JP2517590B2 - Jig for car body rotation in painting line - Google Patents

Description

TECHNICAL FIELD The present invention relates to a jig for rotating an automobile body in a painting line.

(Prior art and its problems) When coating an automobile body as an object to be coated, a preparatory step of removing dust adhering to the body, a step of applying a paint to the body, and a drying of the applied paint And a drying step.

Then, the body normally undergoes the above-mentioned preparation process, coating process, and drying process while being transported by a transport carriage, but the posture of the body is maintained while maintaining a predetermined posture in each process.

(Problems to be Solved by the Invention) By the way, recently, in a coating line of an automobile body, there is a demand to rotate the automobile body in order to perform a novel coating method. That is, in the coating process, the coating is applied to a thickness not less than the sagging limit, and by rotating the object to be coated around the horizontal axis in the next drying process, the smoothness can be further improved if the coating film has the same thickness. This will result in a high quality painted surface which will require rotation of the body when performing such drying methods.

As described above, when the automobile body is rotationally driven, it is necessary to rotatably support the automobile body. For this reason, a rotation jig is attached to the automobile body, and the rotation shaft portion formed on the rotation jig, that is, the supported portion that serves as the rotation center of the automobile body,
For example, it is conceivable that the carrier vehicle is supported by the bearings formed.

When the automobile body is rotated using this rotating jig, how to secure the strength of the joint between the rotating jig and the automobile body becomes a problem. In particular, the car body is quite heavy, and the car body is composed by combining and joining a number of thin panels. At this point, the car body may be locally deformed.

Therefore, it is conceivable to previously join the reinforcing member to the automobile body at a position where the rotating jig is attached, but in this case, a separate reinforcing member is required, which is not a good idea.

Therefore, an object of the present invention is to provide an automobile body in a painting line in which a rotating jig can be firmly attached to the automobile body without special reinforcement for preventing deformation of the automobile body. To provide a jig for rotation.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, a coating step of applying a paint on the surface of an automobile body as an object to be coated to a thickness equal to or more than the sagging limit, and after the coating step, drying the applied paint while rotating the automobile body around a substantially horizontal axis, Moreover, the rotation at this time is started before the paint sags due to gravity,
And a drying process that is performed at a rotation speed such that the surface of the automobile body shifts from a substantially vertical state to a substantially horizontal state before the paint sags of the applied paint due to gravity. A rotating jig used to rotate an automobile body, which has a rotating shaft portion as a supported portion that serves as a rotation center of the automobile body and a mounting portion for the automobile body, and is formed on the automobile body. It is configured such that the mounting portion is mounted to the existing foot part mounting portion or a portion having excellent strength located in the vicinity thereof.

That is, in the automobile body, a suspension tower portion to which the upper end portion of the shock absorber as an undercarriage component is attached,
Alternatively, there is a portion having excellent strength, such as a frame to which the suspension arm is attached (a floor frame, a front frame, a rear frame, or the like, which may have different names depending on their positions). Therefore, by attaching the mounting portion of the rotating jig to the portion excellent in strength, the weight of the automobile body during rotation can be reduced by the above-mentioned strength portion without taking special reinforcement measures for the automobile body. You can take it firmly with.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

Here, in the example, in order to improve the smoothness of the coated surface obtained with the same coating film thickness, in the spraying of the coating material in the coating process, the coating film thickness should be equal to or more than the sagging limit. In the drying process, the body is rotated around the horizontal axis. The present invention is applied to the rotation of the body about the horizontal axis.

Explaining the above points, first, there is smoothness (flatness) as one criterion for evaluating the quality of a coated surface. The higher the smoothness, the smaller the degree of unevenness of the coated surface, and the better the coated surface. Becomes To improve the smoothness of this painted surface,
It is already known that the thickness of the coating film, that is, the film thickness of the applied coating material may be increased.

On the other hand, there is "drip" of the paint that hinders the quality of the painted surface. This dripping occurs when the applied paint flows downward due to gravity and causes 1
The larger the film thickness of the paint applied each time is, the more likely it is to cause "sag". The cause of this "sag" is, after all, the effect of gravity, so it occurs on the vertically extending surface of the body, that is, on the so-called vertical surface. It will be easy.

