WO2016097984A1 - Bending machine for bending tubes, profiled sections, sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine - Google Patents

Bending machine for bending tubes, profiled sections, sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine

Info

Publication number
WO2016097984A1
WO2016097984A1 PCT/IB2015/059615 IB2015059615W WO2016097984A1 WO 2016097984 A1 WO2016097984 A1 WO 2016097984A1 IB 2015059615 W IB2015059615 W IB 2015059615W WO 2016097984 A1 WO2016097984 A1 WO 2016097984A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
bending
rollers
roller
force
rotation
Prior art date
Application number
PCT/IB2015/059615
Other languages
French (fr)
Inventor
Mauro Meliga
Original Assignee
Mauro Meliga
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/002Positioning devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/004Bending sheet metal along straight lines, e.g. to form simple curves with program control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/14Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/08Bending rods, profiles, or tubes by passing between rollers or through a curved die
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/12Bending rods, profiles, or tubes with programme control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/14Bending rods, profiles, or tubes combined with measuring of bends or lengths

Abstract

The machine comprises three bending rollers (12, 14, 16) supported for rotation about respective axes of rotation (x1; x2, x3), motor means (18, 20, 22, 24) for driving the bending rollers (12, 14, 16) to rotate about the respective axes of rotation (x1; x2, x3), adjustment means (28, 34, 38) for adjusting the position of at least one (x1) of the axes of rotation (x1; x2, x3) to adjust the bending radius, of a workpiece (P) to be bent, and force measuring means (36) associated to at least one (12) of the three bending rollers (12, 14, 16) to measure the reaction force (R) applied by the workpiece (P) on the at least one roller (12).

Description

Bending machine for bending tubes, profiled sections', sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine The present invention relates to a bending machine for bending tubes, profiled sections, sheets and the like, of the type comprising three bending rollers arranged with their axes parallel to each other, the rollers being movable relative to each other to cause the material to be bent (be it a tube, a profiled section or a sheet) to move, passing through the bending rollers, along a curved path having the desired bending radius.

In the bending machines of the above-identified type all the three bending rollers are normally driven into rotation at the same angular speed, each about its axis of rotation coinciding with its geometric axis. It is however known to drive into rotation only one or two of the three bending rollers. Normally, the relative position of the three bending rollers can be adjusted according to one of the following three modes: pyramidal mode, pyramidal mode with adjustable centre to centre distance and double independent adjustment mode. According to the pyramidal adjustment mode, the two side bending rollers are stationary while the middle bending roller is movable, normally in the vertical direction, towards or away from an axis passing through the centres of the two side bending rollers. According to the pyramidal adjustment mode with adjustable centre to centre distance, in addition to the vertical movement of the middle bending roller there is allowed the movement of the two side bending rollers along the axis passing through their centres, which enables to adjust also the centre to centre distance of the two side bending rollers, in addition to adjusting the distance of the centre of the middle roller from the axis passing through the centres of the two side bending rollers. Finally, according to the double independent adjustment mode, the middle bending roller is stationary while the two side bending rollers are mounted on straight slides or tilting levers so that the axes of the two side bending rollers are movable along respective straight or curved paths. Irrespective of the mode used to adjust the relative position of the three bending rollers, the principle on which the operation of a bending machine of the above-identified type is based is that adjusting the relative position of the three bending rollers allows to adjust the interference with which the work- piece to be bent passes between the bending rollers, and therefore to adjust also the result- ing bending radius. The higher the interference, the smaller the resulting bending radius.

It is an object of the present invention to provide a bending machine of the above- identified type, which is able to ensure higher precision than the prior art.

This and other objects are fully achieved according to the present invention by virtue of a bending machine having the features set forth in the enclosed independent claim 1.

Advantageous embodiments of the invention are defined in the dependent claims, the sub- ject-matter of which is to be intended as forming an integral and integrating part of the following description.

