JPH08207843A - Body assembling line of automobile - Google Patents

Abstract

PURPOSE: To provide efficient transportation by fitting loosely a friction roller to a rotary shaft rotated by forcible drive at all times to be relatively rotated so that a jig pallet is conveyed by the rotary force of the friction roller. CONSTITUTION: A plurality of rotary shafts 10, 10... opposed to frames 9, 9 are rotatably provided. A friction roller 11 is loosely fitted to one end of each of rotary shafts 10, 10... to be rotated relatively to the rotary shaft 10 and a driven bevel gear 12 meshing with a main drive gear 15 fixed to a drive shaft 14 is attached fixedly to the other end of the rotary shaft to constitute a friction roller conveyer 6. The rotary shafts 10, 10 are rotated through the drive shaft 14, main drive and driven bevel gears 15, 12 by the rotary torque of drive motor 13 so that a jig pallet 7 is conveyed by a rotary force of a friction roller 11 generated by the friction between the outer peripheral surface of the rotary shaft 10 and the inner peripheral surface of the friction roller 11. When the jig pallet is stopped, a force exceeding the frictional force between the outer peripheral surface of the rotary shaft 10 and the inner peripheral surface of the friction roller 11 is applied to the jig pallet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body assembly line for line production of a main body which constitutes a vehicle body of an automobile.

[0002]

2. Description of the Related Art A body assembly line for producing a main body line of an automobile is a resistance welding facility called a spot welding machine, which mainly includes press-formed underbody, left and right body sides, roof, cowl, package tray, etc. And, it is composed of a process of sequentially welding.

By the way, in the above-mentioned automobile body assembly line, the body side is positioned from the left and right with respect to the underbody held on the jig carriage and carried into the main body temporary attachment station, and the roof is seen from above. , The cowl and package tray are positioned,
After that, spot welding is performed to temporarily attach the main body.

Conventionally, the positioning of the left and right body sides with respect to the underbody in the mainbody temporary attaching step is performed by holding the bodyside on both sides of the mainbody temporary attaching station into which the underbody held on the jig carriage is carried. A positioning holder for positioning and fixing the jig pallet is installed so that it can be tilted, and while the positioning holder is tilted, the jig pallet holding the body side is supplied by appropriate transfer means to position and fix it. After that, the positioning holder is vertically raised to position the left and right body sides at predetermined positions with respect to the underbody.

Conventionally, in the above-mentioned automobile body assembly line, a free roller conveyor is used, a jig carriage is placed on the free roller conveyor, and the jig carriage is used as an endless chain which is constantly driven. On the other hand, it adopted a system that synchronizes and works with a drive device such as one that can be engaged and disengaged.

[0006]

On the other hand, in the conventional vehicle body assembly line, the positioning retainer for positioning the body side at a predetermined position with respect to the underbody at the main body temporary attachment station holds the body side. Since only one jig pallet can be fixed, the body side held by the jig pallet fixed to the positioning holder is temporarily welded to the underbody, and then the positioning holder is tilted. Otherwise, the empty jig pallet that has finished the temporary welding of the body side cannot be replaced with the jig pallet that holds the new body side. Therefore, even if there is time to replace the empty jig pallet with the jig pallet holding the new body side during the tack welding of the body side, the empty jig during the tack welding of the body side It was impossible to replace the pallet with the jig pallet that holds the new body side, which increased the takt time in the main body temporary mounting process and made workability poor.

Further, in a conventional automobile body assembly line, a jig carriage mounted on a free roller conveyor is engaged and disengaged from a driving device such as an endless chain which is constantly driven so that it is conveyed and stopped. Therefore, it is impossible to change the jig carriage transfer speed according to the work contents of each process or zone, or to transfer between jigs asynchronously. It was not possible to carry it efficiently.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a vehicle body assembly line for reducing the tact time of the main body temporary attaching process and for efficient transportation.