Therefore, the horizontally extending surface of the body, that is, the so-called lateral surface, in which the "drip" of the paint is not a serious problem, can make the thickness of the applied coating larger than that of the vertical surface. Even if the thickness of the coating film on the horizontal surface is the same as the thickness of the coating film on the vertical surface, the unevenness is reduced by the slight flow of the paint that does not cause sagging on the horizontal surface, resulting in smoothness on the vertical surface. The smoothness is better than the degree.

In view of the above, conventionally, in order to obtain a painted surface with as large a smoothness as possible while preventing "sagging" of the paint, painting has been performed using a paint with as low fluidity as possible. The so-called "drip limit" in which "drip" of the paint occurs on the vertical surface is, for example, in the case of the thermosetting paint, the maximum thickness of the coating film is about 40 µm. More specifically, "drip" of the thermosetting coating is likely to occur in the initial setting process and the initial baking process, especially in the initial baking process, and is applied in the coating process so that "drip" does not occur at this time. The thickness of the paint is determined, and the maximum value of the determined thickness, that is, the sag limit value is about 40 μm. Therefore, in order to obtain a coated surface having even greater smoothness, it is necessary to repeat a series of processes from the coating process to the baking process a plurality of times in the conventional coating method, such as twice coating. was there.

However, since the direction of gravity acting on the paint applied to the body is changed by rotating the body in the horizontal direction by applying the amount above the sagging limit and subsequently rotating the body horizontally. , The paint will be dried without dripping.

Thereby, the film thickness of the coating material applied per time can be made much thicker than in the past, and a very good coated surface can be obtained in which the smoothness far exceeds the level which has hitherto been the limit.

Also, even when the thickness of the coating film is the same as the conventional one,
By utilizing the fluidity of the coating material, it is possible to obtain an excellent coated surface having a smaller unevenness, that is, a higher smoothness.

Furthermore, if it is intended to obtain a coated surface having the same smoothness, for example, the same smoothness as that obtained by a conventional coating method, the thickness of the paint to be applied can be made thinner than the conventional one, The amount of paint used can be reduced by the amount that can be made thinner.

Of course, paints that cause "sags" even with thin coatings
What is necessary is just to obtain from the conventional paint by reducing the component which obstructs fluidity by a predetermined ratio.

Overview of Overall FIG. 1 shows the overall steps of coating an automobile body W as an object to be coated, and each step is indicated by P1 to P4.

First, the body W, whose undercoating has been completed by known electrodeposition coating, is sent to the preparatory step P1 while being held by the carriage D. In this preparation step P1, dust inside and outside the body W is removed by, for example, air blow or vacuum suction. Next, in step P2, after the coating material (thermosetting coating material in the embodiment) is sprayed onto the body W, the coating material is dried in the setting step P3 and the baking step P4.

Dust Removal The dust removal in the process P1 may be performed while rotating the body W around the horizontal axis l, as shown in FIG. That is, for example, first, after the rotation of the body W is stopped in the state shown in FIG. 2A to remove dust, the posture of the body W is changed to the state shown in FIG. It stops at the position and the dust is removed again. In this way,
As shown in (c), (d), ... (i) of FIG. 2, dust is removed while the body W is intermittently rotated.

In this way, by removing dust while rotating the body W, for example, dust that adheres to the inner surface corners of the body W or the closed cross section of the side sill, that is, the body W must be rotated. It is possible to completely remove dust that does not fall.

The rotation range of the body W is 36 mm as shown in FIG.
The rotation may be 0 °, but in accordance with the rotation of the body W in the drying process described later, for example, the body W is rotated within a range of 180 ° (range between FIGS. 2 (a) and (e)), and the like. Can be one.

Spraying and drying of paint First, spraying of paint at P2 is performed so that the thickness of the coating film is equal to or greater than the sag limit. That is, in the conventional thermosetting paint that has been generally used, the maximum thickness of the paint that does not cause "sag", that is, the sag limit value is about 40 μm, but in the process P2, the sag limit of 40 μm is far exceeded. The paint is sprayed so as to form a thick coating film (for example, 65 μm).

