EP0908530A1 - Lame pour une scie ou un couteau et procédé de fabrication - Google Patents

Lame pour une scie ou un couteau et procédé de fabrication Download PDF

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Publication number
EP0908530A1
EP0908530A1 EP98118991A EP98118991A EP0908530A1 EP 0908530 A1 EP0908530 A1 EP 0908530A1 EP 98118991 A EP98118991 A EP 98118991A EP 98118991 A EP98118991 A EP 98118991A EP 0908530 A1 EP0908530 A1 EP 0908530A1
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EP
European Patent Office
Prior art keywords
nitrogen
steel
base sheet
hrc
hardness
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
EP98118991A
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German (de)
English (en)
Other versions
EP0908530B1 (fr
Inventor
Karl-Hermann Wirths
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.)
C. AUGUST HUECHELBACH GMBH & CO. KG
Original Assignee
C August Huechelbach KG
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Application filed by C August Huechelbach KG filed Critical C August Huechelbach KG
Publication of EP0908530A1 publication Critical patent/EP0908530A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces

Definitions

  • the invention relates to a base sheet or base material according to the generic term of claim 1.
  • a basic material for the production of master sheets for circular saws, cutting discs, frame saws and Cutting and scraping devices is from the European Patent application EP 0 751 234 known.
  • the base sheet instead of a steel, whose carbon content is between 0.25 and 1 percent is a low-carbon base steel (case hardening steel) with a carbon content of 0.1 to 0.2 Percent used. Carbon is then added to this steel carburized so that from its outer wall areas towards the inner core a carburized area with a from the outer edge of the outer wall to the non-carburized one Decreasing carbon content is present.
  • the Depth of the carburized area is said to be selected be that after hardening and tempering a third the total thickness of the base steel is soft and two thirds stay strong. The core remains unhardened.
  • the two-sided Carburizing is used to make a sandwich-like raw material for the saw industry. It should be one higher hardness on the surface with the same operating or Break resistance can be achieved and noise emissions be reduced in operation.
  • the invention has for its object a base sheet or a method for producing a base sheet to specify at which while reducing leaf warming a reduced cutting width during operation simultaneous increase in cutting speed is possible.
  • nitrogen and to a lesser extent carbon diffuses superficially into the base steel, with nitrogen uptake dominating.
  • Carbonitrides and in lower zones nitrides.
  • the process parameters are chosen so that a connection zone with subsequent diffusion zone.
  • the ceramic-like character of this Surface has the character of a lubricant.
  • the thermotechnical Treatment takes place at temperatures below 600 ° Celsius, i.e. at temperatures far below of case hardening, where only carbon up to deep layers is diffused. At these temperatures is the solvent power of steel for carbon very low.
  • the diffusion parameters of nitrogen diffusion are chosen so that the diffusion zone protrudes up to a maximum of 400 micrometers into the core material.
  • the diffusion depth is preferably Nitrogen 200 microns. But it is also planned that the diffusion depth is only 100 microns is.
  • the surface hardness 300 to 400 HV.
  • the surface hardness can be 500 to 650 HV 1.
  • higher alloyed steels chrome, vanadium, Molybdenum
  • the hardness at 300 to 450 HV 1 (32 and 50 HRC) lie. It is preferably there depending on the selected one Steel quality in the range between 350 and 430 HV (38 up to 48 HRC).
  • Base steel is a tempered material, especially a martensitic steel can be chosen overall better material properties.
  • the nitrogen and carbon content near the surface Connection zone is almost constant.
  • the nitrogen concentration in contrast, in the diffusion zone continuously with a constant over wide ranges Gradients down to the core concentration.
  • the core concentration which can also be zero, becomes after 400 micrometers reached. As a result of this concentration gradient there is a continuous drop in hardness in the Diffusion zone to the core area.
  • Such steels can also be used as basic steels with vanadium, chrome or molybdenum or Are alloyed with nickel. Regarding such steels to the article by H. Berns: "Tools made of martensitic Stahl in 292 Z w F 66 (1971), Issue 6 "noted.
  • the diffusion in accordance with the invention is carried out by a process called nitro carburizing at temperatures up to 570 ° Celsius.
  • the temperature is preferably above 480 ° Celsius.
  • Nitrogen can be used in carbides Replace part of the carbon and in the carbides are recorded, forming carbonitrides.
  • the steel can before Treatment to improve its core properties be compensated. With a previous remuneration or tempering treatment, however, the tempering temperature must 20 ° to 30 ° higher than the treatment temperature in thermochemical treatment. But it can also lie lower. Then another start takes place in Core.
  • Nitro carburizing can be done in a gas as well as by applied powder.
  • carbon and Nitrogen in a mixture of ammonia and one Carburizing gas.
  • lime nitrogen used as a powder.
  • the amount of carbon diffused in is essential less than that of nitrogen. Nitro carburization but is preferably done in a salt bath.
