EP1458531B1 - Procede de traitement plan d'une bille de bois ronde - Google Patents

Procede de traitement plan d'une bille de bois ronde Download PDF

Info

Publication number
EP1458531B1
EP1458531B1 EP02789121A EP02789121A EP1458531B1 EP 1458531 B1 EP1458531 B1 EP 1458531B1 EP 02789121 A EP02789121 A EP 02789121A EP 02789121 A EP02789121 A EP 02789121A EP 1458531 B1 EP1458531 B1 EP 1458531B1
Authority
EP
European Patent Office
Prior art keywords
block
chipper
knives
chipper knives
sawing
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.)
Expired - Fee Related
Application number
EP02789121A
Other languages
German (de)
English (en)
Other versions
EP1458531A1 (fr
Inventor
Sven-Olov Biller
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.)
Iggesund Tools AB
Original Assignee
Iggesund Tools 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 Iggesund Tools AB filed Critical Iggesund Tools AB
Publication of EP1458531A1 publication Critical patent/EP1458531A1/fr
Application granted granted Critical
Publication of EP1458531B1 publication Critical patent/EP1458531B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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
    • B27B33/20—Edge trimming saw blades or tools combined with means to disintegrate waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/007—Combined with manufacturing a workpiece

Definitions

  • the present invention relates to a method for forming a round log into a block with two or more flat lateral surfaces, comprising the steps of directly cutting into chips the material which is to be removed, by means of a block-forming assembly of the type having two or more working tools which each have the form of a rotatable drum or frustoconical body which on its circumferential surface carries a plurality of chipper knives; after the block-forming assembly, feeding the block to a sawing assembly for resawing the block to produce boards and planks, and, when sawing thick logs, reducing the feed rate of the sawing assembly and, thus, also of the block-forming assembly.
  • Block-forming assemblies of the type mentioned by way of introduction are often included in a production line of a sawmill.
  • a block-forming assembly reference is made to US-A-4456045 in which is disclosed a chipping machine having a frustoconical chipping head with circumferentially spaced chipping knives.
  • a sawing assembly is placed immediately after the block-forming assembly and the logs and blocks are fed at the same rate through the block-forming assembly and through the sawing assembly.
  • the block-forming assembly and the sawing assembly it is not unusual for the block-forming assembly and the sawing assembly to be positioned so close to each other that the front end of a log enters the sawing assembly before its rear end has left the block-forming assembly.
  • the feed rate of the block-forming assembly will be reduced when cutting thick logs, since the feed rate of the sawing assembly must be reduced owing to limitations in capacity.
  • the rotary speed of the working tools of the block-forming assembly must therefore be reduced.
  • the ratio of the rotary speed to the feed rate is in fact crucial for the length of the cut chips, i.e. how closely the chipper knives hit the log along a given length of the log.
  • the thickness of the chips on the other hand is in the first place dependent on their length in such a manner that the chips will be thinner when chopping short lengths and vice versa.
  • a larger amount of undesirable short fractions such as shavings and splits is formed. Maintaining a uniform chip size, and above all reducing the amount of shavings and splits, is of great economical importance when using chips as raw material in pulp making owing to the fact that the quality of the pulp increases and the consumption of chemicals decreases in the pulp process the more uniform the size of chips used.
  • the peripheral speed of the chipper knives will decrease, which also applies to a possible saw blade or finishing disc that is usually placed in the upper part of conical working tools to improve the quality of the flat processed surfaces.
  • the peripheral speed of chipper knives should normally be between 20 and 30 m/s for the cutting properties of the chipper knives to be optimal. Below the optimal speed, the risk of pick-ups and reduced surface smoothness increases. The speed also has a certain effect on the thickness of the chips in such a manner that a reduced speed gives thicker chips and vice versa.
  • the optimal peripheral speed of a saw blade is usually between 40 and 60 m/s below which the quality of the surfaces is deteriorated.
  • the present invention aims at obviating problems and drawbacks that are associated with a reduction of the feed rate of a block-forming assembly in the processing of thick logs. More specifically, the invention relates to a new method in which the rotary speed of the working tools can be kept or the otherwise necessary reduction of the rotary speed can at least be limited at a reduced feed rate but with a maintained chip size. At least this object is achieved by a method according to claim 1.
