JP2007152392A - Hemming method and hemming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of wrinkles and cracks by realizing a gentle shape change by adjusting a folding angle of a flange according to hemming portions. <P>SOLUTION: A hemming unit 10 brings a movable die 18 into contact with the back surface of a workpiece, and moves a hemming roller 30 in the elongating direction Z of the flange 17 while turning and bringing the hemming roller 30 into contact with the standing flange 17 of the edge portion of a workpiece, and bends the flange 17 toward the inside of the workpiece by catching the flange 17 by means of the hemming roller 30 and the movable die 18. The movable die 18 projects outward from the edge portion of the workpiece in the standing direction Y of the flange 17, and has a tilting portion 63a to be brought into contact with the hemming roller 30. The tilting portion 63a has a tilting surface, the height of which varies in the elongating direction Z. The hemming roller 30 rolls in a state that it is brought into contact with the tilting surface, and forms the gently changing shape in the bending angle of the flange 17 according to the hemming portions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hemming processing method and a processing apparatus for bending a flange while bringing a roller into contact with the flange on which an edge of a workpiece stands and rolling.

  Hemming processing is performed on the bonnet, trunk, door, and edge of the wheel house of an automobile by bending a flange from which the edge of the panel stands up toward the inside of the panel. Examples of the hemming process include a roll hemming process in which a panel is positioned and held on a mold and bent while pressing a roller against a flange at an end of the panel. In roll hemming, since the bending angle is large, the bending may be performed through a plurality of steps such as pre-bending (or pre-hemming) and finish bending (or main hemming) in consideration of bending accuracy.

  As an apparatus for roll hemming, an apparatus that performs hemming by sandwiching a panel flange between a pair of rollers (see, for example, Patent Document 1) has been proposed.

Japanese Patent Laid-Open No. 7-060370

  It is advantageous to leave part of the flange upright. However, according to the conventional roll hemming processing, the roller is pressed perpendicularly to the flange at the processing start position and bent, so that stress and shape are changed at the boundary between the position to remain standing and the bending position. The change is large and wrinkles may occur.

  The present invention has been made in consideration of such problems, and it is possible to realize a gradual shape change by adjusting the bending angle of the flange according to the processing location, and to prevent the occurrence of wrinkles and cracks. It is an object of the present invention to provide a hemming processing method and a processing apparatus that can be used.

  The present invention is a hemming method in which a flange of a workpiece is bent inwardly of the workpiece by a roller, and the roller is rolled in the extending direction while being displaced in a direction perpendicular to the extending direction of the flange. It is characterized by that. In this way, by rolling the roller while displacing it in a direction perpendicular to the extending direction of the flange, the bending angle of the flange can be adjusted according to the processing location, and the shape change becomes gradual and the wrinkle is reduced. Generation of cracks and cracks can be prevented.

  Further, the present invention is a hemming apparatus for bending a flange of a workpiece in an inner direction of the workpiece with a roller, wherein the mold protrudes outward from an end portion of the workpiece in a direction in which the flange stands, It has a distance limiting part which contacts a roller, The said distance limiting part has an inclined surface from which height changes toward the said extension direction, It is characterized by the above-mentioned.

  Thus, by providing the distance limiting portion having the inclined surface whose height changes in the extending direction of the flange, the pressing amount by which the roller presses the flange is limited according to the processing location, and the bending angle of the flange Can be adjusted, and the change in shape becomes gradual, and the occurrence of wrinkles and cracks can be prevented.

  Furthermore, the present invention is a hemming device for bending a flange of a work inward with respect to the work with a roller, and has a guide part for guiding the roller, and the guide part extends in parallel with the flange. The parallel portion that is present, and the start portion and / or the end portion where hemming is performed with respect to the flange so that the roller gradually approaches or separates from the flange, compared to the parallel portion. And a separating portion that is spaced outward.

  In this way, by providing the guide portion so as to be separated toward the outer side of the workpiece, the amount of pressure with which the roller presses the flange changes according to the processing location, and the bending angle of the flange is adjusted to change the shape. It is possible to prevent the occurrence of wrinkles and cracks.

  According to the hemming processing method and the processing apparatus according to the present invention, it is possible to realize a gradual shape change by adjusting the bending angle of the flange according to the processing location, and to prevent the occurrence of wrinkles, cracks, and the like.

