WO2011092558A1 - Dispositif pour verrouiller des outils sur des presses-plieuses - Google Patents

Dispositif pour verrouiller des outils sur des presses-plieuses Download PDF

Info

Publication number
WO2011092558A1
WO2011092558A1 PCT/IB2010/056013 IB2010056013W WO2011092558A1 WO 2011092558 A1 WO2011092558 A1 WO 2011092558A1 IB 2010056013 W IB2010056013 W IB 2010056013W WO 2011092558 A1 WO2011092558 A1 WO 2011092558A1
Authority
WO
WIPO (PCT)
Prior art keywords
bracket
tool holder
wedge
tool
clamping
Prior art date
Application number
PCT/IB2010/056013
Other languages
English (en)
Inventor
Domenico Mazzocchi
Original Assignee
Rolleri S.P.A.
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 Rolleri S.P.A. filed Critical Rolleri S.P.A.
Publication of WO2011092558A1 publication Critical patent/WO2011092558A1/fr

Links

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

Definitions

  • This invention relates to device for locking tools on press brakes.
  • press brakes comprise an upper beam, to which a tool or punch with a lower operating end is connected, and a fixed lower beam, on which at least one die having a cavity normally formed by a "V"-shaped profile is connected.
  • the upper beam can move vertically, controlled by suitable hydraulic actuators, between a home position and an operating position. In the home position the upper beam holds the tool at a distance from the die, allowing the insertion between the tool and the die of a sheet of metal to be pressed. In the operating position, the upper beam brings the lower end of the tool partly into the cavity of the die, in such a way as to bend the sheet positioned between the two elements.
  • the press brake Depending on the thickness of the sheet to be bent, the bending angle and the material of which the sheet is made, different tools and dies are mounted on the press brake.
  • the tools are held and locked on the upper beam by means of suitable locking mechanisms which comprise a tool holder integral with the upper beam and a clamp able to move between an open position, necessary for fitting or removing the tools, and a closed position, in which the tools are rigidly connected to the tool holder, allowing pressing.
  • the locking devices are also usually equipped with a safety device to prevent the tools fitted on the upper beam from falling every time the devices are put in the open position.
  • Document WO2004052570 illustrates, for example, a locking device for press brake tools comprising a tool holder rigidly mounted on the upper beam, a clamp connected to the tool holder and comprising a supporting surface for the tool, formed by a lower hook, and a clamping surface set up to close on and lock the tool shank between the clamping surface itself and the tool holder.
  • the lower hook can engage in a groove made in the tool.
  • the clamp also comprises, on the side opposite to the hook, a sloping surface in contact with a sloping surface made on the tool holder.
  • the above-mentioned aims are achieved by providing a clamp or bracket designed to clamp the tool, which incorporates a wedge which is mobile and can engage in a suitable groove made in the tool holder integral with the upper beam.
  • this invention relates to a device for locking tools on press brakes comprising:
  • a tool holder which can be or is securely engaged with an upper beam of a press brake and comprising a first clamping surface
  • a clamping bracket connected to the tool holder and comprising a second clamping surface facing the first clamping surface, in such a way as to delimit a housing for the shank of a tool to be locked in place;
  • the clamping bracket comprising, at its lower end, a tooth which can engage in a cavity made in the tool to be locked in place;
  • the wedge can move relative to the bracket and is slidably connected to the tool holder in a plane which is sloping relative to a direction of movement of the upper beam; and in that it comprises means for pushing the wedge away from the bracket and against the tool holder, causing the bracket to perform a roto-translating movement in such a way as to lift the tool, bring it into contact with the tool holder and clamp it between the first and the second clamping surfaces.
  • That structure in which the wedge can move relative to the bracket, allows the bracket to rotate and rise (pulling the tool with it) unhindered, guaranteeing correct connection of the various elements (bracket, tool holder and tool) for closing and secure locking.
  • the tool is moved upwards until it makes contact with a lower contact surface of the tool holder. Said surface is subjected to the entire pressure during pressing.
  • This invention may also comprise one or more of the preferred features described below.
  • the wedge is preferably slidably housed in a cavity made in the bracket.
  • the wedge preferably engages in a cavity made in the tool holder.
  • the wedge comprises a first portion housed in the bracket and a second portion which comes out of the bracket and is inserted in the tool holder.
  • the overall structure is compact.
  • the wedge preferably comprises a sloping surface in contact with the tool holder in said sloping plane.
  • the cavity in the tool holder preferably comprises a sloping surface in contact with the wedge in said sloping plane.
  • the wedge comprises a sloping surface in contact with a sloping surface made in the tool holder cavity.
  • the sloping surfaces make contact with each other in the sloping plane.
  • the sloping plane preferably slopes down towards the bracket.
  • the second portion of the wedge which comes out of the bracket, has a sloping surface which is in contact with and slides on a sloping surface delimiting the tool holder cavity.
  • the means for pushing the wedge comprise at least one grub screw inserted in the bracket and comprising an end which acts on the wedge.
  • the grub screw allows precise adjustment of the roto-translating movement by the bracket and tool clamping.
  • the device comprises at least one pin fixed to the tool holder and extending in a direction substantially transversal to the longitudinal extension of the upper beam. Said at least one pin is inserted, with predetermined play, in a respective hole made in the clamping bracket, for allowing the roto-translating movement of the bracket.
  • the pin supports the bracket when it is not closed on the tool and allows the bracket to rotate and translate to correctly lock the tool in place.
  • the bracket tooth preferably comprises a plastic or rubber cover which can engage against the tool.
  • the cover preferably made of PTFE, deforms slightly during tool 16 clamping and compensates for any play between the tools 16 fitted side by side on a single bracket 10 (segmented tools), allowing the tools to make contact correctly.
  • the cover also allows the tools to be easily made to slide along the upper beam so that they can be positioned at the desired point and if necessary substituted once they are worn.
  • the device also preferably comprises elastic means interposed between the bracket and the tool holder and acting vertically on the bracket to push it downwards.
  • the elastic means assist bracket opening, achieved by unscrewing the grub screw, making the bracket movement smoother.
  • FIG. 1 is a side view, partly in cross-section, of a device according to this invention connected to a tool and in a first operating configuration;
  • Figure la is an enlarged view of a portion of Figure 1 ;
  • FIG. 1 shows the device of Figure 1 in a second operating configuration
  • FIG. 3 is a front view of the device according to the arrow "A" of Figure 1, without the tool.
