EP3166737A1 - Method for producing a press-quenched part - Google Patents

Method for producing a press-quenched part

Info

Publication number
EP3166737A1
EP3166737A1 EP15735879.7A EP15735879A EP3166737A1 EP 3166737 A1 EP3166737 A1 EP 3166737A1 EP 15735879 A EP15735879 A EP 15735879A EP 3166737 A1 EP3166737 A1 EP 3166737A1
Authority
EP
European Patent Office
Prior art keywords
press
punch
tempered
collar
component
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
Application number
EP15735879.7A
Other languages
German (de)
French (fr)
Other versions
EP3166737B1 (en
Inventor
Volker Smukala
Ralf Sünkel
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.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
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 ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3166737A1 publication Critical patent/EP3166737A1/en
Application granted granted Critical
Publication of EP3166737B1 publication Critical patent/EP3166737B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims

Definitions

  • the present invention relates to a method for producing a press-hardened component with a collar.
  • Hot-formed or press-hardened components are due to their high
  • Strength characteristics are used as safety-relevant components, inter alia, in vehicle construction. Passages or collars of components in which further component elements, in particular chassis parts are added, can
  • Disclosure of the invention It is an object of the present invention to provide a method for producing a press-hardened member having a collar-protruding passage, whereby the collar-protruding passage obtains a higher resistance to a continuous load by vibration and / or stress peaks.
  • the object of the present invention is achieved by a method for producing a press-hardened component which comprises a passage with a collar formed on the periphery of the pull-through, characterized in that before or during the press-hardening of the component a tempered punch is inserted into the passage, wherein the tempered stamp is tempered such that the temperature is maintained in the region of the collar above the martensite start temperature of the steel material used.
  • the method according to the invention for producing a press-hardened component has the advantage that first of all, a transformation of the microstructure into martensite in the area of the passage or of the collar during the
  • Vibrational energy or stress energy can be partially transformed into an elastic
  • the temperature of the punch is regulated so that a
  • the process of collar formation is positively influenced to the extent that the collar crack sensitivity decreases.
  • a collar pull is possible by passing the punch through the component to be pressed, without the collar breaking in the material drawing process.
  • the press-hardening component can be produced both in the single-stage process and in the two-stage or multi-stage process, which is preceded by at least one shaping, in particular of the draft in the cold state.
  • the temperature of the stamp for example, at least 400 ° C, in particular at least 450 ° C and does not exceed the Ac1 temperature or is preferably not higher than 700 ° C.
  • Material increases due to the transformation into martensite in the material structure.
  • the component to be cured In the part in which the component to be cured is not exposed to the permanent loads of vibrations of adjacent components, the component can be cured maximum. It is also preferable that a region circulating the draft is also not completely cured, whereby a steady and, for example, non-discontinuous transition between the fully cured region and the region of lower strength can be set.
  • the circumferential area is in particular at most 2 times, preferably at most 1, 5 times the diameter of the passage.
  • an upper tool of the press-hardening tool is designed to receive the tempered punch extendable and positively in a first recess.
  • the positive embedding of the extendable from the first recess punch in the direction of the material to be hardened high stability in the motion control of the punch is ensured so that the collar can take place under stable and calibratable conditions.
  • a conversion into Marten is only in the range of the pull or the collar, but not in the remaining part of the component, prevented.
  • the local reduction of the material hardness can thus be very targeted.
  • the extendable punch stamp and upper tool can be formed as a unit, whereby the structure can be made simpler and at least the drive devices for the stamp can be saved.
  • a lower tool of the press-hardening tool is designed to positively receive the tempered punch in an extended position and the collar in a second recess, wherein the second recess of the first recess opposite and has a larger radius or diameter than the first recess.
  • the geometry of the tempered stamp, the geometry of the passage and a stroke of the extension of the tempered punch a height of the collar is determined.
  • the present invention further comprises an apparatus for producing a
  • Press - hardened component which has a passage with a at the periphery of the
  • Device further comprises a tempered punch, which is adapted to be retracted before or during the press-curing of the component in the passage and thereby tempered so that the temperature in the region of the collar above the martensite start temperature of the steel used material held it becomes.
  • a tempered punch which is adapted to be retracted before or during the press-curing of the component in the passage and thereby tempered so that the temperature in the region of the collar above the martensite start temperature of the steel used material held it becomes.
  • FIG. 1 shows a schematic of a device for press-hardening a component
  • FIG. 1 schematically shows a device 100 for hot forming, in particular for press hardening, of a component 106.
  • the device consists of a
  • the component 106 to be molded can be inserted into the device 100 as a flat, pre-cut sheet metal blank in the warm state (single-stage hot forming) or as an already cold, preformed semi-finished product (two-stage hot forming) in the warm state.
  • Embedded in the upper tool 102 is a punch 108 in a first recess 16.
  • the punch 106 has means 110 for tempering the punch 106.
  • Lower tool 104 has a second recess 1 18 for receiving the punch 108 and a pulled collar 1 12 of the component 106. For this it is necessary that the second recess 1 18 has a larger radius or diameter than the first recess 16 1.
  • Hot forming in the still cold mold board of the component 106 or by hot step immediately before the collar pulling in hot forming tool 100 are introduced.
  • the geometry of the passage 1 14 and the collar 1 12 of the component 106 are drawn and / or calibrated in a forming step in the hot press-hardening component 106 by means of the extended tempered punch 108.
  • the upper tool and the punch are formed as one unit.
  • the pressing tool 100 is cooled conventionally, for example by active cooling or by
  • the method according to the invention for producing break-resistant collars of a press-hardened component is characterized in that the stamp 108 introduced into the component before or during the hot-forming process is tempered during the entire forming process so that molding does not take place in the region of the collar, so that here locally forms a soft mixed structure with increased elongation at break and ductility, while the rest of the area of the component 106 by high
  • the collar-pulling punch 108 remains during the entire curing process in the passage 1 14 and is actively tempered by the means 1 10 for temperature control. By constantly adjusting the temperature of the punch 108, the temperature in the component 106 in the local region of the collar 1 12 always remains above the martensite start temperature, so that locally a range of high ductility and elongation at break and a collar pull without edge ripper is made possible.
  • a region 124 passing through the passageway 14 is not fully cured to provide a smooth transition between the fully cured region and the lesser region To create strength.
  • the circumferential region 124 is in particular at most twice, preferably at most 1.5 times the diameter D of the passage.
  • This area 124 can be adjusted by the means 120, 122 integrated in the upper and lower tool 102, 104.
  • the means 120, 122 may be tempered or formed from a poorly heat-conductive material, for example from a ceramic.
  • at least the means 120 comprises insulation for thermal separation between the tempered die 108 and the preferably actively cooled upper tool 102.
  • Material wear and tear, caused by fatigue loading by other coupled components, or voltage peaks, caused by the assembly of different components, can be effectively counteracted by the locally differentiated material hardness.
  • the service life of connected components can be extended significantly and the safety of, for example, a multi-component vehicle frame can be significantly increased.

