US20110079445A1 - Drill Head for Deep-Hole Drilling - Google Patents

Drill Head for Deep-Hole Drilling Download PDF

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Publication number
US20110079445A1
US20110079445A1 US12/967,831 US96783110A US2011079445A1 US 20110079445 A1 US20110079445 A1 US 20110079445A1 US 96783110 A US96783110 A US 96783110A US 2011079445 A1 US2011079445 A1 US 2011079445A1
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US
United States
Prior art keywords
cutting blade
blade tip
angle
deep
center portion
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
US12/967,831
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English (en)
Inventor
Takuji Nomura
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.)
Unitac Inc
Original Assignee
Unitac Inc
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 Unitac Inc filed Critical Unitac Inc
Assigned to UNITAC, INCORPORATED reassignment UNITAC, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NOMURA, TAKUJI
Publication of US20110079445A1 publication Critical patent/US20110079445A1/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
    • B23B51/04—Drills for trepanning
    • B23B51/0486—Drills for trepanning with lubricating or cooling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels
    • 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
    • B23B51/063—Deep hole drills, e.g. ejector drills

Definitions

  • the present invention relates to a drill head for deep-hole drilling in which a central cutting blade tip is mounted at a center portion, a circumferential cutting blade tip at a circumferential portion and an intermediate cutting blade tip therebetween while facing a cutting chip discharge port opened at a distal end surface of a head main body, and in which an interior of a hollow portion thereof serves as a cutting chip discharge passage communicating with the cutting chip discharge port.
  • FIG. 5 illustrates a deep-hole drilling work state by a conventional deep-hole drilling apparatus. Drilling work is carried out by coupling a proximal end side of a boring bar 41 which holds a drill head 31 at a distal end portion thereof to a spindle of a machine tool or the like via a tool chuck (not shown) to be rotatingly driven or otherwise rotate a work material W.
  • a coolant is supplied in the manner of an external supply system, and a coolant supply jacket 13 encompassing the hollow boring bar 41 oil-tightly is used. While the jacket 13 is press-contacted with the work material W via a seal ring 14 , the coolant C is supplied from an introduction port 15 into the jacket 13 .
  • the coolant C is then supplied to a distal end side of a head main body 32 of the drill head 31 through a gap T between an outer peripheral surface of the boring bar 41 and an inner circumferential surface of a cutting hole H.
  • the coolant C flows from cutting chip discharge ports 34 and 35 of the head main body 32 (see FIG. 6 and FIG. 7) into a cutting chip discharge passage 40 within the boring bar 41 and is discharged outside, together with cutting chips S generated in a cutting region. Further, as shown in FIG. 6 and FIG.
  • the head main body 32 is mounted with a central cutting blade tip 36 at the central portion, a circumferential cutting blade tip 37 at a circumferential portion and an intermediate cutting blade tip 38 therebetween, all of which face the cutting chip discharge ports 34 , 35 opened at a distal end surface 32 a .
  • a reference symbol 16 denotes a guide pad provided to a distal end side on an outer periphery of the drill head 31
  • a reference symbol 17 denotes a clamp groove provided slightly near the middle on the same outer periphery of the drill head 31 .
  • Supply systems of a coolant to a cutting region include an internal supply system (double tube system) such as a so-called ejector system as shown in FIG. 7( b ) other than the external supply system (single tube system) such as a so-called BTA system as shown in FIG. 5 and FIG. 7( a ) as described above.
  • a coolant in the internal supply system is introduced into a coolant supply passage 40 a between outer and inner tubes 42 and 43 at a proximal end side of a double-tube boring bar 41 as shown by arrows in FIG. 7( b ).
