WO2014069265A1 - クーラント穴付きエンドミル - Google Patents
クーラント穴付きエンドミル Download PDFInfo
- Publication number
- WO2014069265A1 WO2014069265A1 PCT/JP2013/078436 JP2013078436W WO2014069265A1 WO 2014069265 A1 WO2014069265 A1 WO 2014069265A1 JP 2013078436 W JP2013078436 W JP 2013078436W WO 2014069265 A1 WO2014069265 A1 WO 2014069265A1
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- WO
- WIPO (PCT)
- Prior art keywords
- end mill
- bottom blade
- blade
- chip discharge
- rotation direction
- 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
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/28—Features relating to lubricating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/20—Number of cutting edges
- B23C2210/202—Number of cutting edges three
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/24—Overall form of the milling cutter
- B23C2210/246—Milling cutters comprising a hole or hollow in the end face or between the cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/28—Arrangement of teeth
- B23C2210/285—Cutting edges arranged at different diameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2250/00—Compensating adverse effects during milling
- B23C2250/12—Cooling and lubrication
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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
- Y10T407/14—Cutters, for shaping with means to apply fluid to cutting tool
Definitions
- the present invention relates to an end mill with a coolant hole in which a plurality of bottom blades are formed at a tip portion of an end mill body, and a plurality of coolant holes are formed in the end mill body to be opened at the tip portion.
- Patent Document 1 discloses that two of four bottom blades (tip cutting blades) of a four-blade ball end mill. In order to supply coolant (fluid) evenly to all the bottom blades, in which coolant holes (fluid supply holes) are opened on the tip flank of the bottom blade, 3 or 4 chips are discharged. It is proposed that a bottom blade is formed at the tip along the groove (twisted groove) and that the same number of coolant holes as the chip discharge grooves are opened on the tip flank of the bottom blade. Yes.
- Patent Document 2 also discloses a pair of long bottom blades provided near the axis along a pair of first gashes formed symmetrically with respect to the axis, and the pair of long bottoms around the axis.
- a pair of short bottom blades provided along a second gash formed so as to reach the first gash from the outer periphery symmetrically with respect to the axial center at a position 90 ° from the blade,
- a fluid supply hole (coolant hole) that has a pair of openings that open to the flank of the long bottom blade and that is provided vertically through the end mill, and a first gash that has an end on the axis side intersecting each other; While the communication area of the second gash is increased, the four holes with coolant holes having a pair of communication grooves provided to connect the intersections of the first gash and the second gash and the openings of the coolant holes are not provided. End mill with equal bottom edge It has been described.
- the end mill main body is also fed to the front end side for cutting.
- the amount of chips generated by the long bottom blade is increased and chip discharge performance is impaired, so chip clogging is likely to occur. Therefore, as described in Patent Document 1, the same number of coolant holes as the bottom blade are opened on the tip flank of the bottom blade, or as described in Patent Document 2, the intersection of the first and second gashes. It is difficult to ensure good chip discharging performance by the long bottom blade only by providing the communication groove so as to connect the portion and the opening of the coolant hole.
- the present invention has been made under such a background.
- a long bottom blade that extends longer on the inner peripheral side of the end mill body than the other bottom blades is formed at the cutting edge portion at the end of the end mill body.
- a tip end portion of an end mill body rotated around an axis is a cutting blade portion, and an outer periphery of the cutting blade portion has an axial direction.
- a plurality of chip discharge grooves twisted toward the rear side in the end mill rotation direction toward the rear end side are formed at intervals in the circumferential direction, and the outer periphery is formed on the outer side edge of the wall surface of the chip discharge grooves facing the end mill rotation direction.
- Each of the blades is formed, and a gash is formed at the tip of the chip discharge groove, and the outer peripheral blade is formed at a cross ridge line portion between a wall surface facing the end mill rotation direction of the gash and a tip flank of the end mill body.
- Bottom blades extending from the front end of the end mill to the inner peripheral side of the end mill body are formed, and at least one of the bottom blades has an end mill rotation direction side and an end mill rotation direction rear side.
- a long bottom blade extending longer to the inner peripheral side of the end mill body than the other two bottom blades adjacent to each other, and between the chip discharge grooves adjacent to each other in the circumferential direction in the end mill body.
- a coolant hole is formed in each of the coolant holes, and among these coolant holes, a chip discharge groove connected to the gash in which the long bottom blade is formed, and a chip discharge groove adjacent to the rear side in the end mill rotation direction of the chip discharge groove, A coolant hole that passes between the two ends of the long bottom blade is opened at a tip clearance surface that is continuous to the rear side in the end mill rotation direction, and a chip discharge groove that is connected to the gash in which the long bottom blade is formed, and an end mill of the chip discharge groove.
