JPH11348854A - Reproduction of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reproduction method of disassembling a vehicle body assembled by means of spot-welding or the like by moving a conveyor line backward, and assembling parts to be reproduced and new parts by moving the conveyor line forward. SOLUTION: A vehicle body to be reproduced 100 is put on a station S11 in a conveyor line C, and the conveyor line is moved backward to disassemble front, rear, right, and left doors 70, 75 (doors on opposite side not illustrated), a hood 80, a roof 50, body side members 40, 45, and an engine room 30 or the like. Besides a disassembling means such as removing rivets, bolts, and nuts, the spot-welded parts of the vehicle body are drilled for disassembly. The conveyor line C is moved forward to assemble a new engine room, new body side members 240, 245, and a new roof 250 and so on assembled parts of a rear floor 10 and a floor 20, thus to reproduce a new vehicle body 300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of disassembling and remanufacturing a vehicle body produced by assembling panel parts by spot welding.

[0002]

2. Description of the Related Art FIG. 1 is an explanatory view showing a general process of producing an automobile body. The conveyor line C for body production moves in the direction of arrow F. First station S1
, The rear floor 10 is mounted on a jig mounted on the conveyor. Arrow A indicates that it is an assembly operation. In the second station S2, the floor 20 is attached to the front of the rear floor 10, and the engine room 30 is attached to the front of the floor 20. As this attachment means, spot welding means is used. At the third station S3,
Body side members 40 and 45 are assembled on both sides of the floor by spot welding.

In a fourth station S4, a roof 50 is spot-welded to upper portions of the body side members 40 and 45. In the fifth station S5, the back door 60, front and rear left and right doors 70 and 75 (the opposite door is not shown), and the hood 80 are assembled. These members are assembled using members such as hinges and door catches by using fastening members such as rivets, bolts, and nuts.
At the sixth station S6, other members are assembled, and the vehicle body 100 is completed. The car body is about 30
A zero-point press panel is assembled in a certain order by spot welding of about 3,000 to 4,000 points.

FIGS. 2 and 3 show that a first panel component P1 and a second panel component P2 are temporarily assembled by a jig J1.
A step of assembling by performing spot welding W ₁ is schematically shown. The clamp CR is temporarily assembled with both panel parts P ₁ and P ₂ sandwiched between receiving surfaces or supporting surfaces D. At this time, the relative positioning accuracy of both parts is ensured by the positioning pins L ₁ and L ₂ . Spot welding W ₁ is processed using a welding gun (not shown). Locations that are sandwiched by the clamp CR performs spot welding to remove the workpiece from the jig J _1.

[0005]

Since a vehicle body made on the above-mentioned production line cannot be disassembled in principle because of a welded structure, once the vehicle body is completed, bolts such as doors and fenders are completed. Except for easy replacement of the fastening parts, even when most of the vehicle body can be used at the time of scrapping, the entire vehicle body must be disposed of. That is,
In spite of the fact that many usable parts still remain, the welded structure makes it impossible to disassemble and has to be disposed of, wasting resources. The main functional parts of an automobile include an engine, a transmission, an axle, and the like. These are mainly assembled by bolts and nuts, and are easily disassembled. Therefore, parts can be replaced by repair due to failure or the like.

However, since the vehicle body cannot be disassembled due to the welded structure, there is no way to reuse the vehicle body parts, the vehicle body becomes a bottleneck, and most of the vehicles are discarded without being reused. . Accordingly, the present invention provides a method of disassembling a vehicle body having a welded assembly structure, reusing the usable old and new parts, and reproducing the vehicle body.

[0007]

SUMMARY OF THE INVENTION A method of reproducing a vehicle body assembled by welding according to the present invention includes, as basic means, a step of mounting a vehicle body to be reproduced on a production line for assembling a vehicle body; The process of disassembling the car body while moving the line in the reverse direction, the process of sorting the disassembled parts as remanufactured products, and the recycled parts sorted while moving the production line mounting the selected components in the forward direction The method includes a step of assembling a new part by welding.

