WO2013191259A1 - 切削インサート、該切削インサートを装着可能な工具本体及びこれらを備えた刃先交換式ボールエンドミル - Google Patents
切削インサート、該切削インサートを装着可能な工具本体及びこれらを備えた刃先交換式ボールエンドミル Download PDFInfo
- Publication number
- WO2013191259A1 WO2013191259A1 PCT/JP2013/066998 JP2013066998W WO2013191259A1 WO 2013191259 A1 WO2013191259 A1 WO 2013191259A1 JP 2013066998 W JP2013066998 W JP 2013066998W WO 2013191259 A1 WO2013191259 A1 WO 2013191259A1
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- WIPO (PCT)
- Prior art keywords
- cutting
- insert
- arcuate
- blade
- cutting insert
- 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
- 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
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- 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
- B23C5/2204—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert
- B23C5/2208—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts
- B23C5/2213—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts having a special shape
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/36—Other features of cutting inserts not covered by B23B2200/04 - B23B2200/32
- B23B2200/3627—Indexing
- B23B2200/3636—Indexing with cutting geometries differing according to the indexed position
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/12—Side or flank surfaces
- B23C2200/125—Side or flank surfaces discontinuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/12—Side or flank surfaces
- B23C2200/128—Side or flank surfaces with one or more grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/16—Supporting or bottom surfaces
- B23C2200/165—Supporting or bottom surfaces with one or more grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2200/00—Details of milling cutting inserts
- B23C2200/20—Top or side views of the cutting edge
- B23C2200/203—Curved cutting edges
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- 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
- B23C2210/168—Seats for cutting inserts, supports for replacable cutting bits
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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
- Y10T407/1924—Specified tool shape
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T407/00—Cutters, for shaping
- Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
Definitions
- the present invention relates to a cutting insert, a tool main body to which the cutting insert can be mounted, and a blade-end-changeable end mill having the cutting insert, and more particularly, a cutting insert for a ball end mill, a tool main body suitable for mounting the cutting insert, and the like.
- the present invention relates to a blade end replaceable ball end mill.
- a two-blade type is generally used as a blade end replaceable ball end mill.
- a three-blade type ball end mill is currently proposed. In this type of ball end mill, since three blades are involved in the cutting, it is possible to realize machining that is more efficient than that of the two-blade type.
- Patent Document 1 An example of a blade end replaceable ball end mill applicable to a three-blade type is disclosed in Patent Document 1.
- the ball end mill is a three-blade type including two inserts functioning as outer peripheral blades and one insert functioning as a central blade. It is suggested that it may be.
- the two inserts that function as outer peripheral blades are of the same type, and the upper and lower surfaces are each provided with cutting blades. Therefore, when one cutting blade is worn, each insert is inverted at the initial mounting position of the ball end mill. It is also suggested that it can be reattached or reused between the outer peripheral blades.
- Patent Document 1 the suggestion of Patent Document 1 is limited to them, and it is necessary to prepare a cutting insert for the central blade in addition to the cutting insert for the peripheral blade, so two types of cutting for the peripheral blade and the central blade are required. It becomes necessary to manage the insert, and the management becomes complicated. Further, since each cutting insert has only two cutting edges, the number of cutting inserts to be used increases, resulting in an increase in processing cost.
- This invention is made
- the cutting insert which makes it possible to use one type of cutting insert for both an outer periphery blade and a center blade, and the three blades which mounted it It is an object of the present invention to provide a tool body suitable for application to a blade end replaceable ball end mill and the ball end mill.
- the first embodiment of the present invention includes a first surface (2), a second surface (3) facing the first surface, and a side surface (4) connecting the first surface and the second surface.
- the cutting insert (1) composed at least of The intersecting ridge line between the first surface (2) and the side surface (4) has substantially arc-shaped first and second ridge lines facing each other, and the first and second arc-shaped ridge lines.
- the intersecting ridgeline between the second surface (3) and the side surface (4) has a substantially arcuate third ridgeline, and the third arcuate ridgeline is a third arcuate cutting edge.
- the most swollen portion of the arcuate cutting edge (9) and the most swollen ridge line (11) between the second surface (3) and the side surface (4b) facing the third arcuate cutting blade (9) Longer than the length of the line segment (L2) substantially perpendicular to the tangent line drawn on each of the parts, When viewed in a cross section substantially perpendicular to the intermediate line (ML), the one (8) of the first and second arcuate cutting edges (8, 10) and the third arcuate cutting edge (
- the angle ( ⁇ ) formed by the straight line (L3) connecting 9) with the first surface (2) is the same as the other (10) of the first and second arcuate cutting edges (8, 10).
