EP2675600A2

EP2675600A2 - Water-jet cutting machine and water-jet cutting method for working tubular workpieces

Info

Publication number: EP2675600A2
Application number: EP12732768.2A
Authority: EP
Inventors: Tilo Klett
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-15
Filing date: 2012-02-15
Publication date: 2013-12-25
Also published as: DE202011002773U1; WO2012110022A2; DE112012000822A5; DE102012002814A1; WO2012110022A3

Abstract

The present invention relates to a water-jet cutting machine for working tubular workpieces, having at least one carriage which can be moved in an X direction and has an extension arm arranged on it, and also having a cutting head holder arranged movably in the Y direction on the extension arm and intended for receiving a cutting head. The water-jet cutting machine is also assigned supporting elements for receiving the workpiece, and at least one driver, wherein the driver is in engagement with the workpiece and brings about a rolling movement of the workpiece on the supporting elements. The present invention also relates to a water-jet cutting method for working tubular workpieces, wherein a rolling movement of the tubular workpiece that is synchronous with the X or Y movement of the cutting head is brought about on the supporting elements by the engagement of the drivers.

Description

Water jet cutting machine and water jet cutting method for machining tubular workpieces

The invention relates to a water jet cutting machine for machining tubular workpieces, hereinafter also referred to as workpieces or pipes, in particular for cutting penetrations.

Water jet cutting machines are known from the prior art.

These usually have a workpiece carrier for positioning the workpiece to be machined and a movable in X-, Y- and often also in the Z direction cutting head. By the cutting head a suitably trained cutting jet is released, with or without added abrasive, which penetrates the workpiece and thus cuts it.

The cutting head is usually connected via a boom or a portal with a movable carriage.

The movement in the X direction is effected by a longitudinal movement of the carriage, the movement in the Y direction is performed by a method of the cutting head on the boom and the movement in the Z direction is done by a vertical longitudinal movement of the boom relative to the carriage.

It is also known from the prior art that the cutting head is capable of performing chamfer and trailing compensation by suitable mechanisms. In conventional water jet cutting machines, the workpiece to be machined is usually clamped on suitable clamping devices firmly on the workpiece carrier.

However, such a firm clamping of the workpiece is only partially suitable for processing tubular workpieces. Since in the machining of pipes, in most cases a radial placement of the cutting jet on the lateral surface is desired in order to obtain a radial cutting edge, the cutting head would have to carry out a correspondingly complex and difficult to realize movement sequence with a firmly clamped pipe.

In order to avoid such a complicated movement of the cutting head in a machining of pipes, devices are known from the prior art, which put the respective pipe to be machined during the cutting operation in a rotation about its longitudinal axis. The longitudinal axis of the tube in this case represents an arbitrary axis, parallel to the Y-axis of the device.

Due to the fact that in this case the propulsion movement is generated in the X direction during the cutting process by the rotation of the lateral surface of the tube about its longitudinal axis, it is possible to lock the cutting head along the X-axis of the device in the position in which this always radially meets the lateral surface of the tube and thus generates an always radial cutting edge.

These are clamping devices, hereinafter also referred to as rotation means. These cause additional costs. Furthermore, a separate control of the rotational movement must be provided and the rotation means be matched in particular to the length of the tubular workpieces. A further disadvantage is that with long tubular workpieces, another receptacle has to be provided at the end opposite the clamping device. It is also particularly disadvantageous that machining in the section of the tubular workpiece which is in engagement with the clamping device is not possible. In the machining of tubular workpieces, in particular when cutting one-sided penetrations by means of water jet cutting, however, the problem arises regularly that the cutting jet after penetrating the desired wall of the tube, the energy given to it has degraded only a part and therefore in a position to damage the tubular element at the side opposite the intersection to be cut, or in some circumstances to unintentionally sever it.

In order to prevent this effectively, for example, DE 197 11 512 C1 provides, at least in part, for filling the tubular element with a core.

