EP1872918B1 - Sägen von Brettern aus Holz mit einer Kreissäge - Google Patents

Sägen von Brettern aus Holz mit einer Kreissäge Download PDF

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Publication number
EP1872918B1
EP1872918B1 EP06116385A EP06116385A EP1872918B1 EP 1872918 B1 EP1872918 B1 EP 1872918B1 EP 06116385 A EP06116385 A EP 06116385A EP 06116385 A EP06116385 A EP 06116385A EP 1872918 B1 EP1872918 B1 EP 1872918B1
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EP
European Patent Office
Prior art keywords
wood
saw
saw blade
sawing
thickness
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.)
Active
Application number
EP06116385A
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German (de)
English (en)
French (fr)
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EP1872918A1 (de
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.)
Nordpan Rubner Holzbauelemente GmbH
Original Assignee
Nordpan Rubner Holzbauelemente GmbH
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
Priority to EP06116385A priority Critical patent/EP1872918B1/de
Priority to ES06116385T priority patent/ES2316007T3/es
Priority to DE502006001343T priority patent/DE502006001343D1/de
Priority to SI200630118T priority patent/SI1872918T1/sl
Priority to DK06116385T priority patent/DK1872918T3/da
Application filed by Nordpan Rubner Holzbauelemente GmbH filed Critical Nordpan Rubner Holzbauelemente GmbH
Priority to AT06116385T priority patent/ATE404334T1/de
Priority to PL06116385T priority patent/PL1872918T3/pl
Publication of EP1872918A1 publication Critical patent/EP1872918A1/de
Application granted granted Critical
Publication of EP1872918B1 publication Critical patent/EP1872918B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/025—Details of saw blade body

