EP0864659A1 - Lame en acier pour le secteur agricole et forestier et un procédé de fabrication de cette lame - Google Patents

Lame en acier pour le secteur agricole et forestier et un procédé de fabrication de cette lame Download PDF

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Publication number
EP0864659A1
EP0864659A1 EP98102174A EP98102174A EP0864659A1 EP 0864659 A1 EP0864659 A1 EP 0864659A1 EP 98102174 A EP98102174 A EP 98102174A EP 98102174 A EP98102174 A EP 98102174A EP 0864659 A1 EP0864659 A1 EP 0864659A1
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EP
European Patent Office
Prior art keywords
blade
steel
hardness
hrc
forestry
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
EP98102174A
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German (de)
English (en)
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EP0864659B1 (fr
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.)
Busatis GmbH
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Busatis GmbH
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Filing date
Publication date
Application filed by Busatis GmbH filed Critical Busatis GmbH
Publication of EP0864659A1 publication Critical patent/EP0864659A1/fr
Application granted granted Critical
Publication of EP0864659B1 publication Critical patent/EP0864659B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools

Definitions

  • the invention relates to a blade for agricultural and forestry Steel purposes, thermally by heating and quenching is cured, and a method for producing such Blade.
  • Low carbon steel e.g. C22 or C35
  • This hardness is completely inadequate for direct use as a cutting edge, has the advantage, however, that the toughness is sufficiently high that post-treatment (tempering) is not necessary.
  • the blade by a surface hardening process, e.g. Carbonitriding, hardened in the outermost layer.
  • This hardened layer can have a hardness of 65 to 70 HRc to reach.
  • a blade made according to the procedure just described is produced and has the properties mentioned is e.g. in DE-C 42 04 000 described.
  • the object of the present invention is to provide a blade which does not have the disadvantages mentioned above.
  • the object according to the invention is achieved in that for Steel used at the beginning is micro-alloyed and has a carbon content of 0.35 to 0.50%. Preferably contains the steel 0.3 to 0.5% chromium and 0.0015 to 0.008% boron. This steel reaches a hardness in thermal hardening Oil from 48 to 58 HRc, but has a very special property, namely that it already has a high level of toughness in terms of hardness has and can therefore be left at this high hardness.
  • such a blade has a higher one Bending resistance or it can be the thickness with the same bending resistance the blade can be reduced. This is a very important advantage since this reduces the masses to be moved in translation and a lower driving force is required than wear on the drive elements is also reduced. Furthermore a thinner blade moves more easily through what is being cut also reduces the driving force required and also reduces the risk of constipation. The reduction of those to be moved Crowds are more important if you keep in mind that for example with a 9 m long cutting knife for combine harvesters approx. 120 blades are mounted.
  • the self-sharpening effect given by the difference in hardness is also by increasing the hardness of the base material compared to the blade of the prior art and thus by reducing the difference in hardness between hardness layer and base material significantly improved. It increases the service life and regrinding is less necessary be made.
  • the blade has a hardness greater than or equal to 48 HRc.
  • the blade preferably has one at least in the area of the cutting edge by a surface hardening method known per se, preferably by carbonitriding, hardened layer on the surface with a hardness of 65 to 70 HRc. This is the self-sharpening effect optimized.
  • the steel blade is made of micro-alloyed for forestry purposes Steel with a carbon content of 0.35 to 0.50% made by heating and quenching to a hardness greater brought 48 HRc and through a known surface hardening process, preferably by carbonitriding on the surface, brought to a hardness of 65 to 70 HRc.
  • the blade is preferably made of steel with 0.3 to 0.5% chromium and 0.0015 to 0.008% boron.
  • a blade hardened according to the invention is produced, for example, as follows: It becomes a steel blade with 0.42% C, 0.28% Si, 1.13% Mn, 0.012% P, 0.001% S, 0.40% Cr, 0.03% Ni, 0.041% Ti and 0.0030% B manufactured and hardened by heating to 900 ° C and quenching in oil. The resulting jump hardness of this blade is 54 to 56 HRc after hardening. Subsequent carbonitriding according to a known method can harden the surface layer with, for example, a surface layer thickness of 0.3 mm to 66 to 67 HRc. Despite the high values for the hardness, the material of the blade produced in this way is sufficiently tough to have sufficient break resistance when the blade is used.
  • Fig.1 is one of the form Known blade shown in a top view.
  • Fig. 2 is a stack with blades in section along the line II-II in Fig. 1 shown.
  • the blade has a body 7 with mounting holes 8 and the cutting areas 2 and 3, which are located on the cutting edge 6 connect and their hardening is crucial for the service life of the blade is.
  • the blades are stacked as in Fig. 2 stacked, the lower surface 4 of a blade 1 touches the upper Surface 5 of the underlying blade 1 and the surfaces of the Blades cover each other.
  • the diffusion of carbon and nitrogen is only found on the uncovered areas, i.e. in the cutting areas 2 and 3 and on the upper surface 5 of the top blade 1 and bottom surface 4 of bottom blade 1, instead of.
  • the cutting areas can be saved in a time-saving manner by stacking several blades simultaneously surface hardened are used, and significantly less diffusion gas is required, nevertheless takes place at the essential points, namely at the cutting edge areas 2 and 3, a hardening of the surface instead.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
EP19980102174 1997-03-12 1998-02-09 Lame en acier pour le secteur agricole et forestier et un procédé de fabrication de cette lame Expired - Lifetime EP0864659B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT42997 1997-03-12
AT42997A AT404363B (de) 1997-03-12 1997-03-12 Klinge für land- und forstwirtschaftliche zwecke aus stahl, sowie verfahren zu ihrer herstellung
AT429/97 1997-03-12

