WO2011098067A1

WO2011098067A1 - Water-jet cutting machine

Info

Publication number: WO2011098067A1
Application number: PCT/DE2011/000109
Authority: WO
Inventors: Tilo Klett
Original assignee: Tilo Klett
Priority date: 2010-02-15
Filing date: 2011-02-07
Publication date: 2011-08-18
Also published as: DE112011100539A5; DE202010002246U1

Abstract

The invention relates to a water-jet cutting machine, which has a carriage (2) that can be moved in the X direction, said carriage having a cantilever (4) that is movably mounted in the Z direction. The cutting head (5) is mounted on the cantilever (4) such that the cutting head can be moved in the Y direction by means of a moving device. The cantilever (4) is rotatably attached to the carriage (2) such that the cantilever can perform a B rotation and that the spatial coordinates of the pivot point of the cantilever (4) in the X direction and in the Z direction are identical to the spatial coordinates of the processing point on the workpiece in the X direction and in the Z direction. The design according to the invention enables the entire cantilever (4), together with the cutting head (5), to rotate about the processing point on the workpiece in the event of a necessary correction of the cutting angle and the stream lag in the X direction. Therefore, an adjusting device for correcting the stream lag in the X direction on the cutting head (5) itself can be omitted.

Description

Water jet cutter

The invention relates to a water jet cutting machine with Schnittschrägen- and Strahlnachlaufkompensation.

Waterjet cutting machines for processing various materials are known in the art.

Such a water jet cutting machine is described for example in utility model DE 202 06 427 Ul.

This electronically controllable precision water jet cutting machine includes a carriage which can be moved in the X direction and has a boom which can be moved in the Y direction and has a cutting head, the cutting head itself being movable in the Z direction.

Such Wasserstrahlschneidvorichtungen usually have a permanently mounted, rotatably immovable, cutting head.

The known from the prior art water jet cutting machines have the disadvantage that in the separation of the workpiece by a water jet, a chamfer error occurs, whereby the cutting edge does not behave perpendicular to the workpiece surface. The generated cutting gap is often narrower on the inlet side than on the outlet side.

Furthermore, a so-called jet lag occurs. The water jet is deflected when separating the workpiece, depending on its thickness, in the workpiece against the direction of advance.

Both phenomena increase with increasing processing speed.

Especially with precision parts, these phenomena are undesirable and it is a post-processing necessary to obtain standing perpendicular to the surface cut surfaces.

CONFIRMATION COPY In order to prevent the chamfer error, the cutting head must be inclined by the amount of the chamfer angle.

In order to further correct the beam tracking error, the cutting head must be introduced obliquely by the amount of the beam tracking angle in the direction of advance.

Both corrections ideally occur simultaneously and are also called chamfer and beam lag compensation.

Especially with regard to the use of new pump generations, which are able to generate a continuously high system pressure and thus allow a corresponding increase in the cutting speed and the workpiece pass, this Schnittschrägen- and Strahlnachlaufkompensation is particularly important.

One way to effect the Schnittschrägenkompensation described patent specification DE 100 17 039 B4.

This includes a cutting head guide for tilting the cutting head which is characterized in that the cutting head is clamped in a movable socket, which is supported by a plurality of truncated pyramidal struts.

These struts are attached by means of bending joints on the base plate and on the, leading the cutting head, socket. By applying control forces to the socket, it is tilted by the struts so that the cutting head can be tilted by small angles of up to 6 °.

The outlet opening of the cutting nozzle remains on the cutting beam axis corresponding to the rest position of the cutting head. A system which can simultaneously perform both a Schnittschrägenais and a Strahlnachlaufkompensation is described in patent US Pat. No. 6,766,216 B2.

It describes a 5-axis cutting system in which the cutting head is computer-controlled, in addition to its traversability in the X, Y and Z directions, rotatably mounted.

Furthermore, according to the state of the art, solutions are known in which the cutting head is fastened via a manipulator to the machine arm which can be moved in the X, Y and Z directions. By means of this manipulator, the cutting head can be rotated in any direction and thus the Schnittschrägenfehler and the jet lag can be compensated.

The cutting head is moved by the manipulator during necessary pivoting movements about the processing point, ie the point at which the cutting beam hits the workpiece. This solution requires a complex control of the processes during the cutting process and an increase in the masses to be moved on the machine arm.

