EP2581145A1 - Biegestempel- und Matrizensatz - Google Patents

Biegestempel- und Matrizensatz Download PDF

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Publication number
EP2581145A1
EP2581145A1 EP12188020.7A EP12188020A EP2581145A1 EP 2581145 A1 EP2581145 A1 EP 2581145A1 EP 12188020 A EP12188020 A EP 12188020A EP 2581145 A1 EP2581145 A1 EP 2581145A1
Authority
EP
European Patent Office
Prior art keywords
die
punch
rocker
work piece
channel
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.)
Withdrawn
Application number
EP12188020.7A
Other languages
English (en)
French (fr)
Inventor
Wesley L. Ovre
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.)
Altimate Medical Inc
Original Assignee
Invacare Corp
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 Invacare Corp filed Critical Invacare Corp
Publication of EP2581145A1 publication Critical patent/EP2581145A1/de
Withdrawn legal-status Critical Current

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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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/04—Movable or exchangeable mountings for tools
    • B21D37/06—Pivotally-arranged tools, e.g. disengageable
    • 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
    • B21D5/0263—Die with two oscillating halves
    • 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
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments

Definitions

  • the present invention relates to a punch and die set. It finds particular application in conjunction with a punch and die set having a rocker element and will be described with particular reference thereto. It will be appreciated, however, that the invention is also amenable to other applications.
  • Bending is a manufacturing process that produces a shape along an axis in a ductile material such as metal.
  • a punch and die set is commonly used for bending metal.
  • a work piece e.g., metal sheet
  • a punch and die set is commonly used for bending metal.
  • a work piece e.g., metal sheet
  • a punch presses the work piece into the die set to form a shape. Residual stresses of the bending process may cause the work piece to spring back towards its original position. Therefore, it is not uncommon to over-bend the work piece to achieve a desired bend angle.
  • the present invention provides a new and improved apparatus and method which addresses the above-referenced problems.
  • a punch and die set is contemplated to include a die having two arms. The two arms and a bottom of the die define a die channel. A punch is sized to be received in the die channel. A rocker element is movably secured to the die. A reduced frictional element is movably secured to the rocker element. The rocker element is movably secured to the die so that the rocker element pivots relative to the die around a pivot point between a centerline of the die channel and at or inside a first of the arms.
  • FIGURE 1 illustrates a schematic representation of a punch and die set in a first position in accordance with one embodiment of an apparatus illustrating principles of the present invention
  • FIGURE 2 illustrates a schematic representation of the punch and die set in a second position in accordance with one embodiment of an apparatus illustrating principles of the present invention
  • FIGURE 3 is illustrates a work piece bent by the punch and die set.
  • FIGURE 1 illustrates a simplified component diagram of an exemplary punch and die set 10 in a rest position in accordance with one embodiment of the present invention.
  • FIGURE 2 illustrates the simplified component diagram of the exemplary punch and die set 10 in an actuated position in accordance with one embodiment of the present invention.
  • the punch and die set 10 includes an outer die 12 including two (2) arms 14, 16, respectively, and a bottom 20.
  • the first arm 14 includes a first inner wall 22, and the second arm 16 includes a second inner wall 24.
  • the arms 14, 16 and bottom 20 define an outer die channel 26.
  • the outer die channel 26 defines a die entry 30 between the first and second inner walls 22, 24.
  • a first rocker element 32 is movably secured to the first 14 arm (e.g., the inner wall 22 of the first arm 14).
  • a second rocker element 34 is movably secured to the second 16 arm (e.g., the inner wall 24 of the second arm 16).
  • the arms 14, 16 and the rocker elements 32, 34, which are movably secured to the arms 14, 16, define a rocker channel 36, which is substantially symmetrical around a first axis 40 defined vertically along a centerline of the outer die channel 26.
  • the outer die channel 26 houses the rocker elements 32, 34 and is sized to accommodate a desired punch radius, plus the rocker elements 32, 34, and an allowance for the desired thickness range of a work piece 42 to be bent in the die 12. Additional clearance may be added to facilitate ease of removal of the finished part upon completion of the bend and the subsequent springback of the work piece 42.
  • a first spring mechanism 44 is used to movably attach the first rocker element 32 to the first arm 14.
  • a second spring mechanism 46 is used to movably attach the second rocker element 34 to the first arm 16.
  • a punch 50 is sized to be received in the channel 26.
  • the punch 50 is illustrated in a retracted position in FIGURE 1 .
  • the punch 50 is illustrated in an extended position in FIGURE 2 .
  • the punch 50 is moved between the retracted ( FIGURE 1 ) and extended ( FIGURE 2 ) positions via a stem 52.
  • the stem 52 is mechanically moved between the retracted position ( FIGURE 1 ) and the extended position ( FIGURE 2 ) via a machine (e.g., a hydraulic machine) (not illustrated).
  • the punch 50 is illustrated as round, it is to be understood other shapes for the punch 50 are contemplated to accommodate fabrications of different degrees of complexity.
  • the punch may be shaped for partial closure forms, C-forms, return bends, etc.
  • a first reduced frictional element 54 is movably secured to the first rocker element 32.
  • a second reduced frictional element 56 is movably secured to the second rocker element 34.
  • the first and second reduced frictional elements 54, 56 are rollers or bearings (e.g., roller bearings) that are secured to the first and second rocker elements 32, 34, respectively.
  • the first and second reduced frictional elements 54, 56 are movably secured to the first and second rocker elements 32, 34 by first and second pins 60, 62, respectively.