  • the numeral 1 denotes in its entirety a device for locking tools on press brakes.
  • the device 1 comprises a tool holder 2 which in the preferred embodiment illustrated is an element, called an "intermediate part" in the specific technical sector, which is or can be rigidly connected, in a known way not described or illustrated, to an upper beam 3 of a press brake.
  • the tool holder 2 may be the upper beam 3 itself.
  • the tool holder 2 comprises a main body 4 connected to the upper beam 3 and a projection 5 extending below the main body 4 (when the intermediate part is mounted on the press brake) and forming a step with it.
  • the main body 4 has a surface 6 which, when the intermediate part is mounted on the press brake, remains facing towards the operator and is substantially vertical.
  • the surface 6 extends parallel with the longitudinal extension of the upper beam 3.
  • the projection 5 comprises a first clamping surface 7 which, when the intermediate part is mounted on the press brake, remains facing towards the operator and is substantially vertical.
  • the first clamping surface 7 extends parallel with the longitudinal extension of the upper beam 3.
  • the surface 6 of the main body and the first clamping surface 7 are connected by a horizontal surface 8.
  • the projection 5 also comprises a contact surface 9, preferably horizontal (that is to say, perpendicular to a direction of movement "X" of the upper beam 3).
  • the device 1 also comprises a clamping bracket 10 having a plate-shaped outline, which is connected to the tool holder 2 by pins 11 formed by flange screws.
  • the pins 11 (of which there are two in the non-limiting embodiment illustrated) pass through the through holes 12 or slots made in the clamping bracket 10, are screwed into and locked in the tool holder 2 and extend at a right angle from the first clamping surface 7.
  • Each of the pins 11 comprises a head 13 which prevents the pin 11 from slipping out of the clamping bracket 10.
  • the through holes 12 are elongate in a vertical direction and the housings for the heads 13 are sized in such a way as to allow some play for the clamping bracket 10.
  • the clamping bracket 10 has a second clamping surface 14 which, when the bracket 10 is fitted on the tool holder 2, faces the first clamping surface 7 and is spaced from it, thus delimiting a housing for the shank 15 of a tool or a punch 16 to be locked in place.
  • the tool 16 of the known type, comprises an operating portion 17, opposite to the shank 15, designed to engage with and deform the sheet to be bent, operating in conjunction with a die mounted on the lower beam (not illustrated).
  • the tool 16 also comprises a contact surface 18 alongside the shank 15 and a cavity 19 (groove) made in a surface of the tool 16 located on the opposite side of the shank 15 to the contact surface 18.
  • the clamping bracket 10 At its lower end adjacent to the second clamping surface 14, the clamping bracket 10 has a tooth 20 which can engage in the cavity 19 made in the tool 16.
  • the tooth 20 extends along the entire longitudinal extension of the bracket 10 (parallel with the longitudinal extension of the upper beam 3).
  • the tooth 20 comprises a plastic or rubber cover 20a, preferably made of polytetrafluoroethylene (PTFE), facing towards the projection 5 and upwards and designed to make contact with and to support the tool 16, as described in more detail below.
  • PTFE polytetrafluoroethylene
  • the bracket 10 also comprises, close to an upper end opposite to the tooth 20 relative to the through holes 12, a cavity 21 which is open towards the surface 6 of the tool holder 2.
  • the cavity 21 extends along the entire longitudinal extension of the bracket 10 and is delimited ( Figure la) by two parallel lateral surfaces, one upper 21a and one lower 21b and by a rear surface 21c.
  • the cavity 21 in the clamping bracket 10 partly houses a wedge 22 which can slide in the cavity 21.
  • the wedge 22 is a bar extending along the entire length of the cavity 21.
  • the wedge 22 has an outline with an upper side 22a facing the upper lateral surface 21a of the cavity 21, a lower side 22b which is opposite to the upper side 22a and facing the lower lateral side 21b of the cavity 21, a rear side 22c facing the rear surface 21c of the cavity 21, a front side 22d which is parallel with the rear side 22c and an oblique side 22e connecting the front side 22d and the lower side 22b.
  • the oblique side 22e corresponds with a sloping surface of the wedge 22 and forms a tapered portion of the wedge 22.
  • the tapered portion of the wedge 22 comes out of the cavity 21 and is housed in a cavity 23 (groove) made in the surface 6 of the main body 4 of the tool holder 2.
  • the cavity 23 in the tool holder 2 is delimited, in cross-section ( Figure la), by an upper surface 23a, a sloping surface 23c and a rear surface 23b connecting the upper surface 23a and the sloping surface 23c.
  • the sloping surface 23c of the cavity 23 in the tool holder 2 is at least partly in contact with the sloping surface 22e of the wedge 22 in a sloping plane "P" which slopes down towards the bracket 10.
  • a grub screw 24 which passes through the bracket 10 and has one end 24a inside the cavity 21 and in contact with the rear side 22c of the wedge 22.
  • An opposite end 24b of the grub screw 24 emerges from the bracket 10 on the side opposite to the cavity 21.
  • the grub screw 24 forms an element for pushing the wedge 22 away from the bracket 10.
  • a helical spring 25 is positioned around each pin 11 and acts against the tool holder 2 and against the bracket 10 in such a way as to push those two elements away from each other.
  • the elastic means 26 acting in a vertical direction above the clamping bracket 10 in such a way as to push the bracket 10 downwards.
  • the elastic means 26 comprise helical springs which are interposed between the bracket 10 and an element 27 which is securely fixed, for example using screws, to the surface 6 of the tool holder 2.
  • the bracket 10 and the wedge 22 are in the configuration shown in Figure 1.
  • the grub screw 24 is in the back position and the end 24a inside the cavity 21 is in a position close to the rear surface 21c.
  • the wedge 22 is slightly spaced from the rear surface 23b of that cavity 23 ( Figures 1 and la).
  • the shank 15 of the tool 16 is interposed between the first and second clamping surfaces 7 and 14 but is not compressed and locked between them.
  • the tool 16 contact surface 18 is slightly spaced from the projection 5 contact surface 9 ( Figure 1). The tool 16 therefore remains hanging from the tooth 20 and can be made to slide on the tooth 20 and along the upper beam 3.
  • the wedge 22 When the grub screw 24 is tightened, the wedge 22 translates in the cavity 21 in the bracket 10, is pushed into the cavity 23 in the tool holder 2 and slides on the sloping surface 23 c, moving slightly upwards and also pulling with it, in its vertical movement, the bracket 10 by means of the tooth 20.
  • the bracket 10 lifts the tool 16, opposing the elastic means 26, bringing the contact surface 18 of the tool 16 into contact with the contact surface 9 of the projection 5.
  • the deformability of the rubber or plastic cover 20a present on the tooth 20 allows even two or more tools 16 mounted on a single bracket 10 (segmented tools) to be brought into contact correctly.
  • the grub screw 24 is simply unscrewed.
  • the bracket 10 downward movement is caused not just by gravity, but also by the elastic means 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

