EP1726416A1 - Werkzeug zur Bearbeitung von Holz und Holzwerkstoffen, sowie dessen Herstellungsverfahren - Google Patents

Werkzeug zur Bearbeitung von Holz und Holzwerkstoffen, sowie dessen Herstellungsverfahren Download PDF

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Publication number
EP1726416A1
EP1726416A1 EP06114172A EP06114172A EP1726416A1 EP 1726416 A1 EP1726416 A1 EP 1726416A1 EP 06114172 A EP06114172 A EP 06114172A EP 06114172 A EP06114172 A EP 06114172A EP 1726416 A1 EP1726416 A1 EP 1726416A1
Authority
EP
European Patent Office
Prior art keywords
cutting blade
angle
cutting
recovery
tool
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.)
Granted
Application number
EP06114172A
Other languages
English (en)
French (fr)
Other versions
EP1726416B1 (de
EP1726416B8 (de
Inventor
Stefano Elia
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.)
Pozzo SpA
Original Assignee
Pozzo SpA
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Publication date
Application filed by Pozzo SpA filed Critical Pozzo SpA
Priority to PL06114172T priority Critical patent/PL1726416T3/pl
Publication of EP1726416A1 publication Critical patent/EP1726416A1/de
Publication of EP1726416B1 publication Critical patent/EP1726416B1/de
Application granted granted Critical
Publication of EP1726416B8 publication Critical patent/EP1726416B8/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B27G13/12—Cutter blocks; Other rotary cutting tools for profile cutting