Abstract

The invention relates to a method for producing a press-quenched part that has a rim hole with a rim at the periphery of the rim hole. In said method, a temperature-controlled die is introduced into the rim hole prior to or during the press-quenching process; the temperature-controlled die is temperature-controlled in such a way that the temperature in the region of the rim is maintained above the martensite point of the steel material used.

Description

BESCHREIBUNG  DESCRIPTION
Titel title
Verfahren zur Herstellung eines pressgehärteten Bauteils  Method for producing a press-hardened component
Stand der Technik State of the art
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines pressgehärteten Bauteils mit einem Kragen. The present invention relates to a method for producing a press-hardened component with a collar.
Warmumgeformte bzw. pressgehärtete Bauteile werden aufgrund ihrer hohen Hot-formed or press-hardened components are due to their high
Festigkeitskennwerte als sicherheitsrelevante Bauteile unter anderem im Fahrzeugbau eingesetzt. Durchzüge bzw. Krägen von Bauteilen, in die weitere Bauteilelemente, insbesondere Fahrwerksteile aufgenommen werden, können Strength characteristics are used as safety-relevant components, inter alia, in vehicle construction. Passages or collars of components in which further component elements, in particular chassis parts are added, can
Dauerschwingungsbeanspruchungen ausgesetzt sein. Bei Durchzügen mit hohem Härtegrad ist die Wahrscheinlichkeit erhöht, dass es durch derartige permanente Be exposed to continuous vibration stresses. For high durometer pullout, the likelihood of it being permanently increased is increased
Dauerbeanspruchungen zu einem vorzeitigen Materialverschleiß der Bauteile im Bereich der Durchzüge bzw. Krägen kommt, da die Duktilität bei hohen Materialhärtegraden sehr niedrig ist und Spannungsspitzen nicht durch elastische Verformungen absorbiert werden können. Bei Bauteilen, welche im Bereich der Durchzüge bzw. Krägen einen ebenso hohen Continuous stresses on premature wear of the components in the area of the passages or collars comes because the ductility is very low at high material hardness levels and stress peaks can not be absorbed by elastic deformations. For components, which in the area of the passages or collars an equally high
Materialhärtegrad aufweisen wie in anderen Bereichen des Bauteils, besteht somit eine erhöhte Bruchgefahr. Da im Stand der Technik beispielsweise derartige Durchzüge mit einem Kragen als Verbundschnittstellen zwischen verschiedenen Fahrzeugteilen dienen, ist die Fahrzeugsicherheit durch das bestehende Risiko, dass sich Fahrzeugteile voneinander lösen können bzw. plötzlich versagen, sehr hoch. Material hardness grade as in other areas of the component, there is thus an increased risk of breakage. Since in the prior art, for example, such passages with a collar serve as composite interfaces between different vehicle parts, vehicle safety is very high due to the existing risk of vehicle parts being able to separate from one another or suddenly failing.
Aus dem Stand der Technik sind Presshärte-Methoden zur Erzeugung von gehärteten Blechprofilen mit einem Durchzug mit vorstehendem Kragen durch Einfahren eines gekühlten Stempels in einem Bereich des Bauteils bekannt, wobei eine homogen hohe Materialhärte im ganzen Bauteil angestrebt wird (DE 101 49 220 C1 ). From the prior art press hardening methods for producing hardened sheet-metal profiles with a pull-through collar are known by retracting a cooled stamp in a region of the component, with a homogeneous high material hardness throughout the component is sought (DE 101 49 220 C1).
Offenbarung der Erfindung Es ist eine Aufgabe der vorliegenden Erfindung ein Verfahren zur Herstellung eines pressgehärteten Bauteils mit einem Durchzug mit vorstehendem Kragen zur Verfügung zu stellen, wodurch der Durchzug mit vorstehendem Kragen eine höhere Resistenz gegen eine Dauerbelastung durch Schwingungen und/oder Spannungsspitzen erhält. Disclosure of the invention It is an object of the present invention to provide a method for producing a press-hardened member having a collar-protruding passage, whereby the collar-protruding passage obtains a higher resistance to a continuous load by vibration and / or stress peaks.
Die Aufgabe der vorliegenden Erfindung wird gelöst durch ein Verfahren zur Herstellung eines pressgehärteten Bauteils, welches einen Durchzug mit einem an der Peripherie des Durchzugs ausgebildeten Kragen umfasst, dadurch charakterisiert, dass vor oder während der Presshärtung des Bauteils ein temperierter Stempel in den Durchzug eingefahren wird, wobei der temperierte Stempel derart temperiert wird, dass die Temperatur im Bereich des Kragens oberhalb der Martensit-Starttemperatur des eingesetzten Stahlwerkstoffes gehalten wird. The object of the present invention is achieved by a method for producing a press-hardened component which comprises a passage with a collar formed on the periphery of the pull-through, characterized in that before or during the press-hardening of the component a tempered punch is inserted into the passage, wherein the tempered stamp is tempered such that the temperature is maintained in the region of the collar above the martensite start temperature of the steel material used.
Gegenüber dem Stand der Technik hat das erfindungsgemäße Verfahren zur Herstellung eines pressgehärteten Bauteils dabei den Vorteil, dass zunächst eine Umwandlung des Gefüges in Martensit im Bereich des Durchzugs bzw. des Kragens während des Compared with the prior art, the method according to the invention for producing a press-hardened component has the advantage that first of all, a transformation of the microstructure into martensite in the area of the passage or of the collar during the
