JP3305558B2 - How to assemble a car underframe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling an underframe of an automobile for assembling an underframe by mutually welding a plurality of frame components constituting the underframe.

[0002]

2. Description of the Related Art Conventionally, when a plurality of frame components are welded to each other to form an underframe, each frame component is positioned and held by positioning and holding means, and distortion occurs when the frame components are welded to each other. Is to be avoided.

[0003]

However, as described above, in welding in which each frame component is positioned and held as described above, it is difficult to perform welding by a welding robot because the positioning and holding means hinders the welding. Is hardly good.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances, and has been made to avoid the occurrence of distortion when welding frame components to each other and to obtain an excellent assembling efficiency. It is intended to provide an assembling method.

[0005]

In order to achieve the above object, the present invention provides a plurality of positioning components for positioning and holding a plurality of frame components constituting an underframe so that their relative positions are constant. A step of setting each frame component on a jig pallet provided with holding means, and a step of temporarily welding the welded portions of each frame component to each other to form a temporarily assembled underframe on the jig pallet; sequentially allowed to elapse and a step of applying the welding the welded portions of the underframe temporary assembly state, there at underframe assembling method of a motor vehicle
After the preliminary welding and before the main welding,
Of the specified holding means among the holding means
While maintaining the holding state,
Positioning and holding means other than the means release the positioning and holding state
To evacuate the corresponding frame components,
After the retreat, the specific plurality of positioning and holding means
The temporary assembly state that is positioned and held on the
The main welding is performed on the underframe .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view showing the entire arrangement of an underframe assembling apparatus. FIG. 2 is a plan view showing a jig pallet at a part setting position. 3 is a side view showing the set state of each frame component, FIG. 3 is a plan view taken along the arrow 3 in FIG. 2, FIG. 4 is a vertical sectional side view showing the configuration of the positioning and holding means, and FIG.
FIG. 6 is a plan view taken along the arrow 6 in FIG.

First, in FIG. 1, a jig pallet 10 is carried.
It is circulated by the feeding means 11 and
In the middle of the step 11, the part setting position P_PS, Temporary fixing position P
_TWAnd final stop position P_CWAre set at equal intervals
The jig pallet 10 is located at the part set position.
P_PS, Temporary fixing position P_TWAnd final stop position P_CWIn each
It is transported by the transport means 11 so as to stop once.
You. Moreover, the part setting position P _PSOn both sides of the conveying means 11
Are provided with component supply means 12, respectively.
So as to be located between the component supply means 12 and the transport means 11
And several handling robots 13, 14 ...
And the temporary fixing position P_TWOn both sides of the conveying means 11
Has a plurality of welding robots 15 for performing temporary fixing welding.
… Are arranged, and the final stop position P_CWAnd conveying means 11
Welding robots on both sides of the formal welding
16 are arranged respectively. Thus, the temporary fixing position P_TWso
Under frame 1 temporarily assembled by temporary fixing
7 ', the final stop position P_CWThe final stop welding is applied and assembled
The underframe 17 is in the final stop position P_CWConveyed from
It is conveyed to the next step by the means 11.

[0009] In FIGS. 2 and 3, the component sets the position P _PS, left as a frame component constituting the underframe 17, a pair of right rear side frames 18,
18, rear floor cross member 19, middle floor cross member 20, left and right pair of inside sills 21 and
1, a pair of left and right front floor frames 22, 22,
Dashboard lower 23, left and right pair of front wheel houses 24, 24 and front bulkhead 25
Are sequentially brought onto the jig pallet 10 from the component supply means 12 by the handling robots 13, 14,.

On the jig pallet 10, left and right positions for holding the rear side frames 18, 18 respectively are provided.
.., A pair of positioning and holding means 29 and 29 for positioning and holding the rear floor cross member 19, and a pair of positioning and holding for positioning and holding the middle floor cross member 20. , Means for positioning and holding the inside sills 21 and 21, respectively, and two sets of positioning and holding means 31, 32... For positioning and holding the front floor frames 22, 22 respectively. .., Two pairs of positioning and holding means 33, 34... For positioning and holding the dashboard lower 23, and left and right for positioning and holding the front wheel houses 24, 24. 2 pairs
A pair of positioning and holding means 36, 37, ... and a pair of positioning and holding means 38, 38 for positioning and holding the front bulkhead 25 are provided.
8, the rear floor cross member 19, the middle floor cross member 20, the inside sills 21, 21, the front floor frames 22, 22, the dashboard lower 23, the front wheel houses 24, 24, and the front bulkhead 25 keep their relative positions constant. Is set on the jig pallet 10.