La présente invention concerne un dispositif pour verrouiller des outils sur des presses-plieuses comprenant: un porte-outil (2) qui peut s'enclencher fermement avec un coulisseau supérieur (3) d'une presse-plieuse et comprend une première surface de serrage (7); un support de fixation (10) relié au porte-outil (2) et comprenant une seconde surface de serrage (14) faisant face à la première surface de serrage (7), de façon à délimiter un logement pour la queue (15) d'un outil (16) à verrouiller en place; un coin (22) interposé entre le support (10) et le porte-outil (2) au niveau de l'extrémité supérieure du support (10) du côté opposé par rapport à la dent (20). Le coin (22) peut se déplacer par rapport au support (10) et est relié au porte-outil (2) de façon à pouvoir coulisser dans un plan incliné (P). Une vis à pression sans tête (24) pousse le coin (22) pour l'éloigner du support (10) et le plaquer contre le porte-outil (2), amenant le support (10) à effectuer un mouvement de roto-translation de façon à élever l'outil (16), l'amener au contact du porte-outil (2) et le serrer entre les première et seconde surfaces de serrage (7, 14).
PCT/IB2010/056013 2010-01-28 2010-12-22 Dispositif pour verrouiller des outils sur des presses-plieuses WO2011092558A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2010A000110 2010-01-28
ITMI2010A000110A IT1397907B1 (it) 2010-01-28 2010-01-28 Dispositivo per il bloccaggio di utensili su presse piegatrici