Presshärtens verhindert wird. Während mit zunehmender Flächenpressung durch das Presswerkzeug die Härte im übrigen Werkstoff aufgrund einer einsetzenden Press hardening is prevented. While with increasing surface pressure by the pressing tool, the hardness in the rest of the material due to an incipient
Phasenumwandlung in Martensit steigt, wird im Bereich des Durchzugs bzw. des Kragens eine Martensitbildung verhindert. Im Bereich des Durchzugs bzw. des Kragens kommt es stattdessen zur Bildung eines weichen Mischgefüges. Durch das Tempern des in den Durchzug einfahrenden Stempels wird ein schroffes Abkühlen weitgehend verhindert, sodass sich eine bei geringerer Materialfestigkeit höhere Duktilität gegenüber dem übrigen Bereich einstellt. Im Bereich des Durchzugs bzw. des Kragens bekommt das Material ein höheres Bruchdehnungspotential. An dem Durchzug bzw. Kragen aufgenommene Phase transformation in martensite increases martensite formation is prevented in the region of the passage or the collar. In the area of the draft or the collar, instead, a soft mixed structure is formed. Due to the tempering of the retracting punch in the stamping a rugged cooling is largely prevented, so that sets a lower material strength higher ductility over the rest of the range. In the area of the passage or the collar, the material gets a higher potential for breaking expansion. Recorded on the passage or collar
Schwingungsenergie oder Spannungsenergie kann teilweise in eine elastische Vibrational energy or stress energy can be partially transformed into an elastic
Verformungsenergie umgewandelt werden, sodass die Bruchgefahr an den Deformation be converted so that the risk of breakage to the
Verbundschnittstellen mehrerer Komponenten abnimmt. Das bei Composite interfaces of multiple components decreases. The at
Dauerschwingungsbelastungen unter Druck und Kontakt gezeigte Verhalten der Bauteile im Bereich der Durchzüge bzw. Kragen verbessert sich. Gleichzeitig wird die Wahrscheinlichkeit des Auftretens eines Kantenrisses beim Kragenziehen reduziert. Zudem verbessern sich die Schweißeigenschaften der möglicherweise als Verbundschnittstellen dienenden Krägen.  Continuous vibration loads under pressure and contact shown behavior of the components in the area of the passages or collar improves. At the same time, the probability of the occurrence of an edge tear when collaring is reduced. In addition, the welding properties of collars possibly serving as composite interfaces improve.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind den Unteransprüchen, sowie der Beschreibung unter Bezugnahme auf die Zeichnungen entnehmbar. In einer weiteren Ausführungsform ist es vorgesehen, dass der während der Presshärtung des Bauteils eingefahrene temperierte Stempel während des vollständigen Prozesses der Presshärtung in dem Durchzug verbleibt. Advantageous embodiments and modifications of the invention are the dependent claims, as well as the description with reference to the drawings. In a further embodiment, it is provided that the tempered stamp retracted during the press-hardening of the component remains in the passage during the complete process of press-hardening.
Dadurch wird in vorteilhafter Weise erreicht, dass während des ganzen This achieves in an advantageous manner that during the whole
Herstellungsprozesses die Temperatur des Stempels so reguliert wird, dass eine Manufacturing process, the temperature of the punch is regulated so that a
Starttemperatur für die Umwandlung in Martensit im Bereich des Durchzugs bzw. des Kragens nicht unterschritten wird, auch wenn im übrigen Bereich die Temperatur weiter abnimmt. Auch wird durch ein Konstanthalten der Temperatur oberhalb einer bestimmten Temperatur der Prozess der Kragenbildung dahingehend positiv beeinflusst, dass die Kragenrissempfindlichkeit abnimmt. In vorteilhafter Weise ist eine Kragenziehung durch Durchstellen des Stempels durch das zu pressende Bauteil möglich, ohne dass der Kragen beim Materialziehungsprozess reißt. Das presszuhärtende Bauteil lässt sich sowohl im einstufigen Prozess als auch im zweistufigen bzw. mehrstufigen Prozess, dem mindestens eine Formung insbesondere des Durchzuges im kalten Zustand vorausgeht, herstellen. Je nach Stahlzusammensetzung kann die Temperatur des Stempels beispielsweise mindestens 400°C, insbesondere mindestens 450°C betragen und überschreitet nicht die Ac1- Temperatur bzw. ist vorzugsweise nicht höher als 700°C. Start temperature for the transformation into martensite in the range of the draft or the collar is not exceeded, even if the temperature decreases in the remaining area. Also, by keeping the temperature above a certain temperature constant, the process of collar formation is positively influenced to the extent that the collar crack sensitivity decreases. Advantageously, a collar pull is possible by passing the punch through the component to be pressed, without the collar breaking in the material drawing process. The press-hardening component can be produced both in the single-stage process and in the two-stage or multi-stage process, which is preceded by at least one shaping, in particular of the draft in the cold state. Depending on the steel composition, the temperature of the stamp, for example, at least 400 ° C, in particular at least 450 ° C and does not exceed the Ac1 temperature or is preferably not higher than 700 ° C.