- the coolant hole passing between the chip discharge grooves adjacent to the rotation direction side is opened in the gasche in which the long bottom blade is formed.
- the tip flank connected to the rear side in the end mill rotation direction of the long bottom blade has a chip discharge groove connected to the gash in which the long bottom blade is formed, and the rear side in the end mill rotation direction. Because the coolant hole that passes between the chip discharge groove adjacent to is opened, the coolant is reliably supplied to the tip flank face of the long bottom blade to cool and lubricate it effectively. Suppression can be achieved.
- the coolant hole passing between the chip discharge groove connected to the gash in which the long bottom blade is formed and the chip discharge groove adjacent to the end mill rotation direction side is formed in the gash itself in which the long bottom blade is formed. Since it is open, a large amount of chips generated by the long bottom blade, especially during vertical feed machining and ramping, can be reliably and smoothly discharged by the coolant supplied from the coolant hole opened in the gasche. It becomes possible. Needless to say, good chip discharging performance can be obtained even by ordinary groove processing or shoulder processing in which the end mill body is fed in a direction perpendicular to the axis.
- the tip flank opened to the rear side in the end mill rotation direction of the long bottom blade in the axial tip view.
- the interval between the coolant hole and the long bottom blade is made smaller than the interval between the coolant hole opened in the gash on which the long bottom blade is formed and the bottom blade adjacent to the bottom blade in the end mill rotation direction side. It is desirable that the coolant hole opened in the tip flank of the long bottom blade is formed at a position closer to the long bottom blade.
- the coolant hole opened in the gash in which the long bottom blade is formed may be entirely opened in the gash of the long bottom blade, and the gash in which the long bottom blade is formed and the long bottom It is opened across the tip flank of the bottom blade adjacent to the end mill rotation direction side of the blade, that is, a part is opened to the tip flank adjacent to the end mill rotation direction side of the gasche of the long bottom blade. May be.
- the opening area in the gasche in which the long bottom blade is formed in the axial front end view is set to the long bottom blade. It is desirable to increase the amount of coolant supplied to the gash of the long bottom blade by making it larger than the opening area at the tip flank of the bottom blade adjacent to the end mill rotating direction side of the end mill.
- the coolant hole opened in the tip flank connected to the rear side in the end mill rotation direction of the long bottom blade is in the vicinity of the opening at the tip of the end mill main body and the chip discharge groove connected to the gash in which the long bottom blade is formed.
- the coolant passes through the approximate center in the circumferential direction of the end mill main body between the chip discharge groove adjacent to the rear side in the end mill rotation direction.
- the chips connected to the gash formed with the long bottom blade between the chip discharge groove connected to the gasche formed with the long bottom blade and the chip discharge groove adjacent to the end mill rotating direction side. It will pass near the drain.
- the coolant hole that opens in the gash where the long bottom blade is formed has a lead that is the same as the lead of the outer peripheral blade connected to the bottom blade adjacent to the end mill rotation direction of the long bottom blade, as in a general end mill. If it is twisted toward the end side in the direction of end mill rotation as it goes to the end side, the thickness of the end mill body between the coolant hole and the chip discharge groove connected to the gash in which the long bottom blade is formed becomes smaller and the strength decreases. In particular, at the rear end side of the cutting edge portion where the chip discharge groove away from the bottom edge is cut off, the end mill body may be broken when an excessive load is applied during cutting.
- the coolant hole lead opened on the tip clearance surface connected to the rear side in the end mill rotation direction of the long bottom blade and the outer peripheral blade lead connected to the long bottom blade is made larger than the lead of the outer peripheral blade connected to the bottom blade adjacent to the end mill rotation direction of the long bottom blade. Is desirable.
- the coolant hole opened at the tip flank of the long bottom blade and the chip discharge groove connected to the gash in which the long bottom blade is formed makes it possible to ensure a sufficient thickness between the coolant hole opened at the tip flank of the long bottom blade and the chip discharge groove connected to the gash in which the long bottom blade is formed.
- the coolant hole opened in the gash of the long bottom blade gradually increases in thickness toward the rear end side of the end mill body from the chip discharge groove connected to the gash of the long bottom blade. The strength of the end mill main body on the rear end side can be improved.
- the lead of the coolant hole opened on the tip clearance surface connected to the rear side in the end mill rotation direction of the long bottom blade and the long bottom blade are formed.
- the lead of the coolant hole opened in the gash is made equal to each other, and the lead of the outer peripheral blade connected to the long bottom blade is connected to the bottom blade adjacent to the bottom blade adjacent to the end mill rotation direction side of the long bottom blade.
- the present invention is an end mill in which a plurality of chip discharge grooves are formed in the cutting edge portion, and the outer peripheral blade, the gash, and the bottom blade are formed in the same number as the chip discharge grooves, that is, an end mill excluding a one-blade end mill.
