EP1341623A1 - Internal high pressure forming device and method and corresponding tool system - Google Patents
Internal high pressure forming device and method and corresponding tool systemInfo
- Publication number
- EP1341623A1 EP1341623A1 EP01270389A EP01270389A EP1341623A1 EP 1341623 A1 EP1341623 A1 EP 1341623A1 EP 01270389 A EP01270389 A EP 01270389A EP 01270389 A EP01270389 A EP 01270389A EP 1341623 A1 EP1341623 A1 EP 1341623A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- pressure
- chamber
- halves
- fluid
- 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.)
- Granted
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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
- B21D26/031—Mould construction
-
- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/003—Simultaneous forming, e.g. making more than one part per stroke
Definitions
- the invention relates to a device and a method for hydroforming (IHU) and an IHU tool arrangement.
- IHU Internal high pressure forming
- workpieces to be machined is surrounded by a shaping, usually split tool, which has a fluid supply line for the application of the hydrostatic pressure required for shaping the workpiece.
- the workpieces to be reshaped can, for example, be tubes or blanks, the mold chamber located in the interior of the tool, which is connected to the fluid supply line, being designed in accordance with the desired shape of the reshaped workpiece.
- a locking device i.e. a tool carrier for clamping the tool is required, which of the locking components or
- Tool carrier components applied to the tool locking force must be equal to or greater than the force that results from the hydrostatic internal pressure introduced into the mold chamber.
- the required locking forces can become so great that elastic deformations occur in the components of the tool carrier, which in turn affect the tool halves transfer.
- the precision positive locking of the tool required for internal high pressure forming is no longer provided, so that the internal pressure at the resulting leaks can escape locally and the forming process is interrupted.
- This problem is particularly serious when more complex reshaping is to be carried out, for example to shape sheet metal, e.g.
- a device and a method for hydroforming are known, in which the locking force necessary to compensate for the internal pressure is arranged below a press table
- the locking force can also be precisely determined according to the requirements on the workpiece by appropriate wiring and control of the cylinders.
- this is provided with structural stiffeners in the form of wall thickness increases.
- the size, complexity and weight of the tool carrier increase considerably, so that on the one hand, the purchase, installation and operation of such devices are complex and cost-intensive, and on the other hand the aforementioned high demands on the sealing surfaces for sealing the forming chamber during forming complex three-dimensional sheet geometries cannot be met.
- DE 197 16 663 Cl discloses a device for the hydrostatic shaping of cold-formable metallic flat material, in which the sheet metal body to be shaped is received between two die plates, one of which has an engraving corresponding to the desired shape, with a vertically movable one on the top die plate stored press ram acts.
- at least one of the two die plates is designed to be flexible, and a hydraulically passive layer which is clamped on all sides is arranged between the flexible die plate and the press ram.
- a device for carrying out a hydroforming which has a pressure container arranged in a frame, which comprises upper and lower container parts, each of which carries molded parts therein.
- a mold cavity is formed between the mold parts, in which a workpiece to be machined by means of hydroforming is arranged.
- an inflatable bellows into which a pressurized fluid is also introduced during the application of a pressure fluid to the mold cavity in order to prevent the molded parts from drifting apart.
- this device has the disadvantage, on the one hand, that the flexible materials required to form the flexible bellows, when high pressures are applied, have the property that they can penetrate into any gaps of the device, however small.
- a gap between the container part and the respective molding be considered structurally, so that the flexible, inflatable bladder during the hydroforming forming in the gap incorporate can and will be destroyed sooner or later.
- elastic deformations of the respective container part are transferred to the adjacent molded part via the flexible bellows, so that the required precision positive locking of the tool halves is no longer guaranteed at correspondingly high pressures. This applies in particular if, as described above, complex sheet metal geometries are formed, since with the three-dimensionally curved sealing surfaces then necessary, the flexible bellows is insufficient to compensate for the elastic deformations mentioned.
- the object of the invention is therefore to create a device and a method for hydroforming, in which or by means of which complex three-dimensional sheet metal geometries can be realized while ensuring a shaping process which runs smoothly. This object is achieved in accordance with the features of the independent claims.
- a device for hydroforming comprises
- At least one tool which is divided into two tool halves along a tool parting plane, the two tool halves forming at least one molding chamber which can be acted upon with a hydrostatic internal pressure for shaping on a workpiece to be formed,
- a tool carrier which has at least one tool carrier component assigned to each tool half, each pair comprising the tool carrier component and
- Tool half is assigned at least one fluid chamber, which is formed from a piston component and a piston receiving component, and wherein means for generating a hydrostatic pressure which is at least the same size as the hydrostatic internal pressure
- Fluid chamber pressure is provided in each of the fluid chambers, which exerts a tool closing force on the two tool halves while compensating for the hydrostatic internal pressure.
- the device and the method according to the invention also have the advantage that fluid chambers of several tool carrier components can also be connected in a network, which means that devices with considerable installation space sizes of many
- Meters in length and high locking forces can be generated, which is particularly important when forming very large blanks, e.g. is important for facade panels in the construction sector, but also for aviation, shipping and rail transport.
- At least one pair consists of piston component and associated one Piston receiving component formed by two tool carrier matrices of the respective tool carrier component.
- at least one pair of piston component and associated piston receiving component can also be formed by a tool carrier component and the associated tool halves.
- the associated tool carrier die for forming the piston component with piston-like projections in the case of at least one tool carrier component, the associated tool carrier die for forming the piston component with piston-like projections and the other
- each pair of cavities or piston-like protrusions can each enclose a fluid chamber, or it can have a single common one
- Fluid chamber are formed by using the entire area remaining between the cavities and the piston-like projections as a hydraulically acting surface.
