WO2013035619A1 - ヘッド交換式切削工具 - Google Patents
ヘッド交換式切削工具 Download PDFInfo
- Publication number
- WO2013035619A1 WO2013035619A1 PCT/JP2012/071973 JP2012071973W WO2013035619A1 WO 2013035619 A1 WO2013035619 A1 WO 2013035619A1 JP 2012071973 W JP2012071973 W JP 2012071973W WO 2013035619 A1 WO2013035619 A1 WO 2013035619A1
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- WO
- WIPO (PCT)
- Prior art keywords
- diameter
- head
- inner peripheral
- connecting member
- press
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/006—Details of the milling cutter body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
- B23C5/22—Securing arrangements for bits or teeth or cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D77/00—Reaming tools
- B23D77/02—Reamers with inserted cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/02—Connections between the shanks and detachable cutting heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2240/00—Details of connections of tools or workpieces
- B23C2240/24—Connections using screws
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
- B23C2270/06—Use of elastic or plastic deformation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/26—Securing milling cutters to the driving spindle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
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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
- Y10T407/1932—Rotary cutting tool including holder [i.e., head] having seat for inserted tool with means to fasten tool seat to holder
-
- 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
- Y10T408/94—Tool-support
- Y10T408/95—Tool-support with tool-retaining means
-
- 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
- Y10T409/00—Gear cutting, milling, or planing
- Y10T409/30—Milling
- Y10T409/30952—Milling with cutter holder
Definitions
- the present invention relates to a head exchangeable cutting tool such as a cutting head having a blade portion and connected to a holder and a holder for connecting and holding the cutting head.
- a male screw portion is formed at the rear end portion of a cutting head integrally formed of cemented carbide, and this male screw portion is formed into a female screw portion formed in a holder. It has been proposed to be screwed into the connection.
- a steel part is fixed to the shank part which consists of a cemented carbide by brazing, and the internal thread part for fixing a cutting head in the back
- the cutting head and the screw portion for connecting the holder are formed on the connecting member made of the metal material which is low in hardness but high in toughness and hardly chipped. And the holder can be reliably connected.
- the mounting portion is plastically deformed so as to be expanded in diameter by the press-fitting member, and the outer peripheral surface thereof is in close contact with the inner peripheral surface of the mounting hole and is engaged with the concave portion. The strength is high, and the cutting head does not fall off due to the cutting force detaching the tool body and the connecting member.
- the connecting member in order to further increase the bonding strength between the tool body and the connecting member, is formed of a metal material having a relatively high hardness although having a lower hardness than the tool body. If the difference between the outer diameter of the press-fitting member and the inner diameter of the mounting part is increased to increase the amount of plastic deformation of the mounting part, an excessive load acts on the press-fitting member to promote wear, There is a possibility that the metal material forming the material may cause welding on the press-fitting member and shorten the life of the press-fitting member. For this reason, it has been difficult to mass-produce head interchangeable cutting tools that further enhance the bonding strength between the tool body and the connecting member.
- the present invention has been made under such a background, and is capable of mass production without further shortening the life of the press-fitting member while further improving the bonding strength between the tool body and the connecting member.
- the object is to provide a replaceable cutting tool.
- the present invention has a lower hardness than the hard material in the mounting hole having a recess in the inner peripheral surface formed in the tool body made of the hard material.
- a cylindrical mounting portion of a connecting member made of a metal material is inserted, plastically deformed so that the mounting portion expands, and the outer peripheral surface of the mounting portion is brought into close contact with the inner peripheral surface of the mounting hole.
- a head exchangeable cutting tool in which the tool main body and the connecting member are joined by being engaged with the concave portion, and a diameter-expanding member having higher hardness than the connecting member at the inner peripheral portion of the mounting portion Is fixed by being press-fitted, and the mounting portion is plastically deformed by the expanded member.
- the mounting portion of the connecting member is not plastically deformed and expanded in diameter by press-fitting and extracting the press-fitting member (punch) as described above, but the expansion is higher in hardness than the connecting member.
