WO2013087448A2

WO2013087448A2 - Apparatus for machining material by means of a laser beam

Info

Publication number: WO2013087448A2
Application number: PCT/EP2012/074304
Authority: WO
Inventors: Carsten RÖSLER; Steffen Walter; André Lange
Original assignee: Scansonic Mi Gmbh
Priority date: 2011-12-14
Filing date: 2012-12-04
Publication date: 2013-06-20
Also published as: WO2013087448A3; WO2013087448A4; DE202011052291U1

Abstract

The invention relates to an apparatus for machining material by means of a laser beam (13), having an optical element (5) arranged in an optic housing (1) and having a guide (4) for a linear adjustment drive (6) that is movable in the Y direction laterally to the beam propagation direction (14) that takes place in the Z direction. In order to improve the apparatus with regard to even more precise alignment of the laser beam with the TCP (Tool Centre Point), a second guide (3) for a linear adjustment drive (2) that is movable in the Z direction parallel to the beam propagation (14) that takes place in the Z direction is provided, such that an adjustment of the optical element (5) and thus of the laser beam (13) in two directions, i.e. in the Y and in the Z direction, at the same time is possible.

Description

Device for material processing by means of a laser beam

The innovation relates to a device for material processing by means of a laser beam, with an optical element arranged in an optical element and with a guide for a in Y-direction laterally to the Z-direction beam propagation movable linear adjustment drive.

It is known that deviations of the beam focus of the laser beam of less than one millimeter from the seam joint can have a significant effect on the seam shape and can even lead to the tearing off of the joining process. Before the joining process or during assembly of the machining head of the device, the beam focus is adjusted to the TCP (Tool Center Point). A coarse alignment is usually done by interfaces that have flanges perpendicular to the direction of beam propagation. The flanges may be provided with slotted holes and locking screws, or have abutment surfaces, e.g. Pens, with fixed staged decentrations.

From DE 101 51 828 B4 an apparatus for laser beam soldering with a machining head with a Laserstrahlzu ^¬ guide device and with a focusing device and with a Lotmaterialstoffzuführungsseinrichtung is known in which the focusing device relative to the laser beam ^feeding device and relative to

Solder material is at least in one plane laterally or perpendicular to the beam propagation direction movable. In this case, the adjustment of the focusing device by a movable in a plane optics. A precise alignment of the laser beam to the TCP (Tool Center Point) is not possible with this known device.

The novelty is therefore based on the object to improve the device of the type mentioned in terms of an even more accurate alignment of the laser beam to the TCP (Tool Center Point).

To solve this problem, the innovation provides that a second guide is provided for a parallel in the Z-direction in the Z-direction beam propagation movable linear drive, so that an adjustment of the optical element and thus the laser beam in two directions is possible, the usually perpendicular to each other.

According to the innovation, two adjusting drives or adjusting mechanisms are thus integrated in an optical-mechanical module, which allow the abovementioned exact alignment of the laser focus. This allows a more precise alignment of the laser beam to the TCP (Tool Center Point) in processing optics. This alignment is required due to manufacturing tolerances of mechanical-optical components. An optical element is responsible for two Verstellimensionen, whereby this mechanism is space-saving than the use of two devices for only one Verstelldimension. The optical element to be adjusted is not exposed to machining forces, whereby the adjustment point can have a low rigidity. This allows the use of low-cost backlash adjustment and guiding mechanisms. Further advantageous embodiments of the innovation will become apparent from the dependent claims.

Innovation for the adjustment of the laser focus in the Z direction of the beam propagation and for the

Adjustment of the laser focus in the Y-direction lateral to

Direction of beam propagation, an optical element and a respective linear Versteilantrieb provided. Further, for adjusting the optical element in the Z direction, a motorized linear Versteilantrieb and for adjusting the optical element in the Y direction and laterally to take place in the Z direction beam propagation, a manual or a motorized linear Versteilantrieb is provided.

In another renewal embodiment is a

Guide for the adjustment of the optical element in the Y-direction fixedly mounted on the optical housing and guided in the guide Verstellellantrieb for

Guidance of the actuator for the Z-direction is on the guide for the optical drive

Element attached in the Z direction.

Finally, to adjust the optical element in a combination of Y and Z adjustment a

Arrangement provided in the manner of a cross table.

In a specific embodiment, the adjustment of the optical element in the Z direction by means of

Versteilantriebes two parallel aligned and in

Distance from each other arranged bearing rails in

Linear bearings out which receive the optical element between them. In this case, the optical element is arranged in a collimated beam and to form a retrofocus system from an objective lens with positive refractive power formed. Finally, that is

Connection of the module to the processing optics designed as a detachable change interface.

Without the integration of two adjusting drives in an opto-mechanical module according to the invention, it would be necessary in a conventional device, both for the adjustment in the direction of the beam propagation and for the adjustment perpendicular to the direction of beam propagation, in each case an optical element, each with an associated adjustment drive use.

