WO2009093764A1 - Insert pour outil de perçage - Google Patents

Insert pour outil de perçage Download PDF

Info

Publication number
WO2009093764A1
WO2009093764A1 PCT/KR2008/000396 KR2008000396W WO2009093764A1 WO 2009093764 A1 WO2009093764 A1 WO 2009093764A1 KR 2008000396 W KR2008000396 W KR 2008000396W WO 2009093764 A1 WO2009093764 A1 WO 2009093764A1
Authority
WO
WIPO (PCT)
Prior art keywords
web thinning
shape
edge
cutting
chisel
Prior art date
Application number
PCT/KR2008/000396
Other languages
English (en)
Inventor
Young Bae Lee
Original Assignee
Yg-1 Co., Ltd
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 Yg-1 Co., Ltd filed Critical Yg-1 Co., Ltd
Priority to PCT/KR2008/000396 priority Critical patent/WO2009093764A1/fr
Publication of WO2009093764A1 publication Critical patent/WO2009093764A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
    • B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
    • B23B51/00035—Spade drills
    • 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
    • B23B2251/50—Drilling tools comprising cutting inserts

Definitions

  • the present invention relates to a drill insert, and more particularly, to a drill insert as an expendable cutting tool detachably coupled to a tip of a drill.
  • a drill insert is classified, depending on its shape, as a spade drill insert, a helical thinning insert, a U-drill insert, and so on.
  • a drill insert is an expendable cutting tool fixedly coupled to a tip of a drill as a cutting tool by screws, and then exchanged with a new one after tens or hundreds of cutting operations.
  • the drill insert functions to bring a chisel in direct contact with a surface of a cutting object during initial cutting operation, to position a center point of the cutting operation, to maintain the center point during the cutting operation, and to cut the cutting object at the center point of the cutting tool.
  • the conventional drill insert will be described with reference to the accompanying drawings.
  • FIG. 1 is a perspective view of a conventional spade drill insert
  • FIG. 2 is a perspective view of the spade drill insert to be coupled to a drill.
  • the conventional spade drill insert includes a body 100 having a predetermined thickness, primary relief surfaces 110 inclined outward to form an apex at a center of one surface, and first and second pentagonal surfaces 101 and 102, race surfaces 120 disposed at portions of the first and second surfaces to cut a cutting object along the primary relief surfaces when the body 100 is rotated, secondary relief surfaces 130 inclined at portions of the primary relief surfaces 110, at which the race surfaces are not disposed, web thinning parts 140 grooved toward the apex of the primary relief surfaces from the race surfaces 120, and fastening holes 150 for fastening the body 100 to a drill 200 using bolts.
  • Reference numeral 160 designates a key way coupled to the drill 200
  • reference numeral 170 designates chip splitters for dividing chips into predetermined sizes.
  • the body 100 has the first and second pentagonal surfaces 101 and 102.
  • the pentagonal shape is formed of a rectangular shape, one long side of which projects to form an apex at its center part.
  • two inclination surfaces about the apex are referred to as the primary relief surfaces 110.
  • the primary relief surfaces 110 are elements constituting cutting edges, and an angle between the primary relief surfaces 110 about the apex is about 140.
  • the race surfaces 120 as grooves are formed at the first and second surfaces 101 and 102 of the body 100 to adjoin to the primary relief surfaces 110. When seen from a side view, the race surfaces 120 have a semi-circular groove shape. Interfaces between the race surfaces 120 and the primary relief surfaces 110 constitute cutting edges 121 for actually cutting a cutting object.
  • the race surfaces 120 are formed only at positions where a cutting object is cut in a rotational direction of the drill 200. That is, each of the first and second surfaces 101 and 102 of the body 100 has one race surface.
  • the secondary relief surfaces 130 are formed at portions of the primary relief surfaces 110 at which the race surfaces 120 are not formed, by cutting corner parts between the upper and lower surfaces of the body 100 adjacent to each other.
  • the secondary relief surfaces 130 have areas that are reduced toward the apex of the primary relief surfaces 110.
  • the secondary relief surfaces 130 are configured to increase a surface area and reduce a contact surface with a wall surface of a hole, thereby more effectively discharging heat generated when the cutting is performed.
  • the web thinning parts 140 are grooved in the race surfaces 120 adjacent to the apex of the primary relief surfaces 110 in a direction toward the apex.
  • the web thinning parts 140 provide spaces for reducing propulsion during the cutting and discharging chips generated from a cutting object.
  • a chisel 141 an edge between the web thinning parts 140 disposed at the first and second surfaces 101 and 102 is referred to as a chisel 141.
