

FIG. 7 is an explanatory view for explaining the operation of the apparatus of FIG.

[Explanation of symbols]

2 ... Coating gun, 5 ... Coating material, 25 ... Nozzle, 31 ... Drawing part.

Claims (1)

[Claims] 1. A method for controlling a coating pattern width of a coating agent sprayed toward a workpiece from a coating gun disposed at a certain distance from the workpiece to a predetermined target pattern width, the coating method comprising: A pattern width detection step of ejecting the coating agent from the coating gun at a substantially constant discharge flow rate and detecting the coating pattern width of the coating agent at that time, and comparing the detected coating pattern width with the target pattern width A distance setting step of setting the distance between the coating gun and the work for matching both pattern widths based on the width deviation;
A coating pattern of the coating agent, comprising: a coating step of spraying the coating agent having a substantially constant discharge flow rate from the coating gun toward the workpiece at a set distance between the coating gun and the workpiece. Width control method.