  Hereinafter, embodiments of the hemming processing method and the processing apparatus according to the present invention will be described with reference to the accompanying FIGS.

  As shown in FIG. 1, the hemming processing apparatus 10 according to the present embodiment is set to an intermediate process in a production line 14 for assembling and processing a vehicle (workpiece) 12 in a so-called white body state. It is an apparatus for performing roll hemming on the flange 17 of the wheel arch portion 16 on the wheel side. The wheel arch portion 16 has a substantially arc shape of 180 °. In a state before processing by the hemming device 10, the flange 17 has a bent shape of 90 ° inward from the end 16 a (see FIG. 6) of the wheel arch portion 16.

  The hemming processing apparatus 10 includes a moving mold 18 that contacts a wheel arch portion 16 of a vehicle 12 that is a workpiece, a robot 22 that moves the moving mold 18 and includes a hemming unit 20 at a tip, and a predetermined line in a production line 14. It has a photoelectric sensor 23 that detects that the vehicle 12 has been transported to a position, and a controller 24 that performs overall control.

  The robot 22 is an industrial articulated type, and can move the hemming unit 20 to an arbitrary position and an arbitrary posture by a program operation. In the vicinity of the robot 22, a storage table 26 in which a plurality of types of moving molds 18 corresponding to the type of the vehicle 12 is arranged is provided, and position data of the storage table 26 is stored in the controller 24. The controller 24 is connected to an external production management computer (not shown) that controls the operation of the production line 14, and information indicating the type of the vehicle 12 conveyed on the production line 14 is supplied to the controller 24.

  As shown in FIG. 2, the hemming unit 20 includes a hemming roller 30 and a guide roller 32 provided so as to protrude from the end surface, and a chuck 34 provided on a side surface portion. The chuck 34 has a pair of fingers 36 that open and close under the action of the controller 24, and is used for moving the movable mold 18.

  The hemming roller 30 and the guide roller 32 are rotatably supported with respect to the support shafts 30a and 32a. Further, the hemming roller 30 and the guide roller 32 can move in the Y direction (the direction in which the support shafts 30a and 32a are arranged), and the distance between the support shaft 30a and the support shaft 32a is adjusted. It is possible to apply pressure to the member sandwiched between the two. Further, the hemming roller 30 and the guide roller 32 have a so-called floating structure, and can move in the Y direction and the X direction (the axial direction of the support shafts 30a and 32a) while maintaining a relative position, and are driven by an external force. And move elastically. That is, the support shaft 30a and the support shaft 32a can move in conjunction with the X direction and the Y direction while maintaining the adjusted interval.

  The hemming roller 30 includes a tapered roller 38 provided on the distal end side and a cylindrical roller 40 provided integrally with the tapered roller 38 and provided on the proximal end side. The taper roller 38 is a tapered truncated cone inclined at 45 ° in a side view, and the ridge line length L1 (see FIG. 6) is set slightly longer than the height H (see FIG. 6) of the flange 17. The cylindrical roller 40 has a cylindrical shape slightly larger in diameter than the maximum diameter portion on the proximal end side of the tapered roller 38, and the axial height L <b> 2 (see FIG. 6) is sufficiently large corresponding to the height H of the flange 17.

  The guide roller 32 has a disk shape with a narrow periphery, and engages with a first groove (guide portion) 52 or a second groove (guide portion) 54 (see FIG. 6) provided in the movable mold 18. Is possible.

  As shown in FIGS. 3 and 4, the moving mold 18 is configured based on a mold plate 49. The mold plate 49 has a plate shape, and the side contacting the wheel arch portion 16 is referred to as a front surface 49a, and the opposite surface is referred to as a back surface 49b. Further, as viewed from the end 16a of the wheel arch part 16, the workpiece side is called the inner side (arrow A1 side) and the opposite side is called the outer side (arrow A2 side).

  The mold plate 49 has an arch-shaped plate shape in which the surface 49 a abuts around the wheel arch portion 16, and the surface 49 a is set to a three-dimensional curved surface that matches the surface shape of the vehicle 12. Therefore, when the movable mold 18 is attached to the wheel arch portion 16, the first groove 52 and the second groove 54 and the flange 17 are disposed in parallel, and the surface 49a is in surface contact with the vehicle 12 over a wide area. To do.

