EP1651366A1 - PROCEDE ET DISPOSITIF PERMETTANT DE FAçONNER UNE PIECE CONSTITUEE D'UN MATERIAU PRESENTANT UN COMPORTEMENT A LA CONTRAINTE DE TRACTION-ALLONGEMENT DE TYPE EXPONENTIEL POUR OBTENIR UNE ENVELOPPE CREUSE A PAROI MINCE - Google Patents

PROCEDE ET DISPOSITIF PERMETTANT DE FAçONNER UNE PIECE CONSTITUEE D'UN MATERIAU PRESENTANT UN COMPORTEMENT A LA CONTRAINTE DE TRACTION-ALLONGEMENT DE TYPE EXPONENTIEL POUR OBTENIR UNE ENVELOPPE CREUSE A PAROI MINCE

Info

Publication number
EP1651366A1
EP1651366A1 EP04726499A EP04726499A EP1651366A1 EP 1651366 A1 EP1651366 A1 EP 1651366A1 EP 04726499 A EP04726499 A EP 04726499A EP 04726499 A EP04726499 A EP 04726499A EP 1651366 A1 EP1651366 A1 EP 1651366A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
pressure roller
center line
pressure
clamping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04726499A
Other languages
German (de)
English (en)
Inventor
Erich Sieger
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.)
Erich Sieger Firma
Original Assignee
Erich Sieger Firma
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 Erich Sieger Firma filed Critical Erich Sieger Firma
Publication of EP1651366A1 publication Critical patent/EP1651366A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers

Definitions

  • the present invention relates to a method and a device for deforming a workpiece made of a material with exponential tensile stress-strain behavior to form a thin-walled, hollow shell. Furthermore, the invention also relates to a method and a device for shaping a workpiece from a material which has only been deformable at known hot forming temperatures and which, according to the present invention, can now be deformed into a thin-walled, hollow shell even at slightly elevated temperatures.
  • Alloys have an exponential tensile strain V obtained. Such materials are to be shaped into thin shells, in particular, for example, into a spherical half-shell or into a hemisphere-like shell shape. basically only possible as pressure forming, since the high-strength and light materials with their corresponding properties would otherwise be damaged. Such methods are also referred to as net-shape processes.
  • EP 0 457 358 A2 discloses a method and an apparatus for metal pressing. It is proposed here to clamp a blank made of difficult-to-deform material on the circumference and to arch it out to a final dimension into a free space with the aid of a movement-controlled pressing tool 3, that is to say without using a spinning chuck. A similar procedure and device is known from US 3,342,051. Here, too, deformation without spinning chuck is disclosed. DE-OS 1 527 973 also teaches a similar process for the production of rotary surfaces, in which no compression mold is to be used.
  • GB 2 302 832 A discloses a method and an apparatus for metal forming.
  • a blank is held on a rotating die by means of a counter punch arranged in the center.
  • the blank is deformed by means of a pressure roller that follows a specific contour and thus shapes the blank according to the shape.
  • Such a method cannot be used for molding materials of the type mentioned at the outset which have very high material tensile strengths.
  • EP 0 593 799 B1 deals in detail with the shaping of workpieces from the materials mentioned. In particular, the specific problems of forming are dealt with in detail. In addition, the problems of other forming processes for workpieces made of the materials mentioned are explained in detail.
  • the cited EP 0 593 799 B1 and the parallel US Pat. No. 5,426,964 teach a simpler and more cost-effective method for cold-forming a material with exponential tensile stress-strain behavior to form hollow shells of low wall thickness.
  • a sheet metal blank is clamped on the circumference and rotated around its center line by means of a drive.
  • the rotating sheet metal blank is cold-formed between the first and second web-controlled pressure rollers, which act on opposite sides of the sheet metal blank, to the shell solely by local compressive forces.
  • the relative speed between the workpiece and the pressure rollers and the force exerted by the pressure rollers on the workpiece are coordinated with one another in such a way that tensile forces introduced into the workpiece lie below the yield strength of the material. According to this proposed procedure, namely, the material is not subjected to any tensile forces in the plastic area and the deformation occurs only through compressive forces exerted on the workpiece by the two opposing pressure rollers.
