EP3088092B1 - Outil de déformation à chaud et de trempe à la presse et procédé de fonctionnement de l'outil de déformation à chaud et de trempe à la presse - Google Patents

Outil de déformation à chaud et de trempe à la presse et procédé de fonctionnement de l'outil de déformation à chaud et de trempe à la presse Download PDF

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Publication number
EP3088092B1
EP3088092B1 EP15166066.9A EP15166066A EP3088092B1 EP 3088092 B1 EP3088092 B1 EP 3088092B1 EP 15166066 A EP15166066 A EP 15166066A EP 3088092 B1 EP3088092 B1 EP 3088092B1
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EP
European Patent Office
Prior art keywords
tool
mould
press hardening
hot forming
press
Prior art date
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Active
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EP15166066.9A
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German (de)
English (en)
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EP3088092A1 (fr
Inventor
Markus Kettler
Oliver Dobinsky
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Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Priority to EP15166066.9A priority Critical patent/EP3088092B1/fr
Priority to CN201610279916.4A priority patent/CN106077209B/zh
Priority to US15/142,883 priority patent/US9943898B2/en
Publication of EP3088092A1 publication Critical patent/EP3088092A1/fr
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Publication of EP3088092B1 publication Critical patent/EP3088092B1/fr
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    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • 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
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling

Definitions

  • the present invention relates to a hot forming and press hardening tool according to the features in the preamble of claim 1.
  • the present invention further relates to a method for operating the hot-forming and press-hardening tool according to the features in claim 9.
  • Blechumformbaumaschine For the production of components, in particular motor vehicle components, it is known to machine sheet metal blanks by means of forming processes, in particular by means of press forming in a tool. As a result Blechumformbaumaschine be prepared for the body shop, structural components or even sheet metal skin components.
  • the Blechumformbaumaschine are preferably made of steel materials, but also made of light metal materials.
  • the hot forming and press-hardening technology has become established, by means of which hardenable steel alloys are processed.
  • the degree of shaping freedom of a sheet metal blank can be increased by a previous heating, in particular to above AC3 temperature, whereby highly complex, three-dimensionally shaped components are produced. So then the component remains in the tool and is cured under at least partially martensite by rapid cooling, so that a component with at least partial high-strength, especially very high-strength material properties is produced.
  • components are produced that are lighter but also harder than components made from a conventional steel alloy that have been cold worked.
  • a forming tool is known, wherein a forming tool is formed in two parts and is moved by a second pressing force, applied by means of an active medium transversely to the press direction.
  • a disadvantage is the much more expensive construction and increased effort to operate such a hot forming and press hardening tool.
  • the document DE 10 2010 027 554 A1 discloses a hot forming and press hardening tool according to the preamble of claim 1. It is therefore an object of the present invention to provide a hot working and press hardening tool which is simple to manufacture and inexpensive and mechanically easy to operate, but which ensures that as much as possible in press hardening extensive system contact is provided especially in the area of vertically extending contact surfaces.
  • the hot-forming and press-hardening tool for producing sheet-metal forming components from a steel alloy is suitable for producing at least partially high-strength properties on the sheet-metal forming component, preferably for shaping and then hardening the entire sheet-metal component. It has for this purpose an upper tool with at least one mold segment and a lower tool with at least one mold segment, wherein the upper tool and the lower tool are movable towards each other to form a mold cavity in a Pressenhubides. Upon reaching the bottom dead center of the hot forming and press hardening tool of the mold cavity between the upper tool and lower tool or between the mold segments of upper tool and lower tool is thus formed.
  • the hot-forming and press-hardening tool is characterized in that the mold segment of the upper tool and / or the mold segment of The lower tool is divided into two parts and is movable transversely to the press stroke direction by means of a spreader device coupled to the upper tool and / or lower tool in at least one movement direction.
  • the spreading device itself acts exclusively on the mold segment, in particular by means of an expanding wedge, also referred to below as an expanding die.
  • an expanding wedge also referred to below as an expanding die.
  • the hot forming and press hardening tool according to the invention during the closing movement and / or reaching the bottom dead center of the hot forming and press hardening tool to allow a displacement of a mold segment transversely to the Pressenhubides, so that even with vertically oriented contact surfaces sufficient plant contact or Surface pressure between shaping inner lateral surface and outer lateral surface of the mold segments of the formed sheet metal blank is made.
