EP4082734A1 - Schneidkopf für eine maschine zur spanabhebenden bearbeitung von materialien - Google Patents

Schneidkopf für eine maschine zur spanabhebenden bearbeitung von materialien Download PDF

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Publication number
EP4082734A1
EP4082734A1 EP22170218.6A EP22170218A EP4082734A1 EP 4082734 A1 EP4082734 A1 EP 4082734A1 EP 22170218 A EP22170218 A EP 22170218A EP 4082734 A1 EP4082734 A1 EP 4082734A1
Authority
EP
European Patent Office
Prior art keywords
cutter
clamping block
cutting head
housing cavity
clamping
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.)
Pending
Application number
EP22170218.6A
Other languages
English (en)
French (fr)
Inventor
Simone Fantacci
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.)
Fantacci Industrie Srl
Original Assignee
Fantacci Industrie Srl
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 Fantacci Industrie Srl filed Critical Fantacci Industrie Srl
Publication of EP4082734A1 publication Critical patent/EP4082734A1/de
Pending 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
    • 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
    • B27G13/12—Cutter blocks; Other rotary cutting tools for profile cutting

Definitions

  • the present invention relates to the technical field of milling machines.
  • the invention relates to a cutting head for machinery suitable for carrying out machining by chip removal on materials.
  • the milling operation is known to be carried out by means of machine tools in which the milling cutter is mounted on a rotating spindle, which is provided with a main cylindrical body rotatable around a rotation axis thereof at the periphery of which one or more housings, or recesses, for cutters are identified.
  • the housings in question generally extend on the surface parallel to the rotation axis mutually spaced apart and accommodate a cutter, or knife, a clamping element and engagement means intended to bring the clamping element towards a reference wall of the housing so that the knife is clamped between the aforesaid clamping element and reference wall of the housing.
  • a known type of clamping includes, at the level of the reference wall, a groove suitable for abutting a projection obtained in the cutter, so as to provide a radial locking by mechanical interference of the knife.
  • the aforesaid mechanical interference locking system includes an inclined plane at said groove and a corresponding inclined plane in the projection of the cutter which perform the function of guiding the correct positioning in the radial direction of the cutter itself following the clamping action against the reference wall.
  • the device known from EP1574307 is characterized by a locking system which uses elastic means located underneath the clamping element, which push on the clamping element and exert the clamping force which keeps the cutter clamped between the clamping element itself and the reference wall of the housing.
  • Document US2017291322A1 anticipates a cutting system also comprising elastic means and includes a cutter, a clamping element which with the aid of a tensioning screw locks the cutter against a wall of the housing within which the cutting system and elastic elements are inserted.
  • the claimed system facilitates the operation of mounting the knife in the housing cavity and given the geometry of the housing cavity, the clamping block and the knife itself, the inclination angle of the inclined plane is of fundamental importance.
  • a cutting head for machinery suitable for carrying out machining by chip removal on materials which comprises a main body in which one or more housing cavities are obtained, each suitable for housing a respective cutter and a clamping block, with a clamping screw provided to actuate the clamping block so that said cutter is clamped between said clamping block and a reference wall of the housing cavity in question.
  • the cutting head in accordance with the present invention further includes elastic means intended to act between said housing cavity and said cutter, so as to push said cutter in a direction having at least one radial component facing outwards.
  • the reference wall of said housing cavity and the cutter show a geometry such as to make a mechanical interference fit in which an inclined plane is provided at the reference wall itself and a corresponding inclined plane in the cutter which perform the function of guiding the correct positioning in the radial direction of the cutter itself following the clamping action against the reference wall.
  • the device according to the invention is characterized in that the aforementioned elastic means comprise an elastic sheet element associated with the housing cavity with a cantilevered portion thereof located underneath a bottom surface of said cutter, so that when the cutter is in its working position abutting on said reference wall, the elastic sheet element is bent downwards by the bottom surface of said cutter, thus the elastic sheet element exerts an action tending to push said cutter radially outwards, in order to facilitate the extraction of the cutter from the housing cavity.
  • the replacement of the cutters with a device according to the present invention is quick and easy, due to the immediate and safe radial extraction of the cutter from the relative housing cavity.
  • the device according to the invention includes an anti-slip assembly associated with the clamping block, which allows to stabilize the clamping block itself in the steps of unscrewing the clamping and extraction screw of the cutter, thus ensuring a further increase in the safety and speed of the disassembly operations in question.
  • the elements forming the locking system are made of materials and according to geometries such as to allow a significant reduction of production and maintenance costs.
  • a cutting head for machinery suitable for carrying out machining by chip removal on materials of various kinds is generally indicated with reference number 1.
  • such cutting heads 1 comprise a main cylindrical body, suitable for being brought in rotation around the axis, Z, thereof at the periphery of which one or more (four, in this embodiment) housing cavities, 10, are obtained radially open, each intended to accommodate a relative cutter, 11.
  • the housing cavity 10 has a shape extending outwards and shows a deeper portion, 2, and an adjacent shallower portion, 3.
  • a deeper portion 2 is delimited by a reference wall, 4, adapted to receive the cutter 11, a bottom wall, 5, and a third auxiliary wall, 6, opposite and substantially parallel to the reference wall 4.
