JP6428305B2 - Paint drying apparatus and paint drying method - Google Patents

Description

  The present invention relates to a paint drying apparatus and a paint drying method.

  In the car body painting line, various types such as electrodeposition coating, intermediate coating and top coating, and rust prevention treatment are performed with lids such as doors and hoods attached to the body shell body for the purpose of productivity improvement and color matching. Processing is performed. In intermediate coating and top coating, the vehicle body to be coated is placed on the coating carriage, the coating is applied while being transported through the painting booth, and then the entire automobile body is transported to the coating drying furnace. Bake and dry the wet coating. The coating drying apparatus used in the painting line is provided with a hot-air supply duct in a tunnel-shaped drying furnace body, blows hot air over the entire automobile body transported in the drying furnace body, and burns and dries the wet coating film ( Patent Document 1).

Japanese Patent Publication No. 6-225

  Bake curable coatings are used for automobile bodies. For example, in the case of intermediate coating or top coating, holding at 140 ° C. for 20 minutes is the standard for quality assurance of cured coatings. However, in the conventional paint drying apparatus, hot air does not easily flow into a narrow portion such as around the hinge of the door due to the structure of the automobile body, compared to the outer plate portion where hot air is easily blown. For this reason, there is a problem that it is difficult to satisfy the quality assurance standard such as holding at 140 ° C. × 20 minutes for the narrow portion.

  The problem to be solved by the present invention is to provide a coating / drying apparatus and a coating / drying method capable of satisfying the drying conditions of the wet coating film over the entire automobile body.

  The present invention provides a body shell main body inside a mountain-shaped drying furnace main body including an ascending inclined portion on the inlet side, a descending inclined portion on the outlet, and a raised floor portion between the ascending inclined portion and the descending inclined portion. The paint drying apparatus and the paint drying method dries a wet paint film applied to an automobile body while conveying the automobile body with a side door attached to the back of the vehicle body backward. In at least the upstream region of the high floor portion of the present invention, the automobile body is transported in a posture that rises backward relative to the horizontal, and in the upstream region, the wet coating applied to the body shell body and the side door near the hinge. The problem is solved by blowing hot air locally toward the film.

  According to the present invention, the side door is automatically opened by its own weight when the automobile body passes the upward inclined portion of the entrance of the drying furnace body, and the automobile body is in a rearwardly raised posture at least in the upstream region of the high floor portion. Since it is transported, the side door is kept open. And at least in the upstream region of this high floor portion, by blowing hot air locally on the body shell body near the hinge and the wet coating applied to the side door in a state where the side door is open, predetermined drying conditions Can be satisfied. Furthermore, since the side door automatically closes by its own weight when the automobile body passes through the descending inclined portion of the outlet of the drying furnace body that follows this, a dedicated device for opening and closing the side door is provided throughout the drying furnace body. There is no need.

It is a whole process figure showing an example of the painting line to which one embodiment of the top coat painting drying device and method concerning the present invention is applied. It is a whole process figure which shows the other example of the coating line to which one embodiment of the top coat drying apparatus and method which concerns on this invention is applied. It is a side view which shows the state which mounted the motor vehicle body which concerns on one embodiment of this invention in the painting trolley | bogie. It is the front view which looked at the front door of the automobile body concerning one embodiment of the present invention from the room inner side. It is the front view which looked at the front door of the automobile body concerning one embodiment of the present invention from the room inner side. It is sectional drawing which follows the 2D-2D line | wire of FIG. 2A, Comprising: It is sectional drawing which shows an example of the narrow part containing a front pillar, a front door, and a hinge. It is sectional drawing which follows the 2E-2E line | wire of FIG. 2A, Comprising: It is sectional drawing which shows an example of the narrow part containing a center pillar, a rear door, and a hinge. It is a disassembled perspective view which shows an example of the hinge of FIG. 2B and FIG. 2C. It is the figure which looked at the state which opened the front door of the automobile body concerning one embodiment of the present invention from the back of the body shell main part. It is a side view which shows schematic structure of the top coat coating drying apparatus which concerns on one embodiment of this invention. It is sectional drawing which follows the 4A-4A line | wire of FIG. It is sectional drawing which follows the 4B-4B line | wire of FIG. It is a side view which shows schematic structure of the top coat drying apparatus which concerns on other embodiment of this invention. It is a side view which shows schematic structure of the top coat coating drying apparatus which concerns on other embodiment of this invention. It is a perspective view which shows an example of the door stopper jig | tool used with the top coat coating drying apparatus which concerns on one embodiment of this invention. It is sectional drawing which follows the 7B-7B line | wire of FIG. 7A, Comprising: It is sectional drawing which shows the mounting state of a door stopper jig | tool.

  In the following embodiments, the best embodiment of the present invention will be described by taking the top coat coating drying apparatus 1 to which the coating drying apparatus and the coating drying method of the present invention are applied as an example. However, the coating drying apparatus and the coating drying of the present invention will be described. The method can be applied to an intermediate coating drying device, an undercoating drying device (electrodeposition coating drying device), or an intermediate coating / top coating drying device described later, in addition to the top coating drying device.

  The top coat drying apparatus 1 of this embodiment is one of the apparatuses constituting the coating line PL, and dries the top coat film applied to the body shell B (also referred to as an automobile body B) mounted on the coating carriage 50. It is a device for baking on the automobile body B. In the following description, first, the outline of the automobile production line and the coating line PL will be described, and then the automobile body B and the top coat drying apparatus 1 will be described in detail.

  The automobile production line has four main lines: a press molding line PRL, a body assembly line (also referred to as a welding line) WL, a painting line PL, and a vehicle assembly line (also referred to as an outfitting line) ASL. It is composed of In the press molding line PRL, various panels constituting the automobile body B are respectively press-molded and conveyed to the vehicle body assembly line WL in the state of a single press. In the vehicle body assembly line WL, sub-assemblies are assembled for each part of the automobile body such as the front body, center floor body, rear floor body, and side body, and welding is performed on predetermined parts of the assembled front body, center floor body, and rear floor body. The underbody is assembled, and the side body and the roof panel are welded to the underbody to assemble the body shell main body B1 (referring to the body shell excluding the lid). Finally, lid parts such as a hood F, side doors D1 and D2, and a trunk lid T (or back door) assembled in advance are mounted on the body shell main body B1 via a hinge. Then, after passing through the painting line PL, it is conveyed to the vehicle assembly line ASL, and various automobile parts such as an engine, a transmission, a suspension device, and interior parts are assembled to the finished body shell.

