EP2535123A1 - Outil de pliage et agencement d'outil de pliage - Google Patents

Outil de pliage et agencement d'outil de pliage Download PDF

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Publication number
EP2535123A1
EP2535123A1 EP12171981A EP12171981A EP2535123A1 EP 2535123 A1 EP2535123 A1 EP 2535123A1 EP 12171981 A EP12171981 A EP 12171981A EP 12171981 A EP12171981 A EP 12171981A EP 2535123 A1 EP2535123 A1 EP 2535123A1
Authority
EP
European Patent Office
Prior art keywords
bending tool
forming
bending
positive locking
forming edge
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
Application number
EP12171981A
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German (de)
English (en)
Other versions
EP2535123B1 (fr
Inventor
Emanuel Schmee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trumpf Maschinen Austria GmbH and Co KG
Original Assignee
Trumpf Maschinen Austria GmbH and Co KG
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
Application filed by Trumpf Maschinen Austria GmbH and Co KG filed Critical Trumpf Maschinen Austria GmbH and Co KG
Publication of EP2535123A1 publication Critical patent/EP2535123A1/fr
Application granted granted Critical
Publication of EP2535123B1 publication Critical patent/EP2535123B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B21D5/0209—Tools therefor
    • B21D5/0227—Length adjustment of the die

