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WO1993013899A1 - Plaquette de coupe - Google Patents

Plaquette de coupe Download PDF

Info

Publication number
WO1993013899A1
WO1993013899A1 PCT/DE1992/001092 DE9201092W WO9313899A1 WO 1993013899 A1 WO1993013899 A1 WO 1993013899A1 DE 9201092 W DE9201092 W DE 9201092W WO 9313899 A1 WO9313899 A1 WO 9313899A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
cutting insert
insert according
cutting edge
corner
Prior art date
Application number
PCT/DE1992/001092
Other languages
German (de)
English (en)
Inventor
Wolfgang Hintze
Dieter Rupietta
Original Assignee
Krupp Widia Gmbh
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 Krupp Widia Gmbh filed Critical Krupp Widia Gmbh
Publication of WO1993013899A1 publication Critical patent/WO1993013899A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/085—Rake or top surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/12—Side or flank surfaces
    • B23B2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/20—Top or side views of the cutting edge
    • B23B2200/205—Top or side views of the cutting edge with cutting edge having a wave form

Definitions

  • the invention relates to a cutting insert for machining, in particular for turning, with an edge-free rake face that is wavy in the direction of the cutting edge.
  • Such cutting inserts are known, for example, from DE 37 31 426 AI in such a way that the rake face of the cutting insert is not only undulating in the direction of the cutting edge, but also runs straight to undulating perpendicular to it.
  • DE 25 44 991 C2 already describes a cutting insert with a wave-shaped cutting edge and a plurality of wave-shaped chip breaker stages arranged in terraces.
  • the chip breaker stages are intended to act on the chip in many and in different directions effective chip shape pressures which vary over the chip width, so that it is deformed criss-cross in a strong manner and consequently breaks quickly and briefly.
  • a cutting insert in which the cutting edge has indentations in places, which form edges on the rake face and corners on the cutting edge.
  • a cutting insert is also described in DE 28 40 610 A1, the cutting edges of which are interrupted by grooves or indentations which extend on the rake face and start from the perforated part of the cutting edge.
  • An increased plastic deformation of the chip should be achieved by making the transition between the rake face and cutting edge or the indentation as pronounced as possible, ie by forming the transition zones with sharp edges.
  • Corresponding recesses or notches on the Cutting edges are according to DE 28 50 026 AI he ⁇ aims that the free surface has respective recesses or notches that decrease in the direction away from the associated cutting edge.
  • the wave crests should be cut off so that milling teeth or straight cutting edge sections form between two troughs and the cutting edge sections on the opposite rake face complete with the opposite sections on the underside to a full cut, which is achieved in that there is a wave crest on the upper rake face opposite the wave troughs.
  • US-A-4,681,486 describes further open-space recesses which extend conically from the rake face with a positive open face to the contact surface.
  • EP 0 414 241 A2 describes a cutting insert with indentations breaking through the cutting edge on the rake face, which continues in corresponding indentations in the free surface, the indentations or indentations having a trapezoidal shape in cross section.
  • the cutting insert described in claim 1 which is characterized in that the respectively adjacent free surface is wave-shaped, the mutually parallel wave crests perpendicular to the cutting edge affecting the plane which runs through the corner points delimiting the cutting edge and which is perpendicular to a plane formed by all cutting edges. Not only the rake face, but also the free face is thus undulating along the cutting edge in the area adjacent to the cutting edge. The open area runs in the area of the cutting corner towards a wave crest. Due to this design, the chip assumes a strongly undulating cross-section, whereby it is stretched more when bent, i.e. breaks more easily. At the same time, with larger chip thicknesses, a softer cut is achieved through lower cutting forces.
  • the distance between the wave crests and the wave troughs is a maximum of 5 to 30%, preferably 8 to 16% of the cutting insert thickness, preferably it is between 0.07 and 1.6 mm, in particular between 0.15 and 0, 8 mm. With this dimensioning, the advantage can additionally be achieved that the cutting insert can be clamped in standardized tool holders.
