CA1179931A - Bending - Google Patents
BendingInfo
- Publication number
- CA1179931A CA1179931A CA000396013A CA396013A CA1179931A CA 1179931 A CA1179931 A CA 1179931A CA 000396013 A CA000396013 A CA 000396013A CA 396013 A CA396013 A CA 396013A CA 1179931 A CA1179931 A CA 1179931A
- Authority
- CA
- Canada
- Prior art keywords
- flanges
- elongate member
- bending
- bend
- section
- 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.)
- Expired
Links
- 238000005452 bending Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011324 bead Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
BENDING
Abstract of the Disclosure An apparatus for bending an elongate member comprises a pair of spaced parallel planar flanges which normally extend from a planar web to form a channel section. The apparatus includes a movable member shaped for close fitting engagement with the interior and exterior faces of each flange at least in a region of the elongate member in which a bend is to be formed. The movable member is articulated for movement of at least a first section relative to a second section to apply a bending force acting in the planes of the flanges to longitudinally spaced portions of the elongate member for relative displacement thereof to form at least one bend.
The movable member is maintained in a close fitting engagement with the flange faces during the displacement whereby the flanges in the region of the member are maintained in a planar position.
Abstract of the Disclosure An apparatus for bending an elongate member comprises a pair of spaced parallel planar flanges which normally extend from a planar web to form a channel section. The apparatus includes a movable member shaped for close fitting engagement with the interior and exterior faces of each flange at least in a region of the elongate member in which a bend is to be formed. The movable member is articulated for movement of at least a first section relative to a second section to apply a bending force acting in the planes of the flanges to longitudinally spaced portions of the elongate member for relative displacement thereof to form at least one bend.
The movable member is maintained in a close fitting engagement with the flange faces during the displacement whereby the flanges in the region of the member are maintained in a planar position.
Description
1~79~31 BENDING
DESCR~PTION
This invention relates to the bending of channel section members, for example in- the manufacture of vebicle chassis frames or other fabricated structures using sheet or plate metal members.
It is often reguired to form a bend or bends in a channel section lying in the plane of the flanges of the channel i.e. involving deformation of the flanges about an axis or axes normal to their planes. This involves stretching or compression of the flange material longitudinally of the member particularly in those parts of the flange which will form the maximum radius parts of the finished bend. Specifications of metal used may vary 80 that behaviour of the material, is, to some extent, unproductable. These problems have caused difficulty in bending cbannel sections satisfactorily as regards finished appearance and maintaining consistent dimensions. In particular bending has often resulted in 20 unsightlyand possibly weakening ripples or crin~ling of areas of tbe flanges in the regions of the bend or bends.
Tbe object of the invention is to provide a method of an appratus for bending channel section members which permits close control of the bending process and improved and consistent results, giving a finished workpiece wbich 1 1799~1 is of neat and uniform appearance and precisely dimensioned.
According to the invention there is provided apparatus for bending an elongate member comprising a pair of spaced parallel planar flanges extending normally from a planar web to form a channel section, said apparatus comprising interacting formations which are shaped for ad movable into close fitting engagement with the interior and exterior faces of each flange at least in a region of the member in which a bend is to be effected, said formations being articulated for movement of at least a first section relative to a second section to apply a bending force acting in the planes of the flanges to longitudinally spaced portions of the member for relative displacemeDt thereof to form at least one bend, said close fitting engagement of the flange faces being maintained during said displacement to ensure that the flanges in said region of the member remain planar.
The invention further resides in a method of forming a bend or bends in a channel section member by taking the steps of the process carried out by the apparatus above defined, and in a member processed, i.e. bent, using said apparatus and/or method.
Said bending may be simple, i.e. a single bend so that a first portion of the member i6 bent at an angle to a second portion, or compound i.e. forming more than one bend so that a first portion is angled or laterally offset with respect to another portion or portions e.g.
cranked or joggled, the offset being along a plane parallel to one or more of the remaining portions.
Thus in forming a joggle in which a centre straight portion of the member is to be laterally offset with respect to two end portions, the latter being on a commoD
axis, a total of four bends (two pairs in opposite directions) will be necessary and the apparatus may be adapted to form all these bends in a single step while maintaining the flanges planar in all the bend regions.
~ 179~31 The apparatus may further include provision for overbending to allow for spring back of portions of t~e material after the workpiece is released following bending.