After this P2, it will be immediately transferred to the setting process of P3. In this setting process P3, FIG.
As shown in (i), the body W is rotated in the horizontal direction. That is, the rotation axis l where the body W extends in the horizontal direction
, And in the embodiment, the rotation axis l
Extend in the front-rear direction of the body W. Although the temperature atmosphere in the setting step P3 is room temperature in the embodiment, it may be set to an appropriate temperature in a range lower than the temperature atmosphere in the subsequent baking step P4 such as 40 ° to 60 ° C. Of course, this setting step P3 is for volatilizing the low-boiling point component in the paint beforehand, which causes pinholes on the painted surface due to the rapid volatilization of the low-boiling point component in the next baking step P4. To be prevented.

In the baking process P4, the paint is baked in a temperature atmosphere of 140 ° C., for example. In this P4, as in the setting step of P3, the body W is rotated in the horizontal direction as shown in FIGS.

Due to the horizontal rotation of the body W at P3 and P4 described above, the paint is dried without dripping even if the paint is sprayed to a thickness greater than the sag limit at P2. As a result, a high-quality coated surface with extremely high smoothness, which cannot be obtained by the conventional coating method, can be obtained.

Relationship between coating thickness, sagging limit, smoothness, and horizontal rotation FIG. 3 shows the effect of the coating thickness on the sagging limit, focusing on the thermosetting coating material. FIG. 3 shows three cases of coating film thickness of 40 μm, 53 μm, and 65 μm. For both of these thicknesses, both at the beginning of the setting process and the beginning of the baking process,
It is understood that a "drip" peak occurs. In addition, the sag limit usually means a value when a sag of 1 to 2 mm is generated in one minute (a paint surface is defective if sag of 2 mm / min or more is visually observed). The maximum coating thickness obtained in the range is about 40 μm for the conventional paint.

On the other hand, FIG. 4 shows the influence on the smoothness when the body W is rotated in the horizontal direction and when it is not. A in FIG. 4 shows a state in which the body W is not rotated (conventional coating method). FIG. 4B shows a case where the body W is rotated by 90 ° and then reversed (forward and reverse rotation between FIGS. 2 (a) and (c)). FIG. 4C shows
The case where the body W is rotated by 135 ° and then reversely rotated (forward and reverse rotation between FIGS. 2 (a) and (d)) is shown. Fourth
FIG. D shows a case in which the body W is rotated 180 ° and then reversed (forward and reverse rotation between FIGS. 2 (a) and (e)). FIG. 4E shows a case where the body W is continuously rotated in the same direction (FIGS. 2 (a) and 2 (b)).
(C) ... (i), and then return to (a)).

As is apparent from FIG. 4, if the coating film has the same thickness, it is better to rotate the body W (see FIGS. 4B, C, D, and
E), the smoothness is larger than that when not rotated (FIG. 4A). Further, it is understood that it is preferable to rotate 360 ° in the same direction even in the same rotation in order to improve smoothness. Of course, when the body W does not rotate,
Since there is a limit to the thickness of the coating film, there is a limit to increasing the smoothness.

By the way, the thickness of the coating film is 65 μm and the body W is 360
When rotated by °, the obtained smoothness is the image clarity.
It is “87” in IG (lower limit of 1.0 in PGD value). When the thickness of the coating film is 40 μm, when the body W is not rotated, the IG is “58” (lower limit of 0.7 in PGD value), whereas the body W is rotated 360 °. If IG is "68"
(Lower limit of 0.8 in PGD value).

As is known, the IG (image gloss) in the image clarity indicates the ratio of the image clarity to the mirror surface (black glass) as 100, and the PGD indicates the reflection image identification degree of 1.0. Is a value in which the smoothness of the coated surface decreases as

The test conditions for the data shown in FIGS. 3 and 4 are as follows, and the test conditions show the conditions for performing overcoating with P2.