The step of disassembling the vehicle body is a step of disassembling the vehicle body by performing drilling on a welded portion of the vehicle body. In order to operate the conveyor in the reverse direction, if the spot welding portion is drilled in the reverse order of the normal welding assembly, it will be disassembled. That is, if the order is the reverse of the assembling order, the assembly can always be disassembled. Drilling is processing that penetrates only one of the two welded parts or processing that penetrates the two welded parts.

Further, the step of assembling by welding is a step of assembling a regenerated part without holes and a new part without holes by spot welding, or plug welding a part with holes and a part without holes. Is an assembly process. The drilling is performed by replacing the spot welding head of the robot arm for spot welding with a drill head.

[0010]

FIG. 4 is an explanatory diagram showing an outline of a production method according to the present invention. The moving direction of the conveyor line C can be changed in the opposite directions of the arrow R and the arrow F, respectively. The upper half of FIG. 4 shows the process of disassembling the vehicle body recovered by moving the conveyor line C in the direction of arrow R.
At the station S11, the vehicle body 100 collected from the market is mounted on the conveyor line C. This car body 1
00 assumes a vehicle body of the same type as that assembled on the production line described in FIG.

At the station S12, the back door 60, front and rear doors 70, 75 (opposite doors are not shown), and the hood 80 are disassembled. Since these parts are assembled with fasteners such as rivets and bolts, the parts are disassembled using a tool such as a wrench driver and a robot. Arrow B indicates that this is a disassembly operation. At station S13, the roof 50 is disassembled. Since the roof 50 is attached to the vehicle body by spot welding means, as will be described later, the roof is disassembled by making a hole in the spot welded portion.

In the station S14, the left and right body side parts 40 and 45 are disassembled. The disassembly is performed by drilling a spot weld. At the station S15, the engine room 30 attached to the front of the floor 20 is disassembled. This disassembly is also performed by performing a drilling process on the spot welded portion.

Next, a process of moving the conveyor line C in the direction of arrow F to reuse the assembly of the floor 20 and the rear floor 10 of the disassembled and recovered vehicle body 100 to produce a new vehicle body will be described. In the station S16, the engine room 230 having the new shape is welded to the front part of the floor 20. This welding means will be described later. Station S17
In, the newly formed body side parts 240 and 245 are welded.

In the station S18, the new shape roof 250 is welded. At station S19,
New shape back door 260, front, rear, left and right doors 270, 2
75, attach the hood 280. These parts are fixed to the vehicle body with bolts or the like. At station S20, other parts are assembled to complete a new-shaped vehicle body 300.

FIG. 5 is an explanatory view showing a disassembling means of a spot weld used in the present invention. Jig J _1, the original AS
M1 is a production of facilities and is mounted on the jig J _1,
The assembled part ASM1 gripped by the clamp CR is a part P
₁ and part P ₂ has a bonding structure by spot welds W _1. Describing the original ASM1, this spot welding process is automatically performed by an NC-controlled welding robot. The welding robot has been previously taught the welding position, moves the welding head to the commanded welding position, and executes spot welding. The spot welded portion is joined by, for example, a fused portion (nugget) having a diameter of about 6 mm.

Therefore, in the present invention, as shown in FIG.
Removed by subjecting the perforated processing H ₁ by a drill DR for this weld. The diameter of the drill DR to be used may be a small diameter drill having a nominal diameter of about 6 mm corresponding to the diameter of the nugget. This drilling can be performed by attaching a drill head to the tip of the arm instead of the welding head attached to the tip of the arm of the welding robot. Since the welding robot memorizes the spot welding locations, the drilling can be automated simply by replacing the drill head with a drill head. In other words, using the production equipment for welding,
It can be disassembled by operating in reverse order and changing the weld to drilled. In other words, if the operation sequence of the original welding robot is changed to a completely reverse operation, and if the welding is further switched to drilling,
The operation program of the welding robot becomes a disassembly program and is disassembled.

