WO2009130821A1 - 深穴切削用スローアウェイチップ及び深穴切削用ドリルヘッド - Google Patents
深穴切削用スローアウェイチップ及び深穴切削用ドリルヘッド Download PDFInfo
- Publication number
- WO2009130821A1 WO2009130821A1 PCT/JP2008/072628 JP2008072628W WO2009130821A1 WO 2009130821 A1 WO2009130821 A1 WO 2009130821A1 JP 2008072628 W JP2008072628 W JP 2008072628W WO 2009130821 A1 WO2009130821 A1 WO 2009130821A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cutting
- cutting edge
- head
- deep hole
- blade
- Prior art date
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Classifications
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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
- B23B51/04—Drills for trepanning
- B23B51/0486—Drills for trepanning with lubricating or cooling equipment
- B23B51/0493—Drills for trepanning with lubricating or cooling equipment with exchangeable cutting inserts, e.g. able to be clamped
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/141—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness
- B23B27/145—Specially shaped plate-like cutting inserts, i.e. length greater or equal to width, width greater than or equal to thickness characterised by having a special shape
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/04—Overall shape
- B23B2200/0423—Irregular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/28—Angles
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
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- 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
- Y10T408/892—Tool or Tool with support with work-engaging structure detachable from cutting edge
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- 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
- Y10T408/905—Having stepped cutting edges
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- 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
Definitions
- the present invention relates to a deep hole cutting throw-away tip having three-fold symmetry and a deep hole cutting drill head using the throw-away tip.
- the drill head 50 has a substantially cylindrical shape having a hollow portion 52 in which the head main body 51 is open to the proximal end side.
- the head portion 51a of the substantially obtuse conical head forms a substantially sector shape with a central angle of 90 ° and is a hollow portion.
- 52 has two large and small chip discharge ports 53A and 53B communicating with 52, and the central side blade body 54A and the peripheral side blade body 54B are small on the opening side edge along the head radial direction D of the large chip discharge port 53A.
- An intermediate blade 54C is formed at the opening side edge along the same head radial direction D of 53B by screwing the throw-away tip 60 to the recessed mounting seat on the head main body 51 side.
- guide pads 55A to 55D are screwed to the distal end side, and a male screw 56 is engraved on the proximal end side.
- the base side of the drill head 50 is screwed and attached to the tip of a hollow boring bar (not shown) with a male screw 56, and the boring bar is connected to a drive shaft such as a spindle of a machine tool. Then, by rotating the work material side or conversely, the work material is cut by the cutting blades 54A to 54C to form a deep hole.
- the relative rotation direction of the drill head 50 is the counterclockwise direction in FIG.
- coolant is supplied to the cutting site at a high pressure through the gap between the cutting hole and the boring bar, and flows into the hollow portion 52 from the chip discharge ports 53A and 53B together with the chips generated at the cutting site. Drain outside through the bar.
- the throw-away tip 60 in this case has a hexagonal thick plate shape, has a three-fold symmetry in which the section shape when the section is divided into three at a central angle of 120 degrees, and an adjacent inner cutting edge 62 having a short blade length.
- the outer cutting edge 61 having a long blade length constitutes one unit of a chevron blade portion. That is, each throw-away tip 60 is attached by a fixing bolt 63 passed through a bolt insertion hole provided in the center so that one angled blade portion faces the front end of the head body as a cutting blade, but the angled blade portion is worn.
- the mounting posture can be turned 120 ° to allow the new angled blade part to face the front end, so that the blade tip can be renewed and used three times for longer life.
- Patent Document 1 An advantage (Patent Document 1).
- the center-side blade body 54A responsible for cutting the central portion of the cutting hole has a diameter centered on the head axis O at the cutting edge. It is necessary to accurately position and attach so that the inner end 62a of the inner cutting edge 62 is positioned slightly beyond the head axis O in line with the line D.
- the cutting speed is theoretically zero at the head axis O during cutting, the cutting edge portion at the position of the axis O does not work as a so-called chisel edge, and the workpiece is crushed. As a result, the thrust resistance is loaded, which is a factor that prevents the cutting efficiency from being increased.
- a deep hole that uses a throw-away tip that has two-fold symmetry as a blade body that is, a parallelogram thick plate shape, has cutting edges on two opposite sides, and can be used twice for convenience when the blade edge is updated by 180 ° rotation.
- the inventor first provided an immersion portion on the chip side surface on the inner edge side of the cutting blade, and arranged the inner edge of the cutting blade away from the head axis, thereby preventing the cutting tool from being near the axis.
- a cutting zone is formed, and a non-cutting core of a work material generated in the non-cutting zone is broken by pressing against the inclined stepped portion of the immersion portion (Patent Documents 2 and 3).
- the two-fold symmetry throw-away tip 60 when the inner edge of the cutting blade is arranged away from the head axis, the two-fold symmetry throw-away tip 60 is used.
- the non-cutting core of the work material generated in the non-cutting zone cannot be broken, and the non-cutting core grows long and deteriorates chip discharge performance. Therefore, it was applicable only to the normal full cutting method.