A disadvantage of all solutions according to the prior art is, inter alia, that the costs associated with this device masses are positioned on the machine arm, lead to accelerations to increased dynamic force inputs and therefore require a more complex design of the machine arm.

The object of the invention is to provide a water jet cutting machine, with the simplest possible, robust and cost-effective compensation of the Schnittschrägenfehlers and the Strahlnachlaufs can be achieved and in which the moving masses on the boom of the device are minimized. The object is solved by the features listed in claim 1. Preferred developments emerge from the subclaims.

The longitudinal, transverse and vertical axes are described by the terms X-, Y- and Z-axis, wherein the X-axis extending any axis along the workpiece carrier, the Y-axis extending any axis transverse to the workpiece carrier and the Z-axis represents any axis running in the vertical direction.

Rotation around any X-axis is called A-rotation, rotation about any Y-axis is called B-rotation. The rotation may also be referred to as pivoting.

A water jet cutting machine according to the invention has a carriage which can be moved in the X direction and has a boom mounted thereon, which is arranged in the Y direction.

On the boom a movable in the Y direction displacement device is mounted, which carries the cutting head.

The boom is rotatably mounted on the carriage in such a way that the boom can perform a B-pivoting.

The spatial coordinates of the fulcrum of the boom are identical in the X and Z directions to those of the machining point on the workpiece. The machining point is the point at which the water jet impinges on the workpiece surface.

Due to the construction according to the invention is achieved that in a necessary correction of chamfer or

Beam trailing is the X component of the Korrekturverschwenkung caused by rotation of the entire boom with cutting head to the machining point on the workpiece. As a result of the construction according to the invention, it is achieved that no adjusting device for correcting the cutting head in the X direction has to be provided on the delivery arm.

Furthermore, there is no change in the distance between the beam exit opening on the cutting head and the machining point on the workpiece during a correction of the cutting head caused by the correction, so that subsequent corrections for this in the Z direction are not necessary.

Due to the omission of otherwise necessary adjusting devices on the boom for the corrections to the boom to be moved masses and the acceleration forces caused by it are reduced. The boom is thus less loaded and must be carried out in terms of rigidity and vibration behavior less expensive.

The remote to the processing point positioning of the boom rotation mechanism in the carriage also has the consequence that the rotating mechanism is less loaded by the, resulting from the cutting impurities.

According to the invention, the boom can also be designed as a bridge being formed ^¬ which carries the cutting head and is movable and rotatably mounted on the respective opposite sides of the to bear ^¬ beitenden workpiece on a respective carriage.

In a preferred refinement, the cutting head is rotatably mounted on the traversing device in such a way that it can execute an "A" pivoting.

This causes the Y component of the correction tilt for the bevel and jet lag correction. According to the invention, the rotatable mounting is designed so that even with the A-rotation of the pivot point is in the processing ^¬ point.

Due to the described simultaneous rotation about the X- and Y-axis, the chamfer error and the beam tracking error arising with each movement of the cutting head can be corrected.

The execution of the A and B pivoting according to the invention results in that, in the case of necessary corrections of chamfer and jet trailing, no translatory readjustment movements in the X, Y and Z directions have to take place.

Furthermore, with a device according to the invention water jet cutting operations can be realized, in which the

Cutting edge in definable and changeable during the cutting process angles to the workpiece surface is held in contours.

The movability of the carriage is preferably realized by ei ^¬ NEN linear motor which with respect to the conven tional ^¬ mechanical drive provides advantages.

Thus, for example, the slide can be positioned more accurately, since in such a drive eliminates the so-called backlash. Thus, tighter tolerances can be achieved with respect to parallelism and squareness.

Furthermore, the mechanical wear caused by conventional pinions, gear racks and gear ratios can be reduced.

The B-rotation of the boom, relative to the carriage, preferably takes place via a torque motor. A preferred embodiment of the invention provides that the boom, relative to the carriage, can be moved vertically in the Z direction.

This makes it possible in particular to make the setting of the required distance Zvi ^¬ rule cutting head and the workpiece prior to the cutting process. Since the adjustment ^device moves the entire boom in the Z direction and is arranged in the region of the carriage, the masses of such an adjusting device otherwise otherwise located on the boom itself are omitted. As a result, a further mass reduction on the boom can be achieved with the already described advantages of a mass reduction.

In a preferred embodiment the distance between the cutting head and the workpiece during the cutting operation by a Verfahrung in Z-direction can be corrected et ^¬ waige irregularities in the thickness of the workpiece or the tool süückauflage compensate on the workpiece holder or to process workpieces having irregular surfaces.