- a diameter member is press-fitted into the inner peripheral portion of the mounting portion and plastically deformed so as to expand the mounting portion, and this expanded member is fixed to the mounting portion so as to remain in the inner peripheral portion.
- the press-fitting member such as a punch for press-fitting the diameter-expanding member does not need to be brought into contact with the inner peripheral portion of the attachment portion.
- the connecting member is formed of a relatively hard metal material, or the difference between the outer diameter of the enlarged member and the inner diameter of the mounting portion is increased. Even if the amount of plastic deformation of the mounting portion is increased, the press-fitting member is not damaged, and it is possible to deal with mass production.
- the connecting member is made of a metal material having a high hardness, and the diameter-enlarging member having a hardness higher than that of the connecting member is not formed on the inner peripheral portion of the mounting portion without increasing the amount of plastic deformation of the mounting portion. Since it remains after being press-fitted, it is possible to improve the bonding strength between the tool body and the connecting member.
- the diameter-expanding member is formed such that at least a portion facing the press-fitting direction side of the diameter-expanding member to the inner peripheral portion of the attachment portion gradually decreases in outer diameter as it goes in the press-fitting direction. This is desirable for smooth press-fitting of the diameter-expanding member.
- a diameter-expanding member may be, for example, a spherical one or a taper pin-like one, or a spherical one having a flat surface on the rear side in the press-fitting direction so that it can be easily press-fitted at the front end face of the punch. May be.
- the inner peripheral portion of the attachment portion of the connecting member may be used as a coolant hole for supplying coolant to the blade portion of the cutting head. If the inner peripheral part of this is sealed by press-fitting a diameter-expanding member, coolant cannot be supplied. Therefore, in such a case, the outer diameter in the cross section orthogonal to the central axis of the cylinder formed by the mounting portion in the diameter-expanding member fixed to the inner peripheral portion is the maximum on the inner peripheral portion of the mounting portion. By forming a groove extending across the position in the central axis direction, coolant can be supplied through the groove.
- the connecting member is formed of a hard metal material or the plastic deformation amount is increased.
- mass production can be performed without incurring a shortened life of the press-fitting member due to damage, etc. It is possible to improve the bonding strength.
- FIG. 1 It is a perspective view which shows the state which attached the cutting head which is one Embodiment of the head exchange-type cutting tool of this invention to the holder. It is the (a) perspective view, (b) side view, (c) front view of the cutting head of embodiment shown in FIG. (A) Side view of cutting head material manufactured for cutting head of embodiment shown in FIG. 1, (b) ZZ side sectional view in Fig. (A), (c) Tool body material in Fig. (B) ( It is a sectional side view of a head body material) portion. It is the (a) perspective view, (b) side view, (c) front view, (d) side sectional view of the connecting member before plastic deformation of the embodiment shown in FIG. FIG.
- FIG. 4A is a side sectional view before press-fitting a diameter-expanding member when joining a connecting member to the cutting head material shown in FIG. 3, and FIG. 4B is a side sectional view after press-fitting the diameter-expanding member.
- FIG. 3A is a side view of a modification of the cutting head material
- FIG. 3B is a sectional view taken along the ZZ side of FIG. 3A
- FIG. 3C is a tool body material (head body material) portion of FIG. It is a sectional side view.
- FIG. 8A is a perspective view
- FIG. 8B is a side view
- FIG. 8C is a front view
- FIG. 1 to 5 show an embodiment in which the present invention is applied to a cutting head that is detachably attached to a holder as a head exchangeable cutting tool and constitutes an end mill.
- the cutting head is formed of a hard material such as cemented carbide, cermet, ceramics, etc., which is integrally formed with the head body 1 as a tool body in the present embodiment.
- a connecting member 2 made of a plastically deformable metal material such as a steel material such as stainless steel or die steel having a lower hardness than the material is joined.
- the cutting head constituting such an end mill has a central axis O of the head main body 1 (cylindrical shape which will be described later in this embodiment) at the tip of a cylindrical shaft holder 3 as shown in FIG.