Paint: Melamine alkyd (black) Viscosity: Ford cup # 4 22 seconds / 20 ° C b. Coating machine: Minibell (16,000 rpm) shaping air…
Discharge rate: 2.0kg / cm ₂ c. Discharge rate: 2 times spraying, 1st time… 100cc / min 2nd time… 150 to 200cc / min d. Setting time: 10 minutes x room temperature e. Baking conditions: 140 ℃ × 25 minutes f. Substrate smoothness: 0.6 (PGD value) (intermediate coating, on PE tape) g. Rotation or reversal operating range: Setting (10 minutes) to baking (10 minutes) h. Coated object: 30 cm on each side Painted on the side surface of the rectangular cylinder of the, and rotatably supported at the center i. Rotation speed of the object to be coated: 3 rpm of 6 rpm, 30 rpm, 60 rpm, but there was virtually no difference due to the difference in rotation speed , When the coating is a two-component curing type that uses a main resin and a curing agent, sagging occurs only in the setting step P3, and when the coating is powder coating, sagging occurs only in the baking step P4. The rotation of W may be performed only in the setting step P3 in which this sagging occurs or only in the printing step P4. Further, in the case of powder coating, no setting process is necessary since it does not contain a solvent.

Rotating Jig Next, a specific example of a jig used to rotatably support the body W with respect to the carriage D in the horizontal direction will be described.

FIGS. 8 to 11 show an example of a case where the vehicle body W is attached to the suspension tower portion. As shown in FIGS. 8 and 9, this jig 1 has a pair of front and rear rotary shaft portions 2F and 2R, and a connecting portion 3 that connects both rotary shaft portions 2F and 2R. The two rotary shaft portions 2F and 2R are positioned on the same straight line, and the two rotary shaft portions 2F and 2R and the connecting portion 3 are formed as a partially bent and continuous rod shape. . A pair of front and rear arm portions 4F and 4R are integrally extended from the connecting portion 3. This arm section 4F
And 4R extend in a direction orthogonal to the connecting portion 3, and upwardly extending mounting portions 5FR, 5FL, 5RR, and 5RL project from the left and right ends thereof (hereinafter, when these mounting portions are collectively referred to as a reference numeral). 5 will be used). Each mounting part 5FR, 5FL, 5RL, 5RR
Corresponds to the positions of a total of four suspension tower parts 11FR, 11FL, 11RR, 1RL that are formed as shown in FIG. 9 (hereinafter, reference numeral 11 will be used when collectively referring to this suspension tower part). And).

The rotating jig configured as described above is shown in FIGS.
As shown in the figure, the vehicle body W is fitted with a pair of front and rear rotary shaft parts.
The mounting portion 5 is fixed to the suspension tower portion 11 while being disposed between 2F and 2R. That is, the mounting portion 5FR is fixed to the suspension tower portion 11FR,
Is fixed to 11FL, 5RR is fixed to 11RR, and 5RL is fixed to 11RL.

Details of the fixed state are shown in FIGS. 10 and 11 (see also FIG. 5). That is, FIG. 10 shows the state of attachment to the front suspension tower portions 11FR and 11FL, and in FIG. 10, 12 is the body W.
The frame (front frame), 13 is a wheel apron panel, and the suspension tower section 11 is integrally formed with the wheel apron panel 13.

Fig. 11 shows the rear suspension tower 11RR,
FIG. 11 shows a state of attachment to 11RL. In FIG. 11, a pair of left and right frames 12 (corresponding to a portion called a rear frame) are connected by a cross member 15 having a closed cross section joined to the lower surface of the floor panel 14. Has been done.
The suspension tower types 11RR and 11RL are formed integrally with the rear side panel 16.

The rotating jig 1 as described above is mounted on the mounting portion 5 with the top surface of the suspension tower portion 11 seated on the both surfaces.
The bolts 11 and 11 are integrated with the body W. In addition, the bolt (bolt hole) for this fixing
Is used as it is for fixing the upper end of the suspension shock absorber (a screw hole for this bolt is formed in the mounting portion 5). Figs. 12 to 15 are for rotation. The attachment portion 5 of the jig 1 is attached to a strength portion of the body W located near the portion to which the suspension arm is attached. The same components as those shown in FIGS. 8 to 11 are designated by the same reference numerals, and the description thereof will be omitted.