Definitions

  • the invention relates to a bending tool and a bending tool arrangement formed therefrom for producing a stepped Z-bend on a workpiece in accordance with the preamble of claim 1 or the preamble of claim 17.
  • An adjustable bending tool is for example off EP 2 292 342 A1 known and has a fixed Umformkante and an adjustable Umformkante. By cooperating with a matching second such bending tool, different step heights can be produced on workpieces with one and the same bending tool arrangement.
  • the object of the invention is to provide an adjustable bending tool for Z-bends, which is simple in construction and in which the adjustment process for changing the step height is easy to carry out.
  • the second forming body has on its second forming edge opposite the base surface a first form-fitting structure, with which it can be fixed to a formed on the support surface of the tool body second positive locking structure at different engagement positions and the different engagement positions cause different distances of the second forming edge to the first forming edge,
  • An inventive bending tool requires that the cooperating second bending tool has a matching geometry, in particular the Umformkanten and it is possible to combine an inventive, adjustable bending tool with a matching, non-adjustable bending tool.
  • two adjustable bending tools according to the invention will form a bending tool arrangement for forming a workpiece.
  • the positive engagement between the second Umform Congress and body thus serves both the exact positioning of the adjustable Umform momentss and the power transmission between these components during a forming process.
  • the interlocking structure is designed such that the interlocking interlocking elements can transmit the forces occurring between the second deformable body and the base body during a bending operation and are in particular dimensioned such that the occurring shearing loads are endured without damage.
  • the interlocking structures are brought out of engagement by the second UmformMech is lifted off the base body and is then brought into another engagement position back into engagement with the main body. This can be done easily and preferably without tools.
  • a deactivatable fixing is formed on the base body or on the first Umformentrepreneur that holds the form-fitting structure of the second Umform stressess engaged with the second form-fitting structure.
  • This fixing arrangement ensures that the second forming body also remains in engagement with the form-locking structure on the base body, if tensile forces occur during the opening of the bending tool arrangement, through which the second forming body could be released.
  • the fixing arrangement can be deactivated or released.
  • the fixing arrangement can bring about a form-locking or non-positive position securing of the second deformable body and, furthermore, can preferably be activated or deactivated without tools.
  • a plug-in element which passes through the second Umform manipulate and the main body or the second Umform stresses and the first Umform stresses simultaneously, may be provided.
  • a motion guide of the second forming body may be provided on the first forming body or on the base body, e.g. a dovetail guide or T-slot guide, which is blocked by a blocking element and thereby a movement of the second Umform stressess in the motion guide and the release of the interlocking structures is prevented.
  • a spring element can be provided which presses the form-fitting structure of the second deformation body with a certain minimum force against the positive-locking structure on the main body or on the first forming body.
  • a structural design of the interlocking structures with good power transmission and the ability to adjust exact step heights in a simple manner is achieved when the first and second form-fitting structure by at least one plug projection and with this corresponding plug recesses or by teeth with constant pitch at the base surface of the second Forming body and formed on the support surface on the tool body.
  • the design with cooperating plug-in projections and plug-in recesses on the base body and the adjustable, second formed body corresponds to a punctual fixation of the second Umform emotionss, while a parallel to the Umformkanten teeth represents a line-like fixation and contact between the second Umformoasa and body.
  • the toothing has tooth flanks which extend approximately parallel to the forming surface bounding the intermediate space between the first and second forming edges and adjoining the second forming edge on the second forming body.
  • the forming force acting on the second forming body by the second bending tool and the workpiece to be formed is thereby transferred from approximately perpendicular surfaces between the forming body and the base body.
  • the wedge-like tooth flanks ensure a largely backlash-free fit of the second forming body on the body even with large forming forces.
  • tooth flank angle of the cooperating teeth is about 90 °, there is an optimal compromise between positive engagement parallel to the support surface and mechanical load capacity. Furthermore, such tooth flank angles can be produced economically with standard tools.
  • the second forming edge is at the same height when viewed in the working direction at all engagement positions and advantageously the second forming edge comes into contact with the workpiece simultaneously with the first forming edge in all engagement positions of the second forming body ,
  • a relief in positioning the workpiece to be bent on the bending tool is further given when formed on the first forming a subsequent to the first forming edge, perpendicular to the working surface contact surface. This results in a bearing surface perpendicular to the working direction and thus in most cases a horizontal contact surface.
  • first forming edge and the second forming edge are arranged at the same height.
  • first forming edge and the second forming edge are arranged at the same height.
  • a practical advantageous embodiment is that the grid pitch or tooth pitch is chosen such that an adjustment to the next engagement position or about a tooth, a change in the step height on the bent workpiece by preferred Teritze, e.g. 1 mm, since a finer gradation of the step height is generally not required.
  • the relationship between grid spacing or tooth pitch and change in the step height results from the angle between the support surface and the intermediate space bounding, subsequent to the second forming edge forming surface on the second forming body.
  • the second Umform morcell has at least one aligned parallel to the adjustment guide extension, which engages in a guide recess of the first Umform stressess or the body.
  • the guide recess is designed in such a way that it permits the movements required for an adjustment process for the guide extension, but inhibits or prevents a separation of the second deformation body from the base body, whereby the second deformation body and the base body also structurally form an associated unit.
  • the guide recess has a play transversely to the adjustment direction of the second deformation body, which at least the engagement height of the first form-fitting structure in the second Forming structure corresponds, and thereby lifting the second Umform stressess and thus releasing the first positive locking structure of the second positive locking structure allows.
  • the engagement height corresponds, for example, to the tooth height of a toothing with wedge-shaped or rectangular tooth profile cross-sections.
  • the base surface or the support surface with the respective form-fitting structure can thereby have a larger area, since it does not have to be interrupted for the purpose of fixing.
