JPH01299793A - Welding device for sheets a set of work and device for assembling front work of vehicle by using said device - Google Patents

Abstract

PURPOSE:To improve welding quality and productivity by providing a 1st jig to the machine frame of the welding device, disposing a movable frame, mounting the 2nd jig thereto, and positioning two sheets a set of works between the two jigs, then welding the works in a perpendicular state. CONSTITUTION:The 1st jig 4 is fixed to the machine frame 3 of the welding device 2 and the movable frame 5 which can freely luff is disposed thereon. Fork members A as the work are received from a transporting conveyor 1 by the operation of a fork member setting device 12 and are set to the welding device 2, then the movable frame 5 is raised to move the 2nd jig 6 to the welding position. The members A and the jig 6 are exactly positioned to the jig 4 by means of positioning pins 9. The flange parts of the works are welded in this state in a vertical position. The sagging of beads to the lateral sides is eliminated by the vertical welding, by which the welding quality is improved. The productivity is greatly improved by the shortened waiting time for operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a welding device for two-piece workpieces and a vehicle front fork assembly device using the same.

(Prior Art) Conventionally, a welding device is known in which a set of two workpieces is sandwiched between a first jig and a second jig, and the joining portions of the two workpieces are welded by helical welding or butt welding. A first jig is installed facing upward on the upper surface of the machine frame, an elevating frame is provided on the upper side of the machine frame, the second jig is mounted downward on the lower surface of the elevating frame, and the second jig is mounted on the first jig. A two-piece set of workpieces is set, the elevator frame is lowered, and the two-piece workpiece is sandwiched between the first jig and the second jig to weld the joint portions of the two workpieces.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, since the two-piece workpiece is welded in a horizontal position, there is a problem in that the bead hangs down and tends to be biased to the side of the workpiece, resulting in an unsightly appearance. Since the next workpiece cannot be set until after the welded workpiece has been taken out from the first jig, there is a problem in that productivity is reduced due to the waiting time required to take out the workpiece.

The present invention has been made in view of the above problems, and its objects are to provide a welding device that can perform welding in an attractive manner and improve productivity, and to provide a welding device that can perform welding in an attractive manner and improve productivity; An object of the present invention is to provide an assembly device that can automatically assemble each fork member.

(Means for Solving the Problem) □In order to achieve the above object, in the invention of claim 1, a set of two workpieces is sandwiched between a first jig and a second jig, and the joint portions of both workpieces are welded. In a machine, the first jig is vertically fixed on the vertical front surface of the machine frame, and a movable frame is provided that can be raised and lowered around a support shaft at the lower front of the machine frame, and the movable frame is provided with the A second jig is mounted, and the second jig is sandwiched between the horizontal setting position where the two-piece workpiece is set and the two-piece workpiece set by the raising and lowering movement of the movable frame. A first welding position is provided on the side of the machine frame.
A workpiece take-out device was installed to take out the workpiece from the jig.

Further, in the invention of claim 2, in order to accurately sandwich the two-piece workpiece between the first jig and the second jig, the movable frame is provided with orthogonal three
The second jig is mounted via a support base that is freely floating in the axial direction, and a positioning pin that can be inserted into the through hole of the two-piece workpiece is retractably provided on the support base, and the second jig is attached to the machine frame. A positioning hole is formed into which the positioning pin can be inserted through the two-piece workpiece set, and a clamping means for clamping the second jig to the first jig is provided in the machine frame.

Further, the invention of claim 3 is such that the inner panel and outer panel constituting the left and right fork members of the front fork are welded together so that the left and right fork members of the front fork can be automatically assembled and put out as a set. A front fork assembly device for a vehicle is provided with a conveyor for conveying left and right fork members in which an inner panel and an outer panel are combined, and a pair of welding devices according to claim 1 or 2 is installed on the sides of the conveyor. A pair of fork member setting devices are installed in parallel so that the back faces of the machine frames face each other, and receive the fork members from the conveyor and set them on the second jigs of both welding devices. A fork member discharging station is provided in the middle of the equipment arrangement, and the work is taken out from both welding devices, and the fork member transfer is carried out by receiving the fork members from the device, bringing them close to each other, and discharging them to the dispensing station in a horizontal position. A device was installed.

