EP1341633A1 - Outil de sciage pour une scie circulaire mecanique portative presentant deux lames de scie coaxiales, pouvant fonctionner en sens oppose et tournant directement l'une a cote de l'autre - Google Patents

Outil de sciage pour une scie circulaire mecanique portative presentant deux lames de scie coaxiales, pouvant fonctionner en sens oppose et tournant directement l'une a cote de l'autre

Info

Publication number
EP1341633A1
EP1341633A1 EP01974049A EP01974049A EP1341633A1 EP 1341633 A1 EP1341633 A1 EP 1341633A1 EP 01974049 A EP01974049 A EP 01974049A EP 01974049 A EP01974049 A EP 01974049A EP 1341633 A1 EP1341633 A1 EP 1341633A1
Authority
EP
European Patent Office
Prior art keywords
saw
teeth
saw blade
main
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.)
Withdrawn
Application number
EP01974049A
Other languages
German (de)
English (en)
Inventor
Albrecht Hofmann
Harald Krondorfer
Thomas Schomisch
Juergen Graef
Helmut Hammer
Andreas Kisselbach
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1341633A1 publication Critical patent/EP1341633A1/fr
Withdrawn legal-status Critical Current

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
    • B27B33/20—Edge trimming saw blades or tools combined with means to disintegrate waste
    • 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
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades
    • B23D45/165—Hand-held sawing devices with circular saw blades with a plurality of saw blades or saw blades having plural cutting zones
    • 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
    • B23D61/021—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9319—Toothed blade or tooth therefor
    • Y10T83/9324—With additional cutting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9374—With spacer interposed between shaft-mounted tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9372—Rotatable type
    • Y10T83/9377—Mounting of tool about rod-type shaft
    • Y10T83/9379—At end of shaft