The core to be introduced into the tubular element is designed such that the cutting beam either partially penetrates into the core or is correspondingly reflected and broken by the core.

In either case, the energy of the cutting jet through the core is reduced to such an extent that it becomes harmless to non-cutting areas of the pipe.

As materials for such a core, for example, plastic, metal or stone, as a solid material or in the form of bulk material, are used. Such introduction of a core into the pipe to be cut, however, disadvantageously requires a complex adjustment of the core in terms of its material and its configuration, depending on the diameter of the tube, the wall ^¬ strength and the resulting necessary energy of the cutting jet.

Likewise, the tubular workpiece can also be damaged by the filling egg ^¬ nes granules on the inside ^¬ the.

To the introduction of a one-sided penetration into a tubular member by means of cutting jet cutting to ermögli ^¬ surfaces even without the use of a separately introduced core also includes devices for the prior art in which the pipe to be machined about its longitudinal axis in rotation at least partially immersed within a water ^¬ is arranged. The degradation of the cutting beam energy takes place in such a way that it is due to friction, refraction or the like of the cutting jet in the pipe interior ^¬ pending water is reduced.

However, such a device is also disadvantageous in several respects.

First, the rotation of the tubular element takes place within the water basin. Thus, the use of the means necessary for the rotation, also described as rotation means, necessarily has to take place in an environment contaminated by particles separated out from the workpiece and, where appropriate, abrasives. This can lead to the penetration of dirt particles in the rotation means, whereby they pollute and fail under certain circumstances. On the other hand, it can not be ruled out that due to the contact of the rotation means to the water and thus also to the workpiece, particles, or chemical elements reach the workpiece, which undergo an unwanted reaction or connection with the workpiece material.

The object of the invention is therefore, while avoiding the disadvantages of the prior art, to provide a water jet cutting machine for machining rohrformiger workpieces, which prevents unwanted damage to the tubular workpiece and thereby manages without complex rotation means and fixtures.

The object is achieved with respect to the water jet cutting machine by the features listed in claim 1 and with respect to the method by the features listed in claim 16. Preferred developments emerge from the subclaims.

A water jet cutting machine according to the invention for machining rohrformiger workpieces has at least one movable carriage in the X direction with an arranged on this boom.

The boom is further associated with a movable in the Y direction cutting head holder for receiving a cutting head.

The invention encompasses both the arrangement of a single carriage with a boom arranged on it, and the arrangement of two, opposing and synchronously moving carriage. In the second case, the boom is designed as a bridge between the two carriages. The invention is characterized in that the water ^¬ jet cutting machine support elements for receiving the workpiece ^¬ piece, and at least one driver are assigned, wherein the driver is engaged with the workpiece and causes a rolling movement of the workpiece on the support elements.

The workpiece to be machined itself is not part of the device.

The support elements are preferably made of stainless steel, thereby making it on one hand effectively prevents the Aufla ^¬ geelemente corroded by the water used and at the other hand, ^¬ any wear caused by the high Wi ^¬ derstandsfähigkeit of stainless steel can be reduced.

The driver of a device according to the invention is preferably designed so that the distance between the opposing and engaged with the workpiece contact surfaces as closely as possible corresponds to the outer diameter of the workpiece, so that on the one hand the respective position of the workpiece is determined by the driver play and on the other hand the contact between the driver and workpiece to reduce the frictional forces takes place free of contact forces.

In this case, the positional relationship of the driver to the cutting head in dependence on the respective diameter of the workpiece is preferably set so that the cutting head is exactly above a point of the apex line of the tubular workpiece.

Preferably, the shape of the driver is designed so that between the driver and workpiece a point or line enförmige contact surface is formed. A full-surface concern of the driver on the workpiece and a resulting possibly increased friction between the driver and the workpiece are thus particularly advantageously avoided; There is no relevant influence on the rolling process due to the friction between the driver and the workpiece.