In short, the invention is based on the idea of providing at least one of the bending rollers with a force measuring device arranged to measure the reaction force applied by the work- piece on that roller. The use of one or more force measuring devices associated to one or more bending rollers of the bending machine makes it possible to control the reaction force applied by the workpiece on that roller(s) and, based on the information thus obtained, to adjust in micrometric manner the position of one or more bending rollers to compensate for possible differences in the bending radiuses due to differences in the mechanical properties of the workpieces.

Further features and advantages of the invention will become apparent from the following detailed description, given purely by way of non-limiting example with reference to the appended drawings, where:

Figures 1 and 2 are a front view and a side view, respectively, of a bending machine according to the present invention;

Figure 3 is an exploded view of an adjustment mechanism for adjusting the position of the middle roller, which mechanism can be used on a bending machine according to the invention; and

Figure 4 schematically shows the principle of operation of the bending machine of

Figures 1 and 2. With reference first to Figures 1 and 2, a bending machine according to an embodiment of the present invention is generally indicated 10. More specifically, the bending machine illustrated in Figures 1 and 2 is designed to bend tubes and profiled sections. The invention is however applicable also to bending machines designed to bend sheets. The bending raa- chine 10 comprises three bending rollers, namely a first bending roller (or middle bending roller) 12, whose axis of rotation is indicated X | , and a pair of second bending rollers (or side bending rollers) 14 and 16, whose axes of rotation are indicated x2 and x3, respectively. The axes of rotation X | , x2 and x3 of the three bending rollers 12, 14 and 16 extend horizontally and are parallel to each other.

In the illustrated embodiment, the middle bending roller 12 is adjustable, in that its axis of rotation xi can be moved along an adjustment direction z, which is preferably a vertical direction. The axes of rotation x2 and x3 of the two side bending rollers 14 and 16 are vertically aligned, in that they lie in a same horizontal plane. In the example shown in Figures 1 and 2 the two side bending rollers 14 and 16 are stationary, i.e. the position of their axes of rotation x2 and x3 is fixed. The two side bending rollers 14 and 16 might however be adjustable, in that their axes of rotation x2 and x3 might be horizontally movable towards or away from each other in order to allow to change the distance between the centres of these rollers.

In per-se-known manner, the bending machine 10 further comprises a motor unit arranged to drive the three bending rollers 12, 14 and 16 to rotate at the same angular speed about the respective axes of rotation xi, x2 and x3. In the embodiment illustrated in Figures 1 and 2, the motor unit comprises an electric motor 18, which drives three cardan shafts 24 (only two of which are shown in Figure 2) to rotate at the same angular speed through an angle . gear 20 and a gear set 22, each of the cardan shafts being coupled at an end thereof to a respective shaft 26 on which a respective bending roller 12, 14 or 16 is mounted so as to be drivingly connected for rotation therewith. However, the motor unit might also be different from the one shown in the drawings.

The bending machine 10 further comprises an adjustment mechanism arranged to adjust the position of the axis of rotation xi of the middle bending roller 12 along the adjustment direction z (in the present case a vertical direction). The adjustment mechanism comprises an electric motor 34 which is arranged above the axis of rotation X | and controls, through a transmission member (not shown), the movement of a carriage (not shown) supporting a shaft (not shown) on which the middle bending roller 12 is mounted so as to be drivingly connected for rotation therewith. Since the reaction force applied by the workpiece on the middle bending roller 12 is directed upwards, the transmission member controlled by the electric motor 34 must transmit to the middle bending roller 12 a force directed downwards and therefore works under compression. In case of a bending machine in which the two side bending rollers 14 and 16 are also made as adjustable rollers, there will be additional adjustment mechanisms for adjusting the position of the axes of rotation x2 and x3 of these rollers.