- the present invention provides a three-fold symmetrical deep hole cutting throw-away tip that can be applied to both a full cutting method and a non-cutting core break-off method as a central blade body of a drill head.
- An object of the present invention is to provide a drill head for deep hole cutting using a throw-away tip.
- the throw-away tip for deep hole cutting according to the invention of claim 1 is divided into three sections P1 to P3 when the center angle is 120 degrees. It is a thick plate shape with three-fold symmetry having the same shape, and the cutting edge 1 facing the drilling direction when mounted on the drill head D1 (see FIGS. 2 to 4) and D2 (see FIG. 5) has a cutting length.
- the short inner cutting edge 11 and the outer cutting edge 12 having a long blade length form a chevron corresponding to the first section (first section P1), and the outer cutting edge 12 has a crest side in the chevron having a small outer cutting edge angle ⁇ 1.
- the outer cutting edge portion 12a and the outer knives side outer cutting edge portion 12b having a large outer cutting edge angle ⁇ 2 are constituted by two continuous cutting edge portions.
- a clearance angle ⁇ of the clearance surface 13 along the mountain hem side outer cutting edge portion 12b is set in a range of 5 to 15 degrees. It is supposed to be.
- a margin 14 is formed along the inner cutting edge 11.
- the deep hole cutting drill head according to the invention of claim 5 drills the work material W in cooperation with each other at a plurality of locations including at least the central side and the peripheral side of the tip surface 2a of the cylindrical head body 2.
- the blade bodies 3A to 3C are fixed by screws, and at least the center-side blade body 3A comprises the deep hole cutting throw-away tips T1 and T2 according to the first aspect.
- the center side throw-away tips T1 and T2 are centered on the head axis O as a whole.
- the inner cutting edge 11 in the cutting edge 1 of the first section (first section P1) facing the drilling direction is disposed in parallel with the radial line R and at a position where the center of the cutting edge is located in front of the radial line R in the cutting rotation direction.
- the end 11a is separated from the head axis O and forms a non-cutting zone Z in the vicinity of the axis O.
- the center side throw-away tip T1, T2 (central side blade body 3A) is centered on the head axis O as a whole.
- the inner edge of the inner cutting edge 11 at the cutting edge 1 of the first section (first section P1) facing the drilling direction is disposed at a position where the center is 0.2 to 1.5 mm ahead of the radial line R in the cutting rotation direction. 11a is separated from the head axis O by 0.05 to 0.5 mm.
- the center side throwaway tips T1 and T2 (central side blade body 3A) have the entire cutting edge centered on the head axis O.
- the inner end 11a of the inner cutting edge 11 of the cutting edge 1 of the first section (first section P1) facing the drilling direction is arranged at a position beyond the head axis O along the radial line R.
- the peripheral blade 3B comprises the deep hole cutting throwaway tips T1 and T2 according to the second aspect, and the outer peripheral side of the head.
- the inner cutting edge 11 in the cutting edge 1 of the first section (third section P3) facing the head is arranged in parallel with the head axis O.
- a tenth aspect of the present invention is the deep hole cutting drill head according to any one of the fifth to ninth aspects, further comprising at least three blade bodies 3A to 3C having a central side, a peripheral side, and an intermediate portion,
- the bodies 3A to 3C are constituted by the deep hole cutting throw-away tips T1 and T2 according to any one of claims 1 to 4.
- each of the cutting blades P1 to P3 divided into three portions with three-fold symmetry is divided into the inner cutting blade 11 and the outer cutting blade 12.
- the outer cutting edge 12 is also chevron-shaped by a summit-side outer cutting edge 12a and a skirt-side outer cutting edge 12b, and the clearance angle ⁇ of the flank 13 along the ridge-side outer cutting edge 12b is specified.
- the entire cutting blade is arranged at the center-up position and the first section (the first section facing the drilling direction) If the inner end 11a of the inner cutting edge 11 of the cutting blade of section P1) is separated from the head axis O to form the non-cutting zone Z, the mountain skirt of one section (second section P2) facing the head axis O side The flank 13 along the side outer cutting edge 12b enters the non-cutting zone Z. It takes the form.
- the non-cutting core C generated in the non-cutting zone Z is pressed from the side by the flank 13 and forcibly pushed sideways, and is pushed along with the rotation of the drill heads D1 and D2. Is changed and twisted, and the flank 13 is rolled by the amount that enters the non-cutting zone Z, so that the flank 13 is divided in small increments without growing long. For this reason, good chip discharging performance is ensured during deep hole machining, and high cutting efficiency is obtained in combination with elimination of the chisel edge at the axial center position.
- the throw-away tips T1 and T2 for deep hole cutting can be used as the central blade 3A of the drill head D2 even in the deep hole cutting by the normal full cutting method. That is, generally, the throw-away tip is fitted and screwed into the recessed portion on the head body side via the tip mounting plate, so that the entire cutting edge of the throw-away tip T1, T2 is used as the tip mounting plate 5.
- the inner edge 11a of the inner cutting edge 11 of one section (first section P1) facing the drilling direction along the radial line R centered on the head axis O can be disposed at a position slightly beyond the head axis O. By using it, it can be applied to all cutting methods without any trouble.
