WO2004058438A1 - ラジアスエンドミル - Google Patents
ラジアスエンドミル Download PDFInfo
- Publication number
- WO2004058438A1 WO2004058438A1 PCT/JP2003/016477 JP0316477W WO2004058438A1 WO 2004058438 A1 WO2004058438 A1 WO 2004058438A1 JP 0316477 W JP0316477 W JP 0316477W WO 2004058438 A1 WO2004058438 A1 WO 2004058438A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tip
- end mill
- blade
- corner
- rake face
- Prior art date
Links
Classifications
-
- 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
- B23C5/109—Shank-type cutters, i.e. with an integral shaft with 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
-
- 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
-
- 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
- B23C2200/00—Details of milling cutting inserts
- B23C2200/20—Top or side views of the cutting edge
- B23C2200/203—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/40—Flutes, i.e. chip conveying grooves
-
- 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
- B23C2270/08—Clamping mechanisms or provision for clamping
-
- 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
- Y10T407/1946—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
- Y10T407/1946—Face or end mill
- Y10T407/1948—Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
-
- 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
- Y10T407/1952—Having peripherally spaced teeth
- Y10T407/1962—Specified tooth shape or spacing
-
- 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
- Y10T83/00—Cutting
- Y10T83/929—Tool or tool with support
- Y10T83/9372—Rotatable type
Definitions
- the present invention relates to a radius end mill used for cutting a workpiece such as a mold.
- Japanese Patent Application Laid-Open No. 59-1755915 discloses an example of a radius end mill in which a corner blade where a bottom blade and an outer peripheral blade intersect is formed in a convex arc shape and is used for cutting a workpiece. Something like that.
- this radius-send mill is an end mill with a bottom edge 2 at the tip of a tool body 1 and an outer edge 3 with a predetermined twist angle ⁇ i on the outer periphery.
- the torsion angle 0 2 of the corner blade 4 is smaller than the torsion angle 0 of the outer peripheral blade 3 connected to the corner blade 4, and the corner blade 4 has a corner R.
- the edge corner since the torsion angle is 0 2 near the tip of the corner blade 4, the edge corner does not become an extremely sharp angle, the corner radius can be easily added and the accuracy can be maintained, and the edge corner portion is formed.
- the blade Since the blade is thin and the blade does not break, and the outer peripheral blade 3 which is the center of cutting has a strong torsion angle 0 with good machinability, easy-to-cut materials such as titanium alloy and stainless steel are difficult to cut. It is said that cutting can be performed well, and tool cost can be reduced and the work efficiency of milling can be significantly improved.
- the torsion angle ⁇ 2 of the corner blade 4 provided with the corner radius at the tip side of the outer peripheral edge 3 is weakened, that is, the corner blade 4 and the corner blade 4 are connected to each other.
- the edge angle of the bottom blade 2 and the corner blade 4 can be increased, thereby preventing the chipping as described above.
- the sharpness is unavoidable.
- the cutting depth is small and the center of In the case of the bottom edge 2 instead of the side, the cutting speed is slow on the inner peripheral side of the bottom edge 2 because the distance from the center axis O of the tool body 1 is short, and therefore the load during cutting increases.
- the cutting load is rather small on the bottom edge 2 on the outer peripheral edge 4 due to the high cutting speed, and a sharper cutting edge is required than the edge strength.
- a radius end mill in which the rake angle in the axial direction is reduced from the cutting edge 2 to the corner cutting edge 4, there is a possibility that the cutting resistance may be increased.
- the corner blade 4 provided with a corner radius near the cutting edge corner is often used. If the cutting edge is not sharp enough and the cutting force is large, there is no hope of improving machining efficiency. Furthermore, in the Rajiasuendo mill of the slave 5 (5, provided with a gradually increasing section 5 of the twist angle reaches the twist-that angle 0 of strong constant from the outer peripheral edge 3 is twisted theta 2 which is connected to the corner cutting edge 4, Since the torsion angle is changed variously, the rake face connected to the cutting edge 4 is also made a smoothly continuous face so that its inclination changes gradually / i. The generated chips flowed out along such a rake face in a stretched manner, and there was a problem that the chip processing performance was deteriorated.