First, in the rotating jig 1, the left and right end portions of the arm portions 4F and 4R are used as attachment portions for the body W instead of the above-described attachment portions extending upward. That is, on the front end side of the body W, the arm portion 4F is widened in the front-rear direction, and the frame W is mounted on the left and right ends of the mounting portions 5FR and 5FL. Are bolted (see Fig. 14). In addition, this mounting position is
Almost compatible with the engine mounting position. Further, in the rear part of the body W, with the frame 12 and the cross member 14 seated on each of the left and right ends of the rear arm part 4R which is the mounting part of the jig 1, the mounting part is attached to the cross member 14.
5RR and 5RL are fixed by bolts.

When the jig 1 is attached to the body W, the front and rear rotating shaft portions 2F and 2R are positioned on the same straight line extending in the front-rear direction with the body W interposed therebetween.
This collinear line serves as the rotation axis l of the body W, and preferably the rotation axis l passes through the center of gravity G of the body W (see FIG. 5). Since the rotation axis l passes through the center of gravity G, when the body W rotates, large fluctuations in the rotation speed are prevented. As a result, it is possible to prevent the body W from being impacted by the rotation fluctuation, which is more preferable in terms of preventing sagging.

In addition, the front and rear jigs 1F and 1R are for vehicle type (type of body W)
Special items are prepared in advance according to the requirements.

Truck A truck having a function of rotating the body W.

In FIG. 5, the dolly D has a base 21, and the base 21
Wheels 22 attached to the vehicle run on a road surface (rail) 23. The base 21 includes one front pillar 24, two middle pillars 25 and 26, and one rear pillar that extends upward from the front side to the rear side (right side to left side in FIG. 5) in the transport direction. The support column 28 is provided, and the intermediate support column 26 and the rear support column 27 form a support space 28 that is largely spaced in the front-rear direction.

The body W to which the jig 1 is attached is disposed in the support space 28, the front portion of which is rotatably supported by the support column 27 using the rotating shaft portion 2F, while the rear portion thereof is the rotating shaft. Part 2R
It is rotatably supported by the column 26 by utilizing.

The front and rear rotary shafts 2F and 2R can be engaged with and disengaged from the columns 26 and 27 in the vertical direction, and the rotary shaft 2F is immovably engaged in the rotary axis 1 direction. For this reason, the pillar 26 is formed with a notch 26a that opens at the upper end surface thereof (first
6 to 18), the column 27 is formed with a notch 27a opening at the upper end surface thereof (see FIGS. 16, 20, and 21). The notches 26a and 27a are sized so that the rotary shaft portions 2F and 2R can be fitted to each other. And, while the flange portion 2a is formed on the rotary shaft portion 2F, the notch is formed on the column 27.
Notch 27b shaped to correspond to flange 2a communicating with 27a
Are formed. As a result, the rotating shaft portion 2R is
The notches 27a and 27b are engaged with and disengaged from the vertical direction, and are immovable in the axial direction with respect to the column 27 by the stopper action of the flange 2a. The rotational force is applied to the body W via the rotary shaft portion 2R, and therefore, a connecting portion 2b described later is formed at the tip end portion of the rotary shaft 2R.

A stay 29 projects downward from the base 21, and a pulling wire 30 is connected to a lower end portion of the stay 29. The wire 30 is of an endless type and is driven in one direction by a motor (not shown), which drives the carriage D in a predetermined transport direction. Of course, the motor is installed in a safe place from the viewpoint of explosion protection.

In the present embodiment, the rotation of the body W is performed by using the movement of the carriage D, that is, the displacement of the carriage D with respect to the traveling road surface 23. A rotation take-out mechanism 31 for taking out the displacement of the carriage D as a rotation is configured as follows. That is, the rotary take-out mechanism 31 includes a rotary shaft 32 which is vertically extended on the base 21 and is rotatably supported, a sprocket 33 fixed to a lower end of the rotary shaft 32, and a chain 34 meshed with the sprocket 33. ,,. The chain 34 is arranged in parallel with the wire 30 in a stationary state with respect to the traveling road surface 23. As a result, when the carriage D is pulled through the wire 30, the tune 34 does not move, so that the sprocket 33 that meshes with the chain 34, and thus the rotary shaft 32, rotates.