  • the chisel 141 is in contact with a surface of a cutting object during the cutting.
  • the chisel 141 is rotated in a state in direct contact with the surface of the cutting object to set a center point of the cutting.
  • a small thickness of the chisel 141 decreases propulsion and facilitates self- centering during the cutting.
  • the conventional drill insert uses a relatively long chisel 141 which relatively increases propulsion, a hole may be enlarged due to bad self-centering.
  • the depth of the web thinning parts 140 should be increased.
  • the large depth of the web thinning parts 140 increases an area thereof, and the increased area reduces the width of the primary relief surfaces 110 supporting the cutting edges 142 of the web thinning parts, thereby failing to maintain sufficient strength during the cutting. As a result, it is difficult to deeply form the web thinning parts 140.
  • the conventional drill insert is manufactured for use on a hard or soft cutting object such that a user must select a hard or soft drill insert depending on the type of the cutting object. Disclosure of Invention
  • a drill insert capable of accomplishing optical web thinning parts depending on difference between a load and a cutting amount according to a distance from a center point of the cutting, and reducing the thickness of a chisel.
  • a drill insert including: a chisel for setting a center point of a hole of a cutting object when the hole is formed; a cutting edge for cutting the cutting object during rotation; multiple web thinning parts disposed at surfaces opposite to each other with the chisel interposed therebetween and minimizing the thickness of the chisel to make the cutting object in point contact with the chisel.
  • chips generated due to a difference of cutting amounts depending on distances from a center point of cutting can be effectively discharged to increase cutting efficiency and reduce damage to a drill insert due to friction with the chips, thereby increasing lifespan of the drill insert.
  • the drill insert of the present invention includes multiple web thinning parts to reduce the thickness of a chisel and facilitate self-centering, thereby reducing propulsion and preventing a hole from being enlarged.
  • the multiple web thinning parts are configured to appropriately cut objects having different hardness, regardless of the hardness of the objects, thereby improving manufacturing and use convenience.
  • FIG. 1 is a perspective view of a conventional spade drill insert
  • FIG. 2 is a perspective view of the space drill insert to be coupled to a drill
  • FIG. 3 is a perspective view of a drill insert in accordance with a first exemplary embodiment of the present invention
  • FIGS. 4 to 7 are views showing edge shapes of a first web thinning part 40 and a second web thinning part 50 of FIG. 2;
  • FIG. 8 is a perspective view of a drill insert in accordance with a second exemplary embodiment of the present invention
  • FIG. 9 is a view of a modified drill insert of in accordance with a second exemplary embodiment of the present invention
  • FIG. 10 is a perspective view of a drill insert in accordance with a third exemplary embodiment of the present invention
  • FIG. 11 is a table representing test conditions and results of the drill insert of the present invention and a conventional drill insert
  • FIG. 12 shows photographs showing fused levels before and after tests using the drill insert of the present invention, products of competitors, and existing goods of our company; [35] FIG.
  • FIG. 13 is a graph in which a product having a dual web thinning part of the present invention, products of competitors, and existing goods of our company; and [36] FIG. 14 is a table representing cutting loads of a drill insert of the present invention, products of competitors, and existing goods of our company. [37] * Description of Major Reference Numerals*
  • a drill insert includes: a chisel for setting a center point of a hole of a cutting object when the hole is formed; a cutting edge for cutting the cutting object during rotation; multiple web thinning parts disposed at surfaces opposite to each other with the chisel interposed therebetween and minimizing the thickness of the chisel to bring the cutting object in point contact with the chisel.
  • FIG. 3 is a perspective view of a drill insert in accordance with a first exemplary embodiment of the present invention.
  • the drill insert in accordance with a first exemplary embodiment of the present invention includes a body 1 having a predetermined thickness, primary relief surfaces 10 inclined outward to form an apex at a center of one surface, and first and second pentagonal surfaces 11 and 12, race surfaces 20 disposed at portions of the first surface 11 and the second surface 12 to cut a cutting object along the primary relief surfaces when the body 1 is rotated, secondary relief surfaces 30 inclined at portions of the primary relief surfaces 10, at which the race surfaces 20 are not disposed, first web thinning parts 40 grooved toward the apex of the primary relief surfaces 10 from the race surfaces 20, fastening holes 60 for fastening the body 1 to a drill using bolts, and second web thinning parts 50 grooved toward the apex of the primary relief surfaces 10 from a portion of the first web thinning part 40.
