Method for cutting Y bevels

Details Method for cutting Y bevels Method for cutting Y bevels

1999-08-03

2001-12-04

Elve, M. Alexandra (Department: 1725)

Electric heating

Metal heating

By arc

C219S121440, C219S121600, C219S121410, C219S121390, C219S121670

Reexamination Certificate

active

06326588

ABSTRACT:

BACKGROUND OF INVENTION
This application is related to DE 198 35 057.0 filed on Aug. 04, 1998, which is incorporated by reference in its entirety for all purposes.
The invention relates to a method for cutting Y bevels by means of a laser.
It is often essential to chamfer sheet-metal edges, for example in shipbuilding or in the construction of plant and machinery, in order for a subsequent welding process to be carried out. The chamfering of sheet-metal edges by means of inclined laser cutting on the isolated component is described in Laser 5, 1997, pp. 6-10. In such a method, firstly a vertical cut has to be carried out using the laser, and then the top part of the cut surface has to be removed by means of an inclined cut. This method has the drawback that the leftover metal sheet has to be removed from the cutting bench in order to create sufficient space for the slag to be expelled during the inclined cutting operation. Otherwise, there is a risk of the product and the leftover metal sheet fusing together. A handling operation is required for the leftover metal sheet to be removed. This operation entails the drawback that the position of the component (product) may change.
Cuts made in the reverse order (firstly inclined cut, followed by vertical cut) do not give a satisfactory result. The inclined cutting gap prevents a clean vertical cut from being formed, since the slag cannot be expelled cleanly downwards.
SUMMARY OF INVENTION
The invention is based on the object of providing a method which does not have the drawbacks mentioned above.
In accordance with this invention components are produced with a beveled cut edge (Y bevel) wherein a vertical laser beam makes at least one vertical cut through the material. Parts of the material outside the flat component are removed. An inclined laser beam then makes an inclined cut along the vertical cut edge produced on the component. After the vertical cut edge has been produced, a position-detection device detects the position of the component produced and the information is transmitted to a control unit.


REFERENCES:
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patent: 3604890 (1971-09-01), Mullaney
patent: 4648298 (1987-03-01), Sutton
patent: 4827436 (1989-05-01), Sabersky et al.
patent: 4856902 (1989-08-01), Wiedemann
patent: 5286006 (1994-02-01), Ogura
patent: 5400145 (1995-03-01), Suita et al.

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