  Next, the main structure of the coating line PL will be described. FIG. 1A and FIG. 1B are all process diagrams showing a coating line PL including a top coating drying apparatus to which the coating drying apparatus and method according to the present invention are applied. The coating line PL of the embodiment shown in FIG. 1A is a coating line by a three-coat three-bake coating method of undercoating, intermediate coating, and topcoating. On the other hand, in the coating line PL of the embodiment shown in FIG. 1B, the intermediate coating and the top coating are wet-on-wet in the same coating booth (the coating is applied on the uncured coating, the same applies hereinafter). This is a coating line by a 3-coat 2-bake coating method in which the intermediate coating film and the top coating film are simultaneously baked in the same coating drying furnace. Thus, the coating drying apparatus and method of the present invention can be applied to any of coating lines having different coating methods. In addition, this 3 coat 3 bake coating method and 3 coat 2 bake coating method are modified, and the 4 coat coating method in which the intermediate coating is applied twice, and the case where the top coating color is a special color with 2 tones are also used. The coating drying apparatus and method according to the present invention can be applied by modifying a part of a typical coating line PL. Hereinafter, the painting lines of FIGS. 1A and 1B will be described in parallel, but the same reference numerals will be given to common configurations, and description will be made with reference to the painting line of FIG. 1A. Both coatings of FIGS. 1A and 1B Differences between the lines will be described with reference to FIG. 1B.

  The coating line PL of the embodiment shown in FIG. 1A includes an undercoating process P1, a sealing process P2, an intermediate coating process P3, a water polishing process P4, an overcoating process P5, and a coating completion inspection process P6. In contrast, the coating line PL of the embodiment shown in FIG. 1B includes an undercoat process P1, a sealing process P2, an intermediate coating / top coating process P7, and a coating completion inspection process P6. That is, in the coating line PL of FIG. 1B, the two steps of the intermediate coating step P31 and the top coating step P51 shown in FIG. 1A are performed in one step of the intermediate coating / top coating step P71 of FIG. In addition, the two steps of the intermediate coating drying step P32 and the top coating drying step P52 shown in FIG. 1A are performed in one step of the intermediate coating / top coating drying step P72 of FIG. 1B. The intermediate coating / top coating process P7 of FIG. 1B will be described later.

  As shown in FIGS. 1A and 1B, the undercoat process P1 includes a pre-electrodeposition treatment process P11, an electrodeposition coating process P12, and an electrodeposition drying process P13. In the electrodeposition pretreatment process P11, the automobile body B (white body) transferred from the carriage of the vehicle body assembly line WL to the painting hanger (not shown) by the drop lifter D / L is transferred to a predetermined pitch by an overhead conveyor. It is continuously transported at a predetermined transport speed. The configuration of the automobile body B will be described later.

  Although not shown, the electrodeposition pretreatment process P11 generally includes a degreasing process, a water washing process, a surface adjustment process, a chemical conversion film forming process, a water washing process, and a draining process. The car body B that is carried into the painting line PL is attached with press oil, iron powder and other dust from welding in the press molding line PRL and the car body assembly line WL, so this is washed in the degreasing process and the water washing process. And remove. In the surface adjustment step, the surface adjustment agent component is adsorbed on the surface of the automobile body B, and the number of reaction starting points in the chemical conversion film forming step of the next step is increased. The adsorbed upper surface adjuster component becomes the core of the film crystal and accelerates the film formation reaction. In the chemical conversion film forming step, the chemical conversion film is formed on the surface of the automobile body B by immersing the automobile body B in a chemical conversion treatment solution such as zinc phosphate. In the water washing step and the water draining step, the automobile body B is washed with water and dried.

  In the electrodeposition coating process P12, the automobile body B that has been subjected to the pretreatment in the electrodeposition pretreatment process P11 is continuously transported at a predetermined pitch and a predetermined transport speed by an overhead conveyor. Then, the automobile body B is immersed in a ship-type electrodeposition tank filled with the electrodeposition paint, and a plurality of electrode plates provided in the electrodeposition tank and the automobile body B (specifically, having electric conductivity). Apply a high voltage to the paint hanger. Thereby, an electrodeposition coating film is formed on the surface of the automobile body B by the electrophoretic action of the electrodeposition paint. Examples of the electrodeposition paint include a thermosetting paint having an epoxy resin such as a polyamine resin as a base resin. As the electrodeposition paint, a cationic electrodeposition paint that applies a positive high voltage to the electrodeposition paint side is preferably used for rust prevention, but an anionic electrodeposition paint that applies a positive high voltage to the vehicle body B side. May be used.

  The automobile body B coming out of the electrodeposition tank in the electrodeposition coating process P12 is conveyed to the water washing process, and the electrodeposition paint adhering to the automobile body B is washed away using industrial water or pure water. At this time, the electrodeposition paint taken out from the electrodeposition tank at the time of unloading is also collected in this water washing step. At the stage where the water washing treatment is completed, an undried electrodeposition coating film having a thickness of about 10 μm to 35 μm is formed on the surface of the automobile body B and the bag structure. When the electrodeposition coating process P12 is completed, the automobile body B mounted on the coating hanger is transferred to the coating carriage 50 (described later with reference to FIG. 2A) by the drop lifter D / L. The drop lifter D / L installed between the electrodeposition coating process P12 and the electrodeposition drying process P13 shown in FIGS. 1A and 1B is installed between the electrodeposition drying process P13 and the sealing process P2. In the electrodeposition drying process P13, the automobile body may be transported in a state of being mounted on a paint hanger.

  In the electrodeposition drying process P13, the automobile body B mounted on the painting carriage is continuously conveyed by the floor conveyor at a predetermined pitch and a predetermined conveying speed. And it is baked and dried by holding a temperature of 160 ° C. to 180 ° C. for 15 minutes to 30 minutes, for example, so that a dry electrodeposition coating film having a film thickness of 10 μm to 35 μm is formed in the inner and outer plates and the bag structure part of the automobile body B. Is formed. In addition, from the electrodeposition drying process P13 to the coating completion inspection process P6, the coating carriage 50 on which the automobile body B is mounted is continuously conveyed by the floor conveyor, but the conveyance pitch and conveying speed of the coating carriage 50 in each process are as follows. According to the process. Therefore, the floor conveyor is constituted by a plurality of conveyors, and the conveyance pitch and conveyance speed in each process are set to predetermined values.

  In the present specification and claims, the term “paint” such as electrodeposition paint, intermediate coating and top coating refers to the liquid state before being applied to an object to be coated. The term “coating film” such as a film and a top coating film refers to an undried (wet) or dried state that has been applied to an object to form a film, and the two are distinguished. Further, in the present specification and claims, the upstream side and the downstream side mean upstream and downstream with respect to the conveyance direction of the automobile body B that is the article to be coated. Further, in the present specification and claims, the transportation of the vehicle body B backward means that the rear of the vehicle body B of the vehicle body B is on the front side in the transport direction and the front of the vehicle body is on the rear side. It means that the vehicle body B is transported along the front-rear direction axis, and that the vehicle body B is transported forward is the opposite, that is, the vehicle body front portion of the vehicle body B is the front side in the transport direction and the vehicle body rear portion is the rear side. In this state, it means to convey along the longitudinal axis of the vehicle body.