[0017] with respect to FIG. 7 parts P ₁ was decomposed, part P ₂
To join the new parts NP ₂ corresponding to the new assembly ASM
FIG. 8 is a cross-sectional view taken along the line XX of FIG. In FIG. 8, (A) shows ASM1,
(B) shows ASM2. Here, the spot welding position K ₁
Is the same position as the spot welding position W ₁ in the original ASM1. This is to reduce costs by using the original production equipment robot program and the like. Providing a jig J ₂ for assembly ASM2, to determine the relative position of the component P _1, parts NP ₂ by using the positioning pins L _1, L _2, is clamped CR. Subjected to spot welding W ₁ to the mating surface in this state, it is possible to obtain a new assembly ASM2.

FIG. 9 shows an example of disassembly and reconnection of the old assembled parts. (A) of FIG. 9 shows a state in which the component P ₁ and the part P ₂ is coupled with nugget WN by spot welding. As shown in (B), the drilling head is attached to the part P.
₂ side by approach, processing the holes H _1, to remove the nugget. The perforated processing, and to the upper surface of the component P _1. Therefore, on the upper surface of the component P _1, slight cutting marks by the drill tip remains. The part P
₁ and part P ₂ is decomposed. (C) is superimposed to the new parts NP ₂ reproduce the parts P ₁ (components to be reused after decomposition), it forms a nugget WN is subjected to spot welding in the same position as the previous spot welding position And shows the reassembled state. Through the above-described steps, a new assembly can be produced by reusing a part of the assembly where the panel is welded.

FIG. 10 shows another example, in which (A),
(B) is a process similar to FIGS. 9A and 9B.
(C) of FIG. 10, to play the part P ₂ superimposed with the new parts NP _1. Or, as shown in Graph 1 (D), causing the can be superposed with the component P ₂ and the new part P ₂ 'of the same shape as the new parts NP _1. Subjected to plug welding WD from the component P ₂ side, to form a welded plug WS, binds. The purpose of this is to repair, rust, dent, damage, etc. the body parts recovered from the market,
Applies when replacement is required.

FIG. 11 shows another example. In (B) of FIG, processing the through hole H ₂ in the weld nugget of the part P ₂ and the part P _1, decompose the component P ₂ and part P _1. By playing the part P _1, to prepare the new parts NP _2. At this time, the new parts N
Keep processing the previously hole H ₃ is the P _2. In (C) of FIG, contact the back side backup plate BP of the component P ₁ equivalent, subjected to plug welding WD from the new parts NP ₂ side, to form a welded plug WS, binds. Since the backup plate BP is used, the present invention can be applied to a case where the thickness of the component is small. Similarly, it is possible to apply the plug welding WD without hole formation in new parts NP ₁ as shown in FIG. (C'). At this time, a backup plate becomes unnecessary.

FIG. 12 shows an example in which one of the parts disassembled by processing the through hole is regenerated and mechanically assembled together with other new parts. (A) of the figure shows an example of coupling the component P ₁ and the new parts NP ₂ rivets RB. The part to be reproduced is the part P
_2, and it may be combined with the new parts NP _1. (B) of the figure shows an example in which a bolt and a nut BM are used as connecting means.

Next, an example will be described in which, instead of disassembling a reconstructed assembly part by drilling, a panel part is cut at an appropriate position by laser means and spot-welded with a new part to regenerate. Figure 13 shows a state in which the component P ₁ is mounted to the jig J _1. By a robot having a laser processing head (not shown), to cut the parts P ₁ along the cutting line LC.

Next, as shown in FIG. 14, be positioned using the locating pin L ₁ playback component P ₁₁ of the cut parts on another jig J _2. On jig J ₂ is, the locating pin L ₂
With new parts NP ₁₁ are mounted, an end portion and a reproducing part P ₁₁ is superimposed. Spot welding W ₁
To produce new assembly parts.

FIG. 15 is a sectional view taken along line XX of FIG.
(A) shows the state before the disassembly, (B) shows the state after the reproduction, and the reproduction part P ₁₁
A superposition state of the new parts NP ₁₁ is shown. As described above, disassembly means such as drilling and laser cutting (LC) can be appropriately selected according to the shape and structure of the assembly part to be regenerated and disassembled. Also, the means for reassembly can be appropriately selected, such as spot welding, plug welding, or a method using mechanical coupling means such as rivets, bolts, and nuts.

