EP2097200A1 - Fraise à queue avec différents tranchants - Google Patents

Fraise à queue avec différents tranchants

Info

Publication number
EP2097200A1
EP2097200A1 EP07847382A EP07847382A EP2097200A1 EP 2097200 A1 EP2097200 A1 EP 2097200A1 EP 07847382 A EP07847382 A EP 07847382A EP 07847382 A EP07847382 A EP 07847382A EP 2097200 A1 EP2097200 A1 EP 2097200A1
Authority
EP
European Patent Office
Prior art keywords
cutting edge
radius
cutting
axis
milling cutter
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Withdrawn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
EP07847382A
Other languages
German (de)
English (en)
Inventor
Josef Giessler
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.)
Sandvik Intellectual Property AB
Original Assignee
Sandvik Intellectual Property AB
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 Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Publication of EP2097200A1 publication Critical patent/EP2097200A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/086—Discontinuous or interrupted cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/28—Arrangement of teeth
    • B23C2210/287—Cutting edges arranged at different axial positions or having different lengths in the axial direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/32—Details of teeth
    • B23C2210/325—Different teeth, i.e. one tooth having a different configuration to a tooth on the opposite side of the flute
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/54—Configuration of the cutting part
    • 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
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1946—Face or end mill
    • 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
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1952—Having peripherally spaced teeth
    • Y10T407/1962—Specified tooth shape or spacing