  • a high cooling rate can thus be produced in a production-safe manner, which is why the rejects are minimized while shortening the cycle time for press hardening.
  • the tool according to the invention is suitable for the production of thermoformed and press-hardened components which have a forming angle of 90 ° to 110 °, preferably 90 ° to 100 ° and particularly preferably 90 ° to 95 °.
  • the spreading device itself is designed as a spreading die, wherein the expanding die is fixed in position either on the upper tool or on the lower tool.
  • a spreading punch can be arranged formed both on the upper tool and on the lower tool. These are then fixed in position and thus rigidly coupled in the press lifting direction and transversely to the press lifting direction with the upper tool or the lower tool.
  • the spreading punch it is advantageously possible for the spreading punch to be mounted in a relatively movable manner on the upper tool and / or on the lower tool.
  • an actuator for example by an additional hydraulic actuator, a kinematic coupling with the Pressenhubvorides or by another actuator, for example, an electromechanical actuator then the spreading can be moved again relative to the upper tool and / or the lower tool.
  • the at least two mold segments on the upper tool and / or the at least two mold segments can be mounted on the lower tool relatively displaceable in the press lifting direction. It is also possible to store the at least two mold segments in the press stroke direction in a slide-rigid manner on the upper tool or the lower tool. It is important, however, that the at least two mold segments are mounted in a direction of movement transversely to the Pressenhubraum relatively displaceable, which form on their side facing away from the forming mold cavity a Sp Dahlhohlraum and the Sp Dahlstempel moves into the Sp Schwarzhohlraum, so that move the mold segments of the Sp Schwarzstkov outward , in a direction of movement transverse to the Pressenhubraum.
  • the mold segments of the lower tool and / or the mold segments of the upper tool are mounted on the upper tool and / or the lower tool via return means.
  • the mold segments are returned to a starting position.
  • the restoring means each couple the mold segments of the upper tool with each other or the two mold segments of the lower tool with each other.
  • the restoring means can be oriented both in the press lifting direction, which is necessary in particular in the case of press sections that are relatively displaceable in the press lifting direction.
  • the return means are preferred in particular Horizontal direction acting, so that two in the horizontal direction, thus spread apart across the press stroke and spread apart mold segments are contracted by a return means, for example in the form of a return spring and here in particular a tension spring when moving out of the expansion.
  • the molding segments have tempering channels for the passage of a cooling medium, wherein the tempering channels are coupled to the upper tool and / or the lower tool via elastic and / or displaceable connections.
  • these are elastic hose connections which are, for example, compressed or stretched or bent in order to carry out the relative movement, in particular transversely to the press stroke direction.
  • a fluid-tight Cooling medium supply the temperature control channels in the respective mold segment.
  • isolation in addition to a cooled by coolant mold segment and adjacent to the insulation, a heated mold segment to produce components with locally targeted uncured areas.
  • the hot-forming and press-hardening tool is characterized in particular by the fact that the mold segments of the upper tool are formed as a two-part die, which are coupled to each other via a return means to the Pressenhubides and that the mold segment of the lower tool is formed as retracting into the die punch, wherein laterally on the punch wedge slide are arranged and the wedge slide are displaceable in the execution of the press stroke through the die transverse to the Pressenhubides outwards.
  • stop means and / or spacer means are provided on the upper tool and / or on the lower tool.
  • the relative movement is limited transversely to the Pressenhubides.
  • stop means are provided such that in a possible relative movement in Pressenhubides when reaching the bottom dead center and the die segment pushes in the press stroke on the stop means, so that at the latest at bottom dead center in Pressenhubides the complete shaping is completed.
  • the present invention further relates to a method for operating the aforementioned hot-forming and press-hardening tool, wherein the method is characterized in that during movement and / or at bottom dead center, the at least one mold segment of the upper tool or the lower tool is moved transversely to the Pressenhubides so in that a respective +/- 20 °, preferably between +/- 10 ° and particularly preferably +/- 5 ° oriented to Pressenhubides oriented portion extending in the mold cavity, thus having a substantially vertically oriented extending portion of the mold cavity has a system contact with a formed sheet metal blank which has at least 80%, preferably 90%, in particular 95% of the surface pressure with respect to a section of the formed sheet metal blank which is formed in the mold cavity, which extends substantially horizontally, thus transversely to the press stroke direction.
