JP2006026595A - Method for coating article to be coated and rotary apparatus of article to be coated for coating usable for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for coating articles to be coated which is suitable for reduction of the amount of a coating used, shortening of the coating time, shortening of working hours of workers and further improvement of the quality of coating, and to provide a rotary apparatus of the articles for coating usable for the above method in coating the articles such as an amount of articles. <P>SOLUTION: There are provided a rotary shaft 2 rotatable around an axis center P1 and a plurality of holding components 3 of the articles arranged at intervals in the peripheral direction around the rotary shaft 2. The articles are used which have flat shapes with thickness dimension parts 4a and extended dimension parts 4c longer than the thickness dimension parts 4a in section. The articles 4 are held to the respective holding components 3 of the articles of the rotary apparatus 1 of the articles. The articles to be coated 4 are rotated along a circumferential track PA surrounding the axis P1 of the rotary shaft 2 by rotating the rotary shaft 2 of the rotary apparatus 1 while keeping the extended dimension parts 4c of the articles 4 line along the circumferential track PA surrounding the axis of the rotary shaft 2. The articles are coated by injection from a coating injection component 6 in the outside of the circumferential track PA when rotating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for coating an object to be coated, and an apparatus for rotating an object to be coated that can be used for the method. For example, the present invention relates to an object painting method suitable for painting an object typified by a large part such as a spoiler mounted on a vehicle, and an object rotating device for painting that can be used for the method.

  Conventionally, as a coating method for exterior parts and the like, generally, a coating robot or a coating worker strokes a coating gun left and right at a predetermined distance on an object to be coated and sprays the coating. For example, in the case of small parts such as the outside handle of a vehicle, a plurality of parts can be arranged at equal intervals and applied simultaneously (Patent Document 1).

  In Patent Document 1, as shown in FIG. 11, a rotating shaft 510 having a horizontal axis P100 and a plurality of objects to be coated arranged radially around the axis P100 of the rotating shaft 510 at intervals. A coating method using a coating apparatus provided with a device 500 having a holding unit 520 and a paint spray nozzle 600 facing the device 500 is disclosed. According to this, a plurality of objects 700 such as outer handles are attached to the object holding portion 520 of the apparatus 500.

  Thereafter, the rotating shaft 510 is rotated around the axis P100 to rotate the object 700 around the rotating shaft 510, and the paint is ejected from the paint ejection nozzle 600 onto the object 700 to be coated. ing. In this case, since a plurality of objects 700 can be coated at the same time, productivity is good.

Furthermore, as a coating technique using a jig, Patent Document 2 discloses that a resin molded product having a conductive layer formed thereon is attached to a mounting jig so that the conductive layer is grounded and the resin molding is performed in a grounded state. An electrostatic coating method for performing electrostatic coating on a product is disclosed.
JP 2001-121048 A JP 2003-275661 A

  However, according to the technique according to Patent Document 1, as described above, since a plurality of objects 700 can be coated at the same time, productivity is good. However, as can be understood from FIG. 10, the object to be coated is placed in a state in which the extension dimension portion of the object to be coated is arranged along the circumferential locus PA defined by the rotation radius around the axis P100 of the rotation shaft 510. It does not adopt a holding method. For this reason, there is a limit in reducing variation in the distance between the paint jet nozzle 600 and the object to be coated, and there is a limit in further improving the coating quality.

  In addition, when a large part typified by a spoiler that is mounted on the body of a vehicle and has a function of reducing lift using the airflow during vehicle travel is the object to be painted, from the size of the painted area, The fact is that only one can be painted. Therefore, it takes a long time to paint, and the amount of overspray (a paint that is not applied to the object to be coated) increases. Moreover, since the painting range of large parts such as spoilers covers both the front and back surfaces, painting is performed while changing the angle of the jig. In this case, the robot trajectory is difficult to handle and requires human work, making it difficult to fully automate. However, in order to reduce the cost of coated products, it is required to reduce the amount of paint used, shorten the painting time, and reduce the number of man-hours required for work.

