EP0512275A2 - Outil de fraisage rotatif - Google Patents

Outil de fraisage rotatif Download PDF

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Publication number
EP0512275A2
EP0512275A2 EP92106192A EP92106192A EP0512275A2 EP 0512275 A2 EP0512275 A2 EP 0512275A2 EP 92106192 A EP92106192 A EP 92106192A EP 92106192 A EP92106192 A EP 92106192A EP 0512275 A2 EP0512275 A2 EP 0512275A2
Authority
EP
European Patent Office
Prior art keywords
rotation
cutting
tool
milling tool
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.)
Granted
Application number
EP92106192A
Other languages
German (de)
English (en)
Other versions
EP0512275B1 (fr
EP0512275A3 (en
Inventor
Hans Hundegger
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0512275A2 publication Critical patent/EP0512275A2/fr
Publication of EP0512275A3 publication Critical patent/EP0512275A3/de
Application granted granted Critical
Publication of EP0512275B1 publication Critical patent/EP0512275B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B27G13/08—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
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/10—Measures preventing splintering of sawn portions of wood

Definitions

  • the invention relates to a rotating milling tool for woodworking machines which preferably carry exchangeable cutting knives on the tool body on the circumference, which protrude a small radial dimension above the tool body and are oriented with their cutting edge in the cutting direction.
  • the invention further relates to a method for processing wooden workpieces with such a milling tool and a control device for performing the method.
  • Rotating milling tools of the type specified above are generally known. They are used, for example, for tying of wooden beams or other wooden workpieces.
  • the milling tools can be used to precisely machine one end of a beam.
  • the cutting knives are adapted to the direction of rotation, that is to say that their cutting edge is directed in the direction of rotation, and that, as a rule, a recess is arranged on the circumference in front of the cutting edge as a chip breaker, means that the engagement of the milling tool on the workpiece is always under certain conditions given conditions. If, for example, such a tool just cuts one end of the beam and if the same tool is also to machine the other end of the same beam, the beam being displaced in its longitudinal direction in a suitable path, then it follows that in one case the chips for example, exit downwards while the chips are thrown upwards when processing the other end of the beam.
  • a beam end is to be machined exactly, it must be prevented that splinters are torn out by the milling tool at the end of the machining process.
  • This can prevent, for example, the use of a so-called splinter wood that supports the beam on the relevant side and prevents splinters from being torn out.
  • this presupposes that the milling tool has a corresponding direction of rotation, for example when the splinter wood is under the beam, working from top to bottom, but not from bottom to top.
  • the invention is based on the milling tool of the type specified at the outset. According to the invention, it is proposed that part of the cutting edges of the cutting knives be assigned to one direction of rotation of the tool body and the other part to the opposite direction of rotation, with all cutting edges being at the same distance from the axis of rotation.
  • the invention provides a surprisingly simple solution.
  • a plurality of cutting edges are arranged on the tool body, of which one cutting edge points in one direction of rotation and the other cutting edges point in the other direction of rotation.
  • the cutting body has a cutting edge for one direction of rotation and another cutting edge for the other direction of rotation.
  • a larger number of suitable cutting knives will be provided on the cutting body.
  • the surprising result of the arrangement according to the invention apparently comes from the fact that during the cutting process, due to the flexibility of the material wood, the milling depth is somewhat greater than it would correspond to the theoretical path of the cutting edge in question.
  • the cutting edge apparently pulls up the chip and the wooden parts adjacent to the chip. After the chip has been lifted off, the uncut wood shrinks back so that it does not come into contact with the subsequent "non-cutting" cutting edge.
  • the milling tool With the milling tool according to the invention, it is now possible to adapt the direction of rotation of the milling tool to the respective requirements by simply reversing the drive motor. It is possible that the chips are always carried out in the same direction. Depending on the machining process, the milling tool can perform milling work both on the feed and on the return stroke without reducing the quality of the machined surfaces.
  • a symmetrically designed cutting tool is used which has cutting on both sides in the circumferential direction.
  • the manufacturing outlay for a milling tool according to the invention therefore does not have to be increased.
  • the cutting knives using the invention may preferably have a wedge or trapezoidal shape.
  • the invention can also be implemented using previously known sheet-like cutting knives.
  • a wedge-shaped or trapezoidal holding element is used which fixes the sheet-like cutting knives on both sides.