  • the base sheets so made, either later hard metal cutting edges are soldered or diamond rubbers applied or incised teeth can be up to approx. 500 ° in operation Warm up Celsius without any harmful conversion he follows.
  • the technology according to the invention allows the thickness to reduce the saw blades.
  • a base sheet with a diameter of 400 millimeters which for example has a wall thickness of 3 millimeters the wall thickness to 2.4 millimeters or even less be reduced. A 20% reduction is possible.
  • the internal residual stresses built up compensate for the reduction in thickness Dimensional stability. The fatigue strength is significantly increased.
  • a layer material (sediment material) is created with a hardened or tempered core, which, in contrast to the known layer material, is not is soft, but a uniform martensite structure having.
  • the material initially forms one hardened zone with increasing nitrogen content towards the edge out.
  • the connection layer directly on the edge forms special nitro carbides and has a smooth surface.
  • the hardening takes place during the diffusion phase and can be achieved without quenching.
  • the treatment temperature is comparatively low.
  • a Variant of the method can be 520 to 560 °.
  • the process is alloyed on all types of steel or not alloyed, applicable. That is advantageous Increase in fatigue strength, corrosion resistance and the temperature resistance.
  • the nitrided Layer retains its high hardness up to approx. 500 ° Celsius.
  • the combination of reducing heat generation on the one hand smooth connection zone with the other hand the high temperature stability allows higher wear resistance and better sliding properties.
  • the one with the Manufacturing accompanying large residual compressive stress allowed the production of thin saw blades with the same Stability. With the manufacturing goes a big one Bracing that allows thin saw blades to produce without fluttering at high speeds occurs.
  • a base steel can be both carbon-rich as well low carbon steel can be used. Is preferred but such a steel is used without any after-treatment is hardenable, a base steel with from the edge to Core constant carbon content. In the base steel becomes bilateral due to the thermochemical treatment in the near-surface area nitrogen and Carbon diffused.
  • the hardness profiles in the 5 are shown with the letters A, B, C, refer to a circular saw blade, as in the 1 and 2 is shown.
  • the basic saw blade 1 forms two opposite surfaces 3, 4 and has tooth-like extensions that the carbide plates 2, which form the saw teeth.
  • the Width of the hard metal plate 2 is larger than that Strength of the base sheet 1, so that the actual cutting activity from the hard metal plate 2 and not from the one that is nitro-carburized on both sides in the area near the surface Base sheet is exercised.
  • Example A is a so-called CV2 steel with a core hardness of 438 HV 1.
  • a surface hardness is formed from 707 to 720 HV 1.
  • the depth of hardness is 0.09 mm and the connection layer thickness is 3 to 4 Micrometer. So nitro carburizing only the outermost thin surface layer with carbon enriched, which is a nitrogen-carbon compound acts. To deeper areas of the The base sheet then takes the nitrogen concentration steadily.
  • the Hardness gradient in the near-surface area 2.9 HV 1 pro Micrometer or 0.148 HRC per micrometer.
  • Example B is a type steel 032 with a core hardness of 376 HV 1 Nitro carburizing surface hardness is 614 up to 624 HV 1. The hardness depth is 0.1 mm and the Link layer thickness 4 to 5 microns. The hardness gradient on the surface is 4 HV 1 per micrometer or 0.22 HRC per micron.
  • Example C a steel with the designation S2 was used used, the core hardness is 375 HV 1. After this Nitro carburizing has a surface hardness of 695 to 705 HV 1. The hardness depth is 0.09 mm and the connecting layer thickness 3 to 4 microns. The hardness gradient in the area near the surface is 3 HV 1 per micrometer or 0.18 HRC per micron.
  • Nitro carburizing becomes a ceramic smooth, high sliding properties steel surface produced, so that warming is minimized when sawing and also the abrasion from the wood to be sawn.
  • 3 and 4 is a section in cross section a master sheet for a circular knife is shown.
  • the Steel thickness is 5 mm. While it is with the steels Examples A to C for low-alloy steels acted, it is the embodiment, 3 and 4, to a high-alloy Steel.
  • the course of the Vickers hardness is in the Fig. 6 shown.
  • Fig. 3 represents the base sheet for a circular knife in which there is still no cutting edge. This takes place only after nitro carburizing a corresponding removal of material from the surface, so that the tapered surface sections 13, 14 of the base sheet 11 by training form a cutting edge 15 on both sides.
  • the cutting edge 15 in one material lies outside the nitrogen diffusion range, namely in the middle of the sheet.
  • the high-alloy steel is nitro-carburized on both sides such that the surface hardness is 1,150 HV 1. In the core area the hardness is around 540 HV 1. The The gradient near the surface is around 7 HV 1 per micrometer or 0.3 HRC per micrometer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Knives (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
EP98118991A 1997-10-09 1998-10-08 Lame pour une scie ou un couteau et procédé de fabrication Expired - Lifetime EP0908530B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19744512 1997-10-09
DE19744512A DE19744512A1 (de) 1997-10-09 1997-10-09 Basisblatt oder Basismaterial für ein Stammblatt, Kreissägeblatt, Trennsägeblatt, Kreismesser, Maschinenmesser

