EP1574308A2 - Fräswerkzeug - Google Patents

Fräswerkzeug Download PDF

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Publication number
EP1574308A2
EP1574308A2 EP05101789A EP05101789A EP1574308A2 EP 1574308 A2 EP1574308 A2 EP 1574308A2 EP 05101789 A EP05101789 A EP 05101789A EP 05101789 A EP05101789 A EP 05101789A EP 1574308 A2 EP1574308 A2 EP 1574308A2
Authority
EP
European Patent Office
Prior art keywords
blade
wall
hollow
tool
clamping element
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Withdrawn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
EP05101789A
Other languages
English (en)
French (fr)
Other versions
EP1574308A3 (de
Inventor
Alberto Filiputti
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.)
STARK SpA
Original Assignee
STARK SpA
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 claimed from ITUD20040043 external-priority patent/ITUD20040043A1/it
Priority claimed from ITUD20040148 external-priority patent/ITUD20040148A1/it
Application filed by STARK SpA filed Critical STARK SpA
Publication of EP1574308A2 publication Critical patent/EP1574308A2/de
Publication of EP1574308A3 publication Critical patent/EP1574308A3/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B27G13/08—Cutter blocks; Other rotary cutting tools in the shape of disc-like members; Wood-milling cutters
    • B27G13/10—Securing the cutters, e.g. by clamping collars

