JP2018103095A - Painting facility and painting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high production efficiency without generating a color difference failure at the integration time, even when a metal vehicle main body and a resin bumper which have each different heat capacity are baked and dried almost simultaneously.SOLUTION: A vehicle main body 2 and bumpers 3, 4 which are painted integrally with the same paint are separated, and baked and dried in each baking-and-drying furnace 11, 12, and a hue of the vehicle main body 2 after finish of baking-and-drying is compared with a hue of the bumpers 3, 4 in the middle of baking-and-drying to thereby detect a color difference. When the color difference is within a prescribed tolerance, the bumpers 3, 4 in a rapid feed area 17 are fed rapidly, and the bumpers 3, 4 are fitted to the vehicle main body 2 in a vehicle body integration part 24, to thereby integrate the car body M1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating facility and a coating method in which the same paint is applied collectively to a metal workpiece and a resin workpiece that are assembled together and then individually baked and dried.

  For example, vehicles such as automobiles tend to switch from conventional metal workpieces to resin workpieces from the viewpoints of weight reduction and design. In the painting process, the metal material and the resin material are different in thermal strength and expansion coefficient, and therefore, in a separate process, a dedicated paint is applied and then a baking and drying process is performed.

  By the way, when paint is applied to metal workpieces and resin workpieces in separate steps, and then baking and drying is performed, hue deviation tends to occur in the finish of both workpieces, and paint adjustment for color matching It is necessary to check the hue.

  Therefore, for example, Patent Document 1 (Patent No. 3031747) discloses a technique in which a metal body body and a resin bumper assembled to the body body are painted and dried separately in the same process. Is disclosed.

Japanese Patent No. 3031747 JP 7-88422 A

  In the technique disclosed in the above-mentioned document, the baking and drying treatment of the painted surface for the metal body body and the resin bumper is performed in separate steps, so it is necessary to check the hue when assembled, which is complicated. Work is required.

  For this reason, for example, in Patent Document 2 (Japanese Patent Laid-Open No. 7-88422), a metal body body and a resin bumper are coated on the same line, and then the metal body and the resin bumper are baked. A technique for preventing a color difference defect by simultaneously performing a baking drying process in a drying furnace is disclosed.

  By the way, in the technique disclosed in Patent Document 2, when performing the baking and drying by passing the metal body body and the resin bumper having greatly different heat capacities through the same baking and drying furnace, It is necessary to set the baking / drying temperature of either the metal body body or the resin bumper.

  For example, when the temperature of the baking / drying furnace is set corresponding to the metal body body, the resin bumper is subjected to the baking / drying process at an excessive temperature, and may be thermally deformed. Therefore, it is necessary to bake and dry the resin bumper while maintaining a posture in which the resin bumper is not easily thermally deformed using a jig or the like. However, if the orientation is changed to prevent thermal deformation of the resin bumper when baking and drying in the baking drying oven, baking is performed with the resin bumper assembled to the metal body. Compared to the case, there is a disadvantage that the color difference defect at the mating portion with the metal vehicle body is easily noticeable.

  In view of the above circumstances, the present invention does not cause the resin work to be thermally deformed even when the metal work and the resin work having different heat capacities are baked and dried almost simultaneously, and causes a color difference defect when assembled. It aims at providing the painting equipment which can obtain high production efficiency, and the painting method.

  The first aspect of the present invention is a coating process in which the same paint is applied to a metal workpiece and a resin workpiece to be attached to the metal workpiece, and the metal workpiece and the resin workpiece to which the same paint is applied. And a metal workpiece baking and drying step and a resin workpiece baking and drying step, and a workpiece assembly step for assembling the metal workpiece and the resin workpiece after baking and drying are provided on the line. In the painting equipment, the metal workpiece hue detection process for detecting the hue of the metal workpiece that has been baked and dried, and the hue of the resin workpiece that has been baked and dried for a predetermined time provided in the middle of baking drying The color difference is detected from the two hues detected in the resin workpiece hue detection step and the two hue detection steps, and the color difference is within a preset allowable range. A controller having a color difference detection evaluation process for evaluating whether or not, and when the color difference is determined to be within a preset allowable range in the color difference detection evaluation process, the metal workpiece and the resin workpiece And a workpiece assembly step provided on the line to be assembled.