Definitions

  • the invention relates to a sawing tool for a
  • Hand-held circular saw with two coaxial saw blades rotating past each other which can be driven in opposite directions, of the type defined in the preamble of claim 1.
  • Such sawing tools have the advantage that when working with the hand-held circular saw machine, the reaction forces and moments are eliminated by the counter-rotation of the two saw blades, and the machine is easy to operate and easy for the user to operate.
  • cutting edge wear progresses, for example when the cutting corners with which the two saw blades run past one another round, the saw blades no longer lie close together and the material between the two saw blades is no longer completely removed, so that a material web remains in the saw cut.
  • the main cutting edges of the saw teeth are inclined so that the corner edges of the main cutting edges, which are further forward in the direction of rotation of the saw blades, lie on those blade sides of the saw blades which face each other directly , This creates an axially directed force component during the sawing process due to the cutting force of the main cutting edges, which axially compresses the toothing areas of the saw blades in the cutting area, so that the saw blades are still close to one another even with increasing cutting edge wear.
  • the sawing tool according to the invention has the advantage that the machining of the material is distributed over two cutters which overlap in the cut.
  • the saw blades therefore no longer have to be held together in a targeted manner, but may also cover the main and secondary cutters with one non-canceling axial distance between the main cutters. Material that penetrates between them is machined by the re-cutter.
  • the degree of wear of the two main cutters does not have a major influence on the remaining of a material web in the cut, which is then machined by the post cutter. Since the divergence of the saw blades is no longer a problem due to the existing re-cutter, the saw blades do not have to be held together excessively in the cut in the sawing tool according to the invention, so that less frictional losses occur and the saw blade temperature remains low.
  • the power cutter has a plurality of cutting edges which are radially set back from the main cutting edges of the main cutting teeth and have an axial width which is greater than the axial spacing of the main cutting teeth on the two saw blades.
  • the radially recessed cutting edges of the secondary cutter are formed by the secondary cutting edges of the main cutting teeth of the one saw blade which face the other saw blade and which are so inclined relative to the plane of the blade that ' their at the outer edge adjacent the main cutting edge withdraws behind the plane of the saw blade and its inner edge, which faces away from it, protrudes beyond the plane of the saw blade, while the secondary cutting edges of the other saw blade, which face the cutter, have a parallel oblique course.
  • the facing cutting edges of the two saw blades run past each other almost without a gap. If this occurs, for example due to wear on the cutting edges or a tolerance-related gap between the saw blades, during the sawing process
  • the re-cutter has a plurality of re-cutter teeth, which are arranged one behind the other on a circular path concentric to the saw blade axis and each carry a cutting edge.
  • the trimmer teeth are arranged laterally on one saw blade above the plane of the blade and plunge into one in the other Saw blade formed directly under its serration. In this embodiment, it is prevented that the sharp cutting corners of the main cutting edges of the two saw blades collide during the sawing process under axial pressure on the saw blades or due to poor axial runout of the two saw blades and lead to destruction. Rather, when lateral forces occur, the side surfaces of the trimmer teeth run against the base of the blade recess without being damaged and thereby limit the convergence of the saw blades.
  • the blade recess is designed as an annular groove which is concentric with the saw blade axis and which is provided with a sliding coating.
  • the secondary cutter teeth are arranged within the teeth of the main cutter between the main cutter teeth and have a lower tooth height than the main cutter teeth. Since the secondary teeth only perform a small part of the machining work, fewer secondary teeth are advantageously provided than main teeth, so that e.g. a Nachschheider tooth only follows on every second or third main cutter tooth.
  • the secondary teeth are made of less hard and therefore cheaper material than the secondary machining work to be performed by the secondary teeth the main cutter teeth and can, for example, be set out of the saw blade.
  • the set post-cutter teeth are then ground in the cutting area.
  • the main cutter teeth of the saw blade carrying the secondary cutter teeth are made narrower in the axial direction than the main cutter teeth of the other saw blade.
  • At least one coaxial friction ring is arranged between the saw blades, the axial strength of which is dimensioned somewhat larger than the overlap dimension of the re-cutting teeth over the saw blade plane. This friction ring reduces the friction of the opposing saw blades when the blades are pressed together
  • the at least one friction ring can run loosely between the saw blades, preferably being guided on the lower edge of the trimmer teeth or on the drive spindle of the saw blade, or the friction ring is fastened to one of the saw blades, for example by spot welding , Riveting, gluing etc.