Positioning and holding means 27 and 28 for positioning and holding the rear side frame 18 are provided on the jig pallet 10 for positioning and holding two places spaced apart in front of and behind the rear side frame 18.

Referring also to FIG. 4, the positioning and holding means 27 is provided at the upper end of a column 39 erected on the jig pallet 10 for positioning and holding the rear portion of the rear side frame 18. A cylinder body 40 whose base end is attached to the upper end of the column 39 and extends upward; a piston which is slidably fitted into the cylinder body 40 and penetrates the distal end of the cylinder body 40 in an airtight and movable manner. A piston 41 integrally provided with a rod 41a;
The tip of the piston rod 41a is accommodated in the cylinder body 4
0, and a positioning pin 43 fixed to the tip of the guide cylinder 42 so as to be fittable into a pin hole 18a provided in the rear side frame 18.
And a receiving surface 44a at the front end surrounding the base end of the positioning pin 43 so as to be able to contact the outer surface of the rear side frame 18 around the pin hole 18a.
Cover frame 4 which is fixed to the tip of cylinder body 40 so as to cover 2
4 and a clamp claw 45 swingably connected to the tip of the piston rod 41 a in the guide cylinder 42.

The positioning pin 43 is provided with a guide hole 46 communicating with the inside of the guide cylinder 42 so as to open to both outer sides of the positioning pin 43. The distal end of the clamp claw 45 is housed in the guide hole 46. Is done. Moreover, a guide groove 48 for guiding both ends of the pin 47 attached to the intermediate portion of the clamp claw 45.
Is provided on the inner surface of the guide cylinder 42, and the cylinder body 4
By the operation of the piston 41 in accordance with the control for introducing the air pressure into the inside of the cylinder 0, the clamp claw 45 swings in response to the pin 47 being guided by the guide groove 48. That is, when the piston 41 is moving upward in FIG. 4, the distal end portion of the clamp claw 45 is in a position in which the entirety thereof is accommodated in the guide hole 46 as indicated by a chain line, and the receiving surface 44a is
When the piston 41 is moved downward in a state of approaching and facing the outer surface of the clamp claw 45, a part of the tip thereof is partially inserted into the guide hole 4.
6, the rear side frame 18 is sandwiched between the receiving surface 44a and the clamp claw 45. That is, by the control of the air pressure supply into the cylinder body 40, the rear portion of the rear side frame 18 is detachably positioned and held by the positioning and holding means 27.

The positioning and holding means 28, which is configured in the same manner as the positioning and holding means 27, is capable of positioning and holding the front portion of the rear side frame 18, and includes a piston rod 51 projecting upward from a lifting cylinder 50 having an axis extending vertically. The lifting cylinder 5
0 is disposed on the first support plate 52 so that the position in the front-rear direction can be freely adjusted in a certain range, and the first support plate 52 is capable of freely adjusting the position in the lateral direction in a certain range. 2 is provided on the support plate 53, and the second support plate 53 is
Fixed to 0. Therefore, the positioning holding means 28
Are arranged on the jig pallet 10 so that the front and rear and lateral positions within the restricted range can be adjusted and the vertical position can be adjusted. It is possible to cope with a change in the shape of the positioning member 18 and to retract the positioning and holding means 28 from the rear side frame 18.

A pair of positioning and holding means 29 and 29 for positioning and holding the rear floor cross member 19, a pair of positioning and holding means 30 and 30 for positioning and holding the middle floor cross member 20, and the inside sill 2.
.., And two pairs of left and right positioning and holding pairs for holding the front floor frames 22 and 22 respectively. Means 3
Are configured in the same manner as the positioning and holding means 27 and 28, and the positioning and holding means 28
In the same manner as described above, it is arranged on the jig pallet 10 so that the front and rear and lateral positions within the restricted range can be adjusted and the vertical position can be adjusted.

