US20050271482A1 - Ballnose end mill - Google Patents

Ballnose end mill Download PDF

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Publication number
US20050271482A1
US20050271482A1 US11/022,823 US2282304A US2005271482A1 US 20050271482 A1 US20050271482 A1 US 20050271482A1 US 2282304 A US2282304 A US 2282304A US 2005271482 A1 US2005271482 A1 US 2005271482A1
Authority
US
United States
Prior art keywords
cutting
end mill
tool
drill
flat
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.)
Abandoned
Application number
US11/022,823
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English (en)
Inventor
Vladimir Volokh
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
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 Individual filed Critical Individual
Publication of US20050271482A1 publication Critical patent/US20050271482A1/en
Priority to US11/954,185 priority Critical patent/US7909545B2/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • 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
    • 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
    • B23C5/1009—Ball nose end mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/40—Flutes, i.e. chip conveying grooves
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/46—Drills having a centre free from cutting edges or with recessed 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
    • 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
    • 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
    • Y10T407/1946—Face or end mill
    • Y10T407/1948—Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the present invention relates to tools for the machining of materials by milling or drilling. More particularly, the invention provides an improved form for an end mill having a semi-spherical cutting end, or flat cutting end, or drill end the center area of which is configured to better eject chips and thus to improve the surface finish of the metal work piece and tool life.
  • End mills and drills are widely used in milling and drilling operations due to their versatile range of application and due to the moderate first cost of the tool.
  • End mills and drills are often of cylindrical shape, and are available up to about 80 mm diameter.
  • End mills having a semispherical cutting end (referred to as ball end or ballnose) are widely used, being particularly useful for CNC work producing complex shapes.
  • End mills with flat cutting end are widely used in ramping, planging and orbital driling and drillind applications.
  • Drills are widely used in different drilling applications on milling and turning machines.
  • An end mill typically has 2 to 10 teeth, depending on diameter size and whether intended for rough cutting or finishing.
  • Teeth are usually of spiral (helical) shape, but can be straight parallel to the axis.
  • Material of construction is high speed steel, solid carbide, cermet or ceramic, or combinations thereof.
  • JP2001334405 and JP2001341026 have been found to provide inadequate chip clearance causing chip reentry and also insufficient access for coolant to the center of the end mill.
  • the tooth designs disclosed in the above documents may be optimized for maximum metal removal, or for maximum tool wear life or for resistance to breakage, or for hard or for soft materials, and the tooth form will vary greatly as a function of the different design parameters, and of the cutter diameter.
  • the present invention achieves the above objects by providing a ballnose end mill, end mills with flat cutting end used in ramping, planging and orbital driling and drilling applications and drills of diameter D configured for improved chip removal, comprising a body portion to be gripped by a machine tool and a plurality of flutes machined to form a cutting tooth adjacent to said flute, each tooth being provided with a chisel edge, the cutting end being semispherical, or flat, or like drill point and when viewed endwise there being seen a cutting edge starting proximate to the tool center at a position B above the x axis and 0.5A to the right of the y axis, said cutting edge extending at an angle a relative to the y axis for a length C, value of A, being the total off-set between cutting edges of two teeth disposed at 180° to each other, for the machining of different materials is 0.003D to 0.030D, both B and C having lengths of between 0.3A to 10.5A,
  • a ballnose end mill, or flat end mill, or drill wherein said cutting edge starting at position B is curved at a radius R, the locus of said radius being at its right side when viewing the upper tooth of the semi-spherical end, or flat end mill, or drill and the value of R is 0.5A ⁇ 5A.
  • the present inventors have prepared a 16 mm diameter two-flute ballnose end mill which was optimized for use on hard materials, coated TiAlN.
  • the end mill was manufactured according to the present specification and produced a smooth surface free from the characteristic flaws resulting from faulty chip clearing.
  • FIG. 1 is an elevational view of a prior-art ballnose end mill
  • FIG. 1 a an elevational view of a prior-art flat end mill
  • FIG. 1 b an elevational view of a prior-art drill.
  • FIG. 2 is an end view of the prior art ballnose end mill seen in FIG. 1 ;
  • FIG. 2 a is an end view of the prior art flat end mill-seen in FIG. 1 a;
  • FIG. 2 b is an end view of the prior art drill seen in FIG. 1 b;
  • FIG. 3 is an enlarged view of the center portion of a prior-art ballnose end mill FIG. 2 ;
  • FIG. 4 is an end view of a further prior-art ballnose end mill
  • FIG. 5 is an enlarged view of the center portion of FIG. 4 ;
  • FIG. 6 is an end view of an ballnose end mill according to the present invention.
  • FIG. 6 a is an end view of an flat end mill according to the present invention.
  • FIG. 6 b is an end view of an drill according to the present invention.
  • FIG. 7 is a an enlarged view of the center portion of FIG. 6 ; FIG. 6 a ; FIG. 6 b;
  • FIG. 8 is an end view of a further embodiment of the ballnose end mill according to the present invention.
  • FIG. 8 a is an end view of an flat end mill according to the present invention.
  • FIG. 8 b is an end view of an drill according to the present invention.
  • FIG. 9 is an enlarged view of the center portion of FIG. 8 , FIG. 8 a ; FIG. 8 b;
  • FIGS. 1 to 3 There is seen in FIGS. 1 to 3 a prior-art 2-flute helical ballnose end mill 10 , which corresponds to Japanese patents nos. JP2001334405 and JP2001341026.
  • FIGS. 1 a and 2 a there is seen a prior art 2 flute helical flat end mill while FIGS. 1 b and 2 b illustrate a prior art 2 flute helical drill.
  • the tools 10 , 10 a and 10 b have a shank portion 12 and tooth flanks 14 capped by a cutting edge 16 .
  • the cutting edge 16 of the cutter in FIG. 2, 2 a and 2 b and again greatly enlarged in FIG. 3 carries around the hemispherical end with an off-set A.
  • the width of the chisel edge 18 is between 0.01-0.20 mm.
  • the chisel edge angle relative to the cutting edge is 165-185°, so accordingly the chisel edge can be in line with the cutting edge.
  • the length L of the chisel edge 18 is between 3-7 times that of the chisel width.
  • FIGS. 4 and 5 A slightly different version of an end mill 20 is seen in FIGS. 4 and 5 .
  • the offset distance A is between 0.05 and 0.40 mm and again the chisel edge angle is 165-185°
  • FIGS. 6, 6 a , 6 b and 7 there is seen a ballnose end mill 22 , a flat end mill 22 a and a drill 22 b of diameter D according to the present invention.
  • the end mill 22 , the flat end mill 22 a and the drill 22 b are configured for improved chip removal, and comprises a body portion 12 , seen in FIG. 1 , FIG. 1 a , FIG. 1 b to be gripped by a machine tool and two flutes 26 machined to form a cutting tooth 24 adjacent to the flute 26 .
  • Each tooth 24 is provided with a cutting edge 28 , which continue, with a side-to-side changeover at the center.
  • a tooth-end cutting edge 32 starting proximate to the cutter center 34 at a distance B above the x axis and a distance 0.5A to the right of the y axis.
  • the tooth end cutting edge 32 extends at an angle a relative to the y axis for a length C.
  • FIG. 8 FIG. 8 a , FIGS. 8 b and 9 , there is depicted a further embodiment of a ballnose end mill 36 , a flat end mill 36 a , and a drill 36 b also according to the present invention.
  • a tooth-end cutting edge 38 is seen starting at a distance B above the x axis and a distance 0.5A to the right of the y axis, as seen in FIG. 7 .
  • the edge 38 is curved at a radius R.
  • the locus of the radius R is to the right of the y axis when viewing the upper tooth 28 of the tools.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Drilling Tools (AREA)
US11/022,823 2003-12-19 2004-12-28 Ballnose end mill Abandoned US20050271482A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/954,185 US7909545B2 (en) 2003-12-19 2007-12-11 Ballnose end mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ILIL159639 2003-12-29
IL159639A IL159639A (en) 2003-12-29 2003-12-29 Ballnose end mill

