EP0317830B1 - Procédé de pliage d'objets métalliques - Google Patents
Procédé de pliage d'objets métalliques Download PDFInfo
- Publication number
- EP0317830B1 EP0317830B1 EP19880118683 EP88118683A EP0317830B1 EP 0317830 B1 EP0317830 B1 EP 0317830B1 EP 19880118683 EP19880118683 EP 19880118683 EP 88118683 A EP88118683 A EP 88118683A EP 0317830 B1 EP0317830 B1 EP 0317830B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- heating
- bending
- plate
- cooling
- 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.)
- Revoked
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/20—Bending sheet metal, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
Definitions
- the invention relates to a method of bending a metal object by locally heating the object to plasticise the metal and by cooling the object thereafter as well as by repeating the heating and cooling step.
- DE-16 27 490 A describes as general prior art the orientation of metal objects by locally restricted heating of the metal object in order to produce shrinking stresses within the object. Such shrinking stresses result from upsettings because of prevented heat expansion and subsequent cooling.
- the special prior art of this publication refers to bending straight cylindrical pipes into an arc by first heating an inner section of the pipe up to a plastified state of the material and heating thereafter a corresponding outer section of the pipe joined by cooling of the sections. This sequence of steps can be repeated. Preferred is flame heating or heating by induction. Additionally, the parts between the inner section and the outer section to be heated can be cooled during heating, preferably by a protective inert gas. The locally heating sections have a shape of the surfaces similar to a rhombus, a diagonal of which extends in axial direction. This prior art method is not applicable for bending flat parallel objects especially of brittle or hard materials.
- This object is achieved with the method of the generic kind in that a plate-shaped metal object is heated and cooled, in that the local heating is carried out on one side of the plate shaped metal object along a straight line which becomes the bending line, in that the heating along the straight line is performed such that the metal is partially melted and in that the metal is plasticised and melted to a depth smaller than the thickness of the plate-shaped metal object, wherein such heating causes an outflow of metal within the region of the bending line while subsequent cooling at ambient temperature or additionally in a stream of blown gas transforms the metal into solid state and causes shrinking of the metal perpendicularly to the bending line which results in a permanent bending deformation at an angle along the bending line.
- plate-shaped metal objects can be bent at a predetermined angle without exertion of external forces. Such bending is successfully carried out even if the plate-shaped object consists of a brittle material or of a material of high strength or high hardness. Further, the method can be used for bending plate-shaped objects when access to them is difficult, i.e. under vacuum or under hazardous conditions as high tension, harmful radiation and the like.
- the heating is performed with a focussed laser radiation beam or a concentrated high-power electron beam.
- the surface of the heated metal is covered with a substance increasing the coefficient of absorption of the flow of energy.
- the metal of the plate-shaped object being bent is subject to heating with concentrated flow of energy SE of laser radiation.
- Application of the flow of energy SE of the laser radiation, moving at speed V along the bending line AA entails a local change in the condition of a region P of the metal characterised by different properties at depth G.
- the temperature distribution of the heated material indicates additionally the material melting temperature T m .
- the material of the first zone S1 and the second zone S2 flows out to occupy an increased volume as a result of the stresses caused by the effect of thermal expansion.
- This temperature distribution related to melting temperature T m determines the size of the first zone S1 and the second zone S2 relative to material thickness L.
- the material is cooled at ambient temperature or, additionally, in a stream of a blown gas.
- the material within the region of the bending line, i.e. the liquid in first zone S1 and the plasticised material in the second zone S2 is transformed into solid state.
- the boundary of the region encompassing the plasticising and melting zone in the heating phase has been marked with line U in Fig. 4.
- the heating and cooling conditions are selected so that the tensile and compressive stresses created in the material should be much smaller than are their limit stresses.
- the heating and cooling parameters such as the energy flow movement speed, the power of the energy flow, the absence or presence and nature of a layer absorbing the flow of energy, etc.
- control is exercised on the magnitude of the stresses created in the material in order to obtain the desired angle of bending (Figs. 1 and 4) during one cycle of heating and cooling along the bending line.
- the flat parallel slab shown in Figs. 1 and 2 has been subjected to a process of bending according to this present invention.
- the slab 0.7 mm thick and 20 mm wide, is made of 50HSA steel and heated with a radiation beam of a continuously operating 300 W CO2 laser, the source of energy moving along line AA (Fig. 2) at the speed of 2.5 cm/sec.
- the beam is directed perpendicularly to the surface of the slab.
- the heating takes place under a protective argon atmosphere.