The transmission mechanism 35 for transmitting the rotation of the rotary shaft 32 to the rotary shaft portion 2R is configured as follows. That is, in the transmission mechanism 35, a casing 36 fixed to the rear surface of the front support column 24, a rotation speed 37 rotatably supported by the casing 36 in a lateral direction (front-back direction), and a rotation shaft
A pair of bevel gears 3 for interlocking 37 and the upper rotary shaft 32.
8 and 39, and a connecting shaft 40 held so as to be rotatable with respect to the support column 25 and slidable in the front-rear direction. The connecting shaft 40 is spline-connected to the rotating shaft 37 (this engaging portion is shown by reference numeral 41 in FIG. 5), and when the rotating shaft 32 is rotated by this, the connecting shaft 40 is also rotated. become. Of course, the rotary shaft 37 and the connecting shaft 40 are installed so as to be located on the rotary axis l.

The connecting shaft 40 is engaged with and disengaged from the rotary shaft portion 2R.
That is, as shown in FIGS. 16 to 18, a cross-shaped connecting portion 2b is formed at the tip of the rotating shaft portion 2R, while at the end of the connecting shaft 40, as shown in FIG. As shown in FIG. 19, a box portion 40a having an engaging recess 40c into which the connecting portion 2b is fitted without rattling is formed. Therefore, for example, by sliding the connecting shaft 40 through the rod 43 by a pneumatic cylinder 42 or manually, the box portion 40a (engagement recess 40c) and the connection portion 2b are disengaged and the engagement thereof is performed. At the same time, the connecting shaft 40 and the rotating shaft portion 2R can be integrally rotated. The rod 43 is fitted in an annular groove 40b formed on the outer periphery of the box portion 40a so as not to hinder the rotation of the connecting shaft 40, as shown in FIG.

With the above configuration, the body W is lowered with respect to the carriage D in a state where the connecting shaft 40 is displaced to the right in FIG.
It is supported rotatably and immovably in the front-back direction. After this, the connecting shaft 40 (locking recess 40c) becomes
Is engaged with (the connecting portion 2b thereof). Accordingly, when the carriage D is pulled through the wire 30, the body W is rotated about the predetermined horizontal axis l. The body W
The removal from the dolly D may be performed in the reverse order of the above procedure.

Further, since the attachment portions of the underbody parts are present at the front and rear end portions of the body W, the weight of the body W is reduced to the front and rear rotary shaft portions 2.
It can be distributed to F and 2R with good balance.

Supplementary Explanation and Modifications Next, supplementary explanations and modifications relating to the present invention will be sequentially described.

The switching of the rotation and the stop of the body W irrespective of the traveling and the stop of the bogie D and the switching of the change of the rotation direction can be performed by using a special actuator such as an air motor, for example. it can. First, in the example of FIG. 5, the sprocket 33 is provided with a pair of first and second chains (corresponding to the chain 34) that mesh with each other from the opposite sides in the radial direction, and each chain can be driven appropriately. I will do so. With such a configuration, the rotation of the body W is controlled according to the following driving mode.

The first chain is stopped and the second chain is free: In this case, the body W is rotated in one direction as the bogie D travels.

First chain free and second chain stop: In this case, the body W is rotated in the opposite direction as the carriage D travels.

Both chains are free: in this case, the body W is not rotated with the movement of the truck D.

Driving the first chain in one direction and freeing the second chain: In this case, the body W is rotated in one direction even when the carriage D is stopped.

Driving the first chain in the other direction and freeing the second chain (the same applies when the first chain is free and the second chain is driven in the other direction): In this case, even if the bogie D is stopped,
The body W is rotated in the direction opposite to the above case.

