EP0052670A1 - Procédé et dispositif pour la fabrication de copeaux plats - Google Patents

Procédé et dispositif pour la fabrication de copeaux plats Download PDF

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Publication number
EP0052670A1
EP0052670A1 EP80107400A EP80107400A EP0052670A1 EP 0052670 A1 EP0052670 A1 EP 0052670A1 EP 80107400 A EP80107400 A EP 80107400A EP 80107400 A EP80107400 A EP 80107400A EP 0052670 A1 EP0052670 A1 EP 0052670A1
Authority
EP
European Patent Office
Prior art keywords
chip
wood
knife
fiber
knives
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.)
Withdrawn
Application number
EP80107400A
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Köstermeier
Wilhelm Pallmann
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.)
KOSTERMEIER KARL HEINZ
Original Assignee
KOSTERMEIER KARL HEINZ
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 KOSTERMEIER KARL HEINZ filed Critical KOSTERMEIER KARL HEINZ
Priority to EP80107400A priority Critical patent/EP0052670A1/fr
Publication of EP0052670A1 publication Critical patent/EP0052670A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B27L11/005—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G13/00—Cutter blocks; Other rotary cutting tools
    • B27G13/02—Cutter blocks; Other rotary cutting tools in the shape of long arbors, i.e. cylinder cutting blocks
    • B27G13/04—Securing the cutters by mechanical clamping means

Definitions

  • the invention relates to a method for producing flat wood chips from round, log or industrial waste wood using a rotating cutting body provided with strip knives and to an apparatus for performing this method.
  • Such methods and devices are widely known.
  • a knife shaft for producing flat wood chips is known, which is provided with a double comb knife.
  • a knife shaft for wood-cutting machines is known, which is provided with so-called comb knives.
  • DE-PS 16 53 090 a wood cutting machine is known which with strip knives cutting on gaps, i.e. so-called profile knives is provided, while a knife shaft with a double-comb knife is known from DE-OS 27 21 930.
  • Strip knives with integrated scribing tips or with separate scribing tips for wood cutting are also known.
  • chip removal and chip removal are common to all these known devices for wood cutting.
  • special shapes of the knives or separate cutters are therefore necessary, with corresponding wood supports being provided in the separating cut which is produced by the shape of the knives or by separate cutters transverse to the grain of the wood.
  • the invention solves the problem of creating a method and an apparatus for performing this method, with which on be; in a particularly simple manner, a high, uniform chip quality is achieved with a low proportion of fine material and the chips can be divided into both the longitudinal and the transverse fiber directions.
  • the advantages achieved by the invention are essentially to be seen in the fact that the splitting of a chip in the longitudinal and transverse directions of the fibers is made possible, a normal straight strip knife without protruding serrated noses being used for the peeling process of the chip and the size and type of the conventional recess within the knife shaft for the reception of knives, knife holders and centrifugal wedge remains unchanged. Furthermore, the chip length in the cross fiber direction can be easily adjusted.
  • Chip cutters 3 are used within a knife holder 2 and are assigned to one another at a distance of the desired fiber length of the chips.
  • the width 9 of the chip separator 3 depends on the chip thickness and the type of wood. However, both parameters vary with one another, the preferred width of the chip separator being in the range from approximately 3 to 6 mm.
  • the position of the chip separator 3 in relation to the flight circle of the knife edge 4 is defined by the distance 13, which results from the chip thickness plus the wear portion of the knife edge 4 within a knife service life.
  • the chip separator 3 advantageously stands behind this knife edge 4 by this distance and thus lies flush against the knife shaft jacket 5.
  • the wear on the chip breaker that occurs within a service life does not impair the function, since there is also sufficient functional reliability if the distance between the knife shaft jacket 5 and the chip breaker 3 is at least 3 mm.
  • the chip separator is functional as long as there is a full contact between the chip separator and the chip discharge side of the knife 6.
  • the separating function of the chip separator 3 is supported by profiles on the side of the chip separator 3 facing the wood, as shown in FIGS. 3, 4 and 5.
  • FIG. Width and full contact on the chip discharge side of the knife is important for the functionality of the chip separator. With this arrangement it is easily possible to separate the chip transversely to the fiber direction.
  • the size of the angle ⁇ to the cutting edge of the knife which is decisive for the length of the chip perpendicular to the fiber direction, is selected as a function of the bevel cutting angle ⁇ .
  • a separation of the chip in the transverse direction of the fiber is made possible in that the chip exits at the same angle to the cutting edge of the knife as the wood has previously hit the knife.
  • the right side of the chip leads the amount of the edge to the angle ß of the oblique position of the knife in relation to the left side of the chip.
  • the chip With increasing chip length, the chip is deflected within the chip pocket along the chip path 8 by the chip separator 3.
  • a shifting force occurs in the direction of arrow 7, the counterforce of which is given by the strength of the wood or the binding of the fibers to one another.
  • the displacement force represented by the arrow 7 becomes greater than the binding of the fibers of the chip to one another, so that the chip breaks open in the direction of the fiber.
  • the displacement force or the increase in the displacement force increases in connection with the chip length, the magnitude of the displacement force can be reduced to zero by changing the angle ⁇ .
  • the result of this arrangement is a chip, the length of which in the transverse direction of the fiber is equal to the maximum possible cutting length in the wood to be cut.
  • an angle ⁇ must be selected which is less than 90 °.
  • the size of this angle is determined by the minimum chip length in the fiber longitudinal direction 11 and the minimum dimension of the required chip pocket, the width of which is designated by 10 in the direction of travel of the chip, for the trouble-free drainage of the cut chip. Particularly fine chips are achieved if the angle ⁇ does not fall below the range of 30 °. 13 in FIG. 1 also indicates the chip thickness plus the expected wear of the knife. Furthermore, the arrow in FIG. 2 denotes 12, which indicates the running direction of the knife shaft 1.
  • the chip separator 3 Due to the position of the chip separator 3, there are new possibilities with regard to wear due to the chip separation in the transverse direction of the fibers. Since the chip breaker does not protrude from the knife circle, hard metals and oxide ceramics can be used. The chip breaker itself can be held in the knife holder 2 releasably or non-releasably. Even an adjustment in the direction of the knife edge 4 for possible wear on the Compensating the side of the chip breaker facing the wood is possible with the conventional means.
  • the centrifugal wedge belonging to the knife holder 2 with chip separator 3 has wooden supports, the size and position of which depend on the size and position of the chip separator. However, it is also entirely possible to dispense with a knife holder entirely and to arrange the chip separators in the centrifugal wedge itself.
  • the invention thus achieves particularly good and uniform chip thicknesses, since protruding cutting elements which protrude beyond the flight circle of the knives are dispensed with and the wood is not unnecessarily set in motion. Even thin woods can be machined with excellent chip quality. In addition, the proportion of fines is particularly low due to the lack of separating cuts; the use of strip knives in the simplest version reduces the knife costs per machine. Another advantage is that when the parts according to the invention are installed in conventional knife shafts, they do not have to be changed.