- the holder 3 is attached to the main shaft of the machine tool and is rotated in the end mill rotation direction T around the axis O and intersects the axis O.
- the workpiece is cut by being fed in the direction.
- the head body 1 has a blade portion 11 in which cutting blades are formed in order from the front end side (left side in FIG. 2B) to the rear end side (right side in FIG. 2B). And an engaging portion 12 with which a wrench or the like is engaged when the cutting head is replaced, and the outer diameter is smaller than those of the blade portion 11 and the engaging portion 12, and the outer diameter is directed toward the rear end side.
- a truncated cone-shaped tapered shaft portion 13 is formed with the axis O gradually decreasing.
- the inclination angle formed by the outer peripheral surface of the taper shaft portion 13 with respect to the axis O is preferably in the range of 1 ° to 20 °, more preferably in the range of 1 ° to 5 °, and still more preferably. It is set within a range of 1 ° to 3 °, and in this embodiment, 2 °.
- a plurality of chip discharge grooves 14 twisted toward the rear side in the end mill rotation direction T around the axis O from the front end to the rear end side of the head body 1 at equal intervals in the circumferential direction (this embodiment) In the form, four strips) are formed, and an outer peripheral edge 15a is formed as the cutting edge on the outer peripheral side ridge portion of the chip discharge groove 14, and a bottom blade 15b is also formed as a cutting edge on the distal end side ridge portion.
- the end mill of this embodiment is a radius end mill, and a corner edge 15c having a convex curve shape such as a quarter arc is formed at a corner portion where the outer peripheral edge 15a and the bottom edge 15b intersect. Therefore, a plurality of (four) cutting edges including the outer peripheral edge 15a, the bottom edge 15b, and the corner edge 15c are formed in the head body 1.
- FIG.3 (c) shows the head main body raw material 1A used as the raw material of the head main body 1 before such a chip discharge
- the connecting member 2 is joined to the head body material 1A manufactured by sintering the hard material as described above.
- the chip discharge groove 14, the outer peripheral edge 15 a, the bottom edge 15 b, and the corner edge 15 c of the part 11 are formed in the head body 1.
- the head body material 1A has an attachment hole 16 that opens to the rear end surface of the taper shaft portion 13 and extends to the front end side, and communicates further to the front end side of the attachment hole 16 to A bottomed coolant hole 17 having a smaller diameter than the mounting hole 16 is formed along the axis O, and a plurality of branch holes 18 having a smaller diameter are formed from the inner peripheral surface of the coolant hole 17.
- the four branch holes 18 of the same number as the cutting blades extend toward the outer peripheral side with an interval in the circumferential direction toward the distal end side, and a portion corresponding to the blade portion 11 of the head main body 1 in the head main body material 1A. It is made to open to the outer peripheral surface.
- the attachment hole 16 has a bottom surface, that is, a boundary portion with the coolant hole 17, substantially positioned at a boundary portion between the blade portion 11 of the head main body 1 and the engagement portion 12 in the head main body material 1 ⁇ / b> A in the axis O direction.
- a bottom surface that is, a boundary portion with the coolant hole 17, substantially positioned at a boundary portion between the blade portion 11 of the head main body 1 and the engagement portion 12 in the head main body material 1 ⁇ / b> A in the axis O direction.
- an annular groove 16a whose section along the axis O forms a concave curve such as an arc and circulates around the axis O is shown in FIG.
- a plurality of strips are formed at intervals from the rear end surface of the tapered shaft portion 13 and the bottom surface, but at least the annular groove on the distal end side (the distal end in the present embodiment).
- Two annular grooves 16a on the side are formed at positions where they contact the engaging portion 12 of the head main body 1 in the head main body material 1A in the axis O direction.
- the connecting member 2 has a substantially cylindrical mounting portion 21 centered on the axis O on the front end side, and a male screw portion 22 having a larger diameter than the mounting portion 21 on the rear end side.