- the tip mounting plate 5 having different holding positions for the throw-away tips T1 and T2 is prepared, even with the existing all-cutting-type drill head D2, the original all-cutting method and the non-cutting core break-off method are used. Can be shared.
- the throw hole tips T1 and T2 for deep hole cutting have the margin 14 formed along the inner cutting edge 11, together with the center side blade body 3A of the drill heads D1 and D2, It can also be suitably used as the peripheral blade 3B.
- the inner cutting edge 11 of one section (third section P3) facing the head peripheral side is disposed so as to be parallel to the head rotation axis, and the inner cutting edge 11 is formed as a cutting hole.
- the inner cutting edge 11 is in line contact with the inner periphery.
- the inner cutting edge 11 is increased in edge angle by the margin 14 and the cutting edge is strengthened.
- the margin 14 portion is also in sliding contact with the inner periphery of the hole. The wear of the cutting edge 11 is reduced and damage is unlikely to occur, so that excellent durability can be obtained as the peripheral side blade body 3B in which the linear velocity is increased.
- the deep hole cutting throw-away tips T1 and T2 serve as the central side blade body 3A of the drill head D1 in the non-cutting core break-off method, and are classified into one section (third section).
- the mountain skirt side outer cutting edge portion 12b of one section (second section P2) facing the head axis side is in relation to the head axis O.
- the rear end side is arranged in an inclined state approaching the head axis O, so that the flank side outer cutting edge portion 12b pushes against the non-cutting core C generated in the non-cutting zone Z by the flank 13 thereof.
- the contact becomes more reliable or strong, and the non-cutting core C is efficiently divided in small increments.
- the cutting blades (center side blade body 3A, peripheral side blade body 3B, intermediate portion) are provided at a plurality of locations including at least the center side and the peripheral side of the tip surface 2a of the cylindrical head body 2.
- the deep hole cutting throw-away tip according to claim 1 as at least a central cutting blade body (central blade body 3A). Since T1 and T2 are used, it can be suitably used for deep hole cutting of either the non-cutting core break-off method or the full cutting method depending on the arrangement setting of the throw-away tips T1 and T2 on the center side.
- the inner end 11a of the cutting edge is positioned at the head axis O at the center-side throwaway tip T1, T2 at the center rising position. Since the non-cutting core C generated in the non-cutting zone Z can be efficiently divided in small increments, good chip discharge performance during deep hole cutting is ensured, and the chisel edge at the head axis O position Combined with elimination of this, high cutting efficiency can be obtained.
- the center-up amount of the center throw-away tips T1, T2 and the eccentric amount of the cutting edge inner end 11a are specified. Since the range is set, the small cutting of the non-cutting core C generated in the non-cutting zone Z is more reliably performed.
- the center side throwaway tips T1, T2 are arranged along the radial line R centering on the head axis O in the drilling direction. Since the inner end 11a of the inner cutting edge 11 in one facing section (first section P1) is disposed at a position beyond the head axis O, deep hole cutting by a full cutting method can be performed.
- the deep hole cutting throw-away tips T1 and T2 used in the peripheral blade 3B are the outer periphery of the head.
- the inner cutting edge 11 in the first section (third section P3) facing the side is arranged in parallel with the head axial direction O. Since the inner cutting edge 11 is strengthened by the margin 14, the inner cutting edge 11 Wear is reduced and damage is unlikely to occur, so that excellent durability can be obtained as the peripheral blade 3B having a high linear velocity.
- the deep hole cutting drill heads D1, D2 provided with at least three cutting blade bodies of the central side, the peripheral side, and the intermediate portion, all the cutting blade bodies are the above-mentioned claims 1 to 1. 3 and the throwaway tips T1 and T2 for deep hole cutting described in 3 and these throwaway tips T1 and T2 can be set in the same mounting posture. it can.
- the throw-away tip for deep hole cutting which concerns on 1st embodiment of this invention is shown, (A) is a front view, (B) is a top view, (C) is a right view.
- the drill head for deep hole cutting of the non-cutting core break-up system using the same throwaway tip is shown, (A) is a plan view and (B) is a front view.
- the main part on the front end side of the drill head is shown enlarged, (A) is a plan view and (B) is a longitudinal front view.
- the behavior of the cutting center part in the deep hole cutting by the drill head is shown, (A) is a plan view, and (B) is a longitudinal front view.
- FIG. 1 The main part of the front end side of the full-cutting deep hole cutting drill head using the throw-away tip is shown enlarged, (A) is a plan view and (B) is a longitudinal front view.
- the throw-away tip for deep hole cutting which concerns on 2nd embodiment of this invention is shown, (A) is a front view, (B) is a top view.
- the behavior of the cutting center in deep hole cutting by the non-cutting core break-up type deep hole cutting drill head using the deep hole cutting throw-away tip of the second embodiment is shown, (A) is a plan view (B) is a longitudinal front view.
- the structural example of the conventional drill head for deep hole cutting is shown, (A) Front view, (B) is a front view.
