WO2012118222A1 - 刃先交換式ボールエンドミル - Google Patents
刃先交換式ボールエンドミル Download PDFInfo
- Publication number
- WO2012118222A1 WO2012118222A1 PCT/JP2012/055562 JP2012055562W WO2012118222A1 WO 2012118222 A1 WO2012118222 A1 WO 2012118222A1 JP 2012055562 W JP2012055562 W JP 2012055562W WO 2012118222 A1 WO2012118222 A1 WO 2012118222A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insert
- screw
- end mill
- blade
- ball end
- 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
- B23C5/1009—Ball nose end mills
- B23C5/1027—Ball nose end mills with one or more removable cutting inserts
-
- 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
- B23C5/1009—Ball nose end mills
- B23C5/1027—Ball nose end mills with one or more removable cutting inserts
- B23C5/1036—Ball nose end mills with one or more removable cutting inserts having a single cutting insert, the cutting edges of which subtend 180 degrees
-
- 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
- B23C5/1009—Ball nose end mills
- B23C5/1027—Ball nose end mills with one or more removable cutting inserts
- B23C5/1045—Ball nose end mills with one or more removable cutting inserts having a cutting insert, the cutting edge of which subtends substantially 90 degrees
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/16—Fixation of inserts or cutting bits in the tool
- B23C2210/165—Fixation bolts
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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
- Y10T407/19—Rotary cutting tool
- Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
- Y10T407/1908—Face or end mill
-
- 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
- Y10T407/19—Rotary cutting tool
- Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
- Y10T407/1908—Face or end mill
- Y10T407/191—Plural simultaneously usable separable tools in common seat or common clamp actuator for plural simultaneously usable tools
-
- 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
- Y10T407/19—Rotary cutting tool
- Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
- Y10T407/1908—Face or end mill
- Y10T407/192—Face or end mill with separate means to fasten tool to holder
Definitions
- the present invention relates to a four-blade blade-end replaceable ball end mill, and more particularly to a blade-tip replaceable ball end mill capable of performing high-speed and high-precision finishing of a mold or the like because of the high fixing position accuracy of the insert.
- ball end mills have been used for cutting of molds, etc., but in recent years, with the increase in size of molds, ball end mills have been required to have a long life with high speed, high efficiency and high precision cutting ability. . Furthermore, it is required to reduce the cutting cost by adopting a blade tip exchange type. In order to meet such demands, various types of cutting edge replaceable tools have been proposed.
- JP-A-60-85815 has (a) a holder 103 having a sphere 102 bonded to the bottom of the slit 101 and a slit 101 in four directions orthogonal to the heel tip, (b) Four fan-shaped cutting tips 104 detachably attached to the slit 101 of the heel holder 103, and (c) a presser plate 105 extending in the axial direction of the heel holder 103, and screwed to the holder 103.
- Each of the cutting tips 104 has a circular notch in the center of the fan shape, and the circular notch is in close contact with the sphere 102 in the holder 103.
- a rotary cutting tool positioned by doing so is disclosed.
- this rotary cutting tool is a four-blade ball end mill
- the cutting tip 104 since the cutting tip 104 is fixed by the screw 106 and the holding plate 105, the cutting tip 104 may come off during high-speed cutting.
- each cutting tip 104 is positioned by contact between the circular notch of each cutting tip 104 and the sphere 102, the dimensional accuracy of the circular notch and the sphere 102, the positional accuracy and durability of the sphere 102, etc. Considering this, it is difficult to fix the cutting tip 104 with high accuracy every time it is replaced.
- Japanese Utility Model Laid-Open No. 54-29490 has (a) a pair of holding portions 202 with a slit 201 inclined, and a screw hole 203 passing through both holding portions 202 through the slit 201. (B) One cutting edge tip 206 having a through-hole 205 in the center of the heel, and (c) both clamping through the through-hole 205 of the cutting edge tip 206 to fix the heel cutting-edge chip 206.
- a drilling tool comprising a fastening bolt 207 that is screwed into the screw hole 203 of the part 202, wherein the cutting edge of the cutting edge tip 206 and the side surface of each clamping part 202 form an obtuse cutting waste discharge groove 208.
- a drilling tool is disclosed.
- the cutting edge tip 206 is inclined with respect to the clamping portion 202, but the through hole 205 of the cutting edge tip 206 and the threaded portion of the fastening bolt 207 are not in contact with each other, and the width of the slit 201 is increased.
- the cutting edge tip 206 is fixed by being narrowed by tightening the bolt 207.
- this drilling tool is a so-called two-blade, not only the cutting efficiency is insufficient, but the fixing method of such a cutting edge tip 206 has a low positioning accuracy, and a three-dimensional cutting process such as a mold cavity. Is not suitable for use as a finishing tool that performs high-speed and high-precision.
- Japanese Patent Laid-Open No. 2001-121339 discloses a pair of protrusions 302 having a slit 301 inclined at the tip, a cutting tip 303 attached to the slit 301, and a pair penetrating the cutting tip 303.
- a throw-away end mill having a large tip pocket 305 is disclosed.
- this throwaway end mill is a so-called two-blade, not only the cutting efficiency is insufficient, but also the cutting tip 303 is not fixed by the clamp bolt 304, so the positioning accuracy of the cutting tip 303 is low, and the gold It is not suitable for use as a finishing tool that performs three-dimensional cutting such as mold cavities at high speed and with high accuracy.
- Japanese Patent Laid-Open No. 11-239911 discloses a tool main body 402 having a slit-shaped tip seat 401 extending in the diameter direction, a throw-away tip 403 mounted on the slit-shaped tip seat 401, and a throw-away tip 403.
- a throwaway cutting tool including a screw 405 that is screwed into a tip portion through the through-hole 404.
- One side surface portion of the tip seat 401 is provided with a cone receiving surface 406 slightly eccentric to the rear at a portion corresponding to the head conical surface 405a of the screw 405, and the cylindrical portion of the screw 405 is provided on the other side surface portion.
- a hole for receiving 407 is provided.
- the side wall 408 of the hole serves as a reference surface for positioning the throwaway tip 403.
- the conical receiving surface 406 is eccentric by ⁇ t toward the bottom surface of the tip seat 401, so the head of the screw 405
- the conical surface 405a is pressed against the conical receiving surface 406.
