JPS6211715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a general-purpose assembly line for automobile doors.

Conventionally, as an assembly line for automobile doors, a welding line as disclosed in, for example, Japanese Unexamined Patent Application Publication No. 137050/1983 has been known. In other words, this welding line can assemble left and right doors alternately or simultaneously if they are for the same car model and model. However, since the door is dedicated to one type of car or car type, when assembling a door for another car type or car type with a different shape, the fixtures and setting tables 11, 14 in each press device 12, 13, 15, 16, 17 are used. It was impossible to deal with the problem without replacing everything. Furthermore, when replacing the fixtures, the fixtures and setting tables for the new car model and model, which are stored in a storage area away from the welding line, must be transported to the welding line and replaced with the fixtures and setting tables that were previously used. This required a large amount of time and man-hours. Therefore, when changing the model of the own truck, it is necessary to spend a large amount of money and a large amount of time and man-hours.

Therefore, this invention was made by focusing on the drawbacks of the conventional welding process, and uses a dedicated multi-spot welding machine in the temporary welding process, a teachingable welding robot in the additional welding process and after-hem welding process, and moreover, In the hemming process, by using a hemming press device that can quickly change the press mold when changing the door shape, line changes due to model changes can be made inexpensively and in a short period of time. It is assumed that

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

1 to 8 are diagrams showing an embodiment of the present invention. First, to explain the configuration, in Figure 1,
This automobile door assembly line consists of parts setting/temporary welding stage 11, additional welding stage 12, marriage process 13, and hemming process 1 from its starting point.
4, an after hem welding process 15, and an outer panel storage 17 connected to the marriage process 13 via a labeler process 16, and these processes are connected by a conveying device 18. The parts setting/tack welding process 11 is equipped with a table top type dedicated multi-spot welding machine 20 as shown in FIG. In FIG. 2, a base 22 is installed on a floor surface 21, and a jig base 23 having a hole 23a in the center is installed on this base 22. A jig 24 equipped with a back electrode etc. is provided on the top surface of the jig base 23, and this jig 24 allows the inner panel IP of the door to be
Accessory parts such as a sash S and a reinforcement R attached to this inner panel are positioned and held. A lifter 25 is located in the center of the jig so as to be movable up and down, and this lifter 25 is connected to the tip of a piston rod of a drive cylinder 26 attached to the base 22. A plurality of arms 27 are rotatably provided on the base 22, and a welding gun 28 is provided at the tip of each arm 27. A piston rod tip of a cylinder 29 is rotatably connected to the center of each arm 27, and these cylinders 29 are rotatably provided on the base 22. 30 is a pad that presses down the inner panel IP, sash S, and rain force R held by the jig 24 from above;
0 is connected to the tip of a piston rod of a cylinder 32 attached to the upper part of the machine frame 31. The shape is rough and versatile.

Said additional stroke process 12 and after hem welding process 1
5 is equipped with a welding robot 35 that operates according to teaching as shown in FIG. In FIG. 3, a base 36 is installed on the floor 21, and a hole 37a is provided in the center of the base 36.
A pedestal 37 is installed. A drive cylinder 38 is provided on the base 36, and a pedestal 37 is provided at the tip of the piston rod of the drive cylinder 38.
A lifter 39 located on the upper surface side is connected. A plurality of welding robots 35 are installed on the floor on the sides of the pedestal 37, and these welding robots 35 move arms 35a to direct the welding gun G toward the inner panel IP placed on the pedestal 37. Welding is now performed with the two parts closely spaced apart.

The hemming step 14 uses a hemming press device 41 as shown in FIGS. 4-8.
A pad 44 is housed in the center of the upper die 42, and a hook 45 protrudes from the top surface of the pad 44, and a ridge 46 protruding from the front and back of the top surface has a U.
Two shaped cutouts 47 are provided facing each other.

There are wheels 48 at four locations on the lower side of the lower mold 43, a hook 49 is provided protruding from one lower end, and approximately V-shaped grooves 50 are formed at both lower ends. Further, a block 51 tapered downward is provided at the lower side of the side where the wheel 48 is provided. Furthermore, a rod 53 provided with a flange projects from the lower surface of the lifter 52 installed in the center.

The press device 41 will be explained below.

Reference numeral 54 denotes a changing device as a means for loading and unloading the press mold, and an endless chain 56 that crosses over the bolster 55 has two pairs of protruding attachments 57 projecting upward at a desired interval. Reference numeral 58 denotes a sprocket around which the chain 56 is wound, and a motor 59 serving as a rotational drive source is connected to one end of the sprocket.

Reference numeral 60 denotes two fixed rails installed in parallel to be perpendicular to the lift-and-carry type conveyance device 18, each of which is provided with an elevating rail 61 to be described below in the middle, and one end of each is provided with a bolster 55. The other end is fixed to the ground plane by a leg 62.