The positioning and holding means 36 and 37 for positioning and holding the front wheel house 24 are provided on the jig pallet 10 for positioning and holding two front and rear spaced portions of the front wheel house 24. And columns 54 and 55 erected on the jig pallet 10 in the same manner as the positioning and holding means 27 to 34 described above.
Are respectively provided at the upper ends of.

The positioning and holding means 35 for positioning and holding the dashboard lower 23 has the same structure as the above-mentioned positioning and holding means 27 to 34, but has a substantially horizontal axis for engaging and disengaging the dashboard lower 23 from the front. It is provided at the upper end of a piston rod 57 projecting upward from an elevating cylinder 56 having an axis extending vertically. In addition, the lifting cylinder 56 is capable of freely adjusting the position in the front-rear direction within a certain range so that the first support plate 58
The first support plate 58 is disposed on the second support plate 59 so that the lateral position can be freely adjusted within a certain range. The second support plate 59 is provided with a pair of positioning and holding means. 35,
The jig 35 is fixed on the jig pallet 10 in common. Therefore, the positioning and holding means 35 is arranged on the jig pallet 10 so that the front and rear and lateral positions in the restricted range can be adjusted and the vertical position can be adjusted. It is possible to cope with a change in the shape of the dashboard lower 23 accompanying the
3 can be evacuated.

The positioning and holding means 38 for positioning and holding the front bulkhead 25 has a substantially horizontal axis for engaging and disengaging from the front of the front bulkhead 25, similarly to the positioning and holding means 35.
It is provided at the upper end of a piston rod 62 projecting upward from an elevating cylinder 61 having an axis extending vertically. Moreover, the lifting cylinder 61 is disposed on the first support plate 63 so that the position in the front-rear direction can be freely adjusted within a certain range.
The support plate 63 is disposed on the second support plate 64 such that the lateral position can be freely adjusted within a certain range.
Is fixed on the jig pallet 10. Therefore, the positioning and holding means 38 is arranged on the jig pallet 10 so that the front and rear and lateral positions in the restricted range can be adjusted and the vertical position can be adjusted. Front bulkhead 25 accompanying
Can be dealt with, and the positioning and holding means 38 can be retracted from the front bulkhead 25.

Referring to FIG. 3, a pair of left and right rear sides is shown.
Frames 18, 18 and rear floor cross member 19
Are welded to each other at welding portions 65, 65,
Frames 18, 18 and middle floor cross member 20
Are welded to each other at welds 66, 66,
Frames 18, 18, middle floor cross member 20 and
The left and right inside sills 21 and 21 are welded parts 6
7,67 mutually welded, middle floor cross member
20 and a pair of left and right front floor frames 22,
22 are mutually welded at welds 68, 68,
Dosyl 21, 21 and a pair of left and right front wheels
Houses 24, 24 are welded together at welds 69, 69.
And both front wheel houses 24, 24 and both floors
Floor frames 22, 22 are welded 70, 70
Welded to each other, both front wheelhouses 24, 24
And the dashboard lower 23 are mutually connected at the welds 71, 71.
To the front wheel houses 24, 24 and
And the front bulkhead 25 are mutually
Is to be welded. Thus, the temporary fixing position P_TWTransport by
The welding robots 15 arranged on both sides of the means 11 are:
For example, spot welding is applied to each of the welds 65 to 72.
Temporary welding is performed. _CWTransport by
The welding robots 16 arranged on both sides of the feeding means 11 are
For example, multi-spot welding is performed on each of the welding portions 65 to 72.
The main welding is performed.

[0020] Next, to explain the action of this embodiment, in the state in which the jig pallet 10 is stopped temporarily come transported to the part setting position P _PS by the conveying means 11, is left, the right pair frame component Rear side frame 1
8, 18, a rear floor cross member 19, a middle floor cross member 20, a pair of left and right inside sills 21,
21, left and right pair of front floor frames 22, 2
2, dashboard lower 23, left and right pair of front wheel houses 24, 24 and front bulkhead 2
The step of setting 5 on the jig pallet 10 is executed. That is, the rear side frames 18, 18, the rear floor cross member 19, the middle floor cross member 20, and the inside sills 21, 21 sequentially brought on the jig pallet 10 by the handling robots 13, 14,.
1. The front floor frames 22, 22, the dashboard lower 23, the front wheel houses 24, 24, and the front bulkhead 25 are positioned relative to each other by corresponding positioning and holding means 27 to 38 provided on the jig pallet 10. The positions are fixed and held, respectively.