In einer weiteren Ausführungsform wird der übrige Teil des Bauteils während der In a further embodiment, the remaining part of the component during the
Presshärtung aktiv abgekühlt. Press hardening actively cooled.
Die höheren Abkühlraten mit insbesondere zunehmender Flächenpressung im übrigen Teil des zu härtenden Bauteils bewirken in vorteilhafter Weise, dass die Material härte im The higher cooling rates, in particular increasing surface pressure in the remaining part of the component to be cured effect in an advantageous manner that the material hardness in
Werkstoff aufgrund der Umwandlung in Martensit im Materialgefüge ansteigt. In dem Teil, in dem das zu härtende Bauteil nicht den Dauerbelastungen von Schwingungen angrenzender Komponenten ausgesetzt ist, kann das Bauteil maximal gehärtet werden. Vorzugsweise wird ein den Durchzug umlaufender Bereich ebenfalls nicht vollständig gehärtet, wodurch ein stetiger und beispielsweise nicht sprunghafter Übergang zwischen dem vollständig gehärteten Bereich und dem Bereich geringerer Festigkeit eingestellt werden kann. Der umlaufende Bereich beträgt insbesondere maximal das 2-fache, vorzugsweise maximal das 1 ,5-fache des Durchmessers des Durchzuges. Gemäß einer weiteren Ausführungsform ist es vorgesehen, dass ein Oberwerkzeug des Presshärtewerkzeugs dazu ausgebildet ist, den temperierten Stempel ausfahrbar und formschlüssig in einer ersten Aussparung aufzunehmen. Durch die formschlüssige Einbettung des aus der ersten Aussparung ausfahrbaren Stempels in Richtung des zu härtenden Werkstoffs ist eine hohe Stabilität in der Bewegungsführung des Stempels gewährleistet, so dass die Kragenziehung unter stabilen und kalibrierbaren Bedingungen stattfinden kann. Bei ausgefahrener Position des temperierten Stempels wird zudem erreicht, dass eine Umwandlung in Marten nur im Bereich des Durchzugs bzw. des Kragens, nicht aber im übrigen Teil des Bauteils, verhindert wird. Die lokale Reduzierung der Materialhärte kann somit sehr gezielt erfolgen. Alternativ zum ausfahrbaren Stempel können Stempel und Oberwerkzeug als eine Einheit ausgebildet sein, wodurch der Aufbau einfacher gestaltet werden kann und zumindest die Antriebsvorrichtungen für den Stempel eingespart werden kann. Material increases due to the transformation into martensite in the material structure. In the part in which the component to be cured is not exposed to the permanent loads of vibrations of adjacent components, the component can be cured maximum. It is also preferable that a region circulating the draft is also not completely cured, whereby a steady and, for example, non-discontinuous transition between the fully cured region and the region of lower strength can be set. The circumferential area is in particular at most 2 times, preferably at most 1, 5 times the diameter of the passage. According to a further embodiment, it is provided that an upper tool of the press-hardening tool is designed to receive the tempered punch extendable and positively in a first recess. The positive embedding of the extendable from the first recess punch in the direction of the material to be hardened high stability in the motion control of the punch is ensured so that the collar can take place under stable and calibratable conditions. In the extended position of the tempered stamp is also achieved that a conversion into Marten is only in the range of the pull or the collar, but not in the remaining part of the component, prevented. The local reduction of the material hardness can thus be very targeted. As an alternative to the extendable punch stamp and upper tool can be formed as a unit, whereby the structure can be made simpler and at least the drive devices for the stamp can be saved.
In einer weiteren Ausführungsform ist ein Unterwerkzeug des Presshärtewerkzeugs dazu ausgebildet, den temperierten Stempel in einer ausgefahrenen Position und den Kragen in einer zweiten Aussparung formschlüssig aufzunehmen, wobei die zweite Aussparung der ersten Aussparung gegenüber liegt und einen größeren Radius oder Durchmesser aufweist als die erste Aussparung. In a further embodiment, a lower tool of the press-hardening tool is designed to positively receive the tempered punch in an extended position and the collar in a second recess, wherein the second recess of the first recess opposite and has a larger radius or diameter than the first recess.
Dadurch wird in vorteilhafter Weise die Zielgerichtetheit der Bewegungsführung des temperierten Stempels wesentlich gesteigert und die Kragenziehung in Richtung As a result, the Zielgerichtetheit the motion control of the tempered punch is increased significantly and the collar pull in the direction in an advantageous manner
Unterwerkzeug überhaupt erst ermöglicht, denn dem aus der Planarebene des zu härtenden Werkstoffs abgelenkten Material wird beim Pressen ein Raum zum Ausweichen zur Lower tool ever made possible, because the deflected from the planar plane of the material to be hardened material during pressing a space to dodge
Verfügung gestellt. Provided.
In einer weiteren Ausführungsform ist es vorgesehen, dass die Geometrie des temperierten Stempels die Geometrie des Durchzugs und durch eine Hubweite des Ausfahrens des temperierten Stempels eine Höhe des Kragens bestimmt wird. In a further embodiment, it is provided that the geometry of the tempered stamp, the geometry of the passage and a stroke of the extension of the tempered punch a height of the collar is determined.