  The present invention has been made in view of the above-described circumstances, and in coating a coating object such as a large part typified by a spoiler, the amount of paint used is reduced, the painting time is shortened, and the number of man-hours for work is reduced. Furthermore, it is an object of the present invention to provide a method of painting an object suitable for improving the quality of painting, and an object rotating device for painting that can be used for the method.

(1) A method of painting an object to be coated according to the first aspect of the present invention includes a rotating shaft that can rotate around an axis, and a plurality of objects that are disposed around the rotating shaft at intervals in the circumferential direction. A step of preparing an object rotating device having a holding unit;
Using a workpiece that has a flat cross-sectional shape that has a wall thickness dimension section that defines the wall thickness in the cross section and an extension dimension section that is longer than the wall thickness dimension section, and the axis of the rotating shaft A process of holding the object to be coated in the object holding part in a state in which the extension dimension part of the object to be coated is arranged along a circumferential trajectory defined by the center turning radius;
A plurality of objects to be coated around the axis of the rotating shaft by rotating the rotating shaft of the object rotating device while maintaining the state where the extended dimension part of the object to be coated is arranged along the circumferential locus. A rotation process is performed along a circumferential locus, and at the time of rotation, a coating process for coating an object to be coated from a paint discharge portion outside or inside the circumferential locus is sequentially performed.

  According to the method for coating an object to be coated according to the first aspect of the present invention, the elongated dimension portion of the object to be coated is disposed along a circumferential trajectory defined by a rotation radius centered on the axis of the rotation shaft. To maintain. In this state, by rotating the rotating shaft of the object rotating device, the object to be rotated is rotated along the circumferential locus around the axis of the rotating shaft. In this state, the object to be coated is painted from the paint discharge part, so that the variation in the distance between the object to be painted and the paint discharge part is reduced, the unevenness of the coating film thickness is suppressed, and the coating quality is reduced. improves.

(2) A method for painting an object to be coated according to the second aspect of the present invention is the method according to claim 1, wherein after the first painting step, the front and back of the object to be coated are reversed and the rotation about the axis of the rotation shaft is performed. A reversing step of arranging an elongated dimension part of the object to be coated along a circumferential locus defined by a radius;
By rotating the rotating shaft of the object rotating device while maintaining the state where the elongated dimension part of the object is arranged along the circumferential trajectory, the object is circled around the axis of the rotating shaft. It rotates along a locus, and at the time of rotation, it carries out in order by performing the 2nd painting process which paints an object to be coated from the paint discharge part outside or inside a circumference locus.

  According to the method for painting an object to be coated according to the second aspect of the present invention, the elongated dimension portion of the object to be coated is arranged along a circumferential locus defined by a radius of rotation centered on the axis of the rotation shaft. To maintain. In this state, by rotating the rotating shaft of the object rotating device, the object to be rotated is rotated along the circumferential locus around the axis of the rotating shaft. In this state, the object to be coated is painted from the paint discharge part, so that the variation in the distance between the object to be painted and the paint discharge part is reduced, the unevenness of the coating film thickness is suppressed, and the coating quality is reduced. improves.

(3) A coating object rotating device for painting according to the third aspect of the present invention is a coating object rotating device that can be used in the method for coating an object to be coated according to claim 1 or claim 2,
A rotating shaft that can rotate around an axis;
Around the axis of the rotating shaft, it is arranged at intervals in the circumferential direction, and the extension dimension part of the object to be coated is arranged along a circumferential locus defined by the rotation radius centered on the axis of the rotating shaft And a plurality of object holding parts for holding the object to be coated in a state where the object is to be coated.

  According to the coating object rotating apparatus for painting according to the third aspect of the present invention, the extension dimension portion of the object to be coated is disposed along a circumferential locus defined by a rotation radius centered on the axis of the rotating shaft. Maintain the state. In this state, by rotating the rotating shaft of the object rotating device, the object to be rotated is rotated along the circumferential locus around the axis of the rotating shaft. In this state, the object to be coated is painted from the paint discharge part, so that the variation in the distance between the object to be painted and the paint discharge part is reduced, the unevenness of the coating film thickness is suppressed, and the coating quality is reduced. improves.