  • the fixing arrangement can function on a non-positive basis, for which purpose the fixing arrangement comprises an elastic spring element which effects a prestressing of the first form-fitting structure in the direction of the second form-fitting structure.
  • the fixing arrangement comprises an elastic spring element which effects a prestressing of the first form-fitting structure in the direction of the second form-fitting structure.
  • a simple way of fixing by means of a spring element is that the spring element is designed as a tension spring element arranged on the main body.
  • a tension spring can be arranged in a recess, for example in a shaft extending parallel to the working direction, within the base body and attached to the lower end of this shaft and to the underside of the second deformation body, whereby a biasing force in the direction of engagement of the positive locking structures is effected.
  • an advantageous alternative embodiment with a spring element is that the spring element is designed as arranged on the main body compression spring element, the Guide extension in the guide recess fixed so that the first positive locking structure is pressed in the direction of the second positive locking structure.
  • Spring elements in the form of compression springs are easy to assemble because their ends do not need to be hung and therefore the assembly of such embodiments is very simple.
  • the compression spring element can act, for example, in the engagement direction of the form-fit structures by pressing in the direction of engagement on the guide extension.
  • the second forming body can be moved about an arranged between the guide extension and its form-fitting structure pivot point and serve the guide extension in a sense as a lever for the pivoting movement of the second Umform stressess.
  • a structurally likewise simple embodiment for a positive fixing of the second forming body can consist in that the fixing arrangement comprises an eccentric element mounted on the main body and acting on the second forming body or on a guide extension arranged on the latter.
  • the invention further relates to a bending tool assembly of two cooperating bending tools, wherein at least one of the bending tools, but advantageously both bending tools are designed according to the invention.
  • Fig. 1 shows a sectional view of a bending tool assembly 1, with which a workpiece 2, a step-shaped Z-bend 3 can be made.
  • an originally planar workpiece section is formed by two mutually adjacent parallel and opposite bending operations in two planar workpiece sections, which are offset by a step height 4 to each other.
  • the chevron angle of the two adjacent folds is preferably and in the following embodiments, 90 °, but also deviating Kantwinkel are possible.
  • the bending tool assembly 1 is mounted on a bending press, in particular a press brake, and comprises at least one inventive bending tool 5 for producing Z-bends, which cooperates with a second bending tool 6 for producing Z-bends.
  • the second bending tool 6 can be carried out according to the invention, or else be formed by another bending tool suitable geometry.
  • the bending tool 5 has a first rectilinear forming edge 7 and a rectilinear second forming edge 8 parallel thereto and act together with a likewise parallel third forming edge 9 and a fourth forming edge 10 on the second bending tool 6.
  • the two bending tools 5 and 6 are positioned on the bending press to each other so that a workpiece 2 is deformed during compression of the bending tools 5 and 6 of the third forming edge 9 in a gap 11 between the first forming edge 7 and the second forming edge 8 and at the same time second forming edge 8 is deformed in a second intermediate space 12 between the third forming edge 9 and the fourth forming edge 10.
  • Such a bending tool 5, 6 thus acts simultaneously as a bending die and bending punch and thereby carried two adjacent, opposite bending operations on the workpiece 2.
  • the relative movement between the bending tools 5 and 6 determines the working direction thirteenth the bending tool assembly 1 and is vertical in the illustrated embodiment as in most press brakes.
  • the bending tool 5 comprises a base body 14, with which a first deformable body 15 is fixedly connected, which has the first forming edge 7.
  • the first forming body 15 may in particular be integrally formed on the base body 14, but may also be provided as a separate component firmly connected to the base body 14.
  • the second forming edge 8 is arranged on an adjustable second forming body 16 and can be changed in their distance 17 to the first forming edge 7, whereby the step height 4 of a Z-bend 3 changes.
  • the second deformed body 16 is supported by a base surface 18, which lies approximately opposite the second deforming edge 8, on a support surface 19 on the base body 14 and here the forces occurring during a forming process are transmitted between the second deformable body 16 and the base body 14.
  • the second forming body 16 has on its base surface 18 a first form-fitting structure 20 which engages in a second form-fitting structure 21 on the support surface 19 of the base body 14.
  • the interlocking structures 20 and 21 are in Fig.
  • the interlocking structures 20 and 21 have known from the prior art combinations of corresponding projections and recesses, with which the second Umformigen 16 can be brought into at least two different positions on the base body 14 in engagement.
  • the second formed body 16 is shown in solid lines in a first engagement position 22 and shown in dashed lines in a second engagement position 23.
  • more than two engagement positions 22, 23, ... may be provided, which are made possible by the execution of the form-fit structures 20 and 21.
  • Fig. 1 is indicated by a double arrow, the adjustment movement 25 of the second Umform stressess 16, which connects the various engagement positions 22, 23, ....
  • a relative displacement of the base surface 18 is prevented on the support surface 19 and consists of the actual adjustment 26 as indicated by a double-angled double arrow, for example, a lifting of the second Umform stressess 16, whereby the positive connection is achieved, a displacement of the second Forming body 16 and a lowering of the second Umform stressess 16, whereby the form-fitting is restored to a different engagement position.
  • Fig. 1 shows further that on the base body 14 or on the first Umform Sciences 15 a deactivatable fixing 27 may be provided, which holds the interlocking structure 20 of the second Umform stresses 16 in engagement with the second interlocking structure 21.
  • the fixing arrangement is in Fig. 1 simplified by a rectangle indicated, and acts between the first forming body 15 and the second forming body 16 whereby an undesirable loosening of the two form-fitting structures 20, 21 during use of the bending tool 5 is prevented. This ensures that when using the bending tool 5, the second formed body 16 remains at its engagement position, even if optionally acting on him tensile forces in the direction of work 13.
  • the fixing assembly 27 may act positively, and for example comprise a plug-in element, and act additionally or alternatively non-positively, for example by an elastic spring element. In other embodiments, various possibilities of the fixing arrangement 27 are shown.
  • the first forming body 15 has in Fig. 1 an adjoining the first forming edge 7, perpendicular to the direction of contact surface 28, which is helpful in their pre-positioning of a workpiece 2 to be bent by their horizontal orientation.
  • Fig. 2 is a further and possibly independent embodiment of a bending tool assembly 1 with a bending tool according to the invention 5 shown, again for like parts, the same reference numerals or component designations as in the preceding Fig. 1 be used. To avoid unnecessary repetition, the detailed description in the previous one Fig. 1 are referred to and in consequence mainly compared to the embodiment according to Fig. 1 deviating or additional features described.
