EP1349692A1 - Outil de sciage pour une scie circulaire mecanique portative presentant des lames de scie coaxiales pouvant fonctionner en sens oppose - Google Patents

Outil de sciage pour une scie circulaire mecanique portative presentant des lames de scie coaxiales pouvant fonctionner en sens oppose

Info

Publication number
EP1349692A1
EP1349692A1 EP01978200A EP01978200A EP1349692A1 EP 1349692 A1 EP1349692 A1 EP 1349692A1 EP 01978200 A EP01978200 A EP 01978200A EP 01978200 A EP01978200 A EP 01978200A EP 1349692 A1 EP1349692 A1 EP 1349692A1
Authority
EP
European Patent Office
Prior art keywords
saw
blade
blades
saw blades
cutting edges
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.)
Ceased
Application number
EP01978200A
Other languages
German (de)
English (en)
Inventor
Albrecht Hofmann
Ivo Gruber
Thomas Schomisch
Christian Walker
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 EP1349692A1 publication Critical patent/EP1349692A1/fr
Ceased legal-status Critical Current

Links

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
    • 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
    • B23D61/025—Details of saw blade body
    • B23D61/026—Composite body, e.g. laminated
    • 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
    • Y10T83/9362—Teeth having transversely curved cutting edge

Definitions

  • the invention relates to a sawing tool for a circular saw machine with two directly past one another in opposite directions drivable rotating f ,, coaxial saw blades 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.
  • the sawing tool according to the invention in each of its embodiments according to claims 1, 2, 3, 6 and 8 has the basic advantage that an axial force component is present in the work case, which at least presses the tooth areas of the two saw blades in the workpiece engagement, and also the Another advantage that this force component is achieved with inexpensive manufacturing technology measures, so that the
  • the cutting edges which are at the front in the direction of rotation, lie in a plane running through the coaxial saw blade axes
  • the outer rounding of the two saw blades which in turn generates an axial force component inward, in addition to the production-related advantage described above, also provides a higher level of security against cutting edge breakouts, which occur especially in hand-held machines due to vibrations.
  • the axial force component is not generated by the feed of the saw tool, but the teeth of the saw blades are pressed together by an elastic prestress, so that the saw blades resiliently abut each other in the area of their teeth with a small spring constant.
  • This spring force holds the saw blades together in the cut and counteracts the saw blades being pushed apart during work.
  • Such an axial preload can be implemented in various ways, e.g. with the constructive measures specified in claim 4 or claim 5.
  • the embodiment of the invention according to claim 6 has the advantage that no modifications to the to generate the axial force component for the cohesion of the saw blades Saw blades must be made so that conventional, inexpensive saw blades can be used. Due to the slight inclination of the saw blades or the saw blade axes, which intersect in the plane of symmetry of the saw tool, part of the toothing on the two saw blades is pressed together, which leads to an inward axial force component that holds the saw blades together in the cut.
  • the outer blade surfaces of the master blades of the two saw blades which face away from one another, are set back somewhat from the outer secondary cutting edges turned away from one another.
  • the axial force component for holding the saw blades together in the case of work is achieved in that the secondary cutting edges lying on mutually facing blade sides are set outwards relative to the master blades so that the plane in which the secondary cutting edges lie with the Master blade includes the smallest possible helix angle.
  • the corner angle between the main and outer minor cutting edge is as large as possible, but still less than 90 °, which leads to a strong, axial cohesion of the saw blades in the work case than with a larger helix angle of the minor cutting edges.
  • the air guiding means have through bores made in the master blades, which are preferably arranged equidistantly on a circle of dividers concentric to the saw blade axis. Air swirling around the teeth is achieved through these through holes.
  • the air guiding means have wing-shaped spokes which are formed in the master blades in the radial direction.
  • the spokes can have a constant or a continuously increasing cross-section.