- FIG. 1 shows a throw-away tip T1 for deep hole cutting according to the first embodiment of the present invention
- FIG. 2 shows a drill head D1 of a non-cutting core break-up type using the throw-away tip T1
- FIG. 3 shows the drill head D1.
- 4 shows the behavior of the cutting center in the drill head D1
- FIG. 5 shows the tip side of the full-cutting drill head D2 using the throw-away tip T1 of the first embodiment
- FIG. 6 shows the present invention.
- Throw away tip T2 for deep hole cutting according to the second embodiment and FIG. 7 show the behavior of the cutting center portion in drill head D1 of the non-cutting core break-off method using the throw away tip T2.
- the deep hole cutting throw-away tip T1 of the first embodiment has three-fold symmetry in which the section shapes are equal when the section is divided into three at a central angle of 120 °. In general, it forms a thick plate shape of a substantially equilateral triangle, but each side of the equilateral triangle is bent little by little at two places to be strictly a hexagon. Then, with the entire peripheral edge forming the outline of the nine-sided shape as the cutting edge 1 positioned in the same plane, the main surface facing the cutting edge 1, that is, the front surface in FIG. In addition, a bolt insertion hole 15 that penetrates in the thickness direction is provided in the center of the front surface, and a stepped chip breaker 16 is formed on the rake face 10 along the cutting edge 1 on the entire periphery.
- the throw-away tip T1 of FIG. 1A is shown in a mounting posture to the drill head when the upper side of the paper is the drilling direction, and the horizontal line e passing through the tip top end t represents a plane perpendicular to the drilling direction.
- the three-fold symmetry section form is based on a section by dividing lines p indicated by three virtual lines connecting the center Q and each vertex c in the substantially equilateral triangle, and the upper side in the drawing is the drilling direction.
- the first section P1 that faces the head the second section P2 that faces the right side in the figure toward the head axis side, and the third section P3 that faces the left side in the figure toward the head peripheral side.
- the cutting edge 1 of the first section P1 is responsible for deep hole cutting.
- the mounting posture is set to 120.
- the blade edge 1 of the second section or the third section that is not used is moved to the position of the first section by rotating the blade by 1 degree, so that the blade edge 1 is updated and used three times for convenience.
- Each of the cutting edges 1 of the first to third sections P1 to P3 is arranged on the head axis side in the first section P1 responsible for deep hole cutting, and has a short cutting edge length with an inwardly descending inner cutting edge angle ⁇ .
- the cutting blade 11 and the long outer cutting blade 12 which is also arranged on the head peripheral side and has an outer cutting blade angle of an outward downward slope form a chevron.
- the outer cutting edge 12 is located on the crest (chip top end t) side of the chevron and has a small outer cutting edge angle ⁇ 1 and a ridge-side outer cutting edge 12a having a small outer cutting edge angle ⁇ 1.
- the blade length of the mountain hem side outer cutting blade portion 12b is set shorter than the blade length of the mountain peak side outer cutting blade portion 12a.
- the inner cutting edge 11, the peak top side outer cutting edge part 12a, and the mountain bottom side outer cutting edge part 12b of the first section P1 to the third section P3 each have an equivalent side that is rotationally symmetric about the center Q, and the center Q They are completely overlapped by rotating around 120 °, and the extended line intersection angles of these equivalent sides are all 60 °.
- the portion along the inner cutting edge 11 on the peripheral surface of the chip has a width of about 0.1 to 2 mm and an inclination angle of 1 to 6 ° with respect to the chip thickness direction.
- a margin 14 is formed.
- the clearance angle ⁇ (inclination angle with respect to the chip thickness direction) ⁇ of the clearance surface 13 along each mountain hem side outer cutting edge portion 12b is set to 5 to 15 °, but the clearance angles of other peripheral surfaces of the chip are 10 to 30. It is in the range of °.
- the apex angle of the tip top end t is 130 ° or more, and the inner cutting edge angle ⁇ is larger than the outer cutting edge angle ⁇ 1 of the mountain top side outer cutting edge portion 12a ( ⁇ > ⁇ 1).
- the clearance angle ⁇ of the flank 13 11 °
- the apex angle of the tip apex t 138 °
- the inner cutting edge angle ⁇ 30 °
- the outer cutting edge angle ⁇ 1 12 °.
- the outer cutting edge angle ⁇ 2 18 °.
- the inner cutting edge 11 of the first section P1, the outer hem side outer cutting edge portion 12b of the third section P3, the inner cutting edge 11 of the second section P2, and the first The ridge-side outer cutting edge portion 12b of one section, the inner cutting edge 11 of the third section P3, and the ridge-side outer cutting edge section 12b of the second section P2 are arranged in parallel, and the drill shown in FIG.
- the inner cutting edge 11 of the third section P3 and the mountain hem side outer cutting edge portion 12b of the second section P2 are set along the drilling direction.
- a drill head D1 shown in FIGS. 2A and 2B has a hollow portion 20 on a head distal end surface 2a having a substantially obtuse conical shape of a substantially cylindrical head body 2 having a hollow portion 20 opened on the base end side.