- the slab was cooled in the ambient atmosphere within about 1 second. With such conditions after a single heating and cooling cycle, the slab was bent at the angle ⁇ of 2,8°.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Laser Beam Processing (AREA)
Claims (3)
- Procédé de cintrage d'un objet métallique par chauffage local de l'objet pour plastifier le métal et par refroidissement subséquent de l'objet ainsi que par répétition des étapes de chauffage et de refroidissement, caractérisé- en ce qu'un objet métallique en forme de plaque est chauffé (SE) et refroidi,- en ce que le chauffage local (SE) est réalisé sur un côté de l'objet métallique en forme de plaque suivant une ligne droite (AA) qui devient la ligne de cintrage,- en ce que le chauffage (SE) le long de la ligne droite (AA) est réalisé de telle manière que le métal est partiellement fondu (S1), et- en ce que le métal est plastifié (S2) et fondu (S1) jusqu'à une profondeur (G) inférieure à l'épaisseur (L) de l'objet métallique en forme de plaque,- ce chauffage (SE) provoquant un écoulement de métal dans la région de la ligne de cintrage tandis que le refroidissement subséquent à la température ambiante ou en plus dans un courant de gaz soufflé fait passer le métal à l'état solide et provoque un retrait du métal perpendiculairement à la ligne de cintrage, ce qui entraîne une déformation de cintrage permanente sous un angle (δ) le long de la ligne de cintrage (AA).
- Procédé selon la revendication 1, caractérisé en ce que le chauffage (SE) est réalisé avec un faisceau laser focalisé ou un faisceau électronique concentré de haute énergie.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que la surface du métal chauffé est recouverte d'une substance qui augmente le coefficient d'absorption du flux d'énergie (SE).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL26903987A PL155358B1 (en) | 1987-11-26 | 1987-11-26 | Method of bending metal workpieces |
PL269039 | 1987-11-26 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0317830A2 EP0317830A2 (fr) | 1989-05-31 |
EP0317830A3 EP0317830A3 (en) | 1990-05-23 |
EP0317830B1 true EP0317830B1 (fr) | 1992-09-30 |
Family
ID=20039185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880118683 Revoked EP0317830B1 (fr) | 1987-11-26 | 1988-11-09 | Procédé de pliage d'objets métalliques |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0317830B1 (fr) |
JP (1) | JPH01192423A (fr) |
DE (1) | DE3875078T2 (fr) |
ES (1) | ES2035219T3 (fr) |
PL (1) | PL155358B1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5142778A (en) * | 1991-03-13 | 1992-09-01 | United Technologies Corporation | Gas turbine engine component repair |
EP0794562A2 (fr) * | 1996-03-07 | 1997-09-10 | Seiko Instruments Inc. | Procédé de micro-usinage et structure micro-usinée |
FR2771471A1 (fr) | 1997-11-24 | 1999-05-28 | Siemens Ag | Procede d'ajustement de la course d'aiguille dans des valves de dosage et valve de dosage ajustee par ce procede |
WO2001039959A1 (fr) * | 1999-12-03 | 2001-06-07 | Siemens Aktiengesellschaft | Procede pour plier sans contact des pieces constituees d'une matiere synthetique thermoplastique, et piece pliee ou ajustee selon ledit procede |
US6251328B1 (en) | 1995-04-24 | 2001-06-26 | Fraunhofer-Gesellshcaft Zur Foerderung Der Angewandten Forschung E.V. | Device and process for shaping workpieces with laser diode radiation |
DE19958232A1 (de) * | 1999-12-03 | 2001-07-05 | Siemens Ag | Verfahren zum berührungslosen Biegen von Teilen aus einem Kunststoff mit thermoplastischen Eigenschaften und nach diesem Verfahren gebogenes oder justiertes Teil |
DE19958231A1 (de) * | 1999-12-03 | 2001-07-05 | Siemens Ag | Verfahren zum berührungslosen Biegen von Teilen aus einem Kunststoff mit thermoplastischen Eigenschaften und nach diesem Verfahren gebogenes oder justiertes Teil |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3905551C3 (de) * | 1989-02-23 | 1996-09-26 | Laser Bearbeitungs Und Beratun | Verfahren und Vorrichtung zur Behandlung von Oberflächen mittels Laserstrahl |
DE4235192C2 (de) * | 1992-10-19 | 1996-05-30 | Ttk Kunststoff Tech Gmbh | Verfahren und Vorrichtung zur Verformung, insbesondere zum Biegen, von im wesentlichen flächigen Gegenständen |