Likewise, it is avoided by the inventive design of the driver that fall during the cutting process material residues or residues of any use found abrasive in the contact area between the driver and workpiece.

According to the invention, the driver can be adapted to different workpiece diameters by means of correspondingly shaped inserts.

As a result, an uncomplicated and cost-effective processing of different workpiece diameters is achieved in a particularly advantageous manner.

Compared with the devices known from the prior art, a water jet cutting machine according to the invention is particularly advantageous in that no separate means for causing a rotational movement of the workpiece are required. The already performed linear movements of carriages with boom and cutting head holder would be transformed by the driver in a rotational movement of the workpiece. The time-consuming means for providing the rotational movement required by the prior art can be dispensed with.

Thus, both manufacturing and maintenance costs compared to the known devices can be reduced. Likewise, eliminates as a further advantage in a device according to the invention necessary when using conventional rotation means conversion of the angular ^¬ speed of the tube in the measure of the cutting speed specifiable speed of the tube circumference, since the speed of the rolling movement of the tube and thus the movement of the lateral surface below the cutting head according to the invention always coincides with the respective speed of movement of the cutting head in the axis of the rolling motion.

As a result of the absence of the conventional means of rotation according to the invention, the otherwise necessary lateral clamping of the workpieces at their ends is dispensed with in a water jet cutting machine according to the invention.

Thus, it is compared to the prior art particularly advantageous allows the entire tube, including the pipes to edit without a complex re-clamping.

Since the workpieces to be processed according to the invention must be placed only on the provided support elements eliminates the further advantage of the otherwise necessary clamping process before the actual processing of the workpieces.

Thus, in the use of a device of the type mentioned reduce the time required for machining the workpieces and thereby the overall cost of the cutting process.

Due to the fact that a pipe for its processing on a device according to the invention does not have to be clamped at its end, it is just as advantageous possible to process even long pipes in full. The maximum possible processing length thus depends only on the maximum reach of the cutting head.

It has likewise proven to be advantageous that a generic water jet cutting machine can be adapted more easily to different pipe diameters than is the case with the devices known from the prior art.

A preferred variant of the invention provides that the driver is arranged on the carriage of the water jet cutting machine such that it executes a, in the movement of the carriage, synchronous movement in the X direction.

Such an arrangement of the driver causes a rolling movement of the tubular workpieces parallel to the movement of the carriage in the X direction.

The rolling movement of the tubular workpiece represents in the ^¬ sem case during the machining process, the advancing movement of the cutting beam in the X direction.

During the machining process, the tube is positioned by the driver so that the cutting jet impinges radially on the tube. As a result, it is achieved with particular advantage that the cutting edge produced by the cutting jet always extends radially to the lateral surface of the tube.

In an alternative preferred variant of the invention, the driver is assigned to the cutting head holder.

Such an assignment of the driver to the cutting head causes the rolling movement of the tubular workpiece parallel to the movement of the cutting head holder in the Y direction. Thus, the rolling motion of the tube during the machining operation represents the propelling movement of the cutting beam in the Y direction.

Here too, the cutting head with respect to the tubular work piece is positioned by the carrier according to the invention that this applies radially on the lateral surface of the tube and thereby a radially extending cutting edge he ^¬ testifies.

A further preferred variant of the invention provides that a plurality of drivers are arranged side by side either on the carriage or on the cutting head holder.

By providing a plurality of entrainment is particularly advantageous the exact parallelism of the rolling movement of the tube either in the case of claim 2 for moving the carriage in the X direction or in the case of claim 3 for moving the cutting head holder secured in the Y direction, since this rotation of the Pipe around the vertical axis during the rolling movement is effectively prevented.

In an equally preferred development, a water jet cutting machine according to the invention has a collecting device for catching and weakening the cutting jet.

