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EP2030701A1 - Outil et procédé destinés à la fabrication d'un élément creux - Google Patents

Outil et procédé destinés à la fabrication d'un élément creux Download PDF

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Publication number
EP2030701A1
EP2030701A1 EP07016691A EP07016691A EP2030701A1 EP 2030701 A1 EP2030701 A1 EP 2030701A1 EP 07016691 A EP07016691 A EP 07016691A EP 07016691 A EP07016691 A EP 07016691A EP 2030701 A1 EP2030701 A1 EP 2030701A1
Authority
EP
European Patent Office
Prior art keywords
die
segments
hollow
hollow molded
molded part
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Withdrawn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
EP07016691A
Other languages
German (de)
English (en)
Inventor
Eberhard Dr.-Ing. Rauschnabel
Bernhard Prof. Dr.-Ing. Adams
Karsten Dipl.-Ing. Juhr
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.)
IFUTEC INGENIEURBUERO FUER UMFORMTECHNIK GMBH
STIFTUNG FACHHOCHSCHULE OSNABRUECK
Original Assignee
Ifutec Ingenieurbuero fur Umformtechnik GmbH
Stiftung Fachhochschule Osnabrueck
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 Ifutec Ingenieurbuero fur Umformtechnik GmbH, Stiftung Fachhochschule Osnabrueck filed Critical Ifutec Ingenieurbuero fur Umformtechnik GmbH
Priority to EP07016691A priority Critical patent/EP2030701A1/fr
Priority to PCT/IB2008/002189 priority patent/WO2009027789A2/fr
Priority to EP08806905.9A priority patent/EP2180964B1/fr
Publication of EP2030701A1 publication Critical patent/EP2030701A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K23/00—Making other articles
    • B21K23/04—Making other articles flanged articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls
    • B21C37/205—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes or tubes with decorated walls with annular guides
    • 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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • B21D17/025—Forming single grooves in sheet metal or tubular or hollow articles by pressing by pressing tubes axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting

Definitions

  • the present invention relates to a tool for forming a hollow molded part with a first die and a second, adjustable die, which is divided into a plurality of movable, in particular displaceably mounted segments.
  • the invention further relates to a method for forming a hollow molded part, wherein in a first process step, a hollow molded part is inserted into a first die, which surrounds and supports the hollow molded part annularly in a support region along its lateral surface, and in which in a second process step, the hollow molded part in Direction of its major axis is compressed such that the hollow molded part is plastically deformed in a not supported by the first die forming area.
  • the present invention further relates to a hollow part produced by such a method.
  • the forming tool according to the invention belongs to a class of tool systems in which, for example, according to the EP 1 611 973 A1 a multi-part die is provided for supporting the outside of a hollow molded part on which a flange is to be formed by means of plastic deformation.
  • the die is divided in the axial direction into two die parts, which are adjustable relative to each other during a plastic forming operation.
  • the reshaped hollow molded part is subjected to a Axialpressvorgang, which brings the basic problem of buckling with it, so that only comparatively thin flanges can be produced on the hollow molded part.
  • the method according to the invention which is preferably to be performed with a forming tool according to the invention, belongs to the category of transverse extrusion methods, by means of which wide, flange-like thickenings of hollow moldings can be produced.
  • a typical effect is that when axial compression of a hollow molded part, in particular a tubular element, the material largely moves outward.
  • the result for wider thickening or higher degrees of deformation is the problem that the wall of the hollow molded part bulges outward, wherein optionally results in an inner fold inside the hollow molded part.
  • Such a configuration causes a weakening of the (dynamic) strength of the hollow molded part, which is generally unacceptable and can not be easily compensated by increasing the wall thickness of the hollow molded part.
  • the object of the invention is therefore to provide a forming tool with which the widest possible wall thickening by plastic deformation of a hollow molded part can be produced.
  • the object of the invention is also to provide a method of the type mentioned in which to produce a hollow mold part in a particularly simple manner by Querf jetpressen the widest possible wall thickening without an inner fold.
  • a forming tool in which a first die is assigned a second adjustable die, which is subdivided into a plurality of movable segments, in particular displaceably mounted in different directions, the mold part to be formed during a plastic deformation of the same on several sides, in particular Support radial direction and which are adjustable, in particular in the radial direction in particular during a plastic deformation of the hollow molded part.
  • the segments of the second die preferably form a multi-part ring in a working position the reshaped hollow molded part.
  • the second die can be moved in the radial direction, in particular with respect to a main axis of the molded part to be formed, so that a successively or continuously enlargeable space can be made available to the shaped part during the forming process.
  • the movement of the segments can be braked with constant or swelling force by a suitably controllable drive, adjustment and / or braking mechanism is coupled to the segments.
  • a plurality of segments are each mounted translationally displaceable along an associated straight line, wherein the respective associated straight lines of a plurality of segments are arranged in a common, in particular oriented perpendicular to a major axis of the reshaped hollow molded part plane.
  • Each segment is given a displacement along the associated straight line, wherein the associated straight lines preferably intersect at a point on the main or rotational axis of the hollow molded part.
  • a plurality of segments is assigned a common support, actuation, and / or actuation element, in particular a common drive element.
  • a common Abstütz-, actuation, and / or control element can be applied to the respective segments, for example, the same acceleration or braking forces.
  • the segments in question can be assigned the same displacement path lengths.
  • the segments can be jointly controlled according to a freely definable force, displacement or acceleration curve by means of a computer.
  • the individual segments are preferably coupled via a common, largely rigid transmission with a supporting, actuating and / or control element.
  • a plurality of segments is assigned a common transmission element, via which substantially equal forces can be transmitted between the segments and a common actuating, control and / or supporting element.
  • the gear element preferably converts a predefinable parameter, for example a moment or a total support force, into largely identical individual forces, each individual force acting on an associated segment.
  • a plurality of segments is associated with a substantially inelastic cam gear, which has a ring element, via which the segments are preferably supported in the radial direction.
  • the ring element is preferably rotatably mounted about an axis of rotation, which further preferably coincides with a symmetry and / or main axis of the hollow molded part.