- means for guiding the tool carrier components in the IHU device e.g. along a frame in the hydroforming device.
- each tool half is assigned at least two adjacent fluid chambers, a plurality of fluid chambers arranged in a matrix-like manner being preferably provided on opposite tool sides.
- the device according to the invention has great flexibility with regard to the positioning of the tool halves in the tool carrier, since the fluid chambers, for example top and bottom, are in synchronism with one another can be coordinated, applied jointly or only partially with the hydrostatic external pressure. In this way, in order to achieve a uniform locking force distribution, neither a central positioning of the tool nor a certain minimum size of the
- two fluid chambers assigned to different tool halves are arranged opposite one another, so that it is ensured that, when the respective opposite fluid chambers are acted on identically, an equally large fluid chamber pressure is generated on both sides.
- each pair of piston component and associated piston receiving component forms a sealing unit that closes each fluid chamber in a pressure-tight manner.
- only the outer edge area of the respective tool carrier component can be sealed, so that the entire space remaining within the seal between the tool carrier matrices of the tool carrier component can be used as a hydraulically acting surface.
- the fluid chambers can each have a round, oval or any other, e.g. have triangular or square cross-section.
- the means for generating the hydrostatic fluid chamber pressure are like this designed that the fluid chambers can be partially and / or jointly acted upon with the same or different fluid chamber pressure. This allows maximum flexibility with regard to the positioning of the tool between the
- the means for generating the hydrostatic fluid chamber pressure are designed such that the fluid chamber pressure generated in the fluid chambers lying opposite one another is identical in each case.
- the means for generating the fluid chamber pressure are, however, even more advantageously designed such that the forces exerted by the fluid chamber pressure on the two tool halves are opposite and of the same magnitude.
- a control circuit for regulating the hydrostatic fluid chamber pressure as a function of the force exerted on the respective tool half is provided.
- deviations in the size of the active surfaces of the tool carrier components can be compensated, for example as a result of manufacturing-related tolerances, so that a defined force is exerted on the relevant tool half regardless of the size of the respective active surface.
- a mold element is provided in the tool parting plane between the two tool halves of the tool, which forms with each of the tool halves a mold chamber which can be acted upon by a hydrostatic internal pressure for shaping on a workpiece to be formed in each case.
- the feature is preferably mirror-symmetrical in relation to the tool parting plane.
- Molding chambers giving shape in relation to the workpiece located in the mold chamber.
- the shaped element is fastened between the tool halves on a frame carrying the tool carrier.
- This configuration is particularly advantageous since, in order to equip the hydroforming device with workpieces to be machined, or to remove them after the forming process, the two tool halves or the associated tool carrier components can simply be pushed apart in the vertical direction while the shaped element is in its defined position Position remains.
- the shaped element can also be pressure-tightly encompassed by the tool halves, especially between the two Tool halves must be floating.
- the “floating” bearing is to be understood here in relation to the vertical direction facing the respective tool halves, ie the shaped element that is enclosed by the tool halves or enclosed by them in a pressure-tight manner can be displaced in this vertical direction, whereas it is encompassed in the horizontal direction by the tool halves and consequently maintains a defined position.
- a plurality of tools with a shaped element provided in the tool parting plane between the respective tool halves are arranged adjacent in the direction perpendicular to the tool parting plane.
- a mold element is provided in the tool parting plane of at least one of the tools between the respective tool halves, which forms with each of the respective tool halves a molding chamber which can be acted upon by a hydrostatic internal pressure for shaping on a workpiece to be formed in each case.
- the tool carrier is integrated in a clamping table (press table) for clamping the tool halves.
- a clamping table press table
- a plurality of tools are included Tool separating planes arranged in a vertical direction in a stack arrangement,
- the forming chamber is in fluid-conducting connection with the surroundings of the tool arrangement via the respective adjacent tool halves, so that pressure build-up in the forming chamber is prevented when the pressure chamber is pressurized.
- the number of pieces of workpieces to be formed per work step is increased, since several workpieces can be formed simultaneously in the IHU tool arrangement with each forming cycle.
- the forming can be carried out particularly easily since pressure build-up in the forming chambers is effective during each forming process, i.e. during the application of hydrostatic internal pressure to the pressure chambers is prevented.
- pressure build-up in the forming chambers is effective during each forming process, i.e. during the application of hydrostatic internal pressure to the pressure chambers is prevented.
- particularly large numbers of workpieces can be produced per work step, which significantly increases the economy of the arrangement. This significantly reduces the disadvantage of relatively long cycle times, which is common in hydroforming compared to conventional processes such as deep drawing or embossing.
- Such an IHU tool arrangement is particularly suitable for use in the device described above
- Suitable for internal high-pressure forming can also be used in a conventional hydroforming device in which the locking force required to compensate for the internal pressure is generated, for example, by means of cylinder packs arranged below the press table.
- An application in a conventional hydroforming device is particularly suitable if, instead of complex three-dimensional sheet metal geometries, workpieces with an essentially flat geometry are to be produced.
- the tool half adjoining the respective forming chamber has outlet openings which extend from the surroundings of the tool to the respective forming chamber, in order to ensure the fluid-conducting connection between the respective forming chamber and the surroundings of the tool arrangement.
- the outlet openings preferably comprise at least one outlet channel extending parallel to the tool parting plane and a plurality of outlet channels arranged perpendicularly thereto.
- the tool half adjoining the respective forming chamber is subdivided along the tool parting plane into at least two separate components, each of which has outlet openings extending perpendicular to the tool parting plane towards the respective forming chamber.
- the stack arrangement is such that, in an alternating sequence, one tool half forming a forming chamber with the adjacent workpieces and one tool half forming a pressure chamber with the adjacent workpieces are arranged perpendicular to the tool parting plane.