- Fig. 32 is an enlarged view of the main part of this conventional radius end mill, which shows the inner edge 2B of the rake face 2A of the bottom blade 2 (the rake face 2A and the tool rotation direction T forward from the rake face 2A).
- corner blade 4 that forms an intersection (corner portion) between the outer peripheral blade 3 and the bottom blade 2.
- Radius end mills where the ratio r / D of the radius of curvature r of the substantially circular arc to the diameter D of the tool body 1 is set to 0.2 or more, or the radius of curvature r of the substantially circular arc formed by the corner blade 4
- the corner edge 4 becomes larger, and the inner edge 2 extends from the bottom edge 2 and the corner edge 4. Since the interval between B and 4B tends to be small, the tendency of the chip dischargeability to deteriorate as described above has become prominent.
- the present invention has been made under such a background, and a convex arc-shaped corner provided with a corner radius on the outer peripheral side while sufficiently securing the edge strength on the inner peripheral side of the bottom blade. It is an object of the present invention to provide a radius end mill capable of giving a sharp edge to a blade and further improving the disposability of chips generated by the corner blade.
- the present invention forms a helically twisted chip discharge groove around the tip of a tool body that is rotated around an axis, and changes the tool rotation direction of the chip discharge groove.
- a main gear surface is formed in which the inclination angle with respect to the axis is smaller than the twist angle of the chip discharge groove, and a bottom blade is formed at the front end of the main gear surface.
- a sub-gash surface whose inclination angle with respect to the axis is larger than that of the main mesh surface is set back with respect to the main mesh surface via a step.
- a corner blade having a substantially convex arc shape from the tip to the outer periphery of the sub-gush surface is formed so as to be continuous with the outer periphery of the bottom blade.
- a main gear surface that is inclined with respect to the axis at an angle smaller than the twist angle of the chip discharge groove is formed on the inner peripheral side of the tip of the chip discharge groove, Since the bottom edge is formed at the tip, the tip angle of this bottom edge can be increased, and the above-mentioned large cutting load can be applied. However, it is possible to secure a sufficient cutting edge strength.
- a sub-gash surface whose inclination angle with respect to the axis is larger than that of the main shingle surface is formed.
- this corner blade Since this corner blade is formed, the rake angle in the axial direction of this corner blade can be made larger than that of the bottom blade, and it is possible to give a sharp cutting edge.
- the sub-gash surface which is a rake face connected to the corner blade, is retreated through a stepped portion with respect to the main lash surface, which is a rake surface of the bottom blade, and therefore, the chips generated by the corner blade are formed.
- the chips By causing the chips to collide with the stepped portion, the chips are curled or cut by giving resistance before the chips gradually flow out, so that the chip processing performance can be improved.
- the step between the main and sub-gash surfaces is formed, for example, perpendicular to the sub-gash surface, the chips generated by the corner blades as described above will generate this chip.
- the chip is clogged and the chip discharge performance is impaired, which may hinder the smooth chip processing.
- this stepped part is directed from the main gear surface to the auxiliary gear surface. It is desirable to make the slope gradually recede accordingly.
- the inclination angle of the inclined surface formed by the step portion is in the range of 30 to 60 ° with respect to the direction perpendicular to the sub-gashsh surface. This is because if the inclination angle is less than 30 ° and the rising of the step is steep, the above-mentioned chip clogging may not be sufficiently prevented, while the inclination angle is more than 60 ° If the slope is gentle, there is a risk that sufficient resistance will be given to the colliding chips, making it impossible to carry out reliable treatment.
- the inclined surface may be a flat surface having the above-mentioned inclined angle fixed, but if the inclined surface is a concave curved surface, a collision occurs. Chips can be curled more easily, and more reliable chip processing can be achieved.
- another object of the present invention is to provide a radius end mill capable of maintaining good chip dischargeability.
- the present invention provides a tool body rotated around an axis.
- a radius end mill in which a bottom edge and a substantially arc-shaped corner edge are formed, one ⁇ curve in which the inner edge of the rake face of the bottom edge and the inner edge of the rake face of the corner edge are smoothly continuous. It is characterized by being formed as.
- the inner edge of the rake face of the bottom blade and the inner edge of the rake face of the corner blade are formed as one smoothly continuous curved line. Since there are no corners where the inner edges intersect each other, the gap between the bottom and corner blades and the inner edges of these rake faces can be increased by the absence of these corners. It is possible to secure a large space for discharging chips, and it is possible to maintain good chip dischargeability.