  • This pre-cutter has the task, for example, of processing the lateral limitation of the gradation when producing a gradation.
  • the invention is primarily applicable to those tool bodies which have a substantially cylindrical shape and the cutting knives are arranged on the cylindrical surface of the tool body.
  • the invention is not restricted to such shapes of tool bodies.
  • the tool body can also have a conical shape, for example, if this appears necessary or expedient for special machining purposes.
  • the cutting knives are then arranged in the conical surface.
  • the invention can also be used when the cutting edges are arranged in the conical or even end face of a rotating tool body.
  • the invention further proposes a method for machining a wooden workpiece in woodworking machines with a rotating milling tool with cutting edges which are assigned to opposite directions of rotation and wherein the workpiece and the tool are moved relative to one another. It has been found that it is very advantageous to proceed in such a way that the workpiece machining is started with a direction of rotation of the tool in which the cutting edges are directed against the beginning of the cut, and that after the beginning of the cut the direction of rotation of the milling tool is reversed becomes.
  • the milling tool always has the correct direction of rotation, ie a direction of rotation in which the cutting edges of the milling tool are directed against the workpiece are, so that the otherwise tearing chips are pressed against the workpiece, so that tearing is avoided. It is favorable in the method according to the invention if the relative movement between the workpiece and the tool is stopped, that the relative movement takes place to a small extent in the opposite direction and that the milling tool is then reversed in the other direction of rotation and finally the relative movement in the original direction is continued. The milling tool is stopped for the purpose of reversal without affecting the workpiece.
  • the direction of rotation is reversed when the axis of rotation of the milling tool has passed the plane of the beginning of the cut during the relative movement. In general, it is advisable to reverse the direction of rotation approximately in the middle of the cutting process.
  • the invention proposes a control device for performing the method.
  • a common automatic control is provided which controls the drive motor of the milling tool and the drives of the relative movement.
  • Such an automatic control can be easily implemented, especially since woodworking machines of the type described are generally provided with controls, from which the control sequence according to the invention can then be carried out.
  • the tool body 6 with the axis of rotation 7 in the exemplary embodiment in FIG. 1 has a plurality of cutting knives 3 on the circumference 12, which in particular have a trapezoidal shape.
  • These cutting knives 3 can be fastened, for example, by screws (not shown in more detail in FIG. 1) which engage radially from the outside inward in the tool body 6 and hold the cutting knives 3 in place.
  • the cutting knife 3 has the cutting edges 1 and 2.
  • the tool body has recesses 13 and 14 which serve to break the chips and to allow the chips to slide off the cutting edges.
  • the recess 13 cooperates with the cutting edge 1 and the Recess 14 with the cutting edge 2.
  • the axis of rotation of the tool body 6 is designated 7.
  • a pre-cutter can be arranged on the end face 9 of the tool body 6.
  • a trapezoidal holding element 8 is provided, which is held in the tool body 6 by a screw 17.
  • the holding element 8 holds sheet-like cutting knives 4 and 5, which are secured by pins 18.
  • the cutting edges of the cutting knives 4 and 5 are designated 1 and 2 and, as in the exemplary embodiment according to FIG. 1, interact with the recesses 13 and 14, respectively.
  • the roughing cutter 10 has the cutting edges 11, to which recesses 19 are also assigned.
  • the axial length of the cutting knife can be chosen freely. In some cases it is advisable to provide a single cutting knife over the entire length of the milling tool body. In some cases, however, it is better to use a plurality of knives that are offset from one another.
  • Fig. 3 shows a view of the end of the to be machined Workpiece 21.
  • a tenon is to be milled onto this workpiece by means of the milling tool 20, which rotates about the axis 7.
  • the tool 20 consists of the two tool parts 24 and 25 (see FIG. 7). The distance between these two tool parts corresponds to the width of the pin 30 which is to be milled out of the workpiece 21.
  • the parts 24 and 25 of the tool 20 have a configuration such as that shown in FIGS. 1 or 2.
  • the relative movement between the tool 20 and the workpiece 21 takes place in such a way that the tool is guided in a slide and this slide is designed to be displaceable.
  • the workpiece 21 is firmly clamped.
  • the tool can also be relatively stationary while the workpiece is being moved.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Milling, Drilling, And Turning Of Wood (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
EP92106192A 1991-05-08 1992-04-10 Outil de fraisage rotatif Expired - Lifetime EP0512275B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4115095A DE4115095A1 (de) 1991-05-08 1991-05-08 Rotierendes fraeswerkzeug
DE4115095 1991-05-08