- At least one of the tool halves forming a pressure chamber with the adjacent workpieces has a fluid channel which branches off in the direction of the two workpieces in order to act upon the pressure chambers with the hydrostatic internal pressure. This ensures that the respective with the branched fluid channel in connection standing pressure chambers can be acted upon in a particularly simple manner with identical hydrostatic pressure.
- At least one of the tool halves forming a pressure chamber with the adjacent workpieces has two fluid channels branching off in opposite directions for the independent application of the respective pressure chambers to the hydrostatic internal pressure. This ensures that the respective pressure chambers are connected to separate fluid channels and can therefore be subjected to different hydrostatic pressures.
- the stacking arrangement is such that a pressure chamber and a forming chamber are formed in alternating succession perpendicular to the tool parting plane.
- Hydroforming is applied in at least one mold divided into two tool halves along a tool parting plane to at least one mold chamber formed by the tool halves for shaping on a workpiece to be reshaped with a hydrostatic internal pressure, and in each case one of the tool halves assigned to fluid chambers formed from a piston component and a piston receiving component generates a hydrostatic fluid chamber pressure which is at least equal to the internal pressure and which, while compensating for the hydrostatic internal pressure
- Tool clamping force exerts on the two tool halves.
- a plurality of adjacent fluid chambers are partially and / or jointly acted upon on opposite sides of the tool with the same or different fluid chamber pressure.
- the hydrostatic fluid chamber pressure is regulated as a function of the force which is exerted on the respective tool half by the fluid chamber.
- two opposing mold chambers are arranged in the tool, each of one of the tool halves with one in the tool parting plane between the two
- Mold halves of the mold arranged element are formed, at the same time acted upon by a hydrostatic internal pressure.
- the shaped element is preferred in relation to the
- the tool parting plane is arranged in mirror symmetry and the two mold chambers are simultaneously subjected to identical hydrostatic internal pressure to form two identical components from workpieces to be reshaped.
- Mold elements provided mold elements a plurality of mold chambers, each with one of the tool halves one of the shaped elements are formed, simultaneously subjected to a hydrostatic internal pressure.
- an IHU tool arrangement in which a plurality of tools, each divided into two tool halves along a tool parting plane, are arranged in a stack arrangement in a direction perpendicular to the tool parting planes, the tool arrangement equipped with a workpiece to be formed between two adjacent tool halves, so that a pressure chamber is formed from the workpiece and one tool half and a forming chamber is formed from the workpiece and the other tool half;
- Each of the pressure chambers for shaping the respective workpiece with a hydrostatic internal pressure and when pressure is applied to the pressure chamber, pressure build-up in the forming chamber is prevented via at least one fluid-conducting connection between the respectively adjacent tool half and the surroundings of the tool arrangement.
- Figure 1 is a schematic side view in partial section of an inventive device for hydroforming (IHU device);
- FIG. 2 shows a cross-sectional view along the section line “A-A” of the lower tool carrier component of the hydroforming device from FIG. 1;
- FIGS. 3a and 3b are perspective views of the lower tool carrier component of the hydroforming device from FIG. 1;
- Figure 4a-d different preferred embodiments of a tool carrier die used in the IHU device of Figure 1 in plan view;
- FIG. 5 shows a cross-sectional view of an alternative embodiment of a tool carrier component for the IHU device according to the invention
- FIG. 6 and 7 are schematic representations to explain the principle on which the hydroforming device according to the invention is based without (FIG. 6) or with (FIG. 7) exposure to hydrostatic pressure;
- FIG. 8 shows a schematic illustration of a section of an IHU device in which a tool according to a further preferred embodiment is provided;
- FIG. 9 shows a schematic cross-sectional view of a composite of two tool carriers for an IHU device; 10a-d show different embodiments of IHU tool arrangements according to a further aspect of the invention.
- a device according to the invention for hydroforming (IHU device) 1 in a preferred embodiment comprises a tool holder 2 which comprises an upper tool holder component 3 and a lower tool holder component 4.
- the tool carrier 2 is held by a frame (not shown here), the frame according to FIG. 9 being known, e.g. can be constructed from horizontal connecting rods attached to vertically arranged slats.
- Tool carrier components 3, 4 of the tool carrier 2 are then guided on the vertical steel slats of the frame so that they can be moved and locked in the vertical direction.
- the lower tool carrier component can be integrated in a clamping table (press table) of the hydroforming device 1.
- the tool carrier components 3, 4 each have an upper tool carrier die 3a or 4a and a lower one
- Tool carrier die 3b or 4b A tool 5, which comprises an upper tool half 5a and a lower tool half 5b, is mounted between the tool halves 3, 4.
- the lower tool half 5b has an approximately centrally arranged recess on its side facing the upper tool half 5a, so that with tool halves 5a, 5b lying flat on one another, a molding chamber 6 is formed in which a workpiece 7 to be formed is formed is arranged.
- the molding chamber 6 is designed in accordance with the desired shape of the formed workpiece and can also be provided at any other point between the tool halves 5a, 5b.
- the tool half 5a furthermore has a fluid channel which is connected to the mold chamber 6 and leads laterally outwards within the tool half 5a (as shown in FIG. 6).
- a preferably incompressible fluid e.g. water or oil
- a hydraulic pump via the fluid channel, as a result of which an internal high pressure Pi required for the shaping of the workpiece 7 is generated.
- a force Fa acting on the tool halves 5a, 5b from the outside is required, the condition Fa ⁇ Fi having to be fulfilled during the entire forming process.
- Tool carrier component 4 in each case a plurality of fluid chambers 8 arranged in a matrix, which in the preferred embodiment shown are arranged such that a fluid chamber 8 in the lower tool half 4 and a fluid chamber 8 in the upper tool half 3 lie opposite each other in a line of force.
