EP1918037A1 - Machine à courber avec mécanisme de réglage de la longueur d'outil de pliage - Google Patents

Machine à courber avec mécanisme de réglage de la longueur d'outil de pliage Download PDF

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Publication number
EP1918037A1
EP1918037A1 EP07019369A EP07019369A EP1918037A1 EP 1918037 A1 EP1918037 A1 EP 1918037A1 EP 07019369 A EP07019369 A EP 07019369A EP 07019369 A EP07019369 A EP 07019369A EP 1918037 A1 EP1918037 A1 EP 1918037A1
Authority
EP
European Patent Office
Prior art keywords
bending
bending tool
tools
tool
traveling
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
EP07019369A
Other languages
German (de)
English (en)
Other versions
EP1918037B1 (fr
Inventor
Shunitsu Ito
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.)
Murata Machinery Ltd
Original Assignee
Murata Machinery Ltd
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 Murata Machinery Ltd filed Critical Murata Machinery Ltd
Publication of EP1918037A1 publication Critical patent/EP1918037A1/fr
Application granted granted Critical
Publication of EP1918037B1 publication Critical patent/EP1918037B1/fr
Not-in-force 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
    • 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
    • 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
    • B21D37/14—Particular arrangements for handling and holding in place complete dies
    • B21D37/145—Die storage magazines
    • 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
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work