  • the coolant flows outside at a distal end side of the boring bar 41 from a coolant discharge port 46 provided on a circumferential wall of the drill head 31 , thereby being supplied to a cutting region side. Together with cutting chips S generated in the cutting region, the coolant is caused to flow from the cutting chip discharge ports 34 and 35 of the drill head 31 into a discharge passage 40 b composed of the inside of the inner tube 43 , and then the coolant is discharged outside.
  • cutting chips S of the work material W which are cut by cutting blade tips 36 to 38 are fragmented into pieces smaller than diameters of the cutting chip discharge ports 34 and 35 of the drill head 31 as shown in FIG. 7( a ) and FIG. 7( b ) and flow from the cutting chip discharge ports 34 and 35 into the inside cutting chip discharge passage 40 or 40 b and then are discharged outside until the drill head 31 penetrates the work material W.
  • FIG. 8( a - 1 ) and FIG. 8( a - 2 ) are front and cross sectional views of a conical disc Sa generated by the central cutting blade tip 36 of the drill head 31 provided with three of central, circumferential and intermediate cutting blade tips 36 to 38 .
  • FIG. 8( b - 1 ) and FIG. 8( b - 2 ) are front and cross sectional views of a toroidal disc Sc generated by the intermediate cutting blade tip 38 .
  • FIG. 8( c - 1 ) and FIG. 8( c - 2 ) are front and cross sectional views of a larger diameter toroidal disc Sb generated by the circumferential cutting blade tip 37 .
  • FIG. 8( d - 1 ) and FIG. 8( d - 2 ) are front and cross sectional views of a hat-shaped disc Sd generated by the central cutting blade tip 36 and the intermediate cutting blade tip 38 and integrally combined by the disc Sa and the disc Sc.
  • the present invention was made in view of the foregoing problem, and an object thereof is to provide a drill head for deep-hole drilling which can fragment cutting chips into small pieces without generating such a disc that clogs a cutting chip discharge port when a head main body of the drill head penetrates a work material, and can discharge the cutting chips from the cutting chip discharge port reliably.
  • a first aspect of the present invention is a drill head for deep-hole drilling comprising a head main body 2 having a rotation axis G extending through a head center portion 24 thereof, cutting chip discharge ports 4 and 5 opened at a distal end surface 2 a of the head main body 2 , a central cutting blade tip 6 mounted at the head center portion so as for a blade edge 6 a thereof to be inclined downwardly and inwardly toward the head center portion, a circumferential cutting blade tip 7 mounted at a circumferential portion so as for a blade edge 7 a thereof to be inclined upwardly and inwardly toward the head center portion, an intermediate cutting blade tip 8 mounted therebetween so as for a blade edge 8 a thereof to be inclined upwardly and inwardly toward the head center portion, the cutting blade tips facing the cutting chip discharge port 4 , 5 , an interior of a hollow portion 3 of the head main body 2 serving as a cutting chip discharge passage communicating with the cutting chip
  • a disc breaker 12 is provided at a head center side end portion of a forward facing flank 8 b of the intermediate cutting blade tip 8 .
  • the forward facing flank 8 b has a major flank surface 21 which is inclined upwardly and inwardly toward the head center portion connected to a minor flank surface 12 which is inclined downwardly and inwardly toward the head center portion.
  • the minor flank surface 12 which constitutes the disc breaker 12 , comprises a truncated distal end surface side of the forward facing flank 8 b .
  • the disc breaker 12 extends along an overlapping region OL where the intermediate cutting blade tip 8 circumferentially overlaps with the central cutting blade tip 6 .
  • the disc breaker 12 extends along an expanded region M which comprises the aforementioned overlapping region OL plus an additional region which extends in a direction away from the head center portion and the rotation axis G.
  • a second aspect is characterized in that the disc breaker 12 is inclined at an angle ⁇ of between 0 to 60 degrees with respect to a plane Q orthogonal to a rotation axis G of the head main body 2 , as seen in FIGS. 2( b ) and 3 .
  • the distal end surface side of the forward facing flank 8 b in the overlapping region OL or in the expanded region M is truncated to form the disc breaker 12 which comprises a surface that is inclined downwardly and inwardly toward the head center portion.