  The movable mold 18 includes an outer arc portion 50 formed slightly outside the end portion 16a of the wheel arch portion 16, a first groove 52 and a first groove 52 provided in parallel along the outer arc portion 50 on the back surface 49b. It has two grooves 54, a knob 56 provided on the back surface 49 b, three suction mechanisms (mounting means) 58 provided side by side, and a pipe 60 for sucking air through the suction mechanism 58. The first groove 52 is provided outside the end 16a of the flange 17 on the mold plate 49, and the second groove 54 is provided inside the end 16a. Further, the moving mold 18 includes two positioning pins 62 protruding from both lower ends of the surface 49a and inclined portions (distance limiting portions) 63a that gradually increase downward at both ends of the outer arc portion 50. 63b. The highest part at the lower end of the inclined parts 63a, 63b is set slightly higher than the height H of the flange 17.

  The means for attaching the moving mold 18 to the wheel arch portion 16 is not limited to the suction mechanism 58, and a clamp mechanism that holds a predetermined portion of the vehicle 12 with a lever or the like may be used. A clamp mechanism or the like and the suction mechanism 58 may be used in combination.

  The positioning pin 62 is set to a diameter that can be inserted into the positioning hole 65 (see FIG. 1) of the vehicle 12, and the tip thereof is tapered so as to be easily inserted. Since the movable mold 18 is mainly supported and fixed by the suction mechanism 58, the positioning pin 62 is not required to have a strength for supporting the weight of the movable mold 18, and a small diameter is sufficient.

  The inclined portions 63a and 63b are formed so that one side surface is flush with the outer arc portion 50 and the other side surface is positioned close to the flange 17 (see FIG. 6). The inclined surfaces of the inclined portions 63a and 63b are gently curved surfaces, and the upper end portions of the inclined portions 63a and 63b are smoothly connected to the surface 49a.

  As shown in FIG. 5, the suction mechanism 58 is provided in a low step portion 64 having a slightly cut surface 49 a, and includes a gripper 66 having an area suitable for suction and an intake port 68 communicating with the gripper 66. Have. The gripper 66 has a two-layer structure of an adsorbing portion 67a of an elastic body (for example, rubber or sponge) and a base portion 67b that is harder than the adsorbing portion 67a, and the base portion 67b is fixed to the lower step portion 64. . The gripper 66 protrudes slightly from the surface 49a.

  The gripper 66 has a large number of lateral holes 70 on the surface. The lateral holes 70 gather at the base portion 67 b and communicate with the intake port 68. The intake port 68 is connected to the pipe 60 by a joint 72.

  According to such an adsorption mechanism 58, air is sucked from the respective side holes 70 by performing intake air from the pipe 60, thereby exerting an adsorption action, and the gripper 66 can be adsorbed on the surface of the wheel arch portion 16. The mold 18 is fixed. At this time, the suction portion 67a of the gripper 66 is slightly compressed and sucked. For intake of the pipe 60, an ejector, a vacuum pump, or the like may be used.

  Since the moving mold 18 abuts only around the wheel arch portion 16, it is small. Further, since the vehicle 12 is in contact with the vehicle 12 from the side surface, the vehicle 12 is not added with a weight, and is not set to be a load-bearing structure, so that it is set to be lightweight. Therefore, the movable mold 18 can be easily moved by the robot 22 by gripping the knob 56 with the chuck 34, and can be sucked by the suction mechanism 58.

  When the moving mold 18 is fixed to the wheel arch portion 16 by the suction mechanism 58 in the state of being positioned by the positioning pin 62, the outer arc portion 50 is more than the end portion 16a of the wheel arch portion 16 as shown in FIG. Is also arranged on the outer side (lower side in FIG. 6). The first groove 52 is disposed slightly outside the end portion 16a, and the second groove 54 is disposed inside the end portion 16a. They are arranged in parallel along the end 16a.

  Next, a processing method for performing roll hemming processing on the flange 17 of the wheel arch portion 16 using the hemming processing device 10 configured as described above will be described with reference to FIGS. 7 and 8. The processing shown in FIGS. 7 and 8 is executed by the moving mold 18, the hemming unit 20, and the robot 22 mainly under the control of the controller 24.