[0009]

In order to achieve the above object, the present invention holds an underbody on a jig pallet, conveys it to a main body temporary tacking station, and arranges it at this main body temporary tacking station. Positioning means positions the left and right body sides and the upper body parts of the roof, cowl, and package tray with respect to the underbody, and temporarily attaches them by welding means, holds them on the jig pallet, and conveys them. In a car body assembly line for completing a main body by sequentially welding to a predetermined location, a friction roller is provided relative to the rotary shaft, which is constantly rotated by forced drive, as a conveying means for the jig pallet. The outer peripheral surface of the rotating body, which is rotatably loosely fitted and rotationally driven, and the inner peripheral surface of the friction roller, are worn. Those with friction roller conveyor for conveying the jig pallet by the rotational force of the friction roller caused by.

Further, a polygonal rotary drum that rotates by indexing at a predetermined rotation angle is supported on a slide table that linearly reciprocates toward the center of the assembly line, and a body side jig is provided on two or more outer surfaces of the rotary drum. Jig with a clamping device that detachably clamps the pallet A pallet locking surface is formed to form a body side positioning device, and this body side positioning device holds the underbody on the jig pallet and temporarily attaches the main body It is installed symmetrically on both sides of the friction roller conveyor that conveys to the station.

[0011]

According to the present invention, since the friction roller conveyor is used as the jig pallet conveying means,
It is possible to change the jig pallet transfer speed by changing the number of rotations of the rotating shaft depending on the process.

Further, a body side positioning device constituted by mounting a rotary drum having two or more body side locking surfaces on a slide table which linearly reciprocates to rotate by a predetermined rotation angle is used as a jig. By holding symmetrically on both sides of the friction roller conveyor that holds the underbody on the pallet and conveys it to the main body temporary tacking station, the rotating drums of the left and right bodyside positioning devices are indexed and rotated to hold the bodyside. The body side engaging surface that clamps the jig pallet is exposed to the friction roller conveyor side, and the body side on the jig pallet that is clamped to this body side engaging surface is moved forward and backward with respect to the underbody by moving the slide base. Is temporarily attached from the rotating drum during this temporary attachment. In the body side locking surface other than the body side locking surface facing the friction roller conveyor side,
The jig pallet that has been emptied after the temporary attachment of the body side is replaced with the jig pallet that holds the new body side.

[0013]

1 is a plan view showing an overall layout of a vehicle body assembly line of an automobile according to the present invention, in which linearly arranged underbody lines (1) and the underbody lines (1 ) Is provided side by side with a predetermined interval in the opposite transport direction, and the start end is through the transfer device (not shown) equipped with an elevating mechanism at the end of the underbody line (1) and both ends disposed underground. A continuous main body line (2), an underbody sub-assembling line (3) arranged on one side of the starting end of the underbody line (1), and both sides of the main body line (2) near the starting end. A pair of left and right body side sub-assembling lines (4) and (4), and an overhead type R.O. C. A friction roller conveyor (6) is used as a jig conveying means for the underbody line (1) and the main body line (2), and the P loading (5) is provided on the friction roller conveyor (6). A large number of jig pallets (7) (7) ... Are placed and a predetermined number of spot welders (8) (8) ... Are arranged along the friction roller conveyor (6).