  • On the ring element for example, a plurality of largely identical, curved guide surfaces are provided which each interact with a corresponding segment.
  • the segments are slidably supported on the guide curves in at least one direction with a small coefficient of friction.
  • mainly a supporting force acting in the direction of the displacement path of the associated segment is exerted on the segment.
  • a plurality, in particular all segments have an equal thickness transversely to their direction of displacement, which corresponds to two to twenty times, in particular three to ten times the value of the (initial) wall thickness of the shaped hollow part to be formed.
  • the segments in a working position form an elastic and / or multi-part mandrel within the reshaped hollow molded part. In this way, wide flanges can be produced within the hollow molding in the axial direction.
  • the segments in a first working position form a multi-part ring around the hollow molded part or in the hollow molded part.
  • a ring has in a second working position a relation to the first working position changed diameter.
  • certain distances or gaps between the segments can be provided in both working positions, in particular in the circumferential direction.
  • the distances or their passage cross sections are preferably smaller than the contact surfaces of the segments, which cooperate with the hollow molded part.
  • the object is further achieved by a method having the features of claim 9, wherein the hollow molded part is supported on the outside in the forming area by a second, adjustable in its geometry die.
  • the second die supplements the first die in which it supports the hollow shaped part in the forming region in such a way that a force acts on the hollow shaped part from the outside during the forming step.
  • the second die is made yielding, in particular by being elastically deformable or resilient and / or designed to be adjustable during the forming step.
  • the hollow molded part is not initially provided by the thickening to be formed total space to be taken, but a smaller space available, so that the material flow in the forming step is made uniform and directed both inward and outward.
  • An inventive forming tool for forming a particular metallic hollow molded part 1 with preferably circular cylindrical lateral surface comprises in a first embodiment according to the Fig. 1 and 2 a first die 2a, 2b, wherein the die 2a, 2b transverse to a main axis 4 of the tool is divided so that there are two independent die parts 2a, 2b.
  • the die parts 2a, 2b are in turn again divided in each case in the axial direction.
  • the die thus comprises, in particular, a first annular die part 2a and a second annular die part 2b, into which the hollow shaped part 1 is preferably inserted accurately and which are initially positioned at a distance from one another. Between the die parts a forming area U is formed which is not supported by the die parts 2a, 2b.
  • a second die 3 which is adjustable in its geometry and / or changeable is arranged, which preferably surrounds the hollow shaped part 1 in the forming region U initially with a certain distance.
  • the second die 3 is divided into four segments 3a, 3b, 3c, 3d in the direction of one or more planes parallel to the main axis 4 of the hollow shaped part 1 and / or in the direction of one or more planes E1, E2 containing the main axis 4 of the hollow molded part (cf. , Fig. 2 ).
  • the segments are movable in a manner not shown on one or more carriers, in particular resiliently and / or adjustably mounted.
  • the segments together form a multi-part circular cylindrical ring.
  • at least one segment has a geometry deviating on the inside from the circular cylindrical shape.
  • the second die 3 is designed as elastically deformable, closed, the hollow mold part 1 enclosing ring, in particular as a spring band or as a hydraulic pressure hose.
  • the hollow molded part 1 in the die parts 2a, 2b used.
  • Die 2a, 2b and mold part 1 are positioned such that the first die 2a, 2b, the hollow mold part 1 in a support region S along its lateral surface 1 'annular surrounds and supports (see. Fig. 1 ).
  • the hollow molded part can be supported via a mandrel, not shown.
  • the hollow mold part 1 in an upstream process step above room temperature are heated and subjected to the subsequent process steps in a warm state.
  • a second process step the hollow mold part 1 is compressed by means of a pressing device, not shown in the direction of its major axis 4 such that the hollow mold part 1 is plastically deformed in the non-supported by the first die 2a forming area U, wherein the hollow molded part in the forming area U is supported by the second die 3 on the outside at least after a certain forming movement.
  • material of the hollow molded part 1 can flow in the radial direction to the outside and / or to the inside, wherein the flow of material by means of the second die 3 and optionally by means of a mandrel is controllable.
  • the said forming movement is terminated in particular when the material of the hollow molded part has completely filled the space provided within the dies 2, 3 and optionally around the mandrel.
  • the second die 3 is moved in a direction transverse to the main axis of the hollow shaped part 1 (arrow 5); In particular, it is opened continuously and / or gradually in the radial direction.
  • the latter is in Fig. 1 by dashed lines and in Fig. 2 shown schematically by arrows 7.