  • the invention is thus based on the knowledge that the above objects can be achieved by removing, from a block-forming assembly which is included in a sawing line, one or more chipper knives from each of the working tools to compensate for the reduced feed rate of the sawing assembly and, thus, of the block-forming assembly which is necessary when cutting thick logs, and thus preventing or at least limiting the reduction of the rotary speed which otherwise is necessary to maintain the desired chip size.
  • the invention is generally applicable in so far as one or more chipper knives can be removed from an arbitrary block-forming assembly, both those with frustoconical working tools and those with cylindrical working tools, for the purpose of keeping a high rotary speed.
  • the chipper knives are distributed symmetrically round the circumferential surface of the working tool.
  • the expression symmetrical distribution thus comprises also a single chipper knife in a rotary plane of the working tool since this will hit the log at the same intervals.
  • a symmetrical distribution is most easily obtained by removing exactly half of the chipper knives, i.e. by removing every second chipper knife, but can also be achieved in other ways.
  • a working tool is shown in the form of a frustoconical disc with the chipper knives arranged in two separate circumferential rings or rotary planes, an inner and an outer.
  • Each of the rings has four chipper knives.
  • two opposite chipper knives are removed from the inner ring while two opposite chipper knives are kept.
  • the feed rate of the logs can thus be reduced by half while keeping the same rotary speed and the same size of chips.
  • a blind knife has the further advantage of protecting the seats of the removed chipper knives from wear caused by logs and chips.
  • a third possibility in the shown embodiment would be removing only one chipper knife and keeping three. In such cases, however, alternative seat positions must be arranged for two of the three chipper knives that are kept in order to obtain a symmetrical distribution of the chipper knives and, thus, a uniform length of chips.
  • the working tool is provided with a feed limiter which limits the maximum feed rate of the block between the chipper knives by preventing what is called power feed.
  • the feed limiter has the form of a ring which along its outer circumference has stepped cam curves and is arranged between the top surface of the cone and a saw blade which performs finishing of the lateral surfaces of the block.
  • the feed limiter need not have the form of a ring but could consist of short arcuate sections to facilitate an exchange of the feed limiter, for instance by allowing an exchange without first having to remove an exteriorly positioned saw blade or finishing disc.
  • this feed limiter must be replaced with one having a corresponding number of cam curves.
  • Such a feed limiter is advantageous by limiting the maximum feeding of logs so that the chips will have a uniform size. In practice, it is therefore preferred to use such a feed limiter on the working tools, but it would also be possible to ensure the correct feed rate in other ways, for instance by accurate control by means of feeding rolls.
  • the working tools have the form of frustoconical discs or bodies which each have chipper knives arranged in two rings or rotary planes along the circumference of the circumferential surface. More specifically, one ring with four symmetrically distributed chipper knives at the top surface of the truncated cone and one ring with four symmetrically distributed chipper knives at a longer distance from the top surface of the truncated cone. In the shown embodiment, two opposite chipper knives are removed from the inner ring located closest to the top surface when reducing the feed rate, while all chipper knives in the outer ring spaced from the top surface are kept.
  • the invention is not restricted to this and could be varied in many ways within the scope of the claims.
  • half of the chipper knives could be removed also from the outer ring.
  • many different types of working tools are available on the market, for instance those with more than two rings of chipper knives or those with only one ring of chipper knives, which then usually have a greater length than those shown in this embodiment.
  • the basic principle of the invention is applicable to all these types of working tool and, as mentioned above, also to working tools that are not frustoconical but cylindrical.
  • FIG. 1 is a schematic top plan view of the procedure of block-forming and sawing of a round log.
  • the round log 1 is fed longitudinally first through a block-forming assembly which is generally designated 2 and which in the shown embodiment consists of two opposing frustoconical working tools or chipper discs 3, 3'.
  • a plurality of chipper knives 4 are arranged, which during rotation of the working tool and simultaneous longitudinal feeding of the round log cut the material to be removed from the round log into chips so that the round log is formed into a block with two flat lateral surfaces 5, 5'.
  • a sawing assembly is arranged, which is schematically shown in the Figure in the form of two circular saw blades 6. As is evident, the distance between the block forming assembly and the sawing assembly is so small that the front end of the block enters the sawing assembly before its rear end has left its block-forming assembly.