In the above structure, when assembling the vehicle body, the underbody (A) assembled by the underbody sub-assembly line (3) is located at the starting end of the friction roller conveyor (6) of the underbody line (1). It is transferred and held on the tool pallet (7). Then, the underbody (A) held on the jig pallet (7) is
The underbody line (1) is conveyed to the terminal end side together with the jig pallet (7) by the friction roller conveyor (6), and during this conveyance, the underbody line (1) is arranged along the friction roller conveyor (6). The spot welders (8), (8), ... Installed sequentially perform spot welding to predetermined places. In this way,
The underbody (A) conveyed to the end of the underbody line (1) is transferred to the friction roller conveyor (6) of the main body line (2) by a transfer device disposed underground together with the jig pallet (7). It is transferred to the starting end and is conveyed together with the jig pallet (7) to the main body temporary tacking station near the starting end of the main body line (2). Then, the left and right body sides (B) and (B) assembled by the pair of body side sub-assembly lines (4) and (4) from the left and right with respect to the under body (A) carried into the main body temporary mounting station Positioned, the R. C. The roof, cowl, and upper body parts of the package tray carried in by P loading (5) are positioned, and then spot welded by spot welders (8) (8) ... Main body temporary fitting is performed. In this manner, the left and right body sides (B) and (B) with respect to the underbody (A), the roof, the cowl, and the upper body parts of the package tray are temporarily attached to the friction main body (6). ) Conveys the main body line (2) together with the jig pallet (7) to the end side,
During this transportation, spot welding is sequentially performed at predetermined places by spot welding machines (8) (8) arranged along the friction roller conveyor (6) of the main body line (2), and finally the main body is finished. The body is completed. Then, the completed main body is conveyed to the end of the main body line (2) together with the jig pallet (7), and the jig pallet (7) is conveyed there by an overhead conveyor or the like.
It is lifted from and transferred to the next process. Further, the jig pallet (7) that has been conveyed to the end of the main body line (2) and the main body has been unloaded is the friction roller of the underbody line (1) via the underground carrier that is continuous with the underbody line (1). It is transferred to the beginning of the conveyor (6).

The friction roller conveyor (6) is
As shown in FIG. 2 and FIG. 3, a plurality of rotating shafts (10) (10) are rotatably arranged so as to face each other on a pair of frames (9) (9) arranged to face each other. A friction roller (11) is loosely fitted to one end of the rotary shaft (10) (10) so as to be rotatable relative to the rotary shaft (10), and the other rotary shafts (10) (10) ... An end driven bevel gear (12) is fixed, and the driven bevel gear (12) is meshed with a main driving bevel gear (15) fixed on a drive shaft (14) which is rotationally driven by a drive motor (13). The rotating torque of the drive motor (13) causes the rotating shafts (10) (10) ... to rotate via the drive shaft (14), the main driving bevel gear (15) and the driven bevel gear (12). Rotation of the friction roller (11) caused by friction between the outer peripheral surface of the shaft (10) and the inner peripheral surface of the friction roller (11). To transport the jig pallet (7) by. Also, jig pallet (7)
When stopping, the jig pallet (7) will slip if a force greater than the frictional force between the outer peripheral surface of the rotating shaft (10) and the inner peripheral surface of the friction roller (11) is applied to the jig pallet (7). Will be stopped. The friction roller conveyor (6) is divided into units for each process or zone, and the drive motor (14) is divided by the unit.
It is possible to change the transfer speed of the jig pallet (7) according to the work content of the process or zone by changing the number of rotations.

FIG. 4 is a schematic front view of a main body temporary tacking station in an automobile body assembly line according to the present invention, which is a friction roller conveyor (for carrying an underbody (A) held on a jig pallet (7). The body side positioning device (18) equipped with the carry-in hanger (17) for delivering the body side (B) assembled by the body side sub-assembly line together with the jig pallet (16) is symmetrical on both sides of 6). Is installed, and R. C. P
An upper body component positioning device (19) for positioning the roof, cowl, and upper body component (C) of the package tray carried in by loading with respect to the underbody (A) is provided.

In the body side positioning device (18), a support bracket (22) is erected on a slide base (21) which linearly reciprocates on the slide rail (20) toward the center of the friction roller conveyor (6). , This support bracket (22) is centered on the pivot (23) and is 1 / in the direction of the arrow.
Rotation drum (2
Clamping device that supports 4) and detachably clamps the jig pallet (16) of the body side (B) to the body side engaging surfaces (24a) (24a) on the outer four sides of the rotating drum (24). (Not shown) are installed respectively. A jig pallet extracting device (not shown) is disposed in front of (on the front side of the drawing) or behind (rear side of the drawing) the take-out side of the body side (B) by the carry-in hanger (17).