Definitions

  • the present invention relates to an end mill with a plurality of end cutting edges, of which at least one first extends to the axis of the milling cutter, according to the preamble of claim 1.
  • end mills which are also referred to as face milling
  • the end cutting serve to produce a more or less smooth surface in the normal feed movement of the end mill during operation, which is perpendicular to the axis, on the front side of the cutter facing side of the workpiece.
  • End millers or face milling cutters in which at least one cutting edge extends into the center or to the axis of the milling cutter can, within certain limits, also be moved into a workpiece with an axial feed or a combined axial and lateral feed.
  • the axial feed movement is usually reserved to drills having specially designed for this axial feed movement cutting, whereas the end cutting an end mill serve primarily to smooth the remaining under the frontal cutting surfaces during the normal horizontal feed movement of the milling cutter.
  • the present invention has the object to provide an end mill, which allows significantly higher axial feed movements and yet leaves in the normal lateral (perpendicular to the axis) advancing movement of the milling cutter on its face relatively smooth surfaces.
  • the cutter has at least one further, different from the first end cutting second cutting edge, wherein the axial position and shape of the first cutting edge and also the second cutting edge is provided such that in a axial dipping of the rotary cutter into a workpiece within a radially inner region from the axis of the cutter to a first radius ⁇ intersects only the first cutting edge, wherein the radius r, is smaller than the nominal radius of the end mill, and that in a second, radially adjoining area only the second cutting intersects, between the radially inner radius r, and a larger radius r a, the maximum may take the value of the nominal radius R of the milling cutter.
  • This division of work areas for the first cutting edge and the second cutting edge makes it possible to design the first cutting edge primarily for an effective axial feed movement, while the second cutting edge should not obstruct an axial feed movement as far as possible, but at the same time a lateral feed motion as possible should produce smooth surface on the workpiece, this operation is again not hindered or impaired by the first cutting edge and even supported according to preferred embodiments.
  • the outer radius r a to which the second cutting edge alone cuts in the radial direction is smaller than the nominal radius R of the milling cutter, the range between the radius r a and the nominal radius R during axial dipping of the milling cutter is machined into a workpiece substantially equally by both cutting edges.
  • the radially outer portions of the first and second cutting edges are at the same time the axially most projecting cutting portions and are nearly perpendicular to the axis or at an angle slightly different from the 90 ° angle to the axis.
  • These cutting sections can also have a slight curvature whose radius corresponds at least approximately to the nominal radius of the milling cutter.
  • the radially inner cutting portions may have a greater inclination relative to a plane perpendicular to the cutter axis and in particular also with be projecting tips which are in the axial direction either just as far as the radially outer edge portions or against these radially outer regions only slightly, ie, typically less than 1 mm, axially set back.
  • At least one further first cutting edge is arranged symmetrically with respect to the cutter axis relative to the first cutting edge.
  • the first cutting edges are identical to one another and offset from one another only in the circumferential direction, the angular distances resulting from a full circle divided by the number of first cutting edges.
  • Yet another embodiment of the invention provides for a plurality of second cutters, which in turn are symmetrical, i. are arranged at mutually equal angular intervals to the cutter axis.
  • first cutting edges and second cutting edges are the same, in which case, according to a further embodiment, the first cutting edges and the second cutting edges are arranged alternately in the circumferential direction of the milling cutter.
  • the angular distances between the immediately consecutive cutting edges may vary, i. H. the alternating first and second cutting edges have different angular distances from adjacent cutting edges, respectively, wherein, viewed in the direction of rotation, the angle from one first cutting edge to the next second cutting edge is greater than the angle from this second cutting edge to the next following first cutting edge.
  • the second cutting edges in the center of the milling cutter are sharpened within an inner radius r 4 , so that in the sharpened region of the second cutting edges, only the first cutting edges can cut material in the case of an axial feed.
  • the first cutting edges may, according to one embodiment of the invention, be composed of a plurality of sections which include different positive or negative angles with a perpendicular to the cutter axis.
  • the first cutting edge starting from the axis of the milling cutter, has the following course:
  • a first section is angled forwards, correspondingly encloses a negative angle ⁇ i with a plane perpendicular to the axis and extends in the radial direction up to a radius rv.
  • a second section adjoining this first section is in axial direction - -
  • the second section extends between the radii ri and r 2 .
  • a third section, which adjoins the second section in the radial direction, again encloses a negative angle 0 3 with the plane perpendicular to the axis, this section extending from a radius r 2 to a radius r 3 which is at most equal to Nominal radius R of the cutter is, however, according to one embodiment, the radius r 3 is smaller than the nominal radius R, so that the first cutting edge according to this embodiment has an optional fourth outer portion extending from the radius r 3 to the nominal radius R and at most a small angle between + 2 ° and -2 ° with the plane perpendicular to the axis.
  • the second cutting edge is, as already mentioned, according to an embodiment of the invention, pointed up to an inner radius r 4 and thus begins at the radius ⁇ , from where it extends to an outer radius r 5 which corresponds at most to the nominal radius R,
  • each optionally provided outer portions of the first cutting edge and the second cutting edge are at the same axial height, and they are also the axially most projecting portions of the first and second cutting edges.
  • the radial length and any curvature of the radially outer portions of the first and second cutting edges are suitably identical.
  • any inclination relative to a plane perpendicular to the cutter axis could be identical for the outer portions of the first and second blades, respectively, and the respective angles or radii of curvature of the radially outer portions of the first and second blades may also be slightly different.
  • the latter outer sections of the first and second cutting edges which also project furthest axially, generate the smooth workpiece surface facing the front side of the milling cutter during the lateral advancing movement of the milling cutter, and are thus effectively plane cutting.
  • the maximum lateral feed of the cutter per cutting edge should at most correspond to the radial length of these outer cutting edge sections.
  • the angle ⁇ 4 should be smaller than the angle ⁇ 3 in absolute terms, with the optional radially outer portion of the first blade being at the same axial height - -
  • Radially inner cutting portions which have a relatively greater inclination with respect to a plane perpendicular to the cutter axis, according to one embodiment are set back in the axial direction relative to radially outer cutting portions or at most reach the axial position of the outer portions, without protruding therefrom. This ensures that these inclined cutting portions have no adverse influence on the production of a smooth workpiece surface on the front side of the milling cutter.