  • the cross-sectional profile of the spokes can be angular, the spokes being inclined to the plane of the saw blade, or can be optimized in terms of flow and be designed like an airplane wing.
  • elongated holes or grooves which overlap the pairs of holes when the two saw blades rotate.
  • the holes can be made at an angle in the master blades, so that the hole axes are inclined to the saw blade level. In the same way, the end regions of the grooves or elongated holes are made obliquely. This further supports the airflow.
  • the air guiding means in the main blade of the one saw blade are preferably offset through holes arranged on the divider circle by preferably the same circumferential angle and radially extending elongated holes are arranged on the master blade of the other saw blade and are offset in the master blade circumference
  • the tooth gap base of the toothing of the saw blade having the through bores is preferably drawn inward more deeply than in the other saw blade.
  • identically arranged grooves can be provided.
  • a further optimization of the sawing tools presented in the direction of an improvement in the cutting result is achieved if, according to an advantageous embodiment of the Invention in the toothing of the two saw blades that in the direction of rotation behind the main cutting edges of the main cutting edge free surfaces receive a contour that starts from the main cutting edge and rises again towards the following tooth.
  • the rising contour reduces the maximum possible feed per tooth, which reduces vibrations. With the reduction of the feed rate, the maximum will be
  • Feed speed is reduced, but the advantage of vibration reduction outweighs the limited performance of hand-held circular saws and the comparatively flexible guidance of the machine by the user.
  • 1 is a plan view of a sawing tool with two circular saw blades rotating in opposite directions
  • Fig. 2 is a section along the line II - II in Fig. 1
  • Fig. 3 is an enlarged view of the detail
  • FIG. 4 is a top view of the development of the toothing in the direction IV in FIG. 3,
  • FIG. 5 shows a section along the line V - V in FIG. 3, 6 shows the same representation as in FIG. 5 of a sawing tool according to a further exemplary embodiment
  • FIG. 7 is a side view of a sawing tool according to a third embodiment
  • FIG. 8 is a side view of a sawing tool according to a fourth embodiment
  • FIG. 9 is a side view of a sawing tool according to a fifth embodiment
  • FIGS. 5 and 6 show the same representation as in FIGS. 5 and 6 of a sawing tool according to a sixth exemplary embodiment
  • FIGS. 1-6 shows a plan view of the master blade of one to 14 saw blades of the sawing tool in FIGS. 1-6 according to three exemplary embodiments
  • Fig. 15 is a section along the line XV - XV in
  • 16 shows the same representation as in FIG. 15 according to a further exemplary embodiment
  • 17 shows a longitudinal section of the master blades of a sawing tool according to FIGS. 1-6 with a cut along the line XVII - XVII in FIG. 19 in two variants
  • FIG. 19 is a plan view in the direction of arrow IXX in FIG. 17
  • Fig. 20 is a partial plan view of a
  • Fig. 21 is a partial plan view of a
  • the sawing tool for a hand-held circular sawing machine shown in FIGS. 1-5 in different views and sections has two coaxial circular saw blades rotating in opposite directions, which can be driven in opposite directions, in the following
  • Saw blades 11, 12 called which, after being clamped in the tool holder of a hand-held circular saw machine, not shown here, are each connected in a rotationally fixed manner to one of two concentrically arranged, counter-rotating drive spindles.
  • Each saw blade 11 or 11 ' has a master blade 12 or 12 ! and a the master sheet 12 or 12 'enclosing, with this one-piece toothing 13 or 13' from a plurality of equidistantly arranged teeth 14 or 14 'radially protruding from the main blade 12, 12'.
  • Fig. 1 only four teeth 14, 14 'of the circumferential teeth 13, 13' are shown and the rest of the saw blade 11 is indicated with a circle running along the tooth tips.
  • Each tooth 14 or 14 ' has a main cutting edge 16 or 16' pointing in the direction of rotation 15 or 15 '(FIG. 4) and two secondary cutting edges 17 or 17' running radially to the side thereof.
  • Main cutting edges 16 and 16 'and secondary cutting edges 17 and 17' meet at the cutting edges.
