JP3074133B2 - Assembly method for body parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling method applied to a subassembly of a vehicle body part.

[0002]

2. Description of the Related Art Conventionally, sub-assemblies of body parts are
Assembly is performed by the method shown in FIG. That is, the first assembling area 101 is an area for assembling the vehicle body component AP including the works A0 to A2 accommodated in the pallet 106, respectively. In the first assembly area 101, works A0 to A5 constituting the vehicle body part AP are provided.
Exclusive welding jig 10 that can be used only for assembling A2
4 and the spot welding device 105
And a pallet 109 for finished parts.

Further, second and third assembly areas 102,
Similarly, a vehicle body part 103 includes workpieces B0 to B2 and C0 to C2 stored in a pallet 106, respectively.
It is an area where P and CP are assembled, and each work B0
Exclusive welding jigs 107 and 108 that can be used only for assembling B2 and C0 to C2 are arranged, and a spot welding device 105 and a pallet 109 are arranged. In the case of body parts which are arranged on the left and right sides of the body like pillars and have different left and right specifications, each area 101
Reference numerals 103 to 103 each include two areas for R (right) and L (left). In such a configuration, in the first assembly area 101, after the worker M sets the works A0 to A2 at predetermined positions of the dedicated welding assembly jig 104, it is visually confirmed whether or not the necessary work is set. The workpieces A0 to A2 are welded by using the spot welding apparatus 105. Subsequently, the welded workpiece is hit with a hammer or the like to check whether welding has been properly performed.
Thereafter, the completed assembly part AP is detached from the dedicated welding assembly jig 104 and accommodated in the completed part pallet 109.

[0004] Also, second and third assembly areas 102, 1
03, and the worker M has the work B0
After setting B2 and C0 to C2 at predetermined positions of the dedicated welding assembly jigs 107 and 108, it is visually checked whether a required work is set, and the spot welding apparatus 10 is set.
5, the workpieces B0 to B2 and C0 to C2 are welded. Subsequently, the welded workpiece is beaten to check whether or not the welding has been properly performed. Thereafter, the completed assembly parts BP and CP are attached to dedicated welding assembly jigs 107 and 108.
And stored in the pallet 109. Each body part AP, BP, CP housed in each pallet 109
Is transported by a forklift to a predetermined location on a line and assembled to a vehicle body.

[0005]

However, in such a conventional method of assembling body parts, each area 1
For each of 01 to 103, the worker M not only sets and welds on the jig, but also checks the welding quality of the finished part to complete the vehicle body part. In addition, since this welding quality check is performed based on whether or not the worker hits the work with a hammer or the like to drop the work, the work load of the worker M is large, and the spot welding device is provided for each area. Since the 105 must be arranged, the equipment cost must be increased. Furthermore, each area 1
Since the number of body parts AP to CP depending on the work speed of the worker M is completed for each of 01 to 103, the management of completed body parts becomes complicated, and the completed body parts are transported by forklift for each area. Therefore, the transfer route becomes complicated and the transfer efficiency is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above-described problems, and has been made in consideration of the above circumstances. It is intended to provide an assembling method.

[0007]

According to the present invention, there is provided a temporary fixing step of temporarily fixing a plurality of workpieces while positioning the plurality of workpieces, and a plurality of temporary fixing steps in the temporary fixing step. A transporting step of transporting a body part made of a work in a state of being sequentially supported on a hanger, and a checking step performed during this transporting step to check whether the body part has a predetermined plurality of workpieces, By performing a welding step of welding and joining the work constituting the vehicle body part after the checking step is supported by the hanger, the work is executed simultaneously with the welding step, and by measuring the temperature distribution of the vehicle body part, A welding quality confirmation step for confirming the appropriateness of the welding connection position and the welding state, and a vehicle body part having been subjected to the welding step and the welding quality confirmation step are separated from the hanger. And a and unloading process.