Durch Wahl der Abmessungen des temperierten Stempels und Durchstellung des temperierten Stempels durch den Durchzug mit einer bestimmten Hubweite lässt sich in vorteilhafter Weise die Ausprägungsform eines Kragens eines zu härtenden Bauteils bestimmen. Eine Anpassung an vorgegebene räumliche oder statisch-dynamische By choosing the dimensions of the tempered punch and passing the tempered punch through the passage with a certain stroke can be in an advantageous manner, the manifestation of a collar of a component to be cured determine. An adaptation to given spatial or static-dynamic
Bedingungen ist problemlos möglich. Conditions are easily possible.
Die vorliegende Erfindung umfasst weiter eine Vorrichtung zur Herstellung eines The present invention further comprises an apparatus for producing a
pressgehärteten Bauteils, welches einen Durchzug mit einem an der Peripherie des Press - hardened component, which has a passage with a at the periphery of the
Durchzugs ausgebildeten Kragen umfasst, wobei zur Herstellung des pressgehärteten Bauteils ein Presshärtewerkzeug verwendet wird, dadurch charakterisiert, dass die By pulling trained collar includes, wherein for the production of the press-hardened component, a press-hardening tool is used, characterized in that the
Vorrichtung ferner einen temperierten Stempel aufweist, welcher dazu ausgebildet ist, vor oder während der Presshärtung des Bauteils in den Durchzug eingefahren zu werden und dabei derart temperiert zu werden, dass die Temperatur im Bereich des Kragens oberhalb der Martensit-Starttemperatur des eingesetzten Stahl Werkstoff es gehalten wird. Device further comprises a tempered punch, which is adapted to be retracted before or during the press-curing of the component in the passage and thereby tempered so that the temperature in the region of the collar above the martensite start temperature of the steel used material held it becomes.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der Zeichnung, sowie aus der nachfolgenden Beschreibung von bevorzugten Ausführungsformen anhand der Zeichnung. Die Zeichnung illustriert dabei lediglich beispielhafte Ausführungsformen der Erfindung, welche den wesentlichen Erfindungsgedanken nicht einschränken. Further details, features and advantages of the invention will become apparent from the drawing, as well as from the following description of preferred embodiments with reference to the drawing. The drawing illustrates only exemplary embodiments of the invention, which do not limit the essential inventive idea.
Kurze Beschreibung der Figur Brief description of the figure
Figur 1 zeigt ein Schema einer Vorrichtung zum Presshärten eines Bauteils FIG. 1 shows a schematic of a device for press-hardening a component
Ausführungsformen der Erfindung Embodiments of the invention
In Figur 1 ist eine Vorrichtung 100 zum Warmumformen, insbesondere zum Presshärten, eines Bauteils 106 schematisch dargestellt. Die Vorrichtung besteht aus einem FIG. 1 schematically shows a device 100 for hot forming, in particular for press hardening, of a component 106. The device consists of a
Oberwerkzeug 102 und einem Unterwerkzeug 104, zwischen welche das zu formende Bauteil 106 beim Prozess des Warmumformens, insbesondere beim Presshärten, angeordnet wird. Das zu formende Bauteil 106 kann als ebener, vorgelochter Blechzuschnitt im warmen Zustand (einstufige Warmumformung) oder als bereits kalt, vorgeformtes Halbzeug (zweistufige Warmumformung) im warmen Zustand in die Vorrichtung 100 eingelegt werden. In das Oberwerkzeug 102 eingebettet ist ein Stempel 108 in einer ersten Aussparung 1 16. Der Stempel 106 weist Mittel 1 10 zur Temperierung des Stempels 106 auf. Das Upper tool 102 and a lower tool 104, between which the component 106 to be formed in the process of hot forming, in particular during press hardening, is arranged. The component 106 to be molded can be inserted into the device 100 as a flat, pre-cut sheet metal blank in the warm state (single-stage hot forming) or as an already cold, preformed semi-finished product (two-stage hot forming) in the warm state. Embedded in the upper tool 102 is a punch 108 in a first recess 16. The punch 106 has means 110 for tempering the punch 106. The
Unterwerkzeug 104 weist eine zweite Aussparung 1 18 zur Aufnahme des Stempels 108 sowie eines gezogenen Kragens 1 12 des Bauteils 106 auf. Dafür erforderlich ist, dass die zweite Aussparung 1 18 einen größeren Radius bzw. Durchmesser aufweist als die erste Aussparung 1 16. Lower tool 104 has a second recess 1 18 for receiving the punch 108 and a pulled collar 1 12 of the component 106. For this it is necessary that the second recess 1 18 has a larger radius or diameter than the first recess 16 1.
Weitere Vorrausetzungen für das Kragenziehen ist eine erste Aussparung 1 16 im Bauteil 106, durch welche der temperierte Stempel 108 vor oder während des Further prerequisites for the collar pulling is a first recess 1 16 in the component 106, through which the tempered punch 108 before or during the
Warmumformungsprozesses getrieben wird. Der Durchzug 1 14 kann vor der Hot forming process is driven. The passage 1 14 can before the
Warmumformung in die noch kalte Formplatine des Bauteils 106 oder mittels Warmschritt unmittelbar vor dem Kragenziehen im Warmumformwerkzeug 100 eingebracht werden.  Hot forming in the still cold mold board of the component 106 or by hot step immediately before the collar pulling in hot forming tool 100 are introduced.