- an end mill excluding a one-blade end mill.
- a three-blade end mill in which one bottom blade extends longer to the inner peripheral side than the other two bottom blades adjacent to each other with a long bottom blade, that is, the cutting blade portion, It is particularly suitable when applied to an end mill with a coolant hole in which three each of the chip discharge grooves, the outer peripheral blade, the gash, and the bottom blade are formed.
- FIG. 3 It is a perspective view which shows one Embodiment of this invention. It is an enlarged front view of embodiment shown in FIG. It is an enlarged side view of the cutting edge part of embodiment shown in FIG. It is an enlarged plan view of the cutting blade part of the embodiment shown in FIG.
- FIG. 4 is an enlarged ZZ sectional view in FIG. 3.
- the end mill body 1 has a substantially cylindrical outer shape centered on the axis O with a hard material such as cemented carbide, and its rear end (upper right part in FIG. 1, right part in FIGS. 2 and 3).
- a cylindrical shank portion 2 and a tip portion (lower left portion in FIG. 1, left portion in FIGS. 2 and 3) is a cutting edge portion 3.
- the shank portion 2 is gripped by the main shaft of the machine tool, and is rotated around the axis O in the end mill rotation direction T and is fed in a direction crossing the axis O, and the cutting blade portion 3 is made of a metal material or the like. Groove machining and shoulder machining of the work material are performed, or the vertical machining and ramping are performed in the direction of the axis O.
- first to third three chip discharge grooves 4A to 4C are sequentially formed in the end mill rotation direction T.
- the wall surface 4a is formed on the outer side edge of the wall surface 4a facing the end mill rotation direction T of the chip discharge grooves 4, that is, the intersecting ridge line portion between the wall surface 4a and the outer circumferential clearance surface 5 facing the outer circumferential side of the cutting edge portion 3.
- Each of the outer peripheral blades 6 having a rake face is formed. Therefore, in the present embodiment, the first to third outer peripheral blades 6A to 6C are formed in order toward the end mill rotation direction T, and the first to third outer peripheral blades 6A to 6C are formed as follows.
- the lead is equal to the first to third chip discharge grooves 4A to 4C, respectively, and twists toward the rear side in the end mill rotation direction T toward the rear end side of the end mill body 1.
- trajectory which these outer periphery blades 6 make around the axis line O is made into one cylindrical surface centering on this axis line O. As shown in FIG.
- each chip discharge groove 4 the wall surface 4 a facing the end mill rotation direction T of each chip discharge groove 4 is notched toward the inner peripheral side of the end mill main body 1, and is formed into a concave groove shape.
- Gash 7 is formed. As shown in FIGS. 3 and 4, the gash 7 has a V-shape that gradually becomes wider toward the tip end as seen from the outer peripheral side of the end mill body 1, and a wall surface 7 a that faces the end mill rotation direction T and the end mill. And a wall surface 7b facing the rear side in the rotation direction T. Therefore, in the present embodiment, the first to third gashes 7A to 7C are formed in order toward the end mill rotation direction T at the tip portions of the first to third chip discharge grooves 4A to 4C, respectively. Become.
- each said wall surface 7a which faces the end mill rotation direction T of these gashes 7 and the front end flank 8 formed by notching the front end surface of the cutting-blade part 3 by the chip discharge groove 4 and the gash 7
- the tip flank 8 has a first flank 8a having a small flank angle intersecting the bottom blade 9 and a second flank having a large flank angle continuous to the rear side in the end mill rotation direction T of the first flank 8a.
- the flank 8b is formed.
- the first to third three tip flank surfaces 8A to 8C are formed on the tip surface of the cutting blade portion 3 by the first to third three chip discharge grooves 4A to 4C and the gashes 7A to 7C. Will be.
- the first bottom blade 9A is formed at the intersecting ridge line portion between the wall surface 7a of the first gash 7A and the first tip flank 8A
- the second gash 7B A second bottom blade 9B is formed at the intersecting ridge line portion between the wall surface 7a and the second tip flank 8B
- the third ridge line portion between the wall surface 7a of the third gash 7C and the third tip flank surface 8C is third.
- the bottom blade 9C is formed.
- first to third bottom blades 9A to 9C have a slight trajectory on the rear end side in the direction of the axis O as the rotation trajectory around the axis O moves toward one plane perpendicular to the axis O or toward the inner peripheral side.
- the end mill of this embodiment is a square end mill in which the bottom blade 9 intersects with the outer peripheral blade 6 at a right angle or slightly at an acute angle in the rotation trajectory.
- each bottom blade 9 extends in a straight line when viewed from the front end in the direction of the axis O, and is positioned slightly on the end mill rotation direction T side with respect to a straight line passing through the axis O parallel to the bottom blade 9. It is considered to be a rising arrangement.