In the above structure, in the temporary fixing step, a plurality of works are positioned using a jig or the like, and each work is temporarily fixed using a rivet or the like. Next, in the transporting step, the vehicle body parts composed of the plurality of temporarily fixed works are transported while being sequentially supported on the hanger. Then, a checking step and a welding step are performed during the transporting step. In the checking step, it is checked whether or not the vehicle body component has a plurality of predetermined works. Further, in the welding process, the work constituting the vehicle body component that has been checked is welded and connected while being supported by the hanger. Further, a welding quality check step is performed simultaneously with the welding step, and the temperature distribution of the vehicle body parts is measured using an infrared radiation thermometer or the like, thereby confirming the suitability of the welding joint position and the welding state. Then, in the final unloading step, the vehicle body components that have completed the welding step and the welding quality check step are separated from the hanger.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the method of assembling body parts according to the present embodiment is performed in a temporary fixing step A, a transport step B from the temporary fixing step A to the unloading step F, and the transport step B. It comprises a check step C, a welding step D and a welding quality confirmation step E.

In the area where the temporary fixing step A is performed,
As shown in FIG. 2, pallets 1 and 2 accommodating sub-workpieces W1 and W2 to be assembled to the main work W0 are arranged, and a temporary fixing stand 4 is arranged. A positioning hole 3 is formed in each of the works W0 to W2, and a temporary fixing device 5 is disposed on the temporary fixing table 4 at a position corresponding to each of the holes 3 of the main work W0.

The temporary fixing device 5 has a TIG (Tungs)
(Ten Inert Gas arc), and has a cylindrical housing 6 as shown in FIG. A top plate 7 made of a circular conductor is provided on the upper surface of the housing 6, and a locating pin 8 made of ceramic which is an insulator is provided at the center of the top plate 7.
Is erected. A gas tube 10 to which an inert gas is supplied from a gas cylinder 9 is connected to a lower end peripheral portion of the locate pin 8, and a minus terminal 11 is connected to a lower end surface.

As shown in FIGS. 4 to 6, the negative terminal 11 is provided with a conductor 12 disposed inside the locate pin 8.
At the upper end of the conductor 12, a negative electrode 14 is provided which extends in the horizontal direction and both ends of which are exposed to the outside through cutout holes 13, 13 (see FIG. 3). . A passage 15 communicating with the gas tube 10 is provided between the conductor 12 and the inner peripheral wall of the locate pin 8, and an upper end of the passage 15 is provided with the notch hole 1.
3 to the outside.

A pair of positioning magnets 17 and 17 and positive electrodes 18 and 18 are disposed on the top plate 7 and on the periphery of the locating pin 8 at opposing portions. The positioning magnets 17, 17 and the positive electrodes 18, 18 are members having the same height slightly below the negative electrode 14. The positive electrodes 18 are connected to a positive terminal 16.

On the other hand, the transporting process B, which is composed of a path from the temporary fixing process A to the unloading process F, includes the processes shown in FIGS.
As shown in FIG. 1, an overhead trolley conveyor 20 is arranged. This overhead trolley conveyor 20
Has a frame 21 at the upper end as shown in FIG.
The upper end of the frame 21 is fixed to a predetermined part of the factory house. A rail 22 extending from a temporary fixing step A to an unloading step F is fixed to the lower end of the frame 21. A plurality of hangers 23 are mounted on the rail 22.

Each hanger 23 is self-propelled, and has a pair of rollers 24 arranged in the rail 22 and driven by driving means (not shown). A suspending member 25 is supported between the pair of rollers 24, and a loading magnet 26 is fixed to a lower end of the suspending member 25 with its side surface exposed. A guide 27 is arranged on one surface side of the loading magnet 26, and the guide 27 is fixed to both ends of the frame 21 and provided over the entire length of the rail 22. Therefore, as shown in FIG. 8A, the hanger 23 magnetically attaches the vehicle body component P to the other surface of the loading magnet 26,
It is possible to move along the rail 22 while magnetically adhering and slidingly contacting one surface of the guide 27. At this time, since the loading magnet 26 is magnetically attached to the guide 27, the swing of the hanger 23 and the vehicle body component P is prevented.