When the jig pallet 10 is conveyed to the temporary fixing position _PTW by the conveying means 11 and once stopped, a step of forming the underframe 17 'in a temporarily assembled state is executed. That is, the rear side frames 18, 18, the rear floor cross member 19, the middle floor cross member 20,
Inside sills 21, 21, front floor frame 2
2, 22, the dashboard lower 23, the front wheel houses 24, 24, and the front bulkhead 25 are temporarily welded to the welded portions 65 to 72 by the welding robot 15. ′ Are formed on the jig pallet 10.

After the temporarily assembled underframe 17 'is formed at the temporary fixing position P _TW , as shown in FIGS. 5 and 6, a specific plurality of positioning and holding means among the positioning and holding means 27 to 38 are used. 27 ..., 36 ..., 37 ...
Then, a step of retracting the other positioning and holding means 28 to 35 and 38 after releasing the positioning and holding state is executed. That is, a pair of positioning and holding means 27, 27 provided at the upper end of the column 39 to position and hold the rear portions of the rear side frames 18, 18, and the front wheel houses 24, 24 provided at the upper ends of the columns 54, 55, respectively.
, Two pairs of positioning and holding means 36 and 37 for positioning and holding the front and rear portions, respectively, are selected as specific plural positioning and holding means to maintain the positioning and holding state, but the other positioning and holding means 28 to 35, Reference numeral 38 indicates a retract operation after the positioning and holding state is released. That is, the positioning / holding means 28, 28 are retracted from the front portion of the rear side frames 18, 18 by lowering and moving diagonally rearward after releasing the positioning / holding state, and the positioning / holding means 29, 29 release the positioning / holding state. Is moved away from the rear floor cross member 19 by lowering and moving forward, and the positioning and holding means 30, 30
Is released from the middle floor cross member 20 by the downward movement after the positioning and holding state is released and the oblique rearward movement, and the positioning and holding means 31 and 31 are lowered and the diagonally forward side after the positioning and holding state is released. The positioning and holding means 32 and 32 are retracted from the front part of the inside sills 21 and 21 by moving down and obliquely rearward after releasing the positioning and holding state. The positioning and holding means 33, 33 are retracted from the rear of the front floor frames 22, 22 by lowering and moving diagonally forward after releasing the positioning and holding state, and the positioning and holding means 34, 34 release the positioning and holding state. After the vehicle has been lowered and moved diagonally rearward, the front floor frame 22 Is allowed retreated from the front of the 22, positioning and holding means 35 and 35 are caused to retreat from the dashboard lower 23 by the movement of the drop and obliquely forward after the release of the positioning hold state, further positioning and holding means 3
8, 38 are withdrawn from the front bulkhead 25 by descending and advancing after releasing the positioning holding state.

As described above, the underframe 1 in the temporarily assembled state
Reference numeral 7 'designates a plurality of specific positioning and holding means 27,.
The jig pallet 10 is positioned and held only by 7.
Is transferred to the _final stop position _PCW by the transfer means 11 and once stopped, the welding portions 65 by the welding robots 16.
To 72, so that the jig pallet 1
The underframe 17 assembled on the top 0 is transported to the next step by the transporting means 11 from the _final stop position _PCW .