Figure 3 shows in detail another embodiment of an adjustment mechanism associated to the middle bending roller 12, according to which the electric motor 34 controlling the movement of the axis of rotation X | of the middle bending roller 12 is placed beneath this axis. With reference to Figure 3, the adjustment mechanism comprises a linear actuator 28 operatively connected, through a transmission member 38 which is made for example as a rod, to a carriage 30 which is mounted on a support plate 32 so as to be slidable in the adjustment direction z (in the present case, a vertical direction) and rotatably supports the shaft 26 and the respective middle bending roller 12. The linear actuator 28 is controlled by the electric motor 34. Therefore, control of the linear actuator 28 by means of the electric motor 34 enables to make the carriage 30 slide vertically and hence to change the vertical position of the axis of rotation X | of the middle bending roller 12. In this case, the transmission member 38 works by pulling the carriage 30 downwards, against the reaction force which is applied by the workpiece on the middle bending roller 12, and hence on the carriage 30, and is directed upwards, and is thus loaded under traction. Naturally, the adjustment mechanism associated to the middle bending roller 12 might have a configuration other than the one proposed herein. A force measuring device 36 arranged to measure the reaction force applied by the work- piece on that roller, and therefore to measure the force applied by that roller on the work- piece, is associated to the middle bending roller 12. In the illustrated embodiment, the force measuring device 36 is a load cell and is mounted between the free end (upper end) of the transmission member 38 of the linear actuator 28 and the carriage 30, in such a manner that the reaction force applied by the workpiece on the middle bending roller 12 is discharged on the carriage 30 and from the latter to the transmission member 38 via the force measuring device 36. In the embodiment of Figure 3, the force measuring device 36 (load cell) works under traction, since the associated transmission member 38 is subject to a traction load. In the adjustment mechanism of the machine of Figures 1 and 2, on the other hand, the force measuring device works under compression, as the associated transmission member is subject to a compression load.

The force measuring device 36 is connected, in a manner that is not shown but is however of per-se-known type, to an electronic control unit of the machine (also not shown) so as to transmit to the latter a signal indicative of the measured reaction force. The electronic control unit of the machine is thus able to control the reaction force applied by the workpiece on the middle bending roller 12 and, if necessary, to suitably adjust, based on this information, the position of the axis of rotation xi of this roller. Similar force measuring devices may be associated also to the two side bending rollers 14 and 16 to allow the electronic control unit of the machine to control the reaction forces applied by the workpiece on these two rollers as well.

Finally, Figure 4 schematically shows the principle of operation of the bending machine 10 described above. With reference to Figure 4, the workpiece (indicated P) is bent while passing through the three bending rollers 12, 14 and 16. The workpiece P applies on the middle bending roller 12 a reaction force (indicated R) which is measured by the force measuring device 36 associated to this roller, which force measuring device is preferably interposed between a support element (for example the carriage 30) for supporting the roller 12 and the free end of the transmission member 38 through which the electric motor 34 (here not shown) adjusts the position of the axis of rotation xi of the roller 12. Naturally, the principle of the invention remaining unchanged, the embodiments and the constructional details may vary widely from those described and illustrated purely by way of non-limiting example, without thereby departing from the scope of the invention as de- fined in the appended claims.

For example, as already mentioned above, although the bending machine according to the invention is described and illustrated herein with reference to its application to the bending of tubes and profiled sections, it is also applicable to the bending of sheets. In case of a bending machine for bending sheets, only the shape of the rollers and the way they are supported will be different. The rollers, in fact, will have a length (axial size) larger than that of rollers designed for the bending of profiled sections and will have to be supported at both their axial ends. In this case, it will be necessary that the bending roller(s) for which it is desired to measure the reaction force applied by the workpiece thereon be provided with two force measuring devices, one for each axial end of the roller(s).

