EP3253507A1 - Bending apparatus with measuring device - Google Patents
Bending apparatus with measuring deviceInfo
- Publication number
- EP3253507A1 EP3253507A1 EP16709678.3A EP16709678A EP3253507A1 EP 3253507 A1 EP3253507 A1 EP 3253507A1 EP 16709678 A EP16709678 A EP 16709678A EP 3253507 A1 EP3253507 A1 EP 3253507A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- sensor
- measuring device
- laser beam
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005452 bending Methods 0.000 title description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 33
- 230000008859 change Effects 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 description 8
- 238000003754 machining Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0272—Deflection compensating means
Definitions
- the invention relates to a manufacturing device, in particular a press brake, and a method for forming workpieces made of sheet metal according to the preambles of claims 1 and 17.
- the known measures usually do not work without previous test series in which the dependence or the relationship between the forming force and the resulting press beam deflection is determined.
- the invention has for its object to provide a bending method or a bending device with which even at comparatively large bending lengths a deflection of the press bars can be compensated with a higher reliability.
- the object of the invention is achieved by a production device, in particular a
- Press brake for forming a work piece from sheet metal with a press table and a press beam opposite and parallel to the press table.
- the press beam is adjustable relative to the press table by means of a drive device in a direction perpendicular to a longitudinal extent of the press beam, wherein the drive device comprises at least three drive units, which are distributed over the longitudinal extent of the press beam.
- a measuring device for measuring the instantaneous position of individual points on the pressing beam and a control device for adapting a deformation of the pressing beam is formed, wherein the measuring device comprises a laser transmitter for generating a aligned in the longitudinal extent of the press beam laser beam.
- the measuring device comprises a plurality of sensor arrangements for detecting the laser beam, wherein the sensor arrangements are fastened to the pressing beam.
- the sensor arrangements each comprise a spatially resolving sensor for detecting the laser beam.
- the sensor arrangements each comprise a CCD sensor. This has the advantage of a high accuracy of the position measurement, since no moving parts are required or available in the measuring device.
- the sensors are arranged laterally offset with respect to the propagation direction of the laser beam and perpendicular to the direction of movement of the press beam to each other.
- the laser transmitter comprises an optical element for forming a plurality of mutually parallel laser beams or for forming a flat laser light band.
- the sensor arrangements each comprise a line sensor according to the principle of a CCD sensor.
- the sensor arrangements each comprise an optical element for deflecting the laser beam in a direction parallel to the direction of movement of the pressing beam or that the sensor arrangements each have a mirror. This is advantageous because it allows the laser light beam path to be designed to save space with a narrow or small cross-section.
- the mirror is designed as a plane mirror and this is aligned inclined with respect to the propagation direction of the laser beam by 45 °.
- the sensor arrangements are each formed with a beam splitter element. This has the advantage that only one laser beam must be provided and the cross section of the beam path can be kept correspondingly small.
- the sensors of the sensor arrangements are each attached to a mechanical guide. This also has the advantage that only one laser beam must be provided, in the course of which the sensors can be moved alternately into it.
- the measuring device comprises a spatially resolving sensor and a plurality of convex mirrors or concave mirrors for reflecting the laser beam toward the spatially resolving sensor, wherein the convex or concave mirrors are attached to the pressing beam.
- a control arrangement is arranged and the control device is designed to calculate a change in position at the location of the respective sensor from measurement signals transmitted by the sensor. This has the advantage that in the manufacturing means the formation of a control loop is possible by the straightness of the press bar can be monitored and maintained.
- the laser transmitter is attached to a guide element, wherein the guide element is guided on a part of the machine frame and is adjustable together with the pressing beam.
- the object of the invention is also independent by a method for forming a workpiece made of sheet metal with a manufacturing device, in particular a press brake, with a press table and a press table opposite and parallel aligned to the press bars solved.
- the pressing bar is adjustable relative to the press table by means of a drive device in a direction perpendicular to a longitudinal extension of the press beam, wherein the drive device is formed with at least three drive units and these drive units are distributed over the longitudinal extent of the press bar.
- a measuring device for measuring the instantaneous position of individual points is arranged on the pressing beam, wherein the measuring device is formed with a laser transmitter for generating a laser beam aligned in longitudinal extension of the pressing beam. This has the advantage of directly measuring the deformation of the press beam relative to the line defined by the light beam.
- a position change relative to the laser beam is detected at a plurality of locations of the press beam with spatially resolving sensors arranged at the locations and further that values of the position change are calculated in a control device from measurement signals transmitted by the sensors.
