ES2633849T3 - Inserto de corte que tiene depresiones de holgura cóncava formadas en las superficies laterales de esquina - Google Patents

Inserto de corte que tiene depresiones de holgura cóncava formadas en las superficies laterales de esquina Download PDF

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Publication number
ES2633849T3
ES2633849T3 ES11816864.0T ES11816864T ES2633849T3 ES 2633849 T3 ES2633849 T3 ES 2633849T3 ES 11816864 T ES11816864 T ES 11816864T ES 2633849 T3 ES2633849 T3 ES 2633849T3
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ES
Spain
Prior art keywords
corner
edge
raised
cutting
minor
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.)
Active
Application number
ES11816864.0T
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English (en)
Inventor
Eric William Nguyen
William Bennett Johnson
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.)
Ingersoll Cutting Tool Co
Original Assignee
Ingersoll Cutting Tool Co
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 Ingersoll Cutting Tool Co filed Critical Ingersoll Cutting Tool Co
Application granted granted Critical
Publication of ES2633849T3 publication Critical patent/ES2633849T3/es
Active legal-status Critical Current
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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
    • B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/202—Plate-like cutting inserts with special form
    • B23C5/205—Plate-like cutting inserts with special form characterised by chip-breakers of special form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/08—Rake or top surfaces
    • B23C2200/085—Rake or top surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/12—Side or flank surfaces
    • B23C2200/128—Side or flank surfaces with one or more grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/36—Other features of the milling insert not covered by B23C2200/04 - B23C2200/32
    • B23C2200/367—Mounted tangentially, i.e. where the rake face is not the face with largest area
    • 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
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1908—Face or end mill
    • Y10T407/1924—Specified tool shape
    • 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
    • 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
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y10T409/303808—Process including infeeding

Landscapes

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

Abstract

Un inserto de corte (100) para uso en una fresa que comprende: dos superficies de extremo opuestas idénticas (102a, 102b), estando provista cada superficie de extremo de una superficie de tope (104); una superficie periférica lateral (110) que se extiende entre las dos superficies de extremo opuestas (102a, 102b), comprendiendo la superficie lateral periférica dos superficies laterales mayores opuestas (112a, 112b), dos superficies laterales menores opuestas (114a, 114b) y superficies laterales de esquina (116a, 116b, 116c, 116d) situadas entre las superficies laterales mayores y menores adyacentes; un borde periférico (120a, 120b) formado en la intersección de cada superficie de extremo (102a, 102b) y la superficie lateral periférica (110); cada superficie de extremo (102a, 102b) tiene cuatro esquinas (130a, 130b, 130c, 130d) incluyendo dos esquinas rebajadas diagonalmente opuestas (130a, 130d) y dos esquinas elevadas diagonalmente opuestas (130b, 130c), estando las esquinas rebajadas (130a, 130d) más cerca que las esquinas elevadas (130b, 130c) de un plano mediano (M) del inserto de corte cuyo plano mediano (M) pasa a través de las superficies laterales mayores y menores (112a, 112b, 114a, 114b) y está a medio camino entre las superficies de extremo (102a, 102b); en el que: al menos un borde periférico (120a) comprende dos conjuntos de bordes de corte, comprendiendo cada conjunto de bordes de corte: un borde de corte (140b) de esquina elevada relacionado con una primera superficie lateral de esquina (116b); un borde de corte principal (142b) adyacente al borde de corte (140b) de esquina elevada y que se extiende a lo largo de una primera superficie lateral principal (112b); un borde de corte (140a) de esquina rebajada relacionado con una segunda superficie lateral de esquina (116a), compartiendo la segunda superficie lateral (116a) de esquina y la primera superficie lateral (116b) de esquina la primera superficie lateral menor (114b); caracterizado por que cada conjunto de bordes de corte comprende además un borde rascador (144b) de esquina elevada adyacente al borde de corte (140b) de esquina elevada y que se extiende a lo largo de una primera superficie lateral menor (114b) que comparte la primera superficie lateral (116b) de esquina con la primera superficie lateral principal (112b); un borde rascador (146a) de esquina rebajada adyacente al borde de corte (140a) de esquina rebajada y que se extiende a lo largo de la primera superficie lateral menor (114b) hacia el borde rascador (144b) de esquina elevada ; en el que cada superficie lateral de esquina (116a, 116b, 116c, 116d) está provista de una depresión de holgura cóncava (150) que se extiende desde el borde de corte (140a) de esquina rebajada , más allá del plano mediano (M), y en una dirección, pero sin intersecarse, con un borde de corte (130b) de esquina elevada vinculado al borde periférico opuesto (120b), formando la depresión de holgura cóncava (150) una superficie de alivio (152) para el borde de corte (140a) de esquina rebajada y siendo visible tanto en una vista lateral principal como en una vista lateral secundaria del inserto de corte.