Definitions

  • the present invention concerns a milling tool, used essentially but not only for working wood, comprising a main body able to be made to rotate and on the periphery of which one or more blades are mounted.
  • Milling tools comprising a main body able to be made to rotate and on the periphery of which one or more blades are mounted, with a substantially radial arrangement, by means of which the desired working is performed.
  • Each blade is removably associated with the main body in correspondence with a relative hollow, by means of a clamping element or block, and by at least one screw that clamps it under pressure against a wall of said hollow.
  • One purpose of the present invention is to achieve a milling tool which will allow a precise, self-centering positioning together with a stable clamping of the blades with respect to the main body, at the same time allowing rapid and easy operations to assemble/dis-assemble said blades.
  • the milling tool according to the invention comprises a main body able to be made to rotate, at least a blade and at least a clamping element, or block, able to clamp the blade removably, in cooperation with screw means, onto the periphery of the main body.
  • the clamping element is arranged between a first and a second wall of a hollow on the main body, clamping the blade, thanks to the screw means, against the second wall.
  • the hollow has a discharge surface, open on the outside of the main body and as an extension of the first wall, able to facilitate the discharge of the chip.
  • the clamping element has a threaded hole inside which the screw means are screwed; the latter act as a draw rod to determine the clamping thrust on the blade by the block.
  • the clamping element has a front surface able to be arranged in abutment on the blade, in order to exert the clamping thrust, in an inclined position with respect to the second wall of the hollow.
  • at least part of the front surface is inclined by an angle of between 0.5° and 5°, advantageously between 1° and 2°, with respect to a plane orthogonal to the axis of the threaded hole, in order to guarantee a secure contact with the upper part of the blade.
  • the front surface of the clamping element has a progressively decreasing section, going towards the end which, in use, is external, so as to ensure a certain level of flexibility and elasticity which ensure a more effective clamping of the relative blade.
  • the main body has, on the same axis, at least a through hole and a blind hole communicating with the hollow, with respect to which holes the threaded hole is able to be aligned; the screw means are able to pass through the through hole and be inserted with the end in the blind hole, so as to facilitate the correct positioning of the clamping element on which they are to be screwed.
  • the blind hole is open on the first wall of the hollow, while the through hole is open on the second wall of the hollow and communicates with a channel accessible from outside so as to insert and screw in the screw means.
  • the clamping element in correspondence with its lower end has a protrusion facing towards the second wall of the hollow against which the blade is clamped.
  • This protrusion is defined by two segments of surface at an angle to each other, with an angle of between about 70° and 110°, and is able to cooperate with a mating recess, also of an angled shape and substantially of the same angle, made at the base of the second wall.
  • the precise coupling in shape of the angled protrusion of the clamping element and the angled recess of the hollow guarantees a precise self-centering and stable positioning without play, which prevents any kind of oscillation or unwanted movement of the clamping element.
  • this coupling in shape of the protrusion and the recess contributes to preventing the axial detachment of the clamping element even in the inactive position of the tool with the clamping screw partly loosened.
  • the clamping element has positioning and centering means able to cooperate with mating coupling means present on the blade, in order to facilitate the correct arrangement of the latter.
  • the number 10 denotes in its entirety the milling tool according to the invention, which comprises a main body 11, able to be made to rotate, and two blades 12 removably mounted on its periphery by means of relative clamping blocks 13 and screws 14.
  • the main body 11 has corresponding hollows 15 on the periphery, arranged radially, in correspondence with each of which a block 13 can be inserted in order to clamp a mating blade 12.
  • Each hollow 15 defines a first 16 and a second 17 wall, substantially parallel to each other, a bottom 18 and a discharge surface 19, arranged as an extension of the first wall 16 and open towards the outside of the main body 11, in order to facilitate the discharge of the chip from the hollow 15.
  • the second wall 17 has a recess 17a and a tooth 17b in correspondence with which the blade 12 is positioned. Laterally to each hollow 15 there is a channel 20 open towards the outside of the main body 11 and communicating with the hollow 15, in correspondence with the second wall 17 by means of a through hole 21.
  • a blind hole 22 is made on the first wall 16, in alignment with the through hole 21.
  • the block 13 is inserted between the first wall 16 and the second wall 17, resting on the bottom 18, and has a threaded through hole 23 which is aligned with the through hole 21 and the blind hole 22.
  • the block 13 In its segment facing towards the outside of the hollow 15, the block 13 also has a front surface 25 able to be arranged in abutment on the blade 12, and a rear connecting surface 26, partly curvilinear, able to be arranged in continuity with the discharge surface 19 of the hollow 15.
  • the connecting surface 26 has a progressively decreasing section from the inside to the outside of the block 13, so as to confer characteristics of flexibility and elasticity which improve the clamping properties thereof when the block 13 is clamped onto the blade 12.
  • the block 13 At one end of the connecting surface 26, and in an opposite position with respect to the position of the blade 12, the block 13 has an edge 24 protruding laterally, facing towards the discharge surface 19 and able to be at least partly superimposed on the edge between the discharge surface 19 and the first wall 16; in correspondence with the front surface 25, the block 13 has one or more pins 27, two in the case shown here, able to be inserted into mating holes 28 present on the blade 12 to prevent it from accidentally coming out.
  • the portion of the front surface 25 arranged towards the outside with respect to the threaded hole 23, that is, the one on which the pins 27 are found, is angled by an angle ⁇ , with an amplitude of about 1°, with respect to the plane "A" orthogonal to the axis "x" of the threaded hole 23 (fig. 8).
  • the block 13 In its innermost segment, in the terminal lower part of the front surface 25, the block 13 has a protrusion 29 which, in the solution shown in figs. 2+4, is able to couple with the second wall 17.
  • the screw 14 has a head 14a, advantageously with a "Torx" type impression, a smooth rear segment 14b and a smooth front segment 14d and a threaded central segment 14c; the rear segment 14b and the front segment 14d are respectively housed in the through hole 21 and the blind hole 22, while the central segment 14c is screwed inside the threaded hole 23 of the block 13.
  • a blade 12 is clamped inside the relative hollow 15 as follows.
  • the block 13 is put inside the hollow 15, resting on the bottom 18 so as to align the threaded hole 23 with the holes 21 and 22 of the main body 11.
  • the blade 12 is inserted between the front surface 25 of the block 13 and the recess 17a of the second wall 17, resting on the tooth 17b, so that the pins 27 are inserted into the mating holes 28, univocally determining the correct positioning of the blade 12.
  • the screw 14 is inserted into the through hole 21 and screwed with the central segment 14c inside the threaded hole 23, while the front segment 14d is inserted inside the blind hole 22, promoting the correct positioning of the block 13.
  • the block 13 By screwing the screw 14 , which acts as a draw rod, the block 13 is brought near the second wall 17, with a consequent thrust of the blade 12 on the recess 17a (figs. 3 and 6).
  • the type of screw 14 used allows a high clamping torque to be applied; moreover, the fact that the protrusion 29 rests on the second wall 17 and that the front surface 25 is inclined guarantees the progressive distribution of a great pressure of the block 13 on the entire surface of the blade 12, contributing to making the clamping of the latter more stable and secure.
  • both the protrusion 29 and the cavity 17c are defined by respective segments of wall that form between them an angle ⁇ preferably between 70° and 110°, advantageously around 90°.
  • the presence of the angled protrusion 29 and the corresponding angled cavity 17c facilitates the self-centering and self-positioning of the block 13; during the assembly step the coupling of the relative mating angled surfaces determines, when the screw 14 is tightened, the stable positioning of the block 13 in the hollow 15, without play and in a secure position. In the assembled position, the block 13 is prevented from making any movement of oscillation or rotation since the respective angled segments that form the protrusion 29 and the cavity 17c do not allow any type of oscillatory movement.
  • the coupling of the protrusion 29 and the cavity 17c prevents the radial detachment of the block 13, and hence of the blade 12, even in the inactive condition when the screw 14 is partly loosened.
  • the position of the channel 20 behind the blade 12 does not communicate directly with the hollow 15 and reduces the risk of chip deposit inside it, making the interventions on the screw 14 easier.
  • the block 13 can have any conformation whatsoever and can have positioning and centering means other than pins 27.
  • the front surface 25 could be orthogonal to the axis "x" of the threaded hole 23 in all its extension, inclining with respect to the second wall 17 of the main body 11 due to the effect of the abutment on the latter by the protrusion 29, which acts as a fulcrum, when the screw 14 is screwed in.
  • the screw 14 the use of a grub screw or dowel can be provided.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Milling Processes (AREA)
EP05101789A 2004-03-09 2005-03-08 Fräswerkzeug Withdrawn EP1574308A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITUD20040043 2004-03-09
ITUD20040043 ITUD20040043A1 (it) 2004-03-09 2004-03-09 Utensile di fresatura
ITUD20040148 ITUD20040148A1 (it) 2004-07-16 2004-07-16 Utensile di fresatura
ITUD20040148 2004-07-16