  • the shallower portion , 3, is delimited by the reference wall 4 and by a curved lightening wall, 7, which generates sufficient room for manoeuvring, as well as being suitable for allowing the chips to be unloaded.
  • each housing cavity 10 is arranged to accommodate a cutter 11 and a clamping block 12, the latter associated by means of a clamping screw, 13.
  • the cutter 11 as clearly visible in the exploded view of Fig. 3 , has a substantially rectangular shape and is provided at the upper end with a cutting edge, 14, and near the lower end of an opening, 15, included for the passage of the aforementioned clamping screw 13.
  • the cutter also shows a substantially flat side, 16, in contact with the clamping block 12, and a reference side, 17, opposite the substantially flat side 16 and intended to rest on the reference wall 4.
  • a reference side 17 of the cutter 11 has a recess, 18, which generates in the lower part a portion which is coplanar with the surface of the reference side 17 itself.
  • a geometry of the cutter 11 of this type reduces its costs, as it minimizes the removal of material necessary to make the cutter.
  • each housing cavity 10 has a side hole, 30, accessible from outside and leading into the reference wall 4 of the cavity itself, which hole is advantageously provided with a calibrated portion, 33, for the insertion of the clamping screw 13 and an enlarged portion, 34, for the passage of the screw head and also useful to allow the passage towards a second calibrated hole, 35, leading into the deeper portion 2 and useful for housing a pin for axial centering, 31, of the cutter 11 thanks to the presence in the latter of an abutment opening, 36.
  • the clamping screw 13, passing through the opening 15 included in the cutter 11 and engaging a threaded hole, 25, obtained in the clamping block 12 allows the pressure clamping of such a cutter 11 against the reference wall 4.
  • housings are obtained suitable for accommodating magnetic elements, 32, suitable for retaining the clamping screw 13 in the aforesaid enlarged portion 34 when it is disengaged from the clamping block 12.
  • the reference wall 4 is provided with an inclined plane, 19, intended to abut the conjugate recess, 18, obtained in the reference side 17 of the cutter 11, so as to guide the correct positioning in the radial direction of the cutter 11 following the clamping action against the reference wall 4, thus obtaining the fit commonly known in the field as mechanical interference fit.
  • such an inclined plane 19 obtained on the reference wall 4 forms an angle with the longitudinal surface facing outwards of the cutter 11 between 115° and 135°, preferably 120°.
  • the locking system according to the present invention further includes elastic means intended to act between the housing cavity 10 and the cutter 11 so as to push the cutter 11 in a direction having at least one radial component facing outwards.
  • the elastic means in question comprise an elastically deformable sheet element, 21, arranged at the bottom wall 5 of the housing cavity 10.
  • Such an elastically deformable sheet element 21 is located underneath the cutter 11, according to an arrangement which allows a relative bending portion, 21a, to remain cantilevered underneath a bottom surface of the cutter 11. Thereby, when the cutter 11 is in the working position, the bending portion 21a is bent downwards underneath it, thereby exerting an action which tends to push the cutter 11 radially outwards.
  • an elastically deformable sheet element 21 in fact facilitates the extraction of the cutter 11 from the housing cavity 10 when the clamping screw 13 is removed.
  • the elastically deformable sheet element 21 is provided with at least one hole, 22, required for the passage of at least one fastening element, 23, suitable for fastening the sheet element itself on a support block, 24, included at the bottom wall 5 of the housing cavity 10.
  • the support block 24 allows to keep the elastically deformable sheet element 21 in an elevated position with respect to the bottom wall 5, allowing the elastic deformation of the bending portion 21a positioned below the cutter 11.
  • the elastically deformable sheet element 21 is made of harmonic steel and has a thickness of about 0.2 mm, this does not preclude the choice of another material with the appropriate elastic properties or other shape.
  • the support block 24, the elastically deformable sheet element 21 and the fastening element 23, inserted inside a special second hole, 45, as seen in Fig. 2 , are included underneath the clamping block 12.
  • a special second hole, 45 as seen in Fig. 2
  • the device according to the invention comprises an anti-slip assembly, 40, intended to stabilize the clamping block 12 in the steps of unscrewing and extracting the clamping screw 13.
  • the anti-slip assembly 40 is housed below the shallower portion 3 of the housing cavity 10 and comprises an anti-slip pin, 41, housed within a further relative hole, 46, a spring element, 42, and a stop element, 43, with such an anti-slip pin 41 and spring element 42 inserted within a hole, 44, coaxial to the calibrated portion 33 of the side hole 30.
  • a spring element 42 is interposed between the stop element 43 and the anti-slip pin 41 and is intended to keep the anti-slip pin 41 in abutment on the clamping screw 13.
  • the anti-slip pin 41 is induced to insert in the threaded hole 25 of the clamping block 12 following the unscrewing of the clamping screw 13, so as to prevent the radial movement of the clamping block even in the absence of the clamping screw 13, consequently stabilizing it.
  • the length of the anti-slip pin 41 and the extension of the spring element 42 are suitably calibrated so as to ensure that the anti-slip pin 41, engaging the clamping block 12 following the extraction of the clamping screw 13, does not intercept the cutter 11, thus allowing its free extraction.
  • the arrangement of the anti-slip assembly 40 as described facilitates and significantly speeds up the operations of replacing the cutter 11. It is clear that the extraction of the cutter 11 does not require the disassembly and removal of the elements associated therewith, in fact speeding up maintenance operations.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Details Of Cutting Devices (AREA)
EP22170218.6A 2021-04-27 2022-04-27 Schneidkopf für eine maschine zur spanabhebenden bearbeitung von materialien Pending EP4082734A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202100010565 2021-04-27