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)
EP80107400A 1980-11-26 1980-11-26 Procédé et dispositif pour la fabrication de copeaux plats Withdrawn EP0052670A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP80107400A EP0052670A1 (fr) 1980-11-26 1980-11-26 Procédé et dispositif pour la fabrication de copeaux plats

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80107400A EP0052670A1 (fr) 1980-11-26 1980-11-26 Procédé et dispositif pour la fabrication de copeaux plats

Publications (1)

Publication Number Publication Date
EP0052670A1 true EP0052670A1 (fr) 1982-06-02

Family

ID=8186908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107400A Withdrawn EP0052670A1 (fr) 1980-11-26 1980-11-26 Procédé et dispositif pour la fabrication de copeaux plats

Country Status (1)

Country Link
EP (1) EP0052670A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514422A4 (de) * 2013-11-05 2015-01-15 Böhler Profil Gmbh Verfahren zur Herstellung von Schneidmessern

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648231A1 (de) * 1972-03-24 1978-01-19 Ver Edelstahlwerke Ag Messeranordnung fuer holzzerspanungsmaschinen
DE2721930B2 (de) * 1977-05-14 1980-07-10 Hombak Maschinenfabrik Gmbh & Co Kg, 6550 Bad Kreuznach Messerwelle zur Erzeugung flächiger Holzspäne

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648231A1 (de) * 1972-03-24 1978-01-19 Ver Edelstahlwerke Ag Messeranordnung fuer holzzerspanungsmaschinen
DE2721930B2 (de) * 1977-05-14 1980-07-10 Hombak Maschinenfabrik Gmbh & Co Kg, 6550 Bad Kreuznach Messerwelle zur Erzeugung flächiger Holzspäne

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT514422A4 (de) * 2013-11-05 2015-01-15 Böhler Profil Gmbh Verfahren zur Herstellung von Schneidmessern
AT514422B1 (de) * 2013-11-05 2015-01-15 Böhler Profil Gmbh Verfahren zur Herstellung von Schneidmessern
US10532486B2 (en) 2013-11-05 2020-01-14 Boehler Profil Gmbh Method for producing cutting blades

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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: 19811002

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT SE

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840221

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PALLMANN, WILHELM

Inventor name: KOESTERMEIER, KARL-HEINZ