- the outer diameter of the mounting portion 21 is slightly smaller than the inner diameter of the mounting hole 16 before plastic deformation, and the outer diameter of the male screw portion 22 is larger than the inner diameter of the mounting hole 16.
- the outer diameter of the rear end surface of the taper shaft portion 13 is made smaller.
- the direction of twisting of the male screw portion 22 is opposite to the end mill rotation direction T.
- the inner peripheral portion of the cylindrical mounting portion 21 passes through the male screw portion 22 and is opened at the rear end face of the connecting member 2.
- the inner peripheral portion of the connecting member 2 has a slightly smaller inner diameter at the mounting portion 21 than the male screw portion 22 at least before the plastic deformation shown in FIG.
- the length of the mounting portion 21 in the direction of the axis O is shorter than the depth of the mounting hole 16 as shown in FIG. 3B, except that the front end surface of the male screw portion 22 abuts the rear end surface of the tapered shaft portion 13. In this state, the length exceeds the most advanced annular groove 16a.
- a groove 21 a extending in the direction of the axis O is formed at the tip of the attachment portion 21.
- the groove 21a in the present embodiment is a slit-like shape formed so as to penetrate the inner and outer peripheral portions of the mounting portion 21 in the radial direction from the tip of the mounting portion 21 toward the rear end side along the plane including the axis O. Therefore, a plurality of such grooves 21a are formed at intervals in the circumferential direction (four in this embodiment at equal intervals in the circumferential direction).
- the length of the groove 21a from the tip of the mounting portion 21 is such that the tip surface of the male screw portion 22 is in contact with the rear end surface of the tapered shaft portion 13 as shown in FIG.
- the rear end is substantially positioned at the boundary between the engaging portion 12 and the tapered shaft portion 13 of the head body 1 in the head body material 1A in the direction of the axis O.
- the mounting portion 21 is inserted into the mounting hole 16 in the head body material 1 ⁇ / b> A, and the front end surface of the male screw portion 22 is brought into contact with the rear end surface of the tapered shaft portion 13 as described above.
- the diameter-expanding member 4 is press-fitted and fixed to the inner peripheral part thereof as shown in FIG.
- the head body material 1A is joined and attached.
- the diameter-expanding member 4 is formed of a metal material such as tool steel or bearing steel, which has a hardness higher than that of the connecting member 2 and has a hardness equal to or lower than the hardness of the head body 1. And like the head main body 1, you may form with hard materials, such as a cemented carbide alloy, a cermet, and ceramics. Further, the diameter-expanding member 4 in the present embodiment is a spherical shape having a diameter larger than the inner diameter of the inner peripheral portion of the attachment portion 21 of the connecting member 2 before plastic deformation and smaller than the inner diameter of the inner peripheral portion of the male screw portion 22. Has been.
- the diameter-expanding member 4 has a rear end side on the inner peripheral portion of the connecting member 2 in a state where the front end surface of the male screw portion 22 is in contact with the rear end surface of the tapered shaft portion 13.
- the pressing portion F is pressed in the press-fitting direction F toward the front end side in the axis O direction by the punch P having a front end shaft portion having an outer diameter slightly smaller than the diameter of the diameter-expanding member 4. It is press-fitted while being plastically deformed so as to expand and expand to the side, and is left in the inner peripheral portion of the connecting member 2 in the mounting portion 21 and fixed without coming out of the mounting portion 21 as shown in FIG. Is done.
- the inner diameter of the inner peripheral portion of the mounting portion 21 is larger than the portion of the diameter-expanding member 4 on the press-fitting direction F side (front end side in the axis O direction).
- the portion on the rear side in the press-fitting direction F (the rear end side in the axis O direction) with the diameter member 4 interposed therebetween is larger, and the outer peripheral surface of the mounting portion 21 is pressed tightly against the inner peripheral surface of the mounting hole 16.
- a part of the outer peripheral surface of the mounting portion 21 is engaged with the annular groove 16a as a recess formed in the inner peripheral surface of the mounting hole 16 by plastic deformation.