(for production) The operation of the present invention will be explained based on the apparatus according to claim 3.

First, the fork member setting device receives the fork member from the conveyor and sets it in the welding device, and then the movable frame is raised, the second jig is moved to the welding position, and the positioning pin is projected.

According to this, the positioning pin is fitted into the positioning hole of the machine frame through the fork member, and the fork member and the second jig are accurately positioned with respect to the first jig.

Then 1. By operating the clamping means toward the clamp side, the second jig is clamped to the first jig, the fork member is sandwiched between both jigs, and the flange portions of the inner panel and outer panel are brought into close contact with each other, and in this state, both Weld the flange of the panel. In this case, since the fork member is in a vertical position, the bead does not hang down to the side of the fork member, and therefore the fork member can be welded with a good appearance.

Next, while retracting the positioning pin, the clamping means is operated to the unclamping side, the movable frame is collapsed, and the second jig is moved to the set position, and then the fork member is removed from the first jig by the operation of the workpiece removal means. Then, each fork member is received from each workpiece take-out device by the operation of the fork member transfer device, and the fork members are brought close to each other and delivered to the payout station in a horizontal position.

Also, after the second jig is moved to the set position, the fork members on the conveyor are set on the second jig by the operation of the work setting device, and by repeating the above operation, the left and right fork members are continuously set. automatically assembled.

(Example) In the drawing, (1) shows a longitudinally elongated transport conveyor that carries left and right fork members A, which are a combination of inner panel A1 and outer panel A2, which are two-piece workpieces, placed on a pallet B. 2) (2) is a pair of welding devices installed in parallel on the right side of the conveyor (1) so that the back surfaces of the machine frame (3) face each other, and each welding device (2) A first vertical jig (4) attached to the vertical front of the machine frame (3) and a movable frame (5) that can be raised and lowered around the support shaft (5a) at the lower front of the machine frame (3). and a second jig (6) attached,
The second jig (6) is held between the horizontal setting position where the fork member A is set and the fork member A is held between the first jig (4) by the raising and lowering operation of the movable frame (5). A workpiece take-out device (7) for taking out the fork member A from the first jig (4) was provided on the side of the machine frame (3).

Furthermore, the second jig (6) is attached to the movable frame (5) via a support base (8) which is freely floating in three orthogonal axes directions.
), and the support base (8) is provided with a positioning pin (9) that can be inserted into the through hole of the fork member A so as to be freely retractable, and the positioning pin (9) is installed on the machine frame (3). A positioning hole (10) that can be inserted through the fork member A is formed, and the machine frame (3) is further provided with clamping means (11) for clamping the second jig (6) to the first jig (4). Ta.

Also, the fork member A is received from the conveyor (1) and transferred to the second jig (6) of the re-welding device (2) (2).
(6) A pair of fork member setting devices (
In addition, a fork member A dispensing station (
13 is provided to receive the fork members ASA from the re-welding device (2) (2)'s workpiece unloading device <n (7), bring them close to each other, and move them to the unloading station a in a horizontal position.
A fork member transfer device 11@ for discharging the fork member 3 is provided.

To be more specific, the movable frame (5) is given a raising and lowering motion by a cylinder (5b) provided on the lower side of the machine frame (3), and the movable frame (5) is provided with a cylinder (5b) provided on the lower side of the machine frame (3). As you do,
A rod (+51) is slidably protruded, and the small diameter portion (15a) at the tip of the rod (1!
) to prevent the support base (8) from coming off, so that the support base (8) can float freely in three orthogonal axes directions with respect to the movable frame (5).

Further, as clearly shown in FIG. 5, the positioning pin (9) is connected to the tip of the piston rod of a cylinder (9b) attached to the support base (8) via a bracket (9a). (9b) causes the positioning pin (9) to move so that its tips are connected to both the first and second jigs (4) (6
), the tip of the positioning pin (9) is inserted into the positioning hole (IO in Figure 5) of the machine frame (3) through the fork member A held between ) can be inserted into the through hole of the outer panel A2 of the fork member A set on the top of the fork member A (virtual water preparation state in the drawing).