Description

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Claims (1)

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ES11816864.0T 2010-08-13 2011-08-05 Inserto de corte que tiene depresiones de holgura cóncava formadas en las superficies laterales de esquina Active ES2633849T3 (es)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US855965 1997-05-14
US12/855,965 US8449230B2 (en) 2010-08-13 2010-08-13 Cutting insert having concave clearance depressions formed on corner side surfaces
PCT/US2011/046824 WO2012021414A1 (en) 2010-08-13 2011-08-05 Cutting insert having concave clearance depressions formed on corner side surfaces

Publications (1)

Publication Number Publication Date
ES2633849T3 true ES2633849T3 (es) 2017-09-25

Family

ID=45564926

Family Applications (1)

Application Number Title Priority Date Filing Date
ES11816864.0T Active ES2633849T3 (es) 2010-08-13 2011-08-05 Inserto de corte que tiene depresiones de holgura cóncava formadas en las superficies laterales de esquina

Country Status (12)

Country Link
US (1) US8449230B2 (es)
EP (1) EP2603339B1 (es)
JP (1) JP5832539B2 (es)
KR (1) KR101776983B1 (es)
CN (1) CN103189156B (es)
BR (1) BR112013003232B1 (es)
CA (1) CA2808319C (es)
ES (1) ES2633849T3 (es)
PL (1) PL2603339T3 (es)
PT (1) PT2603339T (es)
RU (1) RU2564494C2 (es)
WO (1) WO2012021414A1 (es)