- the angle ( ⁇ ) formed by the straight line (L4) connecting the intersecting ridge line (11) between the second surface (3) and the side surface (4b) with respect to the first surface (2) is different.
- the 2nd form of this invention is a substantially cylindrical tool main body (21) of a blade-tip-exchange-type ball end mill (20), Comprising: It is provided in a front-end
- the three insert seats (22) have two insert seats for outer peripheral blades and one insert seat for central blades, In one of the two insert seats for the outer peripheral blade, the one (8) of the first and second arcuate cutting blades (8, 10) is involved in cutting, In the other of the two insert seats for outer peripheral blades, the third arcuate cutting edge (9) is involved in cutting, In the center blade insert seat, the other (10) of the first and second arcuate cutting edges (8, 10) is involved in cutting, The cutting insert is mounted.
- the 3rd form of this invention provides the blade-end-exchange-type ball end mill (20) provided with the said tool main body (21) and the said cutting insert (1) with which this tool main body (21) was mounted
- FIG. 1 shows a perspective view of one embodiment of a cutting insert of the present invention. It is the perspective view which looked at one Embodiment of the cutting insert of this invention from the upper surface side, and shows what was seen from the direction different from FIG. 1A.
- the perspective view which looked at one Embodiment of the cutting insert of this invention from the lower surface side is shown.
- 1 shows a top view of one embodiment of a cutting insert of the present invention.
- FIG. The bottom view of one Embodiment of the cutting insert of this invention is shown.
- the side view which looked at one Embodiment of the cutting insert of this invention from the arrow IIIA direction of FIG. 1A is shown.
- the side view which looked at one Embodiment of the cutting insert of this invention from the arrow IIIB direction of FIG. 1A is shown.
- FIG. 1A The side view which looked at one Embodiment of the cutting insert of this invention from the arrow IIIC direction of FIG. 1A is shown.
- One Embodiment of the Cutting Insert of this Invention The side view seen from the arrow IIID direction of FIG. 1A is shown. It is a figure for demonstrating the virtual intermediate line ML and line segment L1 on an upper surface about the structure shown by FIG. 2A. It is a figure for demonstrating the virtual intermediate line ML and line segment L2 on a lower surface about the structure shown by FIG. 2B. It is a figure for demonstrating angles (alpha) and (beta) prescribed
- the front view of one Embodiment of the blade-tip-exchange-type ball end mill of this invention is shown.
- the tip end view of one Embodiment of the blade-tip-exchange-type ball end mill of this invention is shown.
- worn so that the outer peripheral blade of an upper surface side may participate in cutting is shown.
- worn so that the outer peripheral blade of a lower surface side may participate in cutting is shown.
- worn so that a center blade may participate in cutting is shown.
- worn so that the outer peripheral blade on the upper surface side may be concerned with cutting is shown.
- worn so that the outer peripheral blade of a lower surface side might be concerned with cutting is shown.
- worn so that a center blade might be concerned with cutting is shown.
- the cutting insert 1 of the present embodiment is formed when two circles are partially intersected in plan view, as shown in FIGS. 1A to 1C, 2A, and 3A to 3D.
- a first surface (hereinafter referred to as an upper surface) 2 having a shape like the intersection (hereinafter referred to as an “intersection of two circles”) is opposed to and substantially identical to the upper surface 2 in a substantially parallel state.
- the second surface 3 (hereinafter referred to as the lower surface) 3 and the side surface 4 connecting the upper surface 2 and the lower surface 3 are basically configured.
- a mounting hole 5 penetrating between the upper and lower surfaces 2 and 3 is provided at the approximate center between the upper surface 2 and the lower surface 3.
- the side surface 4 is divided into a side surface 4a and a side surface 4b with a ridge extending from the two top portions (corresponding to two points where the two circles intersect) 6 and 7 to the lower surface 3 as a boundary.
- the side surface 4 a is a side surface portion that intersects the upper surface 2 and the lower surface 3 substantially perpendicularly.
- the side surface 4b is a side surface portion that intersects the upper surface 2 at an acute angle, and intersects the lower surface 3 at an obtuse angle. That is, the side surface 4 a has a so-called negative relationship with respect to the upper surface 2 and the lower surface 3. Further, the side surface 4 b is in a so-called positive relationship with the upper surface 2.
- the side surface 4a and the side surface 4b are directly connected to the top portions 6 and 7 of the upper surface 2 and the lower surface 3, respectively, but the present invention is limited to this configuration. There is no. That is, at least one of the top portions 6 and 7 on at least one of the upper surface 2 and the lower surface 3 in a plan view may be cut out by a straight line or a curve. In this case, the side surface 4a and the side surface 4b are not directly connected.