  • a plant contact with substantially uniform surface pressure is present on the entire component, whereby the press hardening can be carried out with high precision.
  • the hot forming and press hardening tool is suitable for components having an elongated section which is U-shaped in cross-section, so that the web of the U-shape experiences system contact with the molding segments by a surface pressure in the press stroke direction and the leg protruding from the web to form the U-shape by the direction of movement transverse to the Pressenhubides experiences sufficient contact with the mold segments.
  • a hardness or tensile strength of web and legs can thus be at an approximately the same level with particularly short cycle times for press hardening be achieved. These are less than 20 s, preferably less than 10 s, for insertion, shaping, holding and removal.
  • FIG. 1a shows a known from the prior art forming tool 1 comprising an upper tool 2 and a lower tool 3, which retract one another while forming a mold cavity 4 in Pressenhubraum 5.
  • a sheet metal plate 6 is inserted into the open mold, which is formed into the sheet metal forming component 7.
  • FIG. 1b a solution is known in which a movable additional segment 9 is provided by applying an external second pressing force 10 across the Pressenhubides 5 for a system contact.
  • the solution according to the invention looks according to this FIG. 2 a hot forming and press-hardening tool 11, in which two mold segments 13.1, 13.2 are mounted on an upper tool 12 relatively movable to the upper tool 12 and on a lower tool 14, a mold segment 15 is mounted in parallel.
  • the upper tool 12 is thus lowered onto the lower tool 14 and the mold segments 13.1, 13.2, 15 are moved toward each other in the press lifting direction 5 such that they reach the bottom dead center (right image plane of FIG FIG. 2 ) form a mold cavity 4.
  • both mold segments 13.1, 13.2 of the upper tool 12 are mounted relatively movably in the press lifting direction 5, but also additionally mounted in a direction of movement 16 transversely to the press lifting direction 5.
  • return means 20 are provided, which shown here a relative movement in Execute Pressenhub therapies 5 and not shown return means 20 which the shape segments 13.1, 13.2 contract each other, as soon as the spreading 17 is moved out of these.
  • FIG. 3 A second embodiment variant is in FIG. 3 represented, wherein also here two mold segments 13.1, 13.2 are mounted relatively movable in a direction of movement 16 transversely to the Pressenhubides 5. However, the mold segments 13.1, 13.2 are fixed in parallel to the upper tool 12 in the press lifting direction 5.
  • the spreader 17 can perform a relative movement to the upper tool 12 and in particular in Pressenhubides 5, so that at any time during the closing movement or when reaching the bottom dead center of the spreading 17 relative to the upper tool 12 by an actuator 21, for example a hydraulic ram , is movable.
  • the spreader 17 then calls again at its oblique contact surfaces 22 with the Sp Schwarzhohlraum 18 of the mold segments 13.1, 13.2 the movement of the mold segments 13.1, 13.2 in the direction of movement 16 transversely to the Pressenhubides 5, so that even in the vertically oriented sections between mold segment and formed sheet metal plate. 6 a sufficient contact with the system and / or a sufficient surface pressure is achieved.
  • FIG. 4 shows an alternative embodiment variant of the present invention.
  • a two-part die 23.1, 23.2 is formed on the upper tool 12, which moves in a slide-rigid with the lower tool 14 connected punch 24.
  • edge-mounted wedge slide 25 are arranged, which are moved when retracting the die 23.1, 23.2 in the direction of movement 16 transversely to the Pressenhubides 5 to the outside.
  • the wedge sliders 25 are bounded on the outside by stop elements 19 and controllable with them via a force means 26, in particular in the form of a compression spring and / or a hydraulic system such that, on the one hand, a restoring force is provided, and, on the other hand, if the stop element 19 is not in a form-locking manner Surface pressure is achieved at the outer contact surfaces.
  • the die parts 23.1, 23.2 can also be moved relative to each other in the direction of movement 16. They are pressed together by a spreading spring 27.
  • FIGS. 2 to 4 are each indicated in the die 24, die 23.1, 23.2 or mold segment 13.1, 13.2, 15 tempering 28 for the passage of a tempering, in particular a cooling medium. These can be evenly distributed, but also be arranged only partially, so that a targeted temperature control of the formed component can be performed.
