Patent DE-102012100881-A1 (DE)
Title: Providing workpiece e.g. sheet metal with object structures by laser beam, where each structure comprises boundary line with first linear portions, and first linear portions of lines of first object structures lie on first straight line
Inventor: PETSCHIK NORBERT
IPC: B23K26/02
Filed: 2012-02-02
Abstract: The method of providing a workpiece with object structures by a laser beam (3), is claimed, where each object structure comprises a boundary line with first linear portions. The first linear portions of the boundary lines of first object structures are present on a first straight line at a distance from each other. The first linear portions of the boundary lines of second object structures are present on a second straight line, different from the first straight line, at a distance from each other. The laser beam is linearly directed along the first and second straight lines. The method of providing a workpiece with object structures by a laser beam (3), is claimed, where each object structure comprises a boundary line with first linear portions. The first linear portions of the boundary lines of first object structures are present on a first straight line at a distance from each other. The first linear portions of the boundary lines of second object structures are present on a second straight line, different from the first straight line, at a distance from each other. The laser beam is linearly directed along the first and second straight lines so that the first linear portions of the boundary lines of first and second object structures, which lie on the first and second straight lines, are directly structured. The straight lines of the first straight lines run parallel to each other. A first part of the first straight lines run parallel to each other, and a second part of the first straight lines run parallel to each other. The first part of the first straight lines defines an angle with the second part of first straight lines. The laser beam is linearly directed along each of the straight lines of the first and second part of first straight lines. The boundary lines of the object structures comprise second linear portions, where the second linear portions of the boundary lines of the object structures lie on the respective straight line of the second straight lines at a distance from each other. The laser beam is linearly directed along each of the straight lines of first straight lines so that the first linear portions of the boundary lines of the object structures, which lie on the respective straight lines of the first straight lines, are directly structured to each other. The laser beam is linearly directed along each of the straight lines of second straight lines so that the second linear portions of the boundary lines of the object structures, which lie on the respective straight lines of the second straight lines, are directly structured to each other. The boundary lines of the object structures further comprise third and fourth linear portions, where: the third linear portions of the boundary lines of each of the object structures lie on the respective straight line of third straight lines at the distance from one another; and the fourth linear portions of the boundary lines of each of the object structures lie on the respective straight line of fourth straight lines at the distance from one another. The straight lines of the third straight lines are parallel to the straight lines of the first straight lines. The straight lines of the fourth straight lines are parallel to the straight lines of the second straight lines. The straight line of the first straight lines is located between the two straight lines of the third straight lines. The straight line of the fourth straight lines is located between the two straight lines of the second straight lines. The laser beam is linearly directed along the straight lines of the first and third straight lines so that the first linear portions of the boundary lines of each of the two object structures, which lie on the straight lines of the first and third straight lines, are directly structured. The laser beam is linearly directed along the straight lines of the second and fourth straight lines so that the second and fourth linear portions of the boundary lines of each of the two object structures, which lie on the straight lines of the second and fourth straight lines, are directly structured. The first linear portions are structured in a first direction. The third linear portions are structured in a third direction. The second linear portions are structured in a second direction. The fourth linear portions are structured in a fourth direction. The first direction is opposite to the third direction, and the second direction is opposite to the fourth direction. The straight lines are present nearer to the laser beam. The method is performed optionally or repeatedly until the material is removed under formation of a through hole by the workpiece. The laser beam is individually directed by a galvanometer mirror deflection device (4), where the workpiece is individually moved by a movable support (6). A flank angle of the object structures is adjusted, in which the laser beam with the repeated structures is linearly directed along the respective straight line with the respective predetermined deviation transverse to the respective straight line. The object structures are regular objects. The laser beam is produced by an ultra short pulse laser device (5).