Publications (1)

Publication Number Publication Date
WO2011092558A1 true WO2011092558A1 (fr) 2011-08-04

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Application Number Title Priority Date Filing Date
PCT/IB2010/056013 WO2011092558A1 (fr) 2010-01-28 2010-12-22 Dispositif pour verrouiller des outils sur des presses-plieuses

Country Status (2)

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IT (1) IT1397907B1 (fr)
WO (1) WO2011092558A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105636715A (zh) * 2013-09-13 2016-06-01 罗莱里股份公司 用于在压弯机中锁定工具的锁定设备
CN109789472A (zh) * 2016-09-26 2019-05-21 通快机床两合公司 用于加工板状工件的工具和机床以及方法
IT202200015465A1 (it) 2022-07-22 2024-01-22 Rolleri S P A Dispositivo per il bloccaggio di utensili per una pressa piegatrice

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0682995A1 (fr) * 1994-05-17 1995-11-22 Amada Metrecs Company, Limited Outil supérieur et son support pour une presse plieuse et méthode de fixation de l'outil supérieur
WO2004052570A1 (fr) 2002-12-12 2004-06-24 Aoki, Eisuke Dispositif de support de cadre superieur pour presse-plieuse
EP1762310A1 (fr) * 2005-09-13 2007-03-14 Rolleri S.p.A Dispositif de couplage et découplage rapide pour un outil supérieur d'une presse plieuse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0682995A1 (fr) * 1994-05-17 1995-11-22 Amada Metrecs Company, Limited Outil supérieur et son support pour une presse plieuse et méthode de fixation de l'outil supérieur
WO2004052570A1 (fr) 2002-12-12 2004-06-24 Aoki, Eisuke Dispositif de support de cadre superieur pour presse-plieuse
EP1762310A1 (fr) * 2005-09-13 2007-03-14 Rolleri S.p.A Dispositif de couplage et découplage rapide pour un outil supérieur d'une presse plieuse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105636715A (zh) * 2013-09-13 2016-06-01 罗莱里股份公司 用于在压弯机中锁定工具的锁定设备
US9808846B2 (en) 2013-09-13 2017-11-07 Rolleri S.P.A. Locking device for locking tools in a press brake
CN109789472A (zh) * 2016-09-26 2019-05-21 通快机床两合公司 用于加工板状工件的工具和机床以及方法
IT202200015465A1 (it) 2022-07-22 2024-01-22 Rolleri S P A Dispositivo per il bloccaggio di utensili per una pressa piegatrice

Also Published As

Publication number Publication date
ITMI20100110A1 (it) 2011-07-29
IT1397907B1 (it) 2013-02-04

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