Claims

1. Bending machine (10) for bending tubes, profiled sections, sheets and the like, comprising
three bending rollers (12, 14, 16) supported for rotation about respective axes of rotation (X| , x2, x3),
motor means (18, 20, 22, 24) for driving the bending rollers (12, 14, 16) to rotate about the respective axes of rotation (xi, x2, x3), and
adjustment means (28, 34, 38) for adjusting the position of at least one (xi) of the axes of rotation (xi, x2, x3) to adjust the bending radius of a workpiece (P) to be bent, characterized in that it further comprises force measuring means (36) associated to at least one (12) of the three bending rollers (12, 14, 16) to measure the reaction force (R) applied by the workpiece (P) on said at least one roller (12).
2. Machine according to claim 1 , wherein said force measuring means (36) are associated to the bending roller(s) (12) having an adjustable axis of rotation (xi).
3. Machine according to claim 2, wherein said force measuring means (36) comprise a load cell.
4. Machine according to claim 3, wherein said at least one bending roller (12) is mounted on a shaft (26) supported for rotation on a carriage (30) which is slidably mounted along an adjustment direction (z), wherein said adjustment means (28, 34, 38) comprise a linear actuator (28) arranged to control the movement of the carriage (30) along the adjustment direction (z) and wherein the load cell (36) is mounted between the carriage (30) and a free end of a control member (38) of the linear actuator (28).
PCT/IB2015/059615 2014-12-15 2015-12-15 Bending machine for bending tubes, profiled sections, sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine WO2016097984A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITTO2014A001036 2014-12-15
ITTO20141036 2014-12-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20150823786 EP3233322A1 (en) 2014-12-15 2015-12-15 Bending machine for bending tubes, profiled sections, sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine

Publications (1)

Publication Number Publication Date
WO2016097984A1 true true WO2016097984A1 (en) 2016-06-23

Family

ID=52464511

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/059615 WO2016097984A1 (en) 2014-12-15 2015-12-15 Bending machine for bending tubes, profiled sections, sheets and the like, with a measuring system for measuring the reaction force applied by the workpiece on the bending roller(s) of the machine

Country Status (2)

Country Link
EP (1) EP3233322A1 (en)
WO (1) WO2016097984A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106077181A (en) * 2016-08-12 2016-11-09 长兴正贸物流设备有限公司 Straight plate bending machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1085839B (en) * 1959-02-09 1960-07-28 Berg Roehrenwerk Geb Method of bending sheet metal stronger, especially steel plates to longitudinally slit Hohlkoerpern such. B. pipes and apparatus for carrying out the method
DE3416133A1 (en) * 1984-05-02 1985-11-07 Bernd Schuessler Apparatus for bending tubular material or material in strand form, in particular wire
EP0239364A2 (en) * 1986-03-27 1987-09-30 Caledonian Mining Company Limited A drive system for a bending machine
EP0919302A2 (en) * 1997-11-27 1999-06-02 Promau S.R.L. Roll bending machine with selective digital control device
EP1000676A2 (en) * 1998-11-04 2000-05-17 Kawasaki Steel Corporation Bending rolls, and pipe formed thereby

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1085839B (en) * 1959-02-09 1960-07-28 Berg Roehrenwerk Geb Method of bending sheet metal stronger, especially steel plates to longitudinally slit Hohlkoerpern such. B. pipes and apparatus for carrying out the method
DE3416133A1 (en) * 1984-05-02 1985-11-07 Bernd Schuessler Apparatus for bending tubular material or material in strand form, in particular wire
EP0239364A2 (en) * 1986-03-27 1987-09-30 Caledonian Mining Company Limited A drive system for a bending machine
EP0919302A2 (en) * 1997-11-27 1999-06-02 Promau S.R.L. Roll bending machine with selective digital control device
EP1000676A2 (en) * 1998-11-04 2000-05-17 Kawasaki Steel Corporation Bending rolls, and pipe formed thereby

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106077181A (en) * 2016-08-12 2016-11-09 长兴正贸物流设备有限公司 Straight plate bending machine

Also Published As

Publication number Publication date Type
EP3233322A1 (en) 2017-10-25 application

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