- the connecting member 2 is prevented from coming off in the direction of the axis O with respect to the head main body material 1A and the head main body 1, and the relative rotation around the axis O is caused by the close contact between the outer peripheral surface of the mounting portion 21 and the inner peripheral surface of the mounting hole 16. Is also restrained and firmly integrated.
- the diameter-expanding member 4 is fixed to the inner peripheral portion of the connecting member 2 in the attachment portion 21 as described above, and the position where the outer diameter in the cross section orthogonal to the axis O is the maximum.
- the head main body material 1A is positioned at the engaging portion 12 in the head main body 1, and the connecting member 2 is an attachment portion.
- the tip 21 is located at the portion where the groove 21a is formed.
- the groove 21a is located on the front end side and the rear end side in the direction of the axis O rather than the diameter-expanding member 4 to which the front end and the rear end in the direction of the axis O are fixed in this way, and is attached to the inside of the mounting hole 16. It is formed so as to open to the inner peripheral portion of the portion 21, that is, so as to straddle the position where the outer diameter in the cross section perpendicular to the axis O of the fixed diameter-expanding member 4 is maximized in the direction of the axis O. Has been.
- the head main body material 1A to which the connecting member 2 is attached is formed with the chip discharge groove 14, the outer peripheral edge 15a, the bottom edge 15b, and the cutting edge made of the corner edge 15c.
- the said branch hole 18 branched from the coolant hole 17 at this time is each opened by the bottom face of each chip discharge groove
- the male screw portion 22 of the connecting member 2 is screwed into a female screw portion (not shown) formed on the inner peripheral portion of the cylindrical shaft-shaped holder 3, thereby
- the rear end surface is brought into contact with the front end surface of the holder 3, and the outer peripheral surface of the taper shaft portion 13 gradually increases in diameter toward the front end side formed between the female screw portion and the front end surface of the holder 3 (not shown). It is brought into close contact with the inner peripheral surface of the tapered hole portion and connected to the holder 3 and used for cutting as described above.
- the connecting member 2 is attached to the attachment hole 16 formed in the head body material 1A of the head body 1 which is the tool body.
- the outer diameter of the mounting portion 21 is not plastically deformed so as to expand the diameter of the mounting portion 21 by pressing and extracting a punch having an outer diameter larger than the inner diameter thereof into the inner peripheral portion of the mounting portion 21. Is pressed into the inner peripheral portion of the attachment portion 21 by the punch P, and the attachment portion 21 is plastically deformed. Therefore, by making the outer diameter of the tip shaft portion of the punch P smaller than the diameter of the enlarged member 4, the punch It can be avoided that P itself contacts the inner peripheral portion of the attachment portion 21.
- the connecting member 2 is formed of a material having a hardness higher than that of the metal material, among the materials capable of plastic deformation, or more of the metal materials. Even if it is formed of a material having high hardness or the plastic deformation amount of the attachment portion 21 is set larger, the punch P is worn by contact with the inner peripheral portion of the attachment portion 21 of the connecting member 2. It is possible to prevent such damage. For this reason, it is possible to extend the life of the punch P, and it is possible to continuously mass-produce cutting heads having high bonding strength between the head body 1 and the connecting member 2 in this way.
- the diameter-expanding member 4 press-fitted by the punch P is left as it is in the inner peripheral portion of the attachment portion 21 of the connecting member 2.
- this diameter-expanding member 4 is formed of a material having a hardness higher than that of the material constituting the connecting member 2 in order to plastically deform the attachment portion 21 of the connecting member 2 so as to expand the diameter.
- the remaining diameter-expanding member 4 has a position where the outer diameter in the cross section orthogonal to the axis O is maximized in the direction of the axis O after the attachment portion 21 is expanded by plastic deformation.
- the head body 1 is positioned at the engaging portion 12.
- the engaging portion 12 is formed so as to be one step larger in diameter than the tapered shaft portion 13 having a small diameter on the rear end side of the head body 1, and is thus highly rigid. It is possible to firmly hold the attachment portion 21 plastically deformed between them, and to further improve the bonding strength.