- the inner edges of the rake faces of the bottom blade and the corner blade are formed as one continuous convex curve, when the generated chips are discharged, the chips are trapped. Since chip generation is less likely to occur, smooth chip discharge can be performed, and this also leads to maintenance of good chip discharge performance.
- the rake face of the bottom blade and the rake face of the corner blade are formed as one smoothly continuous curved surface.
- the rake faces of the bottom blade and the corner blade are continuous without any step.
- the generated chips smoothly pass over these rake faces, thereby further improving the chip discharge performance.
- the ratio r / D of the radius of curvature r of the substantially circular arc formed by the corner blade and the diameter D of the tool body is set to 0.2 or more,
- the radius of curvature r of the substantially circular arc formed by the edge is set to (D-d) Z 2 or more with respect to the diameter D and the center thickness d of the tool body, that is, the corner edge becomes large. Therefore, a great effect can be expected in the case where the distance between the corner blade and the bottom blade and the inner edge of the rake face must be reduced.
- FIG. 1 is a plan view of a tip portion of a tool body 11 showing a first embodiment of the present invention
- FIG. 2 is a side view of the embodiment shown in FIG. 1
- FIG. FIG. 4 is a sectional front view taken along the line ZZ in FIG.
- FIG. 5 is a plan view of the tip of the tool body 11 showing the second embodiment of the present invention
- FIG. 6 is a side view of the embodiment shown in FIG. 5
- FIG. 7 is the tip of the embodiment shown in FIG. 8 is a sectional view taken along the line ZZ in FIG.
- FIG. 9 shows a third embodiment of the present invention, and is a view corresponding to the ZZ cross-sectional view in FIG.
- FIG. 10 is a plan view showing a fourth embodiment of the present invention.
- FIG. 11 is a cross-sectional view (a YY cross-sectional view in FIG. 12) of a tip end portion of the tool body 11 of the embodiment shown in FIG. 12 is a front view of the embodiment shown in FIG. 10 when viewed from the front in the direction of the axis ⁇ .
- FIGS. 13 to 15 show the throwaway tips 33 attached to the embodiment shown in FIG. 10, wherein FIG. 13 is a plan view, FIG. 14 is a side view, and FIG. 15 is a front view.
- FIG. FIGS. 16 and 17 show the clamping mechanism 34 of the embodiment shown in FIGS. 10 and 25, and FIG. 16 shows FIGS. 10 and 12, FIGS. FIG. 17 is a ZZ sectional view of FIG. 16, and FIG. 17 is a ZZ sectional view of FIG. 16 (however, the throw-away tip 33 and the clamp screw 42 are not shown).
- FIG. 18 is a plan view of a radius end mill according to a fifth embodiment of the present invention
- FIG. 19 is a side view of a radius end mill according to a fifth embodiment of the present invention
- FIG. 20 is a fifth embodiment of the present invention.
- FIG. 21 is a sectional view of a tool body 50 of a radius end mill according to a fifth embodiment of the present invention.
- FIG. 22 is a plan view of a radius end mill according to a sixth embodiment of the present invention
- FIG. 23 is a side view of a radius end mill according to a sixth embodiment of the present invention
- FIG. 24 is a sixth embodiment of the present invention.
- 1 is a front view of a radius end mill according to the present invention.
- FIG. 25 is a plan view showing a seventh embodiment of the present invention
- FIG. 26 is a cross-sectional view (a YY cross-sectional view in FIG. 27) of the tip of the tool body 11 of the embodiment shown in FIG. 27 is a front view of the embodiment shown in FIG.
- FIGS. 28 to 30 show the throwaway tips 60 attached to the embodiment shown in FIG. 25, wherein FIG. 28 is a plan view, FIG. 29 is a side view, and FIG. 30 is a front view.
- FIG. 28 is a plan view
- FIG. 29 is a side view
- FIG. 30 is a front view.
- FIG. 31 is a plan view of the conventional radius end mill
- FIG. 32 is an enlarged view of a main part of the conventional radius end mill shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 9 shows a first to a fourth embodiment of the present invention relating to a radius end mill having a corner edge extending from the tip to the outer periphery of the radius end mill.