Next, the main body temporary attaching work in the main body temporary attaching station will be described. still,
In the left and right body side positioning devices (18), the slide base (21) is retracted to the rear end of the slide rail (20), and the body side locking surface (24a) facing above the rotating drum (24). A jig pallet (16) holding the body side (B) is clamped to the body side engaging surface (24a) facing the friction roller conveyor (6) side and the body side engaging surface (24a) facing downward. A jig pallet (16) that has been emptied after temporary welding of the body side (B) is clamped on the body side locking surface (33a) facing the opposite side of the friction roller conveyor (6) And

First, when the underbody (A) held on the jig pallet (7) is conveyed to the main body temporary attachment station by the friction roller conveyor (6) and positioned at a predetermined position, the left and right body side positioning is performed. The body side engaging surface (24a) on which the jig pallet (16) holding the body side (B) of the rotating drum (24) is clamped by rotating the rotating drum (24) of the device (18) by 1/4. Friction roller conveyor (6)
Face to the side. After that, the slide bases (21) of the left and right body side positioning devices (18) were moved forward, and clamped on the body side locking surface (24a) facing the friction roller conveyor (6) side of the rotating drum (24). The body side (B) held on the jig pallet (16) is positioned from the left and right with respect to the underbody (A) on the jig pallet (7), and the roof and cowl are positioned by the upper body component positioning device (19). And the upper body part (C) of the package tray is positioned from above with respect to the underbody (A) on the jig pallet (7). In this way, when the left and right body sides (B) and (B) and the upper body part (C) of the roof, the cowl and the package tray are positioned with respect to the underbody (A),
Spot welding is performed by a spot welding machine (26) provided in the main body temporary attachment station to perform main body temporary attachment. The body side (B) on the jig pallet (16) assembled on the body side sub-assembly line during this temporary mounting of the main body is locked by the carry-in hanger (17) on the upper side of the rotary drum (24). After vacating the jig pallet (16) after finishing the temporary welding of the body side (B) from the surface (24a), the jig pallet (16) and the jig pallet (16) are placed above the rotary drum (24). Hold the new bodyside (B) by delivering it to the bodyside locking surface (24a) that faces and clamping the jig pallet (16) holding the bodyside (B) on this bodyside locking surface (24a) The jig pallet (16) and the empty jig pallet (16) are exchanged. Then, after the temporary attachment of the main body is completed, the body side (B) is released from the jig pallet (16), the slide base (21) is slid to the rear end of the slide rail (20), and the rotary drum (24) is fixed. Retreat. At the same time, the roof, cowl, and upper body parts (C) of the package tray are R.O. C. Release from P loading. After that, underbody (A)
The left and right body sides (B) and (B) and the roof, cowl and upper body parts (C) of the package tray are temporarily attached to the temporary main body together with the jig pallet (7) and the friction roller conveyor (6). ), It is conveyed to the next process.

FIG. 5 shows another type of the body side positioning device (18). In this type, the quadrangular cylindrical rotary drum (24) is rotated by 1/2 rotation at the same time as the rotary drum (24) is rotated. The body side engaging surface (24a) facing the friction roller conveyor (6) and the body side engaging surface (24a) facing away from the friction roller conveyor (6) have a jig pallet (16) on the body side (B). Clamping devices (not shown) for detachably clamping are installed respectively. Then, in front of the body side positioning device (18) (on the front side of the paper surface), the body side (B) assembled by the body side sub-assembly line is attached to the jig pallet during tack welding of the body side (B). A body side supply device (25) for delivering to the body side locking surface (24a) facing the side opposite to the friction roller conveyor (6) of the rotary drum (24) is provided together with the (16), and the rear side (the back side of the paper surface). Includes a body side engaging surface (24) facing the side opposite to the friction roller conveyor (6) of the rotating drum (24) during temporary welding of the body side (B).
A jig pallet extracting device (not shown) for removing the vacant jig pallet (16) after the temporary welding of the body side (B) from a) is provided.