In the check step C, a television camera 28 is arranged as shown in FIG. 7, and an image signal from the television camera 28 is supplied to a matching device (not shown). The matching device stores image data of each vehicle body part conveyed by the overhead trolley conveyor 20, that is, image data of each vehicle body part to which a predetermined work is properly mounted. Therefore, the matching device compares the image based on the image data sent from the TV camera 28 with the image of each vehicle body component based on the image data stored in advance, so that the image passing through the TV camera 28 is now passed. It is possible to determine whether the determined body part has any specification and whether the work is properly mounted, and sends a signal indicating the determination result to a control device of each robot described later.

On the other hand, in the welding step D, a work clamp robot 29 and a welding robot 30 are arranged as shown in FIG. The work clamp robot 29 is a robot for fixing the body part P when welding, and the welding robot 30 has a configuration in which a spot gun 32 is mounted on an arm of a general-purpose robot 31. When the matching device in the checking step C notifies that the parts are properly mounted and transmits a signal indicating the specification of the body part P, the body part P is connected to the welding step D. When reaching the work clamp robot 29
While being hung and supported by the hanger 23,
The vehicle body part P is clamped. Subsequently, the welding robot 30 operates to perform spot welding at a welding temperature (nugget temperature), a welding pattern, a welding sequence, and the number of spots corresponding to the specification indicated by the transmitted signal. When a signal indicating that the workpiece is not properly mounted is transmitted from the matching device, the workpiece clamping robot 29 and the welding robot 30 are not attached even if the vehicle body part P reaches the welding process D. Does not work, and therefore the vehicle body part P
Pass through the welding process D without being welded.

As shown in FIG. 9, a detector 33 of the infrared thermal image analysis system is provided in the welding quality confirmation step E, and data from the detector 33 stores analysis software. Is transferred to the personal computer 34. As an infrared radiation temperature system composed of the detector 33 and a personal computer 34 storing analysis software, when heat is applied to a substance, molecules cause thermal vibration, and electrons constituting the substance vibrate to generate electromagnetic waves. Is radiated to the outside as heat energy. The emitted electromagnetic wave has a wavelength longer than red of visible light, that is, an infrared ray, and the detector 33 detects the infrared ray from the vehicle body part P and sends it to the personal computer 34. Then, the personal computer 34 operates according to the analysis software, and the body part P is displayed on the screen.
The color is changed according to the temperature of each part of the vehicle body part P
Display the image. Therefore, the change in the color of each part of the displayed image causes the welding temperature (nugget temperature) to change.
Is appropriate, whether the welding pattern is appropriate and has the prescribed pitch, whether the welding sequence is appropriate and is in accordance with the prescribed order, the number of dots is appropriate and It can be determined whether there is any damage. And
If the welding temperature, the welding pattern, the welding sequence, and the number of dots are all appropriate, or if any of them is inappropriate, a signal indicating appropriateness or inappropriateness is transmitted from the personal computer 34 to the unloading step F.

In the unloading step F, as shown in FIG. 10, a carry-in conveyor 35 and a carry-out conveyor 36 are provided. A pallet 37 is disposed at the intersection of the conveyors 35 and 36, and an unloading robot 38 is disposed near the pallet 37. When a signal indicating that the welding temperature, the welding pattern, the welding sequence, and the number of dots are all appropriate is transmitted from the welding quality confirmation step E, the unloading robot 38 removes the vehicle body part P from the welding quality confirmation process E. When reaching the loading step F, the vehicle body part P is detached from the hanger 23 and stored in the pallet 37.