  • FIG. 5 shows a cross section through a motor vehicle pillar according to the invention manufactured comprising a web 29 and extending from the web 29 leg 30 and a again projecting from the legs 30 flange 31.
  • an angle ⁇ of preferably 90 ° to 100 °, in particular 90 ° to 95 ° and particularly preferably formed by about 90 °.
  • the legs 30 are made by preferably a plant contact with a direction of movement 16 transversely to the Pressenhubraum 5.
  • the tensile strength of the legs 30 has at least 90% of the tensile strength of the web 29 due to the press-hardening with the hot-forming and press-hardening tool 11 according to the invention. Preferably more than 95% of the tensile strength. In particular, the tensile strength of the legs 30 is greater than or equal to 98% of the tensile strength of the web 29th
  • FIG. 6 shows a second embodiment variant of a sheet metal forming component 7 produced according to the invention, which is produced with the hot forming and press-hardening tool 11 according to the invention.
  • This has a W-shaped cross section, which is why the web 29 is formed in two parts and thus four legs 30 are formed.
  • the sheet metal forming component 7 is according to FIG. 6 on a forming tool 1 according to FIG. 4 produced, in turn, the above-mentioned ratios of the set with the press hardening tensile strength of web 29 to leg 30 are formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (9)

  1. Outil (11) de formage à chaud et de trempe à la presse pour fabriquer des pièces formées en tôle (7) avec des propriétés au moins partiellement de résistance élevée, comportant un outil supérieur (12) avec au moins un segment de formage (13.1, 13.2) et un outil inférieur (14) avec au moins un segment de formage (15), dans lequel l'outil supérieur (2) et l'outil inférieur (3) peuvent être déplacés l'un vers l'autre dans une direction de course de presse (5) en formant une cavité de formage (4), dans lequel des canaux de réglage de température (28) destinés à la circulation d'un fluide de refroidissement sont prévus dans au moins un segment de formage (13.1, 13.2, 15) et dans lequel le segment de formage (13.1, 13.2) de l'outil supérieur (12) et/ou le segment de formage (15) de l'outil inférieur (14) sont au moins divisés en deux, caractérisé en ce que le segment de formage (13.1, 13.2) peut être déplacé dans au moins une direction de déplacement (16) transversale à la direction de course de presse (5) avec un dispositif d'écartement couplé à l'outil supérieur (12) et/ou à l'outil inférieur (14).
  2. Outil de formage à chaud et de trempe à la presse selon la revendication 1, caractérisé en ce que le dispositif d'écartement est un poinçon d'écartement (17), lequel poinçon d'écartement (17) est logé fixe en position au niveau de l'outil supérieur (12) et/ou de l'outil inférieur (14) ou lequel poinçon d'écartement (17) est logé relativement mobile au niveau de l'outil supérieur (12) et/ou de l'outil inférieur (14).
  3. Outil de formage à chaud et de trempe à la presse selon la revendication 2, caractérisé en ce que les au moins deux segments de formage (13.1, 13.2) au niveau de l'outil supérieur (12) et/ou les au moins deux segments de formage au niveau de l'outil inférieur (14) sont logés de manière à pouvoir être translatés l'un par rapport à l'autre dans au moins une direction de déplacement (16) transversale à la direction de course de presse (5) et forment une cavité d'écartement (18), les segments de formage (13.1, 13.2, 15) étant déplacés vers l'extérieur par le poinçon d'écartement (17) lors de l'introduction du poinçon d'écartement (17) dans la cavité d'écartement (18).
  4. Outil de formage à chaud et de trempe à la presse selon l'une des revendications 1 à 3, caractérisé en ce que les segments de formage (13.1, 13.2) sont logés au niveau de l'outil supérieur (12) et/ou de l'outil inférieur (14) par l'intermédiaire de moyens de rappel (20) et/ou en ce que les segments de formage (13.1, 13.2, 15) sont couplés entre eux par l'intermédiaire d'un moyen de rappel (20) de telle sorte que, lors de l'ouverture de l'outil (11) de formage à chaud et de trempe à la presse, il se produit un retour des segments de formage (13.1, 13.2, 15) dans une position de départ.