  • the number of wave crests on the open area is at least 3, at most 20, preferably between 3 and 8. This means that ensures that a sufficient contact of the Schneidein ⁇ set is in its holder so that standard holder ver ⁇ are reversible.
  • the number of wave crests on the rake face is between 2 to 20, preferably 2 and 8.
  • the shafts on the free face and / or on the rake face run at least partially with a curvature which corresponds to a circle radius between 0.5 to 40 mm.
  • the open surfaces and rake surfaces formed from wave crests or wave crests and wave valleys and the resulting wavy cutting edge consist of waves of the same dimensions, i.e. the wave crests and troughs are equally spaced from one another and have the same wave depth.
  • the wave-shaped rake surface along the cutting edge preferably has convex sections falling from the circular or cylindrical segments with radii of 20 to 40 mm and a concave central region with radii of 0.5 to 15 mm, falling towards the center of the cutting edge.
  • the undulating open area consists of circular or cylindrical segments. This can have the effect that the chip segments generated by several shafts of the cutting edge run in different directions, thereby counteracting a knotting of the chip segments with one another.
  • the wave ridges are widened into straight sections with a length of 0.1 to 2 mm, preferably 0.3 to 1 mm.
  • the wavelength can be along the cutting edge or in a parallel to it Wave crest to be different from the next wave crest, the wavelength preferably being between 2 and 8 times the corner radius. Due to the increasing wavelength towards the sharp corner of the insert, greater stability of the cutting corner is achieved. Larger wavelengths also result in a greater distance between the chip segments being formed, which furthermore prevents the chips from becoming entangled. Preferably, the wavelength increases towards the center of the cutting edge.
  • the convex regions of the shafts have radii of curvature that are 2 to 20 times larger than the concave regions, as a result of which greater cutting edge stability can be achieved.
  • an approximately sinusoidal wave is deliberately deviated by making the wave crests wider and the wave troughs shorter.
  • the convex areas of the shafts facing away from the cutting corner have a smaller radius of curvature than the convex areas facing the cutting corner, preferably 1 to 4 mm compared to 8 to 40 mm. It is hereby achieved that, for example, when cutting out, the chip width of the chip segments is reduced and the chip thickness is increased, whereby chip breaking can be further improved compared to a wave cutting edge made of the same radii.
  • the wavy rake face is preferably additionally inclined by an angle of inclination which is in the range between 2 and 15 °.
  • This positive rake face geometry serves to further reduce the cutting force and prevents damage to the machined workpiece surface by chips.
  • the inclined serrated edge in the area of the corner forming an obtuse angle is raised to the height of the corner forming an acute angle in the case of indexable inserts with rhombic or polygonal cutting bodies.
  • chip-forming steps or chip-forming elements are preferably arranged at a distance from the cutting edge, possibly in a row along a parallel of the cutting edge. If one chooses a chip form step as chip form element, the chip form step outlet is preferably formed by waves corresponding to the wavy cutting edge form. In this way, the contact between the chip and the cutting body and consequently the cutting force is further reduced. When turning longitudinally with a large chip width and a small chip thickness, the guidance of the chip and thus the chip break is improved.
  • FIG. 1 is a perspective view of a cutting insert according to the present invention
  • FIG. 2 is a top view of the cutting insert of FIG. 1,
  • FIG. 3 is a side view of the cutting insert according to FIG. 1 or 2
  • FIG. 4 shows a side view of a cutting insert in an alternative embodiment with draining chips
  • FIG. 5 shows a schematic top view of a further cutting insert
  • 6 shows a perspective view of the further cutting insert according to FIG. 5
  • FIG. 7 shows a further embodiment of the cutting insert according to the invention in a top view
  • FIG. 12 shows a cutting insert corresponding to FIG. 11 in a perspective view.
  • the cutting insert according to the invention is generally designed as a cutting insert and each has an upper rake face 21 and a lower rake face 22.