- Two generally large and small fan-shaped chip discharge ports 21 and 22 communicating with each other are formed so as to face each other in the radial direction, and the opening side edge along the radial line R passing through the head axis O of the large chip discharge port 21 is formed.
- the center-side blade body 3A and the peripheral-side blade body 3B, and the intermediate-side blade body 3C on the opening side edge along the radial line R ′ on the opposite side in the radial direction of the small chip discharge port 22 are respectively in the first embodiment.
- the throw-away tip T1 is used, and the throw-away tip T1 of the central blade 3A is arranged in a non-cutting core break-up system.
- Each throw-away tip T1 is screwed in a partially protruding state on one side in the longitudinal direction of one side surface of the substantially square-axis tip mounting plate 5 by a fixing bolt 4 that passes through a bolt insertion hole 15 in the center.
- the chip mounting plate 5 is fitted into a recessed portion 23 provided on the head main body 2 side, and the mounting bolt 6 inserted from the outer peripheral surface 2b of the head main body 2 is screwed into the screw hole 5a of the chip mounting plate 5
- the head body 2 is fixed.
- guide pads 7, 7 made of cemented carbide are screwed to the head outer peripheral surface 2b on the distal end side of the head body 2 on the attachment side of the intermediate blade 3C and the back side of the central blade 3A.
- auxiliary guide pads 8 and 8 are also screwed to the positions opposed to the guide pads 7 and 7 in the radial direction.
- a male screw 24 is formed on the outer peripheral surface 2c of the base end side whose outer diameter is smaller than that of the front end side of the head body 2, and the female screw of a hollow boring bar whose base end side is not shown is used.
- the drill head D1 is connected to the tip of the boring bar by being screwed into the tip.
- Each of the three throwaway tips T1 has a third section in which the outer cutting edge 12 having a long blade length of the first section P1 facing in the drilling direction is highly inclined toward the head axis O side and faces the outer periphery of the head.
- the inner cutting edge 11 is in an attached state along the drilling direction.
- the peripheral blade 3B and the intermediate blade 3C are arranged in such a manner that the cutting edge 1 coincides with the radial lines R and R ′ passing through the head axis O.
- the center-side blade body 3A is in a center-up position where the blade edge 1 is parallel to the radius line R and forward of the cutting direction in the cutting direction by a distance f from the radius line R due to the non-cutting core folding method.
- the inner end 11a of the inner cutting edge 11 of the first section P1 is arranged so as to be separated from the head axis O by a distance s.
- the ridge-side outer cutting edge portion 12b (see FIG. 3B) of the second section P2 facing the head center side of the throw-away tip T1 of the center-side blade body 3A has the head axis O. It is parallel to.
- the inner circumference of the cutting hole, the hollow boring bar, and the drill are rotated while the drill head D1 or the work material W connected to the boring bar described above is rotated.
- the coolant supplied through the gap with the outer periphery of the head D1 is continuously fed to the cutting site, the chips generated at the cutting site are wound around the coolant, and the hollow portion 20 from the chip discharge ports 21 and 22 of the drill head D1. In addition, it is discharged to the outside through the hollow interior of the boring bar.
- the non-cutting core C generated in the non-cutting zone Z is pressed from the side by the flank 13 immediately after generation and is forced to the side, and As the drill head D1 rotates, the direction of pushing is continuously changed and twisted, and the flank 13 is pushed from the side by the amount that enters the non-cutting zone Z, and the radius d is smaller than that of the non-cutting zone Z. Since it is beaten by the circle N, it is divided in small increments without growing long. For this reason, good chip discharging performance is ensured during deep hole machining, and high cutting efficiency is obtained in combination with elimination of the chisel edge at the axial center position.
- the flank 13 along the mountain hem side outer cutting edge portion 12b of the second section P2 facing the head axis side is parallel to the head axis O.
- the pressing contact of the flank 13 with respect to the cutting core C becomes more reliable, and the non-cutting core C can be divided into small pieces efficiently.
- the throw-away tip T1 used for the center side blade body 3A of the drill head D1 is at an appropriate center rising position, and the inner end 11a of the inner cutting edge 11 in the first section P1 is also appropriately separated from the head axis O. It is only necessary that the arrangement accuracy in the head body 2 is not strict, and the manufacturing and processing of the mounting plate 5 and the mounting operation of the throw-away tip T1 are facilitated accordingly.
- the clearance angle of the flank 13 of the mountain hem side outer cutting edge portion 12b is less than 5 °, the cutting function of the mountain hem side outer cutting edge portion 12b in the first section P1 facing the drilling direction is hindered.
- the clearance angle exceeds 15 °, the end edge 13a of the clearance surface 13 is insufficiently inserted into the non-cutting zone Z, and the non-cutting core C is degraded.
- a drill head D2 shown in FIGS. 5A and 5B is a specification of a full cutting method, with respect to the same head body 2 as the above-described drill head D1 of the non-cutting core break-off method.
- the same throw-away tip T1 is attached as all the blades 3A to 3C in the intermediate part, but the radius at which the cutting edge 1 passes through the head axis O in the central blade 3A is the same as that in the peripheral and intermediate blades 3B and 3C. It arrange
- the throw-away tip T1 used in the peripheral blade 3B is arranged in the cutting hole by the inner cutting edge 11 of the third section P3 facing the peripheral side arranged along the drilling direction.
