Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – Means for removing surface material – e.g. – scarfing
Patent
1992-11-25
1994-05-17
Kastler, Scott
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
Means for removing surface material, e.g., scarfing
266 48, B23K 706
Patent
active
053120914
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a device for deburring especially a continuously cast steel strip cut into slabs.
2. Description of the Related Art
In continuous casting of steel, a product is obtained which has the shape of a thick steel strip which has to be cut into specified lengths so as to obtain slabs which are then processed in rolling operations.
The steel strip coming from the continuous casting is cut into slabs by oxygen cutting with the aid of a torch which projects its blast perpendicularly to one of the principal faces of the strip.
The action of the cutting blast of the torch leads to a kerf in the metal, a kerf which forms a cut when the torch is moved over the strip.
The drawback of oxygen cutting resides in the fact that it causes burrs from molten steel on the principal face opposite that receiving the cutting blast from the torch.
These burrs constituted by oxygen cutting residues are formed on either side of the cut because of the disturbance from the removal of the cutting residues generated by the expansion of the residual gases at the exit of the said cut.
This phenomenon causes a bonding of the nonremoved residues on each edge of the cut on the lower face of the slab.
In order to get rid of these burrs, up until now several solutions have been used.
One solution consists in manually grinding away the burrs.
Another known solution consists in using a machine comprising a set of cutting blades.
These blades are carried by a carriage which moves along the longitudinal axis of the slab below the lower face of the latter. These blades come into contact with the said lower face and cut off the oxygen cutting residues.
These solutions have drawbacks.
The reason for this is that they require an additional operation on the slab, distinct from the oxygen cutting operation, involving thereby the installation of a deburring unit with the extra cost and maintenance which stem therefrom.
SUMMARY OF THE INVENTION
The object of the present invention is to propose a deburring method and a device for implementing this method, enabling the formation of burrs to be avoided during the oxygen cutting operation and thereby the additional unit for deburring the slabs to be eliminated.
The subject of the present invention therefore is a method for deburring especially a steel strip cut up into slabs, with the aid of an oxygen cutting torch whose blast is perpendicular to one of the principal faces of the strip, characterised in that a blast of fluid which is inert with respect to the blast from the torch is directed onto the principal face of the strip opposite the said principal face receiving the blast from the oxygen cutting torch and in the cutting zone of the strip.
According to other characteristics of the invention:
the blast of fluid possesses a horizontal opening angle and a vertical opening angle lying between 10.degree. and 40.degree.,
the blast of fluid is formed from two blasts directed one towards the other and intersecting in a zone comprising the axis of the oxygen cutting torch,
the blast of fluid is formed from three blasts directed one towards another and intersecting in a zone comprising the axis of the oxygen cutting torch,
the blast or blasts of fluid are formed by a flat blast whose horizontal opening angle lies between 10.degree. and 40.degree.,
the inert fluid is air or nitrogen,
oxygen is added to the inert fluid in a proportion of from 10.degree. to 40.degree..
The subject of the present invention is also a deburring device for the implementation of this method, comprising an oxygen cutting torch perpendicular to one of the principal faces of the strip, the said torch being moveable, on the one hand in a direction transverse to the direction of advance of the strip, and on the other hand in a direction parallel to the said direction of advance and at an identical speed to the strip, characterised in that it comprises means for blowing a pressurised fluid into the cutting zone on the other principal face of t
REFERENCES:
World Patents Index, Section Ch, Week 7722, Derwent Publications, Ltd., London, GB; Class M, AN 77-38716Y & JP,A,5 248 544 (Nippon Oxygen KK) Apr. 18, 1977.
Innovation Process Vogrin
Kastler Scott
Sollac
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