  • a continuous and / or stepwise opening movement of the second die 3 can be superimposed on an oscillating movement of individual segments 3a, 3b, 3c, 3d of the second die.
  • the second die 3 is pressed against the hollow mold part 1 during the forming process or during a temporal part of the forming process with a predetermined force and / or a predetermined force curve.
  • the second die 3 is preferably moved in the radial direction during the forming process or a part of the forming process along a predetermined path and / or with a predetermined course of speed.
  • the second die 3 and / or the hollow molded part 1 and / or individual segments are rotated during the forming step about the main axis 4 of the hollow molded part; This is preferably done in a completely circular cylindrical and rotationally symmetrical workpiece design.
  • individual die parts can additionally be rotated about one (or several different) parallel to the main axis 4, but spaced from this axis (s). This makes it possible to achieve particularly small radial gaps between the segments in each working position.
  • first die part 2a and the second die part 2b of the first die 2 are moved toward one another in the direction of the arrows 6 during the forming process, thereby assisting a material flow to the outside.
  • first die part 2a and the second die part 2b of the first die 2 are moved apart in the opposite direction to the arrows 6 during the forming process, so that a material flow in the axial direction is made possible.
  • all cases can be a continuous Movement of the first female part 2a and the second female part 2b superimpose a (possibly oscillating) axial movement of the die parts and / or the hollow molded part 1.
  • the radial and / or axial movement of the die parts is superimposed on a (possibly oscillating) rotational movement or a movement in the circumferential direction.
  • a second embodiment according to the Fig. 3 and Fig. 4a, 4b corresponds essentially to that according to the Fig. 1 and 2 Therefore, reference can be made to the above description in its entirety and equivalent components are provided with the same reference numerals.
  • the forming tool comprises in the second embodiment, in turn, a first die 2a, 2b, which in turn a first annular die part 2a and a second annular die part 2b, in which the hollow mold part 1 is inserted.
  • a forming area U is formed which is not supported by the die parts 2a, 2b.
  • a second die 3 adjustable in its geometry is arranged, which surrounds the hollow shaped part 1 in the forming area U.
  • the second die 3 is subdivided in the direction of three planes E1, E2, E3 containing the main axis 4 of the hollow shaped part 1 into six segments 3a-3f (cf. Fig. 4a, 4b ).
  • the segments are resiliently supported by mechanical coil springs 10 on a support 9.
  • the segments 3a - 3f together form a multi-part approximately circular cylindrical ring, which in a first working position according to Fig. 4a the hollow mold part 1 completely, that encompasses without significant gaps.
  • the hollow molded part 1 is during a forming step or during several forming steps from a third die in the form of engaging in the hollow mold part, cylindrical mandrel 8a, 8b supported inside.
  • the hollow molded part is subjected to a Axialpressvorgang in a forming step.
  • the hollow molded part 1 is compressed by means of a pressing device 11 in the direction of its main axis 4 such that the hollow molded part 1 is plastically deformed in the Umform Stud U not supported by the first die 2a, wherein the hollow molded part in the forming area U of the second die 3 on the outside with a force defined by the springs 10 is supported.
  • material of the hollow molded part 1 can flow in the radial direction to the outside, wherein the material flow by means of the second die 3 is preset controllable.
  • a surface load of 10 N / mm 2 to 100 N / mm 2 is set between the hollow mold part and the contact surfaces of the segments 3a-3f which contact the hollow mold part.
  • approximately 10% to 30% of the yield stress of the material of the hollow molded part is set as surface loads between the segments and the hollow molded part.
  • the spring characteristics can be chosen to be linear, but also progressive or degressive.
  • the segments 3a-3f of the second die 3 are moved in different directions transversely to the main axis of the hollow molded part 1 (arrows 5).
  • Each segment is assigned a separate movement path in the radial direction, the straight lines of the movement paths intersecting one another at a point M on the main axis 4.
  • the die 3 can in turn be opened continuously, stepwise or oscillating in the radial direction.
  • Fig. 4b a second working position of the segments 3a - 3f is shown, which preferably after a (first) Forming step is taken and in which the second die is at least approximately opened.
  • an adjustable and / or elastically deformable mandrel 8a, 8b can be provided.
  • inner collars can be produced in an analogous manner or inner recesses can be produced.
  • Fig. 6a and 6b Possible results of the forming process according to the invention are the Fig. 6a and 6b refer to.
  • a formation of an inner fold is avoided so that dynamic loadable hollow parts (eg gear shafts for gearboxes and the like) with a small wall thickness and a wide flange can be produced from the formed hollow shaped part.
  • a machining operation is provided in a method following the described forming steps.