- the arcuate intersection ridgeline between the upper surface 2 and the side surface 4a functions as the main cutting edge 8 which is the first arcuate cutting edge.
- the main cutting edge 8 functions as an outer peripheral edge in the ball end mill.
- the outer peripheral edge is a cutting edge that is arranged so as not to cut to the tool rotation axis when the cutting insert is mounted on a tool body of a ball end mill described later.
- An arcuate intersection ridgeline between the lower surface 3 and the side surface 4 a also functions as a main cutting edge (third arcuate cutting edge) 9.
- the main cutting edge 9 also functions as an outer peripheral edge in the ball end mill. That is, the intersecting ridgeline formed by the side surface 4a and the upper surface 2 or the lower surface 3 functions as an outer peripheral blade.
- the arcuate intersection ridgeline between the side surface 4b and the upper surface 2 also functions as the main cutting edge 10 (second arcuate cutting edge).
- This functions as a center blade in a ball end mill.
- the center blade is a cutting blade that is arranged so as to cut to the region on the tool rotation axis when the cutting insert is mounted on the ball end mill. That is, in this embodiment, as shown in FIG. 4A and FIG. 4B, a line drawn at an intermediate point between two opposing arc-shaped ridge lines (main cutting edges 8 and 10) on the upper surface 2 is an intermediate line.
- one arcuate cutting edge 8 on the upper surface 2 and an arcuate cutting edge 9 on the lower surface 3 are provided on one side surface 4a divided by the intermediate line ML, and are on the upper surface 2.
- One arcuate cutting edge 10 is provided on the other side surface 4b divided by the intermediate line ML. Therefore, the cutting insert of this embodiment has at least two main cutting edges 8 and 9 as outer peripheral edges and one main cutting edge 10 as a central edge.
- the angle formed between the side surface 4a and the upper surface 2 and the lower surface 3 and the angle formed between the side surface 4b and the upper surface 2 are not limited to the above-described angles, and the following two relationships may be satisfied. That is, the first is, as shown in FIGS.
- Escape portions 12 are provided at both ends of the main cutting blades 8 and 9 that function as outer peripheral blades, that is, at the ends near the top portions 6 and 7.
- the escape portion 12 does not function as a cutting edge. Therefore, the arc length of the main cutting edges 8 and 9 that function as the outer peripheral edge is shorter than the arc length of the main cutting edge 10 that functions as the center edge.
- the relief portion 12 is formed for the purpose of preventing both end portions of the outer peripheral blade from protruding toward the tool body line side of the center blade when the cutting insert 1 of the present embodiment is mounted on the ball end mill.
- the upper surface 2 functions as a rake face of the two main cutting edges 8 and 10 provided on the upper surface 2 side.
- the lower surface 3 functions as an insert fixing surface that contacts the tool body.
- the side surface 4a functions as a flank and the side surface 4b functions as an insert fixing surface that comes into contact with the tool body.
- the side surface 4b functions as a flank and the side surface 4a functions as an insert fixing surface that contacts the tool body.
- the lower surface 3 also functions as a rake face of the main cutting edge 9 provided on the lower surface 3 side.
- the upper surface 2 functions as an insert fixing surface that comes into contact with the tool body.
- the side surface 4a functions as a flank and the side surface 4b functions as an insert fixing surface that comes into contact with the tool body.
- the upper surface 2 may be formed with an inclined surface 2a that inclines toward the lower surface 3 as it is separated from the main cutting edges 8 and 10 toward the inside of the cutting insert.
- the inclined surface 2a provides a rake angle on the rake surface.
- the inclined surface 2a can be made continuous with the boss surface after being inclined from the main cutting edges 8 and 10 over a predetermined distance.
- the lower surface 3 may also be formed with an inclined surface 3 a that is inclined toward the upper surface 2 as the distance from the main cutting edge 9 increases.
- the inclined surface 3a provides a rake angle on the rake surface.
- the inclined surface 3a can be made continuous with the boss surface after inclining over a predetermined distance from the main cutting edge 9.
- the inclination angle that is, rake angle
- inclination width, and the like of these inclined surfaces can be appropriately changed in view of the required cutting performance and the like.
- the nick 13 may be formed on the side surface 4a.
- the nick 13 is linearly formed on the side surface 4 a so as to intersect the main cutting edges 8 and 9 substantially vertically across the upper surface 2 and the lower surface 3.
- the nicks 13 When viewed from the upper surface 2 or the lower surface 3, the nicks 13 have a half-moon shaped cross section, and three nicks 13 are provided at substantially equal intervals.