The elevating rail 61 is movable up and down by two cylinders 63, and both ends thereof are continuous with the fixed rail 60 when ascending.

Reference numeral 64 denotes a block for positioning the lower mold, which has a chevron shape or the like as shown in FIG. have

65 is also a positioning device for the lower mold 43, and as shown in FIG.
One end of each plate 67 is rotatably attached, and the other end is rotatably attached to a bracket 68 fixed to the bolster 55, which functions to position the lower mold 43 in the carrying direction.

69 is a lifter driving device for the lifter 52 in the lower mold 43, and as shown in FIG.
The piston rod has a block 72 with an inverted T-shaped groove 71 at its tip. The cylinder 70 is attached to the center of the bolster 55 by a guide frame 73.

When the lower mold 43 is carried in, the rod 53 attached to the lifter 52 inside the lower mold 43 is engaged with the block 72.

74 is a clamp for tightening the existing upper mold 42, and the cylinder 7 attached to the slide base 75
A T-shaped rod 74 is attached to the tip of the piston rod 6.
A is attached to the notch 47 formed in the upper die 42.
It swings to lock and tighten.

77 is a pad operation device, and as shown in FIGS. 5 and 8, a support 79 is attached to the tip of the piston rod of a cylinder 78 attached to a slide base 75, and the end of the support 79 is attached to the slide base 75. The guide rod 80 is fixed to the lower end of the guide rod 80 which hangs vertically from the guide rod 75. A hook 81 that hangs rotatably from the support 79 has a locking part 82 facing upward at the bottom, a pressing part 83 tilting downward at the top, and the hook 81
A pin 84 is attached to the upper end of the block 86, which is attached to a guide rod 85 that is movable up and down on the slide base 75.
It is locked in the elongated hole 87 of. The length of the guide rod 85 is such that when the guide rod 85 is fully raised, the locking portion 82 of the hook 81 is horizontal, and when the guide rod 85 is completely lowered, the pressing portion 83 is horizontal.

Next, the action will be explained.

First, in the preliminary stamping step 11, an operator positions accessory parts such as the inner panel IP, the sash S, and the reinforcement R on the jig 24. Then,
The cylinder 32 is operated to project the piston rod, and the pad 30 presses the inner panel IP, sash S, and reinforcement R against the jig 24.
Next, the cylinder 29 is actuated to project the piston rod and rotate the arm 27 upward. Then, the tip of the welding gun 28 is brought into contact with a predetermined portion of the inner panel IP. Next, electricity is applied between the welding gun 28 and the back electrode provided on the jig 24,
Inner panel IP Satsushi S, Rainforce R
etc., and position them by tack welding. Next, actuate the cylinder 29 to retract the piston rod,
The arm 27 is rotated downward and positioned to the side of the jig 24. Next, the cylinder 32 is actuated to retract the piston rod, and the pad 30 is moved to the jig 24.
position upward and away from the Next, the drive cylinder 26 is actuated to project the piston rod, and the lifter 25 raises the inner panel IP to which the sash S, reinforcement R, etc. have been temporarily welded. Next, a transport device (not shown) receives this inner panel IP and transports it to an additional printing process 12.

Next, in the additional stroke step 12, the inner panel IP carried in by the transport device is delivered to the lifter 39 protruding from the upper surface of the pedestal 37. Next, the drive cylinder 38 is operated to retract the piston rod, and the inner panel IP is placed on the pedestal 37. Next, the welding robots 35 that have been taught to perform predetermined operations are operated, and the welding robots 35 perform additional stroke welding on the inner panel IP to completely weld the sash S, reinforcement R, etc. to the inner panel IP. . Next, the drive cylinder 38 is actuated to project the piston rod, and the ejector 39 raises the inner panel IP from the pedestal 37. Next, a conveyance device receives this inner panel IP and marries it in step 13.
Transport to. Here, the pedestal 37 is adapted to receive the same shaped portion even if the vehicle type and model are different, so that a common pedestal 37 can be used.

Next, in the marriage process 13, the outer panel with anti-vibration tape pasted has already been conveyed from the outer panel storage 17 via the labeler process 16, and the inner panel IP is conveyed here from the additional printing process 12 to form the outer panel. It is married. During this marriage, a simple pre-hem is applied to the outer panel to prevent misalignment between the inner panels. Next, a transport device (not shown) transports the inner panel IP married with the outer panel to a hemming process 14.