(4) A coating object rotating device for painting according to the present invention of the fourth aspect is a coating object rotating device that can be used in the method for coating an object to be coated according to claim 1 and claim 2,
A rotating shaft that can rotate around an axis;
A first drive unit for revolution that can be switched between a form that does not rotate the rotating shaft and a form that rotates the rotating shaft;
Around the axis of the rotating shaft, it is arranged at intervals in the circumferential direction, and the extension dimension part of the object to be coated is arranged along a circumferential locus defined by the rotation radius centered on the axis of the rotating shaft A plurality of object holding parts capable of reversing the front and back of the object to be coated,
It has a 2nd drive part for reversal which can be switched to the form which does not reverse the thing holding part to be coated, and the form which reverses the object holding part.

  An elongated dimension portion of the object to be coated is arranged along a circumferential locus defined by a rotation radius centered on the axis of the rotation shaft. In this state, the first drive unit for revolution is switched to a form in which the rotating shaft is rotated. In this state, the first drive unit for revolution is driven. As a result, the object to be coated is rotated around the axis of the rotating shaft while the elongated dimension portion of the object to be coated is along the circumferential locus defined by the rotation radius around the axis of the rotating shaft. In this state, the object to be coated is painted from the paint discharge part, so that the variation in the distance between the object to be painted and the paint discharge part is reduced, the unevenness of the coating film thickness is suppressed, and the coating quality is reduced. improves. When the reversing process is performed, the reversing second drive unit is switched to a form in which the object holding unit is reversed. A 2nd coating process can be implemented after an inversion process.

  ADVANTAGE OF THE INVENTION According to this invention, the to-be-painted object coating method suitable for coating large parts, such as a spoiler, a roof molding, and a bumper, and the to-be-painted object rotating apparatus which can be used for this can be provided.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described. In the coated object coating method according to the present embodiment, a coated object rotating apparatus 1 is prepared. The object rotation device 1 is arranged with a rotation axis 2 along a horizontal direction that can rotate around an axis P1 and an equal interval or a substantially equal interval around the rotation axis 2 at intervals in the circumferential direction. A plurality of (three) objects to be coated holding portions 3.

  FIG. 5 schematically shows the workpiece 4. The object to be coated 4 is a large part, specifically a spoiler mounted on a vehicle. The spoiler reduces the lift that acts on the vehicle when the vehicle is traveling. This article 4 has a flat cross-sectional shape and a long length LA along the vehicle width direction of the vehicle. The object to be coated 4 includes a surface 40 that is a design surface that is frequently viewed by a user or the like when mounted on a vehicle, and a back surface 42 that faces away from the surface 40 and that is frequently viewed when mounted on a vehicle and lower than the surface 40. Have. According to this embodiment, after the back surface 42 of the article 4 is painted, the surface 40 of the article 4 is painted.

  As shown in FIG. 5, the object to be coated 4 has a cross-sectional view of a thickness dimension portion 4 a that defines the thickness, and an extension dimension portion 4 c that intersects the thickness dimension portion 4 a in an orthogonal state. The extension dimension part 4c is longer than the thickness dimension part 4a. An imaginary line 4x relating to the object to be coated 4 virtually connects one end 4r of the cross-sectional shape of the elongated dimension portion 4c and the other end 4s of the sectional shape of the elongated dimension portion 4c at the shortest distance.

  First, as shown in FIG. 1, the objects to be coated 4 are held independently by the plurality of objects to be painted holding portions 3 of the object to be coated rotating apparatus 1. In this case, in a state where the shaft-shaped object holding portion 3 is inserted into the insertion hole 4v formed in advance in the object 4 to be coated, the object 4 is to be covered using bolts and nuts not shown. Fix to the paint holding unit 3. In this case, as shown in FIG. 1, the back surface 42 of the object 4 is exposed outward, and the surface 40 of the object 4 is directed inward, that is, toward the rotating shaft 2. .

  In this case, as shown in FIG. 1, the elongated dimension portion 4 c of the object to be coated 4 is arranged along the circumferential locus PA defined by the rotation radius R <b> 1 centering on the axis P <b> 1 of the rotation shaft 2. Therefore, the virtual line 4x that virtually connects the one end 4r and the other end 4s with respect to the article 4 to be coated at the shortest distance is substantially along the direction of the tangent line F of the circumferential locus PA. Here, the tangent line F is a tangent line that intersects perpendicularly to the radial virtual line 4k that connects the axis P1 of the rotating shaft 2 and the axis P2 of the workpiece holding part 3 in the radial direction in the circumferential locus PA. F means.