- the first bottom blade 9A is a long bottom extending longer to the inner peripheral side of the end mill body 1 than the other second and third bottom blades 9B and 9C. It is considered a blade.
- the first bottom blade 9A which is a long bottom blade, extends from the tip of the outer peripheral blade 6A to a position exceeding the axis O in the radial direction of the end mill body 1 as shown in FIG. .
- the second bottom blade 9B adjacent to the first bottom blade 9A in the end mill rotation direction T side is the shortest short blade among the first to third bottom blades 9A to 9C.
- the third bottom blade 9C adjacent to the end mill rotation direction T side of the second bottom blade 9B, that is, the rear side of the first bottom blade 9A in the end mill rotation direction T is a first and first bottom blade that is a long and short bottom blade.
- the middle bottom blade has an intermediate length between the two bottom blades 9A and 9B.
- the lengths of the first to third bottom blades 9A to 9C are formed by making the first to third gashs 7A to 7C different sizes.
- the inner peripheral portion is largely cut away so as to communicate with the second gash 7B.
- the second gash 7B in which the second bottom blade 9B is formed at the intersecting ridge line portion between the wall surface 7a and the second tip flank 8B is a third tip flank adjacent to the end mill rotation direction T side.
- the size of the second gash 7B notching the third tip flank 8C is such that the first gash 7A has the second tip. It is made smaller than the size which cuts out the flank 8B.
- the third gash 7C in which the third bottom blade 9C is formed at the intersecting ridge line portion between the wall surface 7a and the third tip flank 8C is an end mill.
- the first tip flank 8A adjacent to the rotation direction T side is not cut out until it communicates with the first gash 7A, and the first tip flank between the first and third gash 7A, 7C. 8A is left on the inner peripheral side until it crosses the axis O when viewed from the front in the direction of the axis O. Accordingly, the first to third bottom blades 9A to 9C are thereby made long, short, and middle bottom blades, respectively.
- coolant holes 10 as many as the chip discharge grooves 4, the outer peripheral edge 6, and the bottom edge 9 from the rear end face of the shank portion 2, that is, from the rear end face of the end mill main body 1 toward the front end. It extends towards the side.
- These coolant holes 10 are formed so as to be twisted to the rear side in the end mill rotation direction T toward the rear end side in the axis O direction, like the chip discharge groove 4 and the outer peripheral blade 6. Are opened at the tip of the cutting edge 3, that is, at the tip of the end mill body 1.
- each coolant hole 10 passing between the third chip discharge groove 4C adjacent to the rear end side in the end mill rotation direction T of the first end blade rotation direction T rear side of the first bottom blade 9A which is a long bottom blade Is opened at the first tip flank 8A.
- Each coolant hole 10 has a circular shape with the same inner diameter in a cross section perpendicular to the axis O.
- the second coolant hole 10B passing between the second chip discharge groove 4B and the second chip discharge groove 4B is opened in the first gash 7A in which the first bottom blade 9A having a long bottom blade is formed.
- the third coolant hole 10C passing between the second and third chip discharge grooves 4B and 4C is opened to the third tip flank 8C connected to the third bottom blade 9C which is the middle bottom blade. It has been.
- the entire first coolant hole 10A is opened to the first tip flank 8A, and in the present embodiment, the first and second flank 8a, 8b of the first tip flank 8A. It is opened on the intersection ridgeline. Further, the entire second coolant hole 10B may be opened in the first gash 7A, but in the present embodiment, a part is opened across the second tip flank 8B. .
- the second coolant hole 10B is opened on the intersecting ridge line between the second tip clearance surface 8B and the wall surface 7b facing the rear side in the end mill rotation direction T of the first gash 7A.
- the opening area of the second coolant hole 10B in the first gash 7A is larger than the opening area of the second coolant hole 10B in the second tip flank 8B. Has also been enlarged.
- the entire third coolant hole 10C may be opened to the third tip flank 8C, but in the present embodiment, a part is opened to straddle the second gash. .
- the opening area of the third coolant hole 10C at the third tip clearance surface 8C is larger than the opening area of the third coolant hole 10C at the second gash 7B, as shown in FIG. Has also been enlarged.
- the second coolant hole 10B has a wall surface 7b facing the rear side in the end mill rotation direction T of the first gash 7A and a second flank surface of the second tip flank surface 8B. Although it opens on the intersection ridgeline with 8b, a part may be opened ranging over the 1st flank 8a of the 2nd front-end
- the third coolant hole 10C is opened on the intersecting ridge line of the first and second flank surfaces 8a and 8b in the third tip flank surface 8C.