- the inner cutting edge 11 is slidably contacted by line contact.
- the margin 14 portion is also slidably contacted by the inner periphery of the cutting hole. 11 is reduced, wear is less likely to occur, and the peripheral blade 3B having a higher linear velocity exhibits excellent durability.
- the same throw-away tip T1 is used for all the blades 3A to 3C on the central side, the peripheral side, and the middle part, and these are in the same mounting posture, so they are manufactured by standardizing parts and standardizing assembly operations.
- the cost can be greatly reduced, and the outer cutting edge 12 having a long blade length of the first section P1 facing the drilling direction of any of the throw-away tips T1 is highly inclined toward the head axis O side.
- the component force is directed toward the head axis and hardly causes runout, and the drilling accuracy of the cutting hole is improved accordingly.
- the throw-away tip T2 for deep hole cutting according to the second embodiment shown in FIGS. 6A and 6B is roughly a regular triangle, strictly a hexagonal thick plate and has a three-fold symmetry.
- the configuration is substantially the same except for a part of the throw-away tip T1 of the first embodiment, the same reference numerals are given to the common parts with the first embodiment, and the description thereof is omitted.
- the outer cutting edge angles ⁇ 1, ⁇ 2 of the crest-side outer cutting edge portion 12a and the crest-side outer cutting edge portion 12b of each outer cutting edge 12 are larger than those in the first embodiment.
- the inner cutting edge 11 and the first section mountain hem side outer cutting edge section 12b, the third section P3 inner cutting edge 11 and the second section P2 mountain hem side outer cutting edge section 12b are non-parallel to each other.
- the inner cutting edge 11 of the third section P3 is along the drilling direction, while the ridge-side outer cutting edge portion 12b of the second section P2 is the edge of the cutting edge.
- the extension line L2 to the front side in the drilling direction is inclined with respect to the drilling direction so that the extension line L1 of the inner cutting edge 11 intersects the extension line L1.
- the crossing angle ⁇ of the extension lines Ll and L2 is about 5 to 30 °.
- the center cutting edge 3A also has a cutting edge 1 with a radius R as shown in FIGS. 7 (A) and 7 (B).
- the inner end 11a of the inner cutting edge 11 of the first section P1 facing the drilling direction is a distance s from the head axis O as a center rising position parallel to the radial line R and ahead of the cutting rotation direction by a distance f from the radial line R.
- a non-cutting zone Z is formed only apart.
- the non-cutting core C generated in the non-cutting zone Z is pressed from the side by the flank 13 immediately after generation and is forced to the side just like the case of the throw-away tip T1 of the first embodiment.
- the direction in which it is pushed is continuously changed and twisted, and the flank 13 is pushed from the side by the amount that it enters the non-cutting zone Z, resulting in a circle N having a smaller radius d than the non-cutting zone Z.
- the intrusion into the non-cutting zone Z gradually expands due to the inclination of the flank 13, and as the non-cutting core C becomes longer, the degree of displacement from the head axis O to the side increases. Therefore, it cannot grow for a long time, and it is divided more efficiently in small increments.
- the mountain hem side outer cutting edge portion 12b of the second section P2 facing the head center side is inclined with respect to the head axis O, and the flank 13 is inclined.
- the division property of the non-cutting core C can be improved.
- the eccentric distance s from O is preferably in the range of 0.05 to 0.5 mm. If it is too small, positioning of the throw-away tip will be difficult, and conversely if too large, the non-cutting core C will become thick and bend off. Therefore, a large force is required to reduce the cutting efficiency.
- the center f of the center side blade body 3A that is, the distance f of the cutting blade 1 with respect to the radial line R centered on the head axis O is used to make sure that the non-cutting core C can be broken up more accurately.
- a range of 0.2 to 1.5 mm is preferable.
- the illustrated deep hole cutting drill heads D1 and D2 have three blade bodies 3A to 3C on the center side, the peripheral side, and the middle portion, but the present invention is also applicable to drill heads having four or more blade bodies. Applicable to.