- this slow-away type cutting tool is a so-called two-blade, cutting efficiency is insufficient, and it is not suitable for cutting a mold cavity or the like at high speed.
- Patent No. 4531981 as shown in FIG. 24, a holder 502 having a slit 501 at the tip, an inclined tapered hole 503, an insert 504 attached to the slit 501, a head 505a, and a screw part A hole having a taper portion 505c between the 505b and a clamp screw 505 through which the taper portion 505c passes through the inclined tapered hole 503 of the insert 504 and the screw portion 505b is screwed into the screw hole at the tip.
- a bore tool is disclosed.
- an object of the present invention is to provide a four-blade blade type replaceable ball end mill capable of mounting an insert at the tip of a tool body with high accuracy.
- a large arcuate blade insert and a small arcuate blade insert are used as a tip end of the tool body in order to obtain a four-blade blade tip replaceable ball end mill. If the screw is inclined with respect to the insert of the large arcuate blade, the interference between the screw of the insert of the large arcuate blade and the screw of the insert of the small arcuate blade is eliminated, and (b) a large circle
- the present inventors have found that a large arcuate blade insert can be accurately positioned by closely engaging a part of the hole of the arcuate blade insert and a part of the screw.
- the blade edge replaceable ball end mill of the present invention has first to third arcuate cutting blades with first to third screws on the first to third mounting seats provided at the hemispherical tip of the tool body, respectively. Since the three inserts are detachably attached,
- the first mounting seat includes a slit formed in a diametrical direction centering on a rotation center axis of the hemispherical tip, and has a chip discharge pocket in front of the rotation direction of the slit, Divide the hemispherical tip into two halves,
- Each of the second and third mounting seats is a notch formed in each half body, each notch being a mounting surface provided on the front surface of each half body in the rotational direction, and the mounting A chip discharge pocket provided in front of the surface in the rotational direction,
- the first screw hole for the first screw penetrates the slit diagonally from one half of the hemispherical tip to the other half, and for the second and third screws.
- the second and third screw holes are respectively formed in the mounting surfaces of the second and third mounting seats, thereby avoiding interference between the first screw and the second and third screws.
- the first insert has a hole inclined so as to align with the first screw hole when mounted on the first mounting seat;
- the hole of the first insert has a finished surface at least partly, and the first screw has a finished surface at least partly between the head and the screw part, and the first mounting seat.
- the first screw hole is located on the rear side of the tool body from the second and third screw holes.
- the straight line connecting the pair of cutting edges of the first insert and the straight line connecting the cutting edges of the second and third inserts are orthogonal to each other.
- the arc-shaped cutting edge of the first insert mounted on the first mounting seat passes through substantially the top of the hemispherical tip, and the second and second mountings mounted on the second and third mounting seats.
- the angle ⁇ formed by the cutting edge of the arcuate cutting edge of the three inserts and the rotation center axis of the tool body is preferably 15 to 30 °.
- the arcuate cutting edge of the first insert preferably has a central angle ⁇ of 180 ° or more, and the arcuate cutting edges of the second and third inserts preferably have a central angle ⁇ of 90 ° or less.
- the first insert is preferably made of cemented carbide.
- the second and third inserts preferably have a structure in which an arc-shaped cutting edge portion made of a cubic boron nitride sintered body is joined to a base body made of a cemented carbide.
- the finished surface of the inclined hole of the first insert preferably has a smaller surface roughness than the finished surface of the first screw.
- the inclination angle ⁇ of the first screw hole is preferably 20 to 40 ° in the direction opposite to the rotation direction of the tool body with respect to a straight line perpendicular to the center line of the first mounting seat.
- the hole of the first insert has a finished central small diameter cylindrical portion and large diameter cylindrical portions on both sides of the central small diameter cylindrical portion, and the first screw is finished between the head and the screw portion. It is preferable to have a processed large diameter cylindrical portion.
- the inner diameter of the central small diameter cylindrical portion is preferably 3 to 10 ⁇ m larger than the outer diameter of the large diameter cylindrical portion.
- the blade tip replaceable ball end mill of the present invention has a structure in which the first insert is fixed to the hemispherical tip by a first screw that passes through obliquely, so that the second and third even if there is a first screw. Sufficient space is secured for the second and third screws for fixing the insert. Because of such a structure, the blade tip replaceable ball end mill of the present invention can have four blades, so that not only can a standing wall such as a mold cavity be cut at high speed and with high accuracy, but two Has a much longer insert life than that of the blade.
- the hole of the first insert and the first screw each have a finished surface, if the first screw passes through the first insert mounted on the first mounting seat, the hole of the first insert is finished. The surface and the finished surface of the first screw are in close engagement so that the first insert is accurately positioned. For this reason, accurate positioning of the insert to be replaced can be easily performed.
- FIG. 7 is a side view showing a hemispherical tip of a replaceable blade end ball end mill of the present invention equipped with an insert (rotated 90 ° with respect to FIG. 6). It is a top view which shows the 1st insert with which the blade-tip-exchange-type ball end mill of this invention is mounted
- FIG. 9 is a perspective view of the first insert shown in FIG. 8 as viewed from one flat portion side.
- FIG. 9 is a perspective view of the first insert shown in FIG. 8 viewed from the other flat surface side.
- FIG. 9 is a front view of the first insert shown in FIG. 8 (viewed from the cutting edge side).
- FIG. 9 is an AA enlarged cross-sectional view of FIG.
- FIG. 9 is an enlarged cross-sectional view showing an as-sintered inclined hole of the first insert shown in FIG. It is a side view showing the 1st screw for fixing the 1st insert. It is a top view which shows the 2nd insert with which the blade-tip-exchange-type ball end mill of this invention is mounted
- FIG. 15 is a perspective view of the second insert shown in FIG.
- FIG. 15 is a left side view of the second insert shown in FIG.
- FIG. 15 is a front view of the second insert shown in FIG. 14 (viewed from the cutting edge side).
- FIG. 5 is a perspective view showing a positional relationship between first to third inserts attached to a tool body.
- FIG. 3 is a perspective view showing a rotary cutting tool disclosed in Japanese Patent Application Laid-Open No. 60-85815. It is a cross-sectional view showing a drilling tool disclosed in Japanese Utility Model Laid-Open No. 54-29490.