  • the pressure forces to be applied via the pressure rollers can be dosed very precisely, so that not only shells of constant wall thickness, but also with wall thickness changing over the circumference of the shell can be easily produced. Due to the use of opposing pressure rollers, the springback that occurs when springing back can be controlled so precisely that shells can be manufactured with a very high degree of dimensional accuracy. However, under certain circumstances a very large number of "forming passes" may be necessary to achieve the desired shell shape, which makes the process time-consuming and also involves relatively high manufacturing costs.
  • forming pass or forming steps or passing through a spinning roller from its starting position (in the area of the center line of the workpiece to be deformed) to its end position (near the edge of the workpiece circumference).
  • a technical problem on which the invention is based may, for example, be to provide a procedure for deforming workpieces made of a material with exponential tensile stress-strain behavior to form a thin-walled, hollow shell which manages with fewer forming steps. Furthermore, a device is to be provided which allows such workpieces to be deformed with one or a few reshaping steps.
  • this technical problem on which the invention is based is solved, for example, by a method for deforming a workpiece made of a material with exponential tensile stress-strain behavior to form a thin-walled, hollow shell, in which, for example, at least the following steps are carried out can.
  • the workpiece is clamped on the circumference and actively rotated around its center line.
  • a freely rotatable pressing mold which has an outer side shaped to the desired shell shape, is pressed against a workpiece side with a suitable compressive force.
  • At least one path-controlled spinning roller is pressed against the other workpiece side, so that the workpiece rotating on the spinning mold is deformed to the shell at least partially or solely by local tensile forces, the relative speed between the workpiece and the at least one spinning roller and that of the at least one spinning roller and the pressing force exerted on the workpiece are coordinated with one another in such a way that compressive forces introduced into the workpiece lie below the yield strength of the workpiece.
  • a device for carrying out a method according to the invention can comprise a clamping device which can be rotated about a center line for circumferentially clamping the workpiece.
  • a drive for rotating the clamping device around the center line can be an electric motor, for example.
  • the device comprises at least one path-controlled pressure roller, which lies opposite the pressure form.
  • a first control device is used to control the path of the at least one spinning roller.
  • a second control device ensures that the
  • Relative speed between the workpiece and the at least one pressure roller and the force exerted on the workpiece by the at least one pressure roller and the pressure form are coordinated with one another such that tensile forces introduced into the workpiece lie below the yield strength of the material of the workpiece.
  • a workpiece can be cold-formed from the above-mentioned special materials which are problematic in terms of their deformation, without a large number of forming passes of the at least one pressure roller being necessary; at least less can
  • a desired shell shape can now also be achieved with the materials mentioned in one or a few forming passes.
  • This is possible for the first time according to the invention by compression-compression molding, but a compression mold having a convex outer shape not only provides the counterpressure to the pressure roller acting on the outside, but also a pre-pressing force by means of the displaceable shape, with a tension adjusted in accordance with the progress of the molding Workpiece is effected.
  • This tensile stress is achieved in the workpiece in that the workpiece is firmly clamped on the peripheral edge and the shape is also used as a “drawing punch”.
  • the direction of expansion which is determined by the local rolling out of the material by means of the pressure roller, is mainly redirected in the meridian direction. Due to the pressure roller rolling parallel to the circumferential direction, for example, a local pressure gauge enlargement can be effected without tension.
  • a local pressure gauge enlargement can be effected without tension.
  • the co-rotating forming or pressing die biases the workpiece.
  • the at least one counter-pressure roller always presses against the other side of the workpiece at the tangent point, for example. that the circumferential expansion necessary for shaping is brought about by local rolling out of the workpiece.
  • the risk of buckling can be reduced, the production speed can be increased and the necessary pressing force per roller can be reduced by a higher number of pressure rollers, also called counter-pressure rollers.
  • the automatic control of the forming process can take place via a hydraulic proportional valve control or via a CNC control. It goes without saying that a method according to the invention can be used not only for the shaping or production of satellite tank shells, but also for the production of other, difficult-to-deform materials and parts.