Die Geometrie des Durchzugs 1 14 und des Kragens 1 12 des Bauteils 106 werden in einem Umformschritt in das warme presszuhärtende Bauteil 106 mittels des ausfahrenden temperierten Stempels 108 gezogen und/oder kalibriert. Alternativ sind das Oberwerkzeug und der Stempel als eine Einheit ausgebildet. In dem Teil des Bauteils 106, in dem die maximale Materialhärte durch Umwandlung in Martensit erreicht werden soll, wird das Presswerkzeug 100 klassisch gekühlt, etwa durch aktive Kühlung oder durch The geometry of the passage 1 14 and the collar 1 12 of the component 106 are drawn and / or calibrated in a forming step in the hot press-hardening component 106 by means of the extended tempered punch 108. Alternatively, the upper tool and the punch are formed as one unit. In the part of the component 106 in which the maximum material hardness is to be achieved by conversion into martensite, the pressing tool 100 is cooled conventionally, for example by active cooling or by
Werkzeugmasse. Tool mass.
Das erfindungsgemäße Verfahren zur Herstellung von bruchresistenten Krägen eines pressgehärteten Bauteils zeichnet sich dadurch aus, dass der vor oder während des Warmumformungsprozesses in das Bauteil eingefahrene Stempel 108 während des ganzen Umformungsprozesses so temperiert wird, dass eine Martenbildung im Bereich des Kragens unterbleibt, so dass sich hier lokal ein weiches Mischgefüge mit erhöhter Bruchdehnung und Duktilität ausbildet, während der übrige Bereich des Bauteils 106 durch hohe The method according to the invention for producing break-resistant collars of a press-hardened component is characterized in that the stamp 108 introduced into the component before or during the hot-forming process is tempered during the entire forming process so that molding does not take place in the region of the collar, so that here locally forms a soft mixed structure with increased elongation at break and ductility, while the rest of the area of the component 106 by high
Abkühlungsraten maximal gehärtet wird. Der kragenziehende Stempel 108 verbleibt während des gesamten Härtungsprozesses in dem Durchzug 1 14 und wird aktiv temperiert durch die Mittel 1 10 zur Temperierung. Durch ständige angepasste Temperierung des Stempels 108 bleibt die Temperatur im Bauteil 106 im lokalen Bereich des Kragens 1 12 immer oberhalb der Martensit-Starttemperatur, sodass lokal ein Bereich hoher Duktilität und Bruchdehnung sowie ein Kragenziehen ohne Kantenreißer ermöglicht wird. Vorzugsweise wird ein den Durchzug 1 14 umlaufender Bereich 124 nicht vollständig gehärtet, um einen stetigen Übergang zwischen dem vollständig gehärteten Bereich und dem Bereich geringerer Festigkeit zu schaffen. Der umlaufende Bereich 124 beträgt insbesondere maximal das 2- fache, vorzugsweise maximal das 1 ,5-fache des Durchmessers D des Durchzuges. Dieser Bereich 124 lässt sich durch die im Ober- und Unterwerkzeug 102, 104 integrierten Mittel 120, 122 einstellen. Die Mittel 120, 122 können temperiert sein oder aus einem schlecht, wärmeleitenden Material, beispielsweise aus einer Keramik ausgebildet sein. Vorzugsweise umfasst mindestens das Mittel 120 eine Isolierung zur thermischen Trennung zwischen dem temperierten Stempel 108 und dem vorzugsweise aktiv gekühlten Oberwerkzeug 102. Cooling rate is maximum hardened. The collar-pulling punch 108 remains during the entire curing process in the passage 1 14 and is actively tempered by the means 1 10 for temperature control. By constantly adjusting the temperature of the punch 108, the temperature in the component 106 in the local region of the collar 1 12 always remains above the martensite start temperature, so that locally a range of high ductility and elongation at break and a collar pull without edge ripper is made possible. Preferably, a region 124 passing through the passageway 14 is not fully cured to provide a smooth transition between the fully cured region and the lesser region To create strength. The circumferential region 124 is in particular at most twice, preferably at most 1.5 times the diameter D of the passage. This area 124 can be adjusted by the means 120, 122 integrated in the upper and lower tool 102, 104. The means 120, 122 may be tempered or formed from a poorly heat-conductive material, for example from a ceramic. Preferably, at least the means 120 comprises insulation for thermal separation between the tempered die 108 and the preferably actively cooled upper tool 102.
Materialverschleißerscheinungen, verursacht durch Dauerschwingbelastungen durch weitere angekoppelte Bauteile, oder Spannungsspitzen, hervorgerufen beim Zusammenbau von verschiedenen Bauteilen, kann durch die lokal differenzierte Materialhärte effektiv entgegengewirkt werden. Die Lebensdauer von verbundenen Bauteilen kann signifikant verlängert werden und die Sicherheit z.B. eines Mehr-Komponenten-Fahrzeuggestells erheblich gesteigert werden. Material wear and tear, caused by fatigue loading by other coupled components, or voltage peaks, caused by the assembly of different components, can be effectively counteracted by the locally differentiated material hardness. The service life of connected components can be extended significantly and the safety of, for example, a multi-component vehicle frame can be significantly increased.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
100 Vorrichtung zum Warm umformen, insbesondere zum Presshärten100 apparatus for hot forming, in particular for press hardening
102 Oberwerkzeug 102 upper tool
104 Unterwerkzeug  104 lower tool
106 Bauteil  106 component
108 Stempel  108 stamp
1 10 Mittel zur Temperierung  1 10 Medium for temperature control
1 12 Kragen  1 12 collar
1 14 Durchzug  1 14 passage
1 16 erste Aussparung  1 16 first recess
1 18 zweite Aussparung  1 18 second recess
120 Mittel  120 funds
122 Mittel  122 funds
124 umlaufender Bereich  124 circumferential area
D Durchmesser  D diameter