  5. Outil de formage à chaud et de trempe à la presse selon l'une des revendications 2 à 4, caractérisé en ce que le poinçon d'écartement (17) peut être déplacé par rapport à l'outil supérieur (12) et/ou à l'outil inférieur (14) par l'intermédiaire d'un actionneur (21).
  6. Outil de formage à chaud et de trempe à la presse selon l'une des revendications 1 à 5, caractérisé en ce que des canaux de réglage de température (28) destinés à la circulation du fluide de refroidissement sont couplés à l'outil supérieur (12) et/ou à l'outil inférieur (14) par l'intermédiaire de raccords élastiques et/ou coulissables et/ou en ce qu'un segment de chauffage est prévu dans un segment de formage (13.1, 13.2, 15).
  7. Outil de formage à chaud et de trempe à la presse selon l'une des revendications 1 à 6, caractérisé en ce que les segments de formage (13.1, 13.2) de l'outil supérieur (12) sont conçus comme des matrices (23.1, 23.2) divisées en deux, lesquelles sont couplées transversalement par rapport à la direction de course de presse (5) par l'intermédiaire d'un moyen de rappel (20) et/ou d'un ressort d'écartement (27) et en ce que le segment de formage (15) de l'outil inférieur (14) est conçu comme un poinçon (24) entrant dans la matrice (23.1, 23.2), des cales coulissantes (25) étant agencées latéralement au niveau du poinçon (24) et les cales coulissantes (25) pouvant être déplacées vers l'extérieur transversalement par rapport à la direction de course de presse (5) lors de l'exécution de la course de presse par la matrice (23.1, 23.2).
  8. Outil de formage à chaud et de trempe à la presse selon l'une des revendications 1 à 7, caractérisé en ce que des moyens formant butée et/ou des moyens d'espacement sont prévus et/ou en ce que les segments de formage (13.1, 13.2, 15) sont logés mobiles, dans la direction de course de presse (5), par rapport à l'outil supérieur (12) et/ou à l'outil inférieur (14).
  9. Procédé pour faire fonctionner un outil de formage à chaud et de trempe à la presse selon au moins la revendication 1, caractérisé en ce que, pendant le mouvement de fermeture et/ou au point mort bas de l'outil de formage à chaud, on déplace l'au moins un segment de formage (13.1, 13.2, 15) transversalement par rapport à la direction de course de presse (5) de telle sorte que, dans la cavité de formage (4), une partie, qui s'étend avec une orientation de plus ou moins 20°, de préférence plus ou moins 10°, par rapport à la direction de course de presse (5), de la cavité de formage (4) présente un contact d'appui avec une plaque de tôle déformée (6), lequel contact d'appui correspond à au moins 80 %, de préférence 90 %, et notamment 95 %, de la pression surfacique des parties, orientées globalement horizontalement, de la cavité de formage (4).
EP15166066.9A 2015-04-30 2015-04-30 Outil de déformation à chaud et de trempe à la presse et procédé de fonctionnement de l'outil de déformation à chaud et de trempe à la presse Active EP3088092B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15166066.9A EP3088092B1 (fr) 2015-04-30 2015-04-30 Outil de déformation à chaud et de trempe à la presse et procédé de fonctionnement de l'outil de déformation à chaud et de trempe à la presse
CN201610279916.4A CN106077209B (zh) 2015-04-30 2016-04-29 热成型压淬模具及热成型压淬模具的操作方法
US15/142,883 US9943898B2 (en) 2015-04-30 2016-04-29 Hot-forming and press hardening tool and method for operating the hot-forming and press hardening tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15166066.9A EP3088092B1 (fr) 2015-04-30 2015-04-30 Outil de déformation à chaud et de trempe à la presse et procédé de fonctionnement de l'outil de déformation à chaud et de trempe à la presse

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Publication Number Publication Date
EP3088092A1 EP3088092A1 (fr) 2016-11-02
EP3088092B1 true EP3088092B1 (fr) 2017-06-07

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US (1) US9943898B2 (fr)
EP (1) EP3088092B1 (fr)
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US20160318087A1 (en) 2016-11-03
US9943898B2 (en) 2018-04-17
EP3088092A1 (fr) 2016-11-02
CN106077209B (zh) 2018-09-04

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