  • Figs 2 and 3 illustrate the more precise construction of a working tool 3.
  • the working tool has a frustoconical form with chipper knives 4 mounted on its circumferential surface.
  • the chipper knives are arranged in two separate circumferential rings with four chipper knives in each ring.
  • the chipper knives are symmetrical arranged, equidistantly spaced from each other along the circumference of the working tool as is best seen in Fig. 3.
  • each chipper knife has a processing cutting edge and is screwed into a recessed seat in the working tool.
  • through holes 7 are formed in the working tool through which the chips leave the block-forming assembly.
  • a saw blade 8 is arranged, which performs finishing of the lateral surfaces of the block. Moreover there is in the area between the saw blade 2 and the upper surface of the cone a feed limiter 9, whose outer circumferential edge forms a stepped cam curve with a height decreasing from one chipper knife to the next.
  • the feed limiter is shown and described in more detail in connection with Figs 7 and 8.
  • the size of the chips is dependent on the rotary speed of the working tools in relation to the feed rate of the log.
  • the feed rate of the logs must be reduced owing to limitations in capacity of the sawing assembly, and consequently then also the rotary speed of the working tool of the block-forming assembly must, as stated above, be reduced, with the ensuing problems.
  • Figs 4-6 illustrate a preferred embodiment of a method according to the present invention, which obviates the problems and drawbacks that are associated with the reduction of the feed rate of the logs when sawing thick logs.
  • two opposite chipper knives are removed from the working tool from the inner circumferential ring of chipper knives and are replaced with blind knives 10 which are screwed into the ordinary chipper knife seats 11.
  • the blind knives protect the chipper knife seats from wear and can be arbitrarily designed, provided that they can be mounted in the chipper knife seats and have no cutting edge or other protruding parts that can interfere with the feeding of logs.
  • the blind knives have the same mass as the ordinary chipper knives so as not to change the balancing of the working tool independently of how many chipper knives are removed and replaced with blind knives.
  • the blind knives could have such a form as to cover also the openings 7 of the working tool.
  • the feed limiter has a number of cam curves 12 along the outer periphery of the feed limiter. More specifically, the feed limiter has in Fig. 7 four cam curves while the feed limiter in Fig. 8 has only two cam curves. Each cam curve has a gradually decreasing radial distance between the axis of rotation and its outer peripheral edge from the area immediately behind a chipper knife to the area immediately in front of the next chipper knife.
  • the feed limiter depicted in Fig. 7 is intended for use in a working tool which has four cutting knives in the inner circumferential ring, i.e. one chipper knife in each recess along the periphery of the feed limiter as shown in the Figures. If, according to the invention, two of the chipper knives are then removed to be able to reduce the feed rate of the logs but keep a high rotary speed of the working tool, the feed limiter in Fig. 7 must be replaced with a feed limiter according to Fig. 8 which has two cam curves 12 and two recesses for the chipper knives along its periphery.
  • the radial distance between the centre of rotation and the periphery of the feed limiter is to decrease to the same extent from the front end to the rear end of each cam curve both in the embodiment according to Fig. 7 and in the embodiment according to Fig. 8.
  • the difference is that in Fig. 8 the change of the radial distance between the centre of rotation and the outer periphery of the feed limiter is to occur along about twice the distance in Fig. 7.
  • the function of the feed limiter will be most easily understood from Fig. 4. As is evident, the outer peripheral edge of the cam curve of the feed limiter abuts against the surface last cut by the chipper knives. As a result, the feed limiter will limit the maximum feeding of the log to be processed by the feeding being limited to the reduction of the radial distance between the centre of rotation and the outer peripheral surface of the cam curve that occurs from one chipper knife to the next chipper knife.
  • the feed rate of the logs can thus be reduced to half, without the rotary speed of the working tools needing to be reduced or the size of the chips being changed.
  • the number of chipper knives is maintained in the outer circumferential ring but this is not very important since, as illustrated in Fig. 4, it is usually only the inner circumferential ring of chipper knives that processes the round log while the outer circumferential ring of chipper knives will process the logs only in case of unusually large dimensions, such as in connection with root swellings and the like. The amount of chips that is cut by the outer circumferential ring of chipper knives and that will be smaller than the chips that is cut by the inner circumferential ring of chipper knives will thus be small.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (4)