- 1 is a cross-sectional view showing a throwaway end mill disclosed in JP-A-2001-121339.
- 1 is a longitudinal sectional view showing a throwaway cutting tool disclosed in Japanese Patent Laid-Open No. 11-239911. It is a cross-sectional view showing a boring tool disclosed in Japanese Patent No. 4531981.
- FIG. 1 shows an overall configuration of a tool body 2 (without an insert) of a blade end replaceable ball end mill according to an embodiment of the present invention
- FIG. 2 shows a hemispherical tip 3 of the tool body 2 3 shows the shape of the hemispherical tip 3 when viewed from the tip side (left side of FIG. 1)
- FIG. 4 is 90 ° around the rotation center axis O 1 with respect to FIG. The shape of the hemispherical tip 3 when viewed by rotation is shown.
- the tool body 2 includes a cylindrical shank portion 2a attached to the machining apparatus, a tapered shank portion 2b provided at the tip of the cylindrical shank portion 2a, and a tip of the tapered shank portion 2b. And a hemispherical tip 3 provided.
- the hemispherical tip 3 includes a cylindrical portion on the tapered shank portion 2b side and a hemispherical portion on the tip side. The boundary between the cylindrical part and the hemispherical part is represented by 3d.
- the tool body 2 can be formed of tool steel such as SK61.
- the first mounting seat 4 includes a slit that divides the hemispherical tip 3 in half. That is, the first mounting seat 4 extends from the apex of the hemispherical tip 3 located on the rotation center axis O 1 of the tool body 2 to a predetermined depth along the rotation center axis O 1 , and the tool body.
- the slit has a side wall surface 4a, 4b and a bottom portion 4c that extend in a diametrical direction 2 to penetrate the hemispherical tip 3 and face each other in parallel. Therefore, the longitudinal direction of the first mounting seat 4 coincides with the diameter direction of the tool body 2 as shown in FIG. 3, and the depth direction of the first mounting seat 4 is the rotation center axis O 1 as shown in FIG. Matches.
- the hemispherical tip 3 is divided into a first half 3a and a second half 3b by a slit-shaped first mounting seat 4.
- Each half-body part 3a, 3b is provided with chip discharge pockets 10, 11 at positions in front of the slit-shaped first mounting seat 4 in the rotational direction.
- the first screw hole 8 for fixing the first insert 12 mounted on the slit-shaped first mounting seat 4 with the first screw 9 It opens to one half 3a and extends to a predetermined depth of the second half 3b.
- the central axis O 3 of the first screw hole 8 has an angle ⁇ in the direction opposite to the rotation direction R of the tool body 2 with respect to the straight line O 4 orthogonal to the center line O 2 of the slit-shaped first mounting seat 4. Just tilted.
- the inclination angle ⁇ of the first screw hole 8 is preferably 20 to 40 °.
- a portion of the first screw hole 8 located in the second half portion 3b is engraved with a screw thread that engages with the screw portion 9e of the first screw 9 (see FIG. 13).
- a notch-shaped second mounting seat 5 for mounting the second insert 13 is formed on the first half 3a, and the second half 3b
- a notch-shaped third mounting seat 6 for mounting the three inserts 14 is formed.
- the second mounting seat 5 and the third mounting seat 6 are arranged at positions symmetrical with respect to the rotation center axis O 1 , but are not limited.
- the second mounting seat 5 includes a mounting surface 5a to which the second insert 13 is fixed by the second screw 15, and a chip discharge pocket 5b positioned in front of the second insert 13 in the rotational direction.
- the third mounting seat 6 includes a mounting surface 6a to which the third insert 14 is fixed by a third screw 16, and a chip discharge pocket 6b positioned in front of the third insert 14 in the rotation direction. Second and third screw holes 5c and 6c into which the second and third screws 15 and 16 (see FIG. 18) are screwed are formed in the mounting surfaces 6a and 6b, respectively. As shown in FIG.
- each of the second and third mounting seats 5 and 6 is provided with an arc-shaped notch at a portion where the ends of the inserts 13 and 14 come into contact.
- the second mounting seat 5 and the third mounting seat 6 also have the same shape.
- FIG. 5 to 7 show a state in which the first to third inserts 12 to 14 are mounted on the first to third mounting seats 4 to 6 of the hemispherical tip 3, respectively.
- the direction O 6 of the arcuate cutting edges 20 and 21 of the second and third inserts 13 and 14 is orthogonal to the direction O 5 of the arcuate cutting edges 17a and 17b of the first insert 12. However, it is inclined from the center line O 8 of the first insert 12 (coincident with the center line O 2 of the first mounting seat).
- the foremost ends of the arcuate cutting edges 20 and 21 of the second and third inserts 13 and 14 are separated from the rotation center axis O 1 . As shown in FIG.
- the distance between the leading edge of the arcuate cutting edges 20 and 21 of the second and third inserts 13 and 14 and the rotation center axis O 1 is the rotation center axis O 1 corresponding to the boundary line 3d. Centered on the upper position M, it is represented by an angle ⁇ formed between the rotation center axis O 1 and the cutting edges of the arcuate cutting edges 20 and 21. As will be described later, the angle ⁇ is preferably 15 to 30 °.
- Insert (1) First insert (a) Shape As shown in FIGS. 8 and 9, the first insert 12 includes a pair of plane portions 12a and 12b, an arcuate cutting edge 17a facing the plane portion 12a, and a circle facing the plane portion 12b.
- the arcuate cutting edge 17b is positioned in front of the arcuate cutting edge 17a in the rotation direction, and is located between the arcuate cutting edge 17a and the arcuate part 18a.
- the two arcuate cutting edges 17a and 17b extend on one semicircular arc when viewed from the direction perpendicular to the cutting edge, and are aligned on a straight line when viewed from above. It is extended.
- Two arcuate cutting edges 17a, 17b is positioned to closest approach is consistent with the apex of the hemispherical tip portion 3 (at the intersection with the central axis of rotation O 1). For this reason, when the first insert 12 rotates about the rotation center axis O 7 coinciding with the rotation center axis O 1 of the tool body 2, the arcuate cutting edges 17a, 17b form a hemisphere with a radius R.
- Such cutting edges 17a and 17b are generally referred to as straight cutting edges or S-shaped cutting edges.