One practical embodiment of the invention is now more particularly described with reference to the accompanying drawings wherein:
Figure 1 is a sectional plan view of operative parts of a bending press at the commencement of an operating cycle;
Figure 2 is a like view of the press with the psrts in tbe coacting position of the bending process;
Figure 3 is a diagram of a workpiece;
Figure 4 is a section on line 4-4 of Figure 1, and Figure 5 is a section on line 5-5 of Figure 2.
The example of the invention now to be described relates to the forming of side members of vehicle chassis frames, said members being pressed from heavy gauge metal sheet or plate to a channel cross section having a pair of spaced parallel flanges which are generally horizontal in tbe assembled chassis and a vertical web betwePn and normal to the flanges.
In tbe present example the member 9 is required to be finished to the shape indicated diagrammatically by the full lines of Figure 3 to include a double cranking or joggle so that a straight intermediate portion A is laterally offset with respect to straight end portioos B.
A straight channel section is first formed by conventional processes and is then bent to the final form by the metbod and in the apparatus now to be described.
Referring to Figures 1 and 2 the apparatus is based on a standard 400 ton horizontal hydraulic press comprising a main ram 10 carrying a main ram head 11 which coacts with a fixed platen 12 of the press.
As best seen in Figure 1 and 4, central portion of platen 12 has upper and lower parallel spaced guide blocks 13 defining a channel open towards head 11 and extending laterally of the press, said channel having a 179~3 width which closely fits the outer faces of the flanges of member 9.
Opposite end portions of said channel have respective fixed bolsters 14 mounted therein, outer faces of said bolsters being convex in plan longitudinally of the channel.
Between bolsters 14 the rear wall of said channel is cut away to contain a movable longitudinal counter-pressure member 15 which can be selectively advanced or retracted by means of a hydraulic counter-pressure ram 16 within platen 12.
Parts of platen 12 lying laterally beyond guide members 13 each include a respective hydraulic overbending ram 17awhose heads can be advanced or retracted in conjunction with corresponding overbending rams 17_ carried on the main ram head 11.
Head 11 incorporates a central projection 18 extending longitudinally and having a planar forward face whose length corresponds substantially with the length of counterpressure member 15 terminating in curved end faces.
Projection 18 will enter the channel between members 13 when head 11 is advanced and the vertical depth of the projection is such that it is a close fit between the flanges of the member.
Also carried on main head 11 is a pair of locating ram~ 19 having beads which can be selectively advanced or retracted relative to main head 11 in coacting relationship with bolsters 14 of platen 12, said heads also being a close fit between the member flanges.
The acting parts of the heads of rams 19 extend forwardly of vertically projecting lips l9a (see Figure S) which abut tbe outer faces of members 13 to define a fixed clearance between the end face of the ram head and the face of the corresponding bolster 14, said clearance closely accommodating the thickness of the web of member 9.
~ ~79~3 The operation of the press is as follows A straight length of member (which may be of uniform or non-uniform section throughout its length, e.g., the deptb and/or spacing of the flanges may change along the 5 lengtb or in regions thereof) is located in the channel between members 13 in the position indicated by broken lines in Figure 1 and with counter-pressure member 15 advanced in line with the foremost parts of the curved faces of bolsters 1~ so that the web is backed by these.
Main head 11 is advanced so that projection 18 enters between the flanges until it is pressing a centre portion of the web against counter-pressure member 15, back pressure being applied to ram 16 to tightly engage said portion of tbe web and keep it flat while main head 11 continues its advance.
At the same time tbe acting parts of the heads of locating rams 19 are also entered between the flanges, these rams being pressurised so that lips 19a are maintained in abutment with the outer faces of guide members 13 as referred to above. This maintains the flanges and web in alignment but permits the end portions B to slide longitudinally to the extent necessary to provide the shorter overall length needed to form the offset or joggle.
In this positions (as shown in Figure 2) the central portion of the member which is to be subjected to the double bending and, in particular, its flanges, are closely confined in all directions by the coacting faces of the platen and main bead assemblies including the guide members 13, the projection 18, and the heads of locating rams 19 so that no part of them can be displaced upwardly or downwardly out of their general parallel planes. Tbis confined condition is maintained throughout advance of the main ram head 11 to displace the centremost region of member 9 laterally against the counter-pressure exerted by member 15 to the exte~lt necessary to create the desired double bending or joggle thus no crinkling or rippliDg of the member flanges can ~ ~79g31 take place in the regions of the four bends necessary to create this shape.
