Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Reexamination Certificate
1999-11-12
2001-03-06
Wellington, A. L. (Department: 3722)
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
C072S126000, C451S065000, C029S402190
Reexamination Certificate
active
06195860
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for dressing welding electrodes and in particular in automatic welding stations.
It is known that the electrodes which make contact with the sheet metal to be welded are the consumable part of a resistance welding system. For reasons of conductivity and contact resistance the electrodes must be made of nearly pure copper which is well known to be a ductile and malleable material. During use the electrodes are subject cyclically to high pressures with high temperatures and undergo a plastic deformation process which changes their shape to the detriment of welding quality. To limit deterioration of quality beyond acceptable limits in practice devices termed electrode dressers which periodically mill the upset material with small shaped milling cutters to restore the original shape of the electrode tip are used.
Since the dressers work by material removal they can only intervene a small number of times. The dressing operations are therefore spaced in time and between one operation and the next the quality of the welding tips undergoes progressive deterioration to the limit of acceptability. However, the dressers removing material shorten considerably the useful life of the electrodes with resulting increase in operating costs.
The general purpose of the present invention is to overcome the above mentioned drawbacks by making available a dressing device which could be used frequently with optimal results and without limiting the useful life of the electrodes.
SUMMARY OF THE INVENTION
In view of this purpose it is sought to provide in accordance with the present invention a device for welding electrode dressing in particular in automated welding stations and comprising an electrode treatment head fitted with upsetting members which reshape the electrode tip inserted in it without removing material.
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Cappa Sergio
Di Rosa Gaetano
Rossi Cristiano
Ergenbright Erica
Fata Automation S.p.A.
Jacobson Price Holman & Stern PLLC
Wellington A. L.
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