However, when a signal indicating that any one of the welding temperature, the welding pattern, the welding sequence, and the number of hits is not appropriate is transmitted from the welding quality confirmation step E, the vehicle body part P is disengaged. When the vehicle reaches the loading process F,
Is detached from the hanger 23 and then stored in a predetermined portion outside the pallet 37. Also, when a signal indicating that the work is not properly mounted is transmitted from the matching device, when the vehicle body part P reaches the unloading step F, the vehicle body part P is removed from the hanger 23. After being detached, it is stored in a predetermined portion outside the pallet 37. Therefore, the pallet 37 accommodates only the vehicle body parts P on which the workpiece is properly mounted and the welding temperature, the welding pattern, the welding sequence, and the number of hits are all properly welded.

In the present embodiment according to the above configuration, the worker performs the temporary work A in the main work W0.
Hole 3 is inserted into a predetermined locating pin 8 provided in each temporary fixing device 5 of the temporary fixing table 4, and then the sub-work W
The holes 1 and 2 are inserted into the predetermined locate pins 8. Then, as shown in FIG. 4, in a state where the main work W0 and the sub-work W1 (or W2) overlap, the main work W0 is magnetically attached to the positioning magnet 17 and positioned. In this state, when the operator operates a foot-operated switch (not shown), an arc is generated from the plus electrode 18 side to the minus electrode 14 side, and the main work W0 and the sub-work W1, W2 are formed in an inert gas atmosphere. It is welded at the periphery of the hole 3. As a result, as shown in FIG. 7, a vehicle body part P obtained by temporarily fixing the sub works W1 and W2 to the main work W0 is obtained, and the worker is temporarily fixed to the plurality of works W0, W1 and W2. After the body part P is detached from the locate pin 8, it is loaded on the hanger 23 as shown in FIG.
Then, the hanger 23 on which the body parts P are loaded starts to move from the temporary fixing step A to the unloading step F by itself.

When the hanger 23 on which the body parts P are loaded reaches the check step C, the TV camera 28
Captures the arrived body part P and sends the image signal to the matching device. Then, the matching device compares the image based on the image data sent from the television camera 28 with the image of each vehicle body part P based on the image data stored in advance, and has just passed in front of the television camera 28. It is determined whether the body part P has any specification and whether the workpiece is properly mounted, and a signal indicating the determination result is transmitted to the work clamp robot 29, the welding robot 30, and the unloading robot 38. To each control unit.

Then, when the body part P arrives at the welding process D, the workpiece clamping robot 29 clamps the workpiece and stops the movement if the workpiece is properly mounted. At this time, since the one surface side of the loading magnet 26 is in contact with and magnetically attached to the guide 27, the swing of the body part P magnetically attached to the loading magnet 26 is prevented, and the body part P Can be easily clamped. When the clamping by the work clamp robot 29 is completed, the welding robot 30 continues to operate, and the spot gun 32 spot-welds the two sub-workpieces W1 and W2 to the main work W0.

At this time, since the welding robot 30 has obtained the information on the specification of the vehicle body part P from the matching device, the welding robot 30 performs the above-described temporary fixing process A in the above-mentioned temporary fixing step A so that the vehicle body part having different specifications is formed by combining different works. , The welding can be carried out appropriately by using a welding temperature (nugget temperature), a welding pattern, a welding sequence, and the number of spots according to the vehicle body components of each specification. Therefore,
Even in the case of spot-welding body parts having different specifications, there is no need to arrange a welding device for each area as in the related art described with reference to FIG. And equipment cost can be reduced.

When spot welding is started by operating the welding robot 30 as described above, the detector 33 detects infrared rays in real time and sends the data to the personal computer 34. Then, the personal computer 34 operates according to the analysis software, and changes the color on the screen according to the temperature of each part of the body part P to display an image of the body part P. Further, the personal computer 34 determines whether or not the welding temperature (nugget temperature) is appropriate, whether or not the welding pattern is appropriate and has a predetermined pitch, based on the change in color of each portion of the displayed image. It is determined whether or not the welding order is proper and in accordance with a predetermined order, and whether or not the number of hit points is proper and there is no damage, and a signal indicating proper or inappropriate is given to the unloading robot 3.
8 to the control unit.

