JPH0634073Y2 - Work positioning jig replacement device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a replacement device for replacing a work positioning jig for positioning and mounting a work on a processing machine, and particularly for replacing a work positioning jig of an arc welding machine. Regarding the device.

[Conventional technology]

An arc welder having a robot is conventionally configured as shown in FIG. 5, for example. In the figure, a robot 6 and a work positioning jig 3 are fixed on a surface plate 1 by a plurality of bolts 4 and 5, respectively, and welding cables from an arc welding power source 2 separate from the surface plate 1 are provided. 22 is connected to the arc welding torch 7 at the tip of the robot 6. Further, the work positioning jig 3 is composed of several parts, and the relative position accuracy with respect to the robot 6 is secured by being fixed on the same fixed plate 1 by the bolts 5. Then, the worker 8 sets the work 9 on the work positioning jig 3 and performs welding by the robot 6.

As a proposal of this kind, a pallet transfer / exchange device described in JP-A-61-297047 is known.

[Problems to be solved by the device]

In the conventional arc welder configured as described above,
The robot can set dozens of welding programs, but the work positioning jig was made specifically for the shape of the work. For this reason, the types of products that can be welded depend on the jig, and in the past, new types were the limit for the same jig.

Therefore, if the shape of the work is changed or a new setting is made due to product design change or model change,
Although it is necessary to change the work positioning jig, according to the structure of the conventional welding machine as shown in Fig. 5, the production of the current product is temporarily stopped and the jig is modified, or the jig is shared. It was necessary to take measures such as remodeling or partial setup change at any time to continue production, or to manufacture a new welding machine.

However, the temporary suspension of the first production is impossible due to the necessity of continuous production of parts, and the second jig modification puts a large constraint on the product design. However, there was a problem that it was not rational.

These problems result from the fact that the work positioning jig cannot be easily and quickly replaced with respect to the main body of the welding machine. That is, in FIG. 5, removing the bolt 5 to carry the workpiece positioning jig 3 out of the machine means dismantling the jig 3 composed of a plurality of pieces, and it takes much time to restore the outside of the machine. And needed effort.

Further, the proposal described in the above-mentioned publication is to automate the work of supplying and storing the work to the pallet and the transfer and exchange work of the pallet, and no consideration has been given to the replacement of the work positioning jig.

Further, the vehicle body welding assembly line described in Japanese Patent Laid-Open No. 60-240388 is provided with a positioning unit for positioning the vehicle body conveyed to each of a plurality of welding stations arranged in series with each other. A vehicle body is assembled by welding a vehicle body positioned at a station, and a rail laid along the transportation direction of the vehicle body, and a trolley provided on the rail and provided with a vehicle body positioning unit. Since it is provided with a fixing device for fixing the trolley at a predetermined position so that it cannot run, this is not a replacement device for replacing the work positioning jig.

The present invention has been made in view of the above circumstances, and the work positioning jig can be easily and accurately replaced at a predetermined position in an extremely short time, which can improve productivity and reduce equipment cost. An object is to provide a work positioning jig replacement device.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a pair of wedge-shaped rails in parallel on a surface plate, and a small surface plate is movably mounted on the rails via V-groove wheels. In a work positioning jig replacement device in which a work positioning jig is fixed on a surface plate, a V groove wheel of the small surface plate is rotatably supported at one end of an L-shaped arm, and the arm is attached to an end surface of the small surface plate. A jack bolt, which is rotatably attached to a fixed bracket and is in contact with the bracket at a substantially right angle, is screwed to the side of the arm opposite to the one end where the wheel is supported. Is a pair of fixing members whose contact surfaces are respectively wedge-shaped and flat on both sides in the front with respect to the traveling direction, and another fixing member with a conical contact surface at the rear center with respect to the traveling direction. Positioning and fixing consisting of members Stage is a work positioning jig transfer apparatus which comprises a.