- the first flank surfaces 20a and 20b are provided to accurately form the arcuate cutting edges 17a and 17b.
- the cutting edge is also present at the apex.
- the center angle ⁇ of the arc formed by the arc-shaped cutting edges 17a and 17b is preferably 180 ° or more. Since the center angle ⁇ of the arc formed by the arc-shaped cutting edges 17a and 17b exceeds 180 °, for example, when finishing the standing wall of the mold cavity, the center angle ⁇ is Using a cutting edge portion of 180 ° or less, and a cutting edge portion having a central angle ⁇ exceeding 180 ° when cutting in the upward direction, cutting efficiency is improved.
- the central angle ⁇ is preferably 180 to about 210 °. When the central angle ⁇ exceeds 210 °, the insert becomes too long in the longitudinal direction, resulting in an increase in cost.
- the flat bottom portion 23 of the first insert 12 is in close contact with the bottom portion 4c of the slit-like first mounting seat 4, so that it is finished flat.
- the first feature of the present invention is that, as shown in FIGS. 3 and 11, the first screw hole 8 into which the first screw 9 is screwed is inclined with respect to the slit-like first mounting seat 4.
- the hole 22 of the first insert 12 through which the first screw 9 is inserted is inclined with respect to the pair of flat portions 12a and 12b.
- the first screw 9 for fixing the first insert 12 also fixes the second and third inserts 13 and 14 even in the four-blade replaceable ball end mill 1.
- the second and third screws 15 and 16 do not interfere with each other, and a sufficient space for the second and third screws 15 and 16 can be secured.
- the direction of the inclined hole 22 is represented by an angle ⁇ between the center line O 9 and a straight line O 10 (perpendicular to the pair of plane portions 12a and 12b) orthogonal to the center line O 8 of the first insert 12.
- the angle ⁇ is equal to the angle ⁇ .
- the inclined hole 22 a large diameter having a central small-diameter cylindrical portion 22a of the length L 1 and the inner diameter D 1, the inner diameter D 1 greater than the inner diameter D 2 located on either side of the central small-diameter cylindrical portion 22a It consists of a cylindrical part 22b.
- the central small-diameter cylindrical portion 22a is finished and closely engages with a finished large-diameter cylindrical portion 9c of the first screw 9 described later.
- the length L 1 of the central small diameter cylindrical portion 22a is preferably longer than the length L 2 of the large diameter cylindrical portion 9c of the first screw 9 by approximately D 1 tan ⁇ .
- the entire inclined hole 22 is not easy insertion of the first screw 9 to have an inner diameter D 1. Therefore, by providing the large diameter cylindrical portion 22b on the inlet side of the inclined hole 22, the first screw 9 can be easily inserted into the inclined hole 22.
- the large diameter cylindrical portion 22b may be tapered.
- the first insert 12 preferably made of cemented carbide can be manufactured by the following steps.
- the tungsten carbide particles and the cobalt particles are mixed with additives as necessary, and the granulated powder is press-molded to produce a molded body for the first insert 12.
- the inclined hole 22 of the molded body length L 1 and the inner diameter D 1 'and the central small-diameter cylindrical portion 22a of the inner diameter D 1 on opposite sides of the central small-diameter cylindrical portion 22a' is larger than the inner diameter D 2 And a large-diameter cylindrical portion 22b.
- the central small-diameter cylindrical portion 22a and the large-diameter cylindrical portion 22b are formed larger by 20-30% sintering shrinkage and 0.05-0.3 mm grinding allowance, respectively.
- (b2) Sinter the green body at a predetermined temperature (for example, about 1300 to 1400 ° C.).
- the surface roughness Rza of the central small diameter cylindrical portion 22a after finishing is preferably 1.0 ⁇ m or less.
- the second flank surfaces 21a and 21b are finished with a diamond grindstone to form the first flank surfaces 20a and 20b, and the arcuate cutting edges 17a and 17b are formed.
- the bottom 23 is also finished and flattened.
- a coating of Ti-Al nitride, Ti-Si nitride, Ti-B nitride or the like that imparts wear resistance and heat resistance is applied to the surface of the first insert 12 excluding the inclined hole 22 by the PVD method or It is formed by the CVD method.
- the first screw 9 for fixing the first insert 12 to the slit-shaped first mounting seat 4 is a head 9a and a first small diameter in order. It has a cylindrical portion 9b, a finished large-diameter cylindrical portion 9c, a second small-diameter cylindrical portion 9d, and a screw portion 9e.
- the second feature of the present invention is that when the first screw 9 is inserted into the inclined hole 22 of the first insert 12, the finished large-diameter cylindrical portion 9c is finished in the inclined hole 22. It is to engage closely with the cylindrical portion 22a.
- the large-diameter cylindrical portion 9c can be finished using a cylindrical diamond grindstone or the like.
- the surface roughness Rzb of the finished large diameter cylindrical portion 9c is about 1.5 to 3.5 ⁇ m, which is larger than the surface roughness Rza of the central small diameter cylindrical portion 22a of the inclined hole 22 of the first insert 12.
- the first screw 9 includes a head 9a, a first small-diameter cylindrical portion 9b, a large-diameter cylindrical portion 9c, a second small-diameter cylindrical portion 9d, and a screw portion 9e by lathe processing or the like on a bar of tool steel such as SK61.
- the outer peripheral surface of the large-diameter cylindrical portion 9c can be finished by polishing using a diamond grindstone or the like.
- the outer diameter of the large-diameter cylindrical portion 9c is made smaller by about 3 to 10 ⁇ m than the inner diameter of the central small-diameter cylindrical portion 22a of the first insert 12. Due to such a small clearance, the large-diameter cylindrical portion 9c of the first screw 9 fits into the central small-diameter cylindrical portion 22a of the first insert 12.
- Second and third inserts In the preferred embodiment of the present invention, the second and third inserts 13, 14 have the same shape, so only the second insert 13 will be described in some cases. This description applies directly to the third insert 14.
- the flat plate-like second insert 13 has an arc having a front surface portion 13a, a back surface portion 13b, and a cutting blade 20 provided between the front surface portion 13a and the back surface portion 13b. It has a portion 13c, a first flat portion 13d, a second flat portion 13e, and a second hole 13f that penetrates from the front surface portion 13a to the back surface portion 13b so that the second screw 15 can be inserted therethrough.