The collecting device is used according to the invention, the

To catch cutting beam and this deprive of its energy to effectively prevent uncontrolled damage, such as non-machinable areas of the tube. Such a collecting device is designed for example as a, the cutting head opposite, water basin.

In such a case, the device according to the device arrangement of the pipe to be machined takes place such that it is completely or at least partially below the water level.

In any case, the arrangement of the tube takes place in the water basin so that the cutting beam is caught and attenuated by penetrating the lateral surface of the pipe at the designated location, by the corresponding volume of water so far that an unintentional damage to the pipe on the opposite shell side or about further, arranged within the water basin and not directly related to the cutting process elements is prevented.

As a further particular advantage, the support elements arranged within a water basin provided according to the invention are protected by their covering with water, in particular against external influences.

A collecting device according to the invention can also be designed as a core to be inserted into the tube from a suitable material.

The selection of the respective material which is suitable for the core takes place on the basis of the energy required for the machining process and the resistance of the material required for nearly complete attenuation of the cutting beam energy.

A core to be inserted into the tube is formed according to the respective cross-section of the tube so that this within the tube one, the rolling movement of the tube rectified, independent rolling movement performs. The core rolls passively through the rolling motion of the tube causes.

The attenuation of the cutting beam energy takes place after the cutting jet has entered the core by a subsequent conversion into frictional energy and thus into heat.

The supporting elements of a water jet cutting device according to the invention are formed in an equally advantageous further ^¬ formation such that there is a linear contact area between the edit ^¬ the workpieces and the Auflageeleinenten.

By a linear contact surface excessive adhesion of dirt or Abrasivrückständen on the contact surfaces and thus obstruction of the rolling motion is largely avoided by these residues.

A linear contact surface is achieved in particular by the use of tubular or substantially pointed in the direction of the workpieces tapered Auflageelemete.

In order to optimize the friction between Wekrstück and support elements so that a slip-free rolling of the workpieces is ensured, which, in contact with the workpiece surfaces of the support elements are provided in a further advantageous embodiment of the invention with a friction-increasing coating.

A further particularly advantageous variant of the invention is characterized in that the support elements for the erection would take the tubular workpieces, relative to the cutting head, in the Z direction and thus formed adjustable in height.

A thus provided height adjustment of the Auflageele ^¬ elements allows, as a special advantage of such an adjustment of the position of tubular work pieces within the water basin, on the one hand can be omitted Z adjustment of the cutting head and that at the same time the presence of the, necessary for the attenuation of the cutting jet, the volume of water the required jobs is guaranteed. The cutting head facing the lateral surface of the tube can be kept in a particularly simple manner always at the desired level to the water level in the pool and at the desired distance to the cutting head. The inventively provided cutting head holder is formed in a likewise preferred development of the water jet cutting machine in the Z direction and thus adjustable in height relative to the workpiece.

The height adjustability of the cutting head holder makes it particularly advantageous to position the cutting head relative to the tubular workpieces such that the cutting beam provided by the cutting head strikes the outer surface of the pipe to be machined at exactly the previously defined distance.

The positioning of the cutting head relative to the pipe can be done either by a single start of the processing point on the pipe before the start of the cutting process or by a continuous readjustment of the cutting head in the Z direction.

In both cases, a water jet cutting machine according to the invention with a suitable device for detecting Sizes the distance between the cutting head and workpiece verse ^¬ hen.

Both the adjustment of the support elements, as well as the Ver ^¬ position of the cutting head holder in the Z direction take place in ei ^¬ ner particularly advantageous embodiment of the invention in ^¬ within a previously defined grid.

The grid is defined so that tubular Werkstü ^¬ bridge can be processed with standard diameters.

A Z-adjustment within a grid thus allows a particularly advantageous robust, fast and kostengüns ^¬ term adaptability of the invention Wasserstrahlschneid ^¬ machine to various conventional standardized Rohrdurch ^¬ diameter.