- the tool body 11 is formed of a hard material such as a cemented carbide in a substantially columnar shape centered on the axis ⁇ .
- the tool body 11 is formed so as to be rotationally symmetric with respect to the axis O.
- a pair of chip discharge grooves 12 are formed on the outer circumference of the tip (the left end in FIGS. 1 and 2) of the tool body 11, and when the tool is turned around the axis O from the tip toward the rear end. It is formed so as to be spirally twisted at a constant twist angle at the rear side in the tool rotation direction T.
- the wall surface 13 facing the tool rotation direction T side of the chip discharge groove 12 is formed in a concave curved surface recessed rearward in the tool rotation direction T in a cross section orthogonal to the axis ⁇ .
- An outer peripheral blade 14 is formed at the portion, and a bottom blade 15 is formed at the distal end side. Further, at a corner portion of the outer peripheral end of the wall surface 13 where the outer peripheral blade 14 and the bottom blade 15 intersect, a substantially arc-shaped corner blade 16 protruding toward the outer peripheral side of the front end is provided.
- the outer blade 14 and the bottom blade 15 are formed so as to be continuous.
- two-stage gears are formed on the inner and outer circumferences.
- a main gear face 17 is formed on the inner peripheral side of the front end of the wall surface 13, and the bottom blade 15 is formed at a front edge of the main mesh face 17.
- This main gushing surface 17 is formed such that the inner peripheral side of the tip of the wall surface 13 is substantially parallel to the axis O.
- the main gear surface 17 has an inclination angle of about 0 ° with respect to the axis ⁇ , and is smaller than the twist angle of the chip discharge groove 12. Is done.
- the bottom blade 15 is formed so as to extend linearly from the inner circumference to the outer circumference of the tool body 11 when viewed in the direction of the axis 0 as shown in FIG. ° rake angle in the axial direction.
- the bottom blade 15 is slightly inclined so as to approach the outer peripheral side as shown in FIG. This gives the bottom blade 15 a watermark angle.
- the sub-gear surface 18 is formed inside the corner portion by the second-stage mesh so as to be adjacent to the outer peripheral side of the main mesh surface 17.
- the corner blade 16 is formed on the side ridge on the outer peripheral side of the front end of the auxiliary gear surface 18.
- the sub-gash surface 18 is formed so that the outer peripheral side of the front end portion of the wall surface 13 is cut out in a plane in the same manner as the main gash surface 17.
- the inclination angle / 3 of the sub-gash surface 18 with respect to the axis O is set to be more regular than the main gear surface 17 where the inclination angle with respect to the axis O is 0 °.
- the sub-gash surface 18 is formed so as to retreat with respect to the main-gash surface 17, the sub-gash surface 18 is adjacent to the main-gash surface 17 via the step 19. It becomes.
- the step 19 is formed as a flat wall surface perpendicular to the main gear surface 17 as shown in FIG. 4 in a cross section orthogonal to the axis O, and the sub gear surface 18 As shown in FIG. 1, the bottom blade 15 and the corner blade 16 intersect with the bottom blade 15 and the corner blade 16 at the intersection P, and are substantially perpendicular to the bottom blade 15 provided with the above-mentioned watermark angle. It is made to extend.
- the above-mentioned auxiliary gear surface 18 has an inclination angle / 3 with respect to its axis O, It is configured to be smaller than the twist angle ⁇ of the discharge groove 12 with respect to the axis O. Accordingly, as shown in FIG. 1, the rear end of the sub-gash surface 18 extends beyond the outer edge of the intersection ridge L between the main mesh surface 17 and the wall 13 to the rear end side. 3 and the outer peripheral end of the intersection ridge line ⁇ is the intersection Q between the outer peripheral edge 14 and the corner edge 16.
- the sub-gearsh surface 18 is small, such a configuration may not be adopted.
- these intersecting ridge lines L and ⁇ have a convex curved line that is convex toward the distal end side as shown in FIG. Formed.
- the corner blade 16 is made to smoothly contact the straight bottom blade 15 at the intersection ⁇ , while the convex formed by the corner blade 16 from the intersection ⁇ is formed. As it goes to the outer peripheral side of the rear end along the arc, it inclines to the rear side in the rotation direction ⁇ according to the inclination angle iS of the sub-gearshear surface 18 and intersects the outer peripheral blade 14 at the intersection Q. Have been allowed.