- the diameter-expanding member 4 is spherical, and the portion of the diameter-expanding member 4 that faces the press-fitting direction F side (the front end side in the axis O direction) by the punch P has an outer diameter toward the press-fitting direction F. Is gradually reduced.
- a diameter-expanding member for example, a cylindrical member having a smaller diameter than the inner peripheral portion of the male screw portion 22 of the connecting member 2 before plastic deformation and a larger diameter than the inner peripheral portion of the mounting portion 21 is punched.
- the diameter-expanding member 4 is rearward in the press-fitting direction F of the spherical diameter-expanding member 4 as in the modification shown in FIG.
- the portion facing the side may be cut out by a flat surface perpendicular to the axis O.
- the tip end surface of the punch P is a flat surface, so that the diameter-expanding member 4 is pointed.
- a flat surface is formed on the rear side in the press-fitting direction F. If it is, it becomes a surface contact and can achieve more stable press-fitting.
- such a flat surface may be formed by crushing the rear side of the spherical diameter expanding member 4 in the press-fitting direction F by the punch P in the press-fitting process. Further, it may be a frustoconical taper pin whose outer diameter gradually decreases as it goes in the press-fitting direction F as will be described later, or may be a bullet shape.
- the cutting oil, compressed air, mist, etc. from the main shaft of the machine tool to which the holder 3 is attached to the inner peripheral portion of the cylindrical shaft holder 3.
- the coolant and the work material are cooled and lubricated by supplying the coolant and ejecting the coolant from the inner periphery of the connecting member 2 through the mounting hole 16, the coolant hole 17, and the branch hole 18.
- the diameter-expanding member 4 is left and sealed on the inner peripheral portion of the connecting member 2 as described above, such coolant cannot be supplied.
- a groove 21 a extending across the position where the outer diameter in the cross section perpendicular to the axis O of the diameter member 4 is the maximum in the direction of the axis O, that is, the front end and the rear end in the direction of the axis O are the front side and the rear of the diameter expanding member 4.
- a groove 21a that opens and communicates with the inner peripheral portion of the attachment portion 21 on the end side may be formed, and coolant may be supplied through the groove 21a.
- the groove 21a may be a slit-like one that penetrates the inner and outer peripheries of the mounting portion 21 in the radial direction as in the present embodiment, and is not crushed and sealed by the press-fitted diameter expanding member 4. Further, only the inner peripheral portion of the attachment portion 21 may be formed so as to extend in the axis O direction.
- the coolant hole 17 is formed in the head main body 1 (head main body material 1A) as in the modification of the embodiment shown in FIGS.
- the branch hole 18 may not be formed, and the connecting member 2 may be configured not to form the groove 21a as shown in FIG.
- the attachment portion 21 of the connecting member 2 is substantially completely cylindrical as shown in FIG.
- FIG. 9 shows a modification in which the diameter-expanding member 4 is a tapered pin as described above when the coolant is not supplied internally.
- the taper pin shown in FIG. 9 may be the diameter-expanding member 4 of the embodiment having the coolant hole 17 shown in FIGS. 1 to 6, and conversely, the spherical diameter-expanding member having the flat surface shown in FIG. 4 may be the diameter-expanding member 4 of the embodiment having no coolant hole shown in FIGS.
- the annular groove 16a that circulates around the axis O is formed as the concave portion of the inner peripheral portion of the mounting hole 16 of the head body 1 (head body material 1A).
- the inner peripheral surface of the mounting hole 16 is not polished or the like, and the inner peripheral surface is sintered with a powder sintered material such as the cemented carbide.
- the inner diameter of the mounting hole 16 is fixed by the engaging portion 12 of the head body 1 to which the diameter-expanding member 4 is left and fixed in the direction of the axis O. May be formed so as to be slightly increased, and the outer peripheral surface of the attachment portion 21 of the connection member 2 whose diameter is expanded by plastic deformation is engaged with this portion so that the connection member 2 is attached. Furthermore, grooves or spiral grooves extending in the direction of the axis O, or scattered dents or the like may be formed on the inner peripheral surface of the mounting hole 16 to form a recess.
