Gear cutting – milling – or planing – Milling – Process
Patent
1999-01-11
2000-12-05
Briggs, William
Gear cutting, milling, or planing
Milling
Process
29 33A, 409293, 451 5, B23C 312
Patent
active
061557579
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a deburring method, primarily in the workshop industry after a milling operation, for instance.
BACKGROUND ART
When a surface is machined by milling, casting components in metallic material or injection-moulding plastic components, for instance, burrs are formed at the edge of the surface, i.e. where the surface joins a second surface inclined in relation to said first surface. Previously burrs have been removed manually or by following the burr edge with a milling tool provided with a power sensor, the milling tool being pressed against the edge of the burr with a constant pressure in order to remove the burr. Performing manual deburring is a time-consuming operation and thus not cost efficient. Performing deburring with a milling tool provided with power sensor results either in the burrs remaining being too large, or in the edge being damaged, if the tolerance requirement is high.
OBJECT OF THE INVENTION
The object of the present invention is to provide a method for deburring machined workpieces that solves the problems entailed in previous deburring methods. Another object is to control a robot system for a fully automatic deburring operation.
Specific to the present invention is the method of taking a reading, calculating and extrapolating a cutting curve between two surfaces, and controlling a positioning head provided with a deburring tool in relation to the calculated cutting curve of the workpiece.
SUMMARY OF THE INVENTION
Using a laser of linear type, for instance, to scan an edge provided with burrs, an image is obtained which represents the defining line of a first surface and the defining line of a second surface. In view of the extension of the burr over the cutting curve of the surfaces a discontinuity is obtained caused by the bundle of laser rays being shadowed in the image obtained. This discontinuity is eliminated through an extrapolation calculation of the shaded surface in the direction of the unshaded surface in the imagine, thereby giving the cutting curve. A deburring tool is then controlled to cut along the cutting curve.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings.
FIG. 1a shows a laser-illuminated edge of a workpiece with burrs, before being deburred by the method according to the present invention.
FIG. 1b shows a laser-scanned image according to FIG. 1a.
FIG. 1c shows extrapolation to the cutting curve.
FIG. 1d shows the result of the extrapolation according to the invention.
FIG. 2 shows the edge with burrs, seen from above.
FIG. 3 shows the result after deburring according to the invention.
DESCRIPTION OF THE INVENTION
A burr 2 has been formed on the edge of a workpiece 1 after a milling operation, for instance, and must be removed. For this purpose a linear laser 3 is used in conjunction with a deburring tool. The laser 3 with its bundle of rays 4, illuminates the burr and thus the edge line of the workpiece through an angle a where a is chosen so that the laser illuminates the adjoining surfaces in suitable manner. The angle a is determined taking into consideration the size and extension of the burr. A suitable choice for the laser setting is for the laser 3 to be directed towards the edge line of a workpiece (1) with burrs through the angle .alpha. between the illumination direction and the burr-emanating second surface, where 90.degree.<.alpha.<180.degree.. After an evaluation, the result of the laser illumination produces an image, see FIG. 1b, defined by a first surface, the adjoining surface 5, and a second surface the burr surface 6. This laser image is determined in relation to the deburring tool as to position and appearance. The laser image then undergoes calculation to determine which of the two surfaces is deemed to be the burr surface 6, whereupon the other surface is consequently defined as the adjoining surface 5. After this calculation an extrapolation of the adjoining surface 5 is performed towards the b
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patent: 5280171 (1994-01-01), Halter
patent: 5321914 (1994-06-01), Husson
patent: 5940302 (1999-08-01), Pryor
Briggs William
Neos Robotics AB
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