- the axis O is set rather than the twist angle of the chip discharge groove 12.
- the main mesh surface 17 having a small inclination angle (0 °) is formed, and the bottom blade 15 is formed at the tip of the main mesh surface 17.
- the tip angle of the bottom edge 15 can be increased.
- sufficient strength of the cutting edge can be ensured. It is possible to extend the tool life by preventing the occurrence of such problems.
- the jig rotates toward the rear end at a larger inclination angle 3 with respect to the axis O than the main mesh surface 17.
- An inclined sub-gear surface 18 that is inclined rearward in the direction T is formed, and a substantially convex arc-shaped corner blade 16 that continues to the outer peripheral side of the bottom blade 15 is formed at the outer peripheral end of the sub-gash surface 18. Since the corner blades 16 are formed on the side ridges, sharp edges can be given to the corner blades 16 and cutting resistance can be reduced. Therefore, especially It is possible to improve the cutting efficiency in cutting a slope or a curved surface of a mold that frequently uses the knives 16.
- the inclination angle i3 of the sub-gash surface 18 is larger than the main-gash surface 17 but smaller than the torsion angle ⁇ of the chip discharge groove 12.
- the corner blade 16 can have a large tip angle, and the chipping of the corner blade 16 can be secured. Defects can also be prevented.
- the sub-gash surface 18 having a different inclination angle j6 with respect to the axis ⁇ from the main gear surface 17 is formed at the intersection P by the bottom blade 15 and the corner blade 16 formed on the front end sides of each other.
- the sub-gash surface 18 is located between the main-gash surface 17 and the sub-gash surface 18 with respect to the main-gash surface 17.
- the above-mentioned stepped portion 19 having the shape of an upright wall rising above the sub-gearsh surface 18 is formed.
- the stepped portion 19 is formed so as to extend substantially perpendicularly to the bottom blade 15 from the intersection P, that is, to face the outer peripheral side of the tool body 11, so that the slope of the mold is formed. Chips generated at the corner blade 16 especially from the tip of the corner portion to the outer peripheral side during cutting of a curved surface or the like flow out on the sub-gearsh surface 18 to the stepped portion 19. They will be collided.
- the chips may be curled or cut due to the resistance by colliding with the stepped portion 19, so that the radius end mill having the above configuration is processed. According to this, it is possible to improve the disposability of such chips, and together with the reduction of the cutting resistance due to the corner blade 16, it is possible to promote smoother cutting of a mold or the like. It becomes possible. .
- the step 19 is perpendicular to the main gear surface 17 and perpendicular to the auxiliary gear surface 18 in a cross section orthogonal to the axis O. Therefore, a greater resistance can be given to the chips that collided with the stepped portion 19, and it is possible to reliably treat the chips.
- the auxiliary gear surface 1 of the stepped portion 19 having the vertical wall shape as described above can be obtained. If the angle with respect to 8 is steep, the chips that flowed out on the auxiliary gear surface 18 depending on the cutting conditions, etc. When colliding with part 19, it not only receives resistance but also blocks the outflow itself, causing clogging, which hinders smooth chip discharge and rather impairs chip disposability. There is a risk.
- the stepped portion 20 is moved from the main gear surface 17 side to the auxiliary gear surface 18 side. It is desirable to make the slope gradually recede as going toward.
- the same reference numerals are given to the same parts as those in the first embodiment shown in FIGS. 1 to 4, and description thereof will be omitted.
- the stepped portion 20 in the second embodiment extends from the intersection P of the bottom blade 15 and the corner blade 16 as shown in FIG. Although it is configured to extend in a direction substantially perpendicular to the blade 15, it is not perpendicular to the main and sub-gear surfaces 17 and 18 as in the first embodiment, and FIG.
- a flat inclined surface receding from the main gear surface 17 at a constant inclination angle from the main gear surface 17 to the sub-gash surface 18 is formed.
- the inclination angle of the inclined surface formed by the stepped portion 20 fixed in this manner is, as shown in FIG. 8, a direction perpendicular to the sub-gear surface 18 in a cross section orthogonal to the axis O.
- the inclination angle is set in the range of 30 to 60 °.
