JPS6141790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle body assembly apparatus for assembling left and right side bodies and a floor, which are large body parts of an automobile.

Conventionally, when assembling the floor and side body, work such as accurate positioning has relied on humans, but such manual work not only requires labor and man-hours, but also causes variations in quality, so unmanned There has been a strong demand for a vehicle body assembly device that can perform efficient assembly work. In order to meet such demands, a vehicle body assembly apparatus for an automobile body as disclosed in Japanese Patent Publication No. 53-21542 has been proposed. That is, in that invention, the side body assembly jig is configured to be able to swing between the upright position and the expanded position, and the floor is transported horizontally by a conveyor into the middle of the expanded assembly jig, and the floor is transported horizontally by a drop lifter. The side body is loaded in a vertical direction in a relatively rough manner, and the positioning pins and After correctly positioning and clamping to the assembly jig with a clamping device, then raising the assembly jig and setting the floor and both side bodies in the correct relative positions, welding is performed in a specified manner using a welding machine equipped with the jig. This makes it possible to assemble the vehicle body automatically.

However, in such conventional vehicle body assembly equipment, in order to position the side body, which has been relatively roughly inserted into the assembly jig by the drop lifter, into a predetermined position and attitude, the manpilulator device is used to temporarily move the side body to an intermediate position. The assembly jig is set correctly by swinging from the spread position to the expanded position, and the floor and side body are set in the correct positional relationship by swinging the assembly jig from the spread position to the upright position. Therefore, there was a problem in that it took a long time to set these items.

This invention was made by focusing on such conventional problems, and after the side body is temporarily supported by a rough guide provided at an intermediate position between the expanded position and the upright position of the side of the jig. The above problem is solved by swinging the side of the jig, transferring the side body to it, positioning and clamping it, and then further swinging the side of the jig to properly set the side body on the floor.

The present invention will be explained below based on the drawings.

FIG. 1 shows an overview of the interrelationship positions and welding locations of each member of an automobile body assembled by the vehicle body assembly apparatus according to the present invention, in which 1 is a floor, 2 and 2' are a pair of left and right side bodies. and
In FIG. 1, the parts marked with an x mark indicate the welding locations. In Figures 2 and 3, 3 is a base, 4 is a receiving post installed on the base 3,
The floor 1 conveyed by a conveyor (not shown) is stopped and positioned at a fixed position on the receiving post 4. The devices described below are provided on both sides of the thus positioned floor, but since these devices are provided symmetrically, only the devices on one side will be described below for convenience. Reference numeral 5 denotes support blocks installed on the base 3, and a support arm 7 is swingably supported on these support blocks 5 via a shaft 6. 8 is a pivot base, and this pivot base 8 is fixed to the support arm 7. A first pillar 9, a second pillar 10, and a third pillar 11 are provided upright on the pivot base 8 at a predetermined distance from each other. A plurality of clamps 12 for positioning and clamping the side body 2 are arranged at predetermined positions via cylinders 14, respectively. Reference numeral 15 is a spot welding gun for welding the side body 2 to the floor 1, and a large number of guns 15 are installed at predetermined locations on the pivot base 8 and each pillar 9, 10, 11 via brackets 16. ing. 13 and 17 are precision guides having the same shape as the lower and upper ends of the body side 2, respectively, and these precision guides 13 and 17 are the upper ends of the first, second, and third pillars 9, 10, and 11, respectively. and installed at the bottom end. 18 and 19 are locate pins for positioning the side body 2, and these locate pins 1
8 and 19 are installed at predetermined positions of the first and third pillars 9 and 11, respectively. Reference numerals 20 and 20' denote driving cylinders installed on the base 3 via brackets 21 and 21', respectively, and piston rods 22 and 2 of these driving cylinders 20 and 20'
The tip of the bracket 2' is pivotally connected to a bracket 23, 23' fixed to the pivot base 8 by a pin. Reference numeral 24 denotes a stopper provided on the base 3, which restricts the clockwise swing angle of the support arm 7 in the figure. The aforementioned support arm 7, pivot base 8, first, second, and third pillars 9, 10, 11, clamp 12, gun 15, precision guides 13, 17, and locate pins 18, 19 are all located on one side of the assembly line. This constitutes a jig side 25 installed on the side. The jig side 25 is the driving cylinder 2
0 and 20', it is possible to swing from the expanded position to the upright position with the shaft 6 as the swing center, and the side body 2 is positioned by the locate pins 18 and 19, and the precision guides 13 and 17 and the clamp 12,
12 can be used for accurate clamping.
Here, the expanded position means that the jig side 25 is connected to the piston rods 22, 2 of the drive cylinders 20, 20'.
2', the support arm 7 swings clockwise in FIG. 2, comes into contact with the stopper 24, and is stopped. 22,2
2' protrudes, the jig side 25 becomes the second
A pair of locking members 26, 26' are installed on both sides of the pivot base 8 in the length direction on the base 3, swinging counterclockwise in the figure and standing almost upright with respect to the base 3.
This is the position where the floor 1 and the side body 2 are correctly set in relation to each other by coming into contact with the stopper 26b attached to the brackets 26a, 26a fixed to the base 3. 27 is normally located at an intermediate position between the expanded position and the upright position of the jig side 25, and is suspended at an intermediate position between the jig side 25 and the side body 2 by a hanger 28 of a drop lifter (not shown). This is a rough guide that temporarily supports the side body 2 that has arrived. This rough guide 27 is oscillated by three support brackets 29 installed on the base 3 at predetermined intervals in the length direction of the pivot base 8 via a shaft 30 coaxial with the shaft 6. A swinging arm 32 is freely supported and has a curved surface 31 at the tip having a shape substantially the same as the lower end of the side body 2, and a side body that is rotatably supported by this swinging arm 32 and descends from above. A curved guide bracket 33 guides the side body 2 to the curved surface 31 when the bracket hits the curved surface 31. A cylinder 34 is rotatably attached to the swing arm 32, and the tip of a piston rod 35 of the cylinder 34 is connected to the guide bracket 33. 36 is a spring that always urges the swinging arm 32 toward the expanded position of the jig side 25; 37 is a stopper that restricts the position of the swinging arm 32 and the support bracket 29; When the stopper 37 is in contact with the swing arm 32, the swing arm 32 is located at an intermediate position between the expanded position and the upright position. Reference numerals 38 and 38a are contact pieces provided on the swing arm 32 and the jig side 25, respectively. Also,
Limit switches for detecting the positions of the side bodies 2 and the like are appropriately installed on the jig side 25 and the rough guide 27, but are not shown in this embodiment. In addition, the jig side 25 mentioned above
As described above, structures similar to the rough guide 27 are also symmetrically arranged on the other side of the assembly line.