[0025]

(1) Reuse of cost-reducing resources by minimizing product disposal and production facility disposal due to model changes. Also, since the product before the model change is remodeled to reflect the model change and add new value, once the vehicle has been produced, the model change can be reflected many times. It is several times longer than it is now, and the function is improved each time. Therefore,
Customers do not lose conventional replacement and disposal losses, socially waste resources, and manufacturers do not lose production equipment due to model changes.

(2) Disassembly of a welded structure is not easy, but in a vehicle body in which spot welding is mostly performed, the spot welded portion is perforated or cut, spot welding is performed when there is no hole, and plug welding is performed when there is no hole. In the case of line cutting, re-assembly becomes possible by using an adhesive by welding with a thin wall or hemming.

(3) At present, production by local procurement in developing countries has increased, but comparing only costs,
If they are of the same model, Japanese cars will lose. If the old model can be remodeled and model changes can be reflected, the production know-how of the mother factory, which has advanced automation, can be used to make the remodeling automation only in this area. Significance increases. In other words, since only the mother factory can carry out mass production for reproduction, it is used twice including the original production, new added value is generated, and cost reduction proceeds.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a general process of producing a vehicle body.

FIG. 2 is an explanatory view of a process of temporarily assembling and welding components with a jig.

FIG. 3 is an explanatory view of a main part of FIG. 2;

FIG. 4 is an explanatory view showing an outline of the production method of the present invention.

FIG. 5 is an explanatory view showing a disassembling means of a spot weld.

FIG. 6 is an explanatory view showing a disassembling means of a spot weld.

FIG. 7 is an explanatory view showing a means for connecting a part to be reproduced and a new part.

FIG. 8 is a sectional view taken along line XX of FIG. 7;

FIG. 9 is an explanatory view showing disassembly and reconnection means of an old assembly part.

FIG. 10 is an explanatory view showing disassembly and reconnection means of an old assembly part.

FIG. 11 is an explanatory view showing disassembly and reconnection means of an old assembly part.

FIG. 12 is an explanatory view showing mechanical coupling means of parts.

FIG. 13 is an explanatory diagram showing an example of cutting a part with a laser.

FIG. 14 is an explanatory view showing reconnection of cut parts.

FIG. 15 is a sectional view taken along line XX of FIG. 14;

[Explanation of symbols]

 Reference Signs List 10 rear floor 20 floor 30 engine room 40, 45 body side member 50 roof 60 back door 70, 75 door 80 hood 100 body 230 new engine room 240, 245 new body side member 250 new roof 260 new back door 270, 275 new door 280 New hood 300 New body

Continuing on the front page (72) Inventor ▲ Susumu Sato, 8 clay bowls in Fujisawa, Kanagawa Prefecture Isuzu Central Research Institute Co., Ltd. (72) Inventor Masaharu Yagura 8 clay bowls in Fujisawa City, Kanagawa Isuzu Motors Fujisawa Plant, Ltd. (72) Inventor Yuichi Kanda 2100, Kurainonakanodai, Kawagoe-shi, Saitama Pref.

Claims (7)

[Claims] 1. A method of reproducing a vehicle body assembled by welding, comprising: mounting a vehicle body to be reproduced on a production line for assembling the vehicle body; and moving the vehicle body in the reverse direction while moving the production line in a reverse direction. Disassembly process, sorting of disassembled parts as remanufactured products, and assembling by welding welding selected recycled parts and new parts while moving the production line mounting the selected parts in the forward direction , A method of reproducing a vehicle body. 2. The method according to claim 1, wherein the step of disassembling the vehicle body is a step of disassembling the vehicle body by perforating a welded portion of the vehicle body. 3. The method according to claim 2, wherein the drilling is a process for penetrating only one of the two welded parts. 4. The method for reproducing an automobile body according to claim 2, wherein the drilling is a process for penetrating the two welded parts. 5. The method according to claim 1, wherein the step of assembling by welding is a step of assembling a recycled part without holes and a new part without holes by spot welding. 6. The method according to claim 1, wherein the step of assembling by welding is a step of assembling parts with holes and parts without holes by plug welding. 7. The method according to claim 2, wherein the drilling is performed by replacing a spot welding head of a robot arm for spot welding with a drill head.