  • such radially inner cutting portions which are inclined with respect to a plane perpendicular to the cutter axis compared to the outer portions, an inclination of a maximum of 30 °, preferably a maximum of 20 ° and a minimum of 5 °, optionally also at least a portion of the inner Cutting sections without appreciable inclination, d. H. parallel or less than 2 ° to this plane.
  • Radially inner cutting portions which have a relatively greater inclination with respect to a plane perpendicular to the cutter axis may optionally define at least one tip, which may optionally be rounded.
  • the tip formed by inner cutting portions which have a relatively greater inclination with respect to a plane perpendicular to the cutter axis is, according to one embodiment, less than 2 mm, preferably less than 1 mm and in particular between 0.1 and 0, in the axial direction compared to radially outer portions , 5 mm set back.
  • the optionally rounded tip is formed solely by cutting portions of the first cutting edge.
  • FIG. 2 shows a detail enlargement from FIG. 1 and FIG.
  • Figure 3 the cutting edge profile of the first and the second cutting, which are shown axially offset from each other in the figure.
  • a generally designated 100 end mill which consists of a clamping end or shaft 60 and a cutting part 50.
  • the cutting part is shown enlarged again in FIG. 2, so that details of this cutting part can be better recognized.
  • a cutting part 50 with a total of four cutting edges, two of which are first cutting edges 10 and two cutting second cutting 20, wherein the first cutting 10 are diametrically opposite each other in pairs and also the second cutting edges 20 in pairs diametrically opposite lie.
  • the adjacent to the cutting edges open spaces 1 1 and 21 are shown hatched, while lying in front of the cutting edges clamping surfaces 12 and 22 are not hatched, in this perspective view, only two of the clamping surfaces are visible and the cutting edges themselves each as a section lines of the open spaces 11 and 21 with the respective rake surfaces 12 and 22, respectively.
  • FIG. 3 shows the profile of the cutting edges 10 and 20 in a side view and sectional view, wherein the upper part of Figure 3 corresponds to an axial section through the cutter, which lies in the plane of the first cutting edge 10, while the lower part of Figure 3 shows a relation to the sectional plane of the upper part about 90 ° twisted axial section showing the two diametrically opposed second cutting edges 20.
  • the two sections are shown axially offset.
  • the position of a second cutting edge 20 in the projection on the first cutting edge 10 is also shown in broken lines in the upper part on the left side, so that it becomes clear that the two outer cutting edge portions 5 of the first cutting edge 10 and 15 of the second Cutting edge 20 coincide.
  • first cutting edge and second cutting edge each refer to one half of the cutting edges discernible at the top and bottom respectively, ie the first cutting edge begins at the center of an axis 30 of the milling cutter with a first cutting edge section 1, the definition chosen here is a negative angle ⁇ i with one to the axis 30 of the milling cutter vertical plane 40 includes. At this first radially inner portion 1 of the first blade 10 is followed by a second portion 2 of the first blade 10, which extends at a positive angle ⁇ 2 to the plane 40 inclined. Both cutting edge sections 1 and 2 together form a flat roof shape with a tip 7, which may optionally be rounded with a small radius.
  • a third section 3 of the first cutting edge 10 connects, which again inclined at a negative angle ⁇ 3 to the plane 40 and to the radially outer end of this section 3 still includes the radially outer portion 5 at which is inclined approximately parallel to the plane 40 or at a slight angle of less than ⁇ 2 ° relative to the plane 40 and which may also have a curvature, the corresponding radius of curvature being at least equal to the nominal radius R of the mill.
  • the second cutting edges 20 can be seen in the lower part of Figure 3, where these cutting axially offset from the first cutting edge are shown, but in fact are axially also in the first cutting, in such a way that the respective outer portions 5 or 15 are at the same axial height.
  • the second cutting edges 20 are in the center, ie in the vicinity of the axis 30 of the milling cutter, pointed. These Ausspitzitch 8 ensure that a sufficient chip space is available in front of the radially inner cutting edge portions 1 of the first cutting. Starting from the axis 30 of the milling cutter, the second cutting edge 20 only begins at a radius r "which corresponds approximately to the radial length ri of the first section 1 of the first cutting edge, but which may also be larger or slightly smaller. The radially outwardly extending first portion 14 of the second cutting edge 20 extends therefrom at a negative angle ⁇ 4 relative to the plane 40, which represents a plane perpendicular to the cutter axis 30.
  • section 14 extends axially in front of the section 3 and thus cuts or processes regions of the workpiece which can no longer be grasped by the section 3 of the first cutting edge 10, which recess is correspondingly axially offset.
  • dashed line 14, which represents the second cutting edge 20, in this projection intersects the second section 2 of the second cutting edge at a radius ri, measured from the axis 30 of the milling cutter.
  • the area a is machined exclusively by the cutting edges 1 and 2 approximately up to the radius ⁇ .
  • the cutting work is performed almost exclusively by the section 14 of the second cutting edge 20 and in the section 10, the cutting is effected equally by the outer cutting portions 5 of the first blade 10 and 15 of the second blade 20, respectively.
  • the axial positions and angles of inclination of the cutting edge sections 1 and 2 are dimensioned such that the tip 7 formed between these cutting sections, which may possibly be flattened or rounded, is set back slightly axially relative to the radially outer sections 5 and 15, typically by about a distance of not more than 2 mm, preferably less than 1 mm. This distance may be reduced to the value 0, but the tip 7 should not protrude axially from the outer portions 5, 15 as far as possible.
  • the two cutting edge portions 14 of the second cutting edges 20 are also arranged mirror-inverted or symmetrical to each other, so that also compensate for the engagement of these cutting edge portions with the workpiece in the radial direction acting on these blades reaction forces.
  • the first cutting edges have a cutting edge course, which in principle is modeled on the cutting edge profile of some drills, even if drill cutting edges with corresponding roof-shaped cutting edge progressions are generally not arranged symmetrically with respect to the axis of a drill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'invention concerne une fraise à queue avec plusieurs tranchants frontaux (10, 20) parmi lesquels au moins un premier tranchant (10) s'étend jusqu'à l'axe (30) de la fraise. L'invention vise à fournir une fraise à queue qui permette des mouvements d'avance axiale nettement plus importants tout en laissant des surfaces relativement lisses sur son côté frontal lors du mouvement normal d'avance latérale (perpendiculaire à l'axe) de la fraise. A cet effet, la fraise présente au moins un deuxième tranchant frontal (20), supplémentaire et différent du premier tranchant frontal (10). La position axiale et la conformation du premier tranchant (10) et du deuxième tranchant (20) sont prévues de telle sorte que, lors d'un enfoncement axial de la fraise rotative dans une pièce, dans une région radialement intérieure (a), la coupe s'effectue uniquement par le premier tranchant (10) depuis l'axe (30) de la fraise jusqu'à un premier rayon (ri) qui est inférieur au rayon nominal et supérieur à un rayon radialement intérieur du deuxième tranchant, et dans une deuxième région (b) qui se situe entre le rayon ri et un rayon plus grand ra qui peut prendre au maximum la valeur du rayon nominal (R) de la fraise, la coupe s'effectue uniquement par le deuxième tranchant (20).
EP07847382A 2006-12-08 2007-11-27 Fraise à queue avec différents tranchants Withdrawn EP2097200A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006058258A DE102006058258A1 (de) 2006-12-08 2006-12-08 Schaftfräser mit unterschiedlichen Schneiden
PCT/EP2007/062855 WO2008068158A1 (fr) 2006-12-08 2007-11-27 Fraise à queue avec différents tranchants