The extent of displacement of the centre section can be selectively adjusted to allow for "spring-back" so that the final sbape, when released from the press, is within reguired tolerances even though the specification of the metal, in particular its yield strength, may vary.
The effect of tbe above bending process will tend to stress the material so that, wben released from the press, the outer end portions B will spring toward the positions indicated by broken lines at Bl in Figure 5.
In-built correction for this is provided by selective operation of tbe overbending rams 17a, 17b to apply or maintain pressure on and portions ~ during the press operation to deflect them sufficiently to compensate for this "spring-back" e.g. to displace them toward the position shown by dotted lines B2 or to compensate for any over-correction applied.
The operation of the invention provides a cranked or joggled channel section chassis side or other member to extremely close and consistent tolerances of high strength and durability and of good appearance. In particular the avoidance of crinkling or waves in the flanges at the bend regions considerably enhances the appearance, facilitates subsequent assembly as planar upper and lower faces are maintained for accurate mounting of components etc., and may improve the strength and resistance to flexure of the finished member.
Tbe confining of the flanges in the way above described, particularly in the bend regions, ensures that displacement of the flange material which has to take place in forming the bends can only be outwards or inwards relative to the web, i.e. in the case of the rearward bends indicated a~ 20 on Figure 3 the web forms the smallest radius side of the bend and the flange has to be somewhat stretched longitudinally, the invention ensuring that its width is correspondingly reduced in a uniformly graduated manner without substantially 1 1795~31 affecting the finished appearance. In the forward bend indicated at 21 where the web is at the greatest radius portion the flange has to be compressed and is thus particularly susceptible to crinkling or rippling using known processes, use of the present invention ensures that the metal is displaced laterally so that it becomes somewhat wider in a uniformly graduated manDer at this region but remains truly planar.
The invention may bave application to other bending or possibly straightening processes effected on channel sections where cranking, joggling or single or double bends have to be provided in the planes of the flanges.
Tbus for some applications only a single locating ram and corresponding bolster may be needed with projection 18 or its eguivalent and its counter-pressure means operating to form a single bend, the shaping of tbese elements being according to the degree of curvature and angles required in the finished article. For some applications the provision for compensation in respect of "spring-back" may be unnecessary and the overbending rams 17a, 17b may be dispensed with.
It is also to be appreciated that the invention could be based on other forms of press or bending tool, for example vertical presses and/or screw operated presses.
DESCR~PTION
This invention relates to the bending of channel section members, for example in- the manufacture of vebicle chassis frames or other fabricated structures using sheet or plate metal members.
It is often reguired to form a bend or bends in a channel section lying in the plane of the flanges of the channel i.e. involving deformation of the flanges about an axis or axes normal to their planes. This involves stretching or compression of the flange material longitudinally of the member particularly in those parts of the flange which will form the maximum radius parts of the finished bend. Specifications of metal used may vary 80 that behaviour of the material, is, to some extent, unproductable. These problems have caused difficulty in bending cbannel sections satisfactorily as regards finished appearance and maintaining consistent dimensions. In particular bending has often resulted in 20 unsightlyand possibly weakening ripples or crin~ling of areas of tbe flanges in the regions of the bend or bends.
Tbe object of the invention is to provide a method of an appratus for bending channel section members which permits close control of the bending process and improved and consistent results, giving a finished workpiece wbich 1 1799~1 is of neat and uniform appearance and precisely dimensioned.
According to the invention there is provided apparatus for bending an elongate member comprising a pair of spaced parallel planar flanges extending normally from a planar web to form a channel section, said apparatus comprising interacting formations which are shaped for ad movable into close fitting engagement with the interior and exterior faces of each flange at least in a region of the member in which a bend is to be effected, said formations being articulated for movement of at least a first section relative to a second section to apply a bending force acting in the planes of the flanges to longitudinally spaced portions of the member for relative displacemeDt thereof to form at least one bend, said close fitting engagement of the flange faces being maintained during said displacement to ensure that the flanges in said region of the member remain planar.
The invention further resides in a method of forming a bend or bends in a channel section member by taking the steps of the process carried out by the apparatus above defined, and in a member processed, i.e. bent, using said apparatus and/or method.