In the welding process D, the vehicle body part P
Are completed, the work clamp robot 29 releases the clamping of the vehicle body part P, whereby the vehicle body part P moves to the unloading step F while being supported by the hanger 23. Then, the unloading robot 38 removes from the hanger 23 the vehicle body part P to which a signal indicating that the welding temperature, the welding pattern, the welding sequence, and the number of dots are all appropriate from the welding quality confirmation step E is transmitted. After that, it is stored in the pallet 37. However, with respect to the body part P to which a signal indicating that any one of the welding temperature, the welding pattern, the welding sequence, and the number of hits is inappropriate is sent to the hanger 2.
After being detached from the pallet 37, the pallet 37 is stored in a predetermined portion outside the pallet 37. In addition, even when a signal indicating that the work is not properly mounted is transmitted from the matching device, after the vehicle body part P is detached from the hanger 23,
The pallet 37 is stored in a predetermined portion outside the pallet 37.

Therefore, the pallet 37 is properly mounted with a workpiece, and the welding temperature, the welding pattern, the welding sequence, and the number of spots are all properly welded.
Only are accommodated. When the pallet 37 is filled with the appropriate body parts P, the unloading conveyor 36 is operated to transport the pallet 37 in the main line direction (not shown), and the unloading conveyor 35 is operated to empty the pallet 37. The pallet 37 is transferred to the vicinity of the unloading robot 38.
At this time, as described above, when the body parts of different specifications composed of a combination of different workpieces are assembled in a mixed flow state, the unloading robot 38 uses the body parts from the matching device of any specification. Based on the signal indicating whether there is, the vehicle is classified into a plurality of pallets and the body parts are accommodated for each specification.

Therefore, unlike the related art, it is not necessary to transport a completed vehicle body part by a forklift from a plurality of scattered areas, and the transport path can be simplified. When one type of body part is assembled, the number of times of operation of the unloading robot 38 is simply counted. When body parts of different specifications are assembled in a mixed state, unloading is performed for each part type. By counting the number of times the robot 38 is operated, the completed vehicle body parts can be easily managed, and the management of the completed vehicle body parts can be simplified. FIG.
Shows a temporary fixing device 40 used in the temporary fixing step A in another embodiment of the present invention. That is, the work table 41 forming the upper surface of the temporary fixing table 4
Has an assembling hole 42 at a position corresponding to each hole 3 of the main work W0. This mounting hole 42
A pair of electromagnets 4
3, 43 are arranged. A pair of guides 44, 44 are vertically arranged between the two electromagnets 43, 43. Bend pieces 44a, 44a which can be elastically deformed upward are provided at the upper ends of the guides 44, 44. Gap 45
Is provided.

Further, a caulking rod 46 is loosely inserted between the two guides 44, 44.
Project outside through the gap 45. At the upper end of the caulking rod 46, a pointed portion 47 and the pointed portion 47
A large diameter portion 48 is formed at a lower portion of the large diameter portion 48.
A small-diameter portion 49 having a smaller diameter is formed at the lower part of.
The caulking rod 46 is movable in the vertical direction along the axis, is linked to a vertical drive mechanism (not shown), and a plurality of rivets 50 are fitted in the small diameter portion 49. The vertical drive mechanism is configured to start operating by operating a foot-operated switch (not shown).

In this configuration, when the work is temporarily fixed, the uppermost rivet 50U is used as shown in FIG.
Is made to stand by projecting above the work table 41, and in this state, the hole 3 of the main work W0 and the holes 3 of the sub-work W1, W2 are sequentially inserted through the tip of the caulking rod 46. Then, as shown in FIG. 12A, the holes 3 of the main work W0 and the sub-work W1 (or W2) are
After passing through the pointed portion 47 and the large diameter portion 48, it reaches the periphery of the uppermost rivet 50U, and both works W0, W1
(Or W2) In an overlapping state, it is magnetically attached to the positioning magnet 17 and positioned.