  In the sealing process P2 (including the undercoat process and the stone guard coat process), the automobile body B on which the electrodeposition coating film has been formed is transported, and the purpose is to prevent rust or seam at the steel sheet joint or the steel plate edge. A vinyl chloride resin sealing material is applied. In the undercoat process, a vinyl chloride resin-based chipping resistant material is applied to the tire house and the floor of the automobile body B. In the stone guard coating process, a polyester-based or polyurethane-based resin chipping resistant material is applied to the lower part of the body outer plate such as a side sill, a fender, or a door. In addition, these sealing materials and chipping resistant materials are cured in a dedicated drying step or an intermediate coating drying step P32 described below.

  The intermediate coating process P3 of the coating line PL in FIG. 1A includes an intermediate coating process P31 and an intermediate coating drying process P32. In the intermediate coating process P31, the automobile body B on which the electrodeposition coating film is formed is conveyed to the intermediate coating booth, and in the intermediate coating booth, on the inner plate portion of the automobile body such as the engine room, the hood inner, the trunk lid inner, An inner plate coating paint to which a coloring pigment corresponding to the outer plate color of the vehicle is added is applied. Then, the intermediate coating is applied to the outer plate such as the hood outer, the roof, the door outer, and the trunk lid outer (or the back door outer) by wet-on-wetting on the inner plate coating film. The outer plate portion is a portion that can be seen from the outside of the finished vehicle that has finished the outfitting process, and the inner plate portion is a portion that cannot be seen from the outside of the finished vehicle.

  In the intermediate coating drying process P32 of the coating line PL in FIG. 1A, the automobile body B is conveyed to the intermediate coating drying apparatus. And an undried intermediate coating film is inspected by baking, for example, by maintaining a temperature of 130 ° C. to 150 ° C. for 15 minutes to 30 minutes, and an intermediate coating film having a film thickness of 15 μm to 35 μm on the outer plate portion of the automobile body B. Is formed. In addition, a coating film for coating an inner plate having a film thickness of 15 μm to 30 μm is formed on the inner plate portion of the automobile body B. The inner plate paint and the intermediate paint are thermosetting paints using acrylic resin, alkyd resin, polyester resin or the like as a base resin, and may be either water-based paint or organic solvent-based paint.

  In the water-polishing process P4 of the painting line PL in FIG. 1A, the automobile body B that has been finished up to the intermediate coating process P3 is transported, and the surface of the intermediate coating film formed on the automobile body B using clean water and abrasives is removed. Grind. Thereby, the coating film adhesion between the intermediate coating film and the top coating film is improved, and the smoothness (coating skin and sharpness) of the top coating film on the outer plate portion is improved. This water research process P4 includes a water research drying process P41. In this water research drying process P41, the automobile body B passes through the draining and drying furnace, thereby drying the water adhering to the automobile body B.

  The top coating process P5 of the coating line PL in FIG. 1A includes a top coating process P51 and a top coating drying process P52. In the top coating process P51, the automobile body B that has finished the water research process P4 and the water research drying process P41 is transported. Then, in the top coat booth, the top coat base paint is applied to the outer plate portion of the automobile body B, and the top coat clear paint is applied to the outer plate portion of the automobile body B by wet on wet.

  The topcoat base paint and the topcoat clear paint are paints that use acrylic resin, alkyd resin, polyester resin, or the like as a base resin, and may be either water-based paints or organic solvent-based paints. The top coat base paint is applied after being diluted to about 80% by weight in consideration of the finish properties such as the orientation of the glitter pigment (solid content is about 20% to 40%). Is diluted to about 30% by weight and applied (solid content is about 70% to 80%). However, the top coating base paint generally has a coating solid content of 70% or more in a flash-off process after application (a stationary process in which the solvent spontaneously evaporates in the booth).

  The outer plate color of the automobile body B of the present embodiment is a metallic outer plate color including various bright pigments such as aluminum and mica, and the top coat base paint and the top coat clear paint are applied to the automobile body B. It is not limited to this. For example, the outer body color of the automobile body B may be a solid outer panel color. The solid outer plate color is a paint color that does not contain a luster pigment. In this case, the top coat base paint is not applied, and the top coat solid paint is applied instead of the top clear paint. As such a top coat solid paint, a base resin paint similar to the top coat base paint or the top coat clear paint can be exemplified.

  In the top coat drying process P52 of this embodiment, the automobile body B to which the top coat paint is applied in the top coat booth is conveyed to the top coat drying apparatus 1. In this top coat drying step P52, the automobile body B passes through the top coat drying apparatus 1 under a predetermined condition, whereby a dried top coat film is formed. In addition, the concrete structure of the topcoat drying apparatus 1 and topcoat drying process P52 of this embodiment is mentioned later.

  The film thickness of the topcoat base coating film is, for example, 10 μm to 20 μm, and the film thickness of the topcoat clear coating film is, for example, 15 μm to 30 μm. When the outer plate color of the automobile body B is a solid outer plate color, the film thickness of the top coat solid coating film is, for example, 15 μm to 35 μm. Finally, the automobile body (painted body) that has been painted is transported to the coating completion inspection process P6, where various inspections for evaluating the appearance of the coating film, the sharpness, and the like are performed.

  On the other hand, in the coating line PL shown in FIG. 1B, instead of the intermediate coating process P3, the water polishing process P4 (including the water polishing drying process P41) and the top coating process P5 shown in FIG. P7 is provided. The intermediate coating / top coating step P7 of this embodiment includes an intermediate coating / top coating step P71 and an intermediate coating / top coating drying step P72.

  In the intermediate coating / top coating process P71 of the coating line PL shown in FIG. 1B, the automobile body B on which the electrodeposition coating film is formed is transported to the intermediate coating / top coating booth, and in the first half zone of the intermediate coating / top coating booth, the engine room -An inner plate coating paint to which a coloring pigment corresponding to the outer plate color of the vehicle is added is applied to an inner plate portion of an automobile body such as a hood inner or a trunk lid inner. Then, the intermediate coating is applied to the outer plate such as the hood outer, the roof, the door outer, and the trunk lid outer (or the back door outer) by wet-on-wetting on the inner plate coating film. Next, in the second half zone of the intermediate coating / top coating booth, the top coat base paint is applied to the outer plate portion of the automobile body B, and this top coat base coat is wet-on-wet, and the top coat clear paint is applied to the outer plate portion of the automobile body B. Is painted. That is, the inner coating, intermediate coating, top coating base and clear coating are all applied wet-on-wet and simultaneously baked and dried in one top coating drying oven. Note that the wet coating applied to the automobile body B after applying the intermediate coating or the top coating is applied in order to suppress problems caused by repeated application of the wet coating and deterioration in sharpness. A flash-off step for increasing the coating NV of the film may be provided. As in the coating line PL shown in FIG. 1A, the base plate coating paint, intermediate coating, top coating base and clear coating used in this embodiment are made of an acrylic resin, alkyd resin, polyester resin or the like as a base. It is a thermosetting paint used as a resin, and may be either a water-based paint or an organic solvent-based paint.