- the nick 13 is provided only on the main cutting edges 8 and 9, but the nick 13 can also be provided on the main cutting edge 10 formed by the upper surface 2 and the side surface 4b.
- the shape, number, or arrangement interval of the nicks 13 are not limited to those described above, and can be appropriately changed in view of the required cutting performance.
- the main cutting edges 8, 9, 10 gradually decrease the thickness of the cutting insert 1 from the tops 6, 7 side toward the cutting edge central side along the main cutting edges 8, 9, 10. You may have the structure which inclines so that it may increase gradually. That is, the ink cutting may be provided on the main cutting edges 8, 9, and 10.
- a recess 14 is preferably formed on the lower surface 3 along a part of the side surface 4b.
- the recess 14 is provided on the lower surface 3 with a width equal to the diameter of the mounting hole 5 from the mounting hole 5 to the side surface 4b. Therefore, when the cutting insert 1 of the present embodiment is viewed from the side as shown in FIG. 3D, the intersecting ridge line 11 between the lower surface 3 and the side surface 4b has a shape in which a part is cut out in the vicinity of the approximate center. .
- the recess 14 provided on the lower surface 3 functions as a detent mechanism and a mounting error prevention mechanism for the cutting insert 1 when the cutting insert 1 of the present embodiment is mounted on the tool body.
- the width, the notch depth, and the like of the recess 14 can be appropriately changed as long as they function as a detent mechanism and an attachment error prevention mechanism. Since the recessed part 14 is provided in the intersection ridgeline 11 of the side surface 4b and the lower surface 3, the function of the three main cutting edges 8, 9, and 10 used is not inhibited.
- the cutting insert 1 of the present embodiment having the above-described configuration has functions and effects described below.
- the cutting insert 1 of the present embodiment has the main cutting edge 8 functioning as the outer peripheral edge and the main cutting edge 10 functioning as the central edge on the upper surface 2, and functions as the outer peripheral edge on the lower surface 3.
- the main cutting edges 8, 9, and 10 satisfy the above-described two relationships. In this way, in a three-blade type blade end replaceable ball end mill, all the three pieces of the ball end mill can be cut with only one type of cutting insert 1 by appropriately reversing the mounting direction of the upper and lower surfaces and the mounting direction of the base end / terminal end. It is possible to cover the function of the blade.
- An angle ⁇ formed by the straight line L4 connecting the arcuate cutting edge 10 and the intersecting ridge line 11 on the lower surface 3 side and the upper surface 2 is an acute angle. That is, it is preferable that the upper surface 2 and the side surface 4b have a positive relationship. This is because the cutting performance of the ball end mill can be further improved when the main cutting edge 10 that functions as a center cutting edge with a wide cutting area is positive.
- the angle ⁇ formed by the upper surface 2 and the lower surface 3 is substantially a right angle as described above.
- the side surface 4a, the upper surface 2 and the lower surface 3 are set so that the two main cutting edges 8 and 9 functioning as outer peripheral blades are negative. More preferably, the crossing at a substantially right angle.
- one of the two main cutting edges 8, 9 functioning as the outer peripheral edge does not become a complete negative (that is, the clearance angle is less than 0 °), so that the three cutting edges 8, 9, 10 As a whole, the optimum cutting ability can be exhibited.
- the outer peripheral edge is also a cutting edge responsible for rough machining, it is preferable that the outer peripheral edge is a negative having high cutting edge strength.
- the blade end replaceable ball end mill 20 of this embodiment is a three-blade type, and three insert seats 22 are provided at the tip of a substantially cylindrical tool body 21. Is provided. Further, three chip pockets 27 are provided adjacent to the three insert seats 22. As shown in FIG. 6B, the three insert seats 22 may be provided at substantially equal angles when the substantially cylindrical tool body 21 is viewed from the front end surface, and the angles between them may be uneven. It may be provided. These insert seats 22 are composed of a bottom surface 23 and a side surface 24 having a shape similar to the outline shape of the cutting insert 1 described above. A screw hole 25 for attaching the cutting insert 1 is provided in the vicinity of the approximate center of the insert seat bottom 23.
- the cutting insert 1 is mounted such that the upper surface 2 or the lower surface 3 contacts the insert seat bottom surface 23 and the side surface 4 a or the side surface 4 b contacts the insert seat side surface 24. At that time, the three cutting inserts 1 can be mounted such that the three main cutting edges 8, 9, 10 are involved in the cutting.
- the upper surface 2 becomes a rake face and the side surface 4a becomes a flank surface, so that the lower surface 3 and the side surface 4b are respectively It functions as a contact surface that contacts the bottom surface 23 and the side surface 24 of the insert seat 22.