  • the first and the second surfaces 11 and 12 of the body 1 have a pentagonal shape, and the primary relief surfaces 10 are located about the apex.
  • the primary relief surfaces 10 constitute a cutting edge.
  • race surfaces are disposed as grooves along the first and second surfaces 11 and 12 of the body 1 to be in contact with the primary relief surfaces 10.
  • the race surfaces 20 When seen from a side view, the race surfaces 20 have a semi-circular shape. A cutting object is cut by cutting edges 21, and chips are discharged along the semi-circular grooves provided at the race surfaces 20.
  • the secondary relief surfaces 30 are disposed at the primary relief surfaces 10, at which the race surfaces 20 are not formed, by cutting corners between the first and second surfaces 11 and 12.
  • the secondary relief surfaces 30 have an area that is increased toward the apex of the primary relief surfaces 10 to readily discharge heat therefrom.
  • the first web thinning parts 40 and the second web thinning parts 50 are positioned at the race surfaces 20 adjacent to the apex of the primary relief surfaces in a direction toward the apex.
  • a chisel 51 disposed between the second web thinning parts 50 has a thickness that is less than a thickness in a case in which the second web thinning parts 50 are not formed. Reduction in the thickness of the chisel 51 facilitates positioning of a center point of machining when a hole is formed, thereby reducing propulsion.
  • the first web thinning parts 40 function as a chip pocket to facilitate discharge of chips cut from the second web thinning parts 50, and to distribute a cutting load at a point of the second web thinning parts 50, thereby protecting the chisel 51 to prevent reduction in lifespan.
  • FIGS. 4 to 7 are views showing edge shapes of the first web thinning parts 40 and the second web thinning parts 50 of FIG. 2.
  • edges between the first web thinning parts 40 and the primary relief surfaces 10 have a curved shape with a predetermined radius of curvature, while the second web thinning parts 50 formed at the first web thinning parts 40 formed as grooves toward the chisel 51 have straight edges.
  • a difference in shape of the first web thinning parts 40 and the second web thinning parts 50 is to complement a difference in cutting speed, cutting amount, and moment depending on a distance from the apex to the cutting edge of the thinning part.
  • the thinning parts should have a shape such that the cutting amount of the cutting edge is reduced, the cutting speed is low, and cutting can be stably performed during centering.
  • the thinning parts should have a shape such that the cutting amount of the cutting edge is increased, the cutting speed is high, and cutting can be performed to overcome the moment.
  • the first web thinning parts 40 and the second thinning parts 50 are configured to cut the hard and soft cutting objects, respectively, such that the same drill insert can be used regardless of the hardness of the cutting objects.
  • FIG. 5 is a view of an example in which both the first web thinning parts 40 and the second web thinning parts 50 have a curved shape
  • FIG. 6 is a view of an example in which the first web thinning parts 40 have a straight shape and the second web thinning parts 50 have a curved shape
  • FIG. 7 is a view showing an example in which both the first web thinning parts 40 and the second web thinning parts 50 have a straight shape.
  • the first web thinning parts 40 may have a curved shape such that the second web thinning parts 50 can smoothly function as a chip pocket for discharging chips.
  • FIG. 8 is a perspective view of a drill insert in accordance with a second exemplary embodiment of the present invention.
  • the drill insert in accordance with a second exemplary embodiment of the present invention includes a plurality of web thinning parts 4, 5 and 6.
  • second web thinning parts 5 are formed at first web thinning parts 4 by machining grooves having a predetermined angle using a cutting wheel (not shown). Then, third web thinning parts 6 are formed at portions of the second web thinning parts 5 to have a predetermined angle and a predetermined thickness adjacent to a chisel 51.
  • Edges of the first to third web thinning parts 4, 5 and 6 may have a curved shape or a straight shape as shown in FIGS. 4 to 7.
  • first web thinning parts 4 and the second web thinning parts 5 may have curved edges
  • third web thinning parts 6 may have straight edges.
  • first web thinning parts 4 may have straight edges
  • second web thinning parts 5 may have curved edges
  • third web thinning parts 6 may have straight edges.
  • the edges may also be formed opposite to the above.
  • first web thinning parts 4 and the second web thinning parts 5 may have straight edges or curved edges, respectively, or each of the first and second web thinning parts may have a straight edge and a curved edge with the apex interposed therebetween as shown in another embodiment of the web thinning parts of FIG. 6, that is, a mixed type of the straight edge and the curved edge.