  First, in step S1, after confirming the information of the vehicle type of the vehicle 12 to be conveyed next from the production management computer, the robot 22 returns the currently held movable mold 18 to the specified position of the storage base 26, and the vehicle type. The other moving mold 18 corresponding to the above is gripped by the chuck 34. If the corresponding moving mold 18 is already held, this transfer operation is not necessary. Also, when a plurality of vehicles 12 of the same vehicle type are continuously conveyed, the moving mold 18 is held. Of course, there is no need to change.

  In step S2, the signal of the photoelectric sensor 23 is confirmed, and it waits until the vehicle 12 is conveyed. The vehicle 12 is conveyed by the production line 14 and stops at a predetermined position in the vicinity of the robot 22. When the conveyance of the vehicle 12 is confirmed by the photoelectric sensor 23, the process proceeds to step S3.

  In step S <b> 3, the moving mold 18 is attached to the wheel arch portion 16. That is, the moving mold 18 is moved by the operation of the robot 22, and the positioning pins 62 are inserted into the positioning holes 65 of the vehicle 12 to perform vertical and horizontal positioning, and then the moving mold 18 is further advanced to move the gripper 66. Lightly contact the surface of the vehicle 12.

  Further, after the force with which the robot 22 holds the moving mold 18 is reduced and the moving mold 18 is elastically displaceable with respect to the vehicle 12, air is sucked from the pipe 60 and the moving mold 18 is moved by the suction mechanism 58. The surface 49a is brought into contact with the vehicle 12. As a result, the movable mold 18 is attached to the wheel arch portion 16 and accurately positioned and fixed.

  In step S <b> 4, after opening the finger 36 of the chuck 34, the robot 22 and the hemming unit 20 are removed from the moving mold 18. At this time, since the moving mold 18 is fixed to the vehicle 12 by the suction mechanism 58 provided integrally with the moving mold 18, the moving mold 18 may be dropped or displaced even if the chuck 34 is removed. There is no.

  In step S <b> 5, the direction of the hemming unit 20 is changed, and then the outer arc portion 50 of the moving mold 18 is approached, and the guide roller 32 is engaged with the first groove 52.

  In step S6, the guide roller 32 and the hemming roller 30 are brought close to each other, and the movable mold 18 is sandwiched between the guide roller 32 and the cylindrical roller 40 as shown in FIG. At this time, the front end side of the cylindrical roller 40 is in contact with the lower end portion of the inclined portion 63 a, and the taper roller 38 is separated from the flange 17.

  In step S7, the first hemming process is started by rolling the guide roller 32 while engaging the first groove 52. At the first time of the first hemming step, the flange 17 is not bent because the tapered roller 38 is separated.

  In step S8, when the guide roller 32 is rolled while being engaged with the first groove 52, and the cylindrical roller 40 is kept rolling while being in contact with the inclined portion 63a, the inclined portion 63a gradually becomes lower. As shown in FIG. 9, the taper roller 38 comes into contact with the end portion of the flange 17 and bending is started. As the hemming unit 20 is moved, the inclined portion 63a is further lowered, so that the angle at which the flange 17 is bent gradually becomes steeper. In this way, the inclined portion 63a (and 63b) acts as a kind of cam that appropriately limits the distance between the surface 49a and the cylindrical roller 40 according to the processing location.

  In step S9, when the hemming unit 20 moves to a place where there is no inclined portion 63a, as shown in FIG. 10, almost all the ridge lines on the side surface of the taper roller 38 abut on the side surface of the flange 17, and the flange 17 is moved inward. Bend at 45 °.

  In other words, the hemming roller 30 and the guide roller 32 roll while rotating in opposite directions, and the flange 17 is continuously bent by the conical surface of the taper roller 38 to perform the first hemming step. At this time, since the hemming roller 30 and the guide roller 32 have a floating structure, the hemming roller 30 and the guide roller 32 can be displaced in the X direction and the Y direction while maintaining their relative positions. The guide roller 32 can move following the first groove 52 accurately.