- the bottom surface 23 and the side surface 24 of the insert seat 22 have a shape suitable for the contact, and the side surface 24 has an inclination that intersects the bottom surface 23 at an obtuse angle.
- the lower surface 3 becomes a rake face and the side surface 4a becomes a flank surface, so that the upper surface 2 and the side surface 4b are respectively It functions as a contact surface that contacts the bottom surface 23 and the side surface 24 of the insert seat 22.
- the bottom surface and the side surface 24 of the insert seat 22 have a shape suitable for the contact, and the side surface 24 has an inclination that intersects the bottom surface 23 at an acute angle.
- the upper surface 2 is a rake face and the side surface 4b is a flank surface, so that the lower surface 3 and the side surface 4a are respectively , Function as a contact surface that contacts the bottom surface 23 and the side surface 24 of the insert seat 22.
- the bottom surface 23 and the side surface 24 of the insert seat 22 have a shape suitable for the contact, and the side surface 24 intersects the bottom surface 23 substantially perpendicularly.
- the rotation locus of the nick portion of the main cutting edge 8 that functions as one outer peripheral edge is the main cutting edge that functions as the other outer peripheral edge.
- the cutting insert 1 is mounted on the ball end mill 20 so as not to overlap with the rotation locus of the nick portion 9. That is, the cutting insert 1 is disposed on the ball end mill 20 so that the trajectories of the nicks 13 of the two main cutting edges 8 and 9 that function as outer peripheral edges do not intersect each other on the rotation trajectory when the ball end mill 20 rotates. Has been. Therefore, since the portion left uncut by the nick 13 is always cut by another cutting edge, it is prevented that the uncut portion remains on the work material.
- the three insert seats 22 are provided with a convex portion 26 so as to correspond to the concave portion 14 depending on the mounting state of the cutting insert 1. That is, as shown in FIG. 7, in the insert seat 22 where the cutting insert 1 is mounted so that the main cutting edge 8 functioning as the outer peripheral blade on the upper surface 2 side is involved in cutting, A convex portion 26 corresponding to the concave portion 14 provided on the lower surface 3 of the cutting insert 1 is provided from a substantially central portion of the intersecting ridge line between the insert seat bottom surface 23 and the insert seat side surface 24 to the screw hole 25.
- the length (width) along the intersecting ridge line of the convex portion 26 substantially matches the width of the concave portion 14 of the cutting insert 1. Since the concave portion 14 of the cutting insert 1 and the convex portion 26 of the insert seat 22 are engaged, as shown in FIG. 10, the main cutting edge 8 that functions as an outer peripheral blade on the upper surface 2 side is provided on the insert seat 22.
- the cutting insert 1 can be mounted so as to participate in cutting.
- a convex portion 26 is provided at a certain distance from the insert seat bottom surface 23 at a position substantially in the center of the intersecting ridge line between the insert seat bottom surface 23 and the insert seat side surface 24. More specifically, the insert seat side surface 24 is cut out at an angle that follows the side surface 4b of the cutting insert 1, but a convex portion 26 that protrudes toward the insert seat bottom surface 23 is left in a part of the cut surface. Yes.
- the convex portion 26 formed by such a notch is formed at a height that can be engaged with the concave portion 14 of the cutting insert 1, and the width thereof substantially coincides with the width of the concave portion 14 of the cutting insert 1. Yes. Since the concave portion 14 of the cutting insert 1 and the convex portion 26 of the insert seat 22 are engaged, as shown in FIG. 11, the main cutting edge 9 that functions as an outer peripheral blade on the lower surface 3 side is provided on the insert seat 22.
- the cutting insert 1 can be mounted so as to participate in cutting.
- a convex portion 26 is provided from the substantially central portion of the intersecting ridge line between the seat bottom surface 23 and the outer peripheral surface of the tool body 21 to the screw hole 25.
- the length (width) along the intersecting ridge line of the convex portion 26 substantially matches the width of the concave portion 14 of the cutting insert 1. Since the concave portion 14 of the cutting insert 1 and the convex portion 26 of the insert seat 22 are engaged, as shown in FIG. 12, the main cutting edge 10 that functions as a central blade is involved in this insert seat 22 in cutting. Thus, the cutting insert 1 can be mounted.
- the shape of the convex part 26 of these insert seats 22 can be appropriately changed according to the concave part 14 of the cutting insert 1 and is not limited to the one shown in the figure.