- the inclined surface gradually retreats from the main gear surface 17 to the auxiliary gear surface 18 as described above. Therefore, the slope of the step portion 20 as viewed from the sub-gearsh surface 18 side is gentler than the step portion 19 of the first embodiment. Therefore, even if chips generated at the corner blade 16 flow out on the auxiliary gear surface 18 and collide with the stepped portion 20, the chips are curled or divided by the resistance by the stepped portion 20. Is also discharged along the slope of the slope formed by the stepped portion 20 and is reliably discharged without clogging.
- the angle of inclination of the inclined surface formed by the stepped portion 20 is in the range of 30 to 60 ° with respect to the direction perpendicular to the auxiliary gear surface 18.
- Sufficient resistance can be given, and smooth processing such as curling and division can be achieved.
- the inclination angle is smaller than 30 ° and becomes smaller than 30 °, and the rising of the step portion 20 is steep and nearly vertical, it may not be possible to sufficiently prevent the clogging of chips, while the inclination angle may be insufficient. If the inclination exceeds 60 °, the resistance given to the colliding chips becomes small, and there is a risk that reliable treatment cannot be achieved.
- the step portion 20 is formed on a flat inclined surface having a constant inclination angle a.
- the inclination angle of the step portion 21 with respect to the direction perpendicular to the sub-gash surface 18 gradually decreases as going from the sub-gash surface 18 side to the main-gash surface 17 side. It may be.
- FIG. 9 is a view corresponding to the ZZ cross section in FIG. 5 of the second embodiment, and the same reference numerals are assigned to portions common to the second embodiment. It is.
- the step portion 21 has an inclined surface shape that gradually retreats from the main gear surface 17 to the auxiliary gear surface 18, the second step The same effect as the embodiment can be obtained.
- the inclination as viewed from the sub-gear surface 18 is gradually increased toward the main-gash surface 17, the chips flowing out on the sub-gash surface 18 are initially at the stepped portion 2. While it will collide with the gentle slope part of 1 and reliably prevent clogging, it will be pushed out as it is guided to the steep slope part on the main gear surface 17 side and gradually increase resistance. By receiving the curl, it will be more efficiently curled, divided and processed. That is, according to the radius end mill of the third embodiment, the excellent chip disposability of the first embodiment and the smooth chip dischargeability of the second embodiment can be both achieved, and the effect is more effective. It is a target.
- FIGS. 10 to 17 illustrate the present invention in which the sub-gash surface 18 is formed on the outer peripheral side of the main-gash surface 17 via the stepped portions 19, 20 and 21 as described above.
- This shows a fourth embodiment when applied to a throw-away type radius end mill.
- the same components as those in the first to third embodiments are denoted by the same reference numerals, and the description is simplified. That is, in the first to third embodiments, a substantially cylindrical tool body 11 made of a hard material such as a cemented carbide is provided with a chip discharge groove 12, main and sub-gearsh faces 17, 18, and a step.
- the tip of the substantially cylindrical holder 31 is formed.
- a tip mounting seat 32 is formed at the end, and a throw-out chip 33 is detachably mounted on the tip mounting seat 32 by a tip clamp mechanism 34 to form a tool body 11.
- the above-mentioned chip discharge groove 12 and the main and sub-gear surfaces 17 and 18, step portions 19, 20 and 21 and outer peripheral edge 14 and bottom edge 15 and corner edge 16 Is formed.
- the holder 31 is made of steel or the like, and the throwaway tip 33 is made of a hard material such as a cemented carbide.
- the tip of the holder 31 is hemispherical, and the tip mounting seat 32 moves the tip of the holder 31 toward the tip along a plane including the axis O of the tool body 11.
- a pair of wall surfaces 35, 36 which are notched so as to be open and extend in one direction perpendicular to the axis O, and which are parallel to the axis ⁇ and also parallel to each other and face each other;
- the bottom surface 37 is perpendicular to the wall surfaces 35 and 36 and is orthogonal to the axis 0 and faces the front end side of the holder 31.
- the throwaway chip 33 is formed in a substantially rectangular flat plate shape that can be fitted into such a groove-shaped chip mounting seat 32, and thus the throwaway chip 33 is fitted in this state.