According to this body side positioning device (18), the rotary drum (24) is held by the jig pallet (16) clamped to the body side engaging surface (24a) facing the friction roller conveyor (6) side. Put the body side (B) on the underbody (A) on the jig pallet (7).
On the other hand, during the tack welding, the jig pallet extractor is used to temporarily remove the body side (B) from the body side engaging surface (24a) of the rotating drum (24) facing the opposite side of the friction roller conveyor (6). The jig pallet (16) that has been emptied after attachment welding is removed, and then the body side (B) assembled in the body side sub-assembly line is removed by the body side supply device (25). A jig holding the body side (B) on the body side engaging surface (24a), which is delivered to the body side engaging surface (24a) facing the opposite side of the friction roller conveyor (6) of the rotary drum (24). By clamping the pallet (16), the temporary tack welding of the body side (B) was completed and the jig pallet (16) that became empty and the new body side (B) were held. Carry out the replacement of the pallet (16).

[0022]

As described above, according to the present invention,
Since a friction roller conveyor is used as the jig pallet transfer means for the car body assembly line that carries out the main body line production of automobiles, the free-flow transfer method changes the jig pallet transfer speed depending on the process or zone, or transfers asynchronously. Therefore, efficient transportation can be performed according to the work content of each process.

Further, according to the present invention, during the temporary welding of the body side to the underbody at the temporary welding station of the main body, the jig pallet that has been emptied after the temporary welding of the body side is completed first. Since it can be replaced with a jig pallet holding a new body side, the takt time of the main body temporary mounting process can be shortened and workability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an overall layout of an automobile body assembly line according to the present invention.

FIG. 2 is a plan view of a friction roller conveyor used for carrying the jig pallet of the present invention.

FIG. 3 is a front view of the friction roller conveyor of FIG.

FIG. 4 is a schematic front view of a main body temporary mounting station in a vehicle body assembly line of an automobile according to the present invention.

FIG. 5 is a schematic front view of another type of body side positioning device of a main body temporary tacking station.

[Explanation of symbols]

 A Underbody B Bodyside C Upper body part 1 Underbody line 2 Main body line 3 Underbody sub assembly line 4 Body side sub assembly line 5 R. C. P loading 6 Friction roller conveyor 7 Jig pallet 8 Spot welder 16 Jig pallet 17 Carrying hanger 18 Body side positioning device 19 Upper body part positioning device 20 Slide stand 24 Rotating drum 24a Body side locking surface 25 Body side supply device 26 Spot welder

Claims (2)

[Claims] 1. An underbody is held on a jig pallet and conveyed to a main body temporary tacking station, and positioning means arranged at this main body temporary tacking station positions the body side and roof on the left and right with respect to the underbody. Position the upper body parts of the cowl and package tray and temporarily attach them by welding means, hold them on the jig pallet and transport them, and during this transport, perform welding to predetermined places successively to complete the main body. In a car body assembly line of an automobile, as a jig pallet conveying means, a friction roller is loosely fitted relative to the rotating shaft so as to rotate relative to the rotating shaft, which is constantly rotated by forced driving, and the outer circumference of the rotating body is driven. To the rotational force of the friction roller generated by the friction between the surface and the inner surface of the friction roller. Body assembly line of an automobile, characterized in that using a friction roller conveyor for conveying the RiOsamugu pallet. 2. A polygonal rotary drum that rotates by indexing at a predetermined rotation angle is supported on a slide base that linearly reciprocates toward the center of the assembly line, and an outer surface 2 of the rotary drum is supported.
The body side positioning device is configured by forming a jig pallet locking surface that has a clamp device that detachably clamps the body side jig pallet above the surface, and this body side positioning device holds the underbody 2. The vehicle body assembly line according to claim 1, wherein the friction roller conveyors conveyed to the body tacking station are symmetrically installed on both sides.