  The second aspect of the present invention is to apply the same paint to the metal workpiece and the resin workpiece attached to the metal workpiece in a lump, and then apply the metal workpiece and the resin workpiece to which the same paint is applied. In the coating method in which the metal workpiece and the resin workpiece after baking and drying are assembled at different temperatures, the hue of the metal workpiece after baking and drying is detected, and baking and drying is performed for a predetermined time. The hue of the resin workpiece is detected, the color difference between the two hues is detected, it is determined whether the color difference is within a preset allowable range, and the color difference is determined to be within the allowable range. In this case, the metal workpiece and the resin workpiece are assembled.

  According to the present invention, when the color difference between the hue of a metal workpiece that has been individually baked and dried and the hue of a resin workpiece is detected, and the color difference is within a preset allowable range, the metal workpiece And resin workpieces are assembled, so that even if metal workpieces and resin workpieces having different heat capacities are individually baked and dried, they do not cause color difference defects or thermal deformation, and are high. Production efficiency can be obtained.

Schematic configuration diagram of painting equipment Schematic configuration diagram of baking drying adjustment calculation unit Flow chart showing paint line control processing routine (part 1) Flow chart showing paint line control processing routine (part 2) Flow chart showing body body baking and drying process / inspection routine Bumper baking drying process / inspection flowchart Characteristic chart showing color difference tolerance

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the vehicle body 2 is shown as an example of a metal workpiece, and the front and rear bumpers 3 and 4 attached to the vehicle body 2 are shown as an example of a resin workpiece.

  A painting facility 1 shown in FIG. 1 performs a painting process on a vehicle body 2 that moves along a line, and a front bumper 3 and a rear bumper 4 that are attached to the front and rear of the vehicle body 2. In addition, the arrow in a figure shows the flow direction of a line.

  As shown in FIG. 1, on the upstream line of the painting facility 1, a pair of vehicle body 2 and bumpers 3, 4 are individually attached to a transport jig (not shown) such as a carriage. A mounting process 5 for mounting is provided, and the vehicle body M <b> 1 mounted on the transport jig is transported to the coating process 6. In this application process 6, the same paint is applied integrally to the conveyed vehicle body M1.

  A vehicle body sorting portion 7 is provided downstream of the coating process 6, and a vehicle body separating portion 8 is further provided downstream thereof. The vehicle body 2 and the pair of bumpers 3 and 4 respectively placed on a dedicated conveying jig (not shown) are provided with production IDs storing common identification information. The vehicle body allocation unit 7 is provided with a vehicle body ID information acquisition unit 16 that reads the production ID. Further, the vehicle body separation unit 8 separates the vehicle body 2 and the pair of bumpers 3 and 4 that are respectively placed on a dedicated conveying jig (not shown).

  Downstream of the vehicle body separating unit 8, a vehicle body baking and drying process 9 as a metal workpiece baking and drying process and a bumper baking and drying process 10 as a resin workpiece baking and drying process are arranged in parallel. Each of these baking and drying steps 9 and 10 includes a high-temperature baking / drying furnace 11 as a high-temperature baking / drying section and a low-temperature baking / drying furnace 12 as a low-temperature baking / drying section. A vehicle body hue detection step 13 is provided as a workpiece hue detection step. Further, a bumper hue detection step 14 as a resin workpiece hue detection step is provided downstream of the low-temperature baking / drying furnace 12. Further, a fast-forward area 17 as a fast-forward process is continued downstream of the bumper hue detection process 14.

  Since the metal vehicle body 2 and the resin bumpers 3 and 4 have different heat capacities and the like, the baking temperatures and baking times set for the baking and drying furnaces 11 and 12 are also different. In the present embodiment, the baking temperature corresponding to the heat capacity of the bumpers 3 and 4 is set lower than the baking temperature for the vehicle body 2 and the baking time is set longer than the baking time for the vehicle body 2. Therefore, the furnace length of the low temperature baking / drying furnace 12 is set longer than the furnace length of the high temperature baking / drying furnace 11.

  The hue detection step 13 is provided with a vehicle body hue information acquisition unit 15, and the hue detection step 14 is provided with a bumper hue information acquisition unit 18. The vehicle body hue information acquisition unit 15 includes a color camera, acquires a color image of the vehicle body 2 after baking finish, and detects the hue (Lab value). Similarly, the bumper hue information acquisition unit 18 also has a color camera, acquires color images of the bumpers 3 and 4 during the baking and drying process, and detects the hue (Lab value).

  Further, a painted surface inspection process 19 is continued downstream of the body body baking / drying process 9, and further, a body body distribution part 20 is continued downstream thereof. An inspection booth is provided in the painted surface inspection step 19, and a painted surface information acquisition unit 23 including a color camera that acquires information on the painted surface of the vehicle body 2 is provided in the inspection booth. This inspection booth is for inspecting appearance defects (surface defects) due to scratches or the like on the painted surface from the painted surface information acquired by the painted surface information acquisition unit 23. The inspection of the appearance defect is described in detail in Japanese Patent Application Laid-Open No. 2006-90309 previously filed by the present applicant, and the description thereof is omitted here.

  Furthermore, a vehicle body main body carry-out adjusting unit 21 is continued downstream of the vehicle body main body allocating unit 20. On the other hand, the bumper carry-out adjusting unit 22 is continued downstream of the bumper baking drying process 10. The vehicle body carry-out adjustment unit 21 includes a plurality of vehicle body stock lanes 21a for stocking the vehicle body 2 and a plurality of rework lanes 21b for correcting defects in the appearance of the vehicle body 2 in parallel. The upstream of the lanes 21a and 21b is connected to the vehicle body distribution unit 20 via the vehicle body carry-in lane L1. Further, the downstream of each vehicle body stock lane 21a and each repair lane 21b is joined to the vehicle body return lane L2, and this vehicle body return L2 is connected to the vehicle body carry-in lane L1 downstream of the vehicle body distribution part 20. Has been.

  Further, a vehicle body assembly portion 24 as a work assembly portion that collects the vehicle body 2, the front bumper 3, and the rear bumper 4 is interposed in the vehicle body return lane L 2. Each body body stock lane 21 a is accommodated in the body body side ID collation unit 25. Further, the downstream of each vehicle body main body stock lane 21a and each repair lane 21b is joined to the bypass lane L3 and connected to the vehicle body main body return lane L2 downstream of the vehicle body assembly portion 24.

  On the other hand, the bumper carry-out adjusting unit 22 has a closed loop bumper return lane L4, and a plurality of bumper stock lanes 26 for stocking the bumpers 3 and 4 after painting in a pair are arranged in parallel on the bumper return lane L4. By-pass connection is provided in the installed state. Further, a bumper side ID verification unit 27 is interposed downstream of the bumper baking drying process 10 upstream of the bumper return lane L4. Further, a vehicle body assembly portion 24 is interposed downstream of the bumper stock lane 26 in the bumper return lane L4.

  In the vehicle body assembly portion 24, a pair of bumpers 3 and 4 conveyed in the bumper return lane L4 are attached to the vehicle body 2 conveyed in the vehicle body return lane L2, and the vehicle body M1 is assembled. The downstream side branches off from the vehicle body main body return lane L2, and is connected to the outfitting line L5 that continues to the subsequent process (imitation process).

  Further, the vehicle body main body side ID information acquisition unit 28, the bumper side ID, which reads information on a common production ID attached to the vehicle body 2 and the pair of bumpers 3, 4 to each ID verification unit 25, 26. An information acquisition unit 29 is provided.

  Further, a vehicle body distribution gate G1 is provided at a branch portion between the vehicle body carry-in lane L1, each vehicle body stock lane 21a, and each rework lane 21b, and each vehicle body stock lane 21a and each rework lane 21b. And a bypass distribution gate G2 is provided at a branch portion between the bypass lane L3 and the bypass lane L3. Further, bumper stock distribution gates G3 and G4 are respectively provided at the branch portions of the bumper return lane L4 and the bumper stock lane 26 on the upstream side and the downstream side. Further, an assembly portion gate G5 is provided at a branch portion between the vehicle body main body return lane L2 and the outfitting line L5 on the downstream side of the vehicle body assembly portion 24.

  Each of these gates G1 to G5 sets the transport destination of the vehicle body 2 and the bumpers 3 and 4 in the vehicle body 2 and the pair of bumpers 3 and 4 after the completion of painting, and the vehicle assembly part 24. As shown in FIG. 2, the gate of the vehicle body distribution gate G <b> 1 is switched by a drive signal from the vehicle body distribution gate drive unit 31, and the bypass distribution gate G <b> 2 is supplied from the bypass distribution gate drive unit 32. The gate is switched by the drive signal. The bumper stock distribution gates G3 and G4 are switched by a drive signal from the bumper stock distribution gate drive unit 33, and the assembly unit gate G5 is switched by a drive signal from the assembly unit distribution gate drive unit 34.

  As shown in FIG. 2, the vehicle body color information acquisition unit 15 disposed in the hue detection step 13, the vehicle body ID information acquisition unit 16 disposed in the vehicle distribution unit 7, and the bumper hue provided in the hue detection step 14. The information acquired by the information acquisition unit 18, the vehicle body main body side ID information acquisition unit 28 provided in the vehicle body main body side ID verification unit 25, and the bumper side ID information acquisition unit 29 provided in the bumper side ID verification unit 27 is controlled. Read by part 41. The control unit 41 is also connected to a work information input unit 30 such as a keyboard, mouse, touch panel, etc., from which an operator inputs work contents such as correction work from the outside.

  The control unit 41 includes a microcomputer and peripheral devices including a storage unit 43 such as an HDD. The microcomputer includes a CPU, a ROM, a RAM, and the like. The CPU follows a program stored in the ROM. Predetermined arithmetic processing is performed. This computer has a function as a production adjustment calculation unit 42, and the storage unit 43 has fixed data such as production ID information for each vehicle body M 1, and information acquisition units 15, 16, 18, 28, 29. Each piece of information acquired in step 1 is sequentially stored in association with production ID information.

  The production adjustment calculation unit 42 reads the hue (vehicle body Lab value) of the vehicle body 2 after baking painting acquired by the vehicle body hue information acquisition unit 15. Note that the Lab value indicates a color system of L *, a *, and b *, where L * is brightness and a * and b * are values that represent color.

In addition, the hue (bumper Lab value) of the pair of bumpers 3 and 4 after baking painting acquired by the bumper hue information acquisition unit 18 is read, and the color difference ΔE * based on the hue of the vehicle body 2 is obtained.
ΔE * = [(vehicle body L * −bumper L *) ² + (car body a * −bumper a *) ² + (car body b * −bumper b *) ² ] ^1/2 (1)
Calculate from

  Then, it is evaluated whether or not the color difference ΔE * is within an allowable range. If the color difference ΔE * is within the allowable range, the pair of bumpers 3 and 4 and the vehicle body 2 are assembled to form the vehicle body M1. On the other hand, if the color difference E * is out of the allowable range, it is checked whether or not the color difference can be adjusted. If possible, the color difference ΔE * is set within the allowable range and assembled to the vehicle body 2.

  Further, a defect inspection control unit 51 and a post-process calculation unit 52 are connected to the production adjustment calculation unit 42 so as to be capable of bidirectional communication. The defect inspection control unit 51 inspects the appearance defect (surface defect) due to scratches or the like of the painted surface based on the painted surface information from the painted surface information acquisition unit 23 provided in the inspection booth in the painted surface inspection process 19. . When the defect inspection control unit 51 detects an appearance defect, the production adjustment calculation unit 42 corrects the vehicle body 2 and transports it to the lane 21b. On the other hand, the production adjustment calculation unit 42 transmits the production ID information of the vehicle body M1 to be carried out to the post-process calculation unit 52.

  Next, the effect | action of the coating equipment 1 comprised in this way is demonstrated. When the vehicle body M1 composed of the vehicle body 2 and the pair of front and rear bumpers 3 and 4 is loaded into the application process 6 in a state of being placed on the conveying jig, the same paint is applied in a lump. Then, the vehicle body M <b> 1 that has been applied with the paint is conveyed to the vehicle body sorting unit 7.