  • the mold rotates at the same speed as the workpiece, so that there is no relative movement between the workpiece and the mold top, which would lead to problems with the material mentioned.
  • the shaping of titanium- ⁇ alloys can be simplified using the method according to the invention and, of course, all the materials described in the preceding called EP 0 593 799 B1.
  • titanium sheets made of Ti 15-3-3-3 or Ti- ⁇ -21S can be deformed using the method according to the invention.
  • Workpieces made of Ti-15V-3Al-3Cr-3Sn can also be deformed.
  • the shell dimensions mentioned in EP 0 593 799 B1 can also be produced using the method according to the invention. That means, for example, shells with a diameter of up to 1000 mm or more and thicknesses of 0.5-2 and also up to 6 mm or more can be produced by means of a method according to the invention.
  • the starting workpieces are approximately 5 to 40 mm thick.
  • the angle of inclination of the at least one pressure roller relative to the circumferential direction is changed, depending on the distance the at least one pressure roller is from the center line of the workpiece and the shape of the pressure shape at this point.
  • the roller radius and the roller diameter are adapted to the pressing forces and for the forming
  • Forming direction adjusted With a large roll diameter and small radius, there is a larger deformation in the meridian direction than in the circumferential direction and vice versa.
  • a further exemplary embodiment of a device according to the invention provides that the clamping device consists of a first clamping ring and a second clamping ring, which can be clamped to one another via clamping means, the peripheral edge of the workpiece being clampable between the two clamping rings.
  • the clamping device consists of a first clamping ring and a second clamping ring, which can be clamped to one another via clamping means, the peripheral edge of the workpiece being clampable between the two clamping rings.
  • one of the two clamping rings or a bearing inner ring has external teeth with which a gear meshes, which is driven by a drive.
  • the rotary bearing on which the tensioning or clamping rings are fastened may also be expedient for the rotary bearing on which the tensioning or clamping rings are fastened to have a ring gear on the bearing inner ring with which a drive pinion meshes. It can be advantageous that the clamping or. Tension rings are screwed tight to the bearing inner ring.
  • the bearing outer ring is attached to a stator of the device and withstands the radial and axial circumferential forces.
  • the at least one pressure roller can be inclined in the desired manner with respect to the circumferential direction at certain meridian points.
  • the at least one pressure roller can be inclined in the desired manner with respect to the circumferential direction via a parallelogram guide.
  • the at least one spinning roller can also be guided via a three-axis control.
  • the first control device and the second control device are combined in a common control device.
  • At least one further pressure roller with a larger diameter is interchangeably present in order to deform peripheral areas of the workpiece.
  • Another exemplary embodiment of a device according to the invention comprises a cutting tool, in particular a turning tool. With the cutting tool, the workpiece that is still clamped can be machined in the desired workpiece areas.
  • a parting-off tool can be provided in order to cut off a finished workpiece.
  • Another technical problem on which the invention is based is to provide a procedure for shaping workpieces into a thin-walled, hollow shell, in which the workpieces do not have to be heated to a conventional hot forming temperature for the shaping, but only to an underlying temperature.
  • a workpiece blank is clamped on the circumference and actively rotated around its center line.
  • the workpiece blank is heated, at least in certain partial areas, to a temperature which is below the hot forming temperature known for the material of this blank.
  • a freely rotatable pressing mold which has an outer surface shaped to the desired shell shape, with a suitable one Compressive force pressed against one side of the workpiece.
  • At least one path-controlled pressure roller is pressed against the other workpiece side (in the heated partial areas mentioned above), so that the workpiece blank rotating on the pressure mold is deformed to the shell solely by local pressure forces, the relative speed between the workpiece and the at least one pressure roller and that of the force exerted on the workpiece, the at least one pressure roller and the pressure form are coordinated with one another in such a way that pressure forces introduced into the workpiece lie below the yield strength of the workpiece.
  • the workpiece blank is made from a titanium alloy, in particular the titanium alloy is Ti6-4.
  • the processing temperature can be selected, for example, so that the state of the exponential tensile stress-strain behavior is achieved in the workpiece blank, but no ⁇ -case is formed.
  • a workpiece blank consisting of a high-strength Al alloy is deformed into a shell.