  • the rake face has a polygon shape when viewed from above, is generally triangular, square or in particular rhombic or rectangular, square or polygonal educated.
  • the rake face 21 forms four cutting corners 23.
  • a common boundary of the respective free surfaces 24 and the rake surfaces 21 and 22 is formed by the cutting edge 25, which has a wave-shaped course following the relevant design of the rake surface and the free surface.
  • the indexable insert has a fastening hole 26 or, at a suitable point, a clamping trough for receiving a clamping claw or a similar fastening means.
  • the free surface 24 has wave crests reaching from cutting edge to cutting edge and valleys in between, which are arranged in such a way that the crests 25a (in contrast to the valleys 25b) lie in a plane 27 in which the corner points 23 lie and which is perpendicular to a plane formed by all the cutting edges 25.
  • Level 27 can be seen as the envelope of the open space. This construction means that the wave shape of the open area at the cutting corner tends to a maximum, ie a wave crest or wave crest.
  • the rake face is also wave-shaped along the cutting edge 25, it follows the wave course given by the free face.
  • the base point 28 of a central chip-forming element 29 which, with the exception of the circumferential rising surfaces, is flat. This central plateau projects beyond the circumferential cutting edge 25.
  • the maximum distance 30 (see FIG. 5) of the wave crests or wave crests 25a and valleys 25b is between 8 to 16% of the plate thickness 31, preferably in the range between 0.15 to 8 mm .
  • the cutting insert can be clamped in standardized tool holders without any problems.
  • each cutting edge or free surface has four valleys 25b and five wave crests 25a, of which the two outer ends end in the corners 23.
  • an indexable insert of the shape CNMG 120408 was used for turning.
  • the corresponding waves on the chip face and the free face are composed of circles with a radius of 2.7 mm.
  • the height of the waves, ie the distance 30 was 0.16 mm.
  • a flat shoulder was machined radially from the inside out on a workpiece made of Ck 45. The measurements on the shoulder were varied in the range from 0.2 to 0.9 mm, the feeds in the range from 0.2 to 0.4 mm.
  • the cutting insert according to the invention each delivered individual broken chips of about 1 mm width.
  • the chips 32 which arise in each case when copying out are shown in FIG. 4, for example.
  • the shaping of the rake face by means of circular segments 33 with radii of 20 to 40 mm effectively prevents chips 32 from becoming tangled, since the chips 32 run in different directions.
  • the wavelength along the cutting edge 25 can be variable, a greater stability of the cutting corner being achieved by a wavelength increasing towards the sharp corner of the indexable insert.
  • the wavelength 34a increases over 34b to the longest wavelength 34c in the direction of the pointed corner of a rhombic indexable insert.
  • the rhombic cutting plate shown in FIG. 7 has two opposing pointed cutting corners 23, the convex regions 35 having a radius of curvature at least twice as large as the concave regions 36.
  • the convex areas 37 facing away from the pointed cutting corner have a smaller radius of curvature than the convex areas 38 facing the cutting corner, for example in a ratio of 1:10.
  • the cutting insert according to FIG. 8 another inclined serrated cutting edge 25, the inclination angle 39 is about 5 °. When cutting with the respective acute-angle cutting corner 23 the friction of the trailing chip is on ⁇ reason of the inclination angle 39 significantly reduced.
  • FIG. 9 shows a corresponding embodiment according to FIG. 8, but with a chip-forming element 29, which lies without inclination in a plane perpendicular to the plane defined by the free surfaces 24 and projects beyond the corners 23.
  • the inclined shaft cutter 25 in the region of the blunt corner can be increased to the height or in the plane by raising 40 the pointed cutting corners 23 are raised.
  • the chip form stage run-out i.e. the respective base point 28 or the line formed thereby is formed by a shaft corresponding to the undulating cutting edge 25.
  • this can also be done in conjunction with a chip-forming element 29 which is perpendicular to the plane defined by the free surfaces 24 and thus does not follow the angle of inclination or the falling of the cutting edge. This results in full contact surfaces on the top and bottom of the rake faces 21 and 22.