In a further preferred embodiment of the invention, the adjustment of cutting head holder and / or support ^¬ elements in the Z direction is made continuously, for example by the use of a spindle drive.

A stepless adjustability in the Z direction allows an advantageous adaptation of the cutting head, or the workpiece position also to non-standard pipe diameter.

A water jet cutting machine according to the invention is thus quickly and easily adaptable to a wide variety of workpiece diameters.

In a further preferred embodiment, the driver of a water jet cutting ^{machine according} to the invention is on the sen, in engagement with the tubular workpiece Surface provided with a coating to reduce the adhesion.

Such a coating preferably consists of polytetrafluoroethylene, colloquially also referred to as PTFE or Teflon.

By coating the driver with agents such as PTFE, adhesion of the tube to the driver upon contact is effectively prevented and the friction reduced, which leads to an immediate initiation of the rolling movement of the tube after contact with the driver. As a result, displacement movements of the tube relative to the support element are prevented in a simple manner and a high dimensional accuracy of the machining is ensured.

The adhesion of the tubular workpiece to the driver is equally prevented in an equally preferred embodiment in that the driver is provided on the, with the tube engaging surface, with movably mounted rollers.

Alternatively, the use of balls instead of the rollers can be done.

In both cases, the contact takes place for initiating and continuing the rolling movement of the tube between the tube and the rollers, or balls of the driver by means of rolling friction.

The movably mounted rollers or balls, similar to the principle of a rolling bearing, the resulting friction between the tube and driver is effectively reduced.

The movability of the carriage in X-direction, as well as the movability of the cutting head holder in Y-direction are in a particularly advantageous embodiment of the invention realized by a linear motor.

The use of linear motors particularly advantageous accurate positioning of the cutting head over the tubular workpiece is achieved, and effectively reduces the mechanical wear compared to conventional drives such as pinions or racks.

The cutting head has, in an equally preferred development, means for chamfering and tracking compensation.

In this example, manipulators are used, which allow the cutting head to perform an additional rotational movement and thereby compensate for both the Schnittschrägenfehler, and the wake of the cutting beam.

At the same time, the invention specifies a method for processing tubular workpieces, which method comprises the following steps: a) placing a tubular workpiece on the support elements

b) Adjustment of the support elements in the Z direction

c) making the engagement of the driver to the tubular workpiece

d) delivery of the cutting head to the tubular workpiece in the Z direction

e) machining of the tubular workpiece by the cutting beam, wherein by the engagement of the driver, a, for X or Y movement of the cutting head, synchronous rolling movement of the tubular workpiece is effected on the support elements. Insofar, the inventive method is carried out in a water-jet ^¬ slitter with water basin as a collecting device, the adjustment of the support elements in process step b) simultaneously causes the filling height of the, water required for receiving the remaining power of the cutting beam in ^¬ nerhalb of the tubular workpiece.

Under delivery of the cutting head to the tubular workpiece after process step d) in this case the setting of, suitable for an optimal cutting, distance of the cutting head to the surface of the workpiece understood.

The process steps a) to d) can be in a wide Erbil ^¬ dung of the invention in other sequences. In particular, in standardized workpieces can be done adjusting the support elements in the Z direction and / or the advancing of the cutting head in the Z direction before placing the tubular workpiece and making the engagement of the driver.

The rolling movement of the tubular workpiece described in method step e) takes place in a first variant when assigning the carriers to the carriage in the X direction.

When assigning the driver to the cutting head holder, the rolling movement of the tubular workpiece takes place in a second variant in the Y direction.

As a particular advantage is omitted in a method according to the invention, when using conventional rotation means, necessary conversion of the angular velocity of the tube in the decisive for the cutting process speed of the tube circumference, since the speed of the rolling movement of the tube according to the invention always with the respective Movement speed of the cutting head in the axis of the rolling movement coincides.

The invention will be explained in more detail as an exemplary embodiment with reference to FIG. 1 schematic representation.