  In the first painting step, the rotating shaft 2 of the article rotating device 1 is rotated around the axis P1 while maintaining the extension dimension portion 4c of the article 4 along the circumferential path PA described above. Then, it is rotated in one direction, that is, in the direction of arrow M1 by a drive motor (not shown). This rotation is equivalent to revolving a plurality of objects to be coated 4 around the axis P <b> 1 of the rotating shaft 2. In this case, the rotation speed of the article 4 at the time of revolution can be appropriately set according to the size of the article 4, the vehicles, the required coating quality, etc., but is 3 to 700 rpm, 10 to 400 rpm, 50 to 50 Examples thereof include 200 rpm and 80 to 150 rpm.

  In this manner, when the workpiece 4 is rotated along the circumferential locus PA in a state where the elongated dimension portion 4c of the workpiece 4 is disposed along the circumferential locus PA, the elongated dimension portion 4c is moved to the circumferential locus. It is also advantageous to reduce the air resistance of the article 4 to be coated, when the degree of crossing PA is large. Therefore, even when the rotation speed is high, it is advantageous to reduce the displacement of the article 4 during rotation.

  Furthermore, in order to improve the quality of the coating, the paint particles that are ejected from the paint discharge section 6 but do not adhere to the object 4 to be coated and float around the object 4 are removed. It is preferable to prevent 4 from being caught. When the extent to which the elongated dimension portion 4c of the object to be coated 4 intersects the circumferential locus PA is large, the area of collision with air increases, so that the object to be coated 4 is likely to entrain floating paint particles. However, if the workpiece 4 is rotated along the circumferential locus PA in the state where the elongated dimension portion 4c of the workpiece 4 is along the circumferential locus PA as described above, the elongated dimension portion 4c is Compared with the case where the degree of intersection with the circumferential locus PA is large, the area of collision with the air is reduced, so that the object 4 rotating along the circumferential locus PA is prevented from entraining floating paint particles. Can do. Also in this sense, it is advantageous to ensure the coating quality of the article 4 to be coated.

  As described above, according to this embodiment, the plurality of objects to be coated 4 are rotated along the circumferential locus PA around the axis P <b> 1 of the rotating shaft 2. And at the time of rotation, the coating material 6a is ejected from the coating material discharge | release part 6 of the outer side of the circumference locus PA toward the back surface 42 of the to-be-coated object 4, and the back surface 42 of the to-be-coated object 4 is painted. In such a first coating process, the back surface 42 of the plurality of objects to be coated 4 is mainly coated. In the first painting process, the paint discharger 6 reciprocates at a predetermined speed along the axis P1 of the rotating shaft 2, that is, along the length dimension LA of the article 4 to be coated.

  The overspray (paint that is not applied to the object 4 even if it is ejected) will be described. As can be understood from FIG. 1, the coating material 6a is ejected from the coating material discharge portion 6 outside the circumferential path PA to the back surface 42 of the object to be coated 4A and is applied to the back surface 42 of the object to be coated 4A. At this time, as shown in FIG. 1, also on the surface 40 opposite to the back surface 42 of the object 4B adjacent to the front of the object 4A, the object 4B adjacent to the back of the object 4A. Since the paint may adhere to the surface 40 on the opposite side to the back surface 42, the surface 40 of the object to be coated 4B and the surface 40 of the object to be coated 4C can be painted. For this reason, overspray (paint which is not painted on the article 4 even if it is ejected) is reduced.