  Then, the production adjustment calculation unit 42 executes a hue adjustment process according to the routines shown in FIGS. Each routine is executed in parallel.

[Paint line control processing]
When the vehicle body M1 is carried into the vehicle body distribution unit 7, in the painting line control processing routine shown in FIGS. 3 and 4, first, in step S1, the vehicle body ID information acquisition unit 16 disposed in the vehicle body distribution unit 7 performs. The obtained production ID of the vehicle body M1 (each production ID on the vehicle body 2 side and the bumpers 3 and 4 side) is read, and the vehicle body M1 is conveyed to the vehicle body separation unit 8 in step S2.

  When the vehicle body M1 is conveyed to the vehicle body separation unit 8, in step S3, the vehicle body M1 is separated into the vehicle body 2 and the pair of front and rear bumpers 3 and 4. In step S4, the vehicle body 2 and the pair of front and rear bumpers 3 and 3 are separated. 4 are placed on the conveying jigs, respectively, and are carried out to the high temperature baking / drying furnace 11 in the body baking baking process 9 and the low temperature baking / drying furnace 12 in the bumper baking drying process 10, respectively.

  The vehicle body color information (vehicle body Lab value) detected in the vehicle body baking / drying processing / inspection routine shown in FIG. 5 and the bumper hue information (bumper Lab value) detected in the bumper baking / drying processing / inspection routine shown in FIG. ) And wait.

[Body drying / inspection of car body]
In the vehicle body baking / drying routine / inspection routine shown in FIG. 5, first, the vehicle body 2 is carried into the high-temperature baking / drying furnace 11 in step S31, and the vehicle body 2 is baked and dried when passing through the baking / drying furnace 11 in step S32. Execute the process.

  Thereafter, the vehicle body 2 that has been baked and dried to a predetermined degree is conveyed to the hue detection step 13, and the process proceeds to step S 33, where the vehicle body color is determined based on the color image of the outer surface of the vehicle body 2 captured by the vehicle body hue information acquisition unit 15. The (body body Lab value) is detected. In step S34, the vehicle body color information (vehicle body Lab value) is transmitted to the coating line control processing routine.

  Then, it progresses to step S35, the vehicle body 2 is conveyed to the coating surface inspection process 19, and it is made into the image imaged with the coating surface information acquisition part 23 which consists of a color camera etc. which are provided in the inspection booth of this coating surface inspection process 19. The surface defects such as scratches formed on the surface are inspected as usual. And it progresses to step S36, the presence or absence of a surface defect is determined, and when a surface defect is not detected, it progresses to step S37, and the process which carries out the said vehicle body 2 to a stock lane in the vehicle body distribution part 20 is performed. On the other hand, when a surface defect is detected, it progresses to step S38, and the process which carries out the said vehicle body main body 2 to a hand pushing lane in the vehicle body distribution part 20 is performed.

  Then, the vehicle body 2 transferred to the vehicle body distribution unit 20 switches the vehicle body distribution gate G1 provided at the branch portion of the vehicle body transfer lane L1 in accordance with instructions from the vehicle body baking / drying processing / inspection routine. Then, the vehicle body 2 is assigned to the vehicle body stock lane 21a and the repair lane 21b in a predetermined manner and carried out. In the repair lane, the surface defect of the vehicle body 2 is repaired to a predetermined level, and the repaired vehicle body 2 is returned to the vehicle body stock lane 21a for stocking.

[Bumper baking drying and inspection]
In the bumper baking / drying processing / inspection routine shown in FIG. 6, which is executed in parallel with the above-described body baking / drying processing / inspection routine, first, in step S41, the pair of bumpers 3 and 4 are subjected to the bumper baking / drying step 10 of FIG. It carries in to the low temperature baking drying furnace 12, and the baking drying process 10 is performed predetermined by step S42.