Said bending may be simple, i.e. a single bend so that a first portion of the member i6 bent at an angle to a second portion, or compound i.e. forming more than one bend so that a first portion is angled or laterally offset with respect to another portion or portions e.g.
cranked or joggled, the offset being along a plane parallel to one or more of the remaining portions.
Thus in forming a joggle in which a centre straight portion of the member is to be laterally offset with respect to two end portions, the latter being on a commoD
axis, a total of four bends (two pairs in opposite directions) will be necessary and the apparatus may be adapted to form all these bends in a single step while maintaining the flanges planar in all the bend regions.
~ 179~31 The apparatus may further include provision for overbending to allow for spring back of portions of t~e material after the workpiece is released following bending.
One practical embodiment of the invention is now more particularly described with reference to the accompanying drawings wherein:
Figure 1 is a sectional plan view of operative parts of a bending press at the commencement of an operating cycle;
Figure 2 is a like view of the press with the psrts in tbe coacting position of the bending process;
Figure 3 is a diagram of a workpiece;
Figure 4 is a section on line 4-4 of Figure 1, and Figure 5 is a section on line 5-5 of Figure 2.
The example of the invention now to be described relates to the forming of side members of vehicle chassis frames, said members being pressed from heavy gauge metal sheet or plate to a channel cross section having a pair of spaced parallel flanges which are generally horizontal in tbe assembled chassis and a vertical web betwePn and normal to the flanges.
In tbe present example the member 9 is required to be finished to the shape indicated diagrammatically by the full lines of Figure 3 to include a double cranking or joggle so that a straight intermediate portion A is laterally offset with respect to straight end portioos B.
A straight channel section is first formed by conventional processes and is then bent to the final form by the metbod and in the apparatus now to be described.
Referring to Figures 1 and 2 the apparatus is based on a standard 400 ton horizontal hydraulic press comprising a main ram 10 carrying a main ram head 11 which coacts with a fixed platen 12 of the press.
As best seen in Figure 1 and 4, central portion of platen 12 has upper and lower parallel spaced guide blocks 13 defining a channel open towards head 11 and extending laterally of the press, said channel having a 179~3 width which closely fits the outer faces of the flanges of member 9.
Opposite end portions of said channel have respective fixed bolsters 14 mounted therein, outer faces of said bolsters being convex in plan longitudinally of the channel.
Between bolsters 14 the rear wall of said channel is cut away to contain a movable longitudinal counter-pressure member 15 which can be selectively advanced or retracted by means of a hydraulic counter-pressure ram 16 within platen 12.
Parts of platen 12 lying laterally beyond guide members 13 each include a respective hydraulic overbending ram 17awhose heads can be advanced or retracted in conjunction with corresponding overbending rams 17_ carried on the main ram head 11.
Head 11 incorporates a central projection 18 extending longitudinally and having a planar forward face whose length corresponds substantially with the length of counterpressure member 15 terminating in curved end faces.
Projection 18 will enter the channel between members 13 when head 11 is advanced and the vertical depth of the projection is such that it is a close fit between the flanges of the member.
Also carried on main head 11 is a pair of locating ram~ 19 having beads which can be selectively advanced or retracted relative to main head 11 in coacting relationship with bolsters 14 of platen 12, said heads also being a close fit between the member flanges.
The acting parts of the heads of rams 19 extend forwardly of vertically projecting lips l9a (see Figure S) which abut tbe outer faces of members 13 to define a fixed clearance between the end face of the ram head and the face of the corresponding bolster 14, said clearance closely accommodating the thickness of the web of member 9.
~ ~79~3 The operation of the press is as follows A straight length of member (which may be of uniform or non-uniform section throughout its length, e.g., the deptb and/or spacing of the flanges may change along the 5 lengtb or in regions thereof) is located in the channel between members 13 in the position indicated by broken lines in Figure 1 and with counter-pressure member 15 advanced in line with the foremost parts of the curved faces of bolsters 1~ so that the web is backed by these.
Main head 11 is advanced so that projection 18 enters between the flanges until it is pressing a centre portion of the web against counter-pressure member 15, back pressure being applied to ram 16 to tightly engage said portion of tbe web and keep it flat while main head 11 continues its advance.