  • the outer secondary cutting edges 17 and 17 ' which face away from one another when the saw blades 11, 11' are adjacent to one another, are set slightly against the respective main blade 12 or 12 ', so that the outer cutting edges formed by main cutting edges 16, 16' and outer secondary cutting edges 17, 17 ' Project axially beyond the outer surface of the respective master sheet 12 or 12 '. As shown in FIGS.
  • each of the cutting edges 161 and 161 'of the main cutting edges 16 and 16' which is at the front in the direction of rotation, lies in a plane running through the saw blade axis 18 and 18 ', at the same time the main cutting edges 17, 17' in the direction of the saw blade axis 18 or 18 ! are so beveled that the main cutting edges 17, 17 'fall from the mutually facing blade sides of the saw blades 11, 11' towards the mutually facing blade sides.
  • the helix angle of the main cutting edges 17 and 17 ' is marked in FIG. 5 with ⁇ and ⁇ ' and is of the same size for both saw blades 11, 11 r .
  • This helix angle ⁇ or ⁇ ' is applied to the main cutting edges 16 and 16' by a compressive force F D , which is caused by the user pressure and half with the compressive force F D ⁇ and F D2 . acts, generates an axial force F Ai and F A2 , which is equal to ⁇ F D e tan ⁇ .
  • This axial force ensures with increasing pressure F D. ⁇ en the user exerts on the machine and the sawing tool on average, for increasing axial cohesion of the two saw blades 11, 11 '.
  • this axial force F A ⁇ or F A2 which counteracts the pushing apart of the two saw blades 11, 11 'in the cutting area, by rounding off the transition from the main cutting edge 16 or 16' of the secondary cutting edge 17 or 17 'obtained when the saw blades 11, 11' lie against one another.
  • the rounding of the cutting edge transition also brings greater security against cutting edge corner breakouts, which occur especially on hand-held machines as a result of vibrations.
  • the axial force for holding the saw blades 11, 11 'together is achieved in the case of work by axially prestressing the saw blades 11, 11'.
  • the two saw blades 11, 11 ' lie axially against one another in the region of their toothing 13, 13 r with a small spring constant.
  • the elastic bias in the axial direction is achieved in that the
  • Master blades 12, 12 'of the two saw blades 11, 11' have a tapering, to a certain extent conical shape towards the blade sides facing away from one another, which is obtained after the manufacturing process by a forging process. 7, the saw blades 11, 11 ! solid in her relaxed position and dashed in her Clamping position shown in the tool holder of the hand-held circular saw, in which they receive the elastic preload.
  • each master blade 12 or 12' stands in the direction of the other master blade 12 'or 12 a clamping hub 19 or 19.
  • the height of the clamping hubs 19, 19 ' is dimensioned in such a way that at the end it goes back behind the plane of the adjacent inner cutting edges 17, 17'.
  • the saw blades 11, 11 'lying against one another without pretensioning are shown in FIG 8. If the sawing tool is clamped into the tool holder of the hand-held circular sawing machine, the two saw blades 11, 11 'assume the position shown in broken lines in Fig. 8, whereby the teeth 13, 13' of the two saw blades 11, 11 'are pressed axially against one another become.
  • the axial force which prevents the saw blades 11, 11 'from being pushed apart in the case of work is generated by inclining the saw blades 11, 11'.
  • the two saw blades 11, 11 ' are at a small acute angle ß against each other so that the saw blade axes 18, 18' intersect in the plane of symmetry 20 of the saw tool.
  • Fig. 10 this is The adjacent cutting edges 17, 17 'lying against one another are shown enlarged during the engagement in a workpiece 21.
  • the outer blade surfaces of the rake blades 12, 12 ' which face away from one another are set back somewhat from the outer secondary cutters 17, 17' which face away from one another, so that there is little or no lateral friction on the cut edges over the depth of cut.
  • Inner surfaces 221, 222 of the cut 22 occur in the workpiece 21.
  • the axial force F Ai or F A2 is achieved by large corner angles between the main cutting edge 16 or 16 'and the outer secondary cutting edge 17 or 17'.
  • This corner angle is chosen as large as possible, but always smaller than 90 °.
  • the secondary cutting edges 17 and 17 'lying on opposite sides of the blade are positioned relative to the main blade 12 and 12' in such a way that the plane in which the outer secondary cutting edges 17 and 17 'lie, with the associated master blade 12 or 12' includes the smallest possible helix angle ⁇ or ⁇ '.
  • Saw blades 11, 11 ' are selected to be the same size; in comparison, the inclined position of the outer secondary cutting edge 17, as is customary in conventional saw blades, is shown in broken lines in FIG. 11.