  • the Al alloy is especially Al-2219.
  • the processing temperature is selected in particular so that a warm aged condition is achieved in the workpiece blank.
  • an exemplary comprises
  • a clamping device rotatable about a center line for circumferential clamping of the workpiece.
  • a drive for rotating the clamping device around the center line.
  • a pressing mold which is freely rotatable about the center line is provided, which is displaceable in the direction of the center line and for exercising predetermined compressive force is formed against the workpiece.
  • the device comprises at least one path-controlled pressure roller, which is opposite the pressure form.
  • a first heating device is used at least to heat the workpiece area in which the at least one pressure roller contacts the workpiece. The path of the at least one pressure roller is controlled by means of a first control device.
  • a second control device ensures that the relative speed between the workpiece and the at least one pressure roller and the force exerted on the workpiece by the at least one pressure roller and the pressure form are matched to one another such that tensile forces introduced into the workpiece are below the yield strength of the material of the workpiece lie.
  • the pressing mold is heated to a specific holding temperature by means of a second heating device.
  • the first heating device consists of a plurality of heating devices which can bring separate workpiece areas to the desired processing temperature.
  • the first heating device can be changed mechanically or manually.
  • the first and second heating devices are gas burners.
  • the heating devices are heating spirals or infrared heating devices.
  • Fig. 1 is a schematic sectional view of an exemplary
  • Fig. 2 is a representation similar to Fig. 1, in which two different
  • FIG. 3 is a representation very similar to FIG. 2 of a further embodiment of a device according to the invention with an additional pressure roller with a larger diameter for deforming a workpiece section lying more on the peripheral edge of the workpiece,
  • FIG. 4 is a partial sectional view of a workpiece deformed according to the invention with areas to be machined
  • FIG. 5 shows a representation similar to FIG. 4 with an illustration of a
  • Fig. 6 is a schematic representation to illustrate various aspects of the present disclosure.
  • FIG. 7 shows a further schematic illustration of a workpiece in initial and final form
  • 8 is a schematic representation of the processes in the workpiece during the forming
  • FIG. 9 shows a schematic sectional view of a further embodiment of a device according to the invention for shaping a workpiece from a material which has hitherto been deformable only at known hot forming temperatures
  • Fig. 10 is a schematic modification of the device according to the invention shown in Fig. 9.
  • a device comprises, for example, a pressing device 1, which comprises a pressing device 4, a pressing die 2 and a control device 50.
  • the mold 4 has an outer side 4a, which corresponds to the desired shell shape.
  • This outer side 4a of the pressing mold 4 is basically convex. In cross-section, however, it can not only have a constant curvature, but also change the direction of curvature.
  • the die 4 is coupled to the die 2.
  • This plunger 2 is part of a piston-cylinder unit, for example via a pneumatic or
  • Hydraulic unit causes a displacement of the mold 4 with a predetermined force.
  • This piston-cylinder unit and thus the pressing and pulling mold 4 are controlled in the direction of a center line M via the control device 50.
  • the device further comprises a holder 5 in which a tensioning device is embedded.
  • the tensioning device here comprises a first tensioning ring 7 and a second tensioning ring 12, which can be tensioned with respect to one another by means of tensioning screws 11 evenly distributed over the circumference.
  • the first clamping ring 7 is also the inner ring of a rolling bearing.
  • the outer ring 6 is integrated in the holder 5. Like a normal ball bearing, the outer roller bearing ring 6 and the inner roller bearing ring 7 are roller-supported by balls.
  • a second roller bearing consisting of inner ring 9 and outer ring 8 and balls lying between them is also present in order to rotatably mount the entire device in the holder 5.
  • the second clamping ring 12 is here provided with external teeth, in which a schematically illustrated gear 13 engages.
  • This gear is driven by a drive A, again only shown schematically, so that the clamping ring 12 can be driven in a controlled manner via the gear 13.
  • a further alternative to rotating the clamped workpiece 24 0 could look such that the bearing inner ring or a component connected to it (not shown) is driven via a form belt which is coupled to a drive wheel. Training as a rubberized friction wheel is also possible.