  • the disc breaker 12 which comprises a surface that is inclined downwardly and inwardly toward the head center portion.
  • uncut block pieces to be formed between respective cutting blade tips 6 to 8 and the distal end wall portion of the work material W are fragmented and crushed at the time of penetrating the first work material W 1 . Since the fragmented and crushed cutting chips flow from the cutting chip discharge ports 4 and 5 into the interior cutting chip discharge passage 3 and are discharged outside, clogging of the cutting chip discharge ports 4 and 5 of the head main body 2 is eliminated, and normal cutting is carried out on and after the second work material. Thus, deep-hole drilling work of a plurality of overlaid work materials can be carried out properly.
  • the disc breaker 12 is preferably formed into such an inclined surface that an angle ⁇ with respect to a plane Q orthogonal to a rotation axis G of the head main body 2 in the overlapping region OL or the expanded region M is in the range of 0 to 60 degrees as in the second aspect of the present invention.
  • the angle is below 0 degrees, that is, a negative angle
  • the border between the cutting chip which is cut by the central cutting blade tip 6 and the cutting chip which is cut by the intermediate cutting blade tip 8 is resistant to cutting, and there is a concern of not serving the role as the disc breaker 12 .
  • the angle ⁇ exceeds 60 degrees, a peripheral edge of the disc breaker 12 becomes too acute and may possibly be damaged.
  • FIG. 1( a ) is a front view showing a drill head for deep-hole drilling according to the present invention
  • FIG. 1( b ) is a plan view thereof.
  • FIG. 2( a ) is an enlarged partial view of FIG. 1( a ), and FIG. 2( b ) is a further enlarged partial view thereof.
  • FIG. 3 is an enlarged partial view showing another embodiment of a disc breaker according to the present invention, similar to FIG. 2( b ).
  • FIG. 4( a ) is a perspective view showing the drill head according to the present invention
  • FIG. 4( b ) is a perspective view showing a conventional drill head.
  • FIG. 5 is a longitudinal sectional view showing a deep-hole drilling work state by a deep-hole drilling apparatus provided with the conventional drill head.
  • FIG. 6 is a plan view showing the conventional drill head.
  • FIG. 7 shows the conventional drill head during deep-hole drilling work by a deep-hole drilling apparatus provided with the conventional drill head
  • FIG. 7( a ) is a cross sectional view along an axis direction in a coolant external supply system
  • FIG. 7( b ) is a cross sectional view along an axis direction in a coolant internal supply system.
  • FIG. 8 shows uncut block pieces called discs which are formed by cutting blade tips of the drill head when the drill head penetrates a work material
  • FIGS. 8( a - 1 ) to 8 ( d - 1 ) are front views
  • FIGS. 8( a - 2 ) to 8 ( d - 2 ) are cross sectional views.
  • FIG. 9 is a cross sectional view of a state where a plurality of work materials are overlaid and subjected to deep-hole drilling work.
  • FIG. 1( a ) is a front view showing a drill head 1 for deep-hole drilling according to the present invention
  • FIG. 1( b ) is a plan view thereof
  • FIG. 2( a ) is an enlarged partial view of FIG. 1( a )
  • FIG. 2( b ) is a further enlarged partial view thereof
  • FIG. 3 is an enlarged partial view showing another embodiment of the present invention, similar to FIG. 2( b ).
  • FIG. 4( a ) is a perspective view showing the drill head 1 according to the present invention
  • FIG. 4( b ) is a perspective view showing a conventional drill head.
  • FIG. 1( a ) is a front view showing a drill head 1 for deep-hole drilling according to the present invention
  • FIG. 1( b ) is a plan view thereof
  • FIG. 2( a ) is an enlarged partial view of FIG. 1( a )
  • FIG. 2( b ) is a further enlarged partial
  • the drill head 1 for deep-hole drilling includes a substantially cylindrical head main body 2 having a distal end side formed into a substantially obtuse conical shape.
  • An interior of the head main body 2 forms a hollow portion 3 ( FIG. 1) and a lower end side of the head main body 2 is opened entirely.
