DE202010002246U1 - Water jet cutter - Google Patents

Abstract

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 a cutting head movable on the boom (4) in the Y direction (5), characterized in that the boom (4) relative to the carriage (5) is rotatably mounted in B-rotation rotatably on the latter, wherein the cutting head (5) due to its positional relationship to the boom (4) whose pivoting in B- Rotation follows and wherein the B-rotation takes place around the machining point on the workpiece (3).

Description

The Invention relates to a water jet cutting machine with Schnittschrägen- and beam lag compensation.

Water jet cutting machines for the processing of different materials are according to the state of Technique known.

Such a water jet cutting machine is for example in utility model DE 202 06 427 U1 described.

These electronically controllable precision water jet cutting machine includes a slide movable in X-direction with a arranged thereon, movable in the Y direction, boom with a Cutting head, wherein the cutting head itself moved in the Z direction is.

such Water jet cutting devices usually have a fixed, in itself rotational immovable, cutting head.

The known from the prior art water jet cutting machines have the disadvantage that when separating the workpiece a chamfer error occurs due to a water jet, whereby the cutting edge is not perpendicular to the workpiece surface behaves. The generated cutting gap is on the inlet side often narrower than on the exit side.

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

Both Phenomena increase with increasing processing speed to.

Just in precision parts, these phenomena are undesirable and post-processing is necessary to be perpendicular to the surface to get standing cut surfaces.

Around To prevent the chamfer error, the cutting head must slanted by the amount of the chamfer angle be put.

Around continue to correct the beam tracking error, the cutting head needs inclined by the amount of the beam tracking angle in the direction of advance to be introduced.

Both Corrections are ideally made simultaneously and are also cut and beam lag compensation.

specially with regard to the use of new pump generations, which in able to generate a continuously high system pressure and thus a corresponding increase in the cutting speed and workpiece pass, this chamfer and beam lag compensation particularly important.

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

In this Included is a Schneidkopfführung for inclination the cutting head which is characterized in that the cutting head is clamped in a movable socket, which of several, truncated pyramidal struts is worn.

These Struts are by means of bending joints on the base plate and on the, the cutting head leading, mounted version. By the Applying control forces to the socket becomes this tilted by the struts so that the cutting head at small angles can be tilted 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 perform both a Schnittschrägen and a jet trailing compensation at the same time is in patent specification US Pat. No. 6,766,216 B2 described.

In this a 5-axis cutting system is described in which the cutting head computer-controlled, in addition to its mobility in the X, Y and Z directions, is rotatably mounted. Furthermore are after the prior art known solutions in which the Cutting head via a manipulator in the X, Y and Z direction movable machine arm is attached. By means of this manipulator the cutting head can be rotated in any direction and thus the Chamfer error and the beam lag compensated become.

Of the Cutting head is through the manipulator during necessary pivoting movements around the machining point, ie the point at which the cutting beam the workpiece hits, moves. This solution requires a complex control of the processes during the cutting process and an increase in the moving Masses on the machine arm.

A disadvantage of all solutions according to the prior art, inter alia, that the attributable to this device masses are positioned on the machine arm, lead to accelerations to increased dynamic forces entries and there require a more complex design of the machine arm.

task the invention is to provide a water jet cutting machine, with the most uncomplicated, robust and cost-effective Compensation of the chamfer error and the beam lag can be achieved and at the moving masses on the boom the device are as small as possible.

The Task is specified by the in claim 1 Characteristics solved. Preferred developments emerge from the dependent claims.

in the Following are the longitudinal, transverse and vertical axis through the Terms X, Y and Z axis described, where the X-axis a Any axis along the workpiece carrier running, the Y-axis any axis transverse to the workpiece carrier extending and the Z-axis any axis in the vertical direction progressing.

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

A The water jet cutting machine according to the invention has a X-direction movable carriage with a mounted thereto boom on, which is arranged in the Y direction.

At the boom is a traversable in Y-direction traversing attached, which carries the cutting head. The boom is rotatably mounted on the carriage in the manner that the Boom can perform a B-pivoting.

The spatial coordinates of the pivot point of the boom in the X- and Z-direction identical to those of the machining point on the workpiece. The edit point is the point at which the Water jet impinges on the workpiece surface.

By the construction according to the invention is achieved that with a necessary correction of chamfer or beam lag the X component of the correction sweep by rotating the entire boom with cutting head around the machining point is effected on the workpiece.

By the construction according to the invention is thus achieved, that on the boom no adjustment for the correction of the cutting head must be provided in the X direction.

It takes place at a, caused by the correction, skew Furthermore, the cutting head does not change the distance between Beam outlet opening on the cutting head and machining point on Workpiece, so that post-corrections for this in the Z direction are not required.

By the elimination of otherwise necessary adjustment on the boom for the corrections, those on the boom are to be moved Masses and the resulting acceleration forces reduced. The boom is thereby less burdened and must be in Regarding stiffness and vibration behavior less expensive be executed.

The remote to the processing point positioning of the boom rotation mechanism in the carriage has the consequence that the rotation mechanism through the, in the cutting process resulting impurities, less is charged.

According to the invention the boom also be designed as a bridge, which carries the cutting head and movable and rotatable to the respective opposite sides of the workpiece to be machined mounted on a carriage.

Of the Cutting head is in a preferred development of the traversing device rotatably mounted so that it can perform an A-pivoting.