PL299688A3 (en) * | 1993-07-15 | 1995-01-23 | Pan | Method of bending metal workpieces |
US7356055B2 (en) | 2001-04-12 | 2008-04-08 | Finisar Corporation | Method and device for regulating the average wavelength of a laser, especially a semiconductor laser |
DE10118451A1 (de) | 2001-04-12 | 2002-10-24 | Aifotec Ag Fiberoptics | Justierverfahren, insbesondere Laser-Justierverfahren, und hierfür geeigneter Aktor |
DE10128827A1 (de) | 2001-06-15 | 2003-01-09 | Aifotec Ag Fiberoptics | Justierverfahren, insbesondere Laser-Justierverfahren und hierfür geeigneter Aktor |
CN100434203C (zh) * | 2006-02-28 | 2008-11-19 | 江南造船(集团)有限责任公司 | 铝镁合金船体水火矫正方法 |
CN105414246A (zh) * | 2015-12-16 | 2016-03-23 | 西北工业大学 | 钛合金激光弯曲成形零件弯曲角的预测方法 |
CN114101391B (zh) * | 2021-09-08 | 2023-06-09 | 蓝箭航天空间科技股份有限公司 | 航天用大型尺寸低刚度件的矫形方法及液体火箭 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2428825A (en) * | 1941-02-27 | 1947-10-14 | Linde Air Prod Co | Method of controlling distortion, straightening distorted objects, and/or altering the shape of metal objects |
DE888401C (de) * | 1943-07-20 | 1953-08-31 | Administration Sequestre Des R | Verfahren zum Richten von Werkstuecken |
DE1160815B (de) * | 1959-07-21 | 1964-01-09 | Hoesch Ag | Verfahren zur Herstellung von Profilen aus kaltgewalzten oder vergueteten Stahl- undNichteisenmetallbaendern |
DE1627490A1 (de) * | 1967-06-07 | 1970-05-06 | Babcock & Wilcox Ag | Verfahren zur Herstellung von Boegen |
JPS62110883A (ja) * | 1985-11-09 | 1987-05-21 | Mitsubishi Electric Corp | ド−ム状構造物の製造方法 |
JPS62134118A (ja) * | 1985-12-05 | 1987-06-17 | Mitsubishi Electric Corp | 板ばねの形状精度修正方法 |
JPS62134117A (ja) * | 1985-12-05 | 1987-06-17 | Mitsubishi Electric Corp | 管の製造方法 |
-
1987
- 1987-11-26 PL PL26903987A patent/PL155358B1/pl unknown
-
1988
- 1988-11-09 ES ES88118683T patent/ES2035219T3/es not_active Expired - Lifetime
- 1988-11-09 DE DE19883875078 patent/DE3875078T2/de not_active Expired - Fee Related
- 1988-11-09 EP EP19880118683 patent/EP0317830B1/fr not_active Revoked
- 1988-11-24 JP JP63299385A patent/JPH01192423A/ja active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5142778A (en) * | 1991-03-13 | 1992-09-01 | United Technologies Corporation | Gas turbine engine component repair |
EP0504095A2 (fr) * | 1991-03-13 | 1992-09-16 | United Technologies Corporation | Réparation de composant de moteur de turbine à gaz |
EP0504095A3 (en) * | 1991-03-13 | 1992-10-28 | United Technologies Corporation | Gas turbine engine component repair |
US6251328B1 (en) | 1995-04-24 | 2001-06-26 | Fraunhofer-Gesellshcaft Zur Foerderung Der Angewandten Forschung E.V. | Device and process for shaping workpieces with laser diode radiation |
EP0794562A2 (fr) * | 1996-03-07 | 1997-09-10 | Seiko Instruments Inc. | Procédé de micro-usinage et structure micro-usinée |
FR2771471A1 (fr) | 1997-11-24 | 1999-05-28 | Siemens Ag | Procede d'ajustement de la course d'aiguille dans des valves de dosage et valve de dosage ajustee par ce procede |
WO2001039959A1 (fr) * | 1999-12-03 | 2001-06-07 | Siemens Aktiengesellschaft | Procede pour plier sans contact des pieces constituees d'une matiere synthetique thermoplastique, et piece pliee ou ajustee selon ledit procede |
DE19958232A1 (de) * | 1999-12-03 | 2001-07-05 | Siemens Ag | Verfahren zum berührungslosen Biegen von Teilen aus einem Kunststoff mit thermoplastischen Eigenschaften und nach diesem Verfahren gebogenes oder justiertes Teil |
DE19958231A1 (de) * | 1999-12-03 | 2001-07-05 | Siemens Ag | Verfahren zum berührungslosen Biegen von Teilen aus einem Kunststoff mit thermoplastischen Eigenschaften und nach diesem Verfahren gebogenes oder justiertes Teil |
DE19958231B4 (de) * | 1999-12-03 | 2005-10-06 | Siemens Ag | Verfahren zum berührungslosen Biegen von Teilen aus einem Kunststoff mit thermoplastischen Eigenschaften und nach diesem Verfahren gebogenes oder justiertes Teil |
Also Published As
Publication number | Publication date |
---|---|
DE3875078D1 (de) | 1992-11-05 |
PL269039A1 (en) | 1989-05-30 |
PL155358B1 (en) | 1991-11-29 |
DE3875078T2 (de) | 1993-02-18 |
ES2035219T3 (es) | 1993-04-16 |
EP0317830A3 (en) | 1990-05-23 |
JPH01192423A (ja) | 1989-08-02 |
EP0317830A2 (fr) | 1989-05-31 |
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