  In this way, as shown in FIG. 11, the end of the flange 17 is not processed and is kept upright at 90 ° with respect to the surface of the wheel arch portion 16 in the extending direction of the flange 17. The bending angle gradually becomes steep along the direction, and the portion is not bent at approximately 45 ° where there is no inclined portion 63a.

  Although detailed description is omitted, the cylindrical roller 40 rides on the inclined surface of the inclined portion 63 b at the other end of the flange 17, and the tapered roller 38 is gradually separated from the flange 17. Therefore, similarly to the end portion on the processing start side, the flange 17 is processed so that the bending angle gradually becomes steeper along the extending direction.

  In step S10, as shown by a two-dot chain line in FIG. 12, the hemming roller 30 and the guide roller 32 are slightly separated from the moving mold 18, and the hemming unit 20 is advanced to advance the hemming roller 30. The guide roller 32 is advanced in the direction of the arrow X1. This advance distance is equal to the distance between the first groove 52 and the second groove 54.

  In step S11 of FIG. 8, the guide roller 32 is engaged with the second groove 54 as shown in FIG.

  In step S <b> 12, the guide roller 32 and the hemming roller 30 are brought close to each other, and the movable mold 18 is sandwiched and pressed by the guide roller 32 and the cylindrical roller 40. At this time, the proximal end side of the cylindrical roller 40 is in contact with the lower end portion of the inclined portion 63 b, and the tapered roller 38 is separated from the flange 17.

  In step S13, the second hemming process is started by rolling the guide roller 32 while engaging the second groove 54. At the beginning of the second hemming process, the flange 17 is not bent because the tapered roller 38 is separated.

  In step S14, when the guide roller 32 is rolled while being engaged with the second groove 54, and the cylindrical roller 40 is kept rolling while being in contact with the inclined portion 63b, the inclined portion 63b is gradually lowered. As shown in FIG. 13, the taper roller 38 comes into contact with the end of the flange 17 and the bending process is resumed. As the hemming unit 20 is moved, the inclined portion 63b is further lowered, so that the angle at which the flange 17 is bent becomes a steeper angle.

  In step S15, when the hemming unit 20 moves to a place without the inclined portion 63b, the flange 17 is pressed by the cylindrical roller 40 and bent until it contacts the surface of the wheel arch portion 16, as shown in FIG. That is, the flange 17 is further bent by 45 ° from the first hemming step and 90 ° from the initial angle.

  Since the second groove 54 is provided on the back surface 49b side of the mold plate 49, the flange 17 and the mold plate 49 are sandwiched between the cylindrical roller 40 and the guide roller 32 and reliably pressed, and the applied pressure is other than that. There is no stopper that restricts the applied pressure without being distributed at the location, and acts on the flange 17 in a concentrated manner. Thereby, the flange 17 is bent reliably.

  In this way, as shown in FIG. 15, the hemming roller 30 rolls while being displaced in a direction (Y direction) orthogonal to the extending direction (Z direction) of the flange 17, depending on the machining location. Thus, the bending angle of the flange 17 can be adjusted. Therefore, the end portion of the flange 17 is not processed, and remains in a state of standing at 90 ° with respect to the surface of the wheel arch portion 16, and the bending angle gradually becomes steep along the extending direction of the flange 17. The portion where there is no portion 63a is bent at approximately 90 °. Since the bending angle of the flange 17 changes gently along the extending direction, stress is not concentrated locally or the amount of processing is not excessively large, thereby preventing the occurrence of wrinkles and cracks. it can.

  Although detailed explanation is omitted, the cylindrical roller 40 rides on the inclined surface of the inclined portion 63 a at the other end of the flange 17, and the cylindrical roller 40 is gradually separated from the flange 17. Therefore, similarly to the end portion on the processing start side, the flange 17 is processed so that the bending angle gradually becomes steeper along the extending direction.

  In step S <b> 16, the distance between the hemming roller 30 and the guide roller 32 is slightly separated from the moving mold 18. Further, the hemming unit 20 is once separated from the moving mold 18.

  In step S17, the moving mold 18 is opened. That is, after changing the direction of the hemming unit 20, the knob 56 is gripped by the chuck 34 by approaching the back surface 49 b, and the suction of the pipe 60 is finished.