- various design changes can be made other than the illustrated ones such as the shape of the chip discharge holes 21 and 22, the shape of the mounting plate 5, and the mounting position and number of guide pads.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
Description
11 内切刃
11a 内端面
12 外切刃
12a 山頂側外切刃部
12b 山裾側外切刃部
13 山裾側外切刃部に沿う逃げ面
14 マージン
15 ボルト挿通孔
2 ヘッド本体
2a 先端面
20 中空部
21,22 切屑排出口
2A 中央部切刃チップ(中心側の切削を担う切刃チップ)
20 刃先縁
20a 内端
3A 中央側刃体
3B 周辺側刃体
3C 中間部刃体
5 取付板
7 ガイドパッド
C 非切削コア
D1 非切削コア折り取り方式の深穴切削用ドリルヘッド
D2 全切削方式の深穴切削用ドリルヘッド
O ヘッド軸心
P1 穿孔方向に臨む第1区分
P2 ヘッド軸心側に臨む第2区分
P3 ヘッド周辺側に臨む第3区分
R 半径線
T1,T2 深穴切削用スローアウェイチップ
W 被削材
Z 非切削ゾーン
f 距離(芯上がり量)
s 距離(離心距離)
α 内切刃角
β1,β2 外切刃角
γ 交叉角
θ 逃げ角
Claims (10)
- 中心角120度で3区分した際の区分形状が等しくなる3回対称性を持つ厚板状であって、ドリルヘッドへの取付状態で穿孔方向に臨む刃先が刃長の短い内切刃と刃長の長い外切刃とで前記1区分に相当する山形をなすと共に、外切刃が外切刃角の小さい前記山形における山頂側外切刃部と外切刃角の大きい山裾側外切刃部との連続した2つの切刃部より構成されてなる深穴切削用スローアウェイチップ。
- 前記山裾側外切刃部に沿う逃げ面の逃げ角が5~15度の範囲に設定されてなる請求項1に記載の深穴切削用スローアウェイチップ。
- 内切刃に沿ってマージンが形成されてなる請求項1に記載の深穴切削用スローアウェイチップ。
- ドリルヘッドへの取付状態でヘッド軸心側に臨む前記1区分の刃先における山裾側外切刃部と、同取付状態でヘッド外周側に臨む前記1区分の刃先における内切刃とが、互いに平行に配置するか、もしくは互いの刃先縁の穿孔方向前方側への延長線が交わるように配置してなる請求項1に記載の深穴切削用スローアウェイチップ。
- 円筒形のヘッド本体の先端面の少なくとも中央側と周辺側とを含む複数箇所にそれぞれ、協働して被削材を穿孔する刃体がねじ止め固着され、少なくとも中央側刃体が前記請求項1に記載の深穴切削用スローアウェイチップからなることを特徴とする深穴切削用ドリルヘッド。
- 前記中央側のスローアウエイチップは、刃先全体がヘッド軸心を中心とする半径線と平行して且つ該半径線よりも切削回転方向前方の芯上がり位置に配置すると共に、穿孔方向に臨む前記1区分の刃先における内切刃の内端がヘッド軸心から離間して該軸心付近に非切削ゾーンを形成する請求項5に記載の深穴切削用ドリルヘッド。
- 前記中央側のスローアウエイチップは、切刃全体がヘッド軸心を中心とする半径線よりも切削回転方向前方へ0.2~1.5mmの芯上がり位置に配置すると共に、穿孔方向に臨む前記1区分の刃先における内切刃の内端がヘッド軸心から0.05~0.5mm離間してなる請求項6に記載の深穴切削用ドリルヘッド。
- 前記中央側のスローアウエイチップは、切刃全体がヘッド軸心を中心とする半径線に沿うと共に、穿孔方向に臨む前記1区分の刃先における内切刃の内端がヘッド軸心を越える位置に配置してなる請求項5に記載の深穴切削用ドリルヘッド。
- 周辺側刃体が前記請求項2に記載の深穴切削用スローアウェイチップからなり、そのヘッド外周側に臨む前記1区分の刃先における内切刃がヘッド軸心と平行に配置してなる請求項5に記載の深穴切削用ドリルヘッド。
- 中央側及び周辺側と中間部との少なくとも3個の刃体を備え、全ての刃体が前記請求項1~4のいずれかに記載の深穴切削用スローアウェイチップからなる請求項5~9のいずれかに記載の深穴切削用ドリルヘッド。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2718547A CA2718547A1 (en) | 2008-04-25 | 2008-12-12 | Throwaway tip for deep-hole drilling and drill head for deep-hole drilling |
EP08874049A EP2272611B1 (en) | 2008-04-25 | 2008-12-12 | Deep-hole boring drill head |
PL08874049T PL2272611T3 (pl) | 2008-04-25 | 2008-12-12 | Głowica wiertarska do wiercenia głębokich otworów |
ES08874049T ES2401532T3 (es) | 2008-04-25 | 2008-12-12 | Cabezal de taladro para taladrado profundo |
KR1020107021401A KR101452197B1 (ko) | 2008-04-25 | 2008-12-12 | 심혈 절삭용 쓰로우 어웨이 팁 및 심혈 절삭용 드릴 헤드 |
CN2008801288042A CN102015170B (zh) | 2008-04-25 | 2008-12-12 | 深孔切削用不重磨刀片及深孔切削用钻头 |
US12/911,437 US8764352B2 (en) | 2008-04-25 | 2010-10-25 | Throwaway tip for deep-hole drilling and drill head for deep-hole drilling |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008115158A JP5078731B2 (ja) | 2008-04-25 | 2008-04-25 | 深穴切削用スローアウェイチップ及び深穴切削用ドリルヘッド |
JP2008-115158 | 2008-04-25 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/911,437 Continuation-In-Part US8764352B2 (en) | 2008-04-25 | 2010-10-25 | Throwaway tip for deep-hole drilling and drill head for deep-hole drilling |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009130821A1 true WO2009130821A1 (ja) | 2009-10-29 |
Family
ID=41216566
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2008/072628 WO2009130821A1 (ja) | 2008-04-25 | 2008-12-12 | 深穴切削用スローアウェイチップ及び深穴切削用ドリルヘッド |
Country Status (11)
Country | Link |
---|---|
US (1) | US8764352B2 (ja) |
EP (1) | EP2272611B1 (ja) |