  Next, the baking and drying process is executed for a preset time, and the process proceeds to step S43. In the hue detection step 14, the colors of the bumpers 3 and 4 in the middle of the baking paint acquired by the bumper hue information acquisition unit 18 provided therewith. The bumper hue (bumper Lab value) is detected based on the image, and the process proceeds to step S44. This bumper hue information (bumper Lab value) is transmitted to the painting line control processing routine and waits for an instruction from the painting line control processing routine. To do.

[Paint line control processing]
In step S5 of the coating line control processing routine, the vehicle body color information (vehicle body Lab value) detected in the vehicle body baking / drying processing / inspection routine is read, and in step S6, the bumper inspected in the bumper baking / drying processing / inspection routine. Hue information (bumper Lab value) is read. In step S7, the body body Lab value is compared with the body body Lab value, and a color difference ΔE * with the hue of the body body 2 as a reference is calculated from the above-described equation (1).

  In step S8, with reference to the characteristic diagram showing the color difference allowable range shown in FIG. 7, it is evaluated whether or not the color difference ΔE * is within the allowable range ± α, that is, | ΔE * | <α. The processes in steps S7 and S8 correspond to the color difference detection evaluation process of the present invention. Further, the baking time t1 in FIG. 7 is the minimum baking time for the bumpers 3 and 4, and the normal baking time is, for example, as described in A1 or A2 in FIG. The time is set longer than the minimum baking time t1.

  If it is determined that the color difference ΔE * is out of the allowable range of | ΔE * |> α (for example, A1.A2, A4, A5 in FIG. 7), the process branches to step S9 to turn on the lamp and the buzzer. An abnormal alarm is notified to the worker by blowing sound, etc., and the process proceeds to step S10, where a bumper hue adjustment instruction is transmitted to the bumper baking coating / inspection routine.

  On the other hand, if it is determined that the color difference ΔE * is within the allowable range of | ΔE * | ≦ α (for example, A3 in FIG. 7), the process proceeds to step S11, and a bumper fast-forward instruction is given to the bumper baking coating process / inspection routine. Wait until the bumpers 3 and 4 are transported to the bumper-side ID verification unit 27.

[Bumper baking drying and inspection]
In step S45 of the bumper baking / drying processing / inspection routine shown in FIG. 6, it is checked whether or not there is a bumper fast-forward instruction from the coating line control processing routine. If there is no bumper fast-forward instruction, that is, if a bumper hue adjustment instruction is present, step S45 is performed. The process branches to S46, where the current color difference ΔE * with respect to the color difference characteristic diagram shown in FIG. 7 is examined (for example, A1, A2, A4, or A5 in FIG. 7), and the bumper hue adjustment is possible It is determined whether or not.

  That is, as shown in FIG. 7, the hues (bumper Lab values) of the bumpers 3 and 4 increase with a certain inclination as the printing time is increased. Therefore, the inclination of the base line Lin set in advance and the current position of the color difference ΔE * (for example, A1.A2, A4, A5 in FIG. 7) are compared. For example, as indicated by A1 and A2, if the value is on the allowable range ± α side of the base line Lin and is below the allowable range ± α, it is determined that the bumper hue can be adjusted, and the process proceeds to step S47.

  On the other hand, for example, as indicated by A4 and A5, if the distance is on the opposite tolerance range ± α side of the baseline Lin or exceeds the tolerance range ± α, it is determined that the hue cannot be adjusted, and the process branches to step S48. In step S48, reprocessing such as transporting to a drawing lane (not shown) and executing repainting is performed.

  Further, when proceeding to step S47, a printing increase time (for example, from A1 to time t2, and from A2 to time t3) within the allowable range ± α is calculated from the current position of the color difference ΔE * and the slope of the base line Lin. Then, the hue is adjusted by baking and drying in the fast-forwarding area 17 for the printing additional time. After the printing additional time is reached, the process proceeds to step S49. Accordingly, the fast-forward area 17 has a function as a hue adjustment process of the present invention.

  On the other hand, if it is determined in step S45 that there is a bumper fast-forward instruction, the process directly proceeds to step S49.

  When the process proceeds from step S45 or step S47 to step S49, the bumpers 3 and 4 are fast-forwarded in the fast-forwarding area 17 and conveyed to the bumper-side ID verification unit 27 at an early stage. By causing the bumpers 3 and 4 to fast-forward within the fast-forwarding area 17, production efficiency can be increased.