- each tool carrier component 3, 4 each comprises a 3 ⁇ 6 matrix of fluid chambers 8, however any number of fluid chambers 8 can be provided.
- the top and bottom include
- Tool carrier component 3 but preferably at least two adjacent fluid chambers 8 each, so that the flexibility with regard to the positioning of the tool when equipping the hydroforming device can be increased by partially controlling them.
- Each of the fluid chambers 8 is formed according to FIG. 1 (lower right part), as well as FIGS. 2 and 3, in that the tool carrier matrices 4a, 4b of the lower tool half 4 have mutually corresponding positive or negative shaped and essentially form-fitting interlocking die contours.
- the upper tool carrier die 4a forms a piston receiving component
- the lower tool carrier die 4b forms a corresponding piston component.
- the upper tool carrier die 4a comprises a matrix-like arrangement (in the The exemplary embodiment shown is a 3x6 matrix) of essentially cylindrical cavities 13 which are open towards the side facing the lower tool carrier die 4b, whereas the lower tool carrier die 4b as a piston component has a corresponding matrix-like shape
- Arrangement (in the illustrated embodiment also a 3x6 matrix) comprising piston-like projections 14 corresponding to the cavities 13.
- the piston-like projections 14 of the lower tool carrier die 4b are arranged at the corresponding positions as the cavities 13 of the upper tool carrier die 4a, so that the lower and the upper tool carrier components 4a, 4b engage in one another essentially in a form-fitting manner.
- the position of the cavities 13 or the piston-like projections 14 can also be exchanged in relation to the embodiment shown in FIGS. 3a, 3b in such a way that the cavities 13 in the lower one
- Tool carrier die 4b of the lower tool carrier component 4 (or in the upper tool carrier die 3a of the upper tool carrier component 3) are provided.
- the lower tool carrier die 4b for forming fluid channels 9 preferably has cylindrical bores, which in the exemplary embodiment shown are each arranged centrally in the respective piston-like projections 14 and extend from the side of the respective piston-like projection 14 to which faces the corresponding cavity 13 extend to the side of the lower tool carrier die 4b facing away from the cavity 13.
- the bores for forming the fluid channels 9 can also be designed in a corresponding manner in the upper tool carrier die 4a, that is to say from the outside leading to the cavities 13.
- each cavity 13 comprises a groove 11 which, in the engaged state of the lower and upper tool carrier die 4a, 4b, extends concentrically around the corresponding piston-like projection 14 and in which a sealing ring 12 is received to form a seal 10, so that the one through
- At least one pair of piston component and associated piston receiving component for forming the fluid chambers 8 can also be formed by a tool carrier component and the associated tool halves.
- the tool carrier component in question can be formed in one piece and have piston-like projections 14 according to FIGS Tool halves 5a and 5b are provided.
- This type of formation of the fluid chambers 8 can be selected on only one or on both sides of the tool.
- the cavities 13 can alternatively also be provided in the respective tool carrier component and the piston-like projections 14 in the corresponding tool half 13.
- a preferably incompressible liquid can be supplied to the intermediate space remaining between the piston-like projections 14 and the corresponding cavities 13 in order to provide the fluid chambers 8 formed there with a hydrostatic fluid chamber pressure To apply Pa.
- the piston-like projections 14 of the lower tool carrier die 4b and the corresponding cavities 13 of the upper tool carrier die 4a do not necessarily have to be cylindrical, but can have any surface shape.
- An upper tool carrier die 15 is shown as an example in FIG. 4a, in which an inner partial region 15 ′′ which can be acted upon by hydrostatic pressure is divided from an outer partial region 15 ′ via a seal 15a of elongated, rounded surface shape.
- FIG. 4b, c and d show further possible embodiments of tool carrier matrices 16, 17 and 18, partial areas 16 ′′, 17 ′′ and 18 ′′ which can be acted upon by hydrostatic pressure via seals 16a, 17a and 18a in each case from outer partial areas 16 ', 17' and 18 'are divided and the respective partial areas 16 ", 17" and 18 "which can be subjected to hydrostatic pressure have an oval (FIG. 4b), hexagonal (FIG. 4c) or irregular (FIG. 4d) surface shape ,
- Locking force Fa necessary hydrostatic fluid chamber pressure Pa takes place by supplying a preferably incompressible fluid such as water or oil using a conventional one Hydraulic pump or the like, whereby the fluid chambers 8 can be partially, ie independently of one another, but also acted upon together with the same or different fluid chamber pressure Pa.
- a preferably incompressible fluid such as water or oil
- a conventional one Hydraulic pump or the like whereby the fluid chambers 8 can be partially, ie independently of one another, but also acted upon together with the same or different fluid chamber pressure Pa.
- the fluid chambers 8 can be controlled depending on the position of the tool halves 5a, 5b in the tool carrier 2, so that in particular no central positioning of the tool 5 is necessary.
- a uniform force distribution can also be produced for each position of the tool 5, without this requiring a minimum size of the tool carrier 2.
- the hydraulic pump is preferably designed to act on the fluid chambers 8 in such a way that it flows into each other fluid chamber pressure Pa generated opposite a line of force is identical. In this way, it is ensured with relatively little design effort that, with identical hydrostatic pressurization of the fluid chambers 8, the same hydrostatic fluid chamber pressure is generated on both sides of the tool 5.
- control loop can also compensate for any decrease in pressure in the fluid chambers 8 that may occur during the forming process, since the fluid is then regulated in a controlled manner via the fluid channels 9 and the pressure in the fluid chambers 8 or the force Fa exerted on the tool 5 is kept constant ,
- the control loop is preferably set such that that of the lower tool carrier die 3b of the upper tool carrier component 3 and that of the upper tool carrier die 4a of the lower tool carrier component 4 onto the respective tool half 5a and 5b are opposed forces and are the same size.