An embodiment of the inventive device consists of the components: motorized linear drive for the adjustment of the optical element in the Z-direction and manual or motorized linear drive for the adjustment of the optical element in the Y-direction lateral to the direction of beam propagation, as well as guides for both adjusting drives.

The device according to the invention is characterized in that the focal position in a plane parallel to the direction of beam propagation is two-dimensionally adjustable with it. The adjustment in the direction of beam propagation by a motorized linear drive and the adjustment made laterally or perpendicular to the direction of beam propagation by a manual or motorized linear drive.

The renewal device for material processing by means of a laser beam is explained in more detail below with reference to the principle of operation and with reference to an embodiment shown in the figures. It shows: 1: the functional principle of the device, FIG. 2: a, b the schematically illustrated functional principle of the adjustment of the optical element in the Z direction of the beam propagation and in the lateral Y direction, FIG.

3 shows the functional principle of the adjustment of the optical element in the Z direction,

4 shows the basic representation of a parallelogram arrangement for adjusting the optical element in the Y direction,

5 shows an embodiment of the device in an external view,

6 shows the embodiment of the device according to FIG. 5 with the housing open, and FIG. 7 shows the view of the opened housing of FIG

Apparatus according to FIGS. 5 and 6.

According to FIG. 1, the following components are arranged within a box-shaped optical housing 1: an optical element 5 formed from a focusing lens, an adjusting drive 2 for adjusting the optical element 5 in the Z direction by means of a guide 3, ie in the direction of beam propagation 14 of the laser beam 13, and a guide 4 with an adjustment drive 6 for adjusting the optical element 5 in the Y direction laterally to take place in the Z direction beam 14 of the laser beam 13. In this case, the optical element 5 is arranged in a collimated beam 12 and a Objective optics formed with positive refractive power in the form of a retrofocus system. The connection of the module to the processing optics is designed as a detachable changeover interface.

As the principle of operation of the device according to FIG. 1 shows, the guide 4 for the adjustment of the optical element 5 in the Y direction is fixedly mounted on the optical housing 1. The guided in the guide 4 adjustment drive 6 for the guide 3 of the Versteilantriebes 2 for the Z direction is mounted on the guide 3 for the Versteilantrieb 2 of the optical element 5 in the Z direction. The adjustment of the optical element 5 in a combination of Y and Z adjustment is analogous to a cross table, as shown in Fig. 1 in principle with linear bearings. In the following operating principles, only the Z-adjustment with linear bearings is implemented. The Y adjustment takes place with a parallelogram 22 in the form of a solid-state parallelogram joint.

Further, as shown in FIG. 1, the Y-direction in a plane lateral to the Z-direction of the beam propagation 14 and the Z-direction in a direction and in a plane perpendicular to the Y-direction and Y-plane, respectively.

FIGS. 2a and 2b show schematically the functional principle of the optical adjustment. 2a shows the laser focus 16 in the lateral Y direction offset by the amount Y in the workpiece surface 15. FIG. 2b shows the laser focus 16 offset by the amount Z from the workpiece surface 15. Fig. 3 shows the principle of operation of the adjustment of the optical element 5 in the Z direction by means of

Versteilantriebes 2. In this case, two parallel aligned and spaced apart bearing rails 32 are guided in linear bearings 33 which receive the optical element 5 between them. The two bearing rails 32 are at their two free ends by intermediate segments 34th

connected, which are adjustable in the Y direction.

Here are two of the optical housing 1 associated with fixed points 23 for solid joints 10 of the parallelogram 22 and two other, also the optical housing 1 associated with fixed points 25 for the guide 3 with the Versteilantrieb 6 connected in the Y direction, guided in a housing-fixed thread adjusting screw 7 and shown for the biasing spring 9 in the Y direction. The parallelogram 22 includes two mounted in the housing fixed points 23 handlebars 26, 27 which are connected in arranged at the respective free end solid joints 28 with another arm 29, which carries the optical element 5 via a connecting rod 30. By operating the adjustment drive 6 by means of a Justagerädchens 31 via the adjusting screw 7 and the handlebar 26 and the handlebar 29 and the connecting rod 30 of the parallelogram 22 and against the action of the biasing spring 9 is an adjustment of the optical element 5 in the direction of movement 24, ie The Y-axis and perpendicular to the direction of beam propagation 14. A corresponding provision is made under the action of the biasing spring 9 when operating the adjusting drive 6 in the opposite direction. The illustrated in Fig. 5 in a perspective external view, compared to the schematic diagram in Fig. 1 rotated by 90 ° embodiment of the device comprises the optical housing 1, the optical element 5 and the adjustment drive 6 in the lateral Y-direction, which as a set screw or Justagerädchen 31st is designed with manually operated detent. Two covers 19, 20 above the optical element 5 cover the internal mechanisms of the device.