  • the helix angle ⁇ * is significantly larger than the helix angle ⁇ of the novel saw blade 11.
  • the master blade 12 has through holes 23 which are preferably arranged in an aquidistant manner on a part of the saw blade axis 18 which is concentric.
  • the not visible master sheet 12 'of the saw blade 11' has identical holes. Due to the rotating through bores 23 and 23 'passing through each other, air swirling is achieved in sawing operation, which causes a cooling effect on the toothings 13, 13' and on the master blades 12, 12 '.
  • spokes 24 and 25 are formed in the master page 12 of the saw blade 11, which extend in the radial direction and in the exemplary embodiment of FIG. 13 have a constant cross section over their length, while in the exemplary embodiment of FIG 14 have a continuously increasing cross-section towards the outside.
  • the spokes 24 have a rectangular profile and are positioned in relation to the plane of the saw blade so that they rotate the air inward like a scoop conduct.
  • the spokes 24 have a flow-optimized profile similar to the profile of an aircraft wing.
  • the master blade 12 'of the other saw blade 11' which is not shown in FIGS. 13-16, is of identical design.
  • Circumferential angles spaced apart from one another and extending in the radial direction are realized, which, when the two saw blades 11, 11 'rotate, intersect the pairs of through bores 26 with their end region.
  • a modification is shown in the lower part of FIGS. 17-19.
  • the elongated holes are replaced by grooves 28 placed in the same place, as can be seen in section in FIG. 17 and in dashed lines in a concealed top view in FIG. 19.
  • grooves 28 are provided instead of elongated holes 27, the amount of air conveyed per revolution is higher, since no lateral escape of the air is possible, as is the case with elongated holes 27.
  • air guide means for the air supply to the toothings 13, 13' are again provided in the master blades 12, 12 '.
  • Elongated holes 30 each open into a tooth space 31 on the circumference of the master blade and are dimensioned so long that when the two saw blades 11, 11 'rotate, their end region facing away from the mouth intersects the through bores 29.
  • the tooth space base 311 of the saw blade 11 having the through bores 29 is drawn radially lower than the tooth space base 311 'in the toothing 13' of the other saw blade 11 ⁇ .
  • grooves of the same design can also be provided. 20 of the toothings 13,
  • all toothings 13, 13 ′ are advantageously designed as shown in FIG. 21 is shown in detail for a saw blade 11.
  • the main cutting edge free areas 32 lying behind the main cutting edges 16 in the direction of rotation are given a contour which starts from the main cutting edge 16 and rises again towards the subsequent tooth 14.
  • This increase reduces the maximum possible feed per tooth 14, which is determined by the dimension z in FIG. 21.
  • this reduction also reduces the maximum feed rate, the advantage of vibration reduction outweighs the limited performance of hand-held circular saws and the comparatively flexible guidance by the user.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne un outil de sciage pour une scie circulaire mécanique portative, présentant deux lames (11, 11') de scie coaxiales, pouvant fonctionner en sens opposé et tournant directement à côté l'une de l'autre. L'objectif de cette invention est de permettre la production structurellement simple d'une force axiale, agissant contre l'écartement des lames (11, 11') de scie lors du processus de coupe, sur chaque lame (11, 11') de scie. A cet effet, l'arête de coupe avant (161, 161') dans le sens de rotation de chaque tranchant principal (16, 16') se situe dans un plan s'étendant à travers l'axe (18, 18') des lames de scie et les tranchants principaux (16, 16') sont biseautés dans le sens de l'axe (18, 81') des lames de scie, de sorte qu'ils s'inclinent depuis les côtés adjacents des lames (11, 11') de scie jusqu'aux côtés de lames opposés.
EP01978200A 2000-12-02 2001-09-29 Outil de sciage pour une scie circulaire mecanique portative presentant des lames de scie coaxiales pouvant fonctionner en sens oppose Ceased EP1349692A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10059969 2000-12-02
DE2000159969 DE10059969A1 (de) 2000-12-02 2000-12-02 Sägewerkzeug für eine Handkreissägemaschine
PCT/DE2001/003751 WO2002043911A1 (fr) 2000-12-02 2001-09-29 Outil de sciage pour une scie circulaire mecanique portative presentant des lames de scie coaxiales pouvant fonctionner en sens oppose