  • the surface becomes advantageous of the at least one friction ring optimized for sliding by choice of material or a suitable coating.
  • the post-cutter teeth of the post-cutter are arranged on a separate ring-shaped or disk-shaped carrier which is connected to one of the saw blades in a rotationally fixed manner.
  • the carrier is provided on its free carrier side or the blade side of the other saw blade facing this carrier side with a friction-reducing coating.
  • the secondary teeth are machined from the material of the carrier, for which then e.g. HSS or tool steel is used, or as separate, soldered teeth made of another material, e.g. Carbide, executed.
  • means for example channels, are provided in the saw blade to which the carrier is fastened with the trimmer teeth, via which the material chips generated by the trimmer teeth are derived.
  • 1 is a plan view of a sawing tool with two circular saw blades rotating in opposite directions
  • Fig. 2 shows a section along the line
  • Fig. 3 is an enlarged view of the detail
  • FIG. 4 shows a longitudinal section of a sawing tool according to a second exemplary embodiment
  • FIG. 5 shows a detail of a perspective view of the sawing tool in FIG. 4,
  • FIG. 6 shows a section of a longitudinal section of a sawing tool according to a third embodiment.
  • FIG. 7 is a perspective view of two friction rings present in the sawing tool according to FIG. 6, 8 shows a detail of a longitudinal section of a sawing tool according to a fourth exemplary embodiment
  • Fig. 9 is a partial plan view of a
  • FIG. 10 shows a detail of a plan view of the saw blade of the sawing tool which is covered in FIG. 9,
  • Fig. 12 is an enlarged view of the detail
  • sawing tools for a hand-held circular sawing machine shown in the drawing in various views and sections all have two coaxial circular saw blades, which are driven in opposite directions and can be driven in opposite directions, hereinafter referred to as saw blades 11, 12, which, after being clamped into the tool holder, do not show one here
  • Each saw blade 11, 12 has an external toothing 13, 14, hereinafter referred to as the main cutter, of a plurality of main cutter teeth 15, 16.
  • Each main cutter tooth 15, 16 has a main cutting edge 151 or 161, an outer minor cutting edge 152 or 162 and an inner minor cutting edge 153 or 163, the inner minor cutting edges 153, 163 of the two saw blades 11, 12 facing each other (FIG. 3).
  • the toothing 13, 14 of the two saw blades 11, 12 are shown only in part, and the rest of each toothing 13, 14 is symbolized by its pitch circle 131 and 141, respectively.
  • a so-called secondary cutter 10 is arranged between the two saw blades 11, 12 and is connected in a rotationally fixed manner to one of the saw blades 11, 12 and has an axial overlap with the main cutting teeth 15, 16.
  • the secondary cutter 10 has a plurality of blades which are radially set back with respect to the main blades 151, 161 of the main cutter teeth 15, 16 and which have an axial width which is greater than the mutual axial spacing of the main cutter teeth 15, 16 on the two saw blades 11, 12.
  • the re-cutter 10 is used for machining a material web 171 (FIG. 3) which may remain during sawing between the saw blades 11, 12, and which occurs in the event of a large axial gap between the main cutter teeth 15, 16 as a result of wear of the main cutting edges 151, 161 and can result from axial tolerances.
  • the cutting edges of the secondary cutter 10 are formed by the inner secondary cutting edges 153 of the main cutting teeth 15 of the saw blade 11 facing the saw blade 12, which are so inclined to the plane of the saw blade that their at the main cutting edge 151 Adjacent, outer edge 153a withdraws behind the plane of the saw blade and its inner edge 153b facing away from it protrudes beyond the plane of the saw blade.
  • the inner secondary cutting edges 163 of the other saw blades 16 have a parallel slope.
  • Fig. 2 a longitudinal section of a mint saw is shown in sections.
  • the inner minor cutting edges 153 and 163 of the main cutter teeth 15, 16 rotate past one another almost without a gap.
  • the detail III is shown in Fig. 2 of the saw tool already wearing. Due to the wear, a material or material web 171 remains in the sawing cut made in the workpiece 17 during the sawing process, which web is now separated from the inner secondary cutting edges 153
  • Main cutter teeth 15 are machined in their function as secondary cutter 10. Any transverse forces that may arise on the trimmer 10 are absorbed by an inclination of the outer secondary cutting edges 152 of the saw blade 12 carrying the trimmer 10.
  • the helix angle is selected so that the cutting corner formed with the main cutting edge 151 slightly recedes behind the plane of the saw blade.
  • the helix angle of the outer minor cutting edges 152 is designated ⁇ in FIG. 2.
  • the secondary cutter 10 has a plurality of secondary cutter teeth 20, which are arranged one behind the other on a circular path concentric to the aligned saw blade axes 18, 19 and each carry a cutting edge 201.
  • the trimmer teeth 20 are laterally projecting on the saw blade 11 via the saw blade plane and are immersed in an annular groove 21 formed in the saw blade 12 directly below its toothing 14, concentrically with the saw blade axis 19.
  • the axial width of the secondary teeth 20, and thus their cutting edges 201 is greater than the maximum possible distance between the main cutter teeth 15 and 16 of the sawing tool during the sawing process.
  • the saw blade 11 is supported on the side surfaces 202 of the trimmer teeth 20 in the groove base of the annular groove 21, so that a