Furthermore, the fork member A set in the second jig (6) is held by suction on the support base (8) so that the fork member A set in the jig (6) does not fall off when the second jig (6) is moved from the setting position to the welding position. A magnet (+71) is provided and a cylinder (18a) attached to the support base (8).
A second jig (6) is provided with an extrusion tool (181) operated by
When the fork member A is moved from the welding position to the set position, the fork member A attracted to the magnet CI is moved to the first jig (4
) side.

Also, the cylinder (19a) attached to the machine frame (3)
A support pin a9 is provided that is protruded through the positioning hole (IQ) by the operation of It was made so that it would not fall off the first jig (4).

In the drawing, ■ is the second jig that detects the absence of fork member A (
6) is a proximity switch attached to the first jig (4) that detects the presence or absence of the fork member A.

In addition, the clamping means 0v has a pin C22a on the stay (3) protruding from the machine frame (3), as shown in FIGS. 2 and 4.
) The clamp arm (1
1a) and a cylinder (llb) attached to the machine frame (3) that opens and closes the clamp arm (11a), and a large link (11c) connected to the stay ■ with pin C22b).
), the piston rod of the cylinder (11b) is connected to the end of the cylinder (11b), and the large link (11e) is connected to the clamp arm (11a) via the small link (llc), thus making the cylinder (Ilb) Both links (1
1c) The clamp arm (lla) is brought into contact with the support base (8) via (11e) and attached to the machine frame (3).
Clamp state of pressing to the side and clamp arm (11a
) can be operated in an unclamped state in which it is separated from the support base (8).

In the drawing, ■ is a pull-back cylinder that pulls the support base (8) toward the movable frame (5), and 122c) is a guide portion formed at the tip of the stay ○, and the guide portion (22c) allows the second jig ( 6) can be guided so as to match the first jig (4) when it is moved to the welding position.

Further, each of the workpiece take-out devices (7') is shown in FIGS.
As shown in the figure, orthogonal 3 with the front-back direction, the lateral direction, and the up-down direction.
A slide frame (7a) that is movable in the axial direction is provided with a support arm (7b) that can be inserted into the internal space of the fork member A, and a longitudinal rail (
7c) moved by the cylinder (7d)
A slider (7c) is provided, and the first slider (7c) is provided.
e) A second slider (7g) that is moved by a cylinder (7g) along a longitudinal guide rod (7f) in the longitudinal direction
7h), the slide frame (7a) is slidably supported on the second slider (7h) by a rod (71) extending downward, and a cylinder (7j) is provided vertically on the second slider (7h). ) to the slide frame (7).
a), and thus the slide frame (7a) can be moved vertically by the operation of the cylinder (7j), horizontally via the first slider (7e) by the operation of the cylinder (7d), and horizontally by the operation of the cylinder (7d). The second slider (7h) allows movement in the front and back directions.

Further, as shown in FIGS. 1, 6, and 7, each setting device (+21) is a movable member (12a) movable in the horizontal direction and the vertical direction, and a fork member on the conveyor (1). The movable member (12a) is an elevating member (12e) that is moved vertically by a cylinder (12d) along a longitudinal guide rod (12c). ), the movable member (12a)
on the horizontally long guide bar (12f') fixed to the
The elevating member (12e) is slidably supported by the elevating member (12e).
The piston rod of a cylinder (12g) installed horizontally is connected to the movable member (12a), and the
) can be moved laterally by actuation of a cylinder (12g), and vertically via an elevating member (12e) by actuation of a cylinder (12d).

Each of the gripping tools (12b) is attached to a support shaft (121) on the lower side of a cylindrical bracket (12h) provided on the movable member (12a).
), each lever (12k) is provided with a pair of left and right claw pieces (12j) that rotate with
from the piston rod of the cylinder (121) provided above the bracket (12h).
) and is connected to the actuating rod (12+g) extending downward, so that both claw pieces (12+g) are activated by the operation of the cylinder (12+).
j) can be operated into a gripping state in which it abuts both sides of the fork member A, and an open state in which it separates from the fork member A.

Furthermore, the setting device (+21) gripper (12b) shown by X in FIG. The fork member A being conveyed is rotated 1800 times and the second
It can be set on a jig (6).

To explain this in detail, the bracket (1
2h) is supported by the movable member (12a) via a bearing (12n) as shown in FIG.
2a) The output gear (12q) of the low reactor (12p) provided above is fixed to the outer periphery of the bracket (12h), and the gripping tool (12b) is thus rotated by the actuation of the actuator (12p). I tried to get it.

