WO2023074921A1 - Outil de coupe avec outil à l'intérieur de passages de refroidissement - Google Patents

Outil de coupe avec outil à l'intérieur de passages de refroidissement Download PDF

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Publication number
WO2023074921A1
WO2023074921A1 PCT/KR2021/015045 KR2021015045W WO2023074921A1 WO 2023074921 A1 WO2023074921 A1 WO 2023074921A1 KR 2021015045 W KR2021015045 W KR 2021015045W WO 2023074921 A1 WO2023074921 A1 WO 2023074921A1
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WO
WIPO (PCT)
Prior art keywords
cutter
cooling channel
channel
core
cutting
Prior art date
Application number
PCT/KR2021/015045
Other languages
English (en)
Korean (ko)
Inventor
남정수
김태곤
김성현
이석우
신강우
Original Assignee
한국생산기술연구원
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 한국생산기술연구원 filed Critical 한국생산기술연구원
Priority claimed from KR1020210142342A external-priority patent/KR102611096B1/ko
Priority claimed from KR1020210142333A external-priority patent/KR102582433B1/ko
Publication of WO2023074921A1 publication Critical patent/WO2023074921A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/06—Drills with lubricating or cooling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/28—Features relating to lubricating or cooling

Definitions

  • the present invention relates to a cutting tool having a tool internal cooling passage, and more particularly, to a cutting tool having a tool internal cooling passage provided with a cooling passage inside the tool.
  • machine tools are used for the purpose of processing metal workpieces into desired shapes and dimensions using appropriate tools by various cutting or non-cutting processing methods, such as CNC (Computerized Numerical Control) lathes or semi-automatic machines.
  • CNC Computerized Numerical Control
  • Semi-automatic machines There are types such as NC machines or machining centers.
  • Such a machine tool is provided with a cutting tool for performing cutting, and a tool holder coupled to a spindle to connect the spindle and the tool and fixing the tool.
  • conventional cutting tools such as solid end mills and drills are made by processing metal materials suitable for use as cutting tools, and have a completely solid structure in which cutting oil is supplied to the outside to cool the cutting heat, and cooling that can supply cutting oil
  • a hollow structure in which a channel is provided as a hollow therein.
  • cutting oil can be supplied to the outside as well as to the inside to further cool the cutting heat that may be generated during cutting, but the machining of the cooling channel Due to the limitations, it is difficult to supply enough cutting oil to the area adjacent to the cutting edge.
  • the cooling channel formed in the existing cutting tool is formed by drilling in the center of the cutting tool or its periphery, and it is difficult to form it near the cutting edge where cutting heat is concentrated. It is almost impossible to machine form the channel cross section.
  • An object of the present invention to solve the above problems is to apply 3D printing technology to a cutting tool to form a cutting channel as close as possible to the cutting edge of the cutting tool, thereby improving cooling performance for the cutting edge compared to conventional cutting tools. It is to provide a cutting tool having a cooling passage inside the tool, which can sufficiently increase, and which can increase cutting precision, stability, and productivity in high-speed machining.
  • the core portion a cutter provided outside the core part; and a cutter cooling channel positioned adjacent to a cutting surface of the cutter in the cutter, wherein the cutter cooling channel is formed in the cutter as the core portion and the cutter are formed by metal 3D printing.
  • the cutter has a rake face corresponding to the cutting surface and a flank face corresponding to the guide of cutting chips, and the cutter cooling channel is disposed closer to the rake face than the flank face.
  • the cutter cooling channel may have a cross-sectional shape extending from an edge portion of the cutter toward a boundary between the core portion and the cutter.
  • the cutter cooling channel may have a cross-sectional shape obtained by reducing the shape of the cutter.
  • the cross-sectional thickness between the rake face of the cutter and the cutter cooling channel may be less than 1/5 of the diameter of the core.
  • the cross-sectional thickness between the cutter's flank face and the cutter cooling channel is between 1.5 and 3 times the cross-sectional thickness between the cutter's rake face and the cutter cooling channel.