  • At least the groove base of the annular groove 21 is provided with a sliding coating.
  • the secondary cutter teeth 20 are arranged between the main cutter teeth 15, the saw blade 11 and have a lower tooth height than the main cutter teeth 15.
  • the toothings 13, 14 of the two saw blades 11, 12 take over almost all of the cutting work as main cutters, and the secondary cutter teeth 20, which are set back with their cutting edges 201, only cut one between the main cutter teeth, if necessary 15, 16 remaining web of material. Since the trimmer teeth 20 perform much less cutting work, fewer trimmer teeth 20 can be provided than the main cutter teeth 15. Instead of one secondary cutter tooth 20 arranged between two main cutter teeth 15, as shown in FIG. 5, a secondary cutter tooth 20 can only follow every second or third primary cutter tooth 15. For the same reason, the secondary cutter teeth 20 can also be made of less hard and therefore cheaper material than the main cutter teeth 15. Thus, like the exemplary embodiment according to FIG. 8, shows that the trimmer teeth 20 are worked out of the saw blade 15 by grinding and are ground in the cutting area and on the side surface 202 which dips into the annular groove 21.
  • the thickness of the saw blade 12 is reduced overall in the saw blade 12 under the circumferential toothing 14, so that there is a recess 22 enclosed by the toothed ring.
  • the re-cutting teeth 20 arranged on the saw blade 11 protrude beyond the plane of the blade.
  • the sawing tool according to FIGS. 6 and 7 the thickness of the saw blade 12 is reduced overall in the saw blade 12 under the circumferential toothing 14, so that there is a recess 22 enclosed by the toothed ring.
  • the re-cutting teeth 20 arranged on the saw blade 11 protrude beyond the plane of the blade.
  • an axial force acting on the sawing tool during the sawing process is not achieved by the support of the side surfaces 202 of the trimmer teeth 20 on the saw blade 12, but by two friction rings 23, 24, which are located between the two saw blades 11, 12 are arranged and have an axial thickness which is slightly greater than the overlap dimension of the trimmer teeth 20 over the plane of the blade of the saw blade 11.
  • Both friction rings 23, 24 lie loosely between the saw blades 11, 12, the outer friction ring 23 on the lower edge of the trimmer teeth 20 and the inner friction ring 24 on one of the saw blades 11, 12 receiving drive spindles (not shown here).
  • the two friction rings 23, 24 can also on the
  • Saw blade 11 or the saw blade 12 may be fixed, for example by spot welding, riveting, gluing, etc.
  • the surfaces of the two friction rings 23, 24 are optimized for sliding to minimize friction by choice of material or by a suitable coating.
  • the main cutter teeth 15 of the saw blade 11 carrying the secondary cutter teeth 20 are made narrower in the axial direction than the main cutter teeth 16 on the saw blade 15.
  • the main cutter teeth 15 remain dimensioned accordingly Sawing the required torque on both saw blades 11, 12 is approximately the same size and does not get out of balance due to the use: the trimmer teeth 20.
  • the advantageous, almost reactive force-free sawing with the circular saw is obtained.
  • the secondary cutter 10 is designed as a separate component and is connected to the saw blade 11 in a rotationally fixed manner.
  • the Nachschneider teeth 20 are in the circumference of one
  • Embodiment of annular carrier 25 which can alternatively also be designed as a disc, arranged equidistantly along its circumference.
  • the carrier 25 is fastened to the saw blade 11 in such a way that the cutting edges 201 of the secondary cutter teeth 20 lie approximately at the level of the tooth base of the main cutter teeth 15.
  • Each tooth base is recessed by a radially extending channel 26 which extends over the radial width of the annular carrier 25.
  • the plurality of channels 26 is used to discharge the chips generated by the re-cutting teeth 20 during the sawing process.
  • Fig. 9 the saw blade 11 and the attached ring-shaped carrier 25 with its circumferential secondary teeth 20 are shown in sections.
  • Fig. 10 shows sections of the other saw blade 12 with the
  • Main cutter teeth 16, which - like the sectional view of the 11 shows - is arranged coaxially to the saw blade 11 and the support 25, the annular support 25 being located between the two saw blades 11, 12.
  • the axial distance between the two saw blades 11, 12 in FIGS. 11 and 12 is drawn very large for the sake of clarity. The real one
  • the annular carrier 25 is supported axially on the blade plane of the saw blade 12.
  • the carrier 25 or the saw blade 12 is provided with a friction-reducing coating on the sides facing one another.
  • the axial thickness of the carrier 25 is selected so that when the carrier 25 rests on the saw blade 12, the mutually facing inner secondary cutting edges 153 and 163 on the saw blades 11 and 12 can turn past one another.
  • the trimmer teeth 20 are preferably machined from the material of the carrier 25, HSS or tool steel being used as the material for the carrier 25.
  • the trimmer teeth 20 can also be made as separate teeth made of another material, e.g. Carbide to be soldered to the carrier.
  • the advantage of the sawing tool described last over the sawing tools previously described for FIGS. 1-8 is that the carrier 25 can be produced with a constant axial thickness and that no grooves or shoulders are required in the saw blades 11, 12. On the one hand, this minimizes the so-called flattening of the sawing tool and, on the other hand, the costs for its manufacture, which is due in particular to the grinding effort, are reduced.