Further, as clearly shown in FIGS. 8 and 9, the transfer device aΦ includes two swing arms (14a) (14a) corresponding to the two welding devices (2) (2), and A gripping tool (14b) for removably gripping the fork member A is provided at the tip of each swinging arm (14a) in a freely undulating manner, and each swinging arm (14a) extends downward on a fixed base (14c). It is attached to the support shaft (14d) via a bearing (14e), and the output gear (14g) of the rotary actuator (14f) on the fixed base (14c) is fixed to the support shaft, and the rotating arm ( At the tip of the bottle (14a)
A cylinder (14) attached to the arm (14a) is provided with a bracket (141) that can freely rise and fall around the arm (14a).
The piston rod of j) is connected to the bracket (141), and the gripping tool (14b) is fixed to the bracket, so that each of the six gripping tools (14b) is operated by the rotary actuator (14r). Swivel arm (14a)
moving to a fork member receiving place where the fork member A is received from the workpiece take-out device (7) via the fork member receiving place and a fork member discharging place where the re-gripping tool (14b) approaches;
The bracket (141) is moved by the operation of the cylinder (14j).
The undulation motion can be given through the .

The gripping tool (14b) includes a plate (14k) attached to the bracket (141), a contact piece (141) that comes into contact with the fork member A, and a gripping arm (14n) that is rotatable around the bottle (14m). a pair of gripping arms (14n) and a lever (14p) protruding inwardly from the gripping arms (14n), respectively, and
14k) is provided with a cylinder (14q), and the cylinder (14q) is provided with a cylinder (14q).
Both levers (14q) are attached to the step at the tip of the piston rod.
4p), and thus the gripping arms (14n) are brought into a gripping state in which they abut against the side surface of the fork member A and in an open state in which they are separated from the fork member A by the operation of the cylinder (14q). I made it work.

C on the drawing! Φ is the fork member A attached to the gripping tool (14b).
A proximity switch detects whether the item is gripped, and ■ is a delivery station (a delivery conveyor extending horizontally from 13).
■ indicates a welding robot.

Next, the operation of the embodiment will be explained.

First, the fork member setting device (2) is operated to receive it from the conveyor (1) and transfer it to the second welding device (2).
Set it on the jig (6), then raise the movable frame (5), move the second jig (6) to the welding position, and place the positioning bin (
9) Protrude.

According to this, the positioning pin (9) is fitted into the positioning hole (IO) of the machine frame (3) through the fork member A, and the first
The fork member A and the second jig (6) are accurately positioned with respect to the jig (4).

Next, by operating the clamping means (li) to the clamping side, the second jig (6) is clamped to the first jig (4), and the fork member A is sandwiched between both jigs (4) (6). Then, the flange portions of the inner panel A1 and the outer panel A2 are brought into close contact with each other, and in this state, the welding robot 2 edges-welds the flange portions of the inner panel A1 and the outer panel A2. In this case, since both panels AI and A2 are in a vertical position, the bead does not shift to the side of the panel, and therefore the fork member can be welded with a good appearance. 72 Next, insert the positioning bottle (9) and tighten the clamping means (1).
1) to the unclamp side, the movable frame (5) is laid down, and the second jig (6) is moved to the set position. in this case,
Movement of the second jig (6) to the set position 1; First, protrude the support pin ('I9) and insert it into the through hole of the fork member A, and move the fork member A to the first jig using the extrusion tool aε. (4). According to this, the fork member A is supported by the first jig (4) in a vertical position.

Next, the slide frame (7a) of the workpiece take-out device (7) is moved so that the support arm (7b) is located directly below the fork member A, and is raised to remove the support arm (7b).
) into the internal space of the fork member A, then move the slide frame (7a) forward to remove the fork member A from the support pin (1!!+), and move it laterally to remove the fork member A. The support arm (7
The fork member A supported in step b) is received by the gripper (14b), and then the slide frame (7a) is lowered to remove the support arm (7b) from the fork member A, and then the fork member transfer device a41 Both rotating arms (14a) (1
4a) to move the re-gripping tools (14b) (14b) to the fork member dispensing location, and then
b) (14b) is laid down from the standing position and each gripper (14b) is
4b), both fork members A and A move to the payout conveyor C! of the payout station a3. It is paid out in a horizontal position on Φ.