Next, in the hemming step 14, first, a predetermined upper mold 42 and lower mold 43 are fixed to the general-purpose hemming press device 41 in the following manner. That is, the lower mold 43 on which the upper mold 42 is mounted is placed on the fixed rail 60 via the wheels 48 and transported to the location shown in FIG.
6 attachment 57. Therefore,
The motor 59 is driven to transfer the upper mold 42 and lower mold 43 to the center of the press device 41 while stacking them, and both molds 4
2, 43 enters the center of the bolster 55, the motor 59 is stopped. Further, at the same time as the motor 59 rotates, the cylinder 66 is operated to raise the plate 67, and the block 5 of the lower die 43 is moved upward.
The lower die 43 is carried in while the block 1 slides on the slope of the plate 67, and the block 51 is housed between the plates 67. When the lower mold 43 is carried in, the lifting rail 61
The wheels 48 of the lower die 43 are now standing on top.

At this time, the groove 50 is set in the positioning block 64 with a gap maintained as shown in FIG.

The lifter drive device 69 includes a lower die 43.
The rod 53 of the lifter 52 provided at the center of the block 72 fits into the groove 71 of the block 72 as the lower die 43 moves.

At this time, the rod 74a of the tightening clamp 74 of the upper mold 42 is located directly above the notch 47 provided in the upper mold 42, and the pad operating device 77 is located directly above the hook 45 of the pad 44 as shown in FIG. is located.

When the lifting rail 61 is lowered in the above state, both molds 42 and 43 are lowered, and the two plates 67 of the positioning device 65 move the block 51
is fixed to fix the position of the mold in the loading/unloading direction, and the position of the workpiece in the flow direction is fixed by the positioning block 64 and the groove 50 of the lower mold. In this case, the cylinder 66 of the positioning device 65 remains raised and is pressed down by the weight of both molds 42 and 43, and the lower mold 43
At the same time, the lower die 43 is placed on the bolster 55.

In this fixed state, the wheels 48 are slightly separated from the lifting rails 61.

Next, the slide base 75 of the press device 41 is lowered.

At this time, the rod 74a of the tightening clamp 74 is in an upwardly sprung state.

The pad operating device 77 applies pressure within the cylinder 78 to lower the support 79 as shown in FIG. During the descent of the slide base 75, the pressing portion 83 of the hook 81 hits the upper surface of the hook 45 of the pad 44, and by lowering the slide base 75, the piston rod of the cylinder 78 is pushed back while being subjected to compression force. At this time, the hook 45 and pad operating device 77 are in the state shown in FIG. The cylinder 78 is now actuated. Then, as shown in FIG. 8, the pad 44 is attached to the locking portion 82.
The hook 45 is locked. When the slide base 75 is at its lower limit, the tightening clamp 74 swings the rod 74a into the notch 47 of the upper die 42 and then tightens it to move the upper die 42 onto the slide base 7.
It sticks to 5. In this state, the slide base 75 is raised to position the upper mold 42 upward, and pressure is applied to the cylinder 70 to raise the lifter 52.

As described above, the upper die 42 is attached to the slide base 7.
5, it is fixed to a lower mold bolster 55. Next, from the marriage step 13, the inner panel IP is carried into the press mold by the conveyance device and set therein, and the hemming press device 41 is activated in cycles to perform hemming press processing on the outer panel, thereby hemming and joining the outer panel and the inner panel. let

The movement of the pad 44 during this processing will be explained with reference to FIG.
The hook 45 of the pad 44 is locked by the hook 81 together with the pad 2, and is positioned upward. Next, when the inner panel, which has been simply pre-hemmed with the outer panel and carried in from the marriage process 13, is placed on the lower die 43, pressure is applied inside the cylinder 78 and the pad 4
4 on this inner panel. Then, by lowering the slide base 75 to process this inner panel with the upper mold, the piston rod enters the cylinder 78 due to the pressing force, and the pressing surface 83 of the hook 81 is pressed against the pad 44 with an appropriate pressure.
As a result, the pad 44 continues to press and hold this inner panel with appropriate pressure. Then, when the upper mold 42 reaches its lower limit after pressing, the cylinder 78 is operated to rotate the hook 45 and the locking surface 82 and pad 44 are rotated.
The hook 45 is brought into contact with the hook 45. Thereafter, the pad 44 is raised as the slide base 75 is raised, completing one cycle and preparing for the next operation.

On the other hand, the action of the lifter 52 of the lower mold 43 applies pressure to the cylinder 70 to raise the lifter 52 and place the inner panel thereon. Therefore,
The piston rod is lowered to lower the lifter 52, the inner panel is positioned and placed on the lower mold 43, and the upper mold 42 is lowered to perform hemming. After the upper mold 42 is raised, the hemmed workpiece is raised via the cylinder 70 and transported to the after hem welding step 15 by a transport device (not shown). Therefore, in this general-purpose hemming press device 41, the press mold can be replaced within a short time with another press mold corresponding to an inner panel and an outer panel having a different shape from the inner panel and outer panel. can. That is, by lowering the slide base 75 of the upper mold 42, the lower mold 4
3, remove the tightening clamp 74, apply pressure to the cylinder 78, lower the hook 81, and remove the hook 45 of the pad 44. and cylinder 6
Apply pressure to 3 and raise the lifting rail 61 to remove both molds 4.
2, 43 and positioning block 64.
The groove 50 of the lower mold 43 comes off, and the positioning device 65
The block 51 of the lower die 43 is also removed from the plate 67. When the lifting rail 61 is level with the fixed rail 60, the sprocket 58 is rotated in the opposite direction by the motor 59 to move the chain 56.
Both molds 42 and 43 are moved on the fixed rail 60 and returned to the original part A.

