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WO2000005043A1 - Chaine de scie resistant au froid - Google Patents

Chaine de scie resistant au froid Download PDF

Info

Publication number
WO2000005043A1
WO2000005043A1 PCT/SE1998/001411 SE9801411W WO0005043A1 WO 2000005043 A1 WO2000005043 A1 WO 2000005043A1 SE 9801411 W SE9801411 W SE 9801411W WO 0005043 A1 WO0005043 A1 WO 0005043A1
Authority
WO
WIPO (PCT)
Prior art keywords
links
saw chain
drive
cutter
hardness
Prior art date
Application number
PCT/SE1998/001411
Other languages
English (en)
Inventor
Bruce Ionson
Original Assignee
Kapman Ab
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 Kapman Ab filed Critical Kapman Ab
Priority to PCT/SE1998/001411 priority Critical patent/WO2000005043A1/fr
Publication of WO2000005043A1 publication Critical patent/WO2000005043A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains

Definitions

  • Chain saws using saw chain are used to harvest logs for saw mills and pulp manufacture. They can be hand held or mounted on a harvester vehicle. Logging is to a large extent done in wintertime, since forests in northern regions often grow on moist or boggy grounds which are difficult to traverse with powered vehicles in summer but less difficult when frozen in winter. Wintertime logging in frozen forests requires saw chain which can retain its toughness at those temperatures and there have been many attempts to find specific alloys which can stand sub-zero temperatures without embrittlement, as described in patents US 3,854,363 and EP 745 696. A problem with these has been, however, that they may be either too soft to make a durable cutting edge, or that they may be difficult to cut into blanks for the chain links.
  • the present invention concerns a method to manufacture saw chain which combines toughness at low temperatures with adequate edge durability, while using a low cost easily machined steel alloy.
  • a saw chain according to the invention is described with reference to figure 1, which shows a portion of such a saw chain and the links it is composed from.
  • the saw chain comprises drive links (10) which extend below the other links, side links (11) on both sides of the drive links, and cutter links (12) which are similar to side links but carry cutters (14) with cutting edges (15) and depth gages (16).
  • Side links and cutter links are rigidly joined together with rivets (13) which penetrate through holes in the drive links to ensure flexibility of the chain.
  • the lower side extensions of the drive links (10) run in a groove in an edge of a guide bar to guide the saw chain along the guide bar.
  • the saw chain is also propelled along the guide bar by teeth of a drive sprocket acting upon the rear contour of the lower side extensions of the drive links.
  • All or some of the drive links may also carry upper side extensions to reduce impact of the depth gages against the wood to be cut. Failure of steel components exposed to vibration and numerous small impacts usually occurs through gradual growth of small initial cracks until the crack has grown so far through the component that the remaining section is too small. Large numbers of small initial cracks are found in deformation zones at cut metal surfaces or where metal pieces rub against each other without sufficient lubrication.
  • the rubbing is especially dangerous at low temperatures where the lubricant becomes too stiff to spread over the surfaces, and crack growth is usually much more rapid at low temperatures.
  • the cutter links (12) are made with a high enough hardness to make a durable cutting edge (15), and the drive links (10) with a much lower hardness.
  • Side links (11) other than cutter links may preferably have the same hardness as the cutter links (12), to make the rivet connections symmetric.
  • a typical steel alloy for saw chain is AISI 8660 containing 0.5 to 0.9 % C, 0.3 to 0.7 % Cr, 0.3 to 0.7 % Mn, 0.5 to 1.0 % Ni and 0.1 to 0.3 % Mo.
  • the cutter links (12) it is hardened and quenched to HRC 52 to 55, which makes an excellent edge sharpness.
  • the toughness of such a link decreases strongly at low temperature, but since stresses are low in this cutter link, except at the cutting edge, the strength is sufficient, and since the edge is heated by friction in use, its toughness is not critical.
  • the quenching is done in a salt bath at higher temperature 325-350 C for at least five minutes, which produces a hardness of 45 to 49 HRC.
  • Such a drive link has a higher toughness, which makes it much less prone to crack growth than if it had been heat treated like the cutter link.
  • the side links (11) may preferrably be heat treated like the cutter links.
  • these can be made with greater thickness in their upper portions between the side links, and with a smaller thickness in their lower extensions running in the guide bar groove. This also allows a higher chain speed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

Cette invention concerne une chaîne de scies à chaîne, y compris pour modèles de scie montés sur véhicules, avec maillons d'entraînement, maillons latéraux et maillons de coupe, sur laquelle les maillons d'entraînement ont reçu un traitement thermique différent de celui des autres maillons qui leur confère une moindre dureté et une plus grande robustesse aux températures hivernales très basses.
PCT/SE1998/001411 1998-07-24 1998-07-24 Chaine de scie resistant au froid WO2000005043A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE1998/001411 WO2000005043A1 (fr) 1998-07-24 1998-07-24 Chaine de scie resistant au froid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1998/001411 WO2000005043A1 (fr) 1998-07-24 1998-07-24 Chaine de scie resistant au froid

Publications (1)

Publication Number Publication Date
WO2000005043A1 true WO2000005043A1 (fr) 2000-02-03

Family

ID=20411053

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001411 WO2000005043A1 (fr) 1998-07-24 1998-07-24 Chaine de scie resistant au froid

Country Status (1)

Country Link
WO (1) WO2000005043A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651938A (en) * 1995-05-01 1997-07-29 Blount, Inc. High strength steel composition having enhanced low temperature toughness
US5707460A (en) * 1995-07-11 1998-01-13 Porter-Cable Corporation Method of producing parts having improved wear, fatigue and corrosion resistance from medium alloy, low carbon steel and parts obtained therefrom

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651938A (en) * 1995-05-01 1997-07-29 Blount, Inc. High strength steel composition having enhanced low temperature toughness
US5772957A (en) * 1995-05-01 1998-06-30 Blount, Inc. High strength steel composition having enhanced low temperature toughness
US5707460A (en) * 1995-07-11 1998-01-13 Porter-Cable Corporation Method of producing parts having improved wear, fatigue and corrosion resistance from medium alloy, low carbon steel and parts obtained therefrom

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