Definitions

  • the present invention relates to a method and a saw unit for sawing slats of wood with a circular saw.
  • Circular saws are common means of sawing wood. In addition to the cutting to length and cutting of slabs into specific formats, it is also important to divide a log, beam or board into a plurality of thinner boards in the axial direction of the circular saw blade, which are referred to below as "slats".
  • the term "lamella” here basically refers to the wood formats resulting from the sawing process according to the invention. These need not necessarily be particularly thin, although preferred thicknesses of the fins will be discussed below. The term initially serves only to distinguish the sawed wood from the unseeded wood.
  • Starting material of the sawing process according to the invention may be boards, beams or whole logs or parent parts, with already pre-sawn boards or beams with a relatively large thickness are preferred.
  • the EP 0 211 423 A2 shows in cross-section conical circular saw blades with wedge effect.
  • the DE 20 2006 001047 U1 shows saw blade cross-section profiles adapted to profiles of profile cutters, which thicken towards the axis.
  • the EP 0 519 34.7 A1 shows wedge-shaped space-fixed separating element in connection with circular saw blades.
  • the technical problem underlying the invention is to provide a new method and a new sawing unit for sawing wooden lamellas with a circular saw, which offer improved practical performance over the prior art.
  • the basic idea of the invention is based on the use of a circular saw blade which exerts a wedge effect on the sawn wood and has a special shape for this purpose. Since the circular saw blade is rotationally symmetrical about the axis, this is the cross-sectional profile in the radial direction, in which therefore the axis is in the cutting plane, described. Here is in a region of the circular saw blade, which is "more central" than the saw teeth, a greater axial strength than the axial strength of the saw teeth before. The saw blade is therefore thicker in a central area than outside. This axially stronger region, when immersed in the slot cut by the saw teeth on the outer edge, exerts a force in the axial direction on the sawn wood and thus acts as a wedge.
  • the axial strength of the saw teeth In contrast, should not form the "thickest point" of the cross-sectional profile of the saw blade in the invention, the axial strength of the saw teeth.
  • the saw teeth can be axially stronger than the part of the saw blade which adjoins directly inside. Incidentally, the saw blade but in any case further inside stronger than the saw teeth.
  • the saw teeth themselves can be designed with a relatively low axial strength, which allows quite significant reductions in cutting losses. These low sawtooth strengths are not necessarily associated with stability problems due to the better stability of the further thickened saw blade.
  • the inner region of the saw blade is also assigned the function of providing the necessary stability of the overall saw blade.
  • the area of the plant between the sawn wood sides and the region of the saw blade, which exerts the mentioned wedge effect applied to a liquid lubricant and coolant.
  • a liquid lubricant and coolant This can be initiated during the sawing process by a hose or the like. Or be sprayed.
  • this is a water-based lubricant that does not interfere with the subsequent drying process, does not affect the sawn lamellae in their quality, low cost and no Raises environmental issues.
  • Has proven particularly useful here a solution of soaps, especially soft soap, in water.
  • a continuous, ie without step-like jumps decrease in the thickness of the saw blade from the thicker region radially outward.
  • the saw teeth themselves can be somewhat stronger than the immediately adjacent saw blade area, so that here too a discontinuous and stepwise increase or decrease in the thickness is permitted.
  • this refers only to the transition to the saw teeth themselves and, as it were, to the "shadow" of the saw teeth in the radial direction, that is to discontinuous jumps that do not exceed the thickness of the saw teeth in radial projection.
  • the decrease in strength runs monotonically radially from the thicker region to the outside, that is, there is no longer an increase in strength.
  • it is even strictly monotone, so it is a continuous uninterrupted strength reduction in the direction radially outward.
  • this again applies except for the transition to the saw teeth and not necessarily for the areas radially within the strongest area of the saw blade.
  • the radial center of the saw blade is actually also the region of greatest axial strength which, as the embodiment shows, can also continue to the outside by a considerable proportion of the total radius.
  • a second preferred variant provides for a "one-sided" increase in strength, that is, the wedge effect is present only on one side and the other side is preferably flat, so that not touched or insignificantly touched by the saw cut wood side. This results in an asymmetric wedge effect.
  • the symmetrical saw blades are used when a central section produces two lamellae, which are bent away on both sides by the wedge effect.
  • the starch gain necessary for reasons of stability and the tension generated by the wedge effect in the wood can be distributed on both sides.
  • the asymmetrical "one-sided" variant is preferably used when two saw blades are provided on a common drive axle and lie outward with the side designed in each case as a wedge. Then a core area between the saw blades is left by the parallel and common cuts of the two saw blades, which could not evade at a wedge effect occurring here because of the pairing of the saw blades. The respective outer areas can be pushed away laterally.
  • a total of four fins are then produced, the first two each outside the coaxial saw blades and the second two separated within the coaxial saw blades and by the symmetrical subsequent saw blade.
  • more "serial stages" than one with two coaxial saw blades are possible, in which case two outer blades are separated per saw blade pair, which are separated from one of the two serially upstream saw blades left between these core area.
  • a symmetrical central blade or not are possible.
  • two saw blades can be used for a single sipe cut, which are therefore in a common plane, so are coplanar. These saw blades overlap slightly in the transport direction of the wood, which is why one of them lies slightly in the transport direction in front of the other, so that there is no contact of the saw teeth. This ensures that the individual saw blade does not have to correspond to the entire depth of cut and thus only has to dive into the wood by more than half the depth of cut.
  • the depth of cut is thus divided into two coplanar opposite saw blades, as the embodiment illustrated in more detail. This also applies in particular to individual "sawing stations" in a "serial connection" according to the above explanations.
  • the saw blade or the saw blades ie the circular saw or saw unit, a planer unit upstream.
  • This plans plane at least one side surface which is perpendicular to the axial direction of the saw blades, and thus creates a defined plane for the incidentein sued the subsequent saw cuts.
  • an important preferred feature of the invention is that undried wood or wood with a high residual moisture content can be cut or cut.
  • essentially unsaved and undried fresh wood can be sawed into lamellae, which can be dried with much less time due to the much larger specific surface area.
  • the use of fresh wood ensures that dimensional errors due to warping of the wood during a drying process prior to the sawing are avoided.
  • the lower distortion also manifests itself in the fact that in the above-mentioned production of a flat reference surface by planing less waste occurs because the present (rough) sawing surface is less uneven.
  • the undried wood has in connection with the invention also has the advantage that it presses slightly better by the mentioned wedge effect leaves because it reacts more elastic than already dried wood.
  • the term "undried wood” is intended to refer in particular to wood having a residual moisture content of at least 15%, preferably at least 20% and particularly preferably at least 30%.
  • lamellae has already been introduced as a general term for the products of the process according to the invention.
  • this refers to boards having a thickness of at most 15 mm, preferably at most 13 mm and particularly preferably at most 11 mm in the axial direction of the saw blade, which applies to hardwood and softwood.
  • Softwood is of special interest.
  • the resulting lamellae can be used according to the invention for multi-layer building boards, such as so-called.