Further, after the second jig (6) is moved to the setting position, each fork member A on the conveyor (1) is set on each second jig (6) by the operation of the work setting device (+21),
By repeating the above operations, the left and right fork members A are successively and automatically assembled.

(Effects of the Invention) Since the present invention is constructed as described above, the present invention has the following effects.

According to the invention of claim 1, since the two-piece workpiece is welded in a vertical position, the bead does not sag to the side and welding can be performed with a good appearance. The next workpiece can be set on the tool, and there is no need for waiting time as in the above-mentioned conventional technology, which has the effect of improving productivity.

According to the second aspect of the invention, the two-piece workpiece and the second jig can be accurately positioned with respect to the first jig, and the two-piece workpiece can be held between the two jigs without any gaps.

According to the invention of claim 3, the left and right fork members of the front fork can be automatically assembled and delivered in succession, and both welding devices are installed on the side of the conveyor so that the back of the machine frame is Since the fork member transfer device is arranged in parallel so as to face each other, and the fork member transfer device is placed between the placement parts of both welding devices,
This has the effect that the assembly device can be configured compactly with good space efficiency.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a vehicle front fork assembly device equipped with the welding device of the present invention, FIG. 2 is an enlarged view taken along the line ■-■ in FIG. 1, and FIG. 3 is a diagram showing FIG. Figure 4 is a partially cutaway side view showing its operating state, and Figure 5 is a sectional view taken along the line ■-■.
The figure is an enlarged sectional view of the main part, Figures 6 and 7 are enlarged cross-sectional side views taken along lines Vl-Vl and ■-■ in Figure 1, respectively, and Figure 8 is a partially cutaway view of the fork member transfer device. The plan view, FIG. 9, is the IX- in FIG.
There is a sectional view taken along the IXX line. (1)...conveyor conveyor
(2)...Welding equipment (3)...Machine frame
(4)...First jig (5)...Movable frame
(5a)...Spindle (6)...Second jig
(7)...Workpiece take-out device (8)...Support base (9)...Positioning pin 11G...
Positioning hole (11)... Clamping means (1
21... Fork member setting device a3... Unloading station cU @... Fork member transfer device A... Fork member A1... Inner panel of fork member A2... Outer panel of fork member Fig. 6

Claims (1)

[Claims] In a device for sandwiching a set of one and two workpieces between a first jig and a second jig and welding the joints of both the workpieces, the first jig is placed on the vertical front surface of the machine frame. A movable frame is provided that is fixed vertically and is movable around a support shaft at the lower front of the machine frame, and the second jig is mounted on the movable frame. By raising and lowering the movable frame, it can be freely moved between a horizontal setting position where a two-piece workpiece is set and a vertical welding position where the two-piece workpiece is held between the first jig. A welding device for a two-piece set of workpieces, characterized in that a workpiece take-out device for taking out the workpieces from a first jig is provided on a side portion. 2. The second jig is mounted on the movable frame via a support base that can freely float in three orthogonal axes directions, and a positioning pin that can be inserted into the through hole of the two-piece workpiece can be freely retracted from the support base. A positioning hole is formed in the machine frame into which the positioning pin can be inserted through the two-piece workpiece, and a clamp means is provided in the machine frame for clamping the second jig to the first jig. 2. The welding device for two-piece workpieces according to claim 1, further comprising: a welding device for welding two-piece workpieces. 3. In a vehicle front fork assembly device that welds an inner panel and an outer panel constituting each of the left and right fork members of a front fork, a conveyor is provided to transport the left and right fork members that are a combination of the inner panel and the outer panel. , on the side of the conveyor, as claimed in claim 1.
Alternatively, a pair of the welding devices described in 2 is arranged side by side so that the back surfaces of the machine frames face each other, and a pair of fork members is received from the conveyor and set on the second jig of both welding devices. A fork member setting device is provided, and a fork member discharging station is provided between the placement parts of both welding devices, and the fork members are received from the workpiece take-out devices of both welding devices and brought close to each other to be placed in a horizontal position. A front fork assembly device for a vehicle, characterized in that a fork member transfer device for dispensing at a dispensing station is provided.