  • a core cooling channel provided in the central portion of the core unit may further include.
  • the cutter and the cutter cooling channel are provided in a plurality of spiral shapes along the outer circumferential surface of the core portion, the core cooling channel is separated from the cutter cooling channel, and the core portion, the cutter, and the cutter
  • the cooling channel and the core cooling channel may be formed of metal laminates along a central axial direction of the core.
  • the cutter cooling channel is adjacent to the rake face side, which is expressed as a portion where cutting heat is concentrated according to the analysis of the cutting thermal gradient of the cutter.
  • a boundary or limit line of the passage cross section may be disposed there is.
  • the cutter cooling channel is expressed as a portion in which cutting heat is concentrated according to the cutting thermal gradient analysis of the cutter at a portion adjacent to the rake face side, and the thermal gradient is rapidly inclined. So as to be adjacent to A boundary or limit line of the passage cross-section may be placed.
  • the cutter cooling channel is expressed as a portion in which cutting heat is concentrated according to the cutting thermal gradient analysis of the cutter at a portion adjacent to the rake face side, and the thermal gradient is rapidly inclined. So as to be adjacent to A boundary or limit line of the passage cross section may be arranged corresponding to the isotherm of the thermal gradient.
  • the cutter has a rake face corresponding to the cutting surface and a flank face corresponding to the guide of cutting chips, and the cutter cooling channel has a higher flow rate towards the rake face than the flank face It can be arranged to provide.
  • the cutter cooling channel may include a plurality of rake capillary channels extending from the connection channel toward the rake face; and a plurality of flank capillary channels extending from the connection channel toward the flank face.
  • connection channel is formed radially from the core cooling channel toward the flank face side, and the rake cap channel in the connection channel is disposed inclined toward the rake face side, and the connection channel In, the flank capillary channel may be disposed inclined toward the flank face.
  • two or more rake capillary channels may be disposed, and one or more flank capillary channels may be disposed.
  • the rake capillary channel may have a wider channel width than the flank capillary channel.
  • the cutter, the cutter cooling channel, and the connection channel are provided in a plurality of spiral shapes along the outer circumferential surface of the core part, the core part, the cutter, the cutter cooling channel, the connection channel, and
  • the core cooling channel may be formed of a metal laminate along a central axial direction of the core.
  • the effect of the present invention according to the configuration as described above is to apply 3D printing technology to a cutting tool to form a cutting channel as close as possible to the cutting edge of the cutting tool, thereby sufficiently increasing the cooling performance of the cutting edge compared to conventional cutting tools.
  • the present invention provides a cutting tool having a cooling passage inside the tool capable of increasing cutting precision, stability, and productivity in high-speed machining.
  • FIG. 1 is a front view of a cutting tool having a cooling passage inside the tool according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1 .
  • FIG. 3 is a heat transfer analysis diagram showing a cutting heat gradient in a portion where cutting heat is concentrated in an existing cutting tool to which a cutter cooling channel according to an embodiment of the present invention is applied.
  • FIG. 4 is a front view of a cutting tool having an internal cooling passage having a porous structure according to another embodiment of the present invention.
  • FIG. 5 is a cross-sectional view taken along line I-I of FIG. 4 .
  • An embodiment of the present invention provides a cutting tool having a cooling passage inside the tool.
  • a cutting tool having a cooling passage inside the tool according to an embodiment of the present invention includes a core part; A cutter provided on the outside of the core part; and a cutter cooling channel positioned adjacent to a cutting surface of the cutter in the cutter, wherein the cutter cooling channel is formed in the cutter as the core portion and the cutter are formed by metal 3D printing.
  • FIG. 1 is a front view of a cutting tool having an internal cooling passage according to an embodiment of the present invention
  • FIG. 2 is a cross-sectional view taken along line I-I of FIG. 1 .