Definitions

  • the present invention relates to a bending machine with a bending tool length adjusting mechanism which carries out bending processing of a plate material, for example, bending processing of a bending piece provided around an inner window opening in a door panel.
  • a door panel 91 made of a sheet metal has a inner window opening 92 for natural illumination or the like and a bending piece 93 provided around the periphery of the opening 92 to allow a glass plate to be fitted into the opening. Bending processing of the bending piece 93 is carried out by wipe-bending processing in which the periphery of the opening 92 in the door panel 91 is wipe-bent.
  • the vertical and horizontal size of the opening 92 varies depending on the type of the door panel 91, and a dedicated bending machine is thus normally used which changes a bending tool depending on the size and type of the opening 92.
  • the conventional bending machines with the bending tool length adjusting mechanisms all adjust the length of the bending tools inside the bending machine main body. This limits an adjustment form.
  • a bending piece 93 is separated into fragments corresponding to respective peripheral sides. Bending processing of the bending piece 93 can be achieved by any of the conventional bending machines with the bending tool length adjusting mechanisms.
  • the bending piece 93 may need to be continuous along the four sides of the opening.
  • the corner portion between the adjacent sides of the opening 92 needs to be processed into a corner rounded portion 93a that allows the bending piece 93 to be continuously curved.
  • the inventor envisaged a method for forming such a continuous bending piece 93 in which the corner portions of the opening 92 are subjected to bending processing and thus formed into the corner rounded portions 93a and in which the sides of the opening 92 are then subjected to bending processing to form a bending piece 93 that is continuous along the four sides of the opening as shown in Figure 15.
  • the conventional bending machines with the bending tool length adjusting mechanisms increase or reduce the number of bending tools from an end of the bending tool group.
  • the bending piece 93 having the corner rounded potions 93a as shown in Figure 15 cannot be subjected bending processing using a bending tool group with square opposite ends as described above.
  • An object of the present invention is to provide a bending machine with a bending tool length adjusting mechanism which provides a certain degree of freedom for the form of length adjustment of bending tools.
  • Another object of the present invention is to enable the opposite ends of a bending tool group to be rounded even with a variation in the length of the bending tool group, allowing a bending piece to be processed so that an opening has a corner rounded portion in each corner portion.
  • Yet another object of the present invention is to allow any number of the bending tools to be smoothly placed on a traveling member that travels with the bending tool group placed thereon.
  • the present invention provides a bending machine with a bending tool length adjusting mechanism, the bending machine having a bending tool group comprising a plurality of bending tools arranged in a line and a press driving mechanism that elevates and lowers a plate material relative to the bending tool group, the bending tool group carrying out bending processing on the plate material, the bending machine comprising a bending tool length adjusting mechanism that adjusts the length of the bending tool group in a bending tool arranging direction.
  • the bending tool length adjusting mechanism comprises a traveling member on which the bending tool group is placed and which moves into and out of a bending machine main body in the bend i ng too arranging d i rec t i on, the bend i ng mach i ne ma i n body comprising the press driving mechanism, a pair of abutting members which is provided on the traveling member and against which opposite ends of the bending tool group on the travel ing member are abutted, an abutting member moving mechanism that moves one or both of the abutting members in the bending tool arranging direction with respect to the traveling member, a bending tool storage mount which is provided outside the bending machine main body along a traveling route for the traveling member and on which surplus bending tools not included in the bending tool group are placed in juxtaposition along the traveling route, an unloading pusher mechanism that pushes out the bending tools on the traveling member onto the bending tool storage mount, and a placing pusher mechanism that places any number of the bending tools on the
  • the bending tool length adjusting mechanism allows the traveling member with the bending tool group placed thereon to move into and out of the bending machine main body, and the bending tool length adjusting mechanism thus selects, outside the bending machine main body, a bending tool to be loaded onto the traveling member from the bending tool group.
  • the traveling member has the pair of abutting members provided thereon, and against which the opposite ends of the bending tool group are abutted for positioning and the abutting member moving mechanism provided thereon to move the abutting members. This enables the bending tool group placed on the traveling member and having one of various possible lengths to be fixed using the abutting members. This provides a certain degree of freedom for the form of length adjustment of the bending tools.
  • the number of bending tools located in the middle of the bending tool group can be changed with the bending tools at the opposite ends of the bending tool group remaining unchanged.
  • the number of bending tools located in the middle of the bending tool group can be changed by the following configuration.
  • the bending tool group on the traveling member may have end-only bending tools positioned at opposite ends of the bending tool group.
  • An end of an arrangement of the bending tool group at a tip surface of the end-only bending tool may constitute a curved surface portion exhibiting a curved line in a cross section in the bending tool arranging direction.
  • the abutting member moving mechanism may be able to move the end-only bending tool located farther from the bending machine main body, to a position where the end-only bending tool lies away from an end of a maximum arranging length of the bending tools on the bending tool storage mount.