- the interval between each bottom blade 9 and each coolant hole 10 adjacent to the rear side in the end mill rotation direction T is set such that the first bottom blade 9A and the first coolant hole 10A are long bottom blades in this embodiment.
- the distance between the second bottom blade 9B, which is a short bottom blade, and the second coolant hole 10B is the largest.
- interval of the 3rd bottom blade 9C used as the middle bottom blade and the 3rd coolant hole 10C is made into the intermediate
- the distance between the bottom blade 9 and each coolant hole 10 adjacent to the rear side in the end mill rotation direction T is, for example, an extension to the inner peripheral side of each bottom blade 9 or its end mill body 1 when viewed from the front in the axis O direction.
- the shortest distance between the line and the opening edge of each coolant hole 10 is set.
- the lead of the first coolant hole 10A opened in the surface 8A and the lead of the first outer peripheral blade 6A connected to the first bottom blade 9A are made equal to each other.
- the lead of the second coolant hole 10B opened in the first gash 7A in which the first bottom blade 9A, which is a long bottom blade, is formed is the end mill rotation of the first bottom blade 9A. It is larger than the lead of the second outer peripheral blade 6B connected to the second bottom blade 9B adjacent to the direction T side.
- the lead of the first coolant hole 10A opened to the first tip flank 8A connected to the rear side in the end mill rotation direction T of the first bottom blade 9A, which is a long bottom blade, and The leads of the second coolant hole 10B opened in the first gash 7A in which the first bottom blade 9A is formed are made equal to each other.
- the lead of the first outer peripheral blade 6A connected to the first bottom blade 9A, which is a long bottom blade is a second bottom blade that is adjacent to the end mill rotation direction T side of the first bottom blade 9A.
- the lead of the second coolant hole 10B is made larger than the lead of the second outer peripheral blade 6B as described above.
- the first to third coolant holes 10A to 10C have the same lead and are equally spaced in the circumferential direction on one cylindrical surface centered on the axis O of the end mill body 1. Is formed. Further, the first to third outer peripheral blades 6A to 6C and the chip discharge grooves 4A to 4C are also located at the position where the chip discharge groove 4 on the rear end side of the cutting blade portion 3 starts to be cut to the outer peripheral side or the outer peripheral blade 6 The rear end of the effective cutting edge length is formed at equal intervals in the circumferential direction as shown in FIG.
- the lead of the first outer peripheral blade 6A is made equal to the lead of the first coolant hole 10A, whereas the lead of the second outer peripheral blade 6B is the lead of the first outer peripheral blade 6A and the coolant hole 10 It is smaller than the lead. That is, the lead of the second coolant hole 10B is made larger than the lead of the second outer peripheral blade 6B.
- the lead of the third outer peripheral blade 6C is made smaller than the lead of the third coolant hole 10C within a range smaller than the difference between the lead of the second coolant hole 10B and the lead of the second outer peripheral blade 6B. That is, the lead of the third coolant hole 10C is also made larger than the lead of the third outer peripheral blade 6C. Accordingly, in the present embodiment, the leads of the first to third outer peripheral blades 6A to 6C have different sizes, and the leads become smaller in the order of the first, third, and second outer peripheral blades 6A, 6C, and 6B. Conversely, the twist angle increases in this order.
- the first to third outer peripheral blades 6A to 6C and the chip discharge grooves 4A to 4C are formed at equal intervals in the circumferential direction on the rear end side of the cutting blade portion 3, and then the first to Since the leads of the three outer peripheral blades 6A to 6C have different sizes, the distance between the first outer peripheral blade 6A and the second outer peripheral blade 6B adjacent to the end mill rotation direction T is closer to the distal end side of the end mill body 1. It gets bigger gradually as you go.
- the circumferential interval between the first bottom blade 9A, which is a long bottom blade, and the second bottom blade 9B, which is a short bottom blade adjacent to the end mill rotation direction T is also increased. It is made larger than the interval between the other bottom blades 9.
- the distance between the third bottom blade 9C, which is the middle bottom blade, and the first bottom blade 9A, which is the long bottom blade adjacent to the end mill rotation direction T side is the next largest and short.
- the interval between the second bottom blade 9B, which is a bottom blade, and the third bottom blade 9C, which is a middle bottom blade adjacent to the end mill rotation direction T is minimized.
- each coolant hole 10 is formed on the end mill rotating direction T side of each coolant hole 10 in the cross section perpendicular to the axis O of the end mill body 1 as shown in FIG. Between the wall surface 4a facing the end mill rotation direction T of the chip discharge groove 4 and the wall surface 4b facing the end mill rotation direction T rear side of the chip discharge groove 4 formed on each coolant hole 10 on the rear side in the end mill rotation direction T. In addition, it is formed so as to ensure a substantially equal wall thickness t.