- the inventive design of the fluid chambers 8 by the corresponding and essentially interlocking interlocking cavities 13 or piston-like projections 14 present in the respective tool carrier matrices 3a, 3b, 4a and 4b also has the effect that with a relative movement of the respective tool carrier matrices 3a and 3b, or 4a and 4b, an integrated guide is formed, which ensures a largely defined direction of movement of the tool carrier dies 3a, 3b, 4a and 4b, without further constructional measures being necessary, which is also necessary for maintaining the trouble-free forming process
- FIG. 5 is an alternative embodiment of a tool carrier component 19 with an upper tool carrier die 19a and a lower one
- the fluid chamber 20 can be acted upon evenly from the outside with a preferably incompressible hydraulic fluid via fluid channels arranged in each piston-like projection.
- a seal 22 is only provided in the outer edge region of the tool carrier component 19.
- the seal 22 can be arranged, for example, in a circumferential groove which surrounds the entire fluid chamber 20. Thus, the whole comes from the seal 22 enclosed area between the upper and lower tool carrier components 19a, 19b as a hydraulically acting surface.
- the interlocking piston-like projections and cavities of the tool carrier components 19a, 19b in turn bring about an integrated guidance of the relative movement of the two tool carrier components 19a, 19b during the hydraulic loading.
- FIG. 6 a detail 1 'of the hydroforming device 1 from FIG. 1 is shown without (FIG. 6) or with (FIG. 7) application by means of hydrostatic pressure, the elements of the hydroforming device 1 corresponding to FIG. 1 being shown with the same reference numbers.
- cutouts 3 ', 4' of the tool carrier components 3, 4 with corresponding cutouts 3a ', 3b', 4a ', 4b' of the corresponding tool carrier matrices 3a, 3b, 4a, 4b are shown schematically in FIGS. 6 and 7, the cutouts being chosen in this way are that a respective fluid chamber 8 with an associated fluid channel 9 is shown.
- Tool carrier components 3, 4 in turn show a tool 5 with upper and lower tool halves 5a, 5b, a fluid channel 23 leading to the molding chamber 6 in the manner described above also being shown.
- FIG. 7 shows the effects of introducing a hydrostatic internal pressure Pi into the mold chamber 6 and a hydrostatic fluid chamber pressure Pa into the Fluid chambers 8 shown schematically.
- the internal pressure Pi generated in the molding chamber 6 as a result of the application of the molding chamber 6 via the fluid channel 23 is distributed evenly over the conversion of the molding chamber 6 and leads to an outward force Fi on the tool halves 5a, 5b, as is shown by the double arrows within the Shaping chamber 6 is shown.
- Tool carrier component 3, 4 generated hydrostatic fluid chamber pressure Pa evenly on the conversions of the fluid chambers 8 within the fluid chambers 8, which is also represented by double arrows. It must be ensured here that the force Fa corresponding to the hydrostatic fluid chamber pressure Pa is always greater than or equal to the force Fi corresponding to the hydrostatic internal pressure Pi during the entire forming process, so that the necessary precision interlocking of the tool halves 5a, 5b remains guaranteed.
- FIG. 8 a section of an IHU device according to the invention is shown schematically, in which a tool 5 'according to a further preferred embodiment is provided.
- the other components corresponding to the hydroforming device from FIG. 6 are identified by corresponding reference numerals.
- the tool 5 ' is designed such that a shaped element 5'c is provided in the tool parting plane between the two tool halves 5'a, 5'b of the tool 5'.
- the shaped element 5'c can have, for example, the surface geometry shown in FIG. 8 or any other surface geometry, depending on the desired surface geometry of the workpiece to be formed in each case.
- the shaped element 5'c forms with each of the
- Tool halves 5'a, 5'b each with one for shaping on a workpiece to be formed (not shown) a hydrostatic internal pressure Pi from mold chamber 6a or 6b.
- the tool halves 5'a, 5'b preferably have end faces facing the shaped element 5'c in accordance with the embodiment shown in FIG. 8 Shoulders, seals (not shown) being provided between these shoulders and the adjacent end sections of the molding element 5'c.
- the conversion of each mold chamber 6a, 6b is formed by the end shoulders provided on the tool halves 5'a, 5'b and the mutually facing side surfaces of the respective tool halves 5'a, 5'b and the mold element 5'c.
- both molding chambers 6a, 6b are analogous to the embodiment shown in FIG. 6 via fluid channels 23a, 23b, which e.g. are connected to a hydraulic pump (not shown), can be acted upon by an internal hydraulic pressure Pi.
- the opened hydroforming device is equipped with a workpiece (not shown) between the shaped element 5'c and the associated tool halves 5'a or 5'b, whereupon the two tool halves 5 'a, 5'b are brought into contact with the molding element 5'c at the end portions thereof, so that the molding chambers 6a, 6b form.
- the forming process is then carried out by hydraulic action on the molding chambers 6a, 6b via the fluid channels 23a, 23b analogously to the embodiment shown in connection with FIGS. 6 and 7. While As already described above, this forming process generates a hydrostatic external pressure Pa in the fluid chambers 8 which compensates for the hydrostatic internal pressure Pi in the molding chambers 6a, 6b, so that the required
- Each of the molding chambers 6a and 6b is subdivided into a pressure chamber and a shaping chamber when the tool is equipped with workpieces to be shaped by the respective workpiece. While the pressure chamber facing the respective fluid channel 23a, 23b is acted upon by the hydrostatic internal pressure Pi, the shaping takes place in the deforming chamber located on the opposite side of the workpiece.