  • the first pin 60 defines a first axis 64 of the first reduced frictional element 54.
  • the second pin 62 defines a second axis 66 of the second reduced frictional element 56.
  • the outer die 12 includes first and second pivot protrusions 70, 72 (ledges), respectively.
  • the first pivot protrusion 70 is in the channel 26 between the first axis 40 defined vertically along the centerline of the channel 26 and a second axis 74, which is parallel to the first axis 40, defined at or inside the first inner wall 22 of the first arm 14.
  • the second pivot protrusion 70 is in the channel 26 between the first axis 40 and a third axis 76, which is parallel to the first axis 40, defined at or inside the second inner wall 24 of the second arm 16.
  • the second and third axes 74, 76 and the first and second pivot protrusions 70, 72 are inside the entry 30 of the die 12.
  • the first pivot protrusion 70 is positioned so that the second axis 74 is at the first axis 64 of the first reduced frictional element 54, or between the first axis 64 of the first reduced frictional element 54 and the first axis 40 (e.g., the centerline of the channel 26).
  • the second pivot protrusion 70 is positioned so that the third axis 74 is at the second axis 66 of the second reduced frictional element 56, or between the second axis 66 of the second reduced frictional element 56 and the first axis 40 (e.g., the centerline of the channel 26).
  • first and second pivot protrusions 70, 72 are substantially equally spaced from the first axis 40 along a surface of the channel 26. As discussed in more detail below, the substantially equal spacing of the first and second pivot protrusions 70, 72 from the first axis 40 results in the work piece 42 being bent in a substantially symmetrical manner.
  • the first rocker element 32 includes a first pivot recess 80 that cooperatively mates with the first pivot protrusion 70 of the outer die 12.
  • a first pivot point 82 is based on (defined at) the first pivot protrusion 70.
  • the second rocker element 34 includes a second pivot recess 84 that cooperatively mates with the second pivot protrusion 72 of the outer die 12.
  • a second pivot point 86 is based on (defined at) the second pivot protrusion 72.
  • the work piece 42 (e.g., a metal sheet) to be bent is positioned across a top of the die 12 so that the work piece 42 passes over the die entry 30.
  • the punch 50 is positioned over the work piece 42.
  • the punch 50 is moved downward from the position illustrated in FIGURE 1 toward the position illustrated in FIGURE 2 .
  • the punch 50 contacts the work piece 42.
  • the work piece 42 contacts the first and second reduced frictional elements 54, 56 and begins to bend.
  • the first and second reduced frictional elements 54, 56 reduce friction against the work piece 42 as the work piece 42 bends while being pushed into the rocker channel 36.
  • first and second pivot protrusions 70, 72 are positioned as discussed above to reduce a tendency of the first and second rocker elements 32, 34 to collapse inward as the punch 50 begins to push the work piece 42 downward into the rocker channel 36. Reducing this tendency of the first and second rocker elements 32, 34 to collapse inward reduces any spikes in press tonnage or absolute interference as the punch 50 and work piece 42 enter the rocker channel 36.
  • the symmetry of the rocker elements 32, 34 around the centerline first axis 40 also helps to equally transfer bending loads to the pivot points 82, 86.
  • first and second pivot protrusions 70, 72 are substantially squared-off ledges, which reduce and/or eliminate undesirable spreading movement of the rocker elements 32, 34 as the work piece 42 is pushed into the rocker channel 36.
  • the positions of the first and second pivot protrusions 70, 72 also helps reduce and/or eliminate the undesirable spreading movement of the rocker elements 32, 34 as the work piece 42 is pushed into the rocker channel 36.
  • first and second reduced frictional elements 54, 56 reduce sliding friction in which the work piece 42 must slide under pressure in the rocker channel 36. Therefore, the first and second reduced frictional elements 54, 56 reduce the force required to push the work piece 42 into the rocker channel 36 and reduce and/or eliminate galling and other friction related cosmetic issues.
  • the first and second reduced frictional elements 54, 56 are sized to calculated loads that will be experienced in the bending process.
  • the gauge of the work piece 42 is based on the size of the die entry 30 and the radius formed. Therefore, multiple gauge thicknesses of a work piece 42 may be used in the same die 12.
  • the pivoting action of the first and second rocker elements 32, 34 causes the work piece 42 to bend more than 90° at the first bend 90 and also bend more than 90° at the second bend 92 when the punch 50 is fully inserted into the rocker channel 36 to create the 180° U-shaped bend. Since the top portions of the first and second rockers 32, 34 (e.g., the ends of the first and second rockers 32, 34 including the first and second reduced frictional elements 54, 56) pivot inward toward the centerline of the channel 26, the stem 52 of the punch 50 is sized to be narrow enough to fit between the first and second reduced frictional elements 54, 56 when the first and second rockers 32, 34 pivot inward.
  • the over-bending (bending more than 90° at the first bend 90 and also bending more than 90° at the second bend 92) is desired to compensate for the work piece 42 tending to return (springback) to the original shape (e.g., before the work piece 42 was bent) after the punch 50 is removed from the rocker channel 36 and after the work piece 42 is removed from the punch 50.
  • the springback results in the work piece 42 having the desired bend of about 180° forming a U-shaped channel.
  • the dotted lines 42a in FIGURE 3 illustrate the over-bend in the work piece 42 before the springback.
  • the distance the punch 50 travels into the rocker channel 36 may be used to control the degree of resulting over-bend. Because of the natural range of movement that may be designed into the rocker element, and the degree of bend being controlled by how deep the punch 50 enters the rocker channel 36, less tight clearances are required than in the prior art between the punch 50 and any sidewall elements of either the rocker channel 36 or the rocker elements 32, 34.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP12188020.7A 2011-10-10 2012-10-10 Biegestempel- und Matrizensatz Withdrawn EP2581145A1 (de)