  Next, an example of the automobile body B applied to the painting line PL of the present embodiment will be described in detail with reference to FIGS. 2A to 2G. FIG. 2A is a side view showing a state where the automobile body B according to the embodiment of the present invention is mounted on the painting carriage 50, and FIG. 2B shows the front door D1 of the automobile body B according to the embodiment of the present invention. 2C is a front view of the front door D2 of the automobile body B according to the embodiment of the present invention as viewed from the indoor side, and FIG. 2D is along the line 2D-2D of FIG. 2A. FIG. 2E is a cross-sectional view showing an example of a narrow portion N1 including the front pillar B4, the front door D1, and the hinge H1, and FIG. 2E is a cross-sectional view taken along line 2E-2E in FIG. FIG. 2F is an exploded perspective view showing an example of hinges H1 and H2 in FIGS. 2B and 2C, and FIG. 2G is an embodiment of the present invention. Of the automobile body B according to the form An open state Rontodoa D1, a view from the rear of the body shell body.

  As shown in FIG. 2A, the automobile body B of the present embodiment includes a body shell main body B1, a hood F that is a lid part, a front door D1, a rear door D2, and a trunk lid T. A front door opening B2 and a rear door opening B3 are formed on both side surfaces of the body shell body B1. The front door opening B2 is an opening defined by the front pillar B4, the center pillar B5, the roof side rail B8, and the side sill B9 of the body shell main body B1. The rear door opening B3 is an opening defined by the center pillar B5, the rear pillar B10, the roof side rail B8, and the side sill B9 of the body shell main body B1. Hereinafter, the front door opening B2 and the rear door opening B3 are collectively referred to as door openings B2 and B3. The trunk lid T as a lid part shown in the figure may be a back door depending on the vehicle body B type.

  Since the automobile body B of the present embodiment is a four-door sedan vehicle type as shown in the figure, the side door D has a front door D1 and a rear door D2. In the case of a two-door sedan or a two-door coupe, only the front door D1 and the front door opening B2 are provided, and the rear door D2 and the rear door opening B3 are not provided. The front door D1 of this embodiment is disposed so as to correspond to the front door opening B2, and the rear door D2 is disposed so as to correspond to the rear door opening B3. The side door D including the front door D1 and the rear door D2 in the present embodiment corresponds to an example of the side door according to the present invention. In the case of the above-described two-door sedan or two-door coupe, the front door D1 is the side door according to the present invention. It corresponds to an example.

  As shown in FIGS. 2B and 2D, the front door D1 is provided with hinges H1 at two upper and lower positions on the front end portion (the front side of the vehicle body B). Further, as shown in FIGS. 2C and 2E, the rear door D2 is provided with hinges H2 at two upper and lower positions on the front end (the front side of the vehicle body B). Although the hinges H1 and H2 for mounting the front door D1 and the rear door D2 to the body shell B1 so as to be freely opened and closed are slightly different in shape, the basic structure is the same. The hinge H1 is shown, and the other hinge H2 is not shown by attaching a corresponding symbol in parentheses.

  As shown in FIG. 2F, the hinge H1 has two hinge brackets H11 and H12 and a hinge pin H13. The hinge bracket H11 is attached to the inner panel of the front door D1 via a bolt (not shown), and the hinge bracket H12 is attached to the front pillar B4 of the body shell main body B1 via a bolt (not shown). The hinge pin H13 is inserted into the four holes of the two hinge brackets H11 and 12, and is fixed by caulking or press-fitting. Accordingly, the hinge brackets H11 and H12 are coupled so as to be rotatable around the hinge pin H13.

  In the vehicle body assembly line WL, the hinge pin H13 is inserted into the four holes of the two hinge brackets H11 and 12, and the subassembly parts of the hinge H1 fixed by caulking or press-fitting are assembled in advance, and this is carried into the final process. . Before mounting the front door D1 on the body shell main body B1, one of the hinge brackets H11 of the subassembly parts of the hinge H1 is bolted to the front door D1, and then the front door D1 is connected to the front door of the body shell main body B1. The opening B2 is set using a jig or the like, and the other hinge bracket H12 is bolted to the front pillar B4. Thereby, the front door D1 can be opened and closed by rotating around the hinge pin H13.

  Similarly, the hinge H2 has two hinge brackets H21 and H22 and a hinge pin H23 as indicated by the reference numerals in parentheses in FIG. 2F. The hinge bracket H21 is attached to the rear door D2 via a bolt (not shown), and the hinge bracket H22 is attached to the center pillar B14 of the body shell main body B1 via a bolt (not shown). The hinge pin H23 is inserted into the holes of the two hinge brackets H21 and 22 and fixed by caulking or press-fitting. Accordingly, the hinge brackets H21 and H22 are coupled so as to be rotatable around the hinge pin H23. That is, the rear door D2 can be opened and closed by rotating around the hinge pin H23. Hereinafter, the hinge H1 and the hinge H2 are collectively referred to as a hinge H.

  In the automobile body B of the present embodiment, as shown in FIGS. 2D, 2E, and 2G, narrow portions N1 and N2 having a narrow interval are formed between the body shell main body B1 and the side door D. Specifically, as shown in FIGS. 2D and 2G, a narrow portion N1 having a narrow interval is formed in the vicinity of the hinge H1 between the front pillar B4 of the body shell main body B1 and the front door D1, as shown in FIG. 2E. As shown, a narrowed portion N2 having a narrow interval is formed in the vicinity of the center pillar B5 of the body shell main body B1 and the hinge H2 between the rear door D2. In particular, in the vicinity of the hinges H1 and H2, regardless of whether the front door D1 or the rear door D2 is opened or closed, the hinges H1 and H2 are obstructed and hot air from the paint drying apparatus 1 is difficult to enter. It is harder to heat than the outer plate part. Accordingly, it is difficult to maintain a predetermined temperature, which is a quality assurance standard for the coating film, for a predetermined time or longer. 2D and 2E indicate the range of top coating, and the symbol WS similarly indicates the side door D1 for sealing between the side doors D1, D2 and the door openings B2, B3. , D2 is a weather strip to be mounted. In particular, the coating range from the weather strip WS to the outdoor side is severe with respect to the rust environment, and is a part that requires coating quality such as adhesion of the coating film in addition to the quality of appearance.