  • the placing pusher mechanism may comprise a plurality of push rods arranged in juxtaposition along bending tool arranging positions on the bending tool storage mount, and at a position opposite to the traveling route, an endless pivoting member located opposite the traveling route so that a pivoting route for the endless pivoting member extends along an arrangement of the push rods, a pivoting member moving forward and backward mechanism that moves the endless pivoting member forward and backward with respect to the push rods, and a plurality of selective pushing members which are provided in a part of the endless pivoting member in a length direction thereof and in juxtaposition in the length direction, the selective pushing members pushing the push rods as a result of movement of the endless pivoting member carried out by the pivoting member moving forward and backward mechanism.
  • the endless pivoting member pivots to allow the adjustment of the length of the selective pushing member along the bending tool arranging position on the bending tool storage mount. This allows those of the bending tools on the bending tool storage mount the number of which corresponds to the adjusted length, to be placed on the traveling member. Thus, the length of the bending tool group on the traveling member can be smoothly adjusted.
  • the placing pusher mechanism comprises the plurality of push rods arranged in juxtaposition along the bending tool arranging positions on the bending tool storage mount and at a position opposite to the traveling route, the endless pivoting member located opposite the traveling route so that the pivoting route for the endless pivoting member extends along the arrangement of the push rods, the pivoting member moving forward and backward mechanism that moves the endless pivoting member forward and backward with respect to the push rods, and the plurality of selective pushing members which are provided in the part of the endless pivoting member in the length direction thereof and in juxtaposition in the length direction, the selective pushing members pushing the push rods as a result of movement of the endless pivoting member carried out by the pivoting member moving forward and backward mechanism, any number of the bending tools can be smoothly placed on the traveling member traveling with the bending tool group placed thereon.
  • a bending machine with a bending tool length adjusting mechanism comprises a bending machine main body 1 and the bending tool length adjusting mechanism 2.
  • the bending machine main body 1 has a bending tool group 3A composed of a plurality of bending tools 3 arranged in a line, and a press driving mechanism 6 (Figure 2) that elevates and lowers a plate material W with respect to the bending tool group 3A.
  • the bending machine main body 1 thus uses the bending tool group 3A to carry out wipe-bending processing on the plate material W.
  • the press driving mechanism 6 comprises a ram 7 installed on a press frame 8 via a guide 9 so as to be able to elevate and lower freely and a driving mechanism (not shown in the drawings) that elevates and lowers the ram 7.
  • the lower tool block 11 has a built-in cushion pad 14 that corrects bending strain in the direction of a fold line, with the lower tool 5 installed on the cushion pad 14.
  • the cushion pad 14 is fitted in a fluid pressure chamber 15 provided in the lower tool block 11.
  • the cushion pad 14 can be elevated and lowered by an operating fluid such as oil or air which is fed into and discharged from the fluid pressure chamber 15 through a channel 16.
  • the bending machine main body 1 elevates and lowers the ram 7 to allow the upper tools 4 to press the plate material W located on the lower tool 5 as shown in Figure 3, against the lower tool 5 as shown in Figure 4A.
  • the plate material W sandwiched between the upper tools 4 and the lower tool 5 is further lowered against the cushion pad 14 by the ram 7 as shown in Figure 4B.
  • the plate material W is lowered with respect to the lower tool group 3A to fold an edge of the plate material W which projects from the upper tools 4, between the bending tool group 3A and the upper tools 4, thus forming a bending piece Wa. That is, wipe-bending is carried out.
  • the unloading pusher mechanism 26 is composed of a plate-like pusher 26a that moves forward and backward freely to push out the bending tools 3 on the traveling member 21 onto the bending tool storage mount 25, and a pusher moving forward and backward driving source 26b such as a plurality of hydraulic cylinders which moves the pusher 26a forward and backward.
  • the pusher 26a has a length covering the entire length of the bending tool storage mount 25, and the pusher 26a is supported on the fixed base 28 by a guide member (not shown in the drawings) so as to move forward and backward freely.
  • the placing pusher mechanism 27 has a plurality of push rods 41 prov i ded along bending tool arranging positions on the bending tool storage mount 25 at a position opposite to the traveling route for the traveling member 21, an endless pivoting member 42 located opposite side the traveling route so that a pivoting route for the endless pivoting member 42 extends along the arrangement of the push rods 41, and a pivoting member moving forward and backward mechanism 43 that moves the endless pivoting member 42 forward and backward with respect to the push rods 41.
  • the push rods 41 are fitted into respective guide holes 25bb formed in the regulating plate 25b on the bending tool storage mount 25 so as to move forward and backward freely, and a spring member 44 such as a coil spring is provided around the outer periphery of each push rod 4] to urge the push rod 41 to move backward with respect to the bending tool 3.
  • a spring member 44 such as a coil spring is provided around the outer periphery of each push rod 4] to urge the push rod 41 to move backward with respect to the bending tool 3.
  • the pivoting member moving forward and backward mechanism 43 is composed of the moving forward and backward mount 45 with the endless pivoting member 42 installed thereon and a moving forward and backward driving source 50 such as a plurality of hydraulic cylinders which moves the moving forward and backward mount 45 forward and backward.
  • the moving forward and backward mount 45 is installed on the fixed base 28 via a guide member (not shown in the drawings).