- the thickness t is the same as that of the circle C and the coolant when a circle C in contact with each coolant hole 10 from the outer peripheral side of the end mill body 1 is drawn in the cross section perpendicular to the axis O.
- the distance between the intersection point Qa between the tangent line L and the wall surface 4a and the contact point P, and the intersection point Qb and the contact point between the tangent line L and the wall surface 4b may be such that, for example, the midpoints of the intersection points Qa and Qb in the cross section are located within a circle defined by the coolant hole 10 in the tangential line L direction.
- the first bottom blade 9A is a long bottom blade extending longer to the inner peripheral side than the other second and third bottom blades 9B, 9C, and the cutting blade length
- the load during cutting is higher than that of the other bottom blades 9B and 9C. Is large, and the amount of generated chips is large.
- the first coolant hole 10A formed adjacent to the rear side in the end mill rotation direction T of the first bottom blade 9A is opened to the first tip flank 8A continuous with the first bottom blade 9A. Therefore, the coolant can be sufficiently distributed to the first tip flank 8A, effective cooling and lubrication can be achieved, and the flank wear of the first tip flank 8A can be suppressed. Can do.
- the distance between the first bottom blade 9A and the first coolant hole 10A on the first tip flank 8A is the distance between the second bottom blade 9B and the second coolant hole 10B.
- the first coolant hole 10A is opened at a position smaller than the distance between the third bottom blade 9C and the third coolant hole 10C, that is, the smallest distance and closer to the first bottom blade 9A. It has been. Accordingly, the first bottom blade 9A, which becomes high temperature during cutting, is efficiently cooled and the first flank 8a having a small flank angle is also reliably lubricated, so that the first flank wear of the first tip flank 8A is caused by the flank wear. It is possible to provide a long-life end mill with a coolant hole while suppressing damage to the bottom blade 9A.
- the second coolant hole 10B is opened so that a part thereof also straddles the second tip flank 8B.
- the opening area of the coolant hole 10B is larger than the opening area of the second coolant hole 10B in the second tip flank 8B. For this reason, most of the coolant supplied from the second coolant hole 10B is guided to the first gash 7A, and the chips generated by the first bottom blade 9A in a large amount can be more reliably secured to the first chip discharge groove 4A. It becomes possible to discharge from.
- the first coolant hole 10A is opened at a position close to the first bottom blade 9A on the first tip flank 8A.
- 9A is formed at the intersecting ridge line portion between the wall surface 7a of the first gash 7A and the first tip clearance surface 8A of the first gash 7A cut out from the tip portion of the first chip discharge groove 4A.
- the first gash 7A is not formed even at the tip of the groove 4A, it is formed at the intermediate position in the circumferential direction between the wall surface 4a of the first chip discharge groove 4A and the wall surface 4b of the third chip discharge groove 4C. can do.
- the lead of the first coolant hole 10 is made equal to the lead of the first outer peripheral blade 6A connected to the first bottom blade 9A.
- the state where the first coolant hole 10a is positioned between the wall surface 4a of the first chip discharge groove 4A and the wall surface 4b of the third chip discharge groove 4C can be maintained. That is, as described above, it can be formed so as to reach the rear end side of the cutting blade portion 3 while ensuring a substantially equal thickness t between the first coolant hole 10a and the wall surfaces 4a, 4b. It is possible to ensure the strength of the end mill body 1 on the rear end side of the cutting blade portion 3 where the largest bending moment acts on the cutting blade portion 3 when a cutting load is generated on the blade 9.
- the first gash 7A is opened to increase the distance from the second bottom blade 9B. That is, the second coolant hole 10B is formed in the first chip discharge groove 4A.
- the lead of the second coolant hole 10B is connected to the second bottom blade 9B in the same manner as the first coolant hole 10A. If the lead is equal to the lead of the second outer peripheral blade 6B, the second coolant hole 10B reaches the rear end side of the cutting blade portion 3 while being close to the wall surface 4b. For this reason, the thickness between the wall surface 4b and the second coolant hole 10B is reduced, the strength of the end mill body 1 is impaired, and the bending moment as described above acts on the rear end side of the cutting edge portion 3. There is a risk of breakage.
- the lead of the second coolant hole 10B opened in the first gash 7A in which the first bottom blade 9A that is the long bottom blade is formed is the first lead. It is larger than the lead of the second outer peripheral blade 6B connected to the second bottom blade 9B adjacent to the end blade rotation direction T side of the bottom blade 9A. Therefore, as the second coolant hole 10B moves toward the rear end side of the cutting edge part 3, the end mill rotation direction T of the second chip discharge groove 4B in which the second outer peripheral edge 6B is formed on the outer peripheral side ridge part. It approaches the wall surface 4a facing the side.