  1. Procédé pour former une bille de bois ronde (1) dans un bloc avec deux ou plusieurs surfaces latérales plates (5, 5') comprenant les étapes consistant à couper directement en copeaux le matériau qui doit être retiré, au moyen d'un ensemble de formation de bloc (2) du type ayant deux ou plusieurs outils de travail (3, 3') qui ont chacun la forme d'un tambour rotatif ou d'un corps tronconique qui, sur sa surface circonférentielle, supporte une pluralité de couteaux de déchiquetage (4) ; après l'ensemble de formation de bloc, alimenter le bloc à un ensemble de sciage (6) pour rescier le bloc afin de produire des planches et des plateaux, et lors du sciage des billes de bois épaisses, réduire la vitesse d'alimentation de l'ensemble de sciage et, ainsi également de l'ensemble de formation de bloc, caractérisé par l'étape supplémentaire consistant à retirer, lors du traitement des billes de bois épaisses, un ou plusieurs couteaux de déchiquetage (4) de chacun des outils de travail (3, 3') tout en prenant en considération une répartition symétrique des couteaux de déchiquetage restants, en vue d'obtenir des copeaux uniformes, afin de compenser la vitesse d'alimentation réduite, et ainsi d'empêcher ou au moins de limiter la réduction de la vitesse de rotation des outils de travail qui est sinon nécessaire pour maintenir la taille de copeau souhaitée.
  2. Procédé selon la revendication 1, caractérisé par l'étape consistant à remplacer, conjointement au retrait des couteaux de déchiquetage (4), un limiteur d'alimentation (9), qui a des courbes de came (12) agencées sur une surface de bord externe avec un limiteur d'alimentation avec le même nombre de courbes de came que le nombre de couteaux de déchiquetage restants dans un anneau circonférentiel adjacent au limiteur d'alimentation.
  3. Procédé selon la revendication 1 ou 2, caractérisé par l'étape consistant à retirer, dans un outil de travail (3, 3') de forme tronconique ayant des couteaux de déchiquetage (4) qui sont agencés sur deux ou plusieurs anneaux circonférentiels autour de la surface circonférentielle, les couteaux de déchiquetage ne provenant pas de tous les anneaux circonférentiels mais au moins de l'anneau circonférentiel interne le plus près de la partie supérieure tronconique.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé par l'étape consistant à monter, dans les positions respectives des couteaux de déchiquetage (4) retirés, des couteaux aveugles (10) qui se montent dans les sièges (11) des couteaux de déchiquetage mais n'ont pas de bord de coupe de traitement.
EP02789121A 2001-11-28 2002-11-28 Procede de traitement plan d'une bille de bois ronde Expired - Fee Related EP1458531B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0103967A SE519769C2 (sv) 2001-11-28 2001-11-28 Förfarande vid planbearbetning av en rundstock samt blindkniv
SE0103967 2001-11-28
PCT/SE2002/002199 WO2003064126A1 (fr) 2001-11-28 2002-11-28 Procede de traitement plan d'une bille de bois ronde