  • a possible end product in the form of a gear shaft is schematically shown in FIG Fig. 7 shown. Out Fig. 7 it can be seen that an (axial) width d of the flange is greater than three times the initial wall thickness t of the hollow molded part.
  • Fig. 5a and 5b is a third embodiment of a forming tool according to the invention shown in two different working positions.
  • the structure of the forming tool corresponds in principle to the previously described embodiments, so that in turn the same reference numerals are used for components having the same effect and, moreover, to a possible embodiment of the device and the forming process in full Reference may be made to the previous embodiments.
  • the forming tool in the third embodiment in turn comprises a first die into which the hollow molded part 1 is inserted. Within the first die, a forming area is formed, which is not supported by the first die. In this forming area, in turn, a second die 3 adjustable in its geometry is arranged, which surrounds the hollow shaped part 1 in the forming area U.
  • the second die 3 comprises four segments 3a-3d, which are mounted linearly displaceably within a guide device 12 in the radial direction and are coupled to a gear 13.
  • the segments 3a-3d together with the guide means form a multi-part ring which, in a first working position according to FIG Fig. 5a surrounds the hollow molded part 1.
  • the thickness of the segments in the pressing direction preferably corresponds substantially to the width of the flange to be produced.
  • the segments 3a-3d on the inner side in each case adapt to the hollow shaped part 1 by a concave cylindrical surface, wherein the radius of the concave cylindrical surfaces preferably corresponds to the outside radius of the finished shaped hollow shaped part.
  • the segments 3a-3d have lateral extensions in the region of their inner, concave cylindrical surfaces.
  • each lateral extension is preferably embodied in each case in one piece with the associated segment and preferably extend in the direction of at least one adjacent segment.
  • each lateral extension engages between the inner, concave cylindrical surface of the adjacent segment and the outer surface of the hollow molded part.
  • the hollow molded part 1 is preferably supported on the inside during a forming step by a third die in the form of a mandrel.
  • the transmission 13 essentially comprises four radially guided cap sections 3a ', 3b', 3c ', 3d', which are connected on the one hand to the segments 3a-3d and each have a convex cylindrical surface on the radially outer side.
  • the cap portions 3a '- 3d' are supported with their convex cylindrical surfaces in a ring 14 each on an associated cylindrical guide surface 14a, 14b, 14c, 14d.
  • the centers Ma, Mb, Mc Md of the convex cylindrical surfaces are preferably located on the radial displacement vectors of the segments 3a-3d.
  • the ring 14 is rotatably supported about the point of intersection M of the radial displacement vectors of the segments 3a-3d, wherein the point of intersection M of the displacement vectors is again preferably located on the main axis 4 of the hollow molded part.
  • the center points Xa, Xb, Xc, Xd of the cylindrical guide surfaces 14a-14d do not lie on the radial displacement vectors of the respective associated segments 3a-3d, but each with an identical distance thereto.
  • the cap portions 3a '- 3d' and the ring therefore contact each other offset by a distance Y in the region of a contact line N (in Fig. 5a exemplified for segment 3b, cap portion 3b 'and associated guide surface 14b).
  • a force-transmitting element 15 is assigned to the ring 14, which in the Fig. 5a and 5b is shown purely schematically.
  • the power element 15 has a (passive) mechanical, pneumatic or hydraulic spring 19, the is connected via a lever arm 20 with the ring 14.
  • a controllable hydraulic cylinder may be provided which serves as a drive or brake unit for targeted adjustment of the ring.
  • an adjustment of the ring 14 via an adjustment of the force or the torque and / or via an adjustment of path or angle of rotation and / or speed or angular velocity and / or accelerations or angular accelerations take place.
  • a modified embodiment comes as a force-giving element 15 and instead of the spring 19, an electric servomotor used.
  • the friction coefficient between the cap portions 3a '- 3d' and the guide surfaces is chosen as low as possible, namely about 0.05 to 0.25 (but preferably below 0.15).
  • Gear tools, ball bearing steels (type 100Cr6) and all types of cold and high-speed steels are provided as tool materials of the gear unit.
  • the surface hardness of these construction elements is preferably above 60 HRC.
  • rollers are interposed between surfaces sliding against each other.
  • the transmission 13 sets the opening movement of the segments 3a - 3d in a rotational movement of the ring about the rotation axis M. This rotation acts now the power-giving element 15 against.
  • the force-transmitting element 15 controls the radial forces on the segments 3a - 3d preferably such that they press with 10% to 30% of the yield stress of the material to be formed against the hollow mold part. Buckling or buckling of the hollow molded part 1 is prevented.
  • FIG. 8 A fourth embodiment according to Fig. 8 corresponds to the principle according to the previous embodiments, which is why reference can be made to the above description in its entirety and equivalent components are provided with the same reference numerals.
  • the forming tool again comprises a first die 2a, 2b, which in turn has a first annular die part 2a and a second annular die part 2b into which the hollow shaped part 1 is inserted.