[Paint line control processing]
In step S12 of the coating line control processing routine shown in FIGS. 3 and 4, the production ID attached to the bumpers 3 and 4 that are acquired by the bumper side ID information acquisition unit 29 and conveyed to the bumper side ID verification unit 27. Is read. In step S13, the production ID of the vehicle body 2 stocked in the vehicle body stock lane 21a is read, and the vehicle body 2 having the same production ID as the production ID attached to the bumpers 3 and 4 is collated. .

  Next, in step S14, it is checked whether or not the vehicle body 2 having a production ID that matches the production ID of the bumpers 3 and 4 is detected. If no matching vehicle body 2 is detected, the process branches to step S15 to notify the operator of an abnormal alarm by turning on a lamp, blowing a buzzer, etc., and then proceed to step S16, where the bumper stock distribution gate G3 is driven, and the bumpers 3 and 4 are carried out to the bumper stock lane 26 and waited.

  The vehicle body 2 corresponding to the bumpers 3 and 4 stocked in the bumper stock lane 26 has been fixed by a rework lane 21b, and the reworked vehicle body 2 is transferred to the vehicle body stock lane 21a and stocked. Is done. Therefore, when the vehicle body 2 having a production ID that matches the production ID of the bumpers 3 and 4 stocked in the bumper stock lane 26 is detected in the vehicle body stock lane 21a, the operator waits for a predetermined timing, The ID verification in both ID verification units 25 and 27 is temporarily suspended, and in this state, the bumper 3 and 4 and the vehicle body 2 having the same production ID stocked in the stock lanes 21a and 26 are connected to the vehicle body assembly unit 24. To transport.

  On the other hand, if the vehicle body 2 having the same production ID is stocked in the vehicle body stock lane 21a, the bypass distribution gate G2 is driven to transport the vehicle body 2 to the vehicle assembly part 24 in step S17. Further, the bumpers 3 and 4 carried into the bumper-side ID verification unit 27 are also conveyed to the vehicle body assembly unit 24.

  Then, the process proceeds to step S18, and the vehicle body assembly portion 24 attaches the bumpers 3 and 4 to the carried vehicle body 2 to collect the vehicle body M1. Then, it progresses to step S19 and the assembled vehicle body M1 is carried out to a post process (impersonation process).

  As described above, in the present embodiment, the baking and drying processes for the metal vehicle body 2 and the resin bumpers 3 and 4 having greatly different heat capacities are individually performed in the baking and drying furnaces 11 and 12, and then assembled together. Without obtaining the hue (vehicle body Lab value, bumper Lab value) individually, a color difference ΔE * for comparing both Lab values is obtained, and if this color difference ΔE * is within a predetermined allowable range ± α, 2 and the resin bumpers 3 and 4 are assembled, so that the bumpers 3 and 4 are not thermally deformed during baking and drying, and no color difference defect is detected after the assembly. High production efficiency can be obtained.

  Furthermore, when the color difference ΔE * is outside the allowable range ± α, if the color difference ΔE * can be kept within the allowable range ± α by performing additional baking and drying for a predetermined time, obtain the additional baking and drying time. Therefore, the color difference ΔE * can be within the allowable range ± α with a high probability.

  Moreover, since the fast-feed area 17 is provided and the bumpers 3 and 4 after baking and drying are fast-forwarded, higher productivity can be obtained.

  The present invention is not limited to the above-described embodiment. For example, the metal vehicle body 2 and the resin bumpers 3 and 4 are examples of a metal workpiece and a resin workpiece, and are not limited thereto. It is not a thing. The target workpiece is not limited to vehicle parts.

