EP2353743B1 - Tool for bending metal sheets - Google Patents
Tool for bending metal sheets Download PDFInfo
- Publication number
- EP2353743B1 EP2353743B1 EP11150355A EP11150355A EP2353743B1 EP 2353743 B1 EP2353743 B1 EP 2353743B1 EP 11150355 A EP11150355 A EP 11150355A EP 11150355 A EP11150355 A EP 11150355A EP 2353743 B1 EP2353743 B1 EP 2353743B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- seat
- tool
- axis
- bending tool
- 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.)
- Active
Links
- 238000005452 bending Methods 0.000 title claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 6
- 239000002184 metal Substances 0.000 title claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 42
- 239000011248 coating agent Substances 0.000 claims abstract description 34
- 239000010936 titanium Substances 0.000 claims abstract description 5
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 5
- 229910017083 AlN Inorganic materials 0.000 claims abstract description 4
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 3
- 230000002035 prolonged effect Effects 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 238000001771 vacuum deposition Methods 0.000 claims 1
- 238000005461 lubrication Methods 0.000 abstract description 11
- 238000011282 treatment Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 4
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 abstract description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000005240 physical vapour deposition Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 238000000151 deposition Methods 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000008021 deposition Effects 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000002052 molecular layer Substances 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004605 External Lubricant Substances 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 239000003831 antifriction material Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000002783 friction material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
Images
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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- 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
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
-
- 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
- B21D5/042—With a rotational movement of the bending blade
Definitions
- the present invention relates to a rotary bending tool for bending metal plates or similar materials according to the preamble of claim 1 (see for example EP-B1-1 051 267 ), which, mainly comprises two distinct bodies, that is: a matrix tool provided with a suitable seat approximately cylindrical in shape formed in its body and accessible from outside; a rotating tool of substantially cylindrical shape and provided with a V-shaped groove, and suitable to be housed in said seat of said matrix tool and to rotate therein.
- the forming of said groove in said rotating tool creates a pair of lateral sides suitable to engage with the metal sheet to bend, in which one of said sides acts as a means for locking the sheet, and the other side acts as a bending means.
- US 4,002,049 Patent discloses a basic solution, which does not provide for the lubrication of the surfaces, which must slide reciprocally between said matrix tool (called “holder” or “saddle” in the above-mentioned patents) and said rotary tool.
- the solution presented therein although it is effective from the functional standpoint, still presents a fundamental limit that appears evident in an industrial scale production, and that is due to the fact that the lack of a specific lubrication generates a premature wear down of the surfaces that are designed to slide against each other, as well as a considerable increase in temperature between the devices involved, which in turn causes a natural thermal expansion that may, in the most serious cases, also cause the seizure between said surfaces, which must instead be able to slide freely on one another.
- the second and most serious problem is caused by the fact that said tampons naturally wear down or deplete the lubricant, and thus it is necessary, after a not particularly large number of operating cycles (about 100,000 cycles), to remove completely the matrix-tool + rotary-tool assembly and to remove the spent tampons and replace them with new ones.
- a tool according to a preferred embodiment of the invention comprises:
- Both said first and second body are made of high-strength metal materials or alloys, usually used for tools.
- Said second body 3 is inserted in said seat 2 of the first body through said mouth 4, and to stabilize its position a plurality of closing blocks 5 are arranged in such size and positioning as to partially close said mouth 4 so that the second body stays constantly inserted and in contact with said seat 2. It will be obvious, also because it is in itself known, that the inside diameter of the seat 2 is slightly greater than the outside diameter of the second body 3, so as to allow its rotation without interference within the seat 2.
- the "X" axis of the cylindrical shape of said seat 2 coincides with the axis of the cylindrical shape of said second body 3, which therefore also necessarily coincides with the axis of its rotation within said seat 2.
- Said second body is provided with a groove in the shape of a "V" that extends lengthwise and that is open outward through said mouth 4 for at least one part of the rotation of said second body 3 within said seat 2 of said first body 1.
- Said tool made up of said two bodies 1 and 2, is usually installed in a press comprising an upper die 6, and a bottom die 7, around an edge 8 of which is bent the material to be bent, in a manner known in the art and which therefore will not be explained.
- the second body 3 is partially surrounded by said seat 2 to a sufficient extent to engage it so as to allow it to turn freely around said axis "X", since, as explained above, the respective dimensions are such as to make said rotation possible.
- the present invention consists of building said second body 3 so that its external surface is treated in such a manner as to have absolutely new and advantageous characteristics both from the point of view of resistance to abrasion, and from the point of view of reduction of friction against external surfaces, and thus of its slidability on such surfaces.
- these characteristics combined together on the surface of said second body 3, make it possible to achieve said tool, comprising said two bodies, and in particular the second body 3, so as to avoid any form of lubrication, thus eliminating all the consequent burdens, costs and complications explained above.
- PVD Planar Vehicle
- PVD Physical Vapour Deposition
- the PVD processes are methods of atomic deposition in which the material is evaporated from a solid or liquid source in the form of atoms or molecules and carried in vapour phase through a vacuum environment or plasma to the substrate, where it condenses, at temperatures ranging from 250°C to 450°C, and in some cases even beyond, to avoid softening the material of which the substrate is composed.
- PVD is used to create coatings of a few tens or hundreds of nanometers for films composed of variable percentage alloys, and with deposition speeds of 1 to 10 nm per second.
