Electric heating – Metal heating – By arc
Patent
1996-04-25
1999-03-23
Mills, Gregory L.
Electric heating
Metal heating
By arc
358297, 21912162, B23K 2600
Patent
active
058863176
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process for engraving a pattern into the surface of a work piece.
A device and a process for contact-free engraving by means of a laser is known from the patent document U.S. Pat. No. 4,156,124. A laser beam is, by means of a mask apparatus, directed onto the surface of a work piece. The said mask may be either transparent or reflective. The laser beam is transmitted by means of an optical device, and the image of the mask is thus cast onto the surface of the work piece. The mask and the work piece are held in parallel to one another at a fixed distance and position. The source of the laser beam is moved relative to the mask and the work piece surface, so that the laser beam migrates over the mask and, as a result, the surface of the work piece. By means of the mask, the intensity of the laser beam is changed in a manner which is dependent upon location and, consequently, the effect of the laser beam on the surface into which the pattern thus presented through the mask is engraved, as well. Only simple and rough patterns can be engraved by means of such a process and such an apparatus. In addition, the production of the masks is complicated and expensive. The masks are limited, so that only limited patterns can also only be engraved.
A device for the engraving of different types of letterings into a surface is known from the patent document U.S. Pat. No. 4,734,558. The ray coming from the laser is expanded to a parallel beam, which proceeds through a mask which can be controlled in a manner specific for location, and which mask acts as a screen, and corresponds to the lettering which is to be engraved. The image of the mask is cast onto the surface which is to be engraved. The mask is a light valve in the form of a liquid crystal, the permeability of which is controlled, in a manner dependent on location, by an image which is cast by the screen of a cathode ray tube onto the liquid crystal. The image on the cathode ray tube, which corresponds to the character which is to be engraved, is supplied by a microcomputer. Several stored memories to be engraved, which can be selected by means of switches which can be activated by hand, are stored in the memory in this microcomputer.
In this known device, therefore, metallic masks are replaced by an optical mask which is controlled by means of a mask generator. The characters which are to be engraved are of a simple nature, and must first be stored in memory in the mask generator by means of a special program.
A process which is essentially similar to the type which has just been described, in which the mask is likewise variable, is already known from the patent document DE 42 13 106 A1. The variation is brought about by means of a different digital control. The engraving is carried out in successive layers, one after the other. The numerical control of the mask permits only simple mask images, and thereby simple engraving patterns as well. The numerical control is brought about, for example, by means of one or several rotating aperture disks, the aperture images of which come to cover a specific configuration. The patterns are thus always regular. Small image elements are thus assembled into larger image fields in which, because of their regularity, they make a seamless transition into one another. Irregular patterns, such an assembly of image elements into larger image fields, is not possible without the appearance of visible boundary lines.
A process is the type which is stated in the introductory portion of claim 1 is known from the patent document U.S. Pat. No. 4,629,858, in which a pattern on a sheet of paper is scanned by line by line and the intensity of a laser is controlled by the scanned signal, and is, in the same manner, directed line by line over a work piece in the shape of a carpet, so that a deep pattern which corresponds to the pattern of color on the paper pattern is burned into the surface of the same. The design pattern thereby has a size which corresponds to the size of the work piece. Th
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Hinrichs Hans-Helmut
Lange Gunter
Minke Jurgen
Mommsen Jens
Obert Markus
Benecke-Kaliko AG
Mills Gregory L.
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