Publications (1)

Publication Number Publication Date
EP4082734A1 true EP4082734A1 (de) 2022-11-02

Family

ID=76921184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22170218.6A Pending EP4082734A1 (de) 2021-04-27 2022-04-27 Schneidkopf für eine maschine zur spanabhebenden bearbeitung von materialien

Country Status (1)

Country Link
EP (1) EP4082734A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1174045B (de) * 1958-09-23 1964-07-16 Paul Kirsten Dr Ing Zylindrischer oder konischer Werkzeugtraeger fuer Holzbearbeitungsmaschinen, insbesondere Holzzerspannungsmaschinen
EP1574307A2 (de) 2004-03-09 2005-09-14 STARK S.p.A. Hobelwerkzeug
US20170291322A1 (en) 2014-10-10 2017-10-12 Leitz Gmbh & Co. Kg Cutter head for cutting materials, and cutter therefor
EP3305489A1 (de) * 2016-10-10 2018-04-11 Oertli Werkzeuge AG Messerkopf und messerkopfsystem

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1174045B (de) * 1958-09-23 1964-07-16 Paul Kirsten Dr Ing Zylindrischer oder konischer Werkzeugtraeger fuer Holzbearbeitungsmaschinen, insbesondere Holzzerspannungsmaschinen
EP1574307A2 (de) 2004-03-09 2005-09-14 STARK S.p.A. Hobelwerkzeug
US20170291322A1 (en) 2014-10-10 2017-10-12 Leitz Gmbh & Co. Kg Cutter head for cutting materials, and cutter therefor
EP3305489A1 (de) * 2016-10-10 2018-04-11 Oertli Werkzeuge AG Messerkopf und messerkopfsystem

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