[Action]

According to the above configuration, when the workpiece positioning jig is replaced, after the positioning fixing of the small surface plate to the surface plate is released, the work piece is moved on the rail provided on the surface plate through the wheels attached to the small surface plate. Move the small surface plate and carry it out of the machine. Then, another small surface plate to which another workpiece positioning jig is fixed is similarly loaded into the machine, and this small surface plate is fixed to the fixing member receiving metal fittings provided on the surface plate by the positioning fixing means. The workpiece positioning jig can be replaced accurately in a short time.

〔Example〕

An embodiment of a work positioning jig replacement device according to the present invention will be described below with reference to the drawings.

1 to 4 show one embodiment of the present invention. In the figure, parts that are the same as or equivalent to those of the conventional example shown in FIG.

In FIGS. 1 and 2, a robot 6 is fixed to one end of the surface plate 1 by bolts 4 as in the conventional example.
A welding torch 7 is attached to the robot 6. On the surface plate 1, a pair of rails 10 having a wedge-shaped cross section of the robot 6 are provided in parallel.

On the other hand, a pair of V-groove wheels 12 are provided on both end surfaces of the small surface plate 11 in the traveling direction, and the small surface plate 11 is movable by engaging these wheels 12 with the rails 10. hand,
A work positioning jig 3 including a plurality of members is fixed on the small surface plate 11. The wheel 12 is engaged with the rail 10 to position the jig 3 at right angles to the traveling direction of the jig 3, and the cross section of the rail 10 has a wedge shape to prevent foreign matter such as spatter during welding. It prevents dust and dirt from accumulating on the rail 10.

The wheel 12 is rotatably supported on one end of an L-shaped arm 13 as shown in FIG. 3, and the arm 13 is attached to a bracket 14 fixed to the end surface of the small surface plate 11 via a shaft 15. It is rotatably attached. Also the wheels of arm 13
A jack bolt 16 that is in contact with the bracket 14 at a substantially right angle is screwed to one end opposite to the one end on which 12 is supported. Then, heavy objects such as the small surface plate 11 and the work positioning jig 3 are supported on the rail 10 through the jack bolts 16, the arms 13 and the wheels 12, and the jack bolts 16 are rotated to remove the heavy objects. It can be lifted with a light load.

Further, fixing members 17 and 18 for positioning and fixing the small surface plate 11 to the surface plate 1 are provided near one ends of both side surfaces parallel to the traveling direction of the small surface plate 11, respectively. The contact surfaces of the parts fixed to the small surface plate 11 side and the parts fixed to the surface plate side of wedges 17 and 18 are respectively wedge-shaped and flat. Further, another fixing member 19 as shown in FIG. 4 is provided at the center of the small surface plate 11 in the direction perpendicular to the traveling direction, and the contact surface is conical.

Then, the contact surfaces of these fixing members 17, 18, and 19 are brought into close contact with each other, so that the vertical, front-rear, left-right, and rotational positions of the small surface plate 11 on the surface plate 1 are, for example, ± 0.5 mm or less. It can be easily and repeatedly reproduced with high accuracy. The pair of upper and lower fixing members 17, 18 and 19 are fixed by bolts 20, respectively.

Next, a procedure for replacing the work positioning jig 3 of the arc welding machine having the robot according to the present embodiment will be described.

First, the bolt 20 fixing the pair of upper and lower fixing members 17, 18, 19 is removed, then the jack bolt 16 is screwed in, and the arm 13 is rotated about the shaft 15 in the direction of arrow A to rotate the wheel.
With the fulcrum 12 as a fulcrum, the small surface plate 11 is raised until the contact surfaces of the fixing members 17, 18, and 19 are separated from each other. In this state, the small surface plate 11 is moved on the rail 10 via the wheels 12 and carried out of the machine.

Next, another small surface plate provided with a work positioning jig for another work and prepared outside the machine is moved on the rail 10 and carried into the machine. At this time, a small surface plate is brought into contact with a stopper 21 mounted on the rail 10 at a depth of a few mm from a fixed position for rough positioning. Then, the above-described operation is performed in the reverse order to fix the small surface plate on the surface plate 1.