- the shaped element 5'c preferably has outlet openings (not shown), as will be explained in more detail in connection with FIGS. 11a-c.
- the shaped element 5'c itself is preferably fastened to the frame which also carries the tool carrier 2.
- the molding element 5'c is constructed mirror-symmetrically with respect to the mold parting plane, so that the molding chambers have the same geometry 6a, 6b can form.
- both mold chambers 6a, 6b can be acted upon in a simple manner with identical hydrostatic internal pressure Pi, so that in one Manufacturing step two matching components are formed.
- the IHU device according to the invention can also be used to interconnect the fluid chambers of several tool carrier components in a network, as a result of which devices with considerable installation space sizes of many meters in length and high locking forces are obtained.
- FIG. 9 shows the tool carrier 2 from FIG. 1 in a combination with a further, identically constructed tool carrier 24 with tool carrier components 25, 26, each of the tool carriers 2, 24 being mounted in a frame 27 and 28, respectively.
- the lower ones are the lower ones.
- Tool carrier components 4 and 26 of tool carriers 2, 24 are preferably each integrated in a clamping table (press table).
- Each of the frames 27 and 28 is constructed from horizontal connecting rods 31 and 32 attached to vertical slats 29 and 30, respectively, the slats 29, 30 and the connecting rods 31, 32 e.g. can be made of steel.
- the tool carrier components 3 and 4 or 25 and 26 of the tool carrier 2 and 24 are in turn movable on the vertical slats 29 and 30 in the vertical direction via guides, not shown, and can be locked in any position and, in addition, correspond to the tool carrier components 3 and 4 1 to 3 embodiment shown.
- the two frames 27 and 28 are set up adjacent to one another in such a way that the frames accommodated therein Tool carrier components 3 and 25 or 4 and 26 are each arranged adjacent to one another.
- the two tool carriers 2 and 24 form a functional unit insofar as they form a continuous tool carrier with a correspondingly enlarged horizontal cross-sectional area. In this way, an IHU device network is created from individual IHU devices that form a functional unit.
- Tool carrier 2 and 24 is in turn a tool 33 divided into tool halves 33a, 33b, the tool halves 33a, 33b forming a molding chamber 34 which can be acted upon by the hydrostatic internal pressure Pi via a fluid line 36 leading to a schematically indicated hydraulic pump 35.
- the hydraulic pump 35 also serves to apply the hydrostatic fluid chamber pressure Pa to the fluid chambers 8.
- the tool 33 in the composite of tool carriers 2, 24 shown in FIG. 9, as well as the molding chamber 34 formed therein, can have an enlarged cross-sectional area parallel to the horizontal connecting rods 31, 32 relative to the individual tool carrier 2, so that now correspondingly larger ones Have sheet metal geometries processed.
- FIG. 10a-10d different designs of tool arrangements 40-70 according to the invention are shown, in which a larger number of workpieces can be formed in a single production step, which considerably increases the economy of the corresponding IHU device.
- a plurality of tool components 41, 42, 45 and 46 are arranged in a stack arrangement in a tool arrangement 40 in the direction perpendicular to the tool separation planes, two adjacent tool components such as, for example, that
- Tool components 41 and 45 or 45 and 46 can be regarded as tool halves of one of several tools of the tool arrangement 40.
- the tool halves 41, 42, 45 and 46 are designed in such a way that tool components 41, 42 are arranged at the upper and lower ends of the stacking arrangement 40, each of which has a fluid channel 43 analogous to the embodiment shown in FIGS. 6 and 7 and have a seal 44 (only shown schematically).
- tool components 41, 42 Arranged in alternating succession between tool components 41, 42 are tool components 45 which form on both sides and tool components 46 which are provided with a fluid supply on both sides, each pair of adjacent tool components 45, 46 each representing a tool.
- the tool components 46 which are provided with a fluid supply on both sides, each have a fluid channel 47 branching in a “T-shaped” manner in the direction of the adjacent tool components 45 and a schematically illustrated seal 48.
- the seals 44 and 48 can be configured in any manner as long as it is ensured that the pressure chambers "A" are sealed in a fluid-tight manner when the tool arrangement 40 is closed. Alternatively, however, the seals 44 and 48 can also be dispensed with, in which case the Tool arrangement 40 if necessary from the Pressure chambers "A" emerging fluid is tracked via the fluid channels 43 and 47.
- the tools formed from the tool components or tool halves 45, 46 are each equipped according to FIG. 10a with a workpiece 49 arranged in the associated tool parting plane, the workpieces 49 to be formed according to FIG. 10a being in the form of flat sheets.
- each workpiece 49 and one tool half for example the uppermost tool component 21, become one for shaping on the workpiece 49 with a hydrostatic internal pressure (Pi) pressure chamber "A ⁇ and formed by the workpiece 49 and the other tool halves, in the example of the tool component 45, a forming chamber" B ".
- the "T-shaped" branching of the fluid channels 47 ensures that the respective adjacent pressure chambers "A" are acted upon by an identical hydrostatic internal pressure Pi.
- each forming chamber “B” is in a fluid-conducting connection to the outer surroundings of the tool arrangement 40 via (not shown) outlet openings in the adjacent tool half.
- outlet openings have the effect that, when the pressure chamber “A ⁇ is pressurized, pressure builds up in the adjacent forming chamber “B ⁇ N prevented becomes. In this way, the shaping of the workpiece 49 is facilitated, since the movement of the workpiece 49 during the shaping in the direction of the shaping chamber “B ⁇ does not lead to the build-up of a counterpressure in spite of the associated reduction in volume in the shaping chamber“ B ”.