  • the first form-fitting structure 20 on the base surface 18 of the second deformation body 16 comprises in the exemplary embodiment according to FIG Fig. 2 a plug-in projection 29, which protrudes downwards in the working direction 13 relative to the base surface 18 and can be inserted into one of at least two plug-in recesses 30 which together form the second form-fitting structure 21 on the support surface 19 of the base body 14.
  • a plug-in projection 29 and plug-in recesses 30 are to be dimensioned according to the expected load by forming forces in their cross-sections and in their number, and this design can be done mathematically or based on a few experiments.
  • Plug-in projections 29 and plug-in recesses 30 can also be referred to as plug-in grids 31, in particular if they have constant pitches or distances between the individual form-fitting elements.
  • FIG. 2 shows a fixing assembly 27 which holds the form-fitting structures 20 and 21 by means of a spring member 32 in frictional engagement and has for this purpose a tension spring element 33 which connects the second forming body 16 with the base body 14 and is arranged in a recess 34 in the base body 14.
  • a tension spring element 33 which connects the second forming body 16 with the base body 14 and is arranged in a recess 34 in the base body 14.
  • the plug-in projection 29 may be formed pin-shaped and the plug-in recesses 30 through holes in the support surface 19, whereby a punctually acting positive locking of the second Umform stresses 16 is effected.
  • the plug-in projection 29 may be designed as a connector strip which extends parallel to the Umformkanten 7, 8 and the plug-in recesses 30 are formed in this case by plug-in grooves. This results in a linear load transfer between the second forming body 16 and the base body 14, which despite a structurally simple to produce design causes a stable position assurance of the second Umform stressess 16.
  • Fig. 3 Fig. 4 and Fig. 5 is a further and possibly independent embodiment of the bending tool 5 is shown, again for like parts, the same reference numerals or component names as in the preceding Fig. 1 and 2 be used. In order to avoid unnecessary repetition, the detailed description in the previous ones will be used Fig. 1 and 2 are referred to and referred to and mainly only deviating or additional features are described below.
  • the first positive locking structure 20 is formed by a formed on the base surface 18 teeth 35, the engages in a corresponding toothing 36 on the support surface 19, which represents the second positive locking structure 21.
  • the teeth 35, 36 have a matching tooth pitch 37 and thereby the second forming body 16 can be positioned on at least two, preferably a plurality of engagement positions 22, 23, ... on the base body 14 again.
  • the tooth flank angle 38 is preferably 90 °, but may also occupy smaller or larger angles.
  • the teeth 35, 36 have in the illustrated embodiment tooth flanks 39 which are parallel to a subsequent to the second forming edge 8 and the space 11 delimiting Umform Chemistry 40, whereby an optimal support of the second Umform stresses 16 is given to the base body 14. Due to the fact that the adjustment direction 25 in the exemplary embodiment shown encloses an angle of 45 ° to the direction of the step height 4, a graduation 37 of approximately 1.41 mm results in a gradation for the step height 4 of approximately 1 mm per adjustment about one tooth.
  • the adjustable, second formed body 16 has a cuboid guide extension 41, which is aligned parallel to the adjustment direction 25 and projects into a guide recess 42 in the first forming body 15. Between the guide extension 41 and the guide recess 42, a support 43 is provided, which prevents a lifting of the second Umform stressess 16 in the working direction 13. Nevertheless, in order to change the engagement position 22, 23 of the second Umform stressess 16, the guide recess 42 is extended downward, whereby the bottom 44 of the guide extension 41 has a range of motion down.
  • the second formed body 16 can be pivoted by this formation of the guide recess 42 relative to the base body 14, since the guide extension 41 has a margin down.
  • the engagement between the teeth 35 and 36 is repealed and the second Umform stresses 16 in different engagement positions 22, 23, ... can be adjusted.
  • a spring element 32 is provided in the form of a compression spring 45 which is mounted in a recess 34 in the body and causes the guide extension 41 within the guide recess 42 in the normal use of the bending tool 5 after is pressed up, causing the intervention the teeth 35 and 36 is maintained.
  • the second deformable body 16 with the guide extension 41 can be pivoted by this embodiment of the guide recess 42 about a pivot point 46 at the left upper end of the guide recess 42 and thereby the engagement of the form-fitting structures 20, 21 are made or canceled.
  • the adjusting movement 26 thus comprises two pivoting movements in this embodiment.
  • Fig. 5 is a view according to arrow V in Fig. 3 represented, over the length of the Umformkanten 7, 8 distributed a plurality of such guide extensions 41, which engage in guide recesses 42 may be provided.
  • Fig. 6 shows a view of a further embodiment of a bending tool, wherein the fixing assembly 27 is designed based on positive engagement and guide extension 41 and guide recess 42 substantially in accordance with the embodiment Fig. 3 to 5 correspond.
  • the guide extension 41 is fixed by a positive locking element 47 in the guide recess 42 by the guide extension 41 is pressed in the guide recess 42 upwards and thereby also, as in the embodiment according to Fig. 5 the engagement of the form-fitting structures 20, 21 is ensured since a pivoting of the second deformable body 16 with the guide extension 41 is blocked.
  • the positive locking element 47 is in Fig. 6 formed by an eccentric element 48, for example, which is rotatably mounted on the base body 14. By rotating the eccentric element 48, the necessary clearance for carrying out the adjusting movement of the second deformable body 16 can be created for the underside 44 of the guide extension 41.
  • Fig. 7 shows a further possible embodiment of a bending tool 5, in which the interlocking structures 20 and 21 those already with reference to Fig. 1 to Fig. 3 can correspond described.
  • the fixing assembly 27 for securing the engagement of the form-fitting structures 20, 21 is structurally simple in this embodiment formed by a fixing pin 49 which is inserted into a bore 50 in the first Umform Sciences 15 and a bore 51 aligned therewith in the adjustable second Umform stresses 16.
  • the fixing pin 49 is the effective between the first Umform stresses 15 and second Umform stresses 16 positive locking element 47, which is a relative movement between the forming bodies 15, 16 prevented in the working direction 13 and thereby ensures the engagement of the form-fitting structures 20, 21 during operation.
  • Fig. 8 shows a further possible embodiment of a bending tool 5, in which the interlocking structures 20, 21 similar to the embodiment of Fig. 3 in the form of teeth 35, 36 are executed.
  • the fixing arrangement 47 comprises a positive locking element 47 that can be inserted or removed into the guide recess 42 and presses down the guide extension 41 in the guide recess 42 of the base body 14 or the first forming body 15, thus also ensuring engagement of the toothings 35, 36 is.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP20120171981 2011-06-17 2012-06-14 Outil de pliage et agencement d'outil de pliage Active EP2535123B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT8882011A AT511479B1 (de) 2011-06-17 2011-06-17 Biegewerkzeug und biegewerkzeuganordnung