  In step S18, standby processing is performed. That is, the robot 22 is moved to a predetermined standby position, and the moving mold 18 is separated from the vehicle 12. The controller 24 notifies the production management computer that the hemming process has been completed normally. Upon receipt of the notification, the production management computer confirms that other predetermined requirements have been met, drives the production line 14, and transports the vehicle 12 that has undergone hemming to the next step.

  Thus, according to the hemming processing apparatus 10 and the processing method, by rolling the hemming roller 30 in a direction (Y direction) orthogonal to the extending direction of the flange 17, the flange 17 according to the processing location is rolled. By adjusting the bending angle, the shape change becomes gradual and the occurrence of wrinkles and cracks can be prevented. At this time, the adjustment of the displacement of the hemming roller 30 can be easily performed by providing the inclined portions 63 a and 63 b whose height changes in the extending direction of the flange 17. Since the flange 17 is free from wrinkles and cracks, it is maintained at a high strength.

  Next, a moving mold 100, which is a modification of the moving mold 18, will be described with reference to FIGS. In the following description, the same components as those in the hemming apparatus 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 16, the moving mold 100 is configured with a mold plate 49 as a base, and an outer arc portion 102 and a first groove 104 provided in parallel along the outer arc portion 102 on the back surface 49b. And the second groove 106, the knob 56, the three suction mechanisms 58, the pipe 60, and the two positioning pins 62. The outer arc portion 102, the first groove 104, and the second groove 106 are portions corresponding to the outer arc portion 50, the first groove 52, and the second groove 54.

  The lower end portions 102a and 102b of the outer circular arc portion 102 project in a direction away from the flange 17 (arrow A2 direction). The outer arc portion 102 other than the lower end portions 102a and 102b has the same shape as the outer arc portion 50 described above.

  The first groove 104 and the second groove 106 are provided in parallel with the outer arc portion 102, and both end portions (separating portions) 104a, 104b, 106a, 106b (that is, the locations of the lower end portions 102a and 102b) The arch portion 16 extends in the direction of arrow A2. In places other than the two end portions 104a, 104b, 106a, 106b (parallel portions), the first groove 104 and the second groove 106 are in the same positions as the first groove 52 and the second groove 54 described above.

  The moving mold 100 configured as described above is transported to the vicinity of the vehicle 12 as a work by the robot 22 and attached to the position of the suction mechanism 58 in the same manner as the moving mold 18 described above. Fixed. Thereafter, the first hemming process is performed by rolling while the guide roller 32 is engaged with the first groove 104, and the second hemming process is performed by rolling while the guide roller 32 is engaged with the second groove 106.

  At the first and last time when the first hemming process is performed, as shown in FIG. 17, since the first groove 104 is considerably separated from the flange 17, the hemming roller 30 does not contact the flange 17, and the flange No. 17 is kept 90 ° upright.

  In the first hemming process, when the hemming unit 20 is slightly moved from the first time point, the first groove 104 is formed so as to gradually approach a parallel position with respect to the flange 17, so as shown in FIG. The taper roller 38 comes into contact with the end of the flange 17 and bending is started. As the hemming unit 20 is moved, the first groove 104 further approaches the flange 17, so that the angle at which the flange 17 is bent gradually becomes steeper. Thereafter, since the first groove 104 is located at the same position as the first groove 52, the taper roller 38 bends the flange 17 in an inward direction by 45 °. Even in the final portion of the processing, the first groove 104 is formed so as to be gradually separated from the parallel position with respect to the flange 17, so that the taper roller 38 is gradually separated from the flange 17.

  On the other hand, in the case of performing the second hemming process, as in the case of the first hemming process, the standing state of the flange 17 is maintained at the first and last time points, and the central portion is bent at an angle of 90 ° inward. Thus, in the hemming processing method using the moving mold 100, the hemming roller 30 rolls while being displaced in the direction (X direction) perpendicular to the extending direction (Z direction) of the flange 17. The bending angle of the flange 17 can be adjusted according to the location. Therefore, as in the case where the moving mold 18 is used, the flange 17 has a gradual change in shape and can prevent wrinkles and cracks from occurring. At this time, the adjustment of the displacement of the hemming roller 30 can be easily set by the arrangement of the first groove 104 and the second groove 106.