- the embodiment of a tool arrangement 50 shown in FIG. 10b is such that perpendicular to the tool parting plane in alternating succession one tool half with the adjacent workpieces 49 and 59, respectively, forming a forming chamber “B ⁇ and one with Tool halves forming a pressure chamber “A” are arranged adjacent to the adjacent workpieces 49 and 59, respectively.
- the tool arrangement 50 has the same sequence of pressure chambers "A” and forming chambers "B", namely "... ABBA ".
- the embodiment of a tool arrangement 50 shown in FIG. 10b thus essentially corresponds to the tool arrangement 40 from FIG 10a, so that the corresponding components are provided with corresponding reference numerals.
- the fluid-supplying tool components 56 each have two separate fluid channels 57a, 57b, which branch off in opposite directions of the fluid-supplying tool components 56, namely in each case towards the adjacent workpieces 59.
- the respective adjacent pressure chambers "A" can thus be acted upon with different hydrostatic pressure via the fluid channels 57a, 57b.
- tool components or tool halves 45 and 55 are not necessarily in one piece formed, but can also be divided into several pieces, in particular approximately along the tool parting plane in two or more tool component elements. Such a division into separate tool component elements has the advantage that the above-mentioned (not shown)
- Outlet openings in the tool components 45 and 55 to prevent pressure build-up in the forming chambers “B” can be manufactured more easily in terms of production technology, since for this purpose outlet channels to be provided perpendicular to the tool parting plane must have a correspondingly reduced length.
- the two tool halves located between two shaped elements, each associated with the adjacent shaped elements can also be formed as separate components or as one piece.
- Exemplary embodiments of tool components 100, 200 and 300 are shown in Fig. Lla-c.
- these outlet openings can comprise, for example, an outlet channel 101 extending parallel to the tool parting plane and a plurality of outlet channels 102 arranged perpendicularly thereto.
- Such outlet channels 101, 102 can ensure that when the tool component 100 used in a hydroforming device according to the invention is equipped with a workpiece in the region between the workpiece and the adjacent tool half, pressure build-up is prevented if the one formed on the opposite side of the workpiece
- outlet channels 101, 102 can, depending on the special requirements, in particular depending on the geometry or Dimensions of the workpieces to be reshaped have different dimensions or geometries, it being possible, for example, for outlet channels 101, 102 in the form of cylindrical bores with a bore diameter in the range from 0.1 mm to 1 mm to be suitable.
- FIG. 11b an embodiment of a tool component 200 is shown in FIG. 11b, which has a shaping only on one side, i.e. has a shaping engraving on only one side for forming a workpiece in the hydroforming device.
- an outlet channel 201 extending parallel to the tool parting plane is provided, from which a plurality of outlet channels 202 arranged perpendicularly thereto extend in the direction of the shaping side.
- a fluid channel 203 extends to the side of the tool component 200 opposite this shaping side in order to form a fluid-supplying side, a seal 204 also being provided analogously to the previously described embodiments.
- FIG. 11c an embodiment of a tool component 300 is shown, which is divided into two parts along the tool parting plane, that is to say is formed in two pieces. Otherwise, the tool component 300 is formed on both sides analogously to the tool component 100 from FIG. 11a, that is to say it has, in particular, outlet channels 301, 302 which extend towards both mutually opposite shaping sides.
- the two-part embodiment of the tool component 300 is particularly advantageous in terms of production technology, since the outlet channels 301, 302 which run perpendicular to the tool parting plane are of short, in particular only half, length how the corresponding outlet channels 102 of the tool component 100 must be designed.
- an upper tool component 61 and a lower tool component 62 are provided on one side in the direction of the lower tool component 62, the lower tool component 62 having a seal 63 and a fluid channel 64 in the direction of the upper tool component 61.
- a plurality, in the exemplary embodiment a total of five, identical tool components 65 are arranged in a stack in the direction perpendicular to the tool parting plane.
- Each of the tool components 65 has a fluid channel 66 which extends in the direction of the upper tool component and a seal 67 which is likewise arranged in this direction.
- the tool arrangement 60 is also equipped with workpieces 68 arranged in the respective tool parting planes, so that one pressure chamber “A” and one in alternating succession perpendicular to the tool parting plane between the workpieces 68 and the tool components 61 and 65, 65 and 65 or 65 and 62 Forming chamber “B” are formed.
- the sequence between pressure chambers "A” and forming chambers “B” can thus be described schematically as “... A-B-A-B ... in the tool arrangement 60 shown in FIG. 10c.
- Tool separating plane can be arranged in a vertical direction in a stack arrangement.
- Tool assembly 70 has an upper tool component 71 and a lower tool component 72.
- the tool components 71, 72 face each other a fluid channel 73 and 75 and one each
- a tool component 78 which has a fluid channel 79 which extends in the direction of this tool component 77 and a seal 80 which also points in this direction and is formed on one side to form a shape on the side facing away from this direction,
- the stack arrangement is selected such that when the tool arrangement 70 is equipped with workpieces 86, a pressure chamber “A” or a forming chamber “B is again formed on opposite sides of the workpiece
- the stacking sequence of pressure chambers “A ⁇ and forming chambers“ B ”in the tool arrangement 70 is referred to as irregular, namely in the exemplary embodiment shown as“ ABBABAABBAB-AABBA ”.
- the one-sided shaping tool components or the two-sided shaping tool components can have any engraving of the surface in question on the respective shaping side for shaping.
- the individual mold chambers or the fluid channels connected to them can be supplied with the necessary hydrostatic internal pressure from different or from a common pressure source (eg hydraulic pump). Furthermore, these mold chambers and the fluid chambers 8 provided in the tool carrier 2 for generating the necessary locking force Fa can be acted upon with a uniform pressure from the same pressure source, which in turn ensures that, due to the larger effective surfaces of the tool carrier matrices 3b, 3b 'and 4a, 4a 'The locking force Fa is always greater than the force Fi acting in the mold chambers.