- the connecting member 2 is joined using the head body 1 of the head exchangeable cutting tool as the tool body has been described, but the holder body of the holder 3 to which the head body 1 is attached is made of a hard material.
- the present invention can also be applied to form the female thread portion provided in the holder 3 as a connecting member and join it to the holder main body.
- the inner diameter of the inner peripheral portion of the attachment portion of the connecting member to be inserted into the attachment hole formed in the holder main body is made smaller than the inner diameter of the female screw portion, and the enlarged member is press-fitted into the inner peripheral portion of the attachment portion.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
- Drilling Tools (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
1A ヘッド本体素材
2 連結部材
3 ホルダ
4 拡径部材
11 刃部
12 係合部
13 テーパ軸部
14 切屑排出溝
15a 外周刃
15b 底刃
15c コーナ刃
16 取付孔
16a 環状溝(凹部)
17 クーラント孔
18 分岐孔
21 取付部
21a 溝
22 雄ねじ部
O ヘッド本体(工具本体)1の軸線(円筒状の取付部21の中心軸線)
T エンドミル回転方向
P パンチ(圧入部材)
F 圧入方向
Claims (3)
- 硬質材料よりなる工具本体に形成された内周面に凹部を有する取付孔に、上記硬質材料よりも硬度が低い金属材料よりなる連結部材の円筒状の取付部が挿入され、この取付部が拡径するように塑性変形させられて、該取付部の外周面が上記取付孔の内周面と密着させられて上記凹部と係合されることにより、これら工具本体と連結部材とが接合されたヘッド交換式切削工具であって、上記取付部の内周部には上記連結部材よりも硬度が高い拡径部材が圧入されて固定されており、この拡径部材によって上記取付部が塑性変形させられていることを特徴とするヘッド交換式切削工具。
- 上記拡径部材は、少なくとも上記取付部の内周部への該拡径部材の圧入方向側を向く部分が、この挿入方向に向かうに従い外径が漸次小さくなるように形成されていることを特徴とする請求項1に記載のヘッド交換式切削工具。
- 上記取付部の内周部には、該内周部に固定された上記拡径部材において上記取付部がなす円筒の中心軸線に直交する断面における外径が最大となる位置を、上記中心軸線方向に跨いで延びる溝が形成されていることを特徴とする請求項1または請求項2に記載のヘッド交換式切削工具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12830352.6A EP2754519B1 (en) | 2011-09-09 | 2012-08-30 | Exchangeable head cutting tool |
US14/237,799 US9517514B2 (en) | 2011-09-09 | 2012-08-30 | Exchangeable head cutting tool |
CN201280036804.6A CN103717335B (zh) | 2011-09-09 | 2012-08-30 | 头部交换式切削工具 |
KR1020147009026A KR101496107B1 (ko) | 2011-09-09 | 2012-08-30 | 헤드 교환식 절삭 공구 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011197074A JP5664506B2 (ja) | 2011-09-09 | 2011-09-09 | ヘッド交換式切削工具 |
JP2011-197074 | 2011-09-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013035619A1 true WO2013035619A1 (ja) | 2013-03-14 |
Family
ID=47832066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/071973 WO2013035619A1 (ja) | 2011-09-09 | 2012-08-30 | ヘッド交換式切削工具 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9517514B2 (ja) |
EP (1) | EP2754519B1 (ja) |
JP (1) | JP5664506B2 (ja) |
KR (1) | KR101496107B1 (ja) |
CN (1) | CN103717335B (ja) |
WO (1) | WO2013035619A1 (ja) |
Cited By (2)
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WO2015054708A1 (de) * | 2013-10-16 | 2015-04-23 | Ceratizit Austria Gesellschaft M.B.H. | Bearbeitungswerkzeug und verfahren zur herstellung eines bearbeitungswerkzeugs |
US10974329B2 (en) * | 2015-04-24 | 2021-04-13 | Guehring Kg | Lathe tool comprising a tapered coolant channel and offset coolant outlet lines and corresponding production method |