Families Citing this family (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533269C2 (sv) * 2008-12-17 2010-08-03 Sandvik Intellectual Property Dubbelsidigt, indexerbart planfrässkär
EP2529868B1 (en) * 2010-01-29 2019-05-29 Kyocera Corporation Cutting insert, cutting tool, and manufacturing method for cut product using same
CN106862600A (zh) 2012-06-01 2017-06-20 株式会社日研工作所 端铣刀的柄部构造
KR101380884B1 (ko) 2012-06-14 2014-04-02 한국야금 주식회사 양면형 절삭 인서트
US20150117969A1 (en) * 2013-10-29 2015-04-30 Kennametal Inc. Cutting insert and shim for heavy machining operations
US9375793B2 (en) 2013-10-29 2016-06-28 Kennametal Inc. Cutting insert for heavy machining operations
US9358622B2 (en) 2013-11-21 2016-06-07 Iscar, Ltd. Single sided indexable ramping milling insert and ramping milling tool
KR101517979B1 (ko) 2014-07-08 2015-05-06 한국야금 주식회사 절삭 인서트 및 이를 장착한 절삭 공구
WO2016047795A1 (ja) 2014-09-26 2016-03-31 京セラ株式会社 切削インサート、切削工具及び切削加工物の製造方法
US10046398B2 (en) * 2014-12-15 2018-08-14 Seco Tools Ab Reinforced double-sided cutting insert and cutting tool with reinforced double-sided cutting insert
US9901992B2 (en) 2014-12-23 2018-02-27 Iscar, Ltd. Ramping insert and high-feed milling tool assembly
US9636758B2 (en) * 2014-12-23 2017-05-02 Iscar, Ltd. Ramping insert and high-feed milling tool assembly
EP3045246B1 (en) * 2015-01-14 2021-07-14 Sandvik Intellectual Property AB A cutting insert and a milling cutting tool
EP3072616B1 (en) * 2015-03-25 2018-10-10 Sandvik Intellectual Property AB Cutting insert and milling tool
KR101669560B1 (ko) * 2015-04-17 2016-11-10 한국야금 주식회사 절삭 인서트
USD765747S1 (en) * 2015-05-16 2016-09-06 Anthony P. LaMarca, Sr. Fly cutter cutting tool
USD778330S1 (en) 2015-07-16 2017-02-07 Kennametal Inc. Double-sided tangential cutting insert
US9981323B2 (en) 2015-07-16 2018-05-29 Kennametal Inc. Double-sided tangential cutting insert and cutting tool system using the same
USD777230S1 (en) 2015-07-16 2017-01-24 Kennametal Inc Double-sided tangential cutting insert
US9993884B2 (en) * 2015-07-16 2018-06-12 Kennametal Inc. Double-sided tangential cutting insert
US10493540B2 (en) * 2015-09-15 2019-12-03 Mitsubishi Materials Corporation Cutting insert and indexable cutting tool
US10076795B2 (en) * 2015-11-19 2018-09-18 Iscar, Ltd. Triangular tangential milling insert and milling tool
CN108698143B (zh) * 2016-03-28 2019-12-13 京瓷株式会社 切削工具用刀具
WO2017194304A1 (en) * 2016-05-13 2017-11-16 Seco Tools Ab Indexable single-sided cutting insert with means for preventing improper mounting of the insert, and cutting tool including such an insert
KR102330032B1 (ko) * 2016-06-22 2021-11-24 이스카 엘티디. 램핑 인서트 및 고 이송 밀링 공구 조립체
US10421134B2 (en) * 2016-11-17 2019-09-24 Kennametal Inc. Tangentially mounted indexable cutting insert with convex-shaped minor side surfaces and concave-shaped end surfaces
EP3375552B1 (en) * 2017-03-13 2022-12-21 Sandvik Intellectual Property AB Milling tool comprising a kit for the milling tool
US10518339B2 (en) * 2017-03-22 2019-12-31 Kennametal Inc. Tangentially mounted cutting insert with angled seating surface and recessed clearance surface
US10112242B1 (en) * 2017-04-21 2018-10-30 Iscar, Ltd. Ramping insert having non-positive cutting geometry and ramping tool
US10137510B1 (en) 2017-05-04 2018-11-27 Ingersoll Cutting Tool Company Rotary cutting tool having axially supported lead cutting insert and a continuous cutting edge
US10131004B1 (en) 2017-05-04 2018-11-20 Ingersoll Cutting Tool Company Cutting insert having non-identical rectangular end surfaces with raised and lowered corner portions and cutting tool
EP3406378A1 (en) * 2017-05-23 2018-11-28 Walter Ag Cutting insert and milling tool
JP6776199B2 (ja) * 2017-07-18 2020-10-28 日本特殊陶業株式会社 切削インサート
US10427225B2 (en) * 2017-11-15 2019-10-01 Kennametal Inc. Tangentially mounted indexable cutting insert with segmented cutting edge and triangular-shaped margin
KR102011329B1 (ko) * 2017-12-29 2019-08-14 한국야금 주식회사 절삭 인서트 및 이를 장착한 절삭 공구
US20210379678A1 (en) * 2018-10-23 2021-12-09 Kyocera Corporation Cutting insert, cutting tool and method for manufacturing machined product
US11027342B2 (en) 2019-03-27 2021-06-08 Iscar, Ltd. Double-sided cutting insert having diagonally opposed raised corners and diagonally opposed lowered corners, and rotary cutting tool
DE112021003098T5 (de) 2020-06-03 2023-04-06 Kyocera Corporation Schneideinsatz, schneidwerkzeug, und verfahren zur herstellung eines maschinell bearbeiteten produkts
RU204571U1 (ru) * 2021-02-01 2021-05-31 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Плунжерная фреза с тангенциальным расположением пластин
WO2023063183A1 (ja) * 2021-10-11 2023-04-20 京セラ株式会社 切削インサート、切削工具及び切削加工物の製造方法