  • a cutting tool 10 having a cooling passage inside the tool includes a core part 11 and a core cooling channel provided in the central part of the core part 11 ( 15), and a cutter 20 provided outside the core portion 11, and a cutter cooling channel 25 positioned adjacent to the cutting surface of the cutter 20 in the cutter 20.
  • the core part 11 is formed as a central structure of a tool to which the cutter 20 is coupled, and is a hollow structure in which a core cooling channel 15 penetrating the central part in the longitudinal direction is formed.
  • the core cooling channel 15 is a passage through which a cooling fluid such as cutting oil for cooling the core part 11 is supplied, but is presented in a circular cross-sectional shape as shown, but is not limited thereto, and makes the heat exchange area larger. It may have a concavo-convex shape for
  • the cooling fluid flows along the center line of the core part 11.
  • a fluid or gas used to cool the core part 11 by exchanging heat with the core part 11 while passing through the core cooling channel 15 may be used.
  • the cutter 20 is formed on the core part 11 at regular intervals to cut an object to be cut, and has an edge part 21 that is sharply processed and heat treated for cutting.
  • the cutter 20 may have a spiral structure disposed at 90 degree or 180 degree intervals on the outside of the core part 11 provided in the shape of an end mill, but is not limited thereto, and may be arranged at smaller angular intervals. do.
  • the cutter cooling channel 25 is provided in a plurality of spiral shapes along the outer circumferential surface of the core portion 11 together with the cutter 20 inside the cutter 20 .
  • the cutter cooling channel 25 is a spiral passage in which a cavity is formed in the spiral direction of the cutter 20 corresponding to the shape of the cutter 20, and the cooling fluid supplied during cutting flows in the spiral direction.
  • the core cooling channel 15 and the cutter cooling channel 25, as separate structures, may be formed of a metal laminate along the central axial direction of the core portion 11.
  • the core part 11, the core cooling channel 15, the cutter 20, and the cutter cooling channel 25 are formed at the same time as metal used as a tool is laminated and formed by 3D printing.
  • the core cooling channel 15 is a straight structure and may be formed by drilling, but it is appropriate to form it together during metal lamination of 3D printing as described above in terms of saving later processing work.
  • the cutter cooling channel 25 provided in the cutter 20 is formed to have a cross-sectional structure corresponding to the shape of the cutter 20, and has a complicated cross-section and spiral arrangement similar to the shape of the cutter 20 without relying on metal lamination. is impossible, but it is possible enough with the 3D printing method, which is 3D printing.
  • the cutter 20 has a rake face 22 corresponding to the cutting surface and a flank face 23 corresponding to the guide of cutting chips.
  • the rake face 22 has a concave curved shape
  • the flank face 23 has a bulging curved shape
  • the rake face 22 and the flank face 23 meet at the cutting edge 21 to form a cutting edge shape .
  • the flank face 23 serves to discharge the cut chips to the outside of the cutting surface, and frictional heat is reduced compared to the rake face 22 .
  • the cutter cooling channel 25 is disposed closer to the rake face 22 than the flank face 23, and facilitates cooling of the rake face 22, where frictional heat is mainly generated in cutting.
  • the fact that the cutter cooling channel 25 is disposed adjacent to the rake face 22 rather than the flank face 23 is advantageous in terms of protecting the tool from heat generated during cutting and preventing thermal deformation of the cutting surface.
  • the cutter cooling channel 25 may have a cross-sectional shape extending from the edge portion 21 of the cutter 20 toward the boundary between the core portion 11 and the cutter 20 .
  • the structure extending from the edge portion 21 side of the cutter cooling channel 25 to the core side creates a pressure difference according to a flow velocity difference from the boundary side between the core portion 11 and the cutter 20 to the edge portion 21 side.
  • the cooling fluid can be easily supplied to the edge portion 21 to cool the edge portion 21, and compared to a conventional cutting tool in which cooling fluid is supplied from the core portion 11 side, to the edge portion 21
  • the cooling performance is significantly improved.