Publications (2)

Publication Number Publication Date
EP1574308A2 true EP1574308A2 (de) 2005-09-14
EP1574308A3 EP1574308A3 (de) 2005-11-16

Family

ID=34828707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05101789A Withdrawn EP1574308A3 (de) 2004-03-09 2005-03-08 Fräswerkzeug

Country Status (1)

Country Link
EP (1) EP1574308A3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138326A1 (de) 2007-05-09 2008-11-20 Leitz Gmbh & Co. Kg Schneidwerkzeug mit einem tragkörper
EP2923789A1 (de) * 2014-03-27 2015-09-30 Centerinox S.r.l. Fräswerkzeug
WO2024119256A1 (pt) * 2022-12-06 2024-06-13 Irani Papel E Embalagem S.A. Dispositivo de corte para resinador mecânico

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552876A1 (de) * 1975-11-25 1977-06-02 Greiner Gmbh & Co Hobelkopf mit mindestens einem auswechselbaren messer
FR2443318A1 (fr) * 1978-12-08 1980-07-04 Caumette Georges Outil a rainer le bois a plaquettes reversibles jetables
US6004079A (en) * 1992-08-03 1999-12-21 Gebruder Leitz Gmbh & Co. Et Al. Cutter head, in particular a profile cutter head
EP1013385A1 (de) * 1998-12-23 2000-06-28 Rekord S.R.L. Schneideinsatzspanneinrichtung für eine Fräsmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552876A1 (de) * 1975-11-25 1977-06-02 Greiner Gmbh & Co Hobelkopf mit mindestens einem auswechselbaren messer
FR2443318A1 (fr) * 1978-12-08 1980-07-04 Caumette Georges Outil a rainer le bois a plaquettes reversibles jetables
US6004079A (en) * 1992-08-03 1999-12-21 Gebruder Leitz Gmbh & Co. Et Al. Cutter head, in particular a profile cutter head
EP1013385A1 (de) * 1998-12-23 2000-06-28 Rekord S.R.L. Schneideinsatzspanneinrichtung für eine Fräsmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138326A1 (de) 2007-05-09 2008-11-20 Leitz Gmbh & Co. Kg Schneidwerkzeug mit einem tragkörper
JP2010525957A (ja) * 2007-05-09 2010-07-29 ライツ・ゲーエムベーハー・ウント・コンパニー・カーゲー 支持体を有する切削工具
CN101687337B (zh) * 2007-05-09 2012-08-29 莱茨两合公司 具有承载体的切削刀具
US8739844B2 (en) 2007-05-09 2014-06-03 Leitz Gmbh & Co. Kg Cutting tool with a supporting body
EP2923789A1 (de) * 2014-03-27 2015-09-30 Centerinox S.r.l. Fräswerkzeug
WO2024119256A1 (pt) * 2022-12-06 2024-06-13 Irani Papel E Embalagem S.A. Dispositivo de corte para resinador mecânico

Also Published As

Publication number Publication date
EP1574308A3 (de) 2005-11-16

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