Next, the effect will be explained.

The floor 1 is conveyed by a conveyor of an assembly line, placed on a receiving post 4, and positioned. At this time, the jig side 25 is in the expanded position,
The rough guides 27 are located at intermediate positions. In this state, first, the side body 2 carried in by the hanger 28 of the drop lifter is put into the rough guide 27. As a result, the side body 2 is guided by the guide bracket 33 and supported by the curved surface 31 of the swing arm 32. Next, by operating the cylinder 34 and rotating the guide bracket 33 clockwise in FIG.
is supported by the rough guide 27. Next, the driving cylinders 20, 20' are actuated to cause the piston rods 22, 22' to synchronously protrude by a predetermined stroke. As a result, the jig side 25 pivots around the shaft 30 from the expanded position to the intermediate position.
That is, the precision guides 13 and 17 are brought into contact with the lower end and the upper end of the side body 2, respectively, by swinging to the same position as the rough guide 27, and
Locate pins 18, 18 are inserted into locate holes provided on the side body side, and the cylinder 14 is driven to act on the clamp 12 to accurately position and clamp the side body on the jig side 25. In this way, the side body 2 is transferred from the rough guide 27 to the jig side 25 and is positioned and clamped. Next, the cylinder 34 is operated, the guide bracket 33 is rotated counterclockwise to release it, and the drive cylinders 20, 20' are moved again.
The piston rods 22, 22' are synchronously projected. As a result, jig side 25
is swung from the intermediate position to the standing position and stopped by stoppers 26b, 26b. Although not shown in the drawings, it is preferable that this stopper portion is provided with locking means such as a pin operated by a cylinder. At this time, the rocking rough guide 27 is also rocked from the intermediate position to the upright position by the contact of the contact pieces 38 and the rocking of the jig side 25. Therefore, the side body 2 is correctly set on the floor 1 positioned on the pedestal 4.
Next, as described above, the side body 2 and floor 1 are
It is welded to a predetermined location. After the assembly of the side body 2 and floor 1 is completed as described above, the driving cylinders 20, 20' are operated and the piston rods 22, 22' are retracted. As a result, the jig side 25 swings from the upright position to the expanded position and is stopped by the stopper 24, and the rough guide 27 swings from the upright position to the intermediate position by the compression spring 36, and is stopped by the stopper 24. It was stopped on 37th. At this time, cylinder 3
Since low pressure air is constantly supplied inside 4,
The piston rod 35 is easily retracted, the bracket 33 swings, and the rough guide 27 is separated from the side body 2. Next, the floor 1 and side body 2 assembled in this manner are transported to the next process by an assembly line after the cowl top, part shelf, etc. are assembled using an assembly jig (not shown).

As explained above, according to this invention,
A rough guide that has a swing center coaxial with the jig side and temporarily supports the side body is provided at an intermediate position between the expanded position and the upright position, and the side body is temporarily supported by this rough guide. After that, the side of the jig was swung, the side body was transferred to it, and the side body was positioned and clamped.Then, the side of the jig was further swung to set the side body correctly on the floor, which reduced the time required for these settings. can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an automobile body assembled by a vehicle body assembly apparatus according to the present invention, FIG. 2 is a schematic front view showing an embodiment of the vehicle body assembly apparatus according to the present invention, and FIG. It is an AA arrow view of a figure. 1...floor, A...cradle, 2...side body,
25...Jig side, 31...Curved surface, 27...Rough guide.

Claims (1)

[Claims] 1 A pair of jig sides that can swing from the expanded position to the upright position on both sides of the cradle on the floor and that can respectively position and clamp the side bodies, and a jig side that is the same as the swing axis of the jig sides. a rough guide that is movable around an axis, is normally maintained at an intermediate position between the expanded position and the upright position of the jig side, and has a curved surface that supports the side body; After supporting the side body, the jig side is swung from an expanded position to an intermediate position, and the side body supported by the curved surface is delivered to the jig side, and positioned and clamped to the jig side;
Next, by swinging the side of the jig from the intermediate position to the standing position, the side body can be accurately set with respect to the floor positioned on the pedestal, and the side body and floor can be welded and connected. An automobile body assembly device characterized by: