WO2020114705A1

WO2020114705A1 - Method and machining device for cutting a profiled hollow-chamber workpiece

Info

Publication number: WO2020114705A1
Application number: PCT/EP2019/080502
Authority: WO
Inventors: Karsten Ruetz
Original assignee: Trumpf Werkzeugmaschinen Gmbh + Co. Kg
Priority date: 2018-12-06
Filing date: 2019-11-07
Publication date: 2020-06-11
Also published as: CN112912203A; DE102018131186A1; EP3890918A1; DE102018131186B4; CN112912203B

Abstract

The invention relates to a method for cutting a workpiece (30), in particular a profiled hollow-chamber workpiece, comprising a wall (52) and at least one workpiece inner section (54) lying within the wall (52), in particular a separating web, using a machining device (10). The machining device (10) has a laser machining device (12) and an additional separating device (14), in particular a mechanical separating device (14). The method has the following steps: a. separating the workpiece inner section (54) in a separating region (62) of the workpiece (30) using the separating device (14); and b. separating the wall (52) of the workpiece (30) in the separating region (62) using the laser machining device (12).

Description

Title: Method and processing device for cutting processing a

hollow-chamber-shaped workpiece

description

The invention relates to a method for cutting

Machining of a workpiece, in particular a hollow chamber profile. The invention further relates to a corresponding processing _V orrichtung.

From DE 10 2016 106 067 Al is one

Processing device for cutting processing of a tubular workpiece by means of a

Processing device known. The

Processing device a feed device for feeding of the workpiece to be cut. The feed device guides the tubular workpiece to be cut one

Laser processing device of the processing device for laser cutting. In the course of

Laser cutting process in particular gradually cut pipe parts from the tubular workpieces.

Cut pipe parts are over a

Unloading device added and from the

Laser processing device removed.

By means of the processing device known from DE 10 2016 106 067 A1, tubular workpieces can be cut into tubular parts. However, no workpieces can be cut that, in addition to a wall, also include internal workpiece sections, for example

Separators, have. This is because the geometries within the wall of a workpiece lack access to the laser cutting head

Laser processing device can not be cut, so that it is not possible to separate individual workpiece parts. In this respect, for example

Workpieces in the form of a hollow chamber profile cannot be cut into individual workpiece parts by means of the known processing device. Rather, the cutting is done

workpieces in the form of a hollow chamber profile, in particular by means of conventional chip removal with milling tools

comparatively low processing speed.

Especially for workpieces with complex

Machining contours lead to comparatively high manufacturing costs. The invention is therefore based on the object to remedy the disadvantages of the prior art mentioned.

This object is achieved by a method with the features of claim 1.

Accordingly, a method for cutting machining, in particular, is initially proposed

hollow chamber profile-shaped workpiece with a wall and at least one lying within the wall

Inner workpiece section, in particular a separator. The processing is done using a

Processing device, the processing device being a laser processing device and an additional separating device, in particular a mechanical one

Separating device has. The process includes the following steps:

a. Cutting the inner part of the workpiece in one

Cutting area of the workpiece by means of the cutting device; and

b. Cutting the wall of the workpiece in the cutting area using the laser processing device.

The workpiece to be machined can in particular

be rod-shaped and therefore have an elongated shape. Furthermore, the workpiece

in particular have a hollow chamber profile. The workpiece inner section can thus in particular be at least one Separator can be formed, the at least a first

Separates the chamber of the workpiece from a second chamber. In particular, the wall can be designed to run all the way round.

In particular, at least one workpiece part can be separated from the workpiece by means of the method. It is conceivable that a large number, in particular of the same type,

Workpiece parts from the workpiece by repeating steps a. and b. be separated.

The separation area is the area of the workpiece in which the steps a. and b. be carried out, in particular to separate a workpiece part from the workpiece.

In step a. can according to the invention by means of

Separating device for the one located inside the wall

Workpiece inner section of the workpiece are severed in the separation area. This inner workpiece section is in particular with the laser cutting head

Laser processing device is not accessible and can therefore not be cut by laser cutting.

According to the invention this area is by means of

Cutting device severed. There is thus the possibility of using workpiece parts

Laser processing device to cut the processing device by the of the

Parts of the laser processing facility accessible

Workpiece in the separation area, and not accessible parts of the workpiece are separated in the cutting area by means of the cutting device.

Compared to the state of the art, a speed increase and / or a

Cost reduction can be achieved by using the

Laser processing device severable sections of the workpiece during the cutting process by means of

Laser processing device are cut and the inaccessible parts are cut by means of the cutting device. There is consequently a combination of the laser cutting process with a further cutting process, carried out by means of the cutting device.

If there are a plurality of inner workpiece sections, for example two separating webs in a hollow chamber profile, in order to form a total of four hollow chambers, then all inner workpiece sections are in particular

Cutting area of the workpiece in step a. by means of

Cutting device severed.

In this context, it is conceivable that step b. before step a. is carried out. However

in particular, it is also conceivable that step a. before step b. is carried out. As a result, the inner part of the workpiece in the separating area is first cut in particular by means of the separating device. Then the further ones that can be cut by the laser processing device

Workpiece sections are severed in the separation area, in particular to cut off a workpiece part from the workpiece. In order to reach the inner part of the workpiece, it is conceivable, in particular in the case of peripheral walls, that a wall area in the

Separation area is cut until the

Workpiece inner section is reached and then the

Workpiece inner section is severed. Thereupon, a workpiece part can be completely removed by laser cutting

Workpiece to be separated.

It is conceivable that the separating device is designed as a mechanical separating device. The

Separating device have a radial milling tool, in particular with comparatively less

Feed rate and comparatively low

Cut the infeed depths of the inner workpiece section in the cutting area. It would be conceivable, for example, to use a counter-holder that absorbs any reaction forces on the workpiece. It would also be conceivable for the mechanical separating device to comprise a saw, for example a circular saw, a band saw and / or a jigsaw, in order to cut through the inner part of the workpiece in the separating area.

Finally, it would also be conceivable that the separating device is designed and configured to carry out a flame cutting process and / or a water jet cutting process in order to use the flame cutting process and / or the

Water jet cutting process to cut the inner part of the workpiece in the cutting area. However, it is particularly conceivable that the

Separating device comprises a plunge cutter in order to step a. to cut the inner part of the workpiece in the cutting area by means of a plunge milling process. This enables a comparatively low-power severing of the

Workpiece inner section are carried out. The

Plunge milling, for example, compared to radial milling, has the advantages of a low reaction force on the workpiece and a comparatively low one

Vibration excitation of the workpiece. Furthermore, plunge milling is particularly suitable with low workpiece stability and / or with long tool overhangs due to the comparatively low machining forces that occur. For example, it is conceivable for the workpiece to be fed to the laser processing device and the mechanical separating device by means of a slide-through chuck with a comparatively low clamping force, so that, for example, milling away the inner part of the workpiece by means of a radial milling movement is comparatively expensive and difficult to accomplish.

It is also advantageous if the separating device is a

Includes machining spindle on which the plunge milling cutter

is arranged, the machining spindle in step a. is operated at a speed of at least 4000 rpm, in particular at least 6000 rpm. Such a processing speed in particular enables a comparatively economical cutting of the

Workpiece inner section in the separation area in step a. It is particularly preferred if the plunge cutter in step a. is operated with a feed rate of at least 0.5 m / min, in particular at least 1.2 m / min. Such one

In particular, feed can enable a sufficiently high and therefore economical processing speed.

It is also particularly preferred if the plunge milling cutter in step a. is operated at a peripheral speed of at least 100 m / min. Such a high one too

Peripheral speed can become an economic one

Operation of the process contribute.

It is also particularly preferred if the

Machining device has a chuck with at least one clamping jaw for clamping and moving the workpiece, the clamping force of the clamping jaw being a maximum of 2.5 kN, in particular a maximum of 2.0 kN. Despite this comparatively low clamping force, a plunge milling process can be carried out in particular. Plunge milling enables in particular low-power machining of the workpiece. This is particularly due to the comparatively low reaction force on the workpiece and one

comparatively low vibration excitation of the

Workpiece.

Furthermore, the processing device can

Have push-through chucks with at least one clamping jaw for guiding the workpiece, the clamping force of the clamping jaw being a maximum of 2.5 kN, in particular a maximum of 2.0 kN. Despite the comparatively small Clamping power is particularly possible by means of a plunge milling process.

The workpiece advantageously consists of aluminum or comprises aluminum. Consequently, in particular

Hollow chamber profiles made of aluminum using the process particularly economically into individual workpiece parts

be severed.

However, it is also conceivable that the workpieces to be machined in accordance with the method consist of other common materials or comprise other common materials. In addition to aluminum, such common materials can also be structural steel, stainless steel, copper and / or brass. Additionally or alternatively, common materials of this type can also be used

Plastics, rubber materials, wood and / or

Composite materials.

The object set is also achieved by a processing device for performing the

inventive method, the

Processing device has a laser processing device and an additional separation device, in particular a mechanical separation device. The

Processing device consequently on the one hand

Possibility of laser cutting using the

Laser processing device on. Due to the provision of the additional separating device, however, workpiece sections of a workpiece can also be cut, which are not by means of the laser processing device can be cut, in particular due to inaccessibility by means of a laser cutting head

Laser processing device. In this respect, with the

Processing device due to the combined

Providing a laser processing device and a further cutting device in particular in particular

Hollow chamber profiles can be separated into individual pieces.