Publications (1)

Publication Number Publication Date
EP1349692A1 true EP1349692A1 (fr) 2003-10-08

Family

ID=7665569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01978200A Ceased EP1349692A1 (fr) 2000-12-02 2001-09-29 Outil de sciage pour une scie circulaire mecanique portative presentant des lames de scie coaxiales pouvant fonctionner en sens oppose

Country Status (5)

Country Link
US (1) US20030136242A1 (fr)
EP (1) EP1349692A1 (fr)
JP (1) JP2004513798A (fr)
DE (1) DE10059969A1 (fr)
WO (1) WO2002043911A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528019C2 (sv) * 2004-12-02 2006-08-08 Indocean Diamond Tools Bermuda Sågblad och förfarande för tillverkning av ett sågblad
WO2008057028A1 (fr) * 2006-11-09 2008-05-15 Twinblade Technologies Holding Sweden Ab Dispositif moyeu
CA2705443C (fr) * 2006-11-09 2017-06-13 Twinblade Technologies Holding Sweden Ab Paire de lames de scie
CN102615351A (zh) * 2012-04-06 2012-08-01 苏州天健旋切技术有限公司 一种旋转对切锯片的制造结构
CN102513608A (zh) * 2011-12-17 2012-06-27 徐根裕 成对锯片
EP3417969A1 (fr) * 2017-06-23 2018-12-26 Technische Universität München Disque de coupe double à lignes de déformation en courbe
CN117086401B (zh) * 2023-06-13 2024-04-02 重庆敏德兴模具材料科技有限公司 一种模具钢加工设备及加工方法

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DE1042873B (de) * 1955-11-21 1958-11-06 Inst Holztechnologie Zahnform fuer Kreissaegeblaetter mit Spandickenbegrenzung
US4215451A (en) * 1979-05-10 1980-08-05 Best & Donovan Dehider
US4589458A (en) * 1984-10-29 1986-05-20 Vermont American Corporation Multiple saw blade adjustable dado cutter
SE8405405D0 (sv) * 1984-10-29 1984-10-29 Vigilantia Ab Sjelvstyrande sag
DE8532717U1 (de) * 1985-11-19 1986-01-23 HOWENA GmbH Wittenborn + Edel, 7443 Frickenhausen Scheibenförmiges Werkzeug zum Trennschneiden und Formatbearbeiten
SU1586905A1 (ru) * 1987-09-25 1990-08-23 Азербайджанский научно-исследовательский институт механизации и электрификации сельского хозяйства Механизм резани круглопильного станка
SE505345C2 (sv) * 1994-11-01 1997-08-11 Sven Runo Vilhelm Gebelius Sågklinga
ES2170278T3 (es) * 1995-10-12 2002-08-01 Gebelius Hjordis Florence Mari Procedimiento para impedir o reducir la formacion de magnetismo en dos cuchillas de sierra, adyacentemente situadas, que giran en sentidos opuestos, y un dispositivo para la utilizacion del procedimiento.
JPH10118838A (ja) * 1996-10-15 1998-05-12 Rex Ind Co Ltd 両回転切断機

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Title
See references of WO0243911A1 *

Also Published As

Publication number Publication date
WO2002043911A1 (fr) 2002-06-06
US20030136242A1 (en) 2003-07-24
DE10059969A1 (de) 2002-06-06
JP2004513798A (ja) 2004-05-13

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