- Fig. 1 is a press brake for the forming of a tabular workpiece in a front view
- FIG. 2 shows the press brake according to FIG. 1 in a loaded state
- Fig. 3 is a press beam of the press brake of FIG. 1 with a measuring device for
- FIG. 4 shows the press beam with the measuring device arranged thereon according to FIG. 3;
- FIG. 5 shows the measuring device according to FIG. 3 in plan view
- Fig. 6 shows an alternative embodiment of the measuring device of the press brake in
- FIG. 7 shows an exemplary embodiment of the measuring device of the press brake with sensor arrangements comprising mirrors
- FIG. 8 shows an exemplary embodiment of the measuring device with sensor arrangements comprising beam splitters
- FIG. 9 shows an exemplary embodiment of the measuring device with curved sensor systems comprising curved mirrors; 10 shows an embodiment of the measuring device with a arranged on a stator side cheek of the press brake laser transmitter.
- Fig. 1 shows a press brake in a front view.
- the press brake 1 serves as a manufacturing device for the forming of a tabular workpiece 2, for example, to a housing part or a profile part.
- the press brake 1 comprises as a machine frame 3, a frame-shaped arrangement of a bottom plate 4, a left and a right upright sidewall 5, 6 and a two side bolsters 5, 6 in their upper end region supporting cross-dressing 7.
- a fixed press table 8 is arranged in a lower end of the machine frame 3.
- a die 9 is arranged on the press table 8 .
- a guide assembly 12 is connected to one of the two stator side walls 5, 6 respectively.
- the pressing beam 11 carries on a press table 8 opposite supporting surface 13 a male part 14 as an upper bending tool.
- a drive is provided sanction, which comprises four drive units 15 according to this embodiment.
- the drive units 15 may be formed for example by hydraulic cylinders or servomotors with adjusting spindles. With the help of the drive units 15, the pressing beam 11 is moved against the press table 8, whereby in the sequence lying between the die 9 and the male part 14 workpiece 2 is bent. The action of the deformation forces on the workpiece 2 is accompanied in response to the formation of an internal stress state of both the press table 8, the press beam 11 and the components of the machine frame 3. It can therefore lead to a more or less large deformation of the parts of the machine frame. 3 and in particular of the press bar 11 and the press table 8 come.
- the support surface 13 of the press bar 11 and the support surface 10 of the press table 8 is important.
- two drive units 16 are also arranged on the press table 8. These drive units 16 are supported on the bottom plate 4 and it is thus possible to act on two support points a force on the press table 8. This should also in the press table 8 as far as possible compensation of the deformation of its support surface 10 can be achieved.
- this includes a control device 17.
- a measuring device 18 for measuring the deflection of the Pressbal- kens 11 is provided.
- FIG. 2 shows the press brake 1 during the bending process of the workpiece 2.
- the male part 14 is in a position already partially penetrated into the die 9 and therefore appears the workpiece 2 in its front, the viewer facing area, bent upwards.
- a bending line 19 is also shown in dotted line, as in approximately a deformation of the support surface 13 of the press bar 11 - when applying equally large forces by the drive units 15 of the drive assembly of the press bar 11 - corresponds.
- a bending line 20 of the press table 8 is located on the press table 8.
- the press brake 1 according to this embodiment is designed so that with the aid of the measuring device 18, the deflection or the curvature of the bending line 19 of the press bar 11 is measured and based on the extent of deflection of the bending line 19, the drive units 15 of the press bar 11 are driven so differently that the curved bending line 19 is compensated or reset to a straight line.
- a first embodiment of the press brake 1 according to the invention will be described with reference to FIGS. 3 to 5.
- FIG. 3 shows the press beam 11 with the measuring device 18 according to a first embodiment variant.
- the measuring device 18 comprises a laser transmitter 21 and five sensors 22.
- the laser transmitter is arranged and aligned such that it can generate a laser beam 23 or a laser beam which is aligned substantially parallel to a longitudinal extent 24 of the press beam 11.
- the sensors 22 are laterally offset with respect to the direction of propagation of the laser beams 23 (FIG. 5) and thus each of the sensors 22 can receive light from the laser transmitter 21.
- FIG. 5 shows a top view of the measuring device 18 according to FIG. 3.
- a laser beam 23 is directed by the laser transmitter 21 to each of the five sensors 22.
- the laser beam 23 could also be cyclically directed from one sensor 22 to the next sensor 22 in a temporally rapid succession.
- FIG. 4 shows a frontal view of the measuring device 18 according to FIG. 3 arranged on the pressing beam 11.