Publications (2)

Publication Number Publication Date
EP0908530A1 true EP0908530A1 (fr) 1999-04-14
EP0908530B1 EP0908530B1 (fr) 2002-09-04

Family

ID=7844988

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98118991A Expired - Lifetime EP0908530B1 (fr) 1997-10-09 1998-10-08 Lame pour une scie ou un couteau et procédé de fabrication

Country Status (4)

Country Link
EP (1) EP0908530B1 (fr)
AT (1) ATE223513T1 (fr)
DE (2) DE19744512A1 (fr)
ES (1) ES2180106T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018194511A1 (fr) * 2017-04-21 2018-10-25 Husqvarna Ab Lame de coupe et procédé de fabrication d'une telle lame

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006054022B4 (de) * 2006-11-16 2012-05-24 Xaver Mayer Sägekette für Motorkettensäge
DE102012106351B4 (de) 2012-07-13 2015-11-19 C. & E. Fein Gmbh Sägeblatt oder Trennschleifblatt aus martensitischem Edelstahl oder Stahl sowie Verfahren zu dessen Herstellung
DE102021125083A1 (de) 2021-09-28 2023-03-30 Sprick Gmbh Bielefelder Papier- Und Wellpappenwerke & Co. Guillotine-Abtrennstation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105549A1 (en) * 1971-02-06 1972-08-10 Zahnradfabrik Friedrichshafen Nitriding iron and ferroalloys - using gaseous nitrogen-contg cpds with org additive
DE2228746A1 (de) * 1971-06-15 1972-12-21 Statni Vyzkumny Ustav Material Verfahren zur Herstellung von bei tiefer Temperatur karbonitnerten Schichten an Eisenlegierungen mit höherem Kohlenstoffgehalt
EP0555694A2 (fr) * 1992-02-12 1993-08-18 Esm Ennepetaler Schneid- Und Mähtechnik Gmbh & Co. Kg Procédé de fabrication d'une lame en acier pour les domaines agricole et forestier
EP0751234A1 (fr) * 1995-06-30 1997-01-02 CARL AUG. PICARD GMBH & CO. KG. Matériaux de base pour la fabrication de lames de scie pour scie circulaire, scies à cadre, meules tronçonneuses et de dispositifs de coupage ou de raclage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105549A1 (en) * 1971-02-06 1972-08-10 Zahnradfabrik Friedrichshafen Nitriding iron and ferroalloys - using gaseous nitrogen-contg cpds with org additive
DE2228746A1 (de) * 1971-06-15 1972-12-21 Statni Vyzkumny Ustav Material Verfahren zur Herstellung von bei tiefer Temperatur karbonitnerten Schichten an Eisenlegierungen mit höherem Kohlenstoffgehalt
EP0555694A2 (fr) * 1992-02-12 1993-08-18 Esm Ennepetaler Schneid- Und Mähtechnik Gmbh & Co. Kg Procédé de fabrication d'une lame en acier pour les domaines agricole et forestier
EP0751234A1 (fr) * 1995-06-30 1997-01-02 CARL AUG. PICARD GMBH & CO. KG. Matériaux de base pour la fabrication de lames de scie pour scie circulaire, scies à cadre, meules tronçonneuses et de dispositifs de coupage ou de raclage

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
F. HOFFMANN ET AL: "VERSCHLEISSWIDERSTAND NITRIERTER UND NITROCARBURIERTER STÄHLE", HÄRTEREI TECHNISCHE MITTEILUNGEN, vol. 52, no. 6, 1997, pages 376 - 386, XP000735232 *
H. BERNS: "Werkzeuge aus martensitaushärtendem Stahl", ZEITSCHRIFT FÜR WIRTSCHAFTLICHE FERTIGUNG, vol. 66, no. 6, 1971, München, DE, pages 292 - 295, XP002091401 *
UWE VOLKER MÜNZ: "Dynamisches Prüfen von Kreissägeblättern", MASCHINENMARKT, vol. 103, no. 4, 1997, Würzburg, DE, pages 26 - 31, XP002091400 *
W. LERCHE ET AL.: "Gasoxinitrieren von Schneid-, Umform- und Zerspanungswerkzeugen", NEUE HÜTTE, vol. 36, no. 5, May 1991 (1991-05-01), Leipzig, DE, pages 184 - 187, XP002091402 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018194511A1 (fr) * 2017-04-21 2018-10-25 Husqvarna Ab Lame de coupe et procédé de fabrication d'une telle lame
RU2720283C1 (ru) * 2017-04-21 2020-04-28 Хускварна Аб Режущее полотно и способ изготовления такого полотна
US11701724B2 (en) 2017-04-21 2023-07-18 Husqvarna Ab Cutting blade and method for producing such a blade

Also Published As

Publication number Publication date
DE19744512A1 (de) 1999-04-15
ATE223513T1 (de) 2002-09-15
ES2180106T3 (es) 2003-02-01
DE59805388D1 (de) 2002-10-10
EP0908530B1 (fr) 2002-09-04

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