Publications (1)

Publication Number Publication Date
EP2097200A1 true EP2097200A1 (fr) 2009-09-09

Family

ID=39149215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07847382A Withdrawn EP2097200A1 (fr) 2006-12-08 2007-11-27 Fraise à queue avec différents tranchants

Country Status (5)

Country Link
US (1) US20100098504A1 (fr)
EP (1) EP2097200A1 (fr)
JP (1) JP2010511522A (fr)
DE (1) DE102006058258A1 (fr)
WO (1) WO2008068158A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2392095C1 (ru) * 2009-05-25 2010-06-20 Нина Алексеевна Корюкина Концевая фреза
JP5925250B2 (ja) 2014-07-07 2016-05-25 ユニオンツール株式会社 スクエアエンドミル
DE102016116279A1 (de) * 2016-08-31 2018-03-01 Datron Ag Einschneidiges Fräswerkzeug
DE102024116268A1 (de) * 2024-06-11 2025-12-11 Bayerische Motoren Werke Aktiengesellschaft Fräswerkzeug zum Bearbeiten von Werkstücken

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Publication number Priority date Publication date Assignee Title
US2202236A (en) * 1938-04-27 1940-05-28 Greenfield Tap & Die Corp Tap
DE1177904B (de) * 1960-10-11 1964-09-10 Hurth Masch Zahnrad Carl Bohrnutenfraeser
US3133339A (en) * 1961-07-10 1964-05-19 Weldon Tool Co Tool having improved cutting qualities
DE2808866C2 (de) * 1978-03-02 1982-10-07 Komet Stahlhalter- Und Werkzeugfabrik Robert Breuning Gmbh, 7122 Besigheim Bohrwerkzeug für Bohrungen in Metallvollmaterial
DE3209821A1 (de) * 1982-03-18 1983-09-22 Montanwerke Walter GmbH, 7400 Tübingen Wendeplattenfraeser
DE3713161C3 (de) * 1987-04-17 1994-07-28 Walter Ag Wendeschneidplatte für ein Bohrfräswerkzeug
JPH01135408A (ja) * 1987-11-20 1989-05-29 Mitsubishi Metal Corp サーメット製エンドミル
US6439811B1 (en) * 1994-05-06 2002-08-27 Lon J. Wardell End-mill tool with high and low flutes and related method for rough cutting and finishing a workpiece
US5467670A (en) * 1994-08-15 1995-11-21 General Motors Corporation Method of manufacture for rotary cutting tool
JPH11138324A (ja) * 1997-11-04 1999-05-25 Daishowa Seiki Co Ltd ミーリングカッタ
US6056485A (en) * 1998-09-01 2000-05-02 Kennametal Inc. Ramp plunge and feed milling cutter
US6939090B1 (en) * 1999-08-17 2005-09-06 Mitsubishi Materials Corporation Throwaway tip and throwaway-type cutting tool
FR2858947B1 (fr) * 2003-08-18 2006-12-15 Safety Plaquette de coupe et fraise a trefler
US7223053B2 (en) * 2004-09-01 2007-05-29 Berkshire Precision Tool, Llc Helical flute end mill with multi-section cutting edge

Non-Patent Citations (1)

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Title
See references of WO2008068158A1 *

Also Published As

Publication number Publication date
JP2010511522A (ja) 2010-04-15
US20100098504A1 (en) 2010-04-22
WO2008068158A1 (fr) 2008-06-12
DE102006058258A1 (de) 2008-06-12

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