1 ... painting equipment,
2 ... Body body,
3 ... Front bumper,
4 ... Rear bumper,
5 ... Mounting process,
6 ... coating process,
7 ... body sorting part,
8 ... body separation part,
9 ... Body body baking and drying process,
10 ... Bumper drying process,
11 ... high temperature baking drying oven,
12 ... Low temperature baking drying oven,
13, 14 ... hue detection step,
15 ... body color information acquisition unit
16 ... Information acquisition unit,
17 ... Fast forward area,
18 ... Bumper hue information acquisition unit,
19 ... Paint surface inspection process,
20 ... body body distribution part,
21 ... Car body main body carry-out adjustment part,
21a ... body lane,
21b ... Rework lane,
22 ... Bumper carry-out adjustment section,
23 ... Paint surface information acquisition unit,
24. Body assembly part,
25 ... body body side collation part,
26 ... Bumper Stock Lane,
27 ... Bumper side verification part,
28 ... body body side ID information acquisition unit,
29 ... Bumper side ID information acquisition unit,
30 ... Work information input part,
31 ... body body distribution gate drive unit,
32. Bypass distribution gate drive unit,
33 ... Bumper stock distribution gate drive unit,
34. Assembly part distribution gate drive part,
41. Control unit,
42 ... Production adjustment calculation unit,
43. Storage unit,
51 ... Defect inspection control unit,
52. Post-processing arithmetic unit,
G1 ... Body body sorting gate,
G2: Bypass distribution gate,
G3, G4 ... Bumper stock distribution gate,
G5 ... Gathering gate,
L1 ... Car body body loading lane,
L2 ... Body return lane,
L3 ... Bypass lane,
L4 ... Bumper return lane,
L5 ... Outfitting line,
Lin ... Baseline,
M1 ... the car body,
ΔE * Color difference

Claims (8)

An application step of collectively applying the same paint to a metal workpiece and a resin workpiece attached to the metal workpiece;
A metal workpiece baking and drying step and a resin workpiece baking and drying step of baking and drying the metal workpiece and the resin workpiece coated with the same paint at different temperatures;
In a painting facility in which a work assembly step for assembling the metal workpiece and the resin workpiece after baking and drying is provided on a line,
A metal workpiece hue detection step for detecting the hue of the metal workpiece after baking and drying;
A resin workpiece hue detection step for detecting the hue of the resin workpiece that has been baked and dried for a predetermined time set in the middle of baking and drying,
A controller having a color difference detection evaluation step for detecting a color difference from the two hues detected in the both hue detection step and evaluating whether the color difference is within a preset allowable range;
A work assembly step provided on the line for assembling the metal workpiece and the resin workpiece when it is determined in the color difference detection evaluation step that the color difference is within a preset allowable range; A painting facility characterized by that. When it is determined in the color difference detection evaluation step that the color difference is outside the preset allowable range, the resin workpiece is further baked and dried in the resin workpiece baking and drying step to adjust the hue of the resin workpiece. The painting equipment according to claim 1, further comprising a hue adjusting step. The resin workpiece baking and drying step is provided with a fast-forwarding step for fast-forwarding the resin workpiece when it is determined in the color difference detection and evaluation step that the color difference is within a preset allowable range. The painting equipment according to claim 1 or 2, characterized by the above-mentioned. A production ID in which common information is stored in the metal workpiece and the resin workpiece is attached,
The painting equipment according to any one of claims 1 to 3, wherein in the workpiece assembly step, the metal workpiece and the resin workpiece having the same production ID information are assembled. After the same paint is applied to the metal workpiece and the resin workpiece attached to the metal workpiece in a batch,
The metal workpiece and the resin workpiece coated with the same paint are baked and dried at different temperatures,
In the painting method of assembling the metal workpiece and the resin workpiece after baking and drying,
Detecting the hue of the metal workpiece after baking and drying;
In addition, the hue of the resin workpiece that has been baked and dried for a predetermined time is detected,
Detecting a color difference between the two hues to determine whether the color difference is within a preset allowable range;
When it is determined that the color difference is within an allowable range, the metal work and the resin work are assembled together. 6. The coating method according to claim 5, wherein when the color difference is outside a preset allowable range, the resin workpiece is further baked and dried to adjust the hue of the resin workpiece. The coating method according to claim 5 or 6, wherein when it is determined that the color difference is within a preset allowable range, the resin workpiece is fast-forwarded. A production ID in which common information is stored in the metal workpiece and the resin workpiece is attached,
The coating method according to claim 5, wherein the metal workpiece and the resin workpiece having matching production ID information are assembled.

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