FIG. 6 shows the embodiment of the device according to FIG. 5 with the optical housing 1 with opened or removed covers 19, 20, with a housing 21 for the adjusting drive 2 for the Z-direction and with guides 3 for an adjustment of the optical element 5 in the Z direction, with the Versteilantrieb 6 for the adjustment of the optical element 5 in the Y direction, with a biasing spring 8 to eliminate a game from acting against the spring force Versteilantrieb 2 in the Z direction and with an optical socket 11 for the optical Element 5. The motor-trained adjustment drive 2 in the Z direction can be a spindle drive, a magnetic drive od. Like. be. The guides 3 are linear bearing guides with pins on which rolling bearings are moved back and forth.

In the view of FIG. 7 on the open optical housing 1, the housing 21 for the adjusting drive 2 in the Z direction, ie in the direction of beam propagation 14, the guides 3 formed in the Z direction from linear roller bearing guides and the biasing spring 8 respectively shown in view. The guides 4 for the lateral adjustment in the Y direction consist of the solid-state joints 10, 28 (FIG. B. allow in the arrangement as a parallelogram 22 for small strokes only one component of motion. The non-movable outer side 17 of the parallelogram 22 is fixedly connected to the optical housing 1. The movable inner side 18 is arranged so that a movement perpendicular to the direction of the beam propagation 14 is possible. The movable inner side 18 of the parallelogram 22 is fixedly connected to the linear adjustment drive 2 and the guides 3 for the adjustment of the optical element 5 in the Z direction, ie in the direction of beam propagation 14. Another linear Versteilantrieb 6 is located between the movable part, ie, the inner side 18 of the parallelogram 22, and the optical housing 1. The Versteilantriebe 2, 6 are biased by biasing springs 8, 9, wherein the biasing spring 8 in the Z direction and the biasing spring. 9 act in the Y direction. The optical mount 11 in FIG. 7 corresponds to the link 29 with permanently connected connecting rod 30 for the optical element 5 fixedly attached to it, as shown in FIG. 4.

LIST OF REFERENCE NUMBERS

optics housing

Adjustment drive in Z - direction

Guidance in Z direction

Guidance in Y direction

Optical element (focusing lens)

Adjustment drive in Y direction

(Alignment girl 31 with detent)

Adjustment screw for adjustment drive 6

Preloading spring in Z direction

Preloading spring in Y direction

Solid joint

optical means

Collimated beam

laser beam

beam propagation

Workpiece surface

laser focus

outside

inside

cover

Housing for adjusting drive 2

parallelogram

benchmark

Movement perpendicular to the direction of beam propagation benchmark

handlebars

Solid joint

handlebars

connecting rod

Justagerädchen

bearing rail

linear bearings

Intermediate segment (adjustable in Y-direction)

Claims

claims

1. Apparatus for material processing by means of a laser beam (13), with an optical element (5) arranged in an optical element (5) and with a guide (4) for a Y-direction laterally in the Z-direction beam propagation direction (14) movable linear adjustment drive (6),

characterized in that a second guide (3) is provided for a Z-direction in parallel to the Z-direction beam propagation (14) movable linear adjustment drive (2), so that an adjustment of the optical element (5) and thus of the laser beam (13) in two directions, d. H. in Y- and Z-direction, at the same time possible.

2. Apparatus according to claim 1, characterized in that for the adjustment of the laser focus (16) in the Z direction of the beam propagation (14) and for the adjustment of the laser focus (16) in the Y direction laterally to the direction of beam propagation (14). an optical element (5) and a respective linear adjusting drive (2, 6) are provided.

3. Apparatus according to claim 1 or 2, characterized in that for adjusting the optical element (5) in the Z direction, a motor linear adjusting drive (2) and for adjusting the optical element (5) in the Y direction and laterally to Z in Direction

Beam propagation (14) a manual or a motor linear adjusting drive (6) are provided.

4. Device according to one of claims 1 to 3, characterized in that a guide (4) for the adjustment of the optical element (5) in the Y-direction on the optical housing (1) is fixedly mounted and that in the

Guiding (4) guided Versteilantrieb (6) for the guide (3) of Versteilantriebes (2) for the Z-direction on the guide (3) for Versteilantrieb (2) of the optical element (5) in the Z-direction is mounted ,

5. Device according to one of claims 1 to 4, characterized

characterized in that for adjusting the optical

Elementes (5) is provided in a combination of Y and Z adjustment arrangement in the manner of a cross table.

6. Device according to one of claims 1 to 5, characterized

characterized in that for adjusting the optical

Element (5) in the Z direction by means of Ver¬ ^¬ drive (2) two parallel aligned and spaced from each other bearing rails (32) in linear bearings (33) are guided, which receive the optical element (5) between them.

7. Device according to one of claims 1 to 6, characterized

in that the optical element (5) is arranged in a collimated beam (12) and connected to

Forming a retrofocus system is formed from a lens ^¬ optics with positive refractive power.

8. Device according to one of claims 1 to 7, characterized

characterized that the connection of the module to the

Machining optics is designed as a detachable change interface.