  • a forming area U is formed which is not supported by the die parts 2a, 2b.
  • a second adjustable die 3 is arranged, which surrounds the hollow shaped part 1 in the forming region U.
  • the second die 3 is subdivided into a plurality of segments 3a, 3b, wherein the segments 3a, 3b are supported on a common ring 14 which is displaceable parallel to the main axis 4 and has a funnel-shaped sliding surface 14e.
  • a plurality of individual wedge elements are provided with planar wedge surfaces instead of the ring 14, which in turn are slidably mounted in the direction of the main axis 4.
  • a ring is provided with a plurality of inside planar sliding surfaces.
  • the ring 14 is optionally rotatably mounted about the main axis 4, it is also and especially in this case divided in the axial direction.
  • the ring 14 or an annular part thereof forms a more or less rigid unit with a plurality of hydraulic rams 16, which in turn are guided in hydraulic cylinders 17 (arrow 18).
  • the hydraulic plunger 16 together with the hydraulic cylinders 17 are components of a common support, actuation, and / or control unit, wherein a plurality of hydraulic cylinders are preferably arranged rotationally symmetrically about the main axis 4 of the system.
  • one or more hydraulic springs are provided in a modified embodiment (analogous to the force-transmitting element 15 in the third embodiment), which act in the direction of the arrow 18 on the ring 14
  • the hydraulic cylinders optionally an active drive in the form of a hydraulic pump with fluid circuit or a passive mechanical, pneumatic or hydraulic spring assigned.
  • the drive is used for targeted adjustment of the ring 14.
  • an adjustment of the ring 14 via an adjustment of the force and / or the path and / or the speed and / or the accelerations of the hydraulic ram done.
  • the coefficient of friction between the segments 3a, 3b and the guide surfaces chosen as low as possible, namely about 0.05 to 0.15.
  • Gear tools, ball bearing steels (type 100Cr6) and all types of cold and high-speed steels are provided as tool materials of the gear unit.
  • the surface hardness of these construction elements is preferably above 60 HRC.
  • an active or passive lubrication of the sliding surfaces between the segments 3a, 3b and the ring 14 may be provided with oil, grease or friction reducing surface coatings.
  • the hollow molded part 1 is supported on the inside during a forming step or during a plurality of forming steps by a third die in the form of a cylindrical mandrel 8a, 8b engaging in the hollow shaped part.
  • the hollow molded part is subjected to an axial compression process in a forming step.
  • the hollow molded part 1 is compressed by means of a pressing device 11 in the direction of its main axis 4 such that the hollow molded part 1 is plastically deformed in the Umform Scheme U not supported by the first die 2a, the hollow molded part supported in the forming area U of the second die 3 on the outside becomes.
  • the segments 3a, 3b of the second die 3 are moved in different directions transversely to the main axis of the hollow molded part 1 (arrows 5).
  • Each segment is assigned a separate movement path in the radial direction, the straight lines of the movement paths intersecting one another at a point M on the main axis 4.
  • the die 3 can in turn be opened continuously, stepwise or oscillating in the radial direction.
  • the forming tool according to the invention allows the arrangement of a few (2 ⁇ n ⁇ 5), but also of many (n> 5) segments under uniform load in a small space, since the effect of a single force element mechanically transmitted via a cam gear to n segments and on the Geometry of the arrangement is reinforced.
  • the load amplification allows a very small dimensioning of the force-giving element 15, for example as a hydraulic cylinder, for a prototype transmission part after Fig. 6a, Fig. 6b had a force of 8 kN.
  • An upsetting process with segmented die requires a special uniformity of the support load, as with asymmetric load, a bending of the compression part to the side with little support effect and thus the Euler buckling is initiated.
  • the time response of a mechanically nearly rigid cam gear is essentially delay-free.
  • the timing of a hydraulic system with small amounts of oil (control force is small because of the mechanism) is virtually ideal. Therefore, another advantage is the fact that by very rapid change of the force-time curve on the hydraulic side, the support behavior of n support segments can be influenced uniformly even with very small forming times simultaneously with the forming.
  • the system can be driven in advance as a passive oil displacement system with controlled backpressure or actively defined by a pump and thus the material flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP07016691A 2007-08-25 2007-08-25 Outil et procédé destinés à la fabrication d'un élément creux Withdrawn EP2030701A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07016691A EP2030701A1 (fr) 2007-08-25 2007-08-25 Outil et procédé destinés à la fabrication d'un élément creux
PCT/IB2008/002189 WO2009027789A2 (fr) 2007-08-25 2008-08-24 Outil et procédé pour produire un élément creux
EP08806905.9A EP2180964B1 (fr) 2007-08-25 2008-08-24 Procédé pour déformer un élément creux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07016691A EP2030701A1 (fr) 2007-08-25 2007-08-25 Outil et procédé destinés à la fabrication d'un élément creux