- An arc portion 25 having an outer diameter smaller than that of the arc portion 13c is provided in front of the cutting edge 20 in the rotation direction, and a rake face 26 is provided between the arc portion 13c and the arc portion 25.
- the arc portion 13c functions as a first flank
- the arc portion 27 behind the arc portion 13c in the rotation direction functions as a second flank.
- the front surface portion 13a has step portions on both sides of the second hole 13f.
- the second insert 13 is made of an integral cemented carbide base, or has a structure in which an arcuate cutting blade member made of a hard sintered body is brazed to the cemented carbide base.
- An example of the hard sintered body is a cubic boron nitride sintered body (CBN).
- CBN cubic boron nitride sintered body
- the shape and size of the second and third inserts 13 and 14 are such that the first to third inserts 12, 13, and 14 are fixed to the first to third mounting seats 4, 5, and 6 of the hemispherical tip 3. Then, when the tool body 2 is rotated, the arcuate cutting edges 17a, 17b, 20, 21 of the first to third inserts 12, 13, 14 are set to completely form a hemisphere having the same radius R. .
- the arcuate cuts of the second and third inserts 13, 14 are provided.
- the center angle ⁇ of the blades 20 and 21 is preferably 90 ° or less.
- the angle ⁇ between the arcuate cutting edges 20 and 21 of the second and third inserts 13 and 14 and the rotation center axis O 1 is 15 to 30 °. If the angle ⁇ is less than 15 °, the tip ends of the second and third inserts 13 and 14 are too close to the rotation center axis O 1, and the peripheral speed of the arcuate cutting blades 20 and 21 is small.
- the cemented carbide second and third inserts 13 and 14 can be manufactured by the same method as the cemented carbide first insert 12, but it is necessary to finish the inner peripheral surface of the hole 13f. There is no.
- the method of providing the second and third inserts 13 and 14 with arcuate cutting blade members made of CBN includes, for example, the following steps.
- (a) 1st process A notch part is previously provided in the part corresponded to the cutting edge of the 2nd and 3rd inserts 13 and 14.
- the second and third screws 15 and 16 have the same shape as the second and third inserts 13 and 14, so in some cases Only the second screw 15 will be described. This explanation applies directly to the third screw 16.
- the second screw 15 shown in FIG. 18 includes a head portion 15a, a cylindrical portion 15b, and a screw portion 15c.
- the second screw 15 passes through the second hole 13f of the second insert 13, and the screw portion 15c is screwed into the second screw hole 5c of the second mounting seat 5.
- the second insert 13 is firmly fixed to the second mounting seat 5.
- the third insert 14 is firmly fixed to the third mounting seat 6 by the third screw 16.
- the second and third screws 15 and 16 can be manufactured by machining from a bar of tool steel such as SK61.
- the first to third inserts 12, 13, and 14 can be fixed to the tool body 2 by the following procedure.
- Step 1 The first insert 12 is inserted into the slit-shaped first mounting seat 4 and temporarily fixed with the first screw 9.
- Step 2 The second insert 13 is mounted on the second mounting seat 5 and temporarily fixed with the second screw 15.
- Step 3 The third insert 14 is mounted on the third mounting seat 6 and temporarily fixed with the third screw 16.
- Step 4 After adjusting the positions and angles of the first to third inserts 12, 13, and 14, the first to third screws 9, 15, and 16 are tightened to a predetermined torque, and the first to third inserts 12, 13 are tightened. , 14 are fixed to the first to third mounting seats 4, 5, 6 accurately.
- Example 1 Fixed position accuracy of the first insert
- the cutting edge of the insert wears as the cutting time increases, and the cutting accuracy decreases. For this reason, when a predetermined cutting time is reached, a new insert is replaced. However, if there is an error in the positioning of the cutting edge of the new insert, the accuracy of the cutting is reduced. Particularly in the finish cutting of a mold cavity or the like, the positioning accuracy of the cutting edge must be very high. Therefore, the positional accuracy when the first insert 12 was repeatedly fixed to the first mounting seat 4 was measured.
- first inserts 12 having a thickness of 5 mm within the range of 5 mm + 5 ⁇ m to 5 mm + 15 ⁇ m in the inner diameter D 1 of the finishing central small diameter cylindrical portion 22 a and the outer diameter d 1 of the finishing large diameter cylindrical portion 9 c are 5
- Three types of first screws 9 in the range of mm-5 ⁇ m to 5 mm + 2 ⁇ m were prepared.
- the surface roughness Rza of the finished central small diameter cylindrical portion 22a and the surface roughness Rzb of the large diameter cylindrical portion 9c were measured.
- the first insert 12 and the first screw 9 were fixed to the four-blade tool body 2 having an outer diameter of 30 mm shown in FIGS. 1 to 4 in 12 combinations.
- the mounting and demounting were repeated 5 times, and the cutting edge position at the first mounting (the maximum diameter of the arcuate cutting edges 17a and 17b shown in FIG. 6)
- the position of P) was defined as the reference (0), and the difference in the cutting edge position during the second and subsequent mountings was defined as the fixed position accuracy S of the first insert 12.
- the inner diameter D 1 and the surface roughness of the finished central small-diameter cylindrical portion 22a of the first insert 12 Rza, and an outer diameter d 1 and the surface roughness Rzb finishing large-diameter column portion 9c of the first screw 9, fixed cutting edge Table 1 shows the positional accuracy S and its evaluation.
- the evaluation of the fixed position accuracy S was performed according to the following criteria. A: When the fixed position accuracy S is less than ⁇ 1.5 ⁇ m in all 4 times A: When there is a fixed position accuracy S of ⁇ 1.5 ⁇ m ⁇ S ⁇ 4.0 ⁇ m even once. ⁇ : When there is a fixed position accuracy S exceeding ⁇ 4.0 ⁇ m even once.
- the first insert 12 having a surface roughness Rza of the central small diameter cylindrical portion 22a of 0.8 ⁇ m or less and the first screw 9 having a surface roughness Rzb of the large diameter cylindrical portion 9c of 3.2 ⁇ m or less.
- the fixing position accuracy S of the first insert 12 was extremely high, less than ⁇ 1.5 ⁇ m.