Applications Claiming Priority (1)

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US201161545223P 2011-10-10 2011-10-10

Publications (1)

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EP2581145A1 true EP2581145A1 (de) 2013-04-17

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EP12188020.7A Withdrawn EP2581145A1 (de) 2011-10-10 2012-10-10 Biegestempel- und Matrizensatz

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US (1) US20130111967A1 (de)
EP (1) EP2581145A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855337A (zh) * 2016-05-30 2016-08-17 河南宝润机械有限公司 弓钢成型机
CN107175269A (zh) * 2017-07-28 2017-09-19 芜湖富创新型建材有限公司 一种用于加气块装载箱壁制造用的自动弯板机
CN108213126A (zh) * 2018-03-21 2018-06-29 岳德全 一种高稳定性工件弯曲装置
CN110227744A (zh) * 2019-06-25 2019-09-13 浙江盛达铁塔有限公司 一种圆滚式折弯平台结构
CN111496087A (zh) * 2020-04-29 2020-08-07 芜湖等莱智能科技有限公司 一种基于u型抱箍组件的加工磨具
WO2021109172A1 (zh) * 2019-12-05 2021-06-10 安徽绩溪徽山链传动有限公司 自回程重型无痕折弯模

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105562475A (zh) * 2016-02-26 2016-05-11 如皋市福锴金属制品有限公司 一种钢板折弯冲压装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209576A (en) * 1961-02-03 1965-10-05 Promecan Sisson Lehmann Die arrangement for a press
US5295385A (en) * 1992-04-23 1994-03-22 Murai Industrial Co., Ltd. Bending apparatus
EP1066893A1 (de) * 1998-12-28 2001-01-10 Yuugenkaisha Taigaa Koosan Biegevorrichtung von metalplatte
EP1224985A1 (de) * 2001-01-19 2002-07-24 Siderpress S.p.A. Biegemaschine, insbesondere zum Biegen von Stahlblechen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443596A (en) * 1945-09-21 1948-06-22 James E Cahill Reciprocating bender with pivoted side shapers
US4141235A (en) * 1976-09-18 1979-02-27 Masamitsu Ishihara Hydraulic bending machine
US4660403A (en) * 1985-12-19 1987-04-28 Weldex, Inc. Die assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209576A (en) * 1961-02-03 1965-10-05 Promecan Sisson Lehmann Die arrangement for a press
US5295385A (en) * 1992-04-23 1994-03-22 Murai Industrial Co., Ltd. Bending apparatus
EP1066893A1 (de) * 1998-12-28 2001-01-10 Yuugenkaisha Taigaa Koosan Biegevorrichtung von metalplatte
EP1224985A1 (de) * 2001-01-19 2002-07-24 Siderpress S.p.A. Biegemaschine, insbesondere zum Biegen von Stahlblechen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855337A (zh) * 2016-05-30 2016-08-17 河南宝润机械有限公司 弓钢成型机
CN107175269A (zh) * 2017-07-28 2017-09-19 芜湖富创新型建材有限公司 一种用于加气块装载箱壁制造用的自动弯板机
CN108213126A (zh) * 2018-03-21 2018-06-29 岳德全 一种高稳定性工件弯曲装置
CN110227744A (zh) * 2019-06-25 2019-09-13 浙江盛达铁塔有限公司 一种圆滚式折弯平台结构
WO2021109172A1 (zh) * 2019-12-05 2021-06-10 安徽绩溪徽山链传动有限公司 自回程重型无痕折弯模
CN111496087A (zh) * 2020-04-29 2020-08-07 芜湖等莱智能科技有限公司 一种基于u型抱箍组件的加工磨具

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