- a pair of parallel side surfaces 38, 39 closely contacting the wall surfaces 35, 36 and a rear end surface 40 perpendicular to the side surfaces 38, 39 and closely contacting the bottom surface 37 are provided. I have.
- a mounting hole 41 having a circular cross section is formed between the side surfaces 38 and 39, and penetrates substantially the center of the mouth-to-away chip 33 perpendicularly to the side surfaces 38 and 39.
- a chip discharge groove 12 is spirally formed on each of a pair of peripheral surfaces of the throw-away tip 3 3 which is located at the outer peripheral edge of the wall surface 13 facing the tool rotation direction T side.
- the outer edge 14 is formed in the A main gear surface 17 is formed on the inner peripheral side of the end, and a bottom blade 15 is formed on the edge on the tip side, and a step portion 19, 20 is formed on the outer peripheral side of the main gear surface 17.
- a sub-gearsh surface 18 is formed, and a substantially convex arc-shaped corner blade 16 is formed on a side ridge from the tip to the outer periphery.
- the throw-away tip 33 fitted into the tip mounting seat 32 is positioned so that the center line X of the mounting hole 41 is orthogonal to the axis ⁇ of the tool body 11 and the clamping mechanism In a state where the tool main body 11 is formed by being fixed by 34, the tool body 11 is formed in a symmetrical shape with respect to the axis O. Also, of the hemispherical tip of the holder 31, the portion of the pair of chip discharge grooves 12 of the throwaway tip 33 adjacent to the tool rotation direction T side has a radius larger than the radius of the hemisphere.
- the cutout 31A is cut out by the cylindrical surface.
- the outer edge 14, the bottom edge 15, the corner edge 16, the main gear surface 17, the auxiliary gear surface 18, and the stepped portions 19, 20, 21 are formed by the throw-away tip 33.
- the same effect as in the first to third embodiments can also be obtained according to the form of the step portions 19, 20 and 21 in the throw-away type radius-send mill of the fourth embodiment formed as described above. .
- the tip mounting seat 32 in order to clamp the throw-away tip 33 fitted in the tip mounting seat 32, the tip mounting seat 32 is interposed between the tip mounting seat 32 and the wall surface 35. , 36 side, the clamp screw 42 passed through from one side (wall 36 side) of the tip end of the holder 31 is passed through the above throw-away tip 33 to the other side (wall side). 3 5), the tip of this holder 3 1 is elastically deformed to pinch the throw-away tip 3 3, and the clamp screw 4 2 itself is naturally deformed and bent in a direction intersecting the screwing direction. As a result, the throw-away chip 33 is pressed in the bending direction to be clamped.
- the clamp screw 42 has a male screw portion 42A at one end and a countersunk head 42B having a conical back surface at the other end.
- the distance between the male screw part 4 2 A and the head 4 2 B is determined by the outer diameter that can be fitted into the mounting hole 4 1 in close contact and the distance between the wall surfaces 3 5 and 3 6 of the chip mounting base 3 2.
- a portion of the tip mounting seat 32 on the wall surface 35 side includes: A screw hole 43 penetrating this portion perpendicularly to the wall surface 35 is formed so as to be coaxial with the center line X of the throwaway tip 33 positioned as described above.
- the portion of the screw hole 43 that opens to the wall surface 35 is a circular hole 43 A having the same inner diameter as the mounting hole 41 of the throw-away tip 33, and the shaft portion 4 of the clamp screw 42.
- the end of the male screw part 4 2 A side of 2 C is tightly fitted and can be fitted, and the part of the clamp screw 4 2 above the circular hole 43 A on the side opposite to the wall surface 35 is A female screw portion 43B into which the male screw portion 42A is screwed is formed.
- the clamp screw 42 is also passed through a part of the tip end of the holder 31 on the wall surface 36 side of the chip mounting seat 32 (the above-described one side).
- a through hole 4 4 is formed perpendicular to the wall surface 36.
- the cross section of the through hole 44, which is parallel to the wall surface 36, is shown in FIG. 17 at any position in the center line X direction of the mouth-to-away tip 33 positioned as described above.
- the hole is formed so as to have an elliptical shape having a long axis extending in a direction parallel to the axis O, that is, in a direction intersecting the direction of the center line X into which the clamp screw 42 is screwed.