  • the drill insert in accordance with the present invention may include a plurality of web thinning parts, and the web thinning parts may have straight edges, curved edges, or mixed edges such that an appropriate drill insert can be used depending on the kinds of cutting objects.
  • the chisel 51 disposed between the third web thinning parts 6 has a very small thickness, and chips cut by the third web thinning parts 6 are discharged through the second web thinning parts 5 and the first web thinning parts 4. At this time, in order to readily discharge the chips, the second web thinning parts 5 and the first web thinning parts 4 may have curved edges.
  • the web thinning parts having curved edges can readily discharge chips, in comparison with the straight edges, since the chips are rolled along the curved surface in small increments.
  • the second web thinning parts 5 have a cutting amount larger than that of the third web thinning parts 6, and the first web thinning parts 4 have a cutting amount larger than that of the second web thinning parts 5. Therefore, in order to readily discharge the chips during the cutting, the web thinning parts adjacent to the chisel are configured to have an area and a cutting space smaller than that of the web thinning parts away from the chisel.
  • the third web thinning parts 6 have the smallest area and cutting space, and the first web thinning parts 4 have the largest area and cutting space.
  • FIG. 10 is a perspective view of a drill insert in accordance with a third exemplary embodiment of the present invention.
  • the third embodiment in accordance with the present invention includes a body 2 having a different shape.
  • a multiple web thinning parts may be adapted to the drill insert, regardless of the body shape.
  • the first web thinning parts 7 function as chip pockets for discharging chips cut by the second web thinning parts 8 and function to cut the cutting object at their edges.
  • the first web thinning parts 7 have an area larger than that of the second web thinning parts 8.
  • Each of the first web thinning parts 7 and the second web thinning parts 8 may be manufactured to have one selected from curved edges, straight edges, or mixed edges.
  • the second web thinning parts 8 are formed at the first web thinning parts 7 to reduce the thickness of the chisel 9 such that the chisel 9 can be in point contact with a surface of the cutting object.
  • a center point of a hole can be more rapidly set when the hole is formed, it is possible to prevent the hole from being enlarged due to reduction in propulsion.
  • the third embodiment illustrates and describes an indexable insert having two web thinning parts
  • an indexable insert having three web thinning parts can be manufactured as described in the second embodiment, and description thereof will not be repeated.
  • the present invention can employ the multiple web thinning parts regardless of the body shapes, vary cutting conditions using the multiple web thinning parts, and machine a hole more stably.
  • FIG. 11 is a table representing test conditions and results of the drill insert of the present invention and a conventional drill insert.
  • FIG. 12 shows photographs showing fused levels before and after tests using the drill insert of the present invention, products of competitors, and existing goods of our company.
  • FIG. 13 is a graph in which a product having a dual web thinning part of the present invention, products of competitors, and existing goods of our company.
  • FIG. 14 is a table representing cutting loads of a drill insert of the present invention, products of competitors, and existing goods of our company.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention concerne un insert pour outil de perçage comprenant : un ciseau servant à déterminer un point central d'un trou sur un objet de découpe lorsque le trou est usiné; un bord de découpe servant à découper l'objet de découpe pendant sa rotation; et de multiples parties d'amincissement de bande comportant au moins deux bords de découpe placés à l'opposé l'un de l'autre, le trépan étant intercalé entre eux pour amener l'objet de découpe jusqu'au point de contact avec le trépan. Par conséquent, grâce aux multiples parties d'amincissement de bande, il est possible de réduire l'épaisseur du trépan, de réaliser plus facilement un centrage automatique, de réduire la propulsion, et d'augmenter l'efficacité de découpe. De plus, étant donné que les copeaux générés pendant la découpe ont une forme leur permettant d'être efficacement évacués, il est possible de réduire les dégâts dus au frottement contre les copeaux et de prolonger la durée de vie.
PCT/KR2008/000396 2008-01-22 2008-01-22 Insert pour outil de perçage WO2009093764A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/000396 WO2009093764A1 (fr) 2008-01-22 2008-01-22 Insert pour outil de perçage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2008/000396 WO2009093764A1 (fr) 2008-01-22 2008-01-22 Insert pour outil de perçage

