EP3590622B1 - Outil de durcissement sous presse - Google Patents

Outil de durcissement sous presse Download PDF

Info

Publication number
EP3590622B1
EP3590622B1 EP19180184.4A EP19180184A EP3590622B1 EP 3590622 B1 EP3590622 B1 EP 3590622B1 EP 19180184 A EP19180184 A EP 19180184A EP 3590622 B1 EP3590622 B1 EP 3590622B1
Authority
EP
European Patent Office
Prior art keywords
tool
press hardening
contact layer
nickel
tool core
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.)
Active
Application number
EP19180184.4A
Other languages
German (de)
English (en)
Other versions
EP3590622A1 (fr
Inventor
Jürgen Möller
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.)
KME Special Products GmbH and Co KG
Original Assignee
KME Special Products GmbH and Co KG
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 KME Special Products GmbH and Co KG filed Critical KME Special Products GmbH and Co KG
Publication of EP3590622A1 publication Critical patent/EP3590622A1/fr
Application granted granted Critical
Publication of EP3590622B1 publication Critical patent/EP3590622B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/01—Selection of materials
    • 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
    • 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
    • B21D37/20—Making tools by operations not covered by a single other subclass

Definitions

  • the invention relates to a press hardening tool having the features in the preamble of claim 1.
  • a press hardening tool is for example in US 2015/246383 A1 disclosed.
  • Press hardening tools are subject to high alternating thermal loads. This leads to a very limited tool life. The relatively frequent replacement of tools has a negative effect on manufacturing costs. Particularly highly stressed areas are located between the tool surface of the press hardening tool and cooling channels. The combined mechanical and thermal stress leads to premature signs of fatigue in the form of fatigue cracks. The cause of the thermal fatigue is the high temperature gradient between the tool surface and the cooling channels integrated in the tool. The closer the cooling channels are to the tool surface, the greater the temperature gradient. It is known to use composite materials for hot forming tools with a tool core and with a contact layer metallurgically connected to the tool core on a tool surface. The contact layer is designed to come into contact with a workpiece to be hot-formed.
  • the tool core is made of copper or a copper alloy and has a lower wear resistance than the material of the contact layer.
  • the DE 2727892 A1 discloses an alloy for hot forming tools which are said to be very wear-resistant and in particular has 90-97% tungsten and 2-10% iron and / or nickel and possibly 8% alloying elements such as chromium, molybdenum or cobalt.
  • alloying elements such as chromium, molybdenum or cobalt.
  • the DE 32 07 161 A1 discloses a hard material alloy for forming and cutting tools. If possible, the hard material alloy should not contain any nickel or manganese in a matrix steel alloy, because lowering the aging temperature would result in a decrease in the increase in hardness. It is therefore not a coating alloy that is to be applied to a substrate, but an alloy that forms the complete forming or cutting tool, which is produced in particular using the sintering process.
  • One of the prior art is a hot-forming tool that has at least a portion of a surface coating on a tool body.
  • the surface coating consists of a raised, metallic relief, which is completely or partially oxidized and converted into a protective layer.
  • the tool surface is predominantly oxidic.
  • the DE 10 2005 042 765 A1 discloses a further forming tool for forming a workpiece, in particular a sheet steel component.
  • the molded surface shells can be made of bronze or copper. This is intended to achieve a high effective cooling capacity.
  • EP 2 335 842 A2 referenced, relating to a further embodiment of a hot forming tool.
  • the invention is based on the object of showing a press hardening tool which has a longer service life and thus a longer service life.
  • the contact layer has at least 50% by weight of nickel or chromium.
  • the holding time in the press hardening tool can be significantly reduced in contrast to press hardening tools made of steel.
  • the wear of the tool surface, which occurs in the form of abrasion and adhesion, can be minimized by the coating.
  • the coating preferably consists of a nickel alloy.
  • the alloy in this case contains at least 50% nickel.
  • One advantage of a coating made of a nickel alloy is the good thermal conductivity, so that good heat dissipation is also made possible via the coating. Furthermore, there is a significant increase in the mechanical wear resistance of the coated surfaces of the press hardening tool.
  • the nickel content is preferably in a range between 65 and 95% by weight.
  • the nickel alloy is an alloy that contains cobalt as a further alloy component.
  • the coatings can be applied using different methods. In particular, powder flame spraying can be used.
  • the layers have a very high adhesive strength and thermal shock resistance.
  • the layer thicknesses should have a relatively small thickness which is preferably in the micrometer range.
  • the coatings preferably have a certain ductility. Compared to a consistently hard and brittle coating, coatings with ductile properties have a lower risk of damage to the coating or cracks or microcracks occurring within the coating during operation. Cracks would increase the risk of parts of the coating flaking off under mechanical stress.
  • the cooling channels could also be arranged significantly further from the tool surface.
  • the temperature gradient is smaller.
  • the local thermal load is reduced. This also gives the said press hardening tools a higher level of stability and a longer service life.
  • Another, fundamental advantage is that by reducing the hold-open time of the press hardening tool, the economy of press hardening can be increased overall, since the press hardening process causes a not inconsiderable part of the production overheads. These press hardening process costs can be reduced by increasing the thermal conductivity.
  • a high thermal conductivity of the materials used for press hardening can contribute to an increased resistance of the press hardening tool to wear and thermal fatigue and thus reduce the costs for maintenance, repair and replacement of the press hardening tools.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Coating By Spraying Or Casting (AREA)