- the state of the pressing beam 11 and of the measuring device 18 corresponds to the loading situation when a bending process is carried out. This is indicated by the deformation of the support surface 13 to the bending line 19.
- both the laser transmitter 21 and the sensors 22 are connected to the pressing beam 11 and secured thereto. The sensors 22 thus experience a change in position 25 relative to the laser beam 23 due to the general deformation of the press beam 11.
- the sensors 22 will detect a point of incidence of the laser beam 23 which is changed with respect to the unloaded state.
- the position change 25 respectively detected by the sensors 22 has the dimension of a length and for detecting these position changes 25 are spatially resolving sensors 22, for example, in the manner of a CCD sensor (charge-coupled device) suitable.
- CCD sensor charge-coupled device
- line sensors according to the principle of a CCD sensor are preferably provided as sensors 22.
- Measurement signals of the individual sensors 22 detected by the measuring device 18 are transmitted to the control device 17 and an evaluation of the measurement of the position changes 25 can take place therein.
- the press brake 1 can individually drive the drive units 15 of the drive arrangement of the press beam 11 in such a way that the extent of the position changes 25 at the points of the sensors 22 is reduced and finally fully compensated. In this way it can be achieved that the support surface 13 of the press bar 11 is largely returned to a re-deformed, straight state.
- the measurement of the deformation state of the press beam 11 is preferably carried out continuously with the aid of the measuring device 18 during the entire machining or forming process of the workpiece 2.
- an individual control of the drive units 15 of the drive system of the press bar 11 is performed in the press brake 1 is a total of a control circuit formed by the as a result throughout the processing process a largely straight aligned State of the press beam 11 at least at the support surface 13 can be maintained.
- the press table 8 is equipped in an analogous manner with a measuring device 26 for measuring the instantaneous state of deformation of the press table 8.
- the deformation state of the press table 8 and in particular the straightness of the support surface 10 of the press table 8 can thus also be measured and monitored with the aid of this measuring device 26.
- a corresponding control of the drive units 16 can be carried out by the control device 17.
- FIG. 6 shows a further embodiment of the press brake 1, which is possibly independent of itself, wherein the same reference numerals or component designations are used again for the same parts as in the preceding FIGS. 1 to 5. To unnecessary To avoid repetition, reference is made to the detailed description in the preceding Figs. 1 to 5 or reference.
- FIG. 6 shows an alternative embodiment variant of the measuring device 18 of the press brake 1 in plan view, that is to say with a viewing direction parallel to the direction of movement of the
- Pressing beam 11 In this form of measuring device 18, it is provided that only a single laser beam 23, which serves as a reference for measuring the deformation state of the press beam 11, is emitted by the laser transmitter 21.
- the sensors 22 are alternately moved in the lateral direction 30 in the area of the laser 23.
- the sensors 22 can be arranged, for example, on a straight guide or on a support pivotable about an axis. It can thus be detected a position change 25 which is directed perpendicular to the lateral direction 30. That is, the direction of the position change 25 corresponds to the viewing direction of the viewer on the plane of the drawing in FIG.
- the sensor arrangements 27 comprise a mirror 22 in addition to a sensor 22.
- These mirrors 28 are preferably designed as plane mirrors and at an angle of 45 ° relative to the propagation direction of the laser beam 23 to the pressing beam 11 is arranged.
- the laser beam 23 is deflected by the reflection on the mirror 28 in a direction parallel to the direction of movement of the press beam (11).
- the mirrors 28 are arranged laterally offset with respect to the propagation direction of the laser beam 23.
- FIG. 8 shows a further alternative embodiment of the measuring device 18 of the press brake 1.
- the sensor arrangements 27 are now formed by a sensor 22 and a beam splitter element 29. As shown in Fig. 8 are formed in this embodiment by prisms Beam splitter cube provided.
- the sensors With a suitable choice of the beam splitter elements 29, it is possible to arrange the sensors directly behind one another in the course of a single laser beam 23, wherein only a fraction of the light intensity is coupled out at each of the two beam splitter elements 29.
- the change in position 25 can in turn be detected by the degree of displacement of the point of impingement of the laser beam 23 on the sensor 22.
- FIG. 9 shows an exemplary embodiment of a measuring device 18 of the press brake 1 with position detecting devices which comprise concave mirrors 31.
- the change in position 25 due to the deflection of the press beam 11 on which the concave mirrors 31 are arranged now leads by deflection of the impact point on the mirrors 31 to a deflection of the laser light beam 23 in a different deflection angle 32.