- the first chip discharge The substantially equal wall thickness t can be secured between the groove 4A and the wall surface 4b facing the rear side in the end mill rotation direction T as described above, and the strength reduction of the end mill body 1 can be prevented.
- This is the same for the third coolant hole 10C. Therefore, in this embodiment, as shown in FIG. 5, in all three coolant holes 10, a substantially equal thickness t is formed between the wall surfaces 4a and 4b. Thus, the end mill body 1 can be prevented from being broken, and the life can be further extended.
- the lead of the second coolant hole 10B is the first coolant hole 10A and
- the lead of the first outer peripheral blade 6A is made equal to the lead of the first outer peripheral blade 6A, and the lead of the second outer peripheral blade 6B is made larger than the lead of the second outer peripheral blade 6B. 2 smaller than the leads of the coolant holes 10A and 10B and the first outer peripheral blade 6A.
- the lead of the third coolant hole 10C is also made equal to the first and second coolant holes 10A, 10B and the first outer peripheral blade 6A, and the lead of the third outer peripheral blade 6C is the first and second outer periphery. The middle of the leads of the blades 6A and 6B.
- the first and second outer peripheral blades 6A and 6B are unequal leads.
- all of the first to third outer peripheral blades 6A to 6C are unequal leads.
- the magnitude and direction of the cutting load when cutting the work material are different, and the vibrations of the end mill main body 1 caused by the cutting load can be canceled with each other. Therefore, such vibrations periodically act to prevent chatter vibrations from being generated in the end mill body 1 during cutting, and prevent deterioration of machining accuracy and damage to the end mill body 1 due to such chatter vibrations. it can.
- the first to third outer peripheral blades 6A to 6C are equally spaced in the circumferential direction on the rear end side of the cutting blade portion 3 as described above, and are made unequal leads. Accordingly, the circumferential intervals of the first to third bottom blades 9A to 9C connected to the tips of the first to third outer peripheral blades 6A to 6C are also different from each other. Therefore, vibrations caused by the cutting load acting on the first to third bottom blades 9A to 9C can be canceled out to prevent chatter vibrations more reliably.
- first to third outer peripheral blades 6A to 6C of unequal leads are equally spaced on the rear end side of the cutting blade portion 3 in this way, the first to third outer peripheral blades at the tip of the cutting blade portion 3 6A to 6C and the distances between the first to third bottom blades 9A to 9C may be extremely wide.
- the first cutting edge at the center of the effective cutting edge length of the outer peripheral blade 6 may be used.
- the third outer peripheral blades 6A to 6C may be formed at equal intervals in the circumferential direction.
- the second bottom blade 9B is a short bottom blade and the third bottom blade 9C is a middle bottom blade.
- the second bottom blade 9B is a middle bottom blade
- the third bottom blade 9C is a third bottom blade.
- the bottom blade 9C may be a short bottom blade, and the second and third bottom blades 9B and 9C may have the same length.
- the outer periphery blade and the bottom blade are 1