The separating device preferably comprises one

Plunge cutters. Such a plunge cutter enables

in particular the cutting of internal geometries of workpieces that cannot be cut by means of the laser processing device. Plunge milling can be used to separate internal workpiece sections

comparatively low occurring reaction forces on the workpiece and comparatively less

Vibrations are excited on the workpiece. Internal geometries can also be severed when the clamping force in a chuck

Processing device are comparatively small and are, for example, at a maximum of about 2 kN per chuck of the chuck.

A particularly preferred development of the invention provides that the separating device comprises a machining spindle on which the plunge milling cutter can be arranged or

is arranged. By means of such a separating device, one is comparatively quick and inexpensive

Cutting internal geometries from to cutting workpieces, especially hollow chamber profiles, possible.

Further details and advantageous embodiments of the invention can be found in the following description, on the basis of which the one shown in the figures

Embodiment of the invention is described and explained in more detail.

Show it:

Figure 1 is a schematic perspective view of a

Processing device with laser processing device and a separating device according to an embodiment;

FIG. 2 shows a schematic perspective illustration of a workpiece to be machined by means of the machining device according to FIG. 1;

Figure 3 (a) representation according to Figure 2 with a schematic

Representation of a separation process using the

Separating device according to Figure 1, and (b) schematic plan view of the representation according to Figure 3a;

Figure 4 representation based on Figure 3a with

schematic representation of a separation process by means of the laser processing device according to Figure 1; and 5 shows a perspective view of a part of the workpiece of the workpiece shown in FIG. 2, separated by means of the separating processes shown in FIGS. 3 and 4.

Figure 1 shows schematically simplified a processing device generally designated by the reference numeral 10. This includes a laser processing device 12. Furthermore, this includes an additional cutting device 14.

The laser processing device 12 comprises one

Laser beam source 15 for generating a laser beam 16, a laser cutting head 18, and a beam guide 20 which the laser beam 16 from the laser beam source 15 to

Laser cutting head 18 leads.

The separator 14 is next to or below the

Laser cutting head 18 arranged. This comprises a shaft, shown in FIG. 3, which is rotatable about an axis of rotation 22

Spindle 24. A plunge cutter 26 is detachably arranged on the spindle 24.

The processing device 10 further includes a

Feeding device 28 for the lateral feeding of a workpiece 30 to be cut by the machining device 10. The process of separating a workpiece part from the

Workpiece 30 will be described in detail later. The feed device 28 comprises one

Loading device 32 for storing workpieces 30 before they are cut. The feed device 28 further comprises a holding device 34 for holding and Displacement of the workpiece 30. The holding device 34 is driven by a motor and can be displaced back and forth in a feed direction (X direction) 36. The

Feed device 28 further comprises a machine bed 38 with guide rails 40 on which the holding device 34 is arranged such that it can be displaced. The holding device 34 also has a chuck 42 with four clamping jaws 44. The chuck 42 serves to hold the workpiece 30. The workpieces 30 are each clamped with a clamping force up to a maximum of approximately 2 to 2.5 kN per clamping jaw 44. The chuck 42 is rotatable, as indicated by the double arrow 46, in order to rotate a clamped workpiece 30. The feed device 28 further comprises a workpiece support 48 arranged on the machine bed 38 for supporting the workpiece 30. Finally, the feed device comprises

Feed device 28 a push-through chuck 50, through which the workpiece 30 is fed to the laser processing device 12 or the separating device 14. The

Push-through chuck 50 likewise has clamping jaws, the workpiece 30 being carried through being clamped with a clamping force of up to a maximum of approximately 2 to 2.5 kN per clamping jaw.

The processing device 10 further includes a

Unloading device 51 for removing a cut workpiece.

In addition to the separating device 14, a tool magazine 53 is provided. This magazine 53 can, for example, as

Be linear or revolver magazine. In this Magazine 53 can use various tools, such as

For example, drills, flow drills, thread cutting tools or thread forming tools can be arranged. Consequently, instead of a plunge milling cutter 26, for example, another tool can also be arranged on the spindle 24, for example in order to cut a thread in one

To provide tool part.

Overall, the processing device 10 is designed to carry out the following method:

The workpiece 30 is designed as a hollow chamber profile and is shown schematically in perspective in FIG. The workpiece 30 can be designed in particular as an aluminum hollow chamber profile. Hence, that points

Workpiece 30 in particular a rectangular or

square outer contour. The workpiece 30 comprises a peripheral wall 52. Inside the wall is a

Workpiece inner section 54 is arranged, which is designed as a separating web and consequently the workpiece 30 in two

Hollow chambers 56, 58 divided.