  As described above, the first painting step of painting the back surface 42 of the article 4 is performed. When the first painting process is completed, a reversing process is performed. In the reversing process, after the rotation of the rotating shaft 2 is stopped and the rotation of the object 4 is stopped, the object 4 is moved around the axis P2 of the object holding part 3 as shown in FIG. It is rotated in one direction, that is, in the direction of the arrow M2. Thereby, the front and back of the article to be coated 4 are inverted, and the front surface 40 and the back surface 42 of the object to be coated 4 are inverted. This inversion corresponds to the rotation of the article 4 to be coated. By this reversal process, the back surface 42 of the article 4 is directed inward, and the surface 40 of the article 4 is exposed outward. Also in this case, the elongated dimension portion 4c of the article 4 is arranged along the circumferential locus PA defined by the rotation radius R1 centered on the axis P1 of the rotation shaft 2. As a result, as in the case of the first painting step, the virtual line 4x that virtually connects the one end 4r and the other end 4s with respect to the cross section of the article 4 is substantially along the direction of the tangent line F of the circumferential locus PA.

  According to the present embodiment, the space 800 is formed between the objects to be coated 4 adjacent to each other in the circumferential direction of the circumferential locus PA. For this reason, in a reversal process, as shown in FIG. 3, the to-be-coated object holding | maintenance part 3 can be collectively rotated simultaneously. As a result, the front and back of the object to be coated 4 can be reversed at the same time for a plurality of objects to be coated 4 held in the object to be coated holding part 3, and the time required for the reversing process can be shortened. This is advantageous for improving productivity. In the reversing process, the coating process for the article 4 is not performed. In the reversal process, after the revolution of the article to be coated 4 is stopped, the article to be painted 4 may be reversed, or the article to be painted 4 may be reversed while the object to be painted 4 is revolved. .

  When the reversing process is completed as described above, the second coating process (see FIG. 4) is then performed. The second painting process is basically the same as the first painting process. However, painting is performed on the surface 40 of the article 4 to be visually recognized. For this reason, the surface 40 of the article 4 is exposed to the outside. That is, in the second painting step, as shown in FIG. 4, while maintaining the arrangement of the elongated dimension portion 4c of the article 4 along the circumferential locus PA around the axis P1 of the rotating shaft 2, The rotating shaft 2 of the article rotating device 1 is rotated in one direction, that is, in the direction of the arrow M1. As a result, the plurality of objects to be coated 4 are rotated along the circumferential locus PA around the axis P1 of the rotation shaft 2. At the time of rotation, the coating material 6a is ejected from the coating material discharge part 6 (for example, coating material ejection nozzle) arrange | positioned on the outer side of the circumference locus PA, and the surface 40 of the some to-be-coated object 4 in rotation is each coated. In addition, the rotation direction of the to-be-coated object 4 is the same in the 1st painting process and the 2nd painting process.

  As described above, according to the present embodiment, the elongated dimension portion 4c of the workpiece 4 is set along the circumferential locus PA defined by the rotation radius R1 centered on the axis P1 of the rotation shaft 2. By rotating the rotating shaft 2 of the object rotating device 1 while maintaining this state, the object 4 is rotated along the circumferential locus PA around the axis P1 of the rotating shaft 2, The object 4 can be painted from the paint discharge part 6 outside the locus PA. For this reason, compared with the case where the extent to which the expansion | extension dimension part 4c of the to-be-coated object 4 and the circumference locus PA cross | intersect is high, it is between the coating material discharge | release part 6 and the to-be-coated object 4 (surface 40, back surface 42). Distance variation is reduced. Accordingly, it is possible to satisfactorily coat the article 4 to be coated, to suppress unevenness in the thickness of the coating film, and to improve the coating quality.

  As a feature of the coating method according to the present embodiment, since the front surface 40 and the back surface 42 of the object 4 can be reversed, the entire surface of the object 4 to be coated such as a spoiler can be easily dealt with. Since a plurality of objects to be coated 4 can be arranged along the circumferential trajectory PA, the object 4 can be coated at a constant distance along the circumferential trajectory PA, and the skin level difference in the paint state -It is advantageous for reducing the film thickness difference. Furthermore, it is not necessary to teach an excessively complicated robot, and since there are no unpainted portions of the article 4 to be coated, the painting process can be automated easily. Thus, both the front surface 40 and the back surface 42 of the three objects to be coated 4 (spoiler) can be painted at the same time, and the coating time can be shortened. In addition, the amount of overspray is reduced.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. Embodiment 2 is Embodiment 1
Are applied mutatis mutandis and have basically the same configuration and the same operational effects as the first embodiment. Hereinafter, the description will focus on the different parts. As shown in FIGS. 6 to 8, the coating object rotating device 1 for painting is a rotation and revolution device that performs revolution and rotation of the object to be coated 4. As shown in FIG. 6, the article rotation device 1 includes a driving mechanism 100 that faces each other and a transport mechanism 300 that is transported in the direction perpendicular to the paper surface of FIG. 6 between the driving mechanisms 100 that face each other.