  Returning to FIG. 2A, the automobile body B described above is transported from the electrodeposition drying process P13 to the coating completion inspection process P6 in FIGS. 1A and 1B while being mounted on the painting carriage 50. The painting cart 50 of the present embodiment is a rectangular frame in plan view, and is composed of a base 51 made of a rigid body capable of supporting the automobile body B, and four provided on the lower surface of the base 51. It has a wheel 54, two front attachments 52 and two rear attachments 53 provided on the upper surface of the base 51. The left and right front attachments 52 respectively support the left and right front under bodies B6 (front side members and the like) of the automobile body B, and the left and right rear attachments 53 are the left and right rear under bodies B7 (rear side members and the like) of the automobile body B. Support each. The automobile body B is horizontally supported by these four attachments 52 and 53. The four wheels 54 rotate along the rails 41 laid on the left and right sides of the transport conveyor 40. In addition, although mentioned later for details, in this embodiment, when conveying the inside of the top coat drying apparatus 1, the motor vehicle body B is conveyed back. That is, in the mounted state shown in FIG. 2A, the coating carriage 50 and the automobile body B are conveyed toward the right.

  Next, the top coat drying apparatus 1 of this embodiment is demonstrated. 3 is a side view showing a schematic configuration of the top coat drying apparatus according to one embodiment of the present invention, FIG. 4A is a cross-sectional view taken along line 4A-4A in FIG. 3, and FIG. 4B is 4B- in FIG. It is sectional drawing which follows the 4B line.

  As shown in FIGS. 3, 4 </ b> A, and 4 </ b> B, the topcoat drying apparatus 1 of the present embodiment includes a drying furnace body 10, a hot air supply device 20, and an exhaust device 30. As shown in the side view of FIG. 3, the drying furnace body 10 of the present embodiment includes an ascending inclined portion 11 on the inlet side, a descending inclined portion 13 on the exit side, and an ascending inclined portion 11 and a descending inclined portion 13. It is a drying furnace having a mountain shape including a raised floor portion 12 therebetween. 4A and 4B, the drying furnace has a rectangular shape having a ceiling surface 14, a pair of left and right side surfaces 15 and 15, and a floor surface 16. In the side view of FIG. 3, the right side is the top coating setting zone at the end of the top coat booth and the inlet side of the drying furnace body 10, the left side is the outlet side of the drying furnace body 10, and the vehicle body B mounted on the coating carriage 50 is 3 is conveyed backward from the right to the left in FIG. That is, the automobile body B transported in the top coat drying apparatus 1 of the present embodiment is transported in the right direction shown in FIG. 2A. However, since the automobile body B only needs to be transported backwards at least in the top coat drying apparatus 1, the automobile body B is directed forward by providing a direction changing device such as a turntable in the steps before and after that. You may convey to.

  The furnace width of the rising slope portion 11 and the raised floor portion 12 on the inlet side of the drying furnace body 10 is such that the side door D does not interfere with the air supply duct 24 even if the side door D of the automobile body B is conveyed in an open state. The width is assumed. The height of the floor surface 16 of the raised floor 12 of the drying furnace body 10 is substantially the same as the height of the upper opening edge of the opening of the drying furnace body 10 and the upper edge of the opening of the outlet of the drying furnace body 10. Has been. Thereby, it can suppress that the hot air supplied to the high floor part 12 escapes from the entrance or exit to the drying furnace main body 10 outside. In addition, on the floor surface 16 of the drying furnace body 10, a transfer conveyor 40 is laid along the extending direction of the drying furnace body 10 to transfer the painting carriage 50 on which the automobile body B is mounted. The laying configuration of the transfer conveyor 40 in the high floor portion 12 of this embodiment will be described later.

  The hot air supply device 20 is a facility for supplying the generated hot air into the raised floor portion 12 of the drying furnace body 10, and as shown in FIGS. 4A and 4B, an air supply fan 21, an air supply filter 22, A burner 23, an air supply duct 24, a first hot air outlet 25, and a second hot air outlet 26 are provided. The air supply fan 21 is a facility for supplying air sucked from the outside to the inside of the raised floor portion 12 of the drying furnace body 10. The air supply filter 22 is connected to the primary side (air intake side) of the air supply fan 21, filters the air intake from the outside, and separates dust and the like. Thereby, clean air is sucked into the air supply fan 21. The burner 23 is connected to the secondary side (air discharge side) of the air supply fan 21 and heats the air discharged from the air supply fan 21 to a predetermined temperature. Thereby, the sucked air is supplied as hot air into the raised floor 12 of the drying furnace body 10.

  As shown in FIGS. 4A and 4B, the air supply duct 24 is disposed on the ceiling surface 14 and the left and right side surfaces 15, 15 of the high floor portion 12 of the drying furnace body 10 along the conveyance direction of the automobile body B, respectively. . The first hot air outlet 25 and the second hot air outlet 26 are rectangular slits (a plurality of rectangular slits) formed at predetermined intervals along the extending direction of the air supply duct 24 disposed in the raised floor portion 12 of the drying furnace body 10. Opening) and, if necessary, a wind direction plate provided in the slit. The first hot air outlet 25 and the second hot air outlet 26 are provided so that the opening of each slit or the wind direction plate is directed to the center of the drying furnace body 10 or a predetermined portion (the narrow portions N1 and N2 described above). Thereby, the hot air supplied by the air supply fan 21 is blown to a predetermined portion of the automobile body B that is transported in the drying furnace body 10.

  As shown in FIG. 4A, the raised floor 12 of the drying furnace body 10 of the present embodiment includes a region X1 in which the first hot air outlet 25 and the second hot air outlet 26 are provided, and a first heat as shown in FIG. 4B. It is partitioned in the extending direction (conveying direction) into regions X2 and X3 where only the air outlet 25 is provided. The form of the section will be described later. In addition, as shown to FIG. 4A, the supply duct 24 of the area | region X1 in which the 1st hot air blower outlet 25 and the 2nd hot air blower outlet 26 were provided, and only the 1st hot air blower outlet 25 as shown in FIG. 4B are provided. The air ducts 24 in the areas X2 and X3 are insulated, and the air supply fan 21, the air supply filter 22, and the burner 23 are respectively provided, and the temperature of the hot air supplied to each of the insulated areas X1, X2, and X3 And the flow rate may be controlled.