Claims (2)

  1. Outils de durcissement à la presse constitués d'un matériau composite comportant un cœur d'outil avec une couche de contact reliée au cœur d'outil au niveau d'une surface d'outil, qui est conçue pour entrer en contact avec une pièce destinée à un thermoformage, dans lesquels le cœur d'outil est constitué de cuivre ou d'un alliage de cuivre, caractérisés en ce que la couche de contact est reliée par un procédé métallurgique au cœur d'outil et contient au moins 50 % en poids de nickel, ou de chrome, dans lesquels le cœur d'outil possède une résistance à l'usure réduite en tant que matériau de la couche de contact et dans lesquels le cœur d'outil est fixé sur un porte-outil en acier.
  2. Outils de durcissement à la presse selon la revendication 1, caractérisés en ce que la couche de contact contient 65 à 95 % en poids de nickel ou de chrome.
EP19180184.4A 2018-07-04 2019-06-14 Outil de durcissement sous presse Active EP3590622B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018116238.3A DE102018116238A1 (de) 2018-07-04 2018-07-04 Warmumformwerkzeug und Verfahren zur Herstellung eines Warmumformwerkzeuges

Publications (2)

Publication Number Publication Date
EP3590622A1 EP3590622A1 (fr) 2020-01-08
EP3590622B1 true EP3590622B1 (fr) 2020-09-30

Family

ID=66866976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19180184.4A Active EP3590622B1 (fr) 2018-07-04 2019-06-14 Outil de durcissement sous presse

Country Status (3)

Country Link
EP (1) EP3590622B1 (fr)
DE (1) DE102018116238A1 (fr)
ES (1) ES2836204T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116083834A (zh) * 2021-11-05 2023-05-09 中国石油天然气集团有限公司 一种WC-Co-Cu-稀土耐磨耐蚀涂层材料及其制备方法和使用方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355922A1 (fr) * 1976-06-23 1978-01-20 Eurotungstene Outil de travail a chaud des metaux
DE3207161C2 (de) * 1982-02-27 1984-05-10 Thyssen Edelstahlwerke AG, 4000 Düsseldorf Hartstofflegierung
DE102005042765C5 (de) * 2005-09-08 2013-01-03 Voestalpine Automotive Gmbh Formwerkzeug
DE102009058657A1 (de) * 2009-12-16 2011-06-22 Benteler Automobiltechnik GmbH, 33102 Verfahren zur Herstellung eines Warmformwerkzeugs und Warmformwerkzeug mit Verschleißschutz
US20150246383A1 (en) * 2014-02-28 2015-09-03 Ford Motor Company System and process for producing a metallic article
DE102014016502A1 (de) * 2014-11-07 2016-05-12 Hua Guo Warmumformwerkzeug mit verstärkter Oxid-Schutzschicht

Also Published As

Publication number Publication date
DE102018116238A1 (de) 2020-01-09
EP3590622A1 (fr) 2020-01-08
ES2836204T3 (es) 2021-06-24

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