  The transport mechanism 300 of the article rotating apparatus 1 includes a horizontally-rotatable rotating shaft 2 that is disposed in a horizontal direction, a main holding unit 70 that holds the rotating shaft 2 on a base 71 in the horizontal direction, A plurality of horizontally long object-to-be-painted holding parts 3 which are arranged at equal intervals or substantially equal intervals in the circumferential direction and are arranged in the horizontal direction, and one end of the rotating shaft 2 in the axial direction and an axial shape A sub-holding portion 72a (72) in which one end in the axial length direction of the object-to-be-coated holding portion 3 is connected, the other end in the axial length direction of the rotating shaft 2 and the axial length of the shaft-like to-be-coated object holding portion 3 And a sub-holding portion 72b (72) connected to the other end in the direction. Therefore, if the rotating shaft 2 rotates about the axis P 1, the object holding unit 3 rotates integrally around the axis P 1 of the rotating shaft 2 via the sub holding unit 72. As a result, the plurality of objects to be coated 4 held by the plurality of objects to be coated holding portions 3 are simultaneously rotated around the axis P <b> 1 of the rotating shaft 2.

  The drive mechanism 100 is a mode in which the first drive unit 110 for revolution that can be switched between a mode in which the rotary shaft 2 is not rotated and a mode in which the rotary shaft 2 is rotated around the axis P1 and a mode in which the object holding unit 3 is not reversed. And the second drive unit 150 for reversing that can be switched to a form for reversing the object 4 by rotating the object holding part 3 and the object holding part 3 by releasing the lock on the object holding part 3 And a release element 170 for enabling the part 3 to be reversed.

  As shown in FIG. 6, the first drive unit 110 for revolution of the drive mechanism 100 is provided at the drive motor 111, the first drive shaft 112 rotated by the drive motor 111, and the tip of the first drive shaft 112. And a grip portion 113. The grip part 113 can be switched between a form in which the grip part 2m provided at the shaft end of the rotating shaft 2 is detachably gripped and a form in which the grip part 2m is not gripped. When the drive motor 111 rotates and the first drive shaft 112 rotates while the grip portion 113 grips the grip portion 2m provided at the shaft end of the rotation shaft 2, the rotation shaft 2 has the axis P1 thereof. Can rotate around. As a result, similarly to the first embodiment, the object to be coated 4 held by the object holding portion 3 connected to the rotating shaft 2 is along the circumferential locus PA around the axis P1 of the rotating shaft 2. Rotate. On the other hand, if the grip portion 113 does not grip the grip portion 2m provided at the shaft end of the rotating shaft 2, the rotating shaft 2 is not rotated around the axis P1.

  As shown in FIG. 7, the second driving unit 150 for reversal of the driving mechanism 100 is fixed to the end 3e of the shaft-shaped object holding unit 3 and is 180 degrees out of phase in the circumferential direction. A rotary plate 153 (see FIG. 8) having a first locking hole 151 for locking and a second locking hole 152 for locking, and a joint-like shape that can be engaged with the end 3 e of the object holding portion 3. The second drive shaft 154 having the engaging portion 158, the second drive motor 155 that rotates the second drive shaft 154, and the first locking hole 151 or the second locking hole 152 of the rotating plate 153 are engaged and disengaged. The lock engagement body 156 is locked and locked, and a spring member such as a coil spring that urges the first engagement hole 151 or the second engagement hole 152 in a direction in which the lock engagement body 156 is engaged. And a biasing member 157.