- the first effect is to prevent the cutting insert 1 from rotating on the insert seat 22. Since the cutting insert 1 has a shape like an intersection of two circles in plan view, the main cutting edges 8, 9, and 10 have an arc shape, and the cutting insert 1 is attached to the mounting hole 5 by cutting resistance. May move so as to rotate around the center. When the cutting insert 1 moves in this way, the accuracy of the cutting process may deteriorate. However, by providing the concave portion 14 and the convex portion 26 that engage the cutting insert 1 and the insert seat 22 as described above, the rotation of the cutting insert 1 can be suppressed. When the engaging portion is on the intersecting ridge line of the cutting insert 1 (that is, outside), it is possible to exert a further suppressing effect on the rotation.
- the second effect is to prevent mistakes in attaching the cutting insert 1 by the operator.
- the three cutting inserts 1 mounted on the ball end mill 20 are of the same type, while the main cutting edges 8, 9, and 10 have a distinction between a peripheral cutting edge and a central cutting edge. Therefore, in order to reuse one type of cutting insert 1, an operator is required to mount the cutting insert 1 on an appropriate insert seat 22 in an appropriate direction so that the main cutting edge according to the application is involved in the cutting. However, it is possible that a mounting error will occur. If the cutting insert 1 is installed incorrectly, the desired cutting performance cannot be achieved.
- the orientation of the cutting insert 1 and the insert seat 22 are made to correspond one-to-one as described above, that is, the cutting insert 1 is mounted only in a specific direction in a specific insert seat 22. By preventing this from happening, it is possible to prevent an erroneous installation by the operator.
- one type of cutting insert 1 is reused, for example, the cutting insert 1 (the state shown in FIG. 10) mounted so that one outer peripheral blade 8 is involved in cutting, and the other outer peripheral cut.
- the cutting insert 1 (the state shown in FIG. 11) attached so that the blade 9 is involved in cutting and the cutting insert 1 (the state shown in FIG. 12) attached so that the central blade 10 is involved in cutting are respectively connected to the other.
- the outer peripheral cutting edge 9 is attached to the corresponding insert seat 22 so as to be involved in cutting (state of FIG. 11), the central blade 10 is attached to the corresponding insert seat 22 so as to be involved in cutting (state of FIG. 12), and
- the change of arrangement is such that one outer peripheral cutting edge 9 is attached to the corresponding insert seat 22 so as to be involved in the cutting (state of FIG. 10).
- an additional insert seat 30 on which an additional cutting insert can be mounted on the proximal end side of the tool body 21 when viewed from the chip pocket 27. Is provided.