  • the cutter cooling channel 25 may have a cross-sectional shape obtained by reducing the shape of the cutter 20 .
  • the cross-sectional thickness T1 between the rake face 22 of the cutter 20 and the cutter cooling channel 25 may be less than 1/5 of the core diameter (diameter of the dotted line).
  • the outer cross-sectional thickness T1 of this cutter cooling channel 25 is used as a thickness dimension for making the cutter cooling channel 25 the maximum size corresponding to the shape of the cutter 20 while preventing damage to the cutter 20.
  • the thickness of the cross section between the rake face 22 of the cutter 20 and the cutter cooling channel 25 must be about 2 mm to maintain the shape of the cutter 20 in cutting. there is.
  • the cross-sectional thickness T2 between the flank face 23 of the cutter 20 and the cutter cooling channel 25 is the cross-section between the rake face 22 of the cutter 20 and the cutter cooling channel 25 It may be formed between 1.5 and 3 times the thickness T1.
  • the rake face 22 of the cutter 20 and the cutter cooling channel 25 can be set to between 3 mm and 6 mm.
  • the cutter cooling channel 25 and the core cooling channel 15 may be coated and heat treated for corrosion and rigidity enhancement after metal lamination internally.
  • FIG. 3 is a heat transfer analysis diagram showing a cutting heat gradient in a portion where cutting heat is concentrated in an existing cutting tool to which a cutter cooling channel according to an embodiment of the present invention is applied.
  • the cutting tool is interpreted as a high temperature in the portion adjacent to the edge portion of the rake face, and a relatively low portion adjacent to the edge portion in the flank face on the opposite side. interpreted as temperature. This can be known through the temperature distribution and isothermal line displayed for each color.
  • the area adjacent to the box marked T side on the rake face side is a portion where cutting heat is concentrated, and the cutting heat is expressed as a thermal gradient in which the temperature decreases along the inside of the cutter, the flank face, and the rake face.
  • the cutter cooling channel 25 is more It is arranged so as to be close to the T side area adjacent to the rake face 22 side.
  • the cutter cooling channel 25 is arranged so that the limit line of the cooling passage is as close as possible to points 1 and 2 in the T side region.
  • the limit line of the cross section of the flow path of the cutter cooling channel 25 is capable of maintaining the rigidity of the cutter 20 to prevent breakage and deformation of the rake face 22 side, that is, of the rake face 22 and the cutter cooling channel 25 If an appropriate thickness is provided, it can be sufficiently extended to the area adjacent to the T side area.
  • the boundary or limit line of the passage section adjacent to the edge portion 21 in the cutter 20 of the cutter cooling channel 25 is a curve, straight line, or fine line similar to the orange isotherm between red and yellow in FIG. It may be provided in a shape including concave-convex lines.
  • the cutter cooling channel 25 is adjacent to the rake face 22 side rather than the flank face 23 so as to sufficiently absorb heat in the red and orange regions included in the yellow box line outside the T side region. It is formed including a passage cross section corresponding to (20).
  • FIG. 4 is a front view of a cutting tool having a porous internal cooling passage according to another embodiment of the present invention
  • FIG. 5 is a cross-sectional view taken along line I-I of FIG. 4 .
  • a cutting tool 100 having an internal cooling passage having a porous structure includes a core part 101 and a core cooling provided in the central part of the core part 101.
  • the channel 105, the cutter 120 provided on the outside of the core part 101, the cutter cooling channel 125 provided on the cutter 120 and extending to the outer surface of the cutter 120, and the core cooling channel 105 It includes a connecting channel 130 connecting the cutter cooling channel 125.
  • the core part 101 is formed as a central structure of a tool to which the cutter 120 is coupled, and is a hollow structure in which a core cooling channel 105 penetrating the central part in the longitudinal direction is formed.