Thus, the rear side frames 18, 18, the rear floor cross member 19, the middle floor cross member 20, the inside sills 21, 21, the front floor frame 22,
22, the dashboard lower 23, the front wheelhouses 24, 24, and the front bulkhead 25 are temporarily welded in a state where the relative positions thereof are fixed and maintained by the positioning and holding means 27 to 38 on the jig pallet 10, respectively. By doing so, the underframe 17 'in the tentatively assembled state can be configured in a state where generation of distortion due to welding is eliminated as much as possible. Moreover, the under-frame 17 'in the temporarily assembled state is fixed to a plurality of specific positioning and holding means 27, 36,.
37 and the other positioning and holding means 2
The main welding is performed on the jig pallet 10 in a state where the underframes 8 to 35, 38 are retracted from the underframe 17 ', so that the minimum positioning and holding means 27,. When performing the main welding by the welding robot 16 on the under-frame 17 'in the temporarily assembled state held by the ..., the other positioning and holding means 28 to 35, 38
Can be prevented from hindering the welding operation as much as possible, and the efficiency of the welding operation can be improved.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

For example, in the above-described embodiment, the plurality of specific positioning and holding means 27, 36, 37,.
0, but the positioning and holding means 27, 36,.
37 can be arranged on the jig pallet 10 so that the front and rear and lateral positions can be adjusted.

[0027]

As described above, according to the present invention, a jig provided with a plurality of positioning and holding means for positioning and holding a plurality of frame components constituting an underframe so that their relative positions are constant. a step of setting each frame component on a pallet, comprising the steps of the under-frame of each frame components mutually weld the provisionally welded temporary assembling state configured on the jig pallet, before
The process of sequentially performing the main welding process on each welded portion of the underframe in the temporarily assembled state.
A method of assembling a frame, wherein after the temporary welding and
Before the main welding, a specified plurality of positions
While the positioning and holding means maintains the positioning and holding state,
Positioning and holding means other than the specified plural positioning and holding means
Release the positioning and holding state and corresponding frame components
From the specified multiple positions after the evacuation.
Positioned and held on the jig pallet by the positioning and holding means
Since the final welding is performed on the under-frame in the temporarily assembled state, the relative positions of the frame components are kept constant during the temporary welding to minimize the occurrence of distortion during welding, and the temporary welding by the temporary welding is performed. When performing the main welding to the assembled underframe, the underframe is positioned and held by the minimum positioning and holding means, so that the efficiency of the welding operation can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing the overall arrangement of an underframe assembling apparatus.

FIG. 2 is a side view showing a setting state of each frame component on a jig pallet at a component setting position.

FIG. 3 is a plan view as viewed in the direction of arrow 3 in FIG. 2;

FIG. 4 is a vertical sectional side view showing a configuration of a positioning and holding means.

FIG. 5 is a side view corresponding to FIG. 2 in a full stop position.

FIG. 6 is a plan view as viewed in the direction of arrow 6 in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Jig pallet 17 ... Under frame 17 '... Under frame in temporary assembly state 18 ... Rear side frame as a frame component 19 ... Rear floor cross member as a frame component 20 ..Middle floor cross member 21 as a frame component Inside sill 22 as a frame component Front floor frame 23 as a frame component Dashboard lower 24 as a frame component 24 Front wheel house as a frame component 25 Front bulkhead as a frame component 27 to 38 Positioning and holding means 65 to 72 Welded part

Continuation of the front page (56) References JP-A-53-81450 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 65/00

Claims (1)

(57) [Claims] A plurality of positioning and holding means (27 to 38) for positioning and holding a plurality of frame components (18 to 25) constituting an under frame (17) such that their relative positions are constant. Setting each frame component (18 to 25) on the jig pallet (10) to be provided;
5) a step of constructing welded portion (65 to 72) each pre-welded to the underframe of the temporarily assembled state (17 ') in the jig pallet (10) on the said underframe temporary assembly state (17 sequentially allowed to elapse and a step of applying the welding the welded portions (65-72) in '), Ann automobile
A method of assembling the underframe after the temporary welding and before the main welding.
A plurality of specific positioning and holding hands of the holding means (27 to 38)
Steps (27, 36, 37) maintained the positioning and holding state
The specific plurality of positioning and holding means (27, 36, 3)
7) Positioning and holding means (28 to 35, 38) other than
Release the fixed holding state and corresponding frame components
(18 to 23, 25), and after the retreat, the specific plurality of positioning and holding means (27,
36, 37) on the jig pallet (10)
The under-frame (1)
Wherein characterized in that this weld is subjected, the underframe assembly method of a motor vehicle against 7 ').