- separate pressure sources can also be used to act on the mold chambers and the fluid chambers 8.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Stored Programmes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK01270389T DK1341623T3 (en) | 2000-12-12 | 2001-12-03 | Apparatus and method for internal high pressure molding and tool tool for internal high pressure molding |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10061884 | 2000-12-12 | ||
DE10061884 | 2000-12-12 | ||
DE10137476A DE10137476A1 (en) | 2000-12-12 | 2001-08-02 | Process and device for hydroforming |
DE10137476 | 2001-08-02 | ||
PCT/DE2001/004492 WO2002047839A1 (en) | 2000-12-12 | 2001-12-03 | Internal high pressure forming device and method and corresponding tool system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1341623A1 true EP1341623A1 (en) | 2003-09-10 |
EP1341623B1 EP1341623B1 (en) | 2005-03-23 |
Family
ID=26007945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01270389A Expired - Lifetime EP1341623B1 (en) | 2000-12-12 | 2001-12-03 | Internal high pressure forming device and method and corresponding tool system |
Country Status (7)
Country | Link |
---|---|
US (1) | US20040103707A1 (en) |
EP (1) | EP1341623B1 (en) |
AT (1) | ATE291507T1 (en) |
AU (1) | AU2002219003A1 (en) |
CA (1) | CA2440722A1 (en) |
ES (1) | ES2240334T3 (en) |
WO (1) | WO2002047839A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10334660B3 (en) † | 2003-07-30 | 2004-11-04 | Theodor Gräbener GmbH & Co. KG | Device for producing molded parts comprises a housing formed by pipes which are connected together by shrinking, and a tool support unit consisting of half-shells and inserted into the hole of the inner pipe |
KR20070112414A (en) | 2005-03-17 | 2007-11-23 | 인더스트리얼 오리가미, 엘엘씨. | Precision-folded, high strength, fatigue-resistant structures and sheet therefor |
TW200833434A (en) * | 2006-09-04 | 2008-08-16 | Ind Origami Inc | Apparatus for forming large-radii curved surfaces and small-radii creases in sheet material |
EP2079554A2 (en) | 2006-10-26 | 2009-07-22 | Industrial Origami, Inc. | Method of forming two-dimensional sheet material into three-dimensional structure |
BRPI0807526A2 (en) | 2007-02-09 | 2014-06-10 | Ind Origami Inc | THREE-DIMENSIONAL BEARING FRAME |
US8936164B2 (en) * | 2012-07-06 | 2015-01-20 | Industrial Origami, Inc. | Solar panel rack |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR919836A (en) * | 1946-01-08 | 1947-03-19 | Method and apparatus for stamping, shaping or upsetting sheet metal and the like | |
GB820027A (en) * | 1956-06-08 | 1959-09-16 | Radiation Ltd | Means for shaping sheet metal articles |
US3380272A (en) * | 1965-12-27 | 1968-04-30 | Kaiser Aluminium Chem Corp | Apparatus for forming foil containers |
US3512239A (en) * | 1967-04-19 | 1970-05-19 | Rosenblad Corp | Method of forming dimpled plate heat exchanger elements by the use of hydrostatic pressure |
FR2119528A5 (en) * | 1970-12-25 | 1972-08-04 | Amada Co Ltd | |
US3914975A (en) * | 1970-12-25 | 1975-10-28 | Amada Co Ltd | Hydraulic press brake |
US4362037A (en) * | 1980-10-24 | 1982-12-07 | Emhart Industries, Inc. | Hollow article internal pressure forming apparatus and method |
DE19705244A1 (en) * | 1997-02-12 | 1998-08-13 | Huber & Bauer Gmbh | Forming device |
DE19716663C1 (en) * | 1997-04-22 | 1998-06-25 | Hde Metallwerk Gmbh | Hydrostatic forming press for sheet metal |
US5927120A (en) * | 1997-07-30 | 1999-07-27 | Dana Corporation | Apparatus for performing a hydroforming operation |
DE19839353C1 (en) * | 1998-08-28 | 1999-11-11 | Daimler Chrysler Ag | Pressure forming method for hollow profile workpiece |
DE19939504A1 (en) * | 1999-08-20 | 2001-03-08 | Konrad Schnupp | Process for operating a forming press |
DE19957888C2 (en) * | 1999-12-01 | 2002-11-14 | Benteler Werke Ag | Device for the hydraulic high pressure forming of a tubular component or a blank |
-
2001
- 2001-12-03 AU AU2002219003A patent/AU2002219003A1/en not_active Abandoned
- 2001-12-03 CA CA002440722A patent/CA2440722A1/en not_active Abandoned
- 2001-12-03 ES ES01270389T patent/ES2240334T3/en not_active Expired - Lifetime
- 2001-12-03 EP EP01270389A patent/EP1341623B1/en not_active Expired - Lifetime
- 2001-12-03 US US10/450,361 patent/US20040103707A1/en not_active Abandoned
- 2001-12-03 AT AT01270389T patent/ATE291507T1/en not_active IP Right Cessation
- 2001-12-03 WO PCT/DE2001/004492 patent/WO2002047839A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0247839A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2002219003A1 (en) | 2002-06-24 |
US20040103707A1 (en) | 2004-06-03 |
ATE291507T1 (en) | 2005-04-15 |
CA2440722A1 (en) | 2002-06-20 |
EP1341623B1 (en) | 2005-03-23 |
WO2002047839A1 (en) | 2002-06-20 |
ES2240334T3 (en) | 2005-10-16 |
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