Landscapes

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

Abstract

La présente invention concerne une plaquette de coupe pour l'usinage par enlèvement de copeaux, en particulier pour le tournage, avec une face de coupe sans arête, ondulée dans le sens de l'arête de coupe (25) et une face libre également ondulée. Les crêtes des ondulations parallèles perpendiculaires à l'arête de coupe (25) sont tangentielles au plan (27) qui passe par les points d'angle (23) délimitant l'arête de coupe (25) et qui est perpendiculaire à un plan formé par toutes les arêtes de coupe (25).
PCT/DE1992/001092 1992-01-17 1992-12-28 Plaquette de coupe WO1993013899A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19924201112 DE4201112C2 (de) 1992-01-17 1992-01-17 Schneideinsatz
DEP4201112.4 1992-01-17

Publications (1)

Publication Number Publication Date
WO1993013899A1 true WO1993013899A1 (fr) 1993-07-22

Family

ID=6449701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1992/001092 WO1993013899A1 (fr) 1992-01-17 1992-12-28 Plaquette de coupe

Country Status (2)

Country Link
DE (1) DE4201112C2 (fr)
WO (1) WO1993013899A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434297A1 (de) * 1994-09-13 1996-03-14 Widia Gmbh Schneideinsatz
WO1996029172A1 (fr) * 1995-03-17 1996-09-26 Kennametal Inc. Plaquette de coupe rapportee helicoidale a aretes decalees
US5921721A (en) * 1994-09-13 1999-07-13 Widia Gmbh Cutting insert
US7374372B2 (en) 2005-03-11 2008-05-20 Ceratizit Austria Gmbh Indexable insert
EP2025436A3 (fr) * 2005-02-19 2009-09-02 MWS Schneidwerkzeuge GmbH & Co KG Plaquette de coupe
US7607869B2 (en) 2007-09-09 2009-10-27 Iscar, Ltd. Cutting insert having main and secondary chip formers
CN101837485A (zh) * 2010-05-24 2010-09-22 株洲钻石切削刀具股份有限公司 一种铣削用刀片、铣削刀具及铣削刀具安装方法
EP2734328A4 (fr) * 2011-07-22 2015-03-18 Kennametal India Ltd Insert de forage indexable
US9168589B2 (en) 2011-07-22 2015-10-27 Kennametal India Limited Indexable drill insert
US9272335B2 (en) 2011-07-22 2016-03-01 Kennametal India Limited Idexable drill insert
US9993881B2 (en) 2012-05-28 2018-06-12 Kennametal India Limited Idexable drill insert
CN108472741A (zh) * 2016-01-27 2018-08-31 J.G.魏瑟尔泽内有限责任两合公司 用于切削加工工件的方法、用于车床的刀盘以及车床
US10124415B2 (en) 2013-01-23 2018-11-13 Kennametal India Limited Indexable drill insert and rotary cutting tool employing same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5779401A (en) * 1993-09-13 1998-07-14 Widia Gmbh Cutting insert
DE4336055A1 (de) * 1993-09-13 1995-03-16 Krupp Widia Gmbh Schneideinsatz
US5807031A (en) * 1995-03-10 1998-09-15 Mitsubishi Materials Corp. Throw-away tip and throw-away type cutter
IL115338A (en) * 1995-09-18 1999-07-14 Iscar Ltd Exchangeable cutting insert and a tool assembly for use therewith
AT406241B (de) † 1998-03-31 2000-03-27 Boehlerit Gmbh & Co Kg Schneideinsatz für zerspanungswerkzeuge
WO2016136694A1 (fr) * 2015-02-24 2016-09-01 株式会社タンガロイ Outil de coupe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574911A (en) * 1969-12-17 1971-04-13 Milling Specialties Inc Cutter and inserts therefor
FR2183362A5 (fr) * 1972-05-04 1973-12-14 Giraud Pierre
FR2196215A1 (fr) * 1972-08-15 1974-03-15 Malinchak Paul
GB2097705A (en) * 1981-05-04 1982-11-10 Milling Specialties Inc Insert type milling cutter
US4794665A (en) * 1976-08-24 1989-01-03 Greenleaf Corporation Rotary cutter with serrated edges and positive/negative axial rake