- the center of the ellipse of the 12 arc on the tip side (left side in FIG. 17) of the tool body 11 is located on the center line X, and
- the half-arc portion on the side and the 1Z2 arc portion on the rear end are connected in parallel to the long axis and also parallel to each other by a pair of tangent lines at both ends of these 1Z2 arcs .
- the portion of the through hole 44 opening into the wall surface 36 has an inner diameter (diameter) of a half arc of the ellipse formed by the cross section, and a distance between the pair of tangential lines, that is, the length of the ellipse.
- the width W is equal to the inner diameter (diameter) E of the circular hole 4 3 A of the screw hole 4 3 on the opposite wall 3 5 and the inner diameter (diameter) of the mounting hole 41 of the throw-away tip 33.
- the engaging portion 44A has a width such that the shaft portion 42C of the clamp screw 42 can be fitted into at least the pair of tangential portions in close contact therewith.
- a portion of the opposite side of the engagement portion 44 A from the wall surface 36 is an oval formed by the cross section.
- the radius of the half-arc and the distance between the pair of tangents are gradually increased as going toward the side opposite to the wall surface 36.
- the inclined portion 44B is inclined, and the inclined angle of the inclined portion 44B is It is equal to the taper angle of the conical surface formed by the head 4 2 B of the clamp screw 42.
- the opening 3 4C which is open to the outer periphery of the tip of the holder 3 1 on the opposite side to the wall surface 36 from the inclined portion 4 4 B, has an oval 1 Z formed by the cross section of the through hole 4 4.
- the inner diameter (diameter) of the two arcs and the interval between the tangents are set to be larger than the diameter of the head 42B.
- the width of the recessed portion from the bottom surface 37 to the rear end side of the tool body 11 is small to facilitate elastic deformation of the tip of the holder 31.
- the slit 45 is formed so as to extend in parallel with the wall surface 36.
- the throw-away chips 33 are fitted into the chip mounting seat 32 such that the center line X of the mounting hole 41 is orthogonal to the axis O as described above, so that they are mutually the same.
- Inside diameter (diameter) The cross section of the tool body 1 1 at the tip end side of the mounting hole 4 1 and the circular hole 4 3 A of the screw hole 4 3 and the engaging portion 4 4 A of the through hole 4 4 .
- the 1 Z 2 arc portion is located on the inner surface of the same cylinder centered on the center line X. Therefore, the clamp screw 42 passed through the opening 44 of the through hole 44 and the C side is passed through the mounting hole 41, and the male screw portion 42A is screwed into the female screw portion 43 of the screw hole 43.
- the cylindrical shaft portion 42C of the clamp screw 42 is fitted so as to be in close contact with the inner surface of the cylinder, and the throw-away tip 33 is positioned.
- the conical surface on the back side of the head 4 2B becomes a cross section on the tip side of the tool body 1 1 of the inclined portion 4 4 B of the through hole 44.
- the tip of the holder 31 on the wall surface 36 on which the through hole 44 is formed is slightly elastically deformed to the wall surface 35 side, and these both wall surfaces 35, 3
- the side walls 38, 39 are pressed by 6 so that the slotted chip 33 is sandwiched and fixed in the chip mounting seat 32.
- the clamp screw 42 is driven by the reaction force of the above-mentioned conical surface on the back surface of the head 4 2 B pressing the tip side of the inclined portion 44 B of the through hole 44.
- the portion extending from the shaft portion 42C to the shaft portion 42C is slightly elastically deformed so as to bend toward the rear end side of the tool body 11 along the long axis of the oval formed by the cross section of the through hole 44. Accordingly, the inner peripheral surface of the mounting hole 41 into which the shaft portion 42C is fitted is also pressed in the bending direction of the clamp screw 42.
- the tool body 11 also receives a pressing force on the rear end side so that the rear end face 40 is pressed against the bottom face 37 of the chip mounting seat 32, and is fixed more firmly.
- the radius-send mill described in the above-mentioned Japanese Patent Application Laid-Open No. 59-17559 is to be throw-away, a groove-shaped chip formed in a holder in the same manner as in the present embodiment.
- the cutting edge is formed on the throw-away tip fitted into the mounting seat, and the tip end of the holder and the clamp screw are elastically deformed by a clamp mechanism provided with a clamp screw inserted through the mounting hole of the