Claims

PATENTANSPRÜCHE
1. Verfahren zur Herstellung eines pressgehärteten Bauteils (106), welches einen 1. A method for producing a press-hardened component (106), which is a
Durchzug (1 14) mit einem an der Peripherie des Durchzugs (1 14) ausgebildeten Kragen (1 12) umfasst, dadurch charakterisiert, dass vor oder während der  Torsion (1 14) with a at the periphery of the passage (1 14) formed collar (1 12), characterized in that before or during the
Presshärtung des Bauteils (106) ein temperierter Stempel (108) in den Durchzug Press hardening of the component (106) a tempered punch (108) in the passage
(1 14) eingefahren wird, wobei der temperierte Stempel (108) derart temperiert wird, dass die Temperatur im Bereich des Kragens (1 12) oberhalb der Martensit- Starttemperatur des eingesetzten Stahlwerkstoffes gehalten wird. (1 14) is retracted, wherein the tempered punch (108) is tempered such that the temperature in the region of the collar (1 12) above the martensite start temperature of the steel material used is maintained.
2. Verfahren nach Anspruch 1 , wobei der während der Presshärtung des Bauteils (106) eingefahrene temperierte Stempel (108) während des vollständigen Prozesses der Presshärtung in dem Durchzug (1 14) verbleibt. 2. The method of claim 1, wherein the retracted during the press-curing of the component (106) tempered punch (108) during the entire process of press-hardening in the passage (1 14) remains.
3. Verfahren nach Anspruch 1 oder 2, wobei der übrige Teil des Bauteils (106) während der Presshärtung aktiv abgekühlt wird. 3. The method of claim 1 or 2, wherein the remaining part of the component (106) is actively cooled during the press-hardening.
4. Verfahren nach einem der vorgenannten Ansprüche, wobei ein Oberwerkzeug (102) des Presshärtewerkzeugs dazu ausgebildet ist, den temperierten Stempel (108) ausfahrbarbar und formschlüssig in einer ersten Aussparung aufzunehmen. 4. The method according to any one of the preceding claims, wherein an upper tool (102) of the press-hardening tool is adapted to receive the tempered punch (108) extendable and positively in a first recess.
5. Verfahren nach einem der vorgenannten Ansprüche, wobei ein Unterwerkzeug (104) des Presshärtewerkzeugs dazu ausgebildet ist, den temperierten Stempel (108) in einer ausgefahrenen Position und den Kragen (1 12) in einer zweiten Aussparung formschlüssig aufzunehmen, wobei die zweite Aussparung (1 18) der ersten 5. The method according to any one of the preceding claims, wherein a lower tool (104) of the press-hardening tool is adapted to form-fit the tempered punch (108) in an extended position and the collar (1 12) in a second recess, wherein the second recess ( 1 18) of the first
Aussparung gegenüber liegt und einen größeren Radius oder Durchmesser aufweist als die erste Aussparung (1 16).  Recess opposite and has a larger radius or diameter than the first recess (1 16).
6. Verfahren nach einem der vorgenannten Ansprüche, wobei durch die Geometrie des temperierten Stempels (108) die Geometrie des Durchzugs (1 14) und durch eine Hubweite des Ausfahrens des temperierten Stempels (108) eine Höhe des Kragens (1 12) bestimmt wird. 6. The method according to any one of the preceding claims, wherein the geometry of the tempered punch (108), the geometry of the passage (1 14) and by a stroke of the extension of the tempered punch (108) a height of the collar (1 12) is determined.
7. Vorrichtung (100) zur Herstellung eines pressgehärteten Bauteils (106), welches einen Durchzug (1 14) mit einem an der Peripherie des Durchzugs (1 14) 7. Device (100) for producing a press-hardened component (106) which has a passage (1 14) with a at the periphery of the passage (1 14)
ausgebildeten Kragen (1 12) umfasst, wobei zur Herstellung des pressgehärteten Bauteils (106) ein Presshärtewerkzeug verwendet wird, dadurch charakterisiert, dass die Vorrichtung (100) ferner einen temperierten Stempel (108) aufweist, welcher dazu ausgebildet ist, vor oder während der Presshärtung des Bauteils (106) in den  formed collar (1 12), wherein for the production of the press-hardened component (106) a press-hardening tool is used, characterized in that the device (100) further comprises a tempered punch (108) which is formed before or during the press-hardening of the component (106) in the
Durchzug (1 14) eingefahren zu werden und dabei derart temperiert zu werden, dass die Temperatur im Bereich des Kragens (1 12) oberhalb der Martensit-Starttemperatur des eingesetzten Stahl Werkstoff es gehalten wird.  Tension (1 14) to be retracted and thereby tempered so that the temperature in the region of the collar (1 12) above the martensite start temperature of the steel material used is maintained.
8. Vorrichtung (100) gemäß Anspruch 7, wobei das Presshärtewerkzeug ein 8. Device (100) according to claim 7, wherein the press hardening tool a
Oberwerkzeug (102) und ein Unterwerkzeug (104) umfasst, wobei in dem  Upper tool (102) and a lower tool (104), wherein in the
Oberwerkzeug (102) der Stempel (108) ausfahrbar und formschlüssig in einer ersten Aussparung eingebettet ist, und das Unterwerkzeug (104) eine zweite Aussparung (1 18) zur formschlüssigen Aufnahme des Stempels (108) in einer ausgefahrenen Position aufweist, wobei der Stempel (108) Mittel zur Temperierung (1 10) aufweist.  Upper die (102) of the punch (108) extendable and positively embedded in a first recess, and the lower die (104) has a second recess (1 18) for positive reception of the punch (108) in an extended position, wherein the punch ( 108) comprises means for temperature control (1 10).
EP15735879.7A 2014-07-11 2015-06-26 Method and apparatus for producing a press-quenched part Not-in-force EP3166737B1 (en)