  In the above example, the hemming roller 30 is moved in the direction orthogonal to the extending direction of the flange 17 (X direction or Y direction) by the inclined portions 63a and 63b or both ends 104a, 104b, 106a and 106b of the first groove 104 and the second groove 106. However, the means for displacing the hemming roller 30 is not limited to this. For example, the hemming roller 30 itself may be displaced by a servo motor or the like while a displacement amount is fed back by a predetermined sensor.

  Further, although the means for transporting the moving mold 18 and the means for moving the hemming unit 20 are shared by one robot 22, the function as the transporting means of the moving mold 18 and the movement of the hemming unit 20 are used. Functions as means may be shared by individual robots. Furthermore, the method of bending the flange 17 is not limited to a method of simply bending inward, and the flange 17 may be bent so as to sandwich a predetermined inner panel or the like.

  The hemming processing method and the processing apparatus according to the present invention are not limited to the above-described embodiments, and it is needless to say that various configurations and processes can be adopted without departing from the gist of the present invention.

It is a perspective view of the hemming processing apparatus concerning this embodiment. It is a perspective view of the hemming unit provided in the front-end | tip of a robot with the hemming processing apparatus which concerns on this embodiment. It is a perspective view of the movement metal mold | die fixed to the wheel arch part. It is a perspective view of the movement metal mold | die seen from the surface side. It is a section side view of an adsorption mechanism. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at the end of the flange in the first hemming step. It is a flowchart (the 1) which shows the procedure of the hemming processing method by the hemming processing apparatus which concerns on this embodiment. It is a flowchart (the 2) which shows the procedure of the hemming processing method by the hemming processing apparatus which concerns on this embodiment. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at a position slightly moved from the end of the flange in the first hemming step. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at the center of the flange in the first hemming step. It is a partial cross section perspective view of the wheel arch part, hemming roller, and guide roller of a vehicle at the time of performing the 1st hemming process. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at the end of the flange in the second hemming step. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at a position slightly moved from the end of the flange in the second hemming step. It is a cross-sectional side view of a flange, a hemming unit, and a moving mold when the hemming unit is located at the center of the flange in the second hemming step. It is a partial cross section perspective view of the wheel arch part, hemming roller, and guide roller of a vehicle at the time of performing the 2nd hemming process. It is a perspective view of the movable metal mold | die which concerns on the modification fixed to the wheel arch part. When using the moving metal mold | die which concerns on a modification, it is a cross-sectional side view of a flange, hemming unit, and a moving metal mold when a hemming unit is located in the edge part of a flange in a 1st hemming process. When using the moving metal mold | die which concerns on a modification, it is a cross-sectional side view of a flange, a hemming unit, and a moving metal mold when the 1st hemming unit has moved a little from the edge part of the flange.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Hemming processing apparatus 12 ... Vehicle 16 ... Wheel arch part 17 ... Flange 18, 100 ... Moving mold 20 ... Hemming unit 22 ... Robot 30 ... Hemming roller 32 ... Guide roller 38 ... Taper roller 40 ... Cylindrical roller 49 ... Mold plate 49a ... front surface 49b ... back surface 52, 104 ... first groove 54, 106 ... second groove 58 ... suction mechanism 63a, 63b ... inclined portion (distance limiting portion)
66 ... Gripper 67a ... Adsorption part 67b ... Base part 104a, 104b, 106a, 106b ... Both ends

Claims (3)

A hemming method in which a flange of a workpiece is bent with a roller toward the inside of the workpiece,
A hemming method comprising rolling the roller in the extending direction while displacing the roller in a direction orthogonal to the extending direction of the flange. A hemming device that bends the flange of the workpiece toward the inside of the workpiece with a roller;
Outside the end portion of the workpiece, the flange protrudes in a standing direction, and has a distance limiting portion that contacts the roller,
The hemming apparatus according to claim 1, wherein the distance limiting portion has an inclined surface whose height changes in the extending direction. A hemming device that bends the flange of the workpiece toward the inside of the workpiece with a roller;
A guide portion for guiding the roller;
The guide portion includes a parallel portion extending parallel to the flange;
The start portion and / or the end portion where hemming is performed with respect to the flange so that the roller gradually approaches or separates from the flange, and the roller is separated toward the outer side of the workpiece as compared with the parallel portion. A separating portion to be
A hemming apparatus characterized by comprising:

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