Landscapes

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

Abstract

L'invention concerne un outil de sciage pour une scie circulaire mécanique portative, présentant deux lames (11, 12) de scie coaxiales, pouvant fonctionner en sens opposé et tournant directement à côté l'une de l'autre. Ces lames présentent chacune une denture extérieure (13, 14) représentant un tranchant principal. L'objectif de cette invention est d'améliorer le résultat de coupe même en cas d'usure progressive du tranchant et d'éviter tout endommagement au niveau des dentures (13, 14) dans le cas d'une course axiale incorrecte des lames (11, 12) de scie. A cet effet, un tranchant secondaire (10) est placé entre les deux lames (11, 12) de scie pour l'usinage d'un talon (171) de matière restant éventuellement dans une coupe entre les lames (11, 12) de scie, lequel talon est lié à une des lames (11, 12) de scie de manière résistante à la torsion et présente un recouvrement axial avec les tranchants principaux.
EP01974049A 2000-12-02 2001-09-15 Outil de sciage pour une scie circulaire mecanique portative presentant deux lames de scie coaxiales, pouvant fonctionner en sens oppose et tournant directement l'une a cote de l'autre Withdrawn EP1341633A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059978A DE10059978A1 (de) 2000-12-02 2000-12-02 Sägewerkzeug für eine Handkreissägemaschine
DE10059978 2000-12-02
PCT/DE2001/003556 WO2002043912A1 (fr) 2000-12-02 2001-09-15 Outil de sciage pour une scie circulaire mecanique portative presentant deux lames de scie coaxiales, pouvant fonctionner en sens oppose et tournant directement l'une a cote de l'autre

Publications (1)

Publication Number Publication Date
EP1341633A1 true EP1341633A1 (fr) 2003-09-10

Family

ID=7665575

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974049A Withdrawn EP1341633A1 (fr) 2000-12-02 2001-09-15 Outil de sciage pour une scie circulaire mecanique portative presentant deux lames de scie coaxiales, pouvant fonctionner en sens oppose et tournant directement l'une a cote de l'autre

Country Status (6)

Country Link
US (1) US20030000363A1 (fr)
EP (1) EP1341633A1 (fr)
JP (1) JP2004513799A (fr)
CN (1) CN1396849A (fr)
DE (1) DE10059978A1 (fr)
WO (1) WO2002043912A1 (fr)

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See references of WO0243912A1 *

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WO2002043912A1 (fr) 2002-06-06
US20030000363A1 (en) 2003-01-02
CN1396849A (zh) 2003-02-12
DE10059978A1 (de) 2002-06-06
JP2004513799A (ja) 2004-05-13

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