  • the substantially obtuse conical distal end surface 2 a of the head main body is formed with a large and a small cutting chip discharge port 4 and 5 radially opposed to each other and communicating with the hollow portion 3 .
  • the central cutting blade tip 6 and the circumferential cutting blade tip 7 are brazed to depressions 9 to 11 provided to the head respectively, whereas at an opening edge along the head diameter direction of the small cutting chip discharge port 5 , the intermediate cutting blade tip 8 is brazed to depressions 9 to 11 provided to the head.
  • the central cutting blade tip 6 is mounted so as for a blade edge 6 a thereof to be inclined downwardly and inwardly toward the head center portion 24 .
  • a forward facing flank 6 b is also inclined downwardly and inwardly toward the head center portion 24 .
  • the circumferential cutting blade tip 7 is mounted so as for a blade edge 7 a thereof to be inclined upwardly and inwardly toward the head center portion 24 , and thus a forward facing flank 7 b is also inclined upwardly and inwardly toward the head center portion 24 .
  • the intermediate cutting blade tip 8 is mounted so as for a blade edge 8 a thereof to be inclined upwardly and inwardly toward the head center portion 24 in the same manner as the circumferential cutting blade tip 7 , and thus a major flank surface 21 of a forward facing flank 8 b is also inclined upwardly and inwardly toward the head center portion 24 .
  • reference symbols 6 c , 7 c and 8 c denote cutting faces
  • reference symbols 6 d , 7 d and 8 d denote cutting chip breakers.
  • reference symbol G denotes a rotation axis of the head main body 2 .
  • the drill head 1 is characterized by the intermediate cutting blade tip 8 having a forward facing flank 8 b , the forward facing flank 8 b comprising a major flank surface 21 associated with the blade edge 8 a connected to a minor flank surface 12 , the minor flank surface 12 being closer to the rotation axis G than the major flank surface 21 and serving as a disc breaker 12 .
  • the disc breaker 12 constitutes a truncated portion of the forward facing flank 8 b along at least an overlapping region OL where the intermediate cutting blade tip 8 circumferentially overlaps with the central cutting blade tip 6 .
  • the disc breaker 12 comprises a surface that is inclined downwardly and inwardly toward the head center portion 24 , at a head center side end portion of the forward facing flank 8 b of the intermediate cutting blade tip 8 whose major flank surface 21 is inclined upwardly and inwardly toward the head center portion 24 , as seen from FIG. 2( a ) and FIG. 2( b ).
  • the truncated region of the intermediate cutting blade tip 8 is filled in with black and denoted by symbol K.
  • the term disc breaker is used for convenience by the present applicant in order to precisely represent a role as a breaker of transversely fragmenting and crushing discs Sa to Sd ( FIG. 8) which are disc-shaped uncut block pieces formed by the central cutting blade tip 6 , circumferential cutting blade tip 7 , and intermediate cutting blade tip 8 .
  • the forward facing flank 8 b of the intermediate cutting blade tip 8 comprises a major flank surface 21 which is inclined upwardly and inwardly toward the head center portion 24 and a minor flank surface 12 which is inclined downwardly and inwardly toward the head center portion 24 , the minor flank surface serving as the disc breaker.
  • the major flank surface 21 and the minor flank surface 12 meet at a ridge 23 .
  • the disc breaker 12 comprises an inclined surface having an angle ⁇ of 20 degrees with respect to a plane Q orthogonal to the rotation axis G of the head main body 2 in the afore-described overlapping region OL as shown in FIG. 2( b ).
  • an angle ⁇ between the blade edge 8 a which is inclined upwardly and inwardly toward the head center portion 24 and the orthogonal plane Q is 20 degrees.
  • the forward facing flank 8 b of the intermediate cutting blade tip 8 is truncated only in the overlapping region OL where the intermediate cutting blade tip 8 circumferentially overlaps with the central cutting blade tip 6 , to form the disc breaker 12 .
  • the disc breaker 12 is not restricted only to the overlapping region OL.
  • the disc breaker 12 can comprise a surface that extends beyond the overlapping region OL in a direction away from the head center portion 24 .