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT990238B (it) * 1972-08-15 1975-06-20 Malinchak P Perfezionamento negli inserti ta glienti per macchine per la lavora zione di metalli
DE2544991C2 (de) * 1975-10-08 1981-06-04 Hertel, Karl, 8500 Nürnberg Schneideinsatz für die spanabhebende Bearbeitung
FR2392749A1 (fr) * 1977-06-02 1978-12-29 Nanini Antoine Plaquette pour outil de coupe
SE7710434L (sv) * 1977-09-19 1979-03-20 Sandvik Ab Sker for spanskerande bearbetning
US4140431A (en) * 1977-11-18 1979-02-20 Kennametal Inc. Cutting insert
JPS60178504U (ja) * 1984-05-07 1985-11-27 住友電気工業株式会社 スロ−アウエイチツプ
GB2179281B (en) * 1985-08-21 1989-12-06 Gen Electric Cutting tool insert having cutting edges with recesses
IL81283A (en) * 1987-01-16 1990-11-05 Kidan Cutting Tools Cutting inserts and tools including same
DE3731426A1 (de) * 1987-09-18 1989-04-06 Krupp Gmbh Schneideinsatz mit wellenfoermiger spanflaeche

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574911A (en) * 1969-12-17 1971-04-13 Milling Specialties Inc Cutter and inserts therefor
FR2183362A5 (fr) * 1972-05-04 1973-12-14 Giraud Pierre
FR2196215A1 (fr) * 1972-08-15 1974-03-15 Malinchak Paul
US4794665A (en) * 1976-08-24 1989-01-03 Greenleaf Corporation Rotary cutter with serrated edges and positive/negative axial rake
GB2097705A (en) * 1981-05-04 1982-11-10 Milling Specialties Inc Insert type milling cutter

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4434297A1 (de) * 1994-09-13 1996-03-14 Widia Gmbh Schneideinsatz
US5921721A (en) * 1994-09-13 1999-07-13 Widia Gmbh Cutting insert
WO1996029172A1 (fr) * 1995-03-17 1996-09-26 Kennametal Inc. Plaquette de coupe rapportee helicoidale a aretes decalees
EP2025436A3 (fr) * 2005-02-19 2009-09-02 MWS Schneidwerkzeuge GmbH & Co KG Plaquette de coupe
US7374372B2 (en) 2005-03-11 2008-05-20 Ceratizit Austria Gmbh Indexable insert
US7607869B2 (en) 2007-09-09 2009-10-27 Iscar, Ltd. Cutting insert having main and secondary chip formers
JP2010538841A (ja) * 2007-09-09 2010-12-16 イスカーリミテッド 切削インサート
CN101837485A (zh) * 2010-05-24 2010-09-22 株洲钻石切削刀具股份有限公司 一种铣削用刀片、铣削刀具及铣削刀具安装方法
EP2734328A4 (fr) * 2011-07-22 2015-03-18 Kennametal India Ltd Insert de forage indexable
US9168589B2 (en) 2011-07-22 2015-10-27 Kennametal India Limited Indexable drill insert
US9272335B2 (en) 2011-07-22 2016-03-01 Kennametal India Limited Idexable drill insert
US9370825B2 (en) 2011-07-22 2016-06-21 Kennametal India Limited Indexable drill insert
US9993881B2 (en) 2012-05-28 2018-06-12 Kennametal India Limited Idexable drill insert
US10124415B2 (en) 2013-01-23 2018-11-13 Kennametal India Limited Indexable drill insert and rotary cutting tool employing same
CN108472741A (zh) * 2016-01-27 2018-08-31 J.G.魏瑟尔泽内有限责任两合公司 用于切削加工工件的方法、用于车床的刀盘以及车床
US20190070671A1 (en) * 2016-01-27 2019-03-07 J.G. WEISSER SöHNE GMBH & CO. KG Method for machining a workpiece, tool head for a lathe, and lathe
CN108472741B (zh) * 2016-01-27 2020-10-23 J.G.魏瑟尔泽内有限责任两合公司 用于切削加工工件的方法、用于车床的刀盘以及车床

Also Published As

Publication number Publication date
DE4201112A1 (de) 1993-07-22
DE4201112C2 (de) 2002-10-17

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