  As shown in FIG. 7, the release element 170 moves toward the release direction (arrow WA direction), that is, toward the lock engaging body 156. When the release element 170 moves in the direction of the arrow WA toward the lock engaging body 156, the tip 170c of the release element 170 presses the pressing surface 158x of the lock engaging body 156, and the lock engaging body 156 is the first engaging hole. 151 or the second locking hole 152. When the lock latching body 156 is detached from the first latching hole 151 or the second latching hole 152 in this way, the lock on the object holding part 3 is released, and the object holding part 3 has the axis P2 thereof. Can be reversed around. In this state, when the second drive shaft 154 moves in the engagement direction, that is, in the direction of the arrow WB, the engagement portion 158 of the second drive shaft 154 engages with the end portion 3e of the object holding portion 3. In this state, if the second drive motor 155 is driven and the second drive shaft 154 is rotationally driven around its axis, the object holding unit 3 rotates 180 degrees around its axis P2 ( Can be reversed).

  When the object holding unit 3 rotates 180 degrees around the axis P2 in this way, the front and back of the object 4 held by the object holding unit 3 are reversed. When the reversal of the article 4 is completed in this way, the release element 170 moves in the direction opposite to the arrow WA direction, and the lock engaging member 156 is engaged with the first engagement of the turntable 153 by the urging force of the urging member 157. The lock hole 151 is detachably locked to the stop hole 151 or the second lock hole 152. In this way, the inversion process is completed. When the reversal process is completed, the second painting process is performed as in the first embodiment.

(Test example)
Table 1 shows the results of simulation experiments on the coating method according to the conventional example, the coating method according to the comparative example, and the coating method according to the first embodiment using the vehicle spoiler of the same size and the same material. As a painting method according to the conventional example, both the front and back surfaces of the spoiler are painted manually by an operator. About the coating method which concerns on a comparative example, operation using the extended dimension part 4c of the to-be-coated article 4 along the circumference locus PA around the axis P1 of the rotating shaft 2 is performed while using the apparatus shown in FIG. Without performing, that is, while increasing the degree of crossing of the spoiler with the circumferential locus PA, the first painting step, the reversing step, and the second painting step were sequentially performed to coat both the front and back surfaces of the spoiler.

  About the usage-amount of coating material and the coating time, the conventional example was displayed as 100 relatively. As shown in Table 1, according to the coating method according to Embodiment 1, the skin level rank and the film thickness of the coating film were stable. Furthermore, while stabilizing the skin level rank and film thickness of the coating film, significant effects of reducing the amount of paint used, shortening the coating time, and reducing the number of work steps by the operator were obtained.

(Application form)
FIG. 9 shows an example of the application form. FIG. 9 shows a spoiler 902 mounted on the rear 901 of the vehicle 900. The spoiler 902 is a large-sized component having a resin base material extending along the vehicle width direction of the vehicle 900 and is entirely painted.

(Other embodiments)
The third embodiment shown in FIG. 10 has basically the same configuration as that of the first embodiment and has the same functions and effects. A 1st painting process, an inversion process, and a 2nd painting process can be implemented. However, although the cross section of the article 4 is flat, the size is increased. When the size of the object to be coated 4 is increased, the variation in the thickness of the coating film of the object to be coated 4 can be reduced by increasing the diameter of the circumferential locus PA.

  According to the above-described embodiment, the paint 6a is ejected from the paint discharge portion 6 outside the circumferential locus PA toward the object 4 to be painted, and the object 4 is painted. The paint 6a may be ejected from the paint release part 6 on the inside toward the article 4 to be coated. In the first painting process and the second painting process, the rotation direction of the article 4 is the same, but may be reversed. According to the above-described embodiment, after the back surface 42 of the article 4 is painted, the surface 40 of the article 4 is painted. Conversely, after the surface 40 of the article 4 is painted, The back surface 42 of the article 4 may be painted. Furthermore, although both the front surface 40 and the back surface 42 of the article 4 are painted, only one of them may be painted. Although the object 4 is applied to a spoiler, the present invention is not limited to this, and it may be applied to large parts (for example, a length of 50 cm or more) such as a roof molding and a bumper. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

  The present invention can be used for painting large parts such as spoilers.