- the fixed position accuracy S exceeds ⁇ 4.0 ⁇ m, a long time is required for fine adjustment of the fixed position of the first insert 12.
- the first insert 12 having a surface roughness Rza of the central small diameter cylindrical portion 22a of 0.8 ⁇ m or less is combined with the first screw 9 having a surface roughness Rzb of the large diameter cylindrical portion 9c of 3.2 ⁇ m or less. It can be seen that the first insert 12 can be accurately fixed to the slit-shaped first mounting seat 4 of the hemispherical tip 3.
- Example 2 Cutting test 1 Four types of ball end mills B1 to B4 with the specifications shown in Table 2 were produced.
- the ball end mills B1 and B2 are four-blade tip changeable ball end mills according to the present invention having first to third inserts made of WC base cemented carbide, and the ball end mill B3 is a first made of WC base cemented carbide.
- This is a conventional two-blade replaceable ball end mill having only an insert
- the ball end mill B4 is a conventional ball end mill in which four WC-based cemented carbide cutting blade portions are brazed to the tool body. All the WC-based cemented carbides had an average particle size of WC of 0.6 ⁇ m and a Co content of 8.0% by mass.
- the inclination angle ⁇ of the first screw hole 8 of the hemispherical tip 3 and the inclination of the central small diameter cylindrical portion 22a of the first insert 12 were both 25 °, the inner diameter D 1 of the central small diameter cylindrical portion 22a was 5.007 mm, and the outer diameter d 1 of the large diameter cylindrical portion 9c of the first screw 9 was 4.997 mm.
- both the angle ⁇ and the angle ⁇ were 0 °. Since the conventional ball end mill B4 has four blades brazed, the angle ⁇ and the angle ⁇ do not exist.
- the standing wall cutting test which evaluates the wear resistance of inserts, has a life of 120 minutes for the conventional two-blade replaceable ball end mill B3 and has a surface treatment that improves heat resistance.
- the insert life of the blade-end replaceable ball end mills B1 and B2 of the present invention was 240 minutes and 800 minutes, respectively.
- the blade edge replaceable ball end mills B1 and B2 of the present invention exhibited excellent wear resistance in high-speed cutting of a standing wall and achieved a long life. The reason why the blade end replaceable ball end mill of the present invention has a long insert life even at high-speed cutting is considered to be due to the four blades due to the above first and second features.
- the insert life was even longer, 1200 minutes for B1 and 2500 minutes for B2. Met.
- the blade end replaceable ball end mill of the present invention not only shows high efficiency and long life at high speed cutting of 1000 mm / min, but also has high wear resistance even at a cutting speed of 500 mm / min, which has been generally performed conventionally. It can also be seen that the life is prolonged.
- the insert life of the conventional two-blade edge-changeable ball end mill B3 was 550 minutes, and the insert life of the conventional ball-end mill with four blades brazed was 100 minutes.
- the insert life of the blade end replaceable ball end mills B1 and B2 of the present invention was as long as 600 minutes and 650 minutes, respectively. From this, it can be seen that the cutting edge replaceable ball end mill of the present invention exhibits a good insert life even in flat cutting in which low speed cutting is performed in the vicinity of the tip of the ball end mill.
- Example 3 Cutting test 2 Similarly to Example 2, four types of ball end mills B5 to B8 having the specifications shown in Table 4 below were produced.
- Inclination angle ⁇ of inclination hole 22 of the first insert 12 mounted on the indexable ball end mill B5, B6 of the present invention is the 25 °
- the inner diameter D 1 of the central small-diameter cylindrical portion 22a is 5.007 mm
- the first The outer diameter d 1 of the large-diameter cylindrical portion 9c of the screw 9 was 4.997 mm.
- the insert life of the conventional two-blade blade-replaceable ball end mill B7 is 33 minutes, and the insert is not surface-treated to give heat resistance.
- the insert life of the conventional ball end mill B8 with 4 blades is only 3 minutes.
- the insert life of the blade end replaceable ball end mills B5 and B6 of the present invention was 65 minutes and 230 minutes, respectively. From this, it can be seen that the blade end replaceable ball end mills B5 and B6 of the present invention exhibit excellent wear resistance and high life in high-speed cutting such as a standing wall of a mold.
- the insert life of the conventional two-blade replaceable ball end mill B7 is 200 minutes, and the insert life of the conventional ball end mill B8 with brazed four-blade is It was 20 minutes.
- the insert life of the blade-end replaceable ball end mills B5 and B6 of the present invention was 220 minutes and 240 minutes, respectively. From this, it can be seen that by having the above first and second features, the cutting edge replaceable ball end mill of the present invention has a good insert life even in a plane cutting test that requires wear resistance.
- the cutting edge-replaceable ball end mill of the present invention is a work material made of FCD550 casting and a high hardness cold die steel SKD11 (HRC : 62) When high-speed standing wall cutting and plane cutting are performed on the mold consisting of 62), it is shown that the wear resistance is superior to that of the conventional ball end mill and that a long insert life is exhibited.