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/954,185 Continuation US7909545B2 (en) 2003-12-19 2007-12-11 Ballnose end mill

Publications (1)

Publication Number Publication Date
US20050271482A1 true US20050271482A1 (en) 2005-12-08

Family

ID=33485377

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/022,823 Abandoned US20050271482A1 (en) 2003-12-19 2004-12-28 Ballnose end mill
US11/954,185 Expired - Lifetime US7909545B2 (en) 2003-12-19 2007-12-11 Ballnose end mill

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/954,185 Expired - Lifetime US7909545B2 (en) 2003-12-19 2007-12-11 Ballnose end mill

Country Status (4)

Country Link
US (2) US20050271482A1 (https=)
EP (1) EP1559493A3 (https=)
JP (1) JP4879493B2 (https=)
IL (1) IL159639A (https=)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070172321A1 (en) * 2004-04-20 2007-07-26 Tamotsu Nagai Ball endmill
USD590851S1 (en) * 2008-04-14 2009-04-21 Seco Tools Ab Drilling tool tip
USD602965S1 (en) * 2008-10-14 2009-10-27 Seco Tools Ab Drilling tool tip
US9179923B2 (en) 2009-08-26 2015-11-10 Stryker Ireland, Ltd. Ribbed surgical bur
CN114728352A (zh) * 2020-01-09 2022-07-08 株式会社Moldino 球头立铣刀
RU241519U1 (ru) * 2025-10-24 2026-02-24 Акционерное общество "Новые инструментальные решения" Сферическая концевая радиусная фреза