Publications (2)

Publication Number Publication Date
EP1458531A1 EP1458531A1 (fr) 2004-09-22
EP1458531B1 true EP1458531B1 (fr) 2007-01-24

Family

ID=20286115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02789121A Expired - Fee Related EP1458531B1 (fr) 2001-11-28 2002-11-28 Procede de traitement plan d'une bille de bois ronde

Country Status (5)

Country Link
EP (1) EP1458531B1 (fr)
AT (1) ATE352403T1 (fr)
DE (1) DE60217913T2 (fr)
SE (1) SE519769C2 (fr)
WO (1) WO2003064126A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8225828B2 (en) * 2006-12-11 2012-07-24 Key Knife, Inc. Modular conical chipper/canter head and method
SE535557C2 (sv) * 2010-03-05 2012-09-25 Torbjoern Carlberg Förfarande för framställning av flis

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI55784C (fi) * 1976-07-30 1979-10-10 Eero Mikael Kivimaa Kutterhuvud
US4263949A (en) * 1977-11-24 1981-04-28 Kivimaa Eero Mikael Cutter head
US4266584A (en) * 1979-06-27 1981-05-12 Mainland Industries, Inc. Edger saw combining chipper with circular saw blade
US4456045A (en) * 1983-01-13 1984-06-26 Gregoire James L Dual rotation chipping head

Also Published As

Publication number Publication date
SE0103967L (sv) 2003-04-08
ATE352403T1 (de) 2007-02-15
EP1458531A1 (fr) 2004-09-22
SE519769C2 (sv) 2003-04-08
WO2003064126A1 (fr) 2003-08-07
DE60217913T2 (de) 2007-10-25
DE60217913D1 (de) 2007-03-15

Similar Documents

Publication Publication Date Title
US3780778A (en) Sawing and chipping machine
US4269244A (en) Rotary chipping head
US20100123034A1 (en) Chipper Knife and Method of Manufacturing a Chipper Knife
US4266584A (en) Edger saw combining chipper with circular saw blade
US20100163662A1 (en) Chipper Knife and Method of Manufacturing a Chipper Knife
US4697626A (en) Log chipping and flaking apparatus and method
EP1458531B1 (fr) Procede de traitement plan d'une bille de bois ronde
CA2713020C (fr) Butee de couteau tranchant
EP1513659B1 (fr) Lame de dechiqueteuse
US5782278A (en) Cant forming device
CA2520887C (fr) Couteau fixe de dechiqueteuse
US4263949A (en) Cutter head
CA2671239C (fr) Tete de dechiqueteuse/equarrisseuse conique modulaire et procede
FI111821B (fi) Kone pölkkyjen muodostamiseksi, joka käsittää spiraalilevyt sekä hakkuulaitteen spiraalilevyjä varten
EA000245B1 (ru) Ножевая пластина для деревообрабатывающего станка
US4131146A (en) Helical flaking head with multiple cutting circle diameters
US7210509B2 (en) Chipping head
EP1961536A1 (fr) Disque de déchiquetage, déchiqueteuse-equarrisseuse comportant un tel disque, et ensemble de couteaux pour un tel disque de déchiquetage
CA1142063A (fr) Scie d'equarrissage a lame circulaire et dechiqueteuse
JP3097476U (ja) 木工用丸鋸
SE519412C2 (sv) Sågklinga för träreduceringsanordningar

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040525

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FI FR

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BILLER, SVEN-OLOV

REF Corresponds to:

Ref document number: 60217913

Country of ref document: DE

Date of ref document: 20070315

Kind code of ref document: P

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20071025

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20071105

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20071106

Year of fee payment: 6

Ref country code: AT

Payment date: 20071105

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070914

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070124

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081128

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090603