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Abstract
Description
前記第一の取付座は、前記半球状先端部の回転中心軸線を中心として直径方向に形成されたスリットからなるとともに、前記スリットの回転方向前方に切屑排出用ポケットを有し、前記スリットは前記半球状先端部を2つの半体部に二分割し、
前記第二及び第三の取付座の各々は各半体部に形成された切欠き部であって、各切欠き部は各半体部の回転方向前面に設けられた取付面と、前記取付面の回転方向前方に設けられた切屑排出用ポケットとを有し、
前記第一のネジ用の第一のネジ穴は、前記半球状先端部の一方の半体部から他方の半体部まで前記スリットを斜めに貫通するとともに、前記第二及び第三のネジ用の第二及び第三のネジ穴はそれぞれ前記第二及び第三の取付座の前記取付面に形成されており、もって前記第一のネジと前記第二及び第三のネジとの干渉が回避され、
前記第一のインサートは前記第一の取付座に装着されたときに前記第一のネジ穴と整合するように傾斜した穴を有し、
前記第一のインサートの穴は少なくとも一部に仕上げ面を有し、前記第一のネジは頭部とネジ部との間の少なくとも一部に仕上げ面を有し、前記第一の取付座に装着された前記第一のインサートに前記第一のネジを貫通すると前記第一のインサートの穴の仕上げ面と前記第一のネジの仕上げ面とが密に係合し、もって前記第一のインサートが正確に位置決めされることを特徴とする。
図1は本発明の一実施形態による刃先交換式ボールエンドミルの工具本体2(インサートを装着していない)の全体構成を示し、図2は工具本体2の半球状先端部3を詳細に示し、図3は先端側(図1の左側)から見たときの半球状先端部3の形状を示し、図4は図1に対して回転中心軸線O1を中心にして90°回転させて見たときの半球状先端部3の形状を示す。
(1) 第一のインサート
(a) 形状
図8及び図9に示すように、第一のインサート12は、一対の平面部12a,12bと、平面部12aに面する円弧状切刃17aと、平面部12bに面する円弧状切刃17bと、円弧状切刃17aの回転方向前方に位置し、円弧状切刃17aより小さい外径を有する円弧部18aと、円弧状切刃17aと円弧部18aとの間に位置するすくい面19aと、円弧状切刃17aに接する第一の逃げ面20aと、第一の逃げ面20aに連なる第二の逃げ面21aと、円弧状切刃17bの回転方向前方に位置し、円弧状切刃17bより小さい外径を有する円弧部18bと、円弧状切刃17bと円弧部18bとの間に位置するすくい面19bと、円弧状切刃17bに接する第一の逃げ面20bと、第一の逃げ面20bに連なる第二の逃げ面21bと、一対の平面部12a,12bを斜めに貫通する穴22と、直線状の稜線により形成された平坦な底部23とを有する。
超硬合金からなるのが好ましい第一のインサート12は下記工程により製造することができる。
第一のインサート12をスリット状の第一の取付座4に固定するための第一のネジ9は、図13に示すように、順に頭部9a、第一の小径円柱部9b、仕上げ加工を施した大径円柱部9c、第二の小径円柱部9d、及びネジ部9eとを有する。本発明の第二の特徴は、第一のネジ9を第一のインサート12の傾斜穴22内に挿入したときに、仕上げ加工した大径円柱部9cが傾斜穴22内の仕上げ加工した中央小径円筒部22aに密に係合することである。
本発明の好ましい実施形態では第二及び第三のインサート13,14は同じ形状を有するので、場合によっては第二のインサート13についてのみ説明する。この説明は第三のインサート14にそのまま当てはまる。
(a) 第一の工程
第二及び第三のインサート13,14の切刃に相当する部分に予め切り欠き部を設ける。切り欠き部にCBNからなる円弧状切刃部材を正確に固着しなければならないので、切り欠き部の固定面をダイヤ砥石等で仕上げ加工する。
円盤状CBNブロックからワイーヤーカット法等により円弧状切刃部材を切り出す。
第二及び第三のインサート13,14の切り欠き部にCBN焼結体からなる円弧状切刃部材をロウ付けする。最後にダイヤモンド砥石により円弧状切刃部材の切刃部を研磨し、所望の切刃20,21を形成する。
本発明の好ましい実施形態では第二及び第三のネジ15,16も第二及び第三のインサート13,14と同様に同じ形状を有するので、場合によっては第二のネジ15についてのみ説明する。この説明は第三のネジ16にそのまま当てはまる。
工具本体2に第一~第三のインサート12,13,14を下記の手順により固定することができる。
第一のインサート12をスリット状の第一の取付座4に挿入し、第一のネジ9で仮止めする。
(b) 手順2
第二のインサート13を第二の取付座5に装着し、第二のネジ15で仮止めする。
(c) 手順3
第三のインサート14を第三の取付座6に装着し、第三のネジ16で仮止めする。
(d) 手順4
第一~第三のインサート12,13,14の位置及び角度を調整した後、第一~第三のネジ9,15,16を所定のトルクまで締め、第一~第三のインサート12,13,14を第一~第三の取付座4,5,6に正確に固定する。
第一のインサートの固定位置精度
インサートの切刃は切削加工時間が長くなるにつれて摩耗し、切削精度が低下する。このため、所定の切削加工時間に達すると新しいインサートに交換するが、新しいインサートの切刃の位置決めに誤差があると切削加工の精度が低下する。特に金型キャビティ等の仕上げ切削加工では、切刃の位置決め精度は非常に高くなければならない。そこで、第一のインサート12を繰り返し第一の取付座4に固定したときの位置精度を測定した。
◎:固定位置精度Sが4回とも±1.5μm未満の場合。
○:1回でも±1.5μm≦S<±4.0μmの固定位置精度Sがあった場合。
△:1回でも±4.0μmを超える固定位置精度Sがあった場合。
切削試験1
表2に示す仕様の4種類のボールエンドミルB1~B4を作製した。ボールエンドミルB1及びB2はWC基超硬合金製の第一~第三のインサートを有する本発明の4枚刃の刃先交換式ボールエンドミルであり、ボールエンドミルB3はWC基超硬合金製の第一のインサートのみ有する2枚刃の従来の刃先交換式ボールエンドミルであり、ボールエンドミルB4は4枚のWC基超硬合金製切刃部を工具本体にロウ付けした従来のボールエンドミルである。いずれのWC基超硬合金も、WCの平均粒径が0.6μmであり、Co含有量が8.0質量%であった。
加工方法: 仕上げの乾式切削
切削速度: 1130 m/min
回転数: 12000 rpm
送り速度: 10800 mm/min
1刃当たりの送り量: 0.22~0.45 mm/刃
軸方向切込み量: 0.15 mm
径方向切込み量: 0.5 mm
工具突き出し量: 110 mm
切削試験2
実施例2と同様に、下記表4に示す仕様の4種類のボールエンドミルB5~B8を作製した。本発明の刃先交換式ボールエンドミルB5,B6に装着した第一のインサート12の傾斜穴22の傾斜角δは25°であり、中央小径円筒部22aの内径D1は5.007 mmであり、第一のネジ9の大径円柱部9cの外径d1は4.997 mmであった。
加工方法: 仕上げの乾式切削
切削速度: 300 m/min
回転数: 3200 rpm
送り速度: 1920 mm/min
1刃当たりの送り量: 0.15~0.3 mm/刃
軸方向切込み量: 0.15 mm
径方向切込み量: 0.5 mm
工具突き出し量: 110 m
Claims (11)
- 工具本体の半球状先端部に設けた第一~第三の取付座にそれぞれ第一~第三のネジにより円弧状切刃を有する第一~第三のインサートを着脱自在に装着する刃先交換式ボールエンドミルであって、
前記第一の取付座は、前記半球状先端部の回転中心軸線を中心として直径方向に形成されたスリットからなるとともに、前記スリットの回転方向前方に切屑排出用ポケットを有し、前記スリットは前記半球状先端部を2つの半体部に二分割し、