- the present invention may be applied to a radius end mill in which a convex curve shape such as a 1 ⁇ 4 arc is connected via a corner blade, or in some cases, a ball end mill in which the bottom blade itself forms a convex curve shape such as a 1 ⁇ 4 arc in a rotation locus. Is possible.
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Abstract
Description
2 シャンク部
3 切刃部
4 切屑排出溝
4A~4C 第1~第3の切屑排出溝
4a 切屑排出溝4のエンドミル回転方向Tを向く壁面
4b 切屑排出溝4のエンドミル回転方向T後方側を向く壁面
5 外周逃げ面
6 外周刃
6A~6C 第1~第3の外周刃
7 ギャッシュ
7A~7C 第1~第3のギャッシュ
8 先端逃げ面
8A~8C 第1~第3の先端逃げ面
8a 先端逃げ面8の第1逃げ面
8b 先端逃げ面8の第2逃げ面
9 底刃
9A 第1の底刃(長底刃)
9B 第2の底刃(短底刃)
9C 第3の底刃(中底刃)
10 クーラント穴
10A~10C 第1~第3のクーラント穴
O エンドミル本体1の軸線
T エンドミル回転方向
t 切刃部3後端側におけるクーラント穴10と切屑排出溝4の壁面4a、4bとの間の肉厚
Claims (6)
- 軸線回りに回転されるエンドミル本体の先端部が切刃部とされ、この切刃部の外周には上記軸線方向後端側に向かうに従いエンドミル回転方向後方側に捩れる複数の切屑排出溝が周方向に間隔をあけて形成され、これらの切屑排出溝のエンドミル回転方向を向く壁面の外周側辺稜部に外周刃がそれぞれ形成されるとともに、上記切屑排出溝の先端部にはギャッシュが形成され、これらのギャッシュのエンドミル回転方向を向く壁面と上記エンドミル本体の先端逃げ面との交差稜線部に、上記外周刃の先端から上記エンドミル本体の内周側に延びる底刃がそれぞれ形成されており、上記底刃のうち少なくとも1枚の底刃は、エンドミル回転方向側とエンドミル回転方向後方側とに隣接する他の2枚の底刃よりも上記エンドミル本体の内周側に長く延びる長底刃とされるとともに、上記エンドミル本体内には周方向に隣接する上記切屑排出溝同士の間を通ってクーラント穴がそれぞれ形成されていて、これらのクーラント穴のうち、上記長底刃が形成されたギャッシュに連なる切屑排出溝と該切屑排出溝のエンドミル回転方向後方側に隣接する切屑排出溝との間を通るクーラント穴は、上記長底刃のエンドミル回転方向後方側に連なる先端逃げ面に開口させられるとともに、上記長底刃が形成されたギャッシュに連なる切屑排出溝と該切屑排出溝のエンドミル回転方向側に隣接する切屑排出溝との間を通るクーラント穴は、上記長底刃が形成されたギャッシュに開口させられていることを特徴とするクーラント穴付きエンドミル。
- 上記軸線方向先端視において、上記長底刃のエンドミル回転方向後方側に連なる先端逃げ面に開口させられたクーラント穴と上記長底刃との間隔が、上記長底刃が形成されたギャッシュに開口させられたクーラント穴と上記底刃のエンドミル回転方向側に隣接する底刃との間隔よりも小さくされていることを特徴とする請求項1に記載のクーラント穴付きエンドミル。
- 上記長底刃が形成されたギャッシュに開口させられたクーラント穴は、この長底刃が形成されたギャッシュと上記長底刃のエンドミル回転方向側に隣接する底刃の先端逃げ面とに跨って開口させられるとともに、上記軸線方向先端視において上記長底刃が形成されたギャッシュにおける開口面積が、上記長底刃のエンドミル回転方向側に隣接する底刃の先端逃げ面における開口面積よりも大きくされていることを特徴とする請求項1または請求項2に記載のクーラント穴付きエンドミル。
- 上記長底刃のエンドミル回転方向後方側に連なる先端逃げ面に開口させられたクーラント穴のリードと上記長底刃に連なる外周刃のリードとは等しくされるとともに、上記長底刃が形成されたギャッシュに開口させられたクーラント穴のリードは、上記長底刃のエンドミル回転方向側に隣接する底刃に連なる外周刃のリードよりも大きくされていることを特徴とする請求項1から請求項3のうちいずれか一項に記載のクーラント穴付きエンドミル。
- 上記長底刃のエンドミル回転方向後方側に連なる先端逃げ面に開口させられたクーラント穴のリードと、上記長底刃が形成されたギャッシュに開口させられたクーラント穴のリードとは互いに等しくされ、上記長底刃に連なる外周刃のリードが、上記長底刃のエンドミル回転方向側に隣接する底刃に連なる外周刃のリードよりも大きくされていることを特徴とする請求項4に記載のクーラント穴付きエンドミル。
- 上記切刃部には、それぞれ3つずつの上記切屑排出溝、上記外周刃、上記ギャッシュ、および上記底刃が形成されていることを特徴とする請求項1から請求項5のうちいずれか一項に記載のクーラント穴付きエンドミル。
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KR1020157013848A KR101655711B1 (ko) | 2012-10-29 | 2013-10-21 | 쿨런트 구멍을 구비한 엔드밀 |
US14/436,001 US9833845B2 (en) | 2012-10-29 | 2013-10-21 | End mill with coolant holes |
EP13850824.7A EP2913133B1 (en) | 2012-10-29 | 2013-10-21 | End mill with coolant holes |
CN201380052990.7A CN104718039B (zh) | 2012-10-29 | 2013-10-21 | 带冷却孔的立铣刀 |
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JP2012237853A JP5958277B2 (ja) | 2012-10-29 | 2012-10-29 | クーラント穴付きエンドミル |
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US (1) | US9833845B2 (ja) |
EP (1) | EP2913133B1 (ja) |
JP (1) | JP5958277B2 (ja) |
KR (1) | KR101655711B1 (ja) |
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Also Published As
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KR20150076242A (ko) | 2015-07-06 |
JP2014087859A (ja) | 2014-05-15 |
KR101655711B1 (ko) | 2016-09-07 |
EP2913133A1 (en) | 2015-09-02 |
US9833845B2 (en) | 2017-12-05 |
JP5958277B2 (ja) | 2016-07-27 |
EP2913133A4 (en) | 2016-07-13 |
CN104718039A (zh) | 2015-06-17 |
EP2913133B1 (en) | 2017-04-26 |
CN104718039B (zh) | 2016-12-07 |
US20150266113A1 (en) | 2015-09-24 |
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