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DE202004010977U1 (de) * 2004-05-28 2005-10-13 Kennametal Inc. Bohrer, insbesondere Spiralbohrer
DE102005043841B4 (de) * 2005-09-13 2009-01-22 Franken GmbH + Co KG Fabrik für Präzisionswerkzeuge Radiusfräser, insbesondere Kugel- oder Torusfräser, mit Querschneide und/oder Abflachung
JP4940863B2 (ja) * 2006-09-29 2012-05-30 株式会社タンガロイ スローアウェイ式回転工具
SE0950135A1 (sv) * 2009-03-09 2010-06-08 Seco Tools Ab Skärverktyg med radiella skäreggar
EP2457678B1 (fr) * 2010-11-29 2016-03-30 Techspace Aero S.A. Outil de coupe monobloc bimatériaux
CN102328127B (zh) * 2011-09-22 2013-04-10 山东理工大学 微细锥形球头铣刀
WO2014175396A1 (ja) * 2013-04-26 2014-10-30 京セラ株式会社 ドリルおよびそれを用いた切削加工物の製造方法
EP3187294A1 (en) * 2015-12-30 2017-07-05 Bomar S.A. w upadlosci ukladowej A method of shaping a gear
WO2019244106A1 (en) 2018-06-22 2019-12-26 Maestro Logistics, Llc A drill bit and method for making a drill bit
JP7320391B2 (ja) * 2019-06-28 2023-08-03 株式会社Subaru エンドミル及び穿孔方法
CN111230195B (zh) * 2020-02-27 2021-06-04 厦门金鹭特种合金有限公司 一种球头铣刀
JP7516447B2 (ja) * 2022-03-18 2024-07-16 ユニオンツール株式会社 ボールエンドミル

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US4373839A (en) * 1979-10-02 1983-02-15 Mitsubishi Kinzoku Kabushiki Kaisha Drill bit
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US4984943A (en) * 1989-05-26 1991-01-15 Hamilton Martin N Drill with balanced inserts
US6238151B1 (en) * 1998-09-28 2001-05-29 Mitsubishi Materials Corporation Drilling tool and throw-away tip for use in drilling work

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US4143723A (en) * 1977-10-04 1979-03-13 Schmotzer Norman H Carbide tipped drill bit for boring holes in concrete and steel
US4373839A (en) * 1979-10-02 1983-02-15 Mitsubishi Kinzoku Kabushiki Kaisha Drill bit
US4565471A (en) * 1979-10-02 1986-01-21 Mitsubishi Kinzoku Kabushiki Kaisha Drill bit
US4984943A (en) * 1989-05-26 1991-01-15 Hamilton Martin N Drill with balanced inserts
US6238151B1 (en) * 1998-09-28 2001-05-29 Mitsubishi Materials Corporation Drilling tool and throw-away tip for use in drilling work

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070172321A1 (en) * 2004-04-20 2007-07-26 Tamotsu Nagai Ball endmill
USD590851S1 (en) * 2008-04-14 2009-04-21 Seco Tools Ab Drilling tool tip
USD600260S1 (en) * 2008-04-14 2009-09-15 Seco Tools Ab Drilling tool
USD609257S1 (en) * 2008-04-14 2010-02-02 Seco Tools Ab Drilling body of a drilling tool
USD617357S1 (en) * 2008-04-14 2010-06-08 Seco Tools Ab Drilling tool
USD602965S1 (en) * 2008-10-14 2009-10-27 Seco Tools Ab Drilling tool tip
USD613318S1 (en) * 2008-10-14 2010-04-06 Seco Tools Ab Drilling body of a drilling tool
US9179923B2 (en) 2009-08-26 2015-11-10 Stryker Ireland, Ltd. Ribbed surgical bur
CN114728352A (zh) * 2020-01-09 2022-07-08 株式会社Moldino 球头立铣刀
US11772173B2 (en) 2020-01-09 2023-10-03 Moldino Tool Engineering, Ltd. Ball end mill
RU241519U1 (ru) * 2025-10-24 2026-02-24 Акционерное общество "Новые инструментальные решения" Сферическая концевая радиусная фреза

Also Published As

Publication number Publication date
JP4879493B2 (ja) 2012-02-22
US7909545B2 (en) 2011-03-22
EP1559493A2 (en) 2005-08-03
JP2005205593A (ja) 2005-08-04
IL159639A (en) 2009-09-22
IL159639A0 (en) 2004-06-01
EP1559493A3 (en) 2007-12-05
US20080152438A1 (en) 2008-06-26

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