When the press die is returned to its original position in this way, another press die that has a similar mechanism to the above press die and that corresponds to an inner panel and an outer panel that are different in shape from the above is placed on the B section on the opposite side of the fixed rail 60. Once set, this press mold can be carried into the center of the press machine by the movement of the chain 56, and can be fixed to the press machine and press working can be performed by the same operation as described above.

Next, in the outer hem welding step 15, the inner panel that has been hemmed to the outer panel brought in by the conveyance device is indirectly welded at the hemming joint portion by a welding robot in the same manner as the above-mentioned additional hammering step 12, and is assembled into one automobile door. Can be assembled.

Now, when an automobile model is changed and a door with a different shape from the above is to be assembled, the additional hammer step 12 and the after hem welding step 15 can be handled by changing the teaching of the welding robot, and the hemming step 14 can be handled by changing the teaching of the welding robot. Since this can be dealt with by replacing the press die as described above, only the jig for the multi-spot welding machine in the temporary welding process 11 needs to be newly installed. Therefore, it is possible to respond to automobile model changes with a relatively small capital investment, and the construction period is also relatively short.

As explained above, according to this invention,
A temporary welding process uses a special multi-spot welding machine to temporarily weld accessory parts to the inner panel and positions them, and a teachable welding robot performs additional stroke welding of the temporarily welded accessory parts to the inner panel. The additional stroke process, the marriage process of marrying the outer panel to the inner panel to which accessory parts are welded, the rail installed across the bolster to carry in and out the hemming press mold consisting of the upper and lower molds, and the loading and unloading of the hemming press mold. A general-purpose hemming press device having a positioning means provided on a bolster for positioning the carried-in hemming press mold, and an upper mold clamping means provided on a slide base is used to remove the edge of the outer panel from the inner side. The method includes a hemming process of hemming the panel, and an after-hem welding process of welding both panels joined by the hemming at the edge using a teachable welding robot.
When changing an automobile model, it can be done with a small capital investment and in a short construction period.

[Brief explanation of the drawing]

1 to 8 are diagrams showing one embodiment of an assembly line for automobile doors according to the present invention, FIG. 1 is a block diagram showing the assembly line, and FIG. 2 is a table top provided for the temporary taping process. FIG. 3 is a cross-sectional side view showing a multi-spot welding machine for molds; FIG. 3 is a cross-sectional side view showing a welding device for an additional stroke process equipped with a welding robot;
Fig. 4 is a partially cutaway overall perspective view showing a general-purpose hemming press device equipped for the hemming process, and Fig. 5 is a partial view showing a pad operating device and a lower die positioning device of the general-purpose hemming press device. Fig. 6 is a partially cutaway front view showing the lifter drive device of the general-purpose hemming press machine, and Fig. 7 shows the condition of the positioning block and the groove of the lower die of the general-purpose hemming press machine. The side view shown in FIG. 8 is a front view showing the operating order of the pad operating device of the general-purpose hemming press device. IP……Inner panel, S……Satushiyu, R……
Reinforce, 12...Additional stroke process, 13...Marriage process, 14...Hemming process, 15...After hem welding process, 35...Welding robot, 41...
...General-purpose hemming press device, 42...Upper mold,
43... Lower mold, 55... Bolster, 60, 61...
...Rail, 54... Carrying means, 65... Positioning means, 75... Slide base, 74... Tightening clamp.

Claims (1)

[Scope of Claims] 1. (a) A temporary welding process in which accessory parts are temporarily welded and positioned on the inner panel using a dedicated multi-spot welding machine, and (b) A welding process that uses a teachable welding robot to perform temporary welding. (c) A marriage process of welding the outer panel to the inner panel to which the accessory parts have been welded; (d) Carrying in a hemming press mold consisting of an upper and lower die. A rail provided across the bolster to take out the hemming press mold, a means for carrying in and out of the hemming press mold, a positioning means provided on the bolster for positioning the hemming press mold carried in, and an upper mold provided on the slide base. (e) Hemming the green portion of the outer panel onto the inner panel using a general-purpose hemming press device having clamping means; An assembly line for automobile doors characterized by having an after-hem welding process in which the parts are welded at the hem.