At the same time tbe acting parts of the heads of locating rams 19 are also entered between the flanges, these rams being pressurised so that lips 19a are maintained in abutment with the outer faces of guide members 13 as referred to above. This maintains the flanges and web in alignment but permits the end portions B to slide longitudinally to the extent necessary to provide the shorter overall length needed to form the offset or joggle.
In this positions (as shown in Figure 2) the central portion of the member which is to be subjected to the double bending and, in particular, its flanges, are closely confined in all directions by the coacting faces of the platen and main bead assemblies including the guide members 13, the projection 18, and the heads of locating rams 19 so that no part of them can be displaced upwardly or downwardly out of their general parallel planes. Tbis confined condition is maintained throughout advance of the main ram head 11 to displace the centremost region of member 9 laterally against the counter-pressure exerted by member 15 to the exte~lt necessary to create the desired double bending or joggle thus no crinkling or rippliDg of the member flanges can ~ ~79g31 take place in the regions of the four bends necessary to create this shape.
The extent of displacement of the centre section can be selectively adjusted to allow for "spring-back" so that the final sbape, when released from the press, is within reguired tolerances even though the specification of the metal, in particular its yield strength, may vary.
The effect of tbe above bending process will tend to stress the material so that, wben released from the press, the outer end portions B will spring toward the positions indicated by broken lines at Bl in Figure 5.
In-built correction for this is provided by selective operation of tbe overbending rams 17a, 17b to apply or maintain pressure on and portions ~ during the press operation to deflect them sufficiently to compensate for this "spring-back" e.g. to displace them toward the position shown by dotted lines B2 or to compensate for any over-correction applied.
The operation of the invention provides a cranked or joggled channel section chassis side or other member to extremely close and consistent tolerances of high strength and durability and of good appearance. In particular the avoidance of crinkling or waves in the flanges at the bend regions considerably enhances the appearance, facilitates subsequent assembly as planar upper and lower faces are maintained for accurate mounting of components etc., and may improve the strength and resistance to flexure of the finished member.
Tbe confining of the flanges in the way above described, particularly in the bend regions, ensures that displacement of the flange material which has to take place in forming the bends can only be outwards or inwards relative to the web, i.e. in the case of the rearward bends indicated a~ 20 on Figure 3 the web forms the smallest radius side of the bend and the flange has to be somewhat stretched longitudinally, the invention ensuring that its width is correspondingly reduced in a uniformly graduated manner without substantially 1 1795~31 affecting the finished appearance. In the forward bend indicated at 21 where the web is at the greatest radius portion the flange has to be compressed and is thus particularly susceptible to crinkling or rippling using known processes, use of the present invention ensures that the metal is displaced laterally so that it becomes somewhat wider in a uniformly graduated manDer at this region but remains truly planar.
The invention may bave application to other bending or possibly straightening processes effected on channel sections where cranking, joggling or single or double bends have to be provided in the planes of the flanges.
Tbus for some applications only a single locating ram and corresponding bolster may be needed with projection 18 or its eguivalent and its counter-pressure means operating to form a single bend, the shaping of tbese elements being according to the degree of curvature and angles required in the finished article. For some applications the provision for compensation in respect of "spring-back" may be unnecessary and the overbending rams 17a, 17b may be dispensed with.
It is also to be appreciated that the invention could be based on other forms of press or bending tool, for example vertical presses and/or screw operated presses.
Claims (2)
1. An apparatus for bending an elongate member comprising a pair of spaced parallel planar flanges extending normally from a planar web to form a channel section, said apparatus including movable means shaped for close fitting engagement with the interior and exterior faces of each said flange at least in a region of said elongate member in which a bend is to be formed, said movable means being articulated for movement of at least a first section relative to a second section to apply a bending force acting in the planes of said flanges to longitudinally spaced portions of said elongate member for relative displacement thereof to form at least one bend, said movable means being maintained in a close fitting engagement with said flange faces during said displacement whereby said flanges in said region of said member are maintained in a planar position.