- the number and shape of the additional cutting inserts and insert seats can be appropriately changed according to desired cutting conditions.
- cutting insert 1 of the present invention is not limited to a blade end replaceable ball end mill, and can be used for other types of blade end replaceable end mills and other cutting tools.
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Abstract
Description
前記第1面(2)と前記側面(4)との交差稜線は対向した実質的に円弧状の第1および第2の稜線を有しているとともに、該第1および第2の円弧状稜線はそれぞれ第1および第2の円弧状切れ刃(8,10)を成し、
前記第2面(3)と前記側面(4)との交差稜線は実質的に円弧状の第3の稜線を有しているとともに、該第3の円弧状稜線が第3の円弧状切れ刃(9)を成し、
前記第1および第2の円弧状切れ刃(8,10)間の中間地点に引かれた線を中間線(ML)と定義するとき、
前記第1及び第2の円弧状切れ刃(8,10)の一方(8)と前記第3の円弧状切れ刃(9)は前記中間線(ML)の一方側の側面(4a)にあり、前記第1および第2の円弧状切れ刃の他方(10)は前記中間線(ML)の他方側の側面(4b)にあり、
前記第1及び第2の円弧状切れ刃(8,10)のそれぞれの最膨出部に引いた接線に対して略垂直な方向の線分(L1)の長さが、前記第3の円弧状切れ刃(9)の最膨出部及び該第3の円弧状切れ刃(9)と対向する前記第2面(3)と前記側面(4b)との交差稜線(11)の最膨出部のそれぞれに引いた接線に対して略垂直な線分(L2)の長さよりも長く、
前記中間線(ML)に対して略垂直な断面で見たとき、前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)と前記第3の円弧状切れ刃(9)とを結ぶ直線(L3)が前記第1面(2)に対してなす角度(α)は、前記第1および第2の円弧状切れ刃(8,10)の前記他方(10)と、前記第2面(3)と前記側面(4b)との交差稜線(11)とを結ぶ直線(L4)が前記第1面(2)に対してなす角度(β)は異なっていることを特徴とする。
前記3つのインサート座(22)は、2つの外周刃用インサート座と、1つの中心刃用インサート座と、を有し、
前記2つの外周刃用インサート座の一方には、前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)が切削に関与するように、
前記2つの外周刃用インサート座の他方には、前記第3の円弧状切れ刃(9)が切削に関与するように、
前記中心刃用インサート座には、前記第1及び第2の円弧状切れ刃(8,10)の前記他方(10)が切削に関与するように、
前記切削インサートが装着されることを特徴とする。
・上面2の2つの円弧状切れ刃8,10の接線に対して略垂直であり且つ2つの円弧状切れ刃8,10の間の距離(すなわち、2つの円弧状切れ刃8,10の間において、2つの円弧状切れ刃8,10の最膨出部に引いた接線に対して略垂直な方向の線分L1の長さ)は、下面3の円弧状切れ刃9の最膨出部に引いた接線、及び、その円弧状切れ刃と対向している、下面3と側面4bとの交差稜線11の最膨出部に引いた接線間の距離(すなわち、それらの接線間においてそれらの接線に対して略垂直な方向の線分L2の長さ)よりも長い、
という関係である。
・中間線MLに対して略垂直な断面で見たとき、中間線MLの一方側の側面4aが上面2と交差することで形成される円弧状切れ刃8と下面3と交差することで形成される円弧状切れ刃9とを結ぶ直線L3が上面2に対してなす角度αは、中間線MLの他方側の側面4bが上面2と交差することで形成される円弧状切れ刃10と下面3の交差稜線11とを結ぶ直線L4が上面2に対してなす角度βとは異なっている、
という関係である。以上の2つの関係を満たしている限り、側面4a又は側面4bと上面2又は下面3とのなす角度は適宜変更することが可能である。
Claims (13)
- 第1面(2)と、該第1面に対向する第2面(3)と、前記第1面及び第2面を接続する側面(4)と、から少なくとも構成される切削インサート(1)において、
前記第1面(2)と前記側面(4)との交差稜線は対向した実質的に円弧状の第1および第2の稜線を有しているとともに、該第1および第2の円弧状稜線はそれぞれ第1および第2の円弧状切れ刃(8,10)を成し、
前記第2面(3)と前記側面(4)との交差稜線は実質的に円弧状の第3の稜線を有しているとともに、該第3の円弧状稜線が第3の円弧状切れ刃(9)を成し、
前記第1および第2の円弧状切れ刃(8,10)間の中間地点に引かれた線を中間線(ML)と定義するとき、
前記第1及び第2の円弧状切れ刃(8,10)の一方(8)と前記第3の円弧状切れ刃(9)は前記中間線(ML)の一方側の側面(4a)にあり、前記第1および第2の円弧状切れ刃の他方(10)は前記中間線(ML)の他方側の側面(4b)にあり、
前記第1及び第2の円弧状切れ刃(8,10)のそれぞれの最膨出部に引いた接線に対して略垂直な方向の線分(L1)の長さが、前記第3の円弧状切れ刃(9)の最膨出部及び該第3の円弧状切れ刃(9)と対向する前記第2面(3)と前記側面(4b)との交差稜線(11)の最膨出部のそれぞれに引いた接線に対して略垂直な線分(L2)の長さよりも長く、
前記中間線(ML)に対して略垂直な断面で見たとき、前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)と前記第3の円弧状切れ刃(9)とを結ぶ直線(L3)が前記第1面(2)に対してなす角度(α)は、前記第1および第2の円弧状切れ刃(8,10)の前記他方(10)と、前記第2面(3)と前記側面(4b)との交差稜線(11)とを結ぶ直線(L4)が前記第1面(2)に対してなす角度(β)は異なっていることを特徴とする切削インサート。 - 前記第1及び第2の円弧状切れ刃(8,10)の前記他方(10)と、前記第2面(3)と前記側面(4b)との交差稜線(11)とを結ぶ直線(L4)が、前記第1面(2)に対してなす角度(β)は鋭角であることを特徴とする請求項1に記載の切削インサート。
- 前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)と、前記第3の円弧状切れ刃(9)とを結ぶ直線(L3)が前記第1面(2)及び前記第2面(3)に対してなす角度は略直角であることを特徴とする請求項2に記載の切削インサート。
- 前記第2面(3)には、前記中間線(ML)の前記他方側の側面(4b)に隣接して凹部(14)が設けられていることを特徴とする請求項1から請求項3のいずれか一項に記載の切削インサート。