  As shown in FIGS. 4A and 4B, the exhaust device 30 is a facility for discharging the solvent evaporated in the drying furnace body 10 to the outside of the system, and includes an exhaust fan 31, an exhaust filter 32, an exhaust duct 33, And an exhaust suction port 34. The exhaust fan 31 is a device that sucks the hot air in the drying furnace body 10 and discharges it outside the system of the drying furnace body 10 or circulates it to the primary side of the hot air supply device 20. Controls the function of removing hot air pressure and adjusting hot air pressure. The exhaust filter 32 is provided on the secondary side (the side from which hot air is discharged) of the exhaust fan 31. Hot air is sucked by the exhaust fan 31, passes through the exhaust filter 32, is discharged outside the system, or returned to the hot air supply device 20. The exhaust duct 33 is provided on each of the left and right side surfaces 15 and 15 of the drying furnace body 10 along the conveyance direction of the automobile body B. The exhaust suction port 34 includes slits formed at predetermined intervals in the exhaust duct 33 disposed in the drying furnace body 10.

  As shown in FIG. 3, the conveyor 40 laid on the drying furnace main body 10 of the present embodiment is along the floor surface 16 of the upward inclined portion 11 in the upward inclined portion 11 on the inlet side of the drying furnace main body 10. In the downward inclined portion 13 on the outlet side of the drying furnace main body 10, the downward inclined portion 13 is inclined downward along the floor surface 16 of the downward inclined portion 13. However, in the high floor portion 12 of the drying furnace main body 10, it is not laid horizontally along the floor surface 16 (disposed horizontally) of the high floor portion 12, and as shown in FIG. In order from the side, they are laid so as to have an upward slope 42, a horizontal 43, and a downward slope 44. That is, in the region X1 where the conveyor 40 laid on the high floor portion 12 is laid so as to have an upward slope 42, the automobile body B mounted horizontally with respect to the painting carriage 50 is in a posture that rises backward. In the region X2 where the conveyor 40 laid on the high floor portion 12 is laid horizontally 43, the vehicle body B mounted horizontally with respect to the painting carriage 50 is in a horizontal posture, and the high floor portion In the region X3 in which the conveyor 40 laid on 12 is laid so as to have a downward slope 44, the vehicle body B mounted horizontally with respect to the coating carriage 50 is in a downwardly lowered posture.

  As shown in FIG. 2A, when the automobile body B is mounted horizontally with respect to the painting carriage 50, the hinge pins H13, H13 (or H23) of the upper and lower hinges H1, H1 (or H2, H2) shown in FIGS. , H23) is a vertical line. Therefore, the front door D1 (or the rear door D2) does not rotate because a rotation moment due to its own weight with the hinge pin as the rotation center does not work. On the other hand, when the posture of the automobile body B is raised backward, the straight line connecting the hinge pins H13, H13 (or H23, H23) of the upper and lower hinges H1, H1 (or H2, H2) is inclined with respect to the vertical direction. The front door D1 (or the rear door D2) is subjected to a rotational moment due to its own weight with the hinge pin as the rotation center. Accordingly, the front door D1 (or the rear door D2) is automatically opened to the opening limit due to its own weight. Further, by the same action, when the posture of the automobile body B is lowered rearward, the front door D1 (or the rear door D2) is automatically closed to the closing limit by its own weight.

  In the top coat drying apparatus 1 of this embodiment, the side door D is automatically opened using the automatic opening / closing operation of the side door D, and hot air is concentrated and sprayed on the narrow portions N1 and N2 described above. The side door D is automatically closed. That is, as shown in FIG. 3, the front door D1 and the rear door D2 that are side doors D with respect to the automobile body B are set in an unfixed state, and are conveyed rearward in this state. As a result, in the ascending inclined portion 11 on the entrance side, the side door D that has been closed until then is automatically fully opened, and further, the region X1 of the high floor portion 12 where the conveyor conveyer 40 is inclined upward 42. In, the fully open state of the side door D is maintained. And the 1st hot air blower outlet 25 and the 2nd hot air blower outlet 26 which are shown to FIG. 4A are provided in the area | region X1 where this side door D is fully opened. However, in this region X, only the second hot air outlet 26 shown in FIG. 4A may be provided, and the first hot air outlet 25 may be omitted.

  As shown in FIG. 4A, the second hot air outlet 26 is provided above and below the air supply ducts 24, 24 on the left and right side surfaces 15, 15 of the drying furnace body 10. You may comprise the 2nd hot air blower outlet 26 including the guide part which is a kind of wind direction board in the front-end | tip. The second hot air outlet 26 provided on the upper side opens upstream and obliquely downward, and the second hot air outlet 26 provided on the lower side opens upstream and obliquely upward. doing. As a result, the second hot air outlet 26 has a narrow portion N1 near the hinge H where the side door D is attached to the body shell body B1 when the vehicle body B passes in front of the second hot air outlet 26. The opening is directed toward N2.

  By opening the second hot air outlet 26 toward the upstream side, it becomes easy to blow hot air toward the vicinity of the hinge H of the automobile body B conveyed with the side door D opened. Further, since the second hot air outlet 26 is provided above and below the side surfaces 15, 15, hot air from the second hot air outlet 26 provided above is mainly blown to the upper side near the hinge H, Since the hot air from the second hot air outlet 26 provided below is mainly blown to the lower side near the hinge H, the narrow portions N1 and N2 near the hinge H can be uniformly dried.

  Although not particularly limited, it is preferable that the amount of heat of the hot air blown from the second hot air outlet 26 is set larger than the amount of hot air blown from the first hot air outlet 25. In the present embodiment, the hot air blown from the second hot air outlet 26 is set by making the wind speed of the hot air blown from the second hot air outlet 26 larger than the wind speed of the hot air blown from the first hot air outlet 25. The amount of heat is set large. Specifically, the wind speed of the hot air blown from the first hot air outlet 25 shown in FIGS. 4A and 4B is around 3 m / s in the vicinity of the painted surface of the outer plate portion of the automobile body B, whereas It is desirable to set the wind speed of the hot air blown out from the two hot air outlets 26 at around 10 m / s.

  Note that, in the region X1 of the high floor portion 12 where the conveyor 40 is inclined upward 42, it also serves as the temperature raising zone of the drying furnace body 10, and therefore the first heat is supplied to the air supply duct 24 provided on the ceiling surface 14. It is desirable to provide a wind outlet 25.

  As shown in FIG. 3, an area X <b> 2 in which the transport conveyor 40 is a horizontal 43 is provided on the downstream side of the area X <b> 1 in which the transport conveyor 40 has an upward slope 42 in the high floor portion 12. Further, on the downstream side of the region X2, a region X3 in which the conveyor 40 is inclined downward 44 is continuously provided. As described above, in the area X1 of the raised floor portion 12 where the conveyor 40 is inclined upward 42, hot air is blown while the side door D is maintained in its fully open state by its own weight, but passes through the area X2 and the area X3. When doing so, the posture of the automobile body B gradually changes from the rearwardly raised posture to the backwardly lowered posture. As a result, the side door D that has been fully opened until then is gradually closed to the closing limit by its own weight. And when the vehicle body B passes the downward inclined part 13 of the exit of the drying furnace main body 10, the state where the side door D is fully closed is maintained. When the side door D is closed to the closing limit, the door inner panel or the door sash hits the door openings B2 and B3 of the body shell main body B1, and either of them is deformed or scratched. For this reason, it is desirable to attach the door stopper jig 60 shown in FIGS. 7A and 7B to the automobile body B in a step before being carried into the top coat drying apparatus 1. The door stopper jig 60 shown in FIGS. 7A and 7B is attached to the hole B91 and the flange B92 of the side sill B9 so that the side door D contacts the part hidden by the fitting parts of the door inner panel so that it does not close to the closing limit. It is a jig.