2. An apparatus for bending an elongate member as set forth in claim 1, wherein said first portion of said elongate member is bent at an angle to a second portion of said elongate member forming more than one bend whereby a first portion is offset with respect to another portion of said elongate member, said offset being along a plane parallel to at least one of the remaining portions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8108388 | 1981-03-18 | ||
| GB8108388A GB2094681B (en) | 1981-03-18 | 1981-03-18 | Bending |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1179931A true CA1179931A (en) | 1984-12-27 |
Family
ID=10520448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000396013A Expired CA1179931A (en) | 1981-03-18 | 1982-02-10 | Bending |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS57165125A (en) |
| AU (1) | AU553143B2 (en) |
| BR (1) | BR8201474A (en) |
| CA (1) | CA1179931A (en) |
| DE (1) | DE3208867A1 (en) |
| FR (1) | FR2502032B1 (en) |
| GB (1) | GB2094681B (en) |
| IT (1) | IT1148124B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826420A (en) * | 1984-10-29 | 1989-05-02 | The Boeing Company | Apparatus for forming thermoplastic laminates into major sections |
| IT1183969B (en) * | 1985-11-22 | 1987-10-22 | Plast Di Crupi D E C Snc C | EQUIPMENT AND PROCEDURE FOR MANUFACTURING SHAPED ITEMS OF PLASTIC MATERIAL PARTICULARLY FILLING PIPES FOR FUEL TANKS FOR MOTOR VEHICLES |
| JPS62119803U (en) * | 1986-01-21 | 1987-07-30 | ||
| JPH01271014A (en) * | 1988-04-22 | 1989-10-30 | Wakabayashi Seisakusho:Kk | Bending method for pipe stock |
| US5561902A (en) * | 1994-09-28 | 1996-10-08 | Cosma International Inc. | Method of manufacturing a ladder frame assembly for a motor vehicle |
| JP2002028731A (en) * | 2000-07-13 | 2002-01-29 | Komatsu Ltd | Method and apparatus for bending long size member |
| CN101391276B (en) * | 2008-09-19 | 2010-06-02 | 江苏沪宁钢机股份有限公司 | Bending method of large-size channel steel and special bending forming die |
| WO2012101830A1 (en) * | 2011-01-28 | 2012-08-02 | トヨタ自動車株式会社 | Press forming dies |
| EP2896467B1 (en) * | 2012-09-12 | 2020-08-19 | Nippon Steel Corporation | Method for producing curved article |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE117879C (en) * | ||||
| US689609A (en) * | 1901-08-31 | 1901-12-24 | Bettendorf Metal Wheel Co | Bending-machine. |
| US2141736A (en) * | 1937-07-06 | 1938-12-27 | Boeing Aircraft Co | Offset die |
| US2310498A (en) * | 1940-08-02 | 1943-02-09 | Douglas Aircraft Co Inc | Forming machine |
| US2433808A (en) * | 1944-07-03 | 1947-12-30 | Douglas Aircraft Co Inc | Forming device |
| DE1088322B (en) * | 1956-04-25 | 1960-09-01 | Andre Huet | Machine for the double cropping of a straight pipe |
| US2884985A (en) * | 1957-05-20 | 1959-05-05 | Itt | Punch and die for bending channel member |
| DE1527336A1 (en) * | 1965-09-21 | 1969-04-24 | Hamburger Flugzeugbau Gmbh | Universal pressing tool |
| JPS5223624A (en) * | 1975-08-19 | 1977-02-22 | Matsushita Electric Ind Co Ltd | Organic electrolyte battery |
-
1981
- 1981-03-18 GB GB8108388A patent/GB2094681B/en not_active Expired
-
1982
- 1982-02-10 CA CA000396013A patent/CA1179931A/en not_active Expired
- 1982-02-17 AU AU80558/82A patent/AU553143B2/en not_active Ceased
- 1982-03-09 IT IT47951/82A patent/IT1148124B/en active
- 1982-03-11 DE DE19823208867 patent/DE3208867A1/en not_active Ceased
- 1982-03-17 FR FR8204502A patent/FR2502032B1/en not_active Expired
- 1982-03-17 BR BR8201474A patent/BR8201474A/en unknown
- 1982-03-17 JP JP57042475A patent/JPS57165125A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2094681A (en) | 1982-09-22 |
| GB2094681B (en) | 1984-11-21 |
| JPS57165125A (en) | 1982-10-12 |
| BR8201474A (en) | 1983-02-01 |
| AU553143B2 (en) | 1986-07-03 |
| FR2502032B1 (en) | 1988-07-15 |
| IT8247951A0 (en) | 1982-03-09 |
| IT1148124B (en) | 1986-11-26 |
| FR2502032A1 (en) | 1982-09-24 |
| DE3208867A1 (en) | 1982-11-25 |
| AU8055882A (en) | 1982-09-23 |
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