  • a small friction wheel with the mating wheel fixedly connected to the bearing inner ring 7 would be driven in rotation by friction.
  • the mold 4 is rotatably mounted on the plunger 2, but is not itself driven. It is also possible that the pressing die 4 and the pressing die 2 are not rotatably connected to one another, but instead the rotating die 2 can then be rotated in the piston-cylinder unit.
  • a pressure roller bearing 25 is arranged in front of the holder 5.
  • the pressure roller bearing 25 comprises a base body 28 on which various rods or rods 18, 19, 20, 21, 22, 23 are rotatably mounted. Two of the rods 18, 19 and 22, 23, which are rotatably mounted on the base body 28, have pressure roller holders 14, 15 at their free ends. These are in turn rotatably mounted on respective bars. Pressing rollers 16, 17 are rotatably mounted on the brackets 14, 15. The inclination of the spinning rollers can be adjusted and displaced outward via the parallelogram formed, ie the distance to the center line M can be changed. Due to the parallelogram kinematics, the pressure rollers 16, 17 remain essentially at the same height, even with increasing distance from the center line M. At the same time, the pressure rollers 16, 17 on each circumferential line of the workpiece 24 have the necessary and most suitable inclination for deformation.
  • the two brackets 14, 15 are coupled to one another via the rods 20, 21. These two rods are in turn coupled to a piston-cylinder unit 26 via a common push rod 27.
  • the piston-cylinder unit 26 causes the spinning rollers to move apart and thus an adjustable distance from the center line M.
  • the piston-cylinder unit 26 can be controlled via a control device 40. Both the control device 40 and the control device 50 for the piston-cylinder unit 1 of the pressing mold 4 and the drive A can be connected to one another via cables 51 or can be integrated in a common control device.
  • the aforementioned embodiment of a device according to the invention works and is operated as follows.
  • the workpiece 24 0 is in the form of a sheet metal blank and preferably has the shape of a circular disk in plan view. At the circumferential edge, this sheet metal blank is firmly clamped between the two clamping rings 7 and 12. The drive of the one clamping ring 12 is then actuated in order to actively rotate the workpiece 24 0 about the center line M.
  • the pressure rollers 16, 17 are very close to the center point, ie at the level of the center line M against one side of the workpiece 24 0 driven, at the same time the pressing mold 4 is pressed with a predetermined force against the other side of the workpiece 24 0 , so that the workpiece 24 0 increasingly arched, rotated at the same time and a counterforce from the pressure rollers 16, 17 is applied.
  • the mold can preferably also be moved against the workpiece 24 0 before it is then rotated. These processes are controlled by the
  • the pressing mold 4 is continuously shifted further along the center line direction, at the same time the pressing rollers 16, 17 are slowly shifted outwards via the parallelogram linkage.
  • the pressure rollers 16, 17 follow the contour of the pressure mold 4 or the desired shell shape.
  • the workpiece 24 is reshaped at the tangent points, that is to say the points at which the workpiece 24 lifts off from the outside of the mold 4. It is important here that the pressing force of the pressing mold 4 and the rotational speed of the workpiece 24 and the counterforce of the pressure rollers 16, 17 are coordinated with one another, so that the desired deformation takes place in the workpiece 24 according to the illustration in FIG. 8 without bulging or the like.
  • the workpiece 24 0 can only be deformed with one movement of the pressure rollers 16, 17 from the inside, ie from the center line M, to the outside.
  • the pressure rollers 16, 17 it is also possible for the pressure rollers 16, 17 to be moved again to the center and for a new deformation process and a further application of force to take place with the pressure mold 4, so that several “passes” are necessary until complete deformation in accordance with the predetermined outer contour of the pressure mold 4 are.
  • the spinning rollers 16, 17 are in the position near the center line M at the beginning of the shaping process.
  • the end position at the end of the forming process is marked with an apostrophe.
  • the final shape of the workpiece 24 is identified here with the reference symbol 24 '.
  • the different degrees of travel of the plunger 4 can be seen from the illustration according to FIG. 2.
  • the various degrees of deformation of the workpiece 24 are also shown.
  • the end position is shown here with 24 3 , an intermediate position with 24] or 24.