Applications Claiming Priority (2)

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DE102014109773.4A DE102014109773A1 (en) 2014-07-11 2014-07-11 Method for producing a press-hardened component
PCT/EP2015/064542 WO2016005210A1 (en) 2014-07-11 2015-06-26 Method for producing a press-quenched part

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CN (1) CN106488813B (en)
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DE102017204833A1 (en) 2017-03-22 2018-09-27 Audi Ag Method and device for producing a sheet metal passage
WO2019239598A1 (en) * 2018-06-15 2019-12-19 ユニプレス株式会社 Method for manufacturing press-formed article, and press-formed article

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SE9602257L (en) * 1996-06-07 1997-12-08 Plannja Hardtech Ab Ways to produce steel detail
DE10120919A1 (en) * 2001-04-27 2002-10-31 Benteler Automobiltechnik Gmbh Process for producing a hardened sheet metal profile
DE10149220C1 (en) 2001-10-05 2002-08-08 Benteler Automobiltechnik Gmbh Process for producing a hardened sheet metal profile
CN2587545Y (en) 2002-12-18 2003-11-26 中国科学院金属研究所 Drop stamping device for magnesium alloy sheet material
DE102005025026B3 (en) 2005-05-30 2006-10-19 Thyssenkrupp Steel Ag Production of metal components with adjacent zones of different characteristics comprises press-molding sheet metal using ram and female mold, surfaces of ram which contact sheet being heated and time of contact being controlled
FR2889466B1 (en) * 2005-08-05 2008-12-19 Thyssenkrupp Sofedit MANUFACTURE OF A METALLIC PIECE BY HOT STAMPING AND PIECE OBTAINED
CN201157870Y (en) 2007-12-27 2008-12-03 彩虹集团电子股份有限公司 Thermoforming die for shadow mask
CN101987333A (en) 2009-08-07 2011-03-23 上海重型机器厂有限公司 Punch forming method for large seal head of pressure vessel of nuclear power equipment
DE102011117066B4 (en) 2011-10-27 2022-10-13 Benteler Automobiltechnik Gmbh Device for producing a hot-formed and press-hardened motor vehicle body component and method for production
FR2996473A1 (en) * 2012-10-10 2014-04-11 Renault Sa Manufacturing piece of material susceptible to quenching in automotive industry, comprises forming collar in workpiece during hot stamping phase and at beginning of deep-drawing phase
CN103381440B (en) 2013-06-03 2016-03-02 湖北三江航天红阳机电有限公司 A kind of thermo shaping method of Ti Alloy Curved part

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ES2668807T3 (en) 2018-05-22
CN106488813A (en) 2017-03-08
WO2016005210A1 (en) 2016-01-14
US20170226603A1 (en) 2017-08-10
CN106488813B (en) 2018-08-28
DE102014109773A1 (en) 2016-01-14
EP3166737B1 (en) 2018-02-28
MX2016017369A (en) 2017-04-27

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