  As shown in FIG. 4B, air supply provided on the ceiling surface 14 and the side surface 15 in the region X2 where the conveyor 40 is horizontal 43 and the region X3 where the conveyor 40 is inclined downward 44 It is desirable to provide only the first hot air outlet 25 in the duct 24. The first hot air outlets 25 provided on the left and right side surfaces 15 and 15 are arranged such that the front fender B11, the side door D, and the rear fender of the automobile body B when the automobile body B passes in front of the first hot air outlet 25. An opening or a wind direction plate is directed toward the outer plate portion of B12. In addition, the first hot air outlet 25 provided on the ceiling surface 14 has a hood F, a roof B13, and a trunk lid T of the automobile body B when the automobile body B passes in front of the first hot air outlet 25. An opening or a wind direction plate is provided toward the outer plate portion. Hot air is blown over the entire automobile body B through the first hot air outlet 25 to maintain the temperature of the entire automobile body B including the outer plate portion.

  FIG. 5 is a side view showing a schematic configuration of a top coat drying apparatus according to another embodiment of the present invention, and FIG. 6 shows a schematic configuration of a top coat drying apparatus according to still another embodiment of the present invention. It is a side view. 5 and 6, the cross section taken along line 4A-4A is the same as the structure shown in FIG. 4A, and the cross section taken along line 4B-4B is made the same structure as the structure shown in FIG. 4B. Yes. In the above-described topcoat drying apparatus 1 shown in FIG. 3, in order from the upstream side of the high floor portion 12, the region X <b> 1 in which the transport conveyor 40 has an upward slope 42, the region X <b> 2 in which the transport conveyor 40 has a horizontal 43, Although the region X3 in which the conveyor 40 is inclined downward 44 is provided, the coating drying apparatus of the present invention is provided with X1 in which the conveyor 40 is inclined upward 42 at least on the upstream side of the raised floor 12. Just do it.

  For example, the top coat drying apparatus 1 according to another embodiment shown in FIG. 5 omits the region X2 in which the transport conveyor 40 is made horizontal 43, and continues to the region X1 in which the transport conveyor 40 has an upward slope 42. This is an example in which the conveyor 40 is provided with a region X3 having a downward slope 44. In addition, the top coat drying apparatus 1 according to still another embodiment shown in FIG. 6 omits the region X2 where the transport conveyor 40 is horizontal 43 and the region X3 where the transport conveyor 40 is inclined downward 44. This is an example in which the entire area is defined as an area X1 in which the conveyor 40 is inclined upward 42. The top coating / drying apparatus 1 of another embodiment as described above can also automatically open and close the side door D, similarly to the top coating / drying apparatus 1 shown in FIG.

  Moreover, in each embodiment shown in FIG.3, FIG5 and FIG.6 mentioned above, although the attitude | position of the motor vehicle body B is changed with the inclination-angle of the conveyance conveyor 40 laid in the high floor part 12 of the drying furnace main body 10, The conveyor 40 to be laid is installed horizontally, and the left and right front attachments 52 and 52 and / or the left and right rear attachments 53 and 53 of the painting carriage 50 shown in FIG. It is good. That is, when the vehicle body B is in a rearward raising posture, the left and right front attachments 52 are lowered synchronously, the left and right rear attachments 53 are synchronously raised, or both of these operations are performed on the high floor portion. 12 may be executed on the upstream side. Further, when the vehicle body B is in a rearwardly lowered posture, the left and right front attachments 52 are raised synchronously or the left and right rear attachments 53 are lowered synchronously, or both of these operations are performed. It suffices to execute it on the downstream side.

According to the top coat drying apparatus 1 and the top coat drying method of the present embodiment, the following operational effects are obtained.
Due to its structure, the automobile body B is mostly configured to include a part that is easily hit by hot air and a part that is hard to hit. For example, even if the narrow portions N1 and N2 in the vicinity of the hinges H1 and H2 of the side door D are flowed to the top coat drying apparatus 1 with the side door D closed, it is difficult for hot air to enter and the temperature to rise. On the other hand, the outer plate portion such as the outer panel of the side door D is likely to be directly blown with hot air and easily heated. For this reason, if the setting conditions such as hot air temperature and passage time of the top coat drying device 1 are matched with the narrow portions N1 and N2 where it is difficult to raise the temperature, the outer plate portion that is likely to be heated rises far beyond the quality assurance standards and is wasted. Not only is a large amount of energy consumed, but in some cases, overbaking may occur and the coating quality may be deteriorated. However, when the setting conditions such as hot air temperature and passage time of the top coat drying device 1 are matched to the outer plate part where the temperature rises easily, the drying conditions of the coating film of the narrow parts N1 and N2 do not meet the quality assurance standards. In other words, so-called baking sweetness is produced, and there is a possibility that the performance of the coating film deteriorates or the coating film peels off. In the present embodiment, in the region X1 transported with the side door D opened, the hot air is locally blown toward the narrow portions N1 and N2 that are relatively difficult to raise the temperature, whereby the coating film of the automobile body B Uniform drying conditions over the entire area can be achieved, and not only coating film quality but also energy saving can be realized.

(1) That is, according to the embodiment shown in FIGS. 3, 5, and 6, the side door D is automatically opened by its own weight when the automobile body B passes through the upward inclined portion 11 at the entrance of the drying furnace body 10. Further, in at least the upstream region X1 of the raised floor portion 12, the automobile body B is conveyed in a rearwardly rising posture, so that the side door D is kept open. Then, at least in the upstream region of the high floor portion 12, hot air is blown locally toward the body shell body B1 in the vicinity of the hinges H1 and H2 and the wet coating applied to the side door D with the side door D open. Thus, predetermined drying conditions can be satisfied. Furthermore, in the downward inclination part 13 of the exit of the drying furnace main body 10 subsequent to this, since the side door D is automatically closed by its own weight, it is necessary to provide a dedicated device for opening and closing the side door D over the entire drying furnace main body 10. Absent.

(2) Further, according to the embodiment shown in FIGS. 3 and 5, the automobile body B is conveyed in a downwardly lowered posture with respect to the horizontal in the downstream region X3 of the raised floor portion 12. The side door D closes slowly and automatically.