It is a block diagram which shows the state which is painting about the back surface of a to-be-coated object in a 1st coating process. It is a block diagram which shows the state which is painting about the back surface of a to-be-coated object in a 1st coating process. It is a block diagram which shows the inversion process which inverts the to-be-coated object. It is a block diagram which shows the state which is coating about the surface of to-be-coated object in a 2nd coating process. It is a perspective view which shows a to-be-coated object in simulation. It is a block diagram which concerns on Embodiment 2 and shows a to-be-painted object rotation apparatus. It is a block diagram which concerns on Embodiment 2 and shows the principal part of to-be-coated object. It is a block diagram which shows the rotation board which concerns on Embodiment 2 and is a principal part of to-be-coated object. It is a perspective view which shows the application form and shows the spoiler with which the rear part of the vehicle is equipped. It is a block diagram which shows the rotation board which concerns on Embodiment 3 and is a principal part of a to-be-coated object. It is a block diagram which relates to a prior art, and is a block diagram which shows the state which is painting about the to-be-painted object which is small parts.

Explanation of symbols

  In the figure, 1 is an object rotating device, 2 is a rotating shaft, P1 is an axis, PA is a circumferential locus, 3 is an object holding part, 4 is an object to be coated, 40 is a surface, 42 is a back surface, 4a Is a thickness dimension part, 4c is an extension dimension part, 4x is an imaginary line, 5 is a rotating shaft, 6 is a paint discharge part, 100 is a drive mechanism, 300 is a conveyance mechanism.

Claims (4)

Preparing a coating object rotating device having a rotating shaft rotatable around an axis and a plurality of coating object holding portions disposed around the rotating shaft at intervals in the circumferential direction;
Using an object to be coated having a flat cross-sectional shape having a wall thickness dimension part that defines a wall thickness in a cross section and an extension dimension part that intersects the wall thickness dimension part and is longer than the wall thickness dimension part,
The object to be coated is held in the object holding part in a state where the extension dimension part of the object to be coated is arranged along a circumferential locus defined by a rotation radius centered on the axis of the rotating shaft. And a process of
By rotating the rotating shaft of the object rotating device around the axis of the rotating shaft while maintaining the state where the elongated dimension part of the object to be coated is disposed along the circumferential locus. A plurality of the objects to be coated are rotated along a circumferential trajectory, and at the time of the rotation, a coating process for coating the object to be coated from a paint discharge portion outside or inside the circumferential trajectory is sequentially performed. Characteristic method of painting objects. In Claim 1, After the said painting process, while turning the front and back of the said to-be-coated object, along the said circumference locus | trajectory prescribed | regulated by the rotation radius centering on the axial center of the said rotating shaft, A reversing step of disposing the elongated dimension portion;
By rotating the rotating shaft of the object rotating device around the axis of the rotating shaft while maintaining the state where the elongated dimension part of the object to be coated is disposed along the circumferential locus. Rotating the object to be coated along the circumferential trajectory, and sequentially performing a second painting step of coating the object to be coated from the paint discharge portion outside or inside the circumferential trajectory when rotating. A method for painting an object to be painted. A coating object rotating device for coating that can be used in the coating method of the object according to claim 1 or claim 2,
A rotating shaft that can rotate around an axis;
The extension of the object to be coated along a circumferential trajectory that is arranged around the axis of the rotating shaft at intervals in the circumferential direction and is defined by a rotation radius centered on the axis of the rotating shaft A coating object rotating device for coating, comprising: a plurality of object holding parts for holding the object to be coated in a state in which the dimension part is arranged. A coating object rotating device for coating that can be used in the coating method of the object according to claim 1 or claim 2,
A rotating shaft that can rotate around an axis;
A first drive unit for revolution that can be switched between a form that does not rotate the rotating shaft and a form that rotates the rotating shaft;
An extension dimension portion of the object to be coated along a circumferential locus that is arranged around the axis of the rotating shaft at intervals in the circumferential direction and is defined by a rotation radius centered on the axis of the rotating shaft. A plurality of object holding parts capable of holding the object to be coated in a state in which the object is disposed and inverting the front and back of the object to be coated;
A coating object rotating apparatus for coating, comprising: a reversing second drive unit that can be switched between a form that does not reverse the object holding part and a form that reverses the object holding part.

Images