Publications (2)

Publication Number Publication Date
EP2535123A1 true EP2535123A1 (fr) 2012-12-19
EP2535123B1 EP2535123B1 (fr) 2015-01-21

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EP20120171981 Active EP2535123B1 (fr) 2011-06-17 2012-06-14 Outil de pliage et agencement d'outil de pliage

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EP (1) EP2535123B1 (fr)
AT (1) AT511479B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113441577A (zh) * 2021-05-25 2021-09-28 成都飞机工业（集团）有限责任公司 一种细长z形零件复合成形装置及成形方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721418U (fr) * 1980-07-05 1982-02-03
DE202005004792U1 (de) * 2005-03-24 2005-05-25 Keiper Gmbh & Co. Kg Abkantwerkzeug
EP2292342A1 (fr) 2009-08-13 2011-03-09 Osamu Makino Outils de pliage pour presse de pliage

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847053A (en) * 1954-06-07 1958-08-12 Hardman Leon Die means for forming deep bends
AT342945B (de) * 1976-04-02 1978-04-25 Haemmerle Ag Maschf Biegewerkzeug
DE2815282A1 (de) * 1977-12-06 1979-06-07 Leleu Sa Marcel Biegewerkzeug fuer abkant- bzw. biegepresse
JPH01271011A (ja) * 1988-04-22 1989-10-30 Osamu Makino プレス曲げ加工用工具

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721418U (fr) * 1980-07-05 1982-02-03
DE202005004792U1 (de) * 2005-03-24 2005-05-25 Keiper Gmbh & Co. Kg Abkantwerkzeug
EP2292342A1 (fr) 2009-08-13 2011-03-09 Osamu Makino Outils de pliage pour presse de pliage

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113441577A (zh) * 2021-05-25 2021-09-28 成都飞机工业（集团）有限责任公司 一种细长z形零件复合成形装置及成形方法
CN113441577B (zh) * 2021-05-25 2022-10-25 成都飞机工业（集团）有限责任公司 一种细长z形零件复合成形装置及成形方法

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Publication number Publication date
AT511479B1 (de) 2012-12-15
EP2535123B1 (fr) 2015-01-21
AT511479A4 (de) 2012-12-15

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