  • the core cooling channel 105 is a passage through which a cooling fluid such as cutting oil for cooling the core part 101 is supplied, and is presented in a circular cross-sectional shape as shown, but is not limited thereto, making the heat exchange area larger. It may have a concavo-convex shape for
  • the cooling fluid flows along the center line of the core part 101 .
  • a fluid or gas used to cool the core part 101 by exchanging heat with the core part 101 while passing through the core cooling channel 105 may be used.
  • the cutter 120 is formed at regular intervals on the core part 101 to cut an object to be cut, and has an edge part 121 processed sharply for cutting and subjected to heat treatment.
  • the cutter 120 may have a spiral structure arranged at 90 degree or 180 degree intervals on the outside of the core part 101 provided in the shape of an end mill, but is not limited thereto, and may be arranged at smaller angular intervals. do.
  • the cutter cooling channel 125 and the connecting channel 130 are connected to the core cooling channel 105 in the center of the core part 101, along the spiral shape of the cutter 120 from the outside of the core part 101. are placed
  • the cutter cooling channel 125 and the connecting channel 130 correspond to the shape of the cutter 120 in the core cooling channel 105 as a spiral arrangement passage formed with a fine passage or a thin slit in the direction of the cutter 120,
  • the cooling fluid supplied to the case cools the cutter 120 while flowing in the radial direction in the core part 101 .
  • the core cooling channel 105 , the cutter cooling channel 125 , and the connection channel 130 are connected structures and may be formed of metal laminates along the central axial direction of the core unit 101 .
  • the core part 101, the core cooling channel 105, the cutter 120, the cutter cooling channel 125, and the connection channel 130 are formed simultaneously while layering metal used as a tool by 3D printing.
  • the core cooling channel 105 is a straight structure and may be formed by drilling, but it is appropriate to form it together during metal lamination of 3D printing as described above in terms of saving later processing work.
  • the cutter cooling channel 125 provided in the cutter 120 is formed to have a cross-sectional structure corresponding to the shape of the cutter 120, and the formation of a complicated micro-passage in the shape of the cutter 120 is possible without relying on metal lamination. impossible.
  • the cutter 120 has a rake face 122 corresponding to the cutting surface and a flank face 123 corresponding to the guide of cutting chips.
  • the rake face 122 has a concave curved shape, and the flank face 123 has a bulging curved shape, and the rake face 122 and the flank face 123 meet at the cutting edge 121 to form a cutting edge shape .
  • the flank face 123 serves to discharge the cut chips to the outside of the cutting face, and frictional heat is reduced compared to the rake face 122.
  • the cutter 120 has a rake face 122 corresponding to the cutting surface and a flank face 123 corresponding to the guide of the cutting chips, but the cutter cooling channel 125 has a rake face 122 more than the flank face 123. ) side to provide more flow.
  • the cutter cooling channel 125 is arranged so that more cooling fluid flow rate is supplied to the rake face 122 side than the flank face 123, so that the rake face 122 side, where frictional heat is mainly generated in cutting, is smoothly cooled.
  • the fact that more cutter cooling channels 125 are disposed on the side of the rake face 122 than the flank face 123 is advantageous in terms of protecting the tool from heat generated during cutting and preventing thermal deformation of the cutting surface.
  • the cutter cooling channel 125 includes a plurality of rake capillary channels 126 extending from the connecting channel 130 toward the rake face 122 side, and a plurality of rake capillary channels 126 extending from the connecting channel 130 toward the flank face 123 side.
  • a flank capillary channel 127 may be included.
  • Two or more rake capillary channels 126 may be disposed, and one or more flank capillary channels 127 may be disposed.
  • two or more rake capillary channels 126 may be disposed, and one or more flank capillary channels 127 may be disposed.
  • three rake capillary channels 126 may be disposed, and three flank capillary channels 127 may be disposed.
  • the rake capillary channel 126 may have a longer channel length than the flank capillary channel 127 and may have a wider channel width than the flank capillary channel 127 .
  • the rake capillary channel 126 is longer and wider than the flank capillary channel 127, more cooling fluid is supplied to the rake face 122 side where more cutting heat is generated than the flank face 123.