- 前記凹部(14)は、前記第1面(2)と前記第2面(3)とを貫通する取付穴(5)から前記中間線(ML)の他方側の側面(4b)まで一定の幅で設けられていることを特徴する請求項4に記載の切削インサート。
- 前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)と前記前記第3の円弧状切れ刃(9)とを有する前記側面(4a)には、前記第1面(2)及び第2面(3)に略直交する方向にニック(13)が設けられていることを特徴とする請求項1から請求項5のいずれか一項に記載の切削インサート。
- 前記第1面(2)及び第2面(3)は、平面視にて、2つの円を部分的に交わらせた当該交わり部のような形状を有していることを特徴とする請求項1から請求項6のいずれか一項に記載の切削インサート。
- 刃先交換式ボールエンドミル(20)の工具本体(21)に装着されることを特徴とする請求項1から請求項7のいずれか一項に記載の切削インサート。
- 前記刃先交換式ボールエンドミル(20)の前記工具本体(21)に装着されたときに、前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)および前記第3の切れ刃(9)は前記工具本体(21)の回転軸上までは切削を行わないように配置される外周切れ刃(8,9)として機能し、前記第1及び第2の円弧状切れ刃(8,10)の前記他方(10)は前記回転軸上の領域まで切削を行うように配置される中心刃として機能することを特徴とする請求項8に記載の切削インサート。
- 刃先交換式ボールエンドミル(20)の略円筒形状の工具本体(21)であって、先端部に設けられ、請求項1から9のいずれか一項に記載の切削インサートを装着可能な3つのインサート座(22)を備え、
前記3つのインサート座(22)は、2つの外周刃用インサート座と、1つの中心刃用インサート座と、を有し、
前記2つの外周刃用インサート座の一方には、前記第1及び第2の円弧状切れ刃(8,10)の前記一方(8)が切削に関与するように、
前記2つの外周刃用インサート座の他方には、前記第3の円弧状切れ刃(9)が切削に関与するように、
前記中心刃用インサート座には、前記第1及び第2の円弧状切れ刃(8,10)の前記他方(10)が切削に関与するように、
前記切削インサートが装着されることを特徴とする工具本体(21)。 - 前記切削インサート(1)は、請求項4又は5に記載の切削インサートであり、
前記2つの外周刃用インサート座の前記一方には、インサート座底面(23)とインサート座側面(24)との交差稜線に接するように、インサート座底面(23)上に凸部(26)が設けられており、
前記外周刃用インサート座の他方には、インサート座側面(23)上に凸部(26)が設けられており、
前記中心刃用インサート座には、インサート座底面(23)と工具本体(21)外周面との交差稜線に接するように、インサート座底面(23)上に凸部(26)が設けられており、
前記切削インサート(1)の前記凹部(14)と前記インサート座(22)のそれぞれの凸部(26)とが係合関係にあることを特徴とする請求項10に記載の工具本体(21)。 - 請求項10に記載の工具本体(21)と、該工具本体(21)に装着された請求項1から9のいずれか一項に記載の切削インサート(1)と、を備えたことを特徴とする刃先交換式ボールエンドミル(20)。
- 請求項11に記載の工具本体(21)と、該工具本体(21)に装着された請求項4又は5に記載の切削インサート(1)と、を備えたことを特徴とする刃先交換式ボールエンドミル(20)。
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EP13806337.5A EP2865473B1 (en) | 2012-06-21 | 2013-06-20 | Cutting insert, tool body on which said cutting insert may be mounted, and replaceable-blade-type ball-end mill provided therewith |
CN201380032308.8A CN104364040B (zh) | 2012-06-21 | 2013-06-20 | 切削刀片、能够装接该切削刀片的工具主体及具备该切削刀片和工具主体的刀头更换式球头立铣刀 |
JP2014521514A JP5825435B2 (ja) | 2012-06-21 | 2013-06-20 | 切削インサート、該切削インサートを装着可能な工具本体及びこれらを備えた刃先交換式ボールエンドミル |
US14/409,505 US9511426B2 (en) | 2012-06-21 | 2013-06-20 | Cutting insert, tool body on which said cutting insert may be mounted, and replaceable-blade-type ball-end mill provided therewith |
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US10722954B2 (en) * | 2018-10-11 | 2020-07-28 | The Boeing Company | Dual cutting milling tools and related methods |
JP6744599B1 (ja) * | 2019-03-01 | 2020-08-19 | 株式会社タンガロイ | 切削インサート |
CN110293256A (zh) * | 2019-05-31 | 2019-10-01 | 南京理工大学 | 一种可转位的微织构球头铣刀 |
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- 2013-06-20 EP EP13806337.5A patent/EP2865473B1/en active Active
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JP5825435B2 (ja) | 2015-12-02 |
JPWO2013191259A1 (ja) | 2016-05-26 |
US20150196963A1 (en) | 2015-07-16 |
CN104364040B (zh) | 2016-08-31 |
CN104364040A (zh) | 2015-02-18 |
US9511426B2 (en) | 2016-12-06 |
EP2865473A1 (en) | 2015-04-29 |
EP2865473B1 (en) | 2019-07-31 |
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