Publications (2)

Publication Number Publication Date
EP0864659A1 true EP0864659A1 (fr) 1998-09-16
EP0864659B1 EP0864659B1 (fr) 2002-05-15

Family

ID=3490384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980102174 Expired - Lifetime EP0864659B1 (fr) 1997-03-12 1998-02-09 Lame en acier pour le secteur agricole et forestier et un procédé de fabrication de cette lame

Country Status (3)

Country Link
EP (1) EP0864659B1 (fr)
AT (1) AT404363B (fr)
DE (1) DE59804112D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113857778A (zh) * 2021-09-16 2021-12-31 江苏富捷刀业有限公司 一种开垦刀的自动化流水线式加工工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE584864C (de) * 1930-05-24 1933-09-25 Thomas Harry Frost Feinschneidige duenne Klinge und Verfahren zu ihrer Herstellung
CH467866A (de) * 1963-03-06 1969-01-31 Suedwestfalen Ag Stahlwerke Vergüt- und härtbarer Stahl und Verfahren zu seiner Herstellung
DE1583982A1 (de) * 1968-01-30 1971-07-15 Friedrich Carl Huette Gmbh Sta Verwendung von Formstuecken aus borlegierten Werkzeugstaehlen als Hochverschleissbeanspruchung ausgesetzte Werkzeuge u.dgl.
US3901740A (en) * 1972-05-12 1975-08-26 Caterpillar Tractor Co Nitrided boron steel
EP0180805A1 (fr) * 1984-10-12 1986-05-14 Vereinigte Deutsche Nickel-Werke Aktien-Gesellschaft Casque en acier ou analogue
DE4143270A1 (de) * 1991-11-30 1993-06-03 Samsung Heavy Ind Borstahl
DE4204000C2 (de) * 1992-02-12 1993-11-18 Esm Ennepetaler Schneid U Maeh Klinge aus Stahl für land- und forstwirtschaftliche Zwecke sowie Verfahren zu ihrer Herstellung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE584864C (de) * 1930-05-24 1933-09-25 Thomas Harry Frost Feinschneidige duenne Klinge und Verfahren zu ihrer Herstellung
CH467866A (de) * 1963-03-06 1969-01-31 Suedwestfalen Ag Stahlwerke Vergüt- und härtbarer Stahl und Verfahren zu seiner Herstellung
DE1583982A1 (de) * 1968-01-30 1971-07-15 Friedrich Carl Huette Gmbh Sta Verwendung von Formstuecken aus borlegierten Werkzeugstaehlen als Hochverschleissbeanspruchung ausgesetzte Werkzeuge u.dgl.
US3901740A (en) * 1972-05-12 1975-08-26 Caterpillar Tractor Co Nitrided boron steel
EP0180805A1 (fr) * 1984-10-12 1986-05-14 Vereinigte Deutsche Nickel-Werke Aktien-Gesellschaft Casque en acier ou analogue
DE4143270A1 (de) * 1991-11-30 1993-06-03 Samsung Heavy Ind Borstahl
DE4204000C2 (de) * 1992-02-12 1993-11-18 Esm Ennepetaler Schneid U Maeh Klinge aus Stahl für land- und forstwirtschaftliche Zwecke sowie Verfahren zu ihrer Herstellung
EP0555694B1 (fr) * 1992-02-12 1996-06-19 Esm Ennepetaler Schneid- Und Mähtechnik Gmbh & Co. Kg Procédé de fabrication d'une lame en acier pour les domaines agricole et forestier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113857778A (zh) * 2021-09-16 2021-12-31 江苏富捷刀业有限公司 一种开垦刀的自动化流水线式加工工艺
CN113857778B (zh) * 2021-09-16 2023-12-12 江苏富捷刀业有限公司 一种开垦刀的自动化流水线式加工工艺

Also Published As

Publication number Publication date
EP0864659B1 (fr) 2002-05-15
AT404363B (de) 1998-11-25
DE59804112D1 (de) 2002-06-20
ATA42997A (de) 1998-03-15

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