In order to separate a workpiece part 60 (shown as an individual part in FIG. 5) from the workpiece 30, the workpiece 30 is displaced in such a way that a separation area 62 (see FIG. 3) of the workpiece 30 from the processing device 14

is editable. The separation area 62 is consequently the area of the workpiece 30 at which the workpiece part 60 is to be separated from the remaining workpiece 30. Then a plunge cutter 26 is used first

Wall section 64 in the separation area 62 of the wall 52

pierced until the separating web 54 is reached. Then, as can be seen particularly clearly in FIG. 3b, the

Separator 54 is severed in the separation area 62. This continues until the inside of the opposite wall 52 is reached (cf. FIG. 3b). Overall, the

Plunge milling process consequently introduced a circular cylindrical bore into the workpiece 30 with comparatively little force. The plunge milling process can be carried out with a plunge cutter with a diameter of 6 mm at a speed of 6000 revolutions per minute, which is one

Circumferential speed of 113 per minute corresponds. The feed can be, for example, 1.2 m / min.

Then, as shown in Figure 4, by means of

Laser processing device 12 a laser cut 66 along the circumference 65 of the workpiece 30 in the separation area 62

performed to separate the workpiece part 60 from the workpiece 30. In the course of this laser cut 66, the

Wall 52 in the separation area 62 is cut over the entire circumference 65.

Overall, the workpiece part 60 is consequently separated by a combination of a plunge milling process and a laser cutting process.

By means of the plunge milling process, the separating web 54 located in the interior of the wall 52 is first

Separation area 62 severed. This interior area of the hollow chamber-shaped workpiece 30 is with

Laser radiation due to lack of accessibility using the

Laser cutting head 18 cannot be severed. The entire remaining part of the workpiece 30 that can be cut by the laser radiation 18 is then cut in a particularly efficient and rapid manner by laser cutting. Overall, processing of hollow-chamber profile-like workpieces can thus be made possible by means of a laser processing device 12, by the process of the

Laser processing device 12 not severable

Areas are separated if necessary by the plunge milling process by means of the separating device 14.

As a result, efficient processing,

in particular cutting off workpiece parts 60 from

hollow chamber profile-like workpieces 30 are carried out.

Claims

1. Process for cutting a

in particular a hollow chamber profile-shaped workpiece (30) with a wall (52) and at least one inner workpiece section (54) lying within the wall (52), in particular a separating web, by means of a processing device (10), the

Processing device (10) a

Laser processing device (12) and an additional separating device (14), in particular a mechanical separating device (14), the method

comprising the following steps: a. Severing the inner workpiece section (54) in a separating area (62) of the workpiece (30) by means of the separating device (14); and b. Cutting through the wall (52) of the workpiece (30) in the separation area (62) by means of the

Laser processing device (12).

2. The method of claim 1, wherein step a. in front

Step b. is carried out.

3. The method according to claim 1 or 2, wherein the

Separating device (14) comprises a plunge milling cutter (26) in order to step a. to cut through the workpiece inner section (54) in the separating area (62) by means of a plunge milling process.

4. The method according to claim 2 or 3, wherein the separating device (14) comprises a machining spindle (24) on which the plunge milling cutter (26) is arranged, the machining spindle (24) in step a. is operated at a speed of at least 4000 rpm, in particular at least 6000 rpm.

5. The method according to claim 3 or 4, wherein the

Plunge milling cutter (26) in step a. is operated with a feed rate of at least 0.5 m / min, in particular at least 1.2 m / min.

6. The method according to claim 3 or 4 or 5, wherein the plunge milling cutter (26) in step a. with a

Peripheral speed of at least 100 m / min is operated.

7. The method according to any one of the preceding claims, wherein the machining device (10) has a chuck (42) with at least one clamping jaw (44) for clamping and moving the workpiece (30), the clamping force of the clamping jaw (44) being a maximum of 2.5 kN, in particular a maximum of 2.0 kN.

8. The method according to any one of the preceding claims, wherein the processing device (10)

Push-through chuck (50) with at least one

Has clamping jaw for guiding the workpiece (30), the clamping force of the clamping jaw being a maximum of 2.5 kN, in particular a maximum of 2.0 kN.

9. The method according to any one of the preceding claims, wherein the workpiece (30) consists of aluminum or comprises aluminum.

10. The method according to any one of claims 1 to 8, wherein the workpiece (30) made of structural steel, stainless steel, copper,

Brass, plastic, rubber material, wood and / or composite material, or one of the aforementioned materials.

11. Processing device (10) for performing the

Method according to one of the preceding claims, wherein the processing device (10)

Laser processing device (12) and an additional separation device (14), in particular a mechanical separation device.

12. Processing device (10) according to claim 11, wherein the separating device (14) comprises a plunge milling cutter (26).

13. Machining device (10) according to claim 12, wherein the separating device (14) comprises a machining spindle (24) on which the plunge milling cutter (26) can be arranged or arranged.