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2274386A1 (fr) * 1974-06-14 1976-01-09 Ugine Carbone Plaquette de coupe avec brise-copeaux
US4966500A (en) * 1987-09-16 1990-10-30 Mitsubishi Kinzoku Kabushiki Kaisha Face milling cutter with cutter inserts
SE502084C2 (sv) * 1993-04-05 1995-08-07 Sandvik Ab Skärplatta med konkavt krökta spånbrytare
JP3317089B2 (ja) * 1995-06-01 2002-08-19 三菱マテリアル株式会社 スローアウェイチップ及びスローアウェイ式カッタ
SE512040C2 (sv) * 1998-05-06 2000-01-17 Sandvik Ab Vändskär för pinnfräsar
US6056485A (en) * 1998-09-01 2000-05-02 Kennametal Inc. Ramp plunge and feed milling cutter
US6336776B1 (en) * 1999-12-16 2002-01-08 Valenite Inc. Milling cutter and insert therefor
JP3472752B2 (ja) * 2000-08-03 2003-12-02 住友電気工業株式会社 スローアウェイチップ及びそれを用いたピンミラーカッタ
US6503028B1 (en) * 2001-06-15 2003-01-07 Sandvik Aktiebolag Sintered cutting insert having center hole for clamp screw
IL153252A0 (en) 2002-06-04 2003-07-06 Iscar Ltd Tangential cutting insert and milling cutter
DE10312922B4 (de) * 2003-03-22 2006-02-16 Walter Ag Schneidplatte und Fräswerkzeug
DE10317760B4 (de) * 2003-04-17 2005-08-25 Walter Ag Fräswerkzeug und Schneidplatte für ein solches
US7220083B2 (en) 2003-10-15 2007-05-22 Tdy Industries, Inc. Cutting insert for high feed face milling
JP4710858B2 (ja) * 2004-04-06 2011-06-29 三菱マテリアル株式会社 インサート着脱式転削工具
US7104735B2 (en) 2004-09-02 2006-09-12 Ingersoll Cutting Tool Company Tangential cutting insert and milling cutter
JP2006181702A (ja) 2004-12-28 2006-07-13 Sumitomo Electric Hardmetal Corp 刃先交換式チップとそれを用いたエンドミル
DE102005054434B4 (de) * 2005-11-15 2009-09-24 Kennametal Inc. Wendeschneidplatte mit zwei Teilkörpern
KR100817259B1 (ko) * 2007-01-29 2008-03-27 한국야금 주식회사 절삭 인서트
JP2008229745A (ja) * 2007-03-16 2008-10-02 Mitsubishi Materials Corp 切削インサートおよびインサート着脱式転削工具
RU2453403C2 (ru) 2007-04-26 2012-06-20 Таегу Тек Индиа П. Лтд. Режущая пластина для фрезы
US7583228B2 (en) 2007-07-13 2009-09-01 Wistron Neweb Corp. Antenna, antenna combination, and portable electronic device having the antenna or antenna combination
SE531850C2 (sv) * 2007-12-13 2009-08-25 Seco Tools Ab Skär och verktyg för spånavskiljande bearbetning
KR100937459B1 (ko) * 2008-03-26 2010-01-19 대구텍 유한회사 접선 방향 절삭 인서트
US8277153B2 (en) * 2009-12-02 2012-10-02 Kennametal Inc. Cutting insert and shim for heavy machining operations

Also Published As

Publication number Publication date
KR101776983B1 (ko) 2017-09-08
PT2603339T (pt) 2017-06-15
BR112013003232A2 (pt) 2016-06-07
EP2603339A4 (en) 2015-12-30
CN103189156A (zh) 2013-07-03
US8449230B2 (en) 2013-05-28
RU2564494C2 (ru) 2015-10-10
WO2012021414A1 (en) 2012-02-16
US20120039678A1 (en) 2012-02-16
CA2808319A1 (en) 2012-02-16
EP2603339B1 (en) 2017-05-03
BR112013003232B1 (pt) 2020-06-16
PL2603339T3 (pl) 2017-09-29
EP2603339A1 (en) 2013-06-19
CA2808319C (en) 2017-06-13
RU2013110838A (ru) 2014-09-20
JP5832539B2 (ja) 2015-12-16
KR20130100128A (ko) 2013-09-09
JP2013535351A (ja) 2013-09-12
CN103189156B (zh) 2014-12-17

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