  • FIG. 3 Such an embodiment is shown in FIG. 3 .
  • the disc breaker 12 extends into an expanded region M which comprises the aforementioned overlapping region OL along with a further region which extends in a direction away from the head center portion 24 and the rotation axis G.
  • the further region may, for example, be about a half to a third of a width of the overlapping region OL).
  • the disc breaker 12 again comprises a surface that is downwardly inclined toward the head center portion 24 from the upwardly inclined major flank surface 21 of the forward facing flank 8 b of the intermediate cutting blade tip 8 .
  • the downwardly and inwardly inclined disc breaker 12 forms an angle ⁇ with respect to the plane Q orthogonal to the rotation axis G of the head main body 2 .
  • angle ⁇ is about 20 degrees.
  • the upwardly and inwardly inclined blade edge 8 a of the intermediate cutting blade tip 8 and the orthogonal plane Q form an angle ⁇ , which in one embodiment is about 20 degrees.
  • FIG. 4( b ) shows a conventional drill head 31 .
  • the central cutting blade tip 36 and the circumferential cutting blade tip 37 of the conventional drill head 31 are of the same structure with the central cutting blade tip 6 and the circumferential cutting blade tip 7 of the drill head according to the present invention, respectively.
  • the intermediate cutting blade tip 38 a is formed such that a blade edge 38 and flank 38 b thereof are upwardly inclined upward from a head periphery end portion to a head center side end portion.
  • the truncated region K at the distal end surface side of the region OL where the intermediate cutting blade tip 8 circumferentially overlaps with the central cutting blade tip 6 is left as is. Accordingly, the cutting chip Sa cut by the central cutting blade tip 6 and the cutting chip Sc cut by the intermediate cutting blade tip 8 are connected in the remaining region K ( FIG. 2( b )) and cannot be broken off.
  • the intermediate cutting blade tip 8 has a forward facing flank 8 b comprising a major flank surface 21 which is upwardly inclined towards the head center portion 24 and connects to a disc breaker 12 (minor flank surface) which is downwardly inclined towards the head center portion 24 .
  • the disc breaker 12 extends on the head center portion side of the intermediate cutting blade tip 8 along either just the overlapping region OL (embodiment of FIGS. 2( a ) and 2 ( b )), or in the region M which includes the region OL and a further region extending in a direction away from the head center portion 24 and the rotation axis G.
  • the border between the cutting chip which is cut by the central cutting blade tip 6 and the cutting chip which is cut by the intermediate cutting blade tip 8 is cut by the disc breaker 12 , and so is the border between the cutting chip which is cut by the central cutting blade tip 8 and the cutting chip which is cut by the circumferential cutting blade tip 7 .
  • uncut block pieces to be formed between respective cutting blade tips 6 to 8 and the distal end wall portion of the work material W are fragmented and crushed when the drill head 1 penetrates the work material W.
  • the fragmented and crushed cutting chips flow from the cutting chip discharge ports 4 and 5 into the interior cutting chip discharge passage 3 to be discharged outside.
  • the afore-described inclined disc breaker 12 is preferably formed such that an angle ⁇ with respect to the plane Q orthogonal to the rotation axis G of the head main body 2 is in the range of 0 to 60 degrees.
  • the angle ⁇ is below 0 degrees, that is, a negative angle
  • the border between the cutting chip which is cut by the central cutting blade tip 6 and the cutting chip which is cut by the intermediate cutting blade tip 8 is resistant to cutting, and there is a concern of not serving the role as the disc breaker 12 .
  • the angle ⁇ exceeds 60 degrees, a periphery edge side of the disc breaker 12 becomes too acute and may possibly be damaged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
US12/967,831 2008-06-23 2010-12-14 Drill Head for Deep-Hole Drilling Abandoned US20110079445A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2008-162752 2008-06-23
JP2008162752A JP2010000581A (ja) 2008-06-23 2008-06-23 深孔切削用ドリルヘッド
PCT/JP2008/072629 WO2009157104A1 (ja) 2008-06-23 2008-12-12 深孔切削用ドリルヘッド