(3) Further, according to the embodiment shown in FIGS. 3 and 5, the posture is gradually changed from the upwardly rising posture of the upstream region X1 of the high floor portion 12 to the downwardly downward posture of the downstream region X3, or horizontally for a predetermined time. If the inclination angle of the conveyor or the operation of the support portion of the painting carriage is set so as to maintain the posture (see region X2 in FIG. 3), the side door D can be prevented from strongly colliding with the body shell body B1, and the coating film Occurrence of hitting scratches and panel dents can be suppressed.

  The hot air supply device 20 corresponds to the hot air generation and supply means of the present invention, and the region X1 in which the conveyor 40 is inclined upward corresponds to the local drying region of the present invention.

PRL ... Press molding line WL ... Car body assembly (welding) line ASL ... Vehicle assembly (fitting) line PL ... Paint line P1 ... Undercoat process (electrodeposition process)
P11 ... Electrodeposition pretreatment process P12 ... Electrodeposition coating process P13 ... Electrodeposition drying process P2 ... Sealing process P3 ... Intermediate coating process P31 ... Intermediate coating process P32 ... Intermediate coating drying process P4 ... Water research process P41 ... Water research drying Process P5 ... Top coat process P51 ... Top coat coating process P52 ... Top coat drying process P6 ... Coating finish inspection process P7 ... Intermediate coating / top coating process P71 ... Intermediate coating / top coating coating process P72 ... Intermediate coating / top coating drying process D / L ... Drop lifter B ... Body shell
B1 ... Body shell body B2 ... Front door opening B3 ... Rear door opening B4 ... Front pillar B5 ... Center pillar B6 ... Front underbody B7 ... Rear underbody B8 ... Roof side rail B9 ... Side sill B10 ... Rear pillar B11 ... Front fender B12 ... rear fender B13 ... roof F ... hood T ... trunk lid D ... side door D1 ... front door H1 (H) ... hinge H11, H12 ... hinge bracket H13 ... hinge pin D2 ... rear door H2 (H) ... hinge H21, H22 ... hinge bracket H23 ... Hinge pins N1, N2 ... Narrow part 1 ... Top coat drying apparatus 10 ... Drying furnace body 11 ... Upward inclined part 12 on entrance side 12 ... High floor part 13 ... Downward inclined part on outlet side 14 ... Ceiling surface 15 ... Side surface 16 ... Floor Surface 20 ... Hot air supply device 21 ... Air supply fan 22 ... Air supply filter 23 ... Burner 24 ... Air supply duct 25 ... First hot air outlet 26 ... Second hot air outlet 30 ... Exhaust device 31 ... Exhaust fan 32 ... Exhaust filter 33 ... Exhaust duct 34 ... Exhaust air inlet X1... Region X2 where the transfer conveyor is inclined upwards... Region X3 where the transfer conveyor is horizontal... Region where the transfer conveyor is inclined downward. ... Down slope 50 ... Painting truck 51 ... Base 52 ... Front attachment 53 ... Rear attachment 54 ... Wheel 60 ... Door stopper jig

Claims (11)

A coating drying apparatus for drying a wet coating applied to an automobile body while conveying the automobile body having a side door attached to the body shell body via a hinge backwards, and a mountain-shaped drying furnace body and In the paint drying apparatus comprising hot air generation and supply means for supplying hot air into the drying furnace body,
The drying furnace main body includes an ascending inclined part on the inlet side, a descending inclined part on the outlet side, and a raised floor part between the ascending inclined part and the descending inclined part,
The automobile body is transported in a posture that rises backward with respect to the horizontal in at least the upstream region of the raised floor portion,
The coating drying apparatus provided with the local drying area | region which blows a hot air toward the wet coating film applied to the body shell main body and the side door in the vicinity of the hinge in the upstream area.   The paint drying apparatus according to claim 1, wherein the automobile body is transported in a downwardly lowered posture with respect to the horizontal in a downstream region of the raised floor portion.   The paint drying apparatus according to claim 2, wherein the automobile body is transported in a horizontal posture for a predetermined time before being transported in the back-up posture after being transported in the back-up posture. A coating drying apparatus for drying a wet coating applied to an automobile body while conveying the automobile body having a side door attached to the body shell body via a hinge backwards, and a mountain-shaped drying furnace body and In the coating drying apparatus comprising hot air generation and supply means for supplying hot air into the drying furnace body,
The drying furnace main body includes an ascending inclined part on the inlet side, a descending inclined part on the outlet side, and a raised floor part between the ascending inclined part and the descending inclined part,
The conveyor of the high floor portion is laid so as to be inclined upward with respect to the horizontal in at least the upstream region of the high floor portion,
The coating drying apparatus provided with the local drying area | region which blows a hot air toward the wet coating film applied to the body shell main body and the side door in the vicinity of the hinge in the upstream area.   The paint drying apparatus according to claim 4, wherein the conveyor is laid so as to be inclined downward with respect to the horizontal in a downstream region of the raised floor portion.   The paint drying apparatus according to claim 5, wherein the conveyor is laid so as to be horizontal by a predetermined distance between an upstream region and a downstream region of the raised floor portion. In the upstream area of the high floor part, together with the local drying area, a temperature raising area is provided for raising the temperature of the automobile body by blowing hot air over the entire automobile body,
The coating and drying apparatus according to any one of claims 1 to 6, wherein a temperature holding region that holds the temperature of the automobile body by blowing hot air over the entire automobile body is provided in a downstream area of the raised floor portion. . A mountain-shaped drying furnace main body including an ascending inclined part on the inlet side, a descending inclined part on the outlet side, and a raised floor part between the ascending inclined part and the descending inclined part, and hot air in the drying furnace body Using a coating drying device comprising hot air generation and supply means for supplying,
A coating drying method for drying a wet paint film applied to the automobile body while conveying the automobile body with a side door attached to the body shell body through a hinge backwards,
At least in the upstream region of the high floor portion, the vehicle body is transported in a posture that rises backward relative to the horizontal,
A coating and drying method in which hot air is locally blown toward the wet coating applied to the body shell body and the side door in the vicinity of the hinge in the upstream region.   The paint drying method according to claim 8, wherein in the downstream area of the high floor portion, the automobile body is transported in a posture of lowering backward with respect to the horizontal.   The paint drying method according to claim 9, wherein the automobile body is transported in a horizontal posture for a predetermined time before being transported in the rear-up posture after being transported in the rear-up posture. In the upstream region of the raised floor portion, while blowing hot air locally, blowing hot air over the entire automobile body to raise the temperature of the automobile body,
The paint drying method according to any one of claims 8 to 10, wherein hot air is blown over the entire automobile body to maintain the temperature of the automobile body in a downstream region of the raised floor portion.

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