  • Solid wood panels which are glued together from a plurality of layers of corresponding fins, but also for core areas, the top or bottom of other multi-layer building boards or a floor covering, as a wear layer same.
  • Especially with more expensive types of wood is the fact that according to the invention by the lower axial strengths of the saw teeth less saw cut and for the already described reasons also lower planing losses occur, of particular interest.
  • FIG. 1 shows a sectional view through an inventive asymmetrical circular saw blade.
  • the cut is such that the saw blade radius and the axis of rotation lie horizontally or vertically in the plane of the drawing.
  • the left-hand illustration is the right half of a section through the radial center from a first saw blade and the right-hand representation is mirror image of it from the radial center of the left half of a section through a second saw blade. Both blades are summarily denoted by 1.
  • the right edge of the left saw blade 1 is at the bottom of the FIG. 1 shown enlarged.
  • FIG. 3 a corresponding saw cut by a board 2, which produces two blades 2a and 2b.
  • FIG. 1 So shows a sectional view containing both saw blade axes, wherein the actual transport direction of the board is rotated about the vertical in the plane of the vertical line on the plane until an actual overlap of the saw blade edges in the projection results.
  • the individual saw blades 1 have an outer row of teeth 3 with an axial thickness of 1.6 mm. Radial within this row of teeth 3, the axial strength jumps back to 1 mm, the much larger part of the return, as the detail in FIG. 1 left below, on the top and the smaller part on the bottom is done. Incidentally, the underside of the saw blade is completely flat, whereas the upper side remains straight and thus at the thickness of 1 mm only for a radial region between the outermost radius of 175 mm and an inner radius of 159 mm in the cross-sectional profile.
  • the thickness jumps to 1.2 mm thickness with a production-related small step of 0.2 mm and from there rises linearly, ie at a constant angle, to a final axial thickness of 5 mm, which is achieved at a radius of 90 mm. This results in a very acute angle of rise of about 3 °.
  • angles in the range of 1 to 5 °, preferably 2 to 5 ° and particularly preferably 2.5 to 4 ° are advantageous.
  • FIG. 2 shows one FIG. 1 corresponding representation of a symmetrical circular saw blade according to the invention.
  • the dimensions are completely analogous with the only difference that the ramp-like rise in this case is distributed symmetrically on both sides of the saw blade, so in each case only half the angle occurs, so that the sum of the two angles is to be set for the mentioned preferred angle ranges here.
  • FIG. 3 shows a section through a board of width 155 mm and any length (perpendicular to the plane) and a thickness of about 15 mm. This is characterized by a cut with the two saw blades 1 according to the invention FIG. 1 or off FIG. 2 a set of two slats 2a and 2b of the respective thickness of 6.7 mm (at a cutting width of 1.6 mm) emerged. Instead, with a conventional circular saw blade, the saw cut loss would be 2.5 or 2.9 mm, for example, depending on the lamella thickness, it would be considerably higher on the total wood thickness.
  • Preferred lamella geometries are in the range of 4 to 10, preferably 5 to 9 mm thick and about 100 to 200 mm wide, and such lamellae may be cut from boards of, for example, 50 mm thick or more. It is readily apparent that either by using thinner starting boards or by producing one or even more than one additional blade of the same starting power, direct economic benefits can be derived from the reduced saw blade losses.
  • the saw blade according to the invention has an outstanding because of the substantially continuous increase in its thickness to 5 mm Stability and pressed by the axial wedge effect the resulting slats slightly apart.
  • FIG. 4 shows a perspective view of a complete sawing unit according to the invention.
  • the timber transport direction runs from right (behind) to left (front).
  • a planing unit not shown, for planing a defined lower reference surface of the board 2, which then rests on the transport plane of the saw unit.
  • the top surface of the board is planed so far "clean" that it is glued and the total thickness of the board, taking into account the saw cuts losses the desired multiple of the desired lamella thickness.
  • the very low distortion of the fresh wood compared to the prior art significantly lower planing losses realized.
  • the saw unit in this example comprises six individual circular saws 4a to 4f, each with vertical drive axles.
  • the drive axes of the circular saws 4b, 4d, 4f are denoted by 5b, 5d, 5f, the remaining drive axles are concealed by cover hoods, which are folded up in the circular saws 4b, 4d, 4f.
  • the axes are driven by electric motors 6, of which the motors 6b, 6d, 6f associated with the circular saws 4b, 4d, 4f are shown together with a respective drive toothed belt connected at the top.
  • the circular saws are each displaced transversely to the transport direction of the wood and adjustable.
  • Corresponding guides are recognizable for the circular saws 4b, 4d, 4f and denoted by 7b, 7d, 7f.
  • the corresponding actuators can be found below and are not specified.
  • cooling fluid lines which direct an aqueous solution of greasy soap to the respective circular saw blades and run into the cutting area.
  • FIG. 4 shown between the circular saws and in the transport direction of the circular saws 4a and 4b respectively guides 8, which are in the transport direction Seen substantially represent a rotated by 90 ° and with the legs pointing inward U-profile and thus can prevent breaking away from the wedge effect pushed away slats up and down.
  • the asymmetrical saw blades 1 according to FIG. 1 particularly suitable for circular saws 4, each with two coaxial saw blades.
  • the sloping planes in FIG. 1 are directed to the top, each lie outside, so at the top of each saw blade above and at the bottom saw blade below.
  • All circular saws 4a to 4f in FIG. 4 are constructed accordingly. It is therefore a total of twelve saw blades 1.
  • the circular saws rotate within a pair (ie, 4a and 4b, 4c and 4d and 4e and 4f) respectively in opposite directions, with the inner regions against the transport direction of the wood, as already the arrows in FIG. 1 hint at the axles.
  • Circular saws 4 and saw blades 1 within each pair are, as also already explained, opposite and arranged slightly offset in the transport direction, so that there is an overlap.
  • the two upper saw blades 1 of the circular saws 4e and 4f thus separate in a final common cut a blade from above, while the two lower saw blades cut off a blade down.
  • the remaining core area between the respective saw blades is supplied to the next pair of circular saws 4c and 4d, which in turn, with a smaller axial distance of the saw blades, each separates a blade up and down.
  • the remaining core is reduced by the saw pair 4a and 4b to a single blade remaining between the saw blades.
  • this remaining core could be replaced by a last pair of saws, each with only one symmetrical saw blade according to FIG. 2 be separated into two slats, so that a total of a straight number of slats arises.
  • the embodiment of FIG. 4 however, generates an odd number, namely seven slats.
  • the slats After passing through the last pair of circular saws 4a and 4b and the guides 8 behind them, the slats are gripped in total by a roller conveyor station and further transported from the saw unit to be stacked in a conventional manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Sawing (AREA)
  • Rod-Shaped Construction Members (AREA)
EP06116385A 2006-06-30 2006-06-30 Sägen von Brettern aus Holz mit einer Kreissäge Active EP1872918B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES06116385T ES2316007T3 (es) 2006-06-30 2006-06-30 Aserrado de tablas de madera con una sierra circular.
DE502006001343T DE502006001343D1 (de) 2006-06-30 2006-06-30 Sägen von Brettern aus Holz mit einer Kreissäge
SI200630118T SI1872918T1 (sl) 2006-06-30 2006-06-30 Žaganje lesenih desk s krožno žago
DK06116385T DK1872918T3 (da) 2006-06-30 2006-06-30 Savning af brædder af træ med en rundsav
EP06116385A EP1872918B1 (de) 2006-06-30 2006-06-30 Sägen von Brettern aus Holz mit einer Kreissäge
AT06116385T ATE404334T1 (de) 2006-06-30 2006-06-30 Sägen von brettern aus holz mit einer kreissäge
PL06116385T PL1872918T3 (pl) 2006-06-30 2006-06-30 Cięcie desek z drewna za pomocą piły tarczowej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06116385A EP1872918B1 (de) 2006-06-30 2006-06-30 Sägen von Brettern aus Holz mit einer Kreissäge