Publications (3)

Publication Number Publication Date
EP0512275A2 true EP0512275A2 (fr) 1992-11-11
EP0512275A3 EP0512275A3 (en) 1993-03-03
EP0512275B1 EP0512275B1 (fr) 1996-09-25

Family

ID=6431288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106192A Expired - Lifetime EP0512275B1 (fr) 1991-05-08 1992-04-10 Outil de fraisage rotatif

Country Status (3)

Country Link
EP (1) EP0512275B1 (fr)
AT (1) ATE143303T1 (fr)
DE (2) DE4115095A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818151A1 (fr) * 2006-02-08 2007-08-15 Blastrac B.V. Fraise rotative réversible

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009203A1 (de) 2006-02-24 2007-08-30 Arntz Beteiligungs Gmbh & Co. Kg Rotierend antreibbares Schneid- bzw. Fräswerkzeug zum Bearbeiten zäher, elastischer oder platischer Materialien
DE102014008645B4 (de) 2014-06-13 2018-07-19 Audi Ag Stirnfräswerkzeug

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE117551C (fr) * 1900-01-01
GB191009820A (en) * 1910-04-22 1910-10-06 John Elsworth And Sons Ltd Improvements in Cutter-holders for Wood-working Machinery.
DE480625C (de) * 1929-08-06 Ernst Mehring Fuer Rechts- und Linksdrehung verwendbarer Fraeser fuer Holzbearbeitung
DE824257C (de) * 1950-08-18 1951-12-10 Friedrich Grupp Vorschneider, insbesondere fuer Fraeswerkzeuge
US2840128A (en) * 1957-05-10 1958-06-24 George L Slusser Reversible action cutting bit assembly
AT249980B (de) * 1964-06-01 1966-10-25 Josef Ing Reinberg Vorrichtung zur Kantenbearbeitung von Holzteilen mittels Fräswerkzeugen
US3672417A (en) * 1970-05-12 1972-06-27 Roberto Lugo Combination shaper blade and support therefor
SU1524999A1 (ru) * 1988-03-23 1989-11-30 Львовский Лесотехнический Институт Дереворежуща фреза
DE9016128U1 (de) * 1990-05-23 1991-03-21 Bacci Paolino, Cascina, Pisa Werkzeugmaschine zur Herstellung von Verbindungen an Konstruktionselementen von Möbeln o.dgl.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE117551C (fr) * 1900-01-01
DE480625C (de) * 1929-08-06 Ernst Mehring Fuer Rechts- und Linksdrehung verwendbarer Fraeser fuer Holzbearbeitung
GB191009820A (en) * 1910-04-22 1910-10-06 John Elsworth And Sons Ltd Improvements in Cutter-holders for Wood-working Machinery.
DE824257C (de) * 1950-08-18 1951-12-10 Friedrich Grupp Vorschneider, insbesondere fuer Fraeswerkzeuge
US2840128A (en) * 1957-05-10 1958-06-24 George L Slusser Reversible action cutting bit assembly
AT249980B (de) * 1964-06-01 1966-10-25 Josef Ing Reinberg Vorrichtung zur Kantenbearbeitung von Holzteilen mittels Fräswerkzeugen
US3672417A (en) * 1970-05-12 1972-06-27 Roberto Lugo Combination shaper blade and support therefor
SU1524999A1 (ru) * 1988-03-23 1989-11-30 Львовский Лесотехнический Институт Дереворежуща фреза
DE9016128U1 (de) * 1990-05-23 1991-03-21 Bacci Paolino, Cascina, Pisa Werkzeugmaschine zur Herstellung von Verbindungen an Konstruktionselementen von Möbeln o.dgl.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET PATENTS ABSTRACTS Section PQ, Week 9037, 24. Oktober 1990 Derwent Publications Ltd., London, GB; Class P63, AN 90-280925/37 & SU-A1-1 524 999 (URALS FORESTRY INST) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1818151A1 (fr) * 2006-02-08 2007-08-15 Blastrac B.V. Fraise rotative réversible

Also Published As

Publication number Publication date
ATE143303T1 (de) 1996-10-15
EP0512275B1 (fr) 1996-09-25
DE59207219D1 (de) 1996-10-31
EP0512275A3 (en) 1993-03-03
DE4115095A1 (de) 1992-11-12

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