前記第二及び第三の取付座の各々は各半体部に形成された切欠き部であって、各切欠き部は各半体部の回転方向前面に設けられた取付面と、前記取付面の回転方向前方に設けられた切屑排出用ポケットとを有し、
前記第一のネジ用の第一のネジ穴は、前記半球状先端部の一方の半体部から他方の半体部まで前記スリットを斜めに貫通するとともに、前記第二及び第三のネジ用の第二及び第三のネジ穴はそれぞれ前記第二及び第三の取付座の前記取付面に形成されており、もって前記第一のネジと前記第二及び第三のネジとの干渉が回避され、
前記第一のインサートは前記第一の取付座に装着されたときに前記第一のネジ穴と整合するように傾斜した穴を有し、
前記第一のインサートの穴は少なくとも一部に仕上げ面を有し、前記第一のネジは頭部とネジ部との間の少なくとも一部に仕上げ面を有し、前記第一の取付座に装着された前記第一のインサートに前記第一のネジを貫通すると前記第一のインサートの穴の仕上げ面と前記第一のネジの仕上げ面とが密に係合し、もって前記第一のインサートが正確に位置決めされることを特徴とする刃先交換式ボールエンドミル。 - 請求項1に記載の刃先交換式ボールエンドミルにおいて、前記第一のネジ穴が前記第二及び第三のネジ穴より工具本体の後方側に位置していることを特徴とする刃先交換式ボールエンドミル。
- 請求項1又は2に記載の刃先交換式ボールエンドミルにおいて、前記第一のインサートの一対の切刃を結ぶ直線と、前記第二及び第三のインサートの切刃を結ぶ直線とが直交していることを特徴とする刃先交換式ボールエンドミル。
- 請求項1~3のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一の取付座に装着された前記第一のインサートの円弧状切刃は前記半球状先端部のほぼ頂点を通り、前記第二及び第三の取付座に装着された前記第二及び第三のインサートの円弧状切刃の最先端と前記工具本体の回転中心軸線とがなす角度αは15~30°であることを特徴とする刃先交換式ボールエンドミル。
- 請求項1~4のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一のインサートの円弧状切刃は180°以上の中心角βを有し、前記第二及び第三のインサートの円弧状切刃は90°以下の中心角γを有することを特徴とする刃先交換式ボールエンドミル。
- 請求項1~5のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一のインサートは超硬合金からなることを特徴とする刃先交換式ボールエンドミル。
- 請求項1~6のいずかに記載の刃先交換式ボールエンドミルにおいて、前記第二及び第三のインサートは超硬合金からなる基体に立方晶窒化硼素焼結体からなる円弧状切刃部が接合された構造を有することを特徴とする刃先交換式ボールエンドミル。
- 請求項1~7のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一のインサートの傾斜穴の仕上げ面は前記第一のネジの仕上げ面より小さな表面粗さを有することを特徴とする刃先交換式ボールエンドミル。
- 請求項1~8のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一の取付座の中心線に直交する直線に対する前記第一のネジ穴の傾斜角θが、前記工具本体の回転方向と逆方向に20~40°であることを特徴する刃先交換式ボールエンドミル。
- 請求項1~9のいずれかに記載の刃先交換式ボールエンドミルにおいて、前記第一のインサートの穴は仕上げ加工した中央小径円筒部と、前記中央小径円筒部の両側の大径円筒部とを有し、前記第一のネジは頭部とネジ部との間に仕上げ加工した大径円柱部を有することを特徴とする刃先交換式ボールエンドミル。
- 請求項10に記載の刃先交換式ボールエンドミルにおいて、前記中央小径円筒部の内径が前記大径円柱部の外径より3~10μmだけ大きいことを特徴とする刃先交換式ボールエンドミル。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12752181.3A EP2682213B1 (en) | 2011-03-03 | 2012-03-05 | Edge replaceable ball end mill |
US14/002,599 US9352401B2 (en) | 2011-03-03 | 2012-03-05 | Indexable ball end mill |
CN201280011494.2A CN103415366B (zh) | 2011-03-03 | 2012-03-05 | 可转位式球头立铣刀 |
KR1020137026074A KR101888978B1 (ko) | 2011-03-03 | 2012-03-05 | 날끝 교환식 볼 엔드밀 |
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JP2011-046814 | 2011-03-03 | ||
JP2011046814A JP5060626B2 (ja) | 2011-03-03 | 2011-03-03 | 刃先交換式ボールエンドミル |
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WO2012118222A1 true WO2012118222A1 (ja) | 2012-09-07 |
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US (1) | US9352401B2 (ja) |
EP (1) | EP2682213B1 (ja) |
JP (1) | JP5060626B2 (ja) |
KR (1) | KR101888978B1 (ja) |
CN (1) | CN103415366B (ja) |
WO (1) | WO2012118222A1 (ja) |
Cited By (1)
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CN103028768A (zh) * | 2013-01-09 | 2013-04-10 | 北京理工大学 | 一种微细球端铣刀及制备工艺 |
CN103028768B (zh) * | 2013-01-09 | 2015-11-25 | 北京理工大学 | 一种微细球端铣刀及制备工艺 |
Also Published As
Publication number | Publication date |
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EP2682213A1 (en) | 2014-01-08 |
CN103415366B (zh) | 2015-10-14 |
JP5060626B2 (ja) | 2012-10-31 |
EP2682213B1 (en) | 2018-12-19 |
CN103415366A (zh) | 2013-11-27 |
KR20140020952A (ko) | 2014-02-19 |
KR101888978B1 (ko) | 2018-08-16 |
EP2682213A4 (en) | 2015-01-21 |
US9352401B2 (en) | 2016-05-31 |
JP2012183597A (ja) | 2012-09-27 |
US20130336731A1 (en) | 2013-12-19 |
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