Next, when the switch is operated, the drive mechanism operates and the swaging rod 46 starts to descend.
The uppermost rivet 50U abuts the bent pieces 44a, 44a to prevent downward movement. Therefore, as shown in FIG. 12B, the swaging rod 46 descends while the rivet 50U remains in the hole 3 of the work W0, W1 (or W2). Therefore, as shown in FIG. 3C, the rivet 50U swells and deforms in the radial direction as it passes through the large-diameter portion 48, and the outer peripheral portion is formed around the peripheral portion of the hole 3 of the work W0, W1 (or W2). To be crimped.

Then, when the caulking rod 46 reaches the predetermined lowermost position and comes out of the rivet 50U, FIG.
As shown in FIG.
The work W0,
W1 (or W2) is temporarily fixed. When the caulking rod 46 reaches the lowermost position, the uppermost rivet 5
The next rivet 50 located immediately below 0U is at the top, and the rivet 50 projects above the work table 41 in the same manner as described above, and waits for the temporary fixing of the next work.

FIG. 13 shows a self-propelled hanger 51 used in the conveying step B according to another embodiment of the present invention. Roller 2 driven by means
Four. The suspension member 5
2 are supported, and the chain 5
The clamper 54 is engaged via the third or the like. The clamper 54 has a fixed claw 55 and a movable claw 57 pivotally supported by a base end portion of the fixed claw 55 and urged in the opening direction by a spring 56. The claws 55 and 57 face each other. Elastic bodies 58, 58 are attached to the lower end. A lock lever 59 is rotatably supported in the vicinity of the pivotal support of the movable claw 57, and a cam 60 that comes into pressure contact with the upper surface of the movable claw 57 as the lock lever 59 rotates is attached to the base end of the lock lever 59. Is fixed.

In this configuration, when the plurality of workpieces having undergone the temporary fixing step A are to be transported to the temporarily fixed vehicle body part P, the movable claw 57 is kept in an open state to wait. After inserting the upper end of the body part P, the lock lever 59 is rotated downward. Then, the cam 60 rotates integrally with the lock lever 59 and the movable claw 5
7, and the movable claw 57 also rotates in the same direction. Therefore, the upper end of the vehicle body part P is
Between the lower end of the movable claw 57 and the lower end of the movable claw 57.
, And the vehicle body part P in a temporarily fixed state can be transported. Further, when the unloading step F is reached, if the lock lever 59 is rotated upward, the holding of the body part P is released.

FIG. 14 shows another embodiment of the hanger. A pair of substantially J-shaped hooks 61 are provided at a lower end portion of the hanger at appropriate intervals. Is covered with a tube 62 made of an elastic material. On the other hand, projecting pieces 63, 63 protruding to both sides are provided at the upper end of the body part P formed by temporarily fixing a plurality of workpieces after the temporary fixing step A is completed. Therefore,
In this embodiment, the conveyance can be started by an easy operation of locking the protruding pieces 63, 63 of the vehicle body part P to the hooks 61, after completing the temporary fixing step A. At this time, since the hooks 61 are covered with the tube 62 made of an elastic body, the vehicle body parts P are not damaged. Also, in the unloading retreat F, the hook 61,
Unloading can be performed by an easy operation of detaching the protruding pieces 63 from the 61.

[0036]

As described above, according to the present invention, when a plurality of works are welded, the temperature distribution is measured to confirm the welding connection position and the appropriateness of the welding state. Therefore, it is not necessary for the operator to hit the work to check the appropriateness of the welding state, thereby reducing the labor burden on the operator. Further, since the welding is performed while the temporarily fixed work is being conveyed, it is not necessary to arrange a welding device for each area as in the related art, and the equipment cost can be reduced. Furthermore, since the body parts after welding are concentrated in the unloading process, which is the final step of multiple processes, even if the body parts with different specifications are processed in a mixed state, the management of the finished body parts is easy. At the same time, the route for transferring the completed vehicle body parts is simplified, so that the transportation efficiency of the completed vehicle body parts can be increased, thereby reducing the management cost and the transportation cost.