Definitions

  • the present invention concerns a tool, such as for example a miller or suchlike, for working wood and its derivatives.
  • the tool comprises a support element, or body, substantially cylindrical in shape, with which two or more cutting blades are radially associated, and clamping devices to clamp the latter to the body of the tool.
  • each clamping device is able to maintain the nominal cutting diameter of the tool constant, even with cutting blades having different shapes and cutting diameters, after any sharpening operation.
  • tools for working wood and its derivatives normally comprise a support element or body of the tool, provided radially with a plurality of housing seatings inside which an equal number of cutting blades are disposed.
  • each cutting blade rests on a fixed shoulder made in the seating, and made so as to contrast the force imparted on the cutting edge by the working.
  • a thrust element called wedge In each of the seatings a thrust element called wedge is normally mounted; thrust by a threaded grub screw, or drawn by a screw pressing on a plane rear surface of the blade, it acts against a bottom surface and a plane front surface of the cutting blade, keeping the latter positioned inside the relative seating.
  • Each cutting blade also has an upper surface, or back, shaped and inclined by a determinate upper rake angle ⁇ , so as to define the cutting profile of the blade.
  • the front surface and the back of the blade form a cutting angle ⁇ , normally less than 90° and defining a cutting edge of the blade, by means of which the chip is removed.
  • the radius of the support element that passes through the cutting edge of the blade defines with the front surface a mordant angle ⁇ .
  • Cutting blades are sharpened by removing material from the front surface of the blade, so as to restore the cutting edge, maintaining unchanged the cutting angle ⁇ . This operation, however, entails a reduction in the height of the blade, with a consequent proportional reduction in the cutting diameter of the tool, and a variation in the mordant angle ⁇ .
  • the calculated recovery angle ⁇ does not allow to recover all the diameters correctly, since the mordant angle ⁇ varies, after sharpening, differently for every diameter, and therefore not uniformly, thus entailing a progressive loss of precision of the tool.
  • a tool for working wood is also known, from the US patent US-A-4,541,756 , having a bottom surface resting directly on the bottom wall of the seating, and inclined parallel to the upper surface, or back, of the tool, so as to define a cross section substantially like a parallelogram.
  • the tool is kept with its front surface against a relative support element by means of a screw disposed passing through the tool, screwed onto the support element, and acting on the plane rear surface of the tool.
  • shaped cutting blades also have inclined lateral surfaces with lateral rake angles ⁇ , which define the lateral segments of the cutting profile which go from one diameter to the other.
  • both the solution shown in US-A-4,541,756 and also the other known solutions, also entail a progressive error in the axial repositioning of the cutting profile, that is, along an axis parallel to the axis of rotation of the tool, causing differences in the shapings made on the pieces of wood, before and after sharpening.
  • One purpose of the present invention is to achieve a tool for working wood and its derivatives which, after the usual operations to sharpen the cutting blades, allows to maintain all the expected nominal diameters precisely constant, and to axially reposition the shaped cutting profile exactly in the original position, so that there are no variations in the shaping made on the wood, before and after sharpening.
  • Another purpose of the present invention is to achieve a tool which allows to recover with precision the positioning and nominal diameters of the cutting blades after they have been sharpened, even if their disposition is provided with an axial angle ⁇ .
  • the Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.
  • a tool for working wood and its derivatives comprises at least a support element, substantially cylindrical and provided peripherally with a plurality of radial housing seatings, each able to house a cutting blade and associated clamping means.
  • Each of the radial housing seatings comprises a reference surface against which the clamping means keeps the cutting blade clamped, and recovery means inclined by a recovery angle ⁇ with respect to the reference surface, such as for example an inclined bottom surface, a lateral tongue, a guide pin, and with respect to which the clamping means is able to slide after the operations to sharpen the cutting blade.
  • the cutting blade comprises at least an inclined upper surface and defining a determinate cutting profile with at least an upper rake angle ⁇ .
  • the upper rake angle ⁇ is variable along the cutting profile, according to each nominal cutting diameter of the tool, the recovery angle ⁇ and each mordant angle ⁇ formed between the cutting blade and a radius R of the support element passing through the cutting profile.
  • the rake angle ⁇ is in any case variable along the cutting profile, according to each mordant angle ⁇ , thus allowing to restore the cutting diameter along all the cutting profile with a constant recovery angle ⁇ .
  • the clamping means is conformed so as to keep the cutting blade clamped with a plane rear surface against the reference surface of the radial housing seatings, which gives the advantage of a wide contact surface between the blade and the tool body, so that the forces imparted by the working process on the cutting edge are discharged to a large extent onto the tool body, rather than transforming into shearing forces on the cutting edge, as happens, on the contrary, in the embodiment described in US-A-4,541,756 .
  • the cutting blade also comprises at least a lateral surface adjacent to the upper surface, inclined by a determinate lateral rake angle ⁇ and defining a lateral segment of the cutting profile.
  • the cutting blade also comprises at least a recovery surface inclined by a lateral recovery angle ⁇ lat substantially equivalent to the lateral rake angle ⁇ , and able to rest against an abutment surface of the radial housing seating.
  • an axial displacement is determined of the cutting blade with respect to the previous position, that is, along an axis substantially parallel to the axis of rotation of the support element.
  • the axial displacement of the cutting blade is substantially equivalent to the reduction in the lateral surface of the cutting blade itself due to the sharpening, so that the original axial positioning of the cutting blade can be restored, and there are no differences in shaping on the wood worked, before and after the cutting blades have been sharpened.
  • a tool 10 for working wood comprises a support element 11, substantially cylindrical, rotary around an axis of rotation X and provided peripherally with a plurality of housing seatings 12, in this case three, equal to each other and able to house inside them a cutting blade 15 and a corresponding clamping device 16.
  • Each clamping device 16 comprises a thrust element 19 associated with an attachment grub screw 17, to attach the cutting blade 15 inside the respective housing seating 12.
  • Each cutting blade 15 comprises a shaped cutting profile 30, by means of which the chip is removed, a plane surface 25, a front surface 26, substantially parallel to the plane surface 25, a bottom surface 27 which connects below the plane surface 25 to the front surface 26, and two upper surfaces, or backs 29, in this case substantially horizontal, and each shaped with a determinate upper rake angle ⁇ 1, ⁇ 2.
  • Each upper back 29 is inclined with respect to the front surface 26 by a determinate angle ⁇ , or cutting angle of the blade 15.
  • the cutting profile 30 is sharpened by means of removing a thickness sp of material from the front surface 26 of the cutting blade 15, so as not to vary the cutting angle ⁇ , but reducing the height of the cutting tool 15.
  • the cutting profile 30 has a first nominal cutting diameter D1 and a second nominal cutting diameter D2, smaller than the first.
  • the cutting blade 15 is provided with a surface, or lateral back 13, to connect the two diameters D1 and D2, shaped with a determinate lateral rake angle ⁇ .
  • the lateral back 13 is adjacent to the upper backs 29.
  • the cutting profile 30 is defined by the intersection edge between the backs 29 and the back 13, with the front surface 26 of the cutting blade 15.
  • each cutting blade 15 is inclined by a mordant angle ⁇ 1, ⁇ 2 with respect to a radius R of the support element 11, passing through the cutting profile 30.
  • the mordant angle ⁇ 1, ⁇ 2 is different along the cutting profile 30, according to the nominal cutting diameter D1, D2.
  • the cutting blade 15 has a substantially square cutting profile 30 and therefore the upper 29 and lateral 13 backs define different segments with relative upper ⁇ 1, ⁇ 2 and lateral ⁇ rake angles.
  • the upper 29 and lateral 13 backs and the relative upper ⁇ 1, ⁇ 2 and lateral ⁇ rake angles are interpolated so as to give continuity to the shaping curve defined by the cutting profile 30.
  • Each cutting blade 15 also comprises a recovery surface 24 which laterally connects the plane surface 25 to the front surface 26, and which is kept by the clamping device 16 in contact with an abutment surface 23 of the housing seating 12.
  • the recovery surface 24 is inclined with respect to the front surface 26 by a lateral recovery angle ⁇ lat substantially equivalent to the lateral rake angle ⁇ of the lateral back 13, so that after the removal of the thickness sp during sharpening, the cutting blade 15 is subjected, once repositioned in the housing seating 12, to an axial displacement ⁇ j along an axis substantially parallel to the axis of rotation X of the support element 11.
  • the axial displacement ⁇ j allows to recover axially the positioning of the cutting profile 30 after sharpening of the cutting blade 15, so that there is uniformity of shaping of the wood worked before and after the sharpening of the cutting blades 15.
  • Each housing seating 12 comprises a bottom surface 21, a reference surface 22 and the abutment surface 23, which is substantially orthogonal to the axis of rotation X of the support element 11.
  • the bottom surface 21 forms, as known for example from the European patent application EP-A-1.418.031 in the name of the Applicant, an obtuse angle with the reference surface 22.
  • the amplitude of this obtuse angle is greater than 90° by a determinate recovery angle ⁇ .
  • the method to produce the tool 10 provides at least a calculation step in which the upper ⁇ 1, ⁇ 2 and lateral ⁇ rake angles are calculated so as to be variable along the cutting profile 30 according to each nominal diameter D1 or D2 of the recovery angle ⁇ and of each mordant angle ⁇ 1, ⁇ 2 of the cutting blade 15.
  • the step to calculate the upper rake angle ⁇ 1 provides the following substeps.
  • the upper rake angle ⁇ 2 is calculated, according to the diameter D2, the recovery angle ⁇ and the mordant angle ⁇ 2, and the lateral rake angle ⁇ of the lateral back 13.
  • these calculations to obtain the upper ⁇ 1, ⁇ 2 and, possibly, lateral ⁇ rake angles are effected automatically by a profiling machine which produces the cutting blade 15.
  • a positioning seating 31 provided with an inner surface 32 inclined with respect to the front surface 26 of the lateral recovery angle ⁇ lat , which is kept by the clamping device 16, in cooperation with a fixed abutment element 33, disposed transverse inside the housing seating 12, such as for example a pin 34, a screw or other.
  • a threaded screw stud may be provided, having the longitudinal axis substantially parallel to the front surface 26 of the cutting blade 15, and provided with a wedge profile, or ogive, by means of which pressure can be exerted on the thrust element 19 in order to take the cutting blade 15 against the reference surface 22, and keep the recovery surface 24 against the abutment surface 23 and possibly the inner surface 32 against the abutment element 33.
  • the positioning seating 31 is made open on one side in correspondence with the recovery surface 24.
  • a guide element such as for example a lateral tongue, a pin or suchlike, inclined by the recovery angle ⁇ with respect to the reference surface 22, and able to guide the thrust element 19 and/or the cutting blade 15 during the steps of radial recovery of the value ⁇ h.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Manufacture Of Wood Veneers (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
  • Turning (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP06114172A 2005-05-20 2006-05-18 Werkzeug zur Bearbeitung von Holz und Holzwerkstoffen, sowie dessen Herstellungsverfahren Active EP1726416B8 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06114172T PL1726416T3 (pl) 2005-05-20 2006-05-18 Narzędzie do obróbki drewna i jego pochodnych, i sposób wytwarzania tego narzędzia