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US9555480B2 (en) * | 2013-08-19 | 2017-01-31 | The Boeing Company | Fluid-fed vacuum cutters |
PL3233340T3 (pl) * | 2014-12-15 | 2024-02-05 | Iscar Ltd. | Obrotowe narzędzie skrawające posiadające z góry określoną liczbę lewo i prawoskrętnych spiralnych rowków i zębów skrawających na powierzchni czołowej |
EP3042729B1 (en) * | 2015-01-12 | 2021-03-10 | Sandvik Intellectual Property AB | Ceramic milling cutter |
CN104708085B (zh) * | 2015-02-03 | 2017-11-28 | 机械科学研究总院先进制造技术研究中心 | 一种铣削喷液打印一体化装置 |
WO2016199935A1 (ja) * | 2015-06-12 | 2016-12-15 | 三菱マテリアル株式会社 | テーパエンドミルおよび切削ヘッド |
US9844817B2 (en) * | 2015-08-11 | 2017-12-19 | Iscar, Ltd. | Replaceable cutting head having threaded mounting portion with two spaced apart conical abutment surfaces provided with the same cone angle, tool holder and rotary cutting tool |
JP1563503S (ja) * | 2015-08-13 | 2016-11-21 | ||
WO2017094531A1 (ja) * | 2015-12-01 | 2017-06-08 | 三菱日立ツール株式会社 | 刃先交換式切削工具 |
WO2017105367A1 (en) * | 2015-12-14 | 2017-06-22 | Alp Havacilik Sanayi Ve Ticaret Anonim Sirketi | End-mills made of hard metal and ceramic combined by brazing method |
US10688570B2 (en) * | 2016-02-12 | 2020-06-23 | Mitsubishi Hitachi Tool Engineering, Ltd. | Indexable rotary cutting tool and insert |
US10335871B2 (en) * | 2016-04-12 | 2019-07-02 | Iscar, Ltd. | Replaceable face-milling head with integrally formed threaded shank-connector |
US10421135B2 (en) * | 2017-11-03 | 2019-09-24 | Kennametal Inc. | Rotary cutting tool with coolant passages and method of making same |
CN109396517B (zh) * | 2018-12-21 | 2024-01-23 | 成都美奢锐新材料有限公司 | 一种组装式高精度立铣刀具 |
CN112453440B (zh) * | 2019-09-09 | 2024-01-02 | 李佩玲 | 具有转动轴的加工机主轴结构 |
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- 2011-09-09 JP JP2011197074A patent/JP5664506B2/ja not_active Expired - Fee Related
-
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- 2012-08-30 KR KR1020147009026A patent/KR101496107B1/ko not_active IP Right Cessation
- 2012-08-30 WO PCT/JP2012/071973 patent/WO2013035619A1/ja active Application Filing
- 2012-08-30 EP EP12830352.6A patent/EP2754519B1/en not_active Not-in-force
- 2012-08-30 US US14/237,799 patent/US9517514B2/en not_active Expired - Fee Related
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US10974329B2 (en) * | 2015-04-24 | 2021-04-13 | Guehring Kg | Lathe tool comprising a tapered coolant channel and offset coolant outlet lines and corresponding production method |
Also Published As
Publication number | Publication date |
---|---|
CN103717335B (zh) | 2015-05-20 |
EP2754519B1 (en) | 2016-04-13 |
CN103717335A (zh) | 2014-04-09 |
KR20140071415A (ko) | 2014-06-11 |
EP2754519A4 (en) | 2015-05-20 |
US9517514B2 (en) | 2016-12-13 |
JP2013056404A (ja) | 2013-03-28 |
JP5664506B2 (ja) | 2015-02-04 |
US20140205389A1 (en) | 2014-07-24 |
EP2754519A1 (en) | 2014-07-16 |
KR101496107B1 (ko) | 2015-02-25 |
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