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/072629 Continuation-In-Part WO2009157104A1 (ja) 2008-06-23 2008-12-12 深孔切削用ドリルヘッド

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US20110079445A1 true US20110079445A1 (en) 2011-04-07

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US12/967,831 Abandoned US20110079445A1 (en) 2008-06-23 2010-12-14 Drill Head for Deep-Hole Drilling

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US (1) US20110079445A1 (zh)
EP (1) EP2298478A4 (zh)
JP (1) JP2010000581A (zh)
KR (1) KR20110027655A (zh)
CN (1) CN102036775A (zh)
CA (1) CA2725554A1 (zh)
RU (1) RU2011102434A (zh)
WO (1) WO2009157104A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11278970B2 (en) 2018-10-09 2022-03-22 Milwaukee Electric Tool Corporation Drill bit
US11407039B2 (en) 2018-01-29 2022-08-09 Milwaukee Electric Tool Corporation Drill bit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711115B1 (en) * 2011-05-16 2017-11-22 botek Präzisionsbohrtechnik GmbH Drill head for deep hole cutting

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966349A (en) * 1974-04-03 1976-06-29 Gebrueder Heller Rotating cutter tool
US4149821A (en) * 1976-11-17 1979-04-17 Sandvik Aktiebolag Radially balanced rotary drill
US5860773A (en) * 1994-06-13 1999-01-19 Sandvik Ab Drilling tool with rounded insert support surfaces
US5964553A (en) * 1994-06-13 1999-10-12 Sandvik Ab Drilling tool with internal cavities for chip removal
JP2006239826A (ja) * 2005-03-04 2006-09-14 Yunitakku Kk ドリルヘッド
JP2007216320A (ja) * 2006-02-15 2007-08-30 Yunitakku Kk 深穴加工用ドリルヘッド
JP2007216322A (ja) * 2006-02-15 2007-08-30 Yunitakku Kk ドリルヘッドの製造方法
US7645102B2 (en) * 2005-06-06 2010-01-12 Unitac, Inc. Drill head for deep hole machining
US20100158623A1 (en) * 2008-12-19 2010-06-24 Sandvik Intellectual Property Ab Drill body as well as support pad therefor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE502199C2 (sv) * 1990-12-19 1995-09-11 Sandvik Ab Borrskär med snedställd främre skäregg samt borrverktyg för detta
JP4908900B2 (ja) * 2006-04-07 2012-04-04 ユニタック株式会社 深穴切削装置
JP4943824B2 (ja) * 2006-11-17 2012-05-30 ユニタック株式会社 貫通孔の形成方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966349A (en) * 1974-04-03 1976-06-29 Gebrueder Heller Rotating cutter tool
US4149821A (en) * 1976-11-17 1979-04-17 Sandvik Aktiebolag Radially balanced rotary drill
US5860773A (en) * 1994-06-13 1999-01-19 Sandvik Ab Drilling tool with rounded insert support surfaces
US5964553A (en) * 1994-06-13 1999-10-12 Sandvik Ab Drilling tool with internal cavities for chip removal
JP2006239826A (ja) * 2005-03-04 2006-09-14 Yunitakku Kk ドリルヘッド
US7645102B2 (en) * 2005-06-06 2010-01-12 Unitac, Inc. Drill head for deep hole machining
JP2007216320A (ja) * 2006-02-15 2007-08-30 Yunitakku Kk 深穴加工用ドリルヘッド
JP2007216322A (ja) * 2006-02-15 2007-08-30 Yunitakku Kk ドリルヘッドの製造方法
US20100158623A1 (en) * 2008-12-19 2010-06-24 Sandvik Intellectual Property Ab Drill body as well as support pad therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11407039B2 (en) 2018-01-29 2022-08-09 Milwaukee Electric Tool Corporation Drill bit
US11278970B2 (en) 2018-10-09 2022-03-22 Milwaukee Electric Tool Corporation Drill bit

Also Published As

Publication number Publication date
JP2010000581A (ja) 2010-01-07
RU2011102434A (ru) 2012-07-27
WO2009157104A1 (ja) 2009-12-30
EP2298478A1 (en) 2011-03-23
CA2725554A1 (en) 2009-12-30
CN102036775A (zh) 2011-04-27
KR20110027655A (ko) 2011-03-16
EP2298478A4 (en) 2012-06-13

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NOMURA, TAKUJI;REEL/FRAME:025499/0605

Effective date: 20101211

STCB Information on status: application discontinuation

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