  • FIG. 3 A further exemplary embodiment of a device according to the invention is shown in FIG. 3.
  • one or more pressure rollers 30 with a larger diameter are used for the edge-side deformation of the workpiece 24 3 .
  • Larger diameter means a diameter that is larger than that of the pressure rollers 16, 17, which are provided for an initial deformation.
  • a shell 24 in the final state has areas 31, 32 that are still to be turned off. Machining of, for example, edge regions of the shell 24 can thus take place here with the workpiece 24 clamped. It is also possible to cut off the shell, which is finished on the outside, by means of a parting-off tool 40, as can be seen from FIG. 5.
  • the circumferential direction is perpendicular to the center line M, the
  • FIG. 7 a workpiece 24 0 is shown again in the initial shape for better clarity with reference number 24 3 the workpiece is shown in its final shape.
  • 8 shows, as already explained above, the basic compressive forces which are introduced selectively into the workpiece 24 by the pressure roller 16, 17 and the pressure mold 4 and which lead to a desired deformation without exceeding the yield strength of the material of the workpiece 24.
  • the exemplary embodiment shown here comprises a first heating device 100 and a second heating device 101. Both heating devices are designed here as gas burners.
  • the first heating device 100 is aligned in such a way that a warm air flow sweeps along the inside of the workpiece 24.
  • this first heating device 100 it is also possible for this first heating device 100 to comprise a plurality of heating points, so that the inside of the workpiece 24 is heated in different partial areas.
  • the second heating device 101 is aligned in such a way that it produces heating on the outside of the workpiece 24.
  • the second heating device 101 can therefore be advantageous to design the second heating device 101 to be displaceable or movable, so that heating always takes place on the outside of the workpiece 24 in the area of the pressure rollers.
  • a plurality of second heating devices can also be used instead of the one second Heating device 101 may be provided so that the workpiece 24 is then also heated on the outside in the region of all the pressure rollers 16, 17.
  • a corresponding hot-forming temperature according to the invention can be, for example, in the range from 500 ° C. to 600 ° C., classic hot-forming temperatures are, for example, above 600 ° C.
  • conventional process methods require peripheral temperatures of 650 ° C. to 850 ° C. for process reasons.
  • the workpiece 24 that is to say the workpiece blank, in particular a sheet metal blank, is brought to a hot-forming temperature below 650 ° C. and, via the pressure rollers 16, 17, as already explained with reference to FIGS. 1-8, reshaped.
  • the plunger 4, etc. is moved against the spinning rollers and the workpiece 24 is deformed into a shell.
  • the workpiece 24 is kept at the necessary forming temperature via the temperature measuring device 102 and the heating device 100, 101.
  • the workpiece 24 consists of a titanium alloy Ti 6 - 4 (Ti 6A14V). Due to the selected forming temperature of approx. 600 ° C, no oxidation takes place even with a longer machining time, i.e. there is no oxide layer or an alpha case layer. With conventional forming processes that require a forming temperature of 650 ° C to 850 ° C, oxide and
  • Diffusion layers (the aforementioned alpha case layers). It is only through the combined procedure according to the invention and the achievement of a hot forming temperature that has not hitherto been suitable for deformation that the previous disadvantageous oxide layer or ⁇ -case layer formations can be avoided. Accordingly, the previously required mechanical finishing of a surface of a shell obtained.
  • an alternative for a material is high-strength aluminum alloys, in which the forming temperatures can be kept very low. From a metallurgical point of view, the workpiece 24 can then be deformed into a shell 24 3 without structural changes in the workpiece 24.
  • Such a method according to the invention enables for the first time high degrees of deformation in different curing states.
  • the advantage achieved here is that the finished workpiece 24 3 does not have to be solution-polished and then stretched and hardened cold or warm.
  • the pressing mold or only other terminology, drawing stamp must be brought to a basic temperature of approximately 100 ° C. below the desired forming temperature of the workpiece and kept.
  • the sufficient pressure resistance of the device and the thermal expansion with regard to the dimensional accuracy must be taken into account.
  • the reason for the heating of the mold 4 is the avoidance of heat dissipation from the workpiece.