Publications (1)

Publication Number Publication Date
WO2009093764A1 true WO2009093764A1 (fr) 2009-07-30

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ID=40901254

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/000396 WO2009093764A1 (fr) 2008-01-22 2008-01-22 Insert pour outil de perçage

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WO (1) WO2009093764A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008733A (zh) * 2012-12-21 2013-04-03 浙江欣兴工具有限公司 一种阶梯钻尖铲钻刀片
CN103008734A (zh) * 2012-12-24 2013-04-03 西南铝业（集团）有限责任公司 一种三角钻头
KR101352493B1 (ko) 2012-10-18 2014-01-17 한국교세라정공(주) 오각형 절삭인서트 및 이를 장착한 절삭공구
WO2018079489A1 (fr) * 2016-10-26 2018-05-03 京セラ株式会社 Outil de coupe et procédé de production de pièce à usinée de coupe
CN110899751A (zh) * 2019-12-10 2020-03-24 盐城市精派组合机床有限公司 一种数控双面u钻缸活塞专用机床

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5615907A (en) * 1979-07-06 1981-02-16 Mitsubishi Metal Corp Coated super hard-metal made spade drill blade
US5423640A (en) * 1992-09-24 1995-06-13 Sandvik Ab Drill
US20070036622A1 (en) * 2005-08-12 2007-02-15 Yg-1 Co., Ltd. Spade drill insert
US20070160437A1 (en) * 2003-01-30 2007-07-12 Kennametal Inc. Drill For Making Flat Bottom Hole

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5615907A (en) * 1979-07-06 1981-02-16 Mitsubishi Metal Corp Coated super hard-metal made spade drill blade
US5423640A (en) * 1992-09-24 1995-06-13 Sandvik Ab Drill
US20070160437A1 (en) * 2003-01-30 2007-07-12 Kennametal Inc. Drill For Making Flat Bottom Hole
US20070036622A1 (en) * 2005-08-12 2007-02-15 Yg-1 Co., Ltd. Spade drill insert

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101352493B1 (ko) 2012-10-18 2014-01-17 한국교세라정공(주) 오각형 절삭인서트 및 이를 장착한 절삭공구
CN103008733A (zh) * 2012-12-21 2013-04-03 浙江欣兴工具有限公司 一种阶梯钻尖铲钻刀片
CN103008734A (zh) * 2012-12-24 2013-04-03 西南铝业（集团）有限责任公司 一种三角钻头
WO2018079489A1 (fr) * 2016-10-26 2018-05-03 京セラ株式会社 Outil de coupe et procédé de production de pièce à usinée de coupe
JP2021059010A (ja) * 2016-10-26 2021-04-15 京セラ株式会社 切削工具及び切削加工物の製造方法
JP7216698B2 (ja) 2016-10-26 2023-02-01 京セラ株式会社 切削工具及び切削加工物の製造方法
CN110899751A (zh) * 2019-12-10 2020-03-24 盐城市精派组合机床有限公司 一种数控双面u钻缸活塞专用机床

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