The invention will be described as an embodiment of hand

Fig. 1 explained in more detail perspective view.

The device is shown in Fig. 1 in a schematic view.

On the machine frame 1, the carriage 2 is arranged. The carriage is mounted in such a way that it can be moved along the X-axis along the workpiece carrier 3 by means of a linear drive. On the carriage 2, the boom 4 is mounted, which extends transversely to the machine frame on the workpiece carrier 3.

The boom 4 is mounted by means of torque motor relative to the carriage 2, rotatable about the Y-axis, on this.

The axis of rotation of the boom 4 is any axis in the Y direction, which runs parallel to the boom through its pivot point and the machining point on the workpiece.

As a result, the spatial coordinates in the X direction and in the Z direction of the pivot point of the boom 4 are identical to the spatial coordinates in the X direction and in the Z direction of the machining point on the workpiece.

This structure causes that when a B pivoting of the cutting head 5 becomes necessary, the entire boom 4 with the cutting head 5 is rotatable about the Y-axis.

In order to generate the required for the cutting process distance between the cutting head 5 and workpiece carrier 3, the boom 4 is also vertically by means of adjusting vertically, so in the Z direction, movably mounted on the carriage 2. This allows an exact adjustment of the distance from the cutting head and machining point, since both workpieces of different thicknesses are on the workpiece carrier 3, as well as irregularities in the thickness of one and the same workpiece can occur. Since, according to the invention, the adjusting devices are arranged both for the B pivoting and for the movement in the Z direction in the region of the connection between the carriage and the arm, the masses required for this purpose are omitted in the cutting head region of the arm. The required acceleration energy is reduced or it is faster movement state changes possible. In order to ensure the required distance between the cutting head 5 and the workpiece carrier 3 for the entire machining operation, a first orientation run of the cutting head 5 is meaningful before the beginning of the cutting process.

In this case, the cutting head 5 is performed at least once over the entire ge ^¬ workpiece to be machined and means of distance of the distance between the cutting head 5 and the workpiece measuring device empirically determined at various points and the data stored.

During the later cutting process, this distance between the cutting head 5 and the workpiece can then be correspondingly corrected automatically on the basis of the stored data.

A complex, permanent monitoring of the distance between the cutting head 5 and workpiece during the machining process is therefore not necessary.

The cutting head 5 is mounted by means of traversing device (without reference numeral) movable in the Y direction on the boom 4.

The cutting head 5 can by means of adjusting device, which is designed as a circular segment guide whose center is located in the processing point (not shown), perform an A-pivoting.

In a correction become necessary rotational movement of the cutting head 5, the X component of the Schnittschrä ^¬ gene or beam tracking error by the A-rotation of the

Cutting head 5 itself and the Y-component of ^{Schnittschrä ¬} gen- or steel tracking error achieved by the B-rotation of the entire, the cutting head 5 leading arm 4. Used reference signs

1 machine frame

2 sleds

3 workpiece carrier

4 outriggers

5 cutting head

Claims

claims

A water jet cutting machine comprising a carriage (2) mounted on a machine frame (1) in the X direction, a boom (4) disposed on the carriage (2) and one on the boom (4) in the Y direction movable cutting head (5),

characterized,

in that the boom (4) is rotatably mounted on the carriage (5) so as to be pivotable relative to the carriage (5), whereby the cutting head (5) follows its pivoting in B-rotation due to its positional relationship with the boom (4); Rotation about the machining point on the workpiece (3).

2. Apparatus according to claim 1,

characterized,

in that the cutting head (5) is rotatably arranged relative to the boom (4) in A-rotation so as to be rotatable thereon, wherein the A-rotation takes place about the machining point on the workpiece.

3. Device according to one of the preceding claims, characterized

the boom (4) can be moved in the Z direction relative to the carriage (2).

4. Device according to one of the preceding claims, characterized

the movability of the carriage (2) in the X direction is effected by a linear motor. Device according to one of the preceding claims, characterized

that the B-rotation of the boom (4) takes place by means of a torque motor.

Device according to one of the preceding claims, characterized

that the movement of the cutting head (5) on the boom (4) in the Y direction by a linear motor.

Apparatus according to claims 3 to 6,

characterized,

that the adjustment of the boom (4) in the Z direction by a spindle drive.