  • the traveling member 21 is stopped at a position where a predetermined gap (d) (for example, several millimeters) is created between the position of the leading one of the bending tools 3 in the middle of the bending tool group 3A, that is, the bending tool 3 adjacent to the end-only bending tool 3 2 , and the position of one of the bending tools 3 arranged on the bending tool storage mount 25 which is closest to the bending machine main body 1.
  • This stop position is controlled by the traveling member position control means 59. Always fixing the stop position of the traveling member 21 allows the traveling member 21 to be stopped at the position involving the predetermined gap (d).
  • the gap (d) remains fixed because the only difference is whether the bending tools 3 are placed on the traveling member 21 to constitute the bending tool group 3A or arranged on the bending tool storage mount 25.
  • the rod-less cylinder 38 of the abutting member moving mechanism 24 cooperates with the moving forward and backward member 39 in moving the movable-side abutting member 23 to a position where the end-only bending tool 3 2 lies away from the bending tool storage mount 25 as shown in Figure 9.
  • This stop position of the moving forward and backward member 39 is a position where the end-only bending tool 3 2 lines next to the movable storage mount 54 of the end-only bending tool changing mechanism 53 and to the vicinity of the pusher 26a of the unloading pusher mechanism 26.
  • the pusher 26a of the unloading pusher mechanism 26 moves forward to place all the bending tools 3 on the traveling member 21 except the end-only bending tools 3 1 , 3 2 onto the bending tool storage mount 25 ( Figure 10).
  • the gap (d) avoids the possible interference between the bending tools 3 unloaded from the traveling member 21 and the bending tools 3 on the bending : tool storage tool 25.
  • An end of the pusher 26a which is closer to the bending machine main body 1 is located at a position such that the end does not interfere with the abutting member 22.
  • the gap (d) remains.
  • the regulating pushing mechanism 51 composed of a cylinder device, pushes the arrangement of the bending tools 3 on the bending tool storage mount 25 from one end of the arrangement to eliminate the gap (d).
  • the placing pusher mechanism 27 pivots the endless pivoting member 42 so that the length of the selective pushing members 48 along the traveling member traveling route corresponds to the arranging width of the bending tools 3 required for the length of the next bending tool group 3A.
  • the endless pivoting member 42 as well as the moving forward and backward mount 45 are moved toward the traveling member 21 side by the moving forward and backward driving source 50 to allow the selective pushing members 48 to push those of the plurality of push rods 41 arranged in juxtaposition the positions of which correspond to the positions of the selective pushing members 48.
  • a required number of the bending tools 3 arranged on the bending tool storage mount 25 are placed on the traveling member 21.
  • the rod-less cylinder 38 of the abutting member moving mechanism 24 cooperates with the moving forward and backward member 39 in moving the movable-side abutting member 23 toward the bending machine main body 1 to press the movable-side end-only bending tool 3 2 against the arrangement of the bending tools 3 placed on the traveling member 21.
  • This state is shown in Figure 12. After changing the length of the bending tool group 3A is thus completed, the traveling member 21 is allowed to move into the bending machine main body 1 and used for bending processing.
  • Figure 13 shows an operation of changing the two movable-side end-only bending tools 3 21 , 3 22 .
  • Figure 13A shows that the traveling member 21 is moved out of the bending machine main body 1 and that the end-only bending tool 3 2 is moved together with the movable-side abutting member 23 as described above with reference to Figure 8 and Figure 9.
  • the pusher 26a of the unloading pusher mechanism 26 moves forward to place the bending tools 3 onto the bending tool storage mount 25.
  • the end-only bending tool 3 21 on the traveling member 21 is placed onto the movable storage mount 54 by the pusher 26a ( Figure 13B).
  • the movable storage mount 54 is moved by the movable storage mount moving forward and backward mechanism 56 so that the end-only bending tool 3 22 , which is to be next placed onto the movable storage mount 54, moves to the position corresponding to the end tool pusher mechanism 55 ( Figure 13D). Subsequently, the end-only bending tool 3 22 on the movable storage mount 54 is moved onto the traveling member 21 by the end tool pusher mechanism 55 ( Figure 13E).
  • the engaged portion 3b of each of the end-only bending tools 3 21 , 3 22 and the engaging portion 23b of the movable-side abutting member 23 can be freely engaged with and disengaged from each other in a direction orthogonal to the traveling member traveling direction. Consequently, the pusher 26a and the end tool pusher mechanism 55 perform an operation of pushing the end-only bending tools 3 21 , 3 22 for engagement or disengagement.
  • the bending machine with the bending tool length adjusting mechanism configured as described above thus provides a certain degree of freedom for the form of length adjustment of the bending tools 3.
  • the bending tool group 3A has the end-only bending tools 3 1 . 3 2 , positioned at the opposite ends thereof.
  • the end of the arrangement of the bending tool group at the tip surface of each of the end-only bending tools 3 1 , 3 2 constitutes the curved surface portion 3a exhibiting a curved line in a cross section in the bending tool arranging direction. Consequently, the opposite ends of the bending tool group 3A can be rounded even with a variation in the length of the bending tool group 3A.
  • the abutting member moving mechanism 24 is able to move the end-only bending tool 32 located farther from the bending machine main body 1, to the position where the end-only bending tool lies away from the end of the maximum arranging length of the bending tools 3 on the bending tool storage mount 25. This allows the middle bending tools 3 to be smoothly changed without posing any problem such as interference, while using the end-only bending tool 3 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP20070019369 2006-11-02 2007-10-02 Machine à courber avec mécanisme de réglage de la longueur d'outil de pliage Not-in-force EP1918037B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006298783A JP4899802B2 (ja) 2006-11-02 2006-11-02 曲げ型長さ調整機構付き曲げ機械