  • cutter cooling channel 125 is arranged so that a larger cooling flow rate is supplied to the rake face 122 side than the flank face 123, the rake face 122 where frictional heat is mainly generated in cutting It makes side cooling smooth.
  • cutter cooling channel 125 supplies more cooling flow to the rake face 122 than to the flank face 123, it is advantageous in terms of protecting the tool from heat generated during cutting and preventing thermal deformation of the cutting surface. .
  • connection channel 130 is formed radially from the core cooling channel 105 toward the flank face 123 side, and the rake cap channel 126 in the connection channel 130 is inclined toward the rake face 122 side, ,
  • the flank capillary channel 127 may be disposed inclined toward the flank face 123.
  • connection channel 130 the inclined arrangement of the rake capillary channel 126 and the flank capillary channel 127 reduces the flow resistance of the cooling fluid and provides a larger cooling area than the horizontal structure for the connection channel 130, , so that the cooling fluid can be sufficiently supplied to the edge portion 121 side.
  • edge part 22 rake face
  • edge portion 122 rake face
  • flank face 125 cutter cooling channel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un outil de coupe avec outil à l'intérieur de passages de refroidissement. L'outil de coupe avec outil à l'intérieur de passages de refroidissement, selon un mode de réalisation de la présente invention, comprend : une partie centrale ; un dispositif de coupe disposé sur l'extérieur de la partie centrale ; et des canaux de refroidissement de dispositif de coupe situés dans le dispositif de coupe adjacent à la face de coupe du dispositif de coupe, les canaux de refroidissement de dispositif de coupe étant formés dans le dispositif de coupe en tant que partie centrale et le dispositif de coupe étant formé par impression 3D métallique.
PCT/KR2021/015045 2021-10-25 2021-10-25 Outil de coupe avec outil à l'intérieur de passages de refroidissement WO2023074921A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2021-0142342 2021-10-25
KR1020210142342A KR102611096B1 (ko) 2021-10-25 2021-10-25 다공성 구조의 내부 냉각 유로 가지는 절삭공구
KR1020210142333A KR102582433B1 (ko) 2021-10-25 2021-10-25 공구 내부 냉각유로를 가지는 절삭공구
KR10-2021-0142333 2021-10-25

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WO2023074921A1 true WO2023074921A1 (fr) 2023-05-04

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PCT/KR2021/015045 WO2023074921A1 (fr) 2021-10-25 2021-10-25 Outil de coupe avec outil à l'intérieur de passages de refroidissement

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120002998A (ko) * 2009-04-26 2012-01-09 이스카 엘티디. 절삭 공구 및 그러한 절삭 공구를 제조하기 위한 공정
US20190224761A1 (en) * 2018-01-23 2019-07-25 Matsuura Machinery Corporation Cutting Tool
US20190224760A1 (en) * 2018-01-23 2019-07-25 Matsuura Machinery Corporation Cutting Tool
US20200282475A1 (en) * 2019-03-07 2020-09-10 Kennametal Inc. Rotary cutting tool with internal coolant passage
US10814406B1 (en) * 2019-04-24 2020-10-27 Raytheon Technologies Corporation Internal cooling passages for rotating cutting tools

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120002998A (ko) * 2009-04-26 2012-01-09 이스카 엘티디. 절삭 공구 및 그러한 절삭 공구를 제조하기 위한 공정
US20190224761A1 (en) * 2018-01-23 2019-07-25 Matsuura Machinery Corporation Cutting Tool
US20190224760A1 (en) * 2018-01-23 2019-07-25 Matsuura Machinery Corporation Cutting Tool
US20200282475A1 (en) * 2019-03-07 2020-09-10 Kennametal Inc. Rotary cutting tool with internal coolant passage
US10814406B1 (en) * 2019-04-24 2020-10-27 Raytheon Technologies Corporation Internal cooling passages for rotating cutting tools

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