JP (1) | JP5078731B2 (ja) |
KR (1) | KR101452197B1 (ja) |
CN (1) | CN102015170B (ja) |
CA (1) | CA2718547A1 (ja) |
ES (1) | ES2401532T3 (ja) |
PL (1) | PL2272611T3 (ja) |
PT (1) | PT2272611E (ja) |
RU (1) | RU2010147931A (ja) |
WO (1) | WO2009130821A1 (ja) |
Families Citing this family (16)
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JP2009226560A (ja) * | 2008-03-25 | 2009-10-08 | Yunitakku Kk | ガンドリル |
WO2012157062A1 (ja) * | 2011-05-16 | 2012-11-22 | Nomura Takuji | 深孔切削用ドリルヘッド |
DE102012012980B4 (de) * | 2011-07-22 | 2019-10-17 | Kennametal India Ltd. | Bohrwerkzeug |
DE102012014092B4 (de) | 2011-07-22 | 2020-12-17 | Kennametal India Ltd. | Indexierbarer Bohreinsatz sowie Bohrkörper mit indexierbarem Bohreinsatz |
US9370825B2 (en) | 2011-07-22 | 2016-06-21 | Kennametal India Limited | Indexable drill insert |
CN103447591B (zh) | 2012-05-28 | 2020-02-28 | 钴碳化钨硬质合金印度有限公司 | 四角形的可转位的钻头镶片 |
US10124415B2 (en) | 2013-01-23 | 2018-11-13 | Kennametal India Limited | Indexable drill insert and rotary cutting tool employing same |
WO2015025036A1 (en) * | 2013-08-23 | 2015-02-26 | Bitmovin Gmbh | System and method for session mobility for adaptive bitrate streaming |
SE537475C2 (sv) * | 2013-09-27 | 2015-05-12 | Sandvik Intellectual Property | Långhålsborrverktyg med vinklad fasyta i anslutning till skäreggen |
JP6543956B2 (ja) * | 2015-02-26 | 2019-07-17 | 大同特殊鋼株式会社 | 深孔加工用先端工具 |
CN104772478B (zh) * | 2015-03-20 | 2017-05-03 | 深圳市圆梦精密技术研究院 | 可应用于双金属加工的刀具及该刀具的使用方法 |
CN104772479A (zh) * | 2015-03-20 | 2015-07-15 | 深圳市圆梦精密技术研究院 | 双金属切削专用刀粒及其刀具 |
CN105618799A (zh) * | 2016-03-02 | 2016-06-01 | 苏州勤美达精密机械有限公司 | 一种舍弃式九边形车刀片 |
US10967441B2 (en) * | 2017-03-23 | 2021-04-06 | Allied Machine & Engineering Corporation | Drilling system and modular drilling head for deep hole drilling |
US10384270B1 (en) | 2018-03-08 | 2019-08-20 | Honda Motor Co., Ltd. | Cutting tool |
CN115570185A (zh) * | 2022-11-09 | 2023-01-06 | 山东大学 | 一种大直径复合机夹式深孔钻 |
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- 2008-12-12 CA CA2718547A patent/CA2718547A1/en not_active Abandoned
- 2008-12-12 ES ES08874049T patent/ES2401532T3/es active Active
- 2008-12-12 EP EP08874049A patent/EP2272611B1/en not_active Not-in-force
- 2008-12-12 PT PT88740493T patent/PT2272611E/pt unknown
- 2008-12-12 KR KR1020107021401A patent/KR101452197B1/ko active IP Right Grant
- 2008-12-12 CN CN2008801288042A patent/CN102015170B/zh not_active Expired - Fee Related
- 2008-12-12 RU RU2010147931/02A patent/RU2010147931A/ru unknown
- 2008-12-12 PL PL08874049T patent/PL2272611T3/pl unknown
- 2008-12-12 WO PCT/JP2008/072628 patent/WO2009130821A1/ja active Application Filing
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2010
- 2010-10-25 US US12/911,437 patent/US8764352B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
PT2272611E (pt) | 2013-03-11 |
EP2272611A1 (en) | 2011-01-12 |
EP2272611A4 (en) | 2011-05-18 |
KR20110005239A (ko) | 2011-01-17 |
RU2010147931A (ru) | 2012-05-27 |
JP2009262277A (ja) | 2009-11-12 |
CA2718547A1 (en) | 2009-10-29 |
US20110091296A1 (en) | 2011-04-21 |
CN102015170B (zh) | 2013-01-30 |
EP2272611B1 (en) | 2013-01-09 |
US8764352B2 (en) | 2014-07-01 |
PL2272611T3 (pl) | 2013-05-31 |
KR101452197B1 (ko) | 2014-10-21 |
JP5078731B2 (ja) | 2012-11-21 |
CN102015170A (zh) | 2011-04-13 |
ES2401532T3 (es) | 2013-04-22 |
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