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000083A ITUD20050083A1 (it) 2005-05-20 2005-05-20 Utensile per la lavorazione del legno e dei suoi derivati, e procedimento per la sua realizzazione

Publications (3)

Publication Number Publication Date
EP1726416A1 true EP1726416A1 (de) 2006-11-29
EP1726416B1 EP1726416B1 (de) 2009-07-08
EP1726416B8 EP1726416B8 (de) 2009-08-19

Family

ID=35796041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114172A Active EP1726416B8 (de) 2005-05-20 2006-05-18 Werkzeug zur Bearbeitung von Holz und Holzwerkstoffen, sowie dessen Herstellungsverfahren

Country Status (6)

Country Link
EP (1) EP1726416B8 (de)
AT (1) ATE435728T1 (de)
DE (1) DE602006007642D1 (de)
ES (1) ES2329501T3 (de)
IT (1) ITUD20050083A1 (de)
PL (1) PL1726416T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014003962U1 (de) 2014-05-13 2014-06-11 Robert Bosch Gmbh Werkzeug

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541756A (en) * 1981-10-01 1985-09-17 Masao Kubota Revolving cutting tool
EP1418031A2 (de) * 2002-11-06 2004-05-12 Pozzo SpA Werkzeug zur Bearbeitung von Holz und Abkömmlingen davon

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541756A (en) * 1981-10-01 1985-09-17 Masao Kubota Revolving cutting tool
EP1418031A2 (de) * 2002-11-06 2004-05-12 Pozzo SpA Werkzeug zur Bearbeitung von Holz und Abkömmlingen davon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014003962U1 (de) 2014-05-13 2014-06-11 Robert Bosch Gmbh Werkzeug
RU2696971C2 (ru) * 2014-05-13 2019-08-07 Роберт Бош Гмбх Инструмент

Also Published As

Publication number Publication date
DE602006007642D1 (de) 2009-08-20
PL1726416T3 (pl) 2009-12-31
ES2329501T3 (es) 2009-11-26
ATE435728T1 (de) 2009-07-15
EP1726416B1 (de) 2009-07-08
EP1726416B8 (de) 2009-08-19
ITUD20050083A1 (it) 2006-11-21

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