Publications (1)

Publication Number Publication Date
EP2030701A1 true EP2030701A1 (fr) 2009-03-04

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP07016691A Withdrawn EP2030701A1 (fr) 2007-08-25 2007-08-25 Outil et procédé destinés à la fabrication d'un élément creux
EP08806905.9A Not-in-force EP2180964B1 (fr) 2007-08-25 2008-08-24 Procédé pour déformer un élément creux

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP08806905.9A Not-in-force EP2180964B1 (fr) 2007-08-25 2008-08-24 Procédé pour déformer un élément creux

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EP (2) EP2030701A1 (fr)
WO (1) WO2009027789A2 (fr)

Cited By (2)

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EP2711106A3 (fr) * 2012-09-19 2014-12-03 IFUTEC Ingenieurbüro für Umformtechnik GmbH Procédé de fabrication d'épaississements larges en forme de bride sur une pièce creuse
DE102013209948A1 (de) * 2013-05-28 2014-12-18 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Verfahren zur Bearbeitung oder Umformung hochbelastbarer Bauteile in Kraftfahrzeugen

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DE102012003174B4 (de) * 2012-02-17 2017-06-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Herstellen eines Hohlprofils mit Abschnitten unterschiedlicher Wandstärke
TWI494179B (zh) * 2012-09-28 2015-08-01 Twdt Prec Co Ltd Mandrel manufacturing method
RU2753073C1 (ru) * 2020-12-08 2021-08-11 Федеральное государственное бюджетное образовательной учреждение высшего образования "Тульский государственный университет" (ТулГУ) Способ получения рифлей на наружной поверхности оболочки

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EP0497438A1 (fr) * 1991-01-28 1992-08-05 MANNESMANN Aktiengesellschaft Procédé et dispositif d'elargissement de profils creux tubulaires
WO1999020414A1 (fr) * 1997-10-20 1999-04-29 Josef Worringer Procede et dispositif pour produire un arbre a partir d'un element tubulaire, et arbre a cames produit a partir d'un element tubulaire
US20030091680A1 (en) * 2001-11-15 2003-05-15 Blethen Karl Jay Die assembly for forming a bead on a cylindrical tube
WO2003064953A1 (fr) * 2002-02-01 2003-08-07 Behr Gmbh & Co. Dispositif de transfert de chaleur de gaz brules
EP1611973A1 (fr) * 2004-07-01 2006-01-04 IFUTEC Ingenieurbüro für Umformtechnik GmbH Procédé de formage de tubes et de fabrication d'arbres creux

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US4782679A (en) * 1985-08-14 1988-11-08 Gesenkschmiede Schneider Gmbh Process for the production of flanges or collars on hollow parts by lateral extrusion
EP0497438A1 (fr) * 1991-01-28 1992-08-05 MANNESMANN Aktiengesellschaft Procédé et dispositif d'elargissement de profils creux tubulaires
WO1999020414A1 (fr) * 1997-10-20 1999-04-29 Josef Worringer Procede et dispositif pour produire un arbre a partir d'un element tubulaire, et arbre a cames produit a partir d'un element tubulaire
US20030091680A1 (en) * 2001-11-15 2003-05-15 Blethen Karl Jay Die assembly for forming a bead on a cylindrical tube
WO2003064953A1 (fr) * 2002-02-01 2003-08-07 Behr Gmbh & Co. Dispositif de transfert de chaleur de gaz brules
EP1611973A1 (fr) * 2004-07-01 2006-01-04 IFUTEC Ingenieurbüro für Umformtechnik GmbH Procédé de formage de tubes et de fabrication d'arbres creux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711106A3 (fr) * 2012-09-19 2014-12-03 IFUTEC Ingenieurbüro für Umformtechnik GmbH Procédé de fabrication d'épaississements larges en forme de bride sur une pièce creuse
DE102013209948A1 (de) * 2013-05-28 2014-12-18 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Coburg Verfahren zur Bearbeitung oder Umformung hochbelastbarer Bauteile in Kraftfahrzeugen

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EP2180964B1 (fr) 2014-07-30
EP2180964A2 (fr) 2010-05-05
WO2009027789A3 (fr) 2009-07-02

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