- the main stages of a PVD film deposition process are the following:
- the external surface of the second body 3 develops special properties of resistance to abrasion if it is treated with a specific procedure consisting of providing on it a coating formed by a PVD deposition, in which is generated a series of successive layers of material or hard compounds, and having an ultra-thin thickness (and which for this reason are termed nanolayers).
- Said optimal and selected combination consists of the deposition of a number of nanolayers, in which:
- this coating consists of depositing a plurality of nanolayers of composite material made up of the above-mentioned substances, in which the various nanolayers, taken all together, include all the compounds listed above.
- said coating regardless of how it is achieved, must have a thickness of between 0.5 and 5.0 micron, and a minimum hardness of 3500 HV.
- the first coating must substantially protect the underlying surface from wear, and therefore it must be very hard, also to guarantee an easy "grip" on that surface; unlike this, the second or upper coating must ensure above all a reduction of the friction coefficient toward external surfaces that slide on it, and therefore this characteristic is preferred, although it also is not best for its hardness.
- the first coating must advantageously include a plurality of layers deposited in succession, and whose thickness is ultra thin (and which for this reason are called nanolayers), and that coincides with the type of coating (previously described in the fundamental case of deposition of a single coating).
- a generic nanolayer of the first coating includes any one of the following compounds deposited in PVD:
- this first coating consists of the deposition of a plurality of nanolayers of material made up of the substances listed above, in which the various nanolayers, taken all together, include all the above-mentioned compounds.
- CBC type Carbon Based Coating
- its hardness must be appreciably lower than 3500 HV, that is, lower than the hardness of the first layer, but it must however be substantially greater than 2000 HV, in order to avoid compromising with an excessive wear the useful life of said tool assembly.
- the tool can also be made for a particularly demanding industrial use without needing any lubrication devices between the first body and the second rotary body, like external lubricant feeding ducts, or tampons wetted with lubricant, or a jacket of low-friction material, like graphite.
- the present invention also applies in the case in which the coatings formed are more than two, that is, when the second coating too is in turn overlain with a third coating or subsequent coatings.
- Such different embodiments are naturally easily obtainable by the expert in the field, compatibly with existing requirements of cost, producibility and, naturally, greater or lesser performance characteristics desired, and in particular with the balance between the requirements of hardness and reduction of frictional resistance.
- the invention is compatible with further devices suitable to ensure the correct position of the tool at rest, shown in Fig. 1 , and particularly with its automatic return in this position; after the lifting of the top press and therefore at the end of the compressive stress between the metal sheet 9 and an edge 10, that defines said V-shaped groove, which thus belongs to said second body 3.
- Said devices thus include:
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physical Vapour Deposition (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPN2010A000002A IT1397559B1 (it) | 2010-01-15 | 2010-01-15 | Stampo perfezionato per la piegatura della lamiera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2353743A1 EP2353743A1 (en) | 2011-08-10 |
| EP2353743B1 true EP2353743B1 (en) | 2012-03-21 |
Family
ID=43733399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11150355A Active EP2353743B1 (en) | 2010-01-15 | 2011-01-07 | Tool for bending metal sheets |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2353743B1 (it) |
| AT (1) | ATE550114T1 (it) |
| IT (1) | IT1397559B1 (it) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2982512B1 (fr) * | 2011-11-15 | 2013-11-08 | Peugeot Citroen Automobiles Sa | Dispositif de pliage d'une tole pour une presse |
| IN2015DN03914A (it) * | 2012-10-22 | 2015-10-02 | Ihi Ionbond Ag | |
| AT15220U1 (de) | 2016-03-07 | 2017-03-15 | Ceratizit Austria Gmbh | Verfahren zur Herstellung einer Hartstoffschicht auf einem Substrat, Hartstoffschicht, Zerspanwerkzeug sowie Beschichtungsquelle |
| IT201700085807A1 (it) * | 2017-07-26 | 2019-01-26 | Cosma S R L | Macchina per la piegatura di lamiere, in particolare di bordi di lamiere |
| CN113547006A (zh) * | 2021-07-26 | 2021-10-26 | 王扬 | 一种汽车用弯管加工设备 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4002049A (en) | 1975-06-09 | 1977-01-11 | Ready Stamping System, Inc. | Forming tool for use in a die assembly |
| DE4203680C1 (it) * | 1992-02-08 | 1993-05-06 | Iska Wolfgang Katz Verwaltungs-Gmbh, 7735 Dauchingen, De | |
| US5913931A (en) * | 1997-11-04 | 1999-06-22 | Ready Technology, Inc. | Extended length rotary bending and forming devices and methods for manufacture thereof |
| US6672127B2 (en) * | 2000-06-23 | 2004-01-06 | Yuugenkaisha Taigaa Koosan | Metal sheet bending device with rotation inhibiting function |
| US6983634B2 (en) * | 2003-08-01 | 2006-01-10 | Danly Iem | Rotary bending tool and method of manufacture |
| US20080282760A1 (en) * | 2007-05-18 | 2008-11-20 | Danly Iem, Llc | Rotary bender with hybrid saddle |
-
2010
- 2010-01-15 IT ITPN2010A000002A patent/IT1397559B1/it active
-
2011
- 2011-01-07 EP EP11150355A patent/EP2353743B1/en active Active
- 2011-01-07 AT AT11150355T patent/ATE550114T1/de active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1397559B1 (it) | 2013-01-16 |
| ATE550114T1 (de) | 2012-04-15 |
| EP2353743A1 (en) | 2011-08-10 |
| ITPN20100002A1 (it) | 2011-07-16 |
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