Further, according to the present invention, the work is temporarily fixed by arc welding while positioning the work using the locating pin and the magnet, or the rivet is swollen by pulling out the swaging rod while positioning the work with the swaging rod and the magnet. Temporary fixing was performed. Therefore, the temporary fixing operation is also easy, and it is possible to prevent an increase in the labor burden due to the temporary fixing operation.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of the present invention.

FIG. 2 is a perspective view showing work contents in a temporary fixing step.

FIG. 3 is a perspective view of a temporary fixing device.

FIG. 4 is a vertical sectional view of a main part of a temporary fixing device.

FIG. 5 is a vertical sectional view of a main part of the temporary fixing device in a different direction.

6 is a cross-sectional view corresponding to line aa of FIG.

FIG. 7 is a perspective view showing an apparatus configuration in a transport step and a check step.

8A is a vertical sectional view of a hanger, FIG. 8B is a perspective view of a main part, and FIG. 8C is a plan view of a main part.

FIG. 9 is a perspective view showing an apparatus configuration of a transporting step, a welding step, and a welding quality checking step.

FIG. 10 is a perspective view showing an apparatus configuration in an unloading step.

FIG. 11 is a vertical sectional view showing a main part of a temporary fixing device according to another embodiment of the present invention.

FIG. 12 is an operation explanatory view of the temporary fixing device.

FIG. 13 is a perspective view showing a hanger according to another embodiment of the present invention.

FIG. 14 is a perspective view showing a main part of a hanger according to another embodiment of the present invention.

FIG. 15 is a perspective view showing a conventional body part assembly method.

[Explanation of symbols]

 A Temporary fixing process B Transporting process C Checking process D Welding process E Welding quality checking process F Unloading process W0, W1, W2 Work 4 Temporary fixing stand 5 Temporary fixing device 8 Locate pin 14 Negative electrode (one electrode) 17 Positioning magnet ( Magnet) 18 plus electrode (the other electrode) 23 hanger 28 TV camera 30 welding robot 32 spot gun 38 unloading robot 46 caulking rod 47 pointed part 48 large diameter part 49 small diameter part 50 rivet

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI B23P 21/00 303 B23P 21/00 303A

Claims (3)

(57) [Claims] 1. A temporary fixing step of temporarily fixing a plurality of works while positioning the plurality of works, and a conveying step of conveying a body part composed of the plurality of works temporarily fixed in the temporary fixing step while being sequentially supported on a hanger. A check step executed during the transporting step to check whether or not the body part has a plurality of predetermined works; and a work of the body part that has completed the checking step is supported by the hanger. A welding quality check step which is performed simultaneously with the welding step and measures the temperature distribution of the vehicle body parts to check whether the welding connection position and the welding state are appropriate, and the welding step. And an unloading step of detaching the body part having completed the welding quality confirmation step from the hanger. 2. The method according to claim 1, wherein the step of temporarily fixing includes a locating pin made of an insulator and provided with an inert gas ejection portion and one of the electrodes, and is located on the same plane around the locating pin. The temporary fixing is performed by arc welding by electric discharge between the two electrodes while using a temporary fixing device having a magnet and the other electrode to position the work with the locating pin and the magnet. 1. The method of assembling body parts according to 1. 3. A caulking rod in which, in the temporary fixing step, a pointed portion is formed at a tip portion, and a large diameter portion and a small diameter portion are formed successively downward from the pointed portion;
Using a temporary fixing device having a magnet disposed around the caulking rod, the workpiece is positioned by the caulking rod in a state where a rivet is inserted into the small diameter portion and the magnet, and the large diameter portion is pulled out from the rivet. 2. The method of assembling a body part according to claim 1, wherein the rivet is bulged and deformed in the radial direction, and the rivet is pressed against the workpiece to perform the temporary fixing.