Note that the above is the same even when a rack bar is used instead of the chain. When the rack bar is always arranged in a fixed state (in this case, the traveling of the bogie D is a prerequisite for the rotation of the body W), the rack bar is intermittently arranged, or the position at which the rack bar is arranged is left and right By setting arbitrarily, the body W can be rotated in an arbitrary direction according to the traveling position of the cart D, and the rotation of the body W can be stopped at an arbitrary position.

Further, the rotating jig 1 may be of a two-part configuration for the front side and the rear side of the body W.

(Effects of the Invention) As is apparent from the above description, the present invention can prevent the deformation of the portion of the automobile body to which the rotating jig is attached without providing a separate reinforcing member, and the automobile body can be used for this rotation. By rotating it through a jig, a coated surface with more excellent smoothness can be obtained if the coating film has the same thickness. In particular, the time for which the automobile body is kept rotating until the paint does not drip becomes considerably long, but it is sufficient to withstand such a long period of rotation of the automobile body.

[Brief description of drawings]

FIG. 1 is an overall process diagram showing an embodiment of the present invention. FIG. 2 is a view showing a state in which the posture of the automobile body as an object to be coated is changed as the automobile body rotates. 3 and 4 are graphs showing the relationship between the thickness and sag of the coating material, the smoothness of the coated surface, and the rotation. FIG. 5 is a side view showing an example of a trolley for carrying a body in which the body is rotated. FIG. 6 is a partially cutaway plan view showing a state below the traveling path of the carriage. FIG. 7 is a sectional view taken along line X7-X7 of FIG. FIG. 8 is a side view showing an example of a rotating jig. FIG. 9 is a plan view of FIG. FIG. 10 is a sectional view taken along line X10-X10 in FIG. FIG. 11 is a sectional view taken along line X11-X11 in FIG. FIG. 12 shows another example of the rotating jig, and is a side view in a state where the jig is attached to the body. FIG. 13 is a plan view of the rotating jig shown in FIG. FIG. 14 is a sectional view taken along line X14-X14 in FIG. FIG. 15 is a sectional view taken along line X15-X15 in FIG. FIG. 16 is a side sectional view showing a connecting portion between the rotating jig and the carriage. FIG. 17 is a sectional view taken along the line X17-X17 in FIG. FIG. 18 is a plan view of FIG. FIG. 19 is a sectional view taken along the line X19-X19 in FIG. FIG. 20 is a sectional view taken along line X20-X20 of FIG. FIG. 21 is a plan view of FIG. P1 to P4: Process W: Car body l: Rotation axis D: Transport carriage 1: Rotation jig 2F, 2R: Rotation shaft part 3: Connection part 4F, 4R: Arm part 5FR, 5FL, 5RR, 5RL: Mounting 11FR, 11FL, 11RR, 11RL: Suspension tower 12: Frame 13: Wheel apron panel 15: Cross member 16: Rear side panel 26, 27: Strut (support) 28: Support space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiaki Kazuki 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) Reference JP-A-63-178871 (JP, A) JP-A-SHO 54-61933 (JP, A) JP-A-57-30581 (JP, A) Actual development 60-21361 (JP, U) US patent 2658008 (US, A) UK patent 654118 (GB, A)

Claims (1)

(57) [Claims] 1. A coating step of applying a paint on a surface of an automobile body as an object to be coated to a thickness equal to or more than a sag limit, and after the painting step, a paint applied while rotating the automobile body around a substantially horizontal axis. It is dried, and the rotation at this time is started before the paint sags due to gravity, and before the paint sags of the applied paint is caused due to gravity, the surface of the automobile body is changed from a substantially vertical state to a substantially horizontal state. A rotating jig that is used in a coating line equipped with a drying process that is performed at a rotational speed and that rotates an automobile body, and is a supported portion that serves as a rotation center of the automobile body. Has a rotating shaft portion and an attachment portion for the automobile body, and is used as an attachment portion for foot parts formed on the automobile body or a portion excellent in strength located in the vicinity thereof. The jig for rotating an automobile body in a painting line is characterized in that it is set so that the mounting portion can be mounted.