Publications (2)

Publication Number Publication Date
EP1872918A1 EP1872918A1 (de) 2008-01-02
EP1872918B1 true EP1872918B1 (de) 2008-08-13

Family

ID=37478620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06116385A Active EP1872918B1 (de) 2006-06-30 2006-06-30 Sägen von Brettern aus Holz mit einer Kreissäge

Country Status (7)

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EP (1) EP1872918B1 (pl)
AT (1) ATE404334T1 (pl)
DE (1) DE502006001343D1 (pl)
DK (1) DK1872918T3 (pl)
ES (1) ES2316007T3 (pl)
PL (1) PL1872918T3 (pl)
SI (1) SI1872918T1 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2710719C1 (ru) * 2019-01-29 2020-01-10 Артём Владимирович Власов Круглая пила

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013201291A1 (de) * 2013-01-28 2014-07-31 Albert Knebel Gmbh & Co. Kg Holding Sägeblatt mit integriertem Spanraum
DE102014105352A1 (de) * 2014-04-15 2015-10-15 Tpv Gmbh Vorrichtung und Verfahren zum Schneiden eines gefrorenen, strangförmigen Lebensmittels in Scheiben
CN112829009A (zh) * 2020-12-31 2021-05-25 浙江晶通塑胶有限公司 有效回收地板的软木废料的生产方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3676754D1 (de) * 1985-08-09 1991-02-14 Berthold Fries Scheibenfoermiges, rotierendes werkzeug.
DE4121021A1 (de) * 1991-06-18 1992-12-24 Wurster & Dietz Maschf Verfahren und vorrichtung zum trennen oder schlitzen eines starren schnittguts
DE202006001047U1 (de) * 2006-01-23 2006-05-11 Taflo, Roland Werkzeugsatz zum Profilieren und Trennen von Schnittholz

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2710719C1 (ru) * 2019-01-29 2020-01-10 Артём Владимирович Власов Круглая пила

Also Published As

Publication number Publication date
PL1872918T3 (pl) 2009-05-29
ATE404334T1 (de) 2008-08-15
DK1872918T3 (da) 2008-12-15
DE502006001343D1 (de) 2008-09-25
ES2316007T3 (es) 2009-04-01
EP1872918A1 (de) 2008-01-02
SI1872918T1 (sl) 2009-06-30

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