A water jet cutting device according to the invention for machining tubular workpieces has a carriage 1 which can be moved in the X direction and has a delivery arm 2 arranged on it.

The boom 2 is further assigned a, movable in the Y direction, cutting head holder 3 for receiving a cutting head 4.

For receiving a workpiece 6, the device has a first and second support element 5.1 and 5.2. The support elements 5 are designed so that the workpiece 6 after placing on the support elements 5 is able to perform a rolling movement in the X direction.

In order to effect as exact as possible and against impurities by abrasives or material residues contact between this and the support elements 5 during the rolling process of the workpiece 6, the support elements 5 are provided with a triangular and the workpiece 6 extending cross-section.

This cross section allows a particularly advantageous, linear contact surface between the workpiece 6 and the support elements. 5 In order to initiate and continue the rolling movement of the workpiece 6, a device of the type mentioned at the beginning has a first and a second driver 7.1 and 7.2.

The drivers 7 are formed in the embodiment shown here in the form of a, the workpiece 6 partially enclosing, clamp and fixed to the boom 2 of the device.

The workpiece 6 towards open side of the driver 7 is adapted to the diameter of the workpiece 6, that the

Although workpiece 6 between the dogs 7 is practically free of play but positioned without contact forces. Thus, it is avoided that the driver 7 with greater than for the acceleration of the workpiece 6 required forces abut the workpiece 6 and thereby generate an unintentionally large friction during the rolling operation of the workpiece 6. This slipping of the workpiece 6 on the

Support elements 5 avoided.

The formation of the carrier 7 in the form of a clamp also makes it possible to work the workpiece 6 unrestrictedly over its entire length by the cutting head 4, since no covering of the workpiece or blocking of the cutting head movement occurs at any relevant point.

Due to the fixed assignment of the driver 7 to the boom 2, the drivers 7 perform during the machining process, a synchronous to the X-movement of the carriage movement.

Due to the engagement of the driver 7 in the workpiece 6 whose rolling movement is also in the X direction and in such a way that, by the inventively provided cutting head 4 generated cutting beam (not shown) always hits radially on the outer surface of the workpiece 6.

By the cutting beam is thus particularly advantageous during the entire machining process, a radially ^{¬ to the} workpiece center axis running cutting edge generated.

Furthermore, a device according to the invention has a collecting device 8 for catching and weakening the

Cutting jet.

In the present case, the collecting device 8 as a, the cutting head opposite and with water (not shown) filled basin is formed.

The support elements 5 are arranged according to the invention below the water level, that the workpiece to be machined 6 is also partially below the water level. The immersion depth of the workpiece 6 in the collecting device 8 is chosen so that the, a machining point on the workpiece 6 opposite region of the workpiece circumferential surface is not damaged by the cutting jet.

Thus, the volume of the water on the side opposite the machining point of the workpiece 6 must be selected so that the energy of the cutting beam is reduced after penetrating the lateral surface at the processing point to a unkri ^¬ tical level.

In order to adjust the corresponding position of the supporting elements 5 within the collecting device 8, the supporting elements are designed to be adjustable in the Z-direction by means of a suitable adjusting device (not shown).

For setting the distance necessary for an exact cutting process of the cutting head 4 to the lateral surface of the workpiece Piece 6 is the boom 2 also by a suitable adjusting device (not shown) in the 2-direction movable.

A water jet cutting device of the invention thus enables a particularly simple and inexpensive machining ^¬ th unterschiedlichster workpiece diameter with high security against unwanted damage to the workpiece. 6

Used reference signs

1 sled

2 outriggers

3 cutting head holder

4 cutting head

5.1 first support element

5.2 second support element 6 workpiece

7.1 first driver

7.2 second driver

8 collecting device

Claims

claims

1. A water jet cutting machine for machining tubular workpieces, comprising at least one movable carriage in the X direction (1) with a cantilever disposed thereon, and one on the boom (2) in the Y direction arranged cutting head holder (3) for receiving a cutting head ( 4)

characterized,

in that the water jet cutting machine is assigned support elements (5) for receiving a workpiece (6) and at least one driver (7), the driver (7) being in engagement with the workpiece (6) and a ^rolling movement of the workpiece (6). on the support elements (5) causes.