Publications (2)

Publication Number Publication Date
EP1918037A1 true EP1918037A1 (fr) 2008-05-07
EP1918037B1 EP1918037B1 (fr) 2009-07-15

Family

ID=39111286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070019369 Not-in-force EP1918037B1 (fr) 2006-11-02 2007-10-02 Machine à courber avec mécanisme de réglage de la longueur d'outil de pliage

Country Status (4)

Country Link
EP (1) EP1918037B1 (fr)
JP (1) JP4899802B2 (fr)
CN (1) CN101172291B (fr)
DE (1) DE602007001569D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113695431A (zh) * 2021-08-25 2021-11-26 安徽不凡建筑科技有限公司 一种轻钢建筑用钢材折弯设备及折弯方法
CN113811403A (zh) * 2019-05-10 2021-12-17 特鲁普机械奥地利有限公司及两合公司 用于优化折弯机的折弯工具组合的方法和系统

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Publication number Priority date Publication date Assignee Title
KR101189712B1 (ko) 2008-04-24 2012-10-10 교세라 가부시키가이샤 휴대전자기기
CN101934319B (zh) * 2010-07-23 2012-07-25 湖北三环锻压设备有限公司 重载型内力平衡式自动变距折弯下模
CN104851943A (zh) * 2015-04-14 2015-08-19 四川和鼎环保工程有限责任公司 一种太阳能电池用金属边折边机
CN108080448B (zh) * 2018-01-03 2020-12-01 海安县金威机床有限公司 一种可选择折边长度和折边位置的折边机
JP7002364B2 (ja) * 2018-03-01 2022-01-20 三桜工業株式会社 曲げ成形型
CN109465316B (zh) * 2018-08-27 2020-04-17 宁波欣达（集团）有限公司 智能集成设备及应用智能集成设备的折弯方法
CN111992598A (zh) * 2020-07-20 2020-11-27 上海蓝天房屋装饰工程有限公司 一种多边形板块的弯弧装置及弯弧方法

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JPS57149026A (en) * 1981-03-11 1982-09-14 Maru Kikai Kogyo Kk Folding die
EP0105091A2 (fr) * 1982-09-08 1984-04-11 Maru Kikai Kogyo Co., Inc. Dispositif pour modifier la longueur de l'outil dans une machine à plier les panneaux
JPS63207419A (ja) * 1987-02-20 1988-08-26 Amada Co Ltd 折曲げ機
EP0308363A1 (fr) * 1987-09-18 1989-03-22 Bellheimer Metallwerk GmbH Rayonnage circulant
JPH05212446A (ja) * 1992-02-07 1993-08-24 Murata Mach Ltd 板材折曲機の金型交換装置
EP0577068A1 (fr) * 1992-06-29 1994-01-05 Goiti, S.Coop.Ltda. Machine de pliage
JPH10291032A (ja) * 1997-04-16 1998-11-04 Maru Kikai Kogyo Kk ドアパネルの中窓加工装置

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JPH0694050B2 (ja) * 1986-03-13 1994-11-24 株式会社アマダ 折曲げ加工機の金型自動交換装置
JPS6457922A (en) * 1987-08-28 1989-03-06 Maru Kikai Kogyo Center window working device for door panel
JPH10175019A (ja) * 1996-12-18 1998-06-30 Maru Kikai Kogyo Kk ドアパネルの中窓加工装置
CN2788926Y (zh) * 2005-04-27 2006-06-21 江苏国力锻压机床有限公司 一种双机联动折弯机
JP2008114243A (ja) * 2006-11-02 2008-05-22 Murata Mach Ltd 曲げ機械の曲げ作業指示装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57149026A (en) * 1981-03-11 1982-09-14 Maru Kikai Kogyo Kk Folding die
EP0105091A2 (fr) * 1982-09-08 1984-04-11 Maru Kikai Kogyo Co., Inc. Dispositif pour modifier la longueur de l'outil dans une machine à plier les panneaux
JPS63207419A (ja) * 1987-02-20 1988-08-26 Amada Co Ltd 折曲げ機
EP0308363A1 (fr) * 1987-09-18 1989-03-22 Bellheimer Metallwerk GmbH Rayonnage circulant
JPH05212446A (ja) * 1992-02-07 1993-08-24 Murata Mach Ltd 板材折曲機の金型交換装置
EP0577068A1 (fr) * 1992-06-29 1994-01-05 Goiti, S.Coop.Ltda. Machine de pliage
JPH10291032A (ja) * 1997-04-16 1998-11-04 Maru Kikai Kogyo Kk ドアパネルの中窓加工装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113811403A (zh) * 2019-05-10 2021-12-17 特鲁普机械奥地利有限公司及两合公司 用于优化折弯机的折弯工具组合的方法和系统
CN113811403B (zh) * 2019-05-10 2023-12-12 特鲁普机械奥地利有限公司及两合公司 用于优化折弯机的折弯工具组合的方法和系统
CN113695431A (zh) * 2021-08-25 2021-11-26 安徽不凡建筑科技有限公司 一种轻钢建筑用钢材折弯设备及折弯方法

Also Published As

Publication number Publication date
CN101172291A (zh) 2008-05-07
DE602007001569D1 (de) 2009-08-27
JP4899802B2 (ja) 2012-03-21
EP1918037B1 (fr) 2009-07-15
CN101172291B (zh) 2011-01-19
JP2008114242A (ja) 2008-05-22

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