- the measuring device 18 comprises in this embodiment single arranged in the region of the laser transmitter 21 sensor 22, to which the reflected from the concave mirror 31 laser beam 23 is reflected back. By the sensor 22, the point of impact of the laser beam 23 is detected as the center distance 33.
- the position change 25 can be calculated.
- differently curved mirrors, such as convex mirrors, can also be used.
- FIG. 10 shows a further alternative embodiment of the measuring device 18 of the press brake 1.
- the laser transmitter 21 is fastened to a guide element 35 separately from the press beam 11.
- This guide element 35 is moved together with the pressing beam 11 in the vertical direction up and down.
- the guide element 35 is performed on the stator side cheek 5. It can thereby be achieved that the laser transmitter 21, without being influenced by the deformation state of the press beam 11, is continuously guided in parallel in each phase of its up or down movement.
- the arrangement of five sensors or of five sensor arrangements 27 is not a restriction for the design of the measuring device 18 or 26. Thus, fewer than five such sensor arrangements 27 may be sufficient. However, it is advantageous if more than five sensors 22 or sensor arrangements 27 are provided, since this allows the loading or deformation state of the press bar 11 or of the press table 8 to be measured correspondingly more accurately.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50090/2015A AT516377B1 (en) | 2015-02-05 | 2015-02-05 | Bending device with measuring device |
PCT/AT2016/050022 WO2016123646A1 (en) | 2015-02-05 | 2016-02-05 | Bending apparatus with measuring device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3253507A1 true EP3253507A1 (en) | 2017-12-13 |
EP3253507B1 EP3253507B1 (en) | 2018-12-05 |
Family
ID=55527168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16709678.3A Not-in-force EP3253507B1 (en) | 2015-02-05 | 2016-02-05 | Bending apparatus with measuring device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3253507B1 (en) |
AT (1) | AT516377B1 (en) |
WO (1) | WO2016123646A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112355988B (en) * | 2020-09-21 | 2023-11-17 | 江苏人和环保设备有限公司 | Pulse pleat type filter cylinder processing positioning device |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1200920A (en) * | 1958-07-01 | 1959-12-24 | Device for the compensation and control of deformations undergone by the active parts of presses or similar machines | |
US5067340A (en) * | 1988-05-05 | 1991-11-26 | Macgregor Donald C | Precision press brake |
DE3943349C2 (en) * | 1988-12-29 | 2001-08-23 | Amada Co | Sheet metal bending machine |
CH680773A5 (en) * | 1989-09-11 | 1992-11-13 | Beyeler Machines Sa | |
IT1250562B (en) * | 1991-12-30 | 1995-04-20 | Prima Ind Spa | PRECISION BENDING PRESS FOR RELATIVELY SHORT SHEET PIECES. |
DE4442381A1 (en) * | 1994-11-29 | 1996-05-30 | Gerd Ising | Device to read off type and position of tool in bending machine |
JP2001219222A (en) * | 2000-02-10 | 2001-08-14 | Amada Co Ltd | Method and system for measuring machanical parameter in press brake |
DE10327388C5 (en) * | 2003-06-18 | 2011-12-08 | Leuze Lumiflex Gmbh + Co. Kg | guard |
JP5537027B2 (en) * | 2005-06-20 | 2014-07-02 | レーザー セイフ ピーティーワイ リミテッド | Imaging and safety systems and methods for industrial machines |
ITMI20062026A1 (en) * | 2006-10-23 | 2008-04-24 | Antonio Maria Banfi | PROCEDURE AND DEVICE TO COMPENSATE THE STRUCTURAL DEFORMATIONS OF A FOLDING PRESS |
JP2011083800A (en) * | 2009-10-16 | 2011-04-28 | Sumitomo Heavy Industries Techno-Fort Co Ltd | Bending press |
AT511711B1 (en) * | 2012-01-12 | 2013-02-15 | Trumpf Maschinen Austria Gmbh | MANUFACTURING DEVICE WITH BENDING TOOLS AND POSITIONING EQUIPMENT |
-
2015
- 2015-02-05 AT ATA50090/2015A patent/AT516377B1/en not_active IP Right Cessation
-
2016
- 2016-02-05 WO PCT/AT2016/050022 patent/WO2016123646A1/en active Application Filing
- 2016-02-05 EP EP16709678.3A patent/EP3253507B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP3253507B1 (en) | 2018-12-05 |
AT516377B1 (en) | 2016-05-15 |
WO2016123646A1 (en) | 2016-08-11 |
AT516377A4 (en) | 2016-05-15 |
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