Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1990-11-30
1992-12-08
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
266 48, B23K 710
Patent
active
051690535
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The instant invention relates to a heating device for a robot, such as a flame gas welding head designed for use with a robot.
BACKGROUND OF THE INVENTION
Welding robots are known which are designed to assemble parts, for example to weld electronic components onto a printed circuit. In the known devices, the welding operation is carried out using a mobile bit brought into contact with the part to be welded and a metal wire having a low fusion point maneuvered in such a manner that its extremity touches the parts to be welded when these are heated by the bit. Devices of this kind are easy, to manipulate since the temperature of the bit is low enough to ensure that the radiation which it generates does not affect the environment of the parts to be welded or the areas swept during passage from one working point to another. The quality of the weld obtained using a device of this type is unfortunately inferior to that achieved using a flame gas welding torch. This is due to the fact that the welding torch makes it possible to attain temperatures higher than those obtained using a bit and hence to obtain a more liquid weld, ensuring a better quality join.
Welding heads are also known which are designed to be mounted on a robot and equipped with a welding torch making it possible to use flame gas welding Nevertheless devices of this type have a disadvantage which complicates their use. The temperature of the burning gas is very high and can reach 2700.degree. C. The robot program thus has to provide for displacement of the head so that the flame cannot destroy or ignite any of the parts located on the working table. The flame consequently has to be moved back a considerable distance from the working surface when it is moved from one work station to another. As a result, the time taken to complete one operation is significantly lengthened.
One possibility would be to lower the flame or even extinguish it before moving the head. However, some fifteen seconds unfortunately elapse before the flame is stabilized after being lit, or after any substantial change in its intensity This, too, also lengthens the working time.
SUMMARY OF THE INVENTION
It is the object of the present invention to make it possible to use a flame gas in heating operations without having to reduce the speed of operation.
The instant invention therefore provides a flame gas heating device for use with a robot comprising a body adapted to be fixed to the robot, a support mounted on the body and a welding torch integral with the support. In addition, it comprises connecting means to ensure the mobility of the support on the body and an enclosure, whereby the support and the welding torch can occupy a first position in which the flame associated with the welding torch is capable of carrying out a heating operation and a second, rest position in which the flame is confined within the enclosure.
As a result of these features, the heating device can be moved from one point to another without risk of damage.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be illustrated by the following description of one embodiment with reference to the drawings in which:
FIG. 1 is a general view of a welding head according to the invention; and
FIGS. 2 and 3 show the support and the welding torch for use with the head of FIG. 1 from two different angles.
The welding head shown in FIG. 1 comprises a body 2, a support 4, a welding torch 6 mounted on the support 4 and connecting means 8 ensuring the mobility of the welding torch 6 and of the support 4.
DETAILED DESCRIPTION OF THE INVENTION
More specifically, the body 2 is composed of a mounting flange 10 adapted to mount the head on a robot, a rod 12 integral with the flange 10 and two frames 14 and 16 mounted on the rod 12. The frame 14 has a coil 18 and an unwinder 20 terminating in a tube 22. The coil 18 carries a metal wire 24 having a low fusion point inserted in the unwinder 20 and emerging from the free extremity of the tube 22. The frame 16 carries the connecting means 8. The
REFERENCES:
patent: 4475719 (1984-10-01), Lotz
patent: 4809956 (1989-03-01), Donze
Ramsey Kenneth J.
Schunk Automation A.G.
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