According to this embodiment, the rail 10 is provided on the surface plate 1, and the rail 10 is a small surface plate to which the work positioning jig 3 is fixed.
Since 11 is conveyed, it can be easily replaced with another small surface plate 11 to which a work positioning jig for another work prepared outside the machine is fixed, for example, for 1 to 2 hours. It became possible to replace in an extremely short time.

As a result, when the design of the product is changed, it is possible to manufacture the jig 3 only by newly manufacturing it, and it is possible to improve the productivity and reduce the equipment cost. Further, if the widths of the rails 10 are made equal, the jigs 3 can be interchanged with other welding machines, and the jigs 3 can be promptly used as temporary equipment in case of mechanical failure. Furthermore, it can be easily converted to other uses as a welding machine, and the service life of the equipment can be extended.

In the above embodiment, the work positioning jig replacing device of the arc welding machine having the robot has been described, but the same effect can be obtained by applying it to the work positioning jig replacing device of another processing machine.

[Effect of device]

As described above, according to the workpiece positioning jig replacement device according to the present invention, a pair of wedge-shaped rails are provided in parallel on the surface plate, and a small surface plate can be run on the rails via V-groove wheels. Since the V-groove wheel is engaged with the rail, positioning is performed in the direction perpendicular to the traveling direction of the jig, and the wedge-shaped cross section of the rail prevents spattering during welding. Since it is possible to prevent foreign matters and dust from accumulating on the rails, the small surface plate can be smoothly run, and the V-groove wheel of the small surface plate is rotatably supported at one end of the L-shaped arm, and the arm is the above-mentioned. Is a jack bolt rotatably attached to a bracket fixed to the end surface of a small surface plate, and is a jack bolt screwed on the side of the arm opposite to the one end on which the wheel is supported to contact the bracket substantially at a right angle? , Can very easily by vertical movement of heavy, such as small surface plate and the work positioning jig rotates the jack bolt, a set operation when replacement is extremely simple.

Further, the small surface plate has a pair of fixing members whose contact surfaces are respectively wedge-shaped and flat on both sides in the front with respect to the traveling direction, and another fixing member having a conical contact surface at the rear center. Since the positioning fixing means arranged in a triangular shape is brought into close contact with the fixing member receiving metal fittings provided on the surface plate, the upper and lower parts are replaced when the small surface plate is replaced on the surface plate. The effect is that the front-rear, left-right, and rotational positions can be repeatedly reproduced with extremely strict accuracy.

Therefore, the work positioning jig replacement device according to the present invention can replace the work positioning jig in a very short period of time with a very high accuracy, and it is possible to improve productivity and reduce equipment costs. have.
As a result, when the design of the product is changed, it is possible to easily perform the production by manufacturing only the jig, and it is possible to improve the productivity and reduce the equipment cost.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a work positioning jig replacing device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a side view showing a wheel portion of FIG. FIG. 4 is a longitudinal sectional view showing the fixing member 19 of FIG. 1, and FIG. 5 is a side view showing an arc welding machine having a conventional robot. 1 …… Surface plate, 3 …… Workpiece positioning jig, 10 …… Rail, 11 …… Small surface plate, 12 …… Wheels, 17,18,19 …… Fixing member.

Claims (1)

[Scope of utility model registration request] 1. A pair of wedge-shaped rails are provided in parallel on a surface plate, a small surface plate is movably mounted on the rails via V-groove wheels, and a work is positioned on the small surface plate. In a work positioning jig replacement device with a fixed jig, a V-groove wheel of the small surface plate is rotatably supported at one end of an L-shaped arm, and the arm is rotated by a bracket fixed to an end surface of the small surface plate. A jack bolt, which is movably attached to the arm, is attached to the side opposite to the one end where the wheel of the arm is supported. On the other hand, the positioning is made up of a pair of fixing members whose contact surfaces are respectively wedge-shaped and flat on both front sides, and another fixing member whose contact surface is conical on the rear center with respect to the traveling direction. It is equipped with fixing means Work positioning jig replacement apparatus characterized.