Thereby the Y component of the correction tilt for the Correction of chamfer and jet lag causes.

According to the invention the rotatable bearing designed so that even during the A-rotation the fulcrum lies in the processing point.

By the described simultaneous rotation about the X and Y axis may cause the chamfer error that arises with every movement of the cutting head and beam tracking errors are corrected.

The inventive embodiment of the A and B-pivoting causes necessary corrections from cutting slope and jet lag no translational Nachstellbewegungen in X, Y and Z direction must be made.

Farther can with a device according to the invention Wasserstrahlschneidvorgänge be realized in the the cutting edge in definable and during the cutting process Changeable angles to the workpiece surface including in contours.

The Movability of the carriage is preferably by a linear motor realized, which compared to the conventional mechanical drive Offers advantages.

So For example, the slide can be positioned more accurately since in such a drive, the so-called backlash deleted. Thus, regarding parallelism and Squareness tighter tolerances can be achieved.

Of Furthermore, the mechanical wear, which in conventional Drives produced by pinions, racks and translations, reduced become.

The B-rotation of the boom, relative to the carriage, preferably via a torque motor.

A preferred embodiment of the invention provides that the boom, relative to the carriage, vertically movable in the Z direction.

Thereby In particular, it is possible before the beginning of the cutting process the adjustment of the required distance between cutting head and workpiece. Since the adjustment in Z direction moves the entire boom and in the area of the carriage is arranged, which accounts for this otherwise on the boom self-contained masses of such an adjustment. Thereby may be another mass reduction on the boom with the at described advantages of a mass reduction can be achieved.

In a preferred development, the distance between the cutting head and workpiece even during the cutting process be corrected by a move in z-direction to any eventuality Irregularities in the workpiece thickness or the workpiece support on the workpiece carrier compensate or workpieces with irregular To edit surfaces.

The Invention will be described as an embodiment with reference to

1 perspective view
explained in more detail.

The device is in 1 shown in schematic view.

On the machine frame 1 is the sled 2 arranged. The carriage is mounted in such a way that this by means of linear drive along the X-axis along the workpiece carrier 3 is movable.

On the sledge 2 is the boom 4 attached, which is transverse to the machine frame on the workpiece carrier 3 extends.

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

The axis of rotation of the boom 4 is any axis in the Y direction that 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- and Z-directions of the pivot point of the boom 4 identical to the spatial coordinates in the X and Z directions of the machining point on the workpiece.

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

To the required for the cutting process distance between the cutting head 5 and workpiece carrier 3 to generate is the boom 4 also by means of adjusting vertical, ie in the Z direction, movable on the carriage 2 attached. This allows an exact adjustment of the distance from the cutting head and machining point, since both workpieces of different thicknesses on the workpiece carrier 3 and 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 required masses in the cutting head region of the arm are eliminated. The required acceleration energy is reduced or it is faster movement state changes possible.

To the required distance between cutting head 5 and workpiece carrier 3 To ensure the entire machining process, is a first orientation run of the cutting head before the start of the cutting process 5 meaningful.

This is the cutting head 5 guided over the entire workpiece to be machined at least once and the distance between the cutting head by means of distance measuring device 5 and workpiece empirically determined at various points and stored the data.

During the later cutting process, this distance between the cutting head 5 and workpiece are then automatically corrected accordingly based on the stored data. A complex, permanent monitoring of the distance zwi cutting head 5 and workpiece during the machining process is thus not necessary.

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

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 necessary rotational correction movement of the cutting head 5 the X component of the chamfer error is due to the A rotation of the cutting head 5 itself and the Y component of the chamfer or steel tracking error due to the B rotation of the entire, the cutting head 5 leading jib 4 reached.

1

machine frame

2

carriage

3

Workpiece carrier

4

boom

5

cutting head

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 20206427 U1 [0003]
• - DE 10017039 B4 [0014]
• - US 6766216 B2 [0018]

Claims (7)

Water jet cutting machine, comprising a carriage ( 2 ) which can be moved in the X-direction on a machine frame ( 1 ), one on the carriage ( 2 ) arranged boom ( 4 ) and one on the boom ( 4 ) movable in the Y direction cutting head ( 5 ), characterized in that the boom ( 4 ) relative to the carriage ( 5 ) is rotatably mounted in B-rotation rotatably mounted on this is wherein the cutting head ( 5 ) due to its positional relationship with the boom ( 4 ) whose pivoting in B-rotation follows and wherein the B-rotation about the machining point on the workpiece ( 3 ) he follows. Device according to claim 1, characterized in that the cutting head ( 5 ) relative to the boom ( 4 ) is rotatably arranged in A-rotation on this is rotatable wherein the A-rotation takes place around the machining point on the workpiece. Device according to one of the preceding claims, characterized in that the boom ( 4 ) relative to the carriage ( 2 ) is movable in the Z direction. Device according to one of the preceding claims, characterized in that the movability of the carriage ( 2 ) in the X direction by a linear motor. Device according to one of the preceding claims, characterized in that the B-rotation of the cantilever ( 4 ) by means of a torque motor. Device according to one of the preceding claims, characterized in that the method of the cutting head ( 5 ) on the boom ( 4 ) in the Y direction by a linear motor. Apparatus according to claim 3 to 6, characterized in that the adjustment of the boom ( 4 ) takes place in the Z direction by a spindle drive.