2. Water jet cutting machine according to claim 1,

characterized,

in that the at least one driver (5) is associated with the carriage (1) and carries out a movement in the X direction synchronous with the movement of the carriage (1).

3. Water jet cutting machine according to claim 1,

characterized,

in that the at least one driver (5) is associated with the cutting head holder (3) and carries out a movement in the Y direction synchronous with the movement of the cutting head holder (3).

4. Water jet cutting machine according to one of the preceding claims,

characterized, in that a plurality of drivers (7) are arranged side by side on the carriage (1) or on the cutting head holder (3).

5. Water jet cutting machine according to one of the preceding claims,

characterized,

that it is associated with a collecting device (8) for catching and weakening the cutting jet.

6. Water jet ^{cutting machine} according to one of the preceding ^¬ the claims,

characterized,

in that the support elements (5) are designed such that a linear contact surface exists between the workpiece (6) and the support elements (5).

7. Water jet cutting machine according to one of the preceding claims,

characterized,

the support elements (5) have a friction-increasing coating at their contact surface to the workpiece (6).

8. Water jet cutting machine according to one of the preceding claims,

characterized,

the support elements (5) are adjustable in the Z direction.

9. Water jet cutting machine according to one of the preceding claims,

characterized, that the cutting head holder (3) is adjustable in the Z direction.

10. Water jet cutting machine according to claim 8 or 9,

characterized,

that the adjustment in Z-direction within a defi ned grid ^¬ takes place.

11. Water jet cutting machine according to claim 8 or 9,

characterized,

the adjustment in the Z-direction is stepless.

12. Water jet ^{cutting machine} according to one of the preceding ^¬ the claims,

characterized,

that the at least one driver (7) is provided with a rubbing-reducing coating.

13. Water jet ^{cutting machine} according to one of the preceding ^¬ the claims,

characterized,

that the at least one driver with movable gela ^¬ siege rollers or balls is provided, causing that the rollers or balls rolling contact between the carrier (7) and the tubular workpiece (6).

14. Water jet cutting machine according to one of the preceding claims,

characterized,

in that the movability of the carriage (1) in the X direction and the movability of the cutting head holder (3) in the Y direction are effected by a linear motor.

15. Water jet cutting machine according to one of the preceding claims,

characterized,

that this means comprises Schnittschrägen- or Strahlnachlaufkompensation.

16. Water jet cutting method for machining tubular workpieces,

comprising the following method steps:

a) placing a tubular workpiece on the

Support elements,

b) adjusting the support elements in the Z direction, c) making the engagement of the driver for

tubular workpiece,

d) delivery of the cutting head to the tubular

Workpiece in Z-direction,

e) machining of the tubular workpiece by the cutting beam, wherein by the engagement of the driver, a, for X or Y movement of the cutting head, synchronous rolling movement of the tubular workpiece is effected on the support elements.

17. A water jet cutting method for machining tubular workpieces according to claim 16,

characterized,

that the setting of the support elements according to

Process step b) and the delivery of the

Cutting head according to step d), before placing the tubular workpiece according to

Process step a) take place.

18. A water jet cutting method for machining tubular workpieces according to claim 16 or 17, characterized,

that, in an assignment of the driver to the carriage of a water jet cutting machine, the rolling movement of the tubular workpiece according to step e) takes place in the X direction.

19. A water jet cutting method for machining tubular workpieces according to claim 16 or 17,

characterized,

that, in an assignment of the driver to the cutting head, the rolling movement of the tubular workpiece according to

Process step e) takes place in the Y direction.

HERE ONE SIDE DRAWING