  • the actual desired forming temperature is achieved from the outside directly on the workpiece 24 by the second heating device 101, in particular only at the point at which the forming is carried out (in particular tangentially).
  • the movement of the second heating device 101 can, in particular, take place manually or mechanically in a controlled manner in accordance with the pressure roller movement.
  • the temperature can be monitored manually or via a control loop control.
  • the pressing device with its rolling bearings and hydraulic cylinders in accordance with the known standard is protected against overheating by heat shields and corresponding cooling devices, as required.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne, entre autres, un procédé permettant de façonner une pièce (240) constituée d'un matériau présentant un comportement à la contrainte de traction-allongement de type exponentiel pour obtenir une enveloppe creuse à paroi mince (243). Selon ce procédé, la pièce (240) est serrée en périphérie et tournée activement autour de sa ligne médiane (M). Une matrice à repousser (4) à rotation libre comportant une face extérieure (4a) qui est façonnée conformément à l'enveloppe (243) souhaitée est pressée contre une face (24a) de la pièce avec une force de compression appropriée. Au moins un rouleau à repousser à commande continue (14, 17) est pressé contre l'autre face (24b) de la pièce, de façon que la pièce (240) en rotation se façonne d'elle-même en enveloppe (243) sous l'effet de forces de compression locales. Selon l'invention, la vitesse relative entre la pièce (240) et le(s) rouleau(x) à repousser (14, 17) et la force exercée par ce(s) rouleau(x) à repousser (14, 17) et la matrice à repousser (4) sur la pièce (240) sont ajustées l'une par rapport à l'autre de façon que les forces de compression introduites dans la pièce (240) se situent en deçà de la limite d'élasticité apparente de la pièce (240). Cette invention se rapporte également à un dispositif permettant de mettre ce procédé en oeuvre. L'invention concerne en outre un procédé et un dispositif permettant de façonner une pièce constituée d'une matière ou d'un matériau qui, jusqu'à présent, pouvait uniquement être façonné(e) à des températures de formage à chaud connues et qui, désormais, peut être façonné(e), selon la présente invention, de manière à obtenir une enveloppe creuse à paroi mince, déjà à une température inférieure à la température de formage à chaud connue pour le matériau qui constitue la pièce.
EP04726499A 2003-04-11 2004-04-08 PROCEDE ET DISPOSITIF PERMETTANT DE FAçONNER UNE PIECE CONSTITUEE D'UN MATERIAU PRESENTANT UN COMPORTEMENT A LA CONTRAINTE DE TRACTION-ALLONGEMENT DE TYPE EXPONENTIEL POUR OBTENIR UNE ENVELOPPE CREUSE A PAROI MINCE Withdrawn EP1651366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10316854A DE10316854A1 (de) 2003-04-11 2003-04-11 Verfahren und Vorrichtung zum Verformen eines Werkstücks aus einem Werkstoff mit exponentiellem Zuspannungs-Dehnungsverhalten zu einer dünnwandigen, hohlen Schale
PCT/EP2004/003807 WO2004089560A1 (fr) 2003-04-11 2004-04-08 Procede et dispositif permettant de façonner une piece constituee d'un materiau presentant un comportement a la contrainte de traction-allongement de type exponentiel pour obtenir une enveloppe creuse a paroi mince

Publications (1)

Publication Number Publication Date
EP1651366A1 true EP1651366A1 (fr) 2006-05-03

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EP04726499A Withdrawn EP1651366A1 (fr) 2003-04-11 2004-04-08 PROCEDE ET DISPOSITIF PERMETTANT DE FAçONNER UNE PIECE CONSTITUEE D'UN MATERIAU PRESENTANT UN COMPORTEMENT A LA CONTRAINTE DE TRACTION-ALLONGEMENT DE TYPE EXPONENTIEL POUR OBTENIR UNE ENVELOPPE CREUSE A PAROI MINCE

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US (1) US7243517B2 (fr)
EP (1) EP1651366A1 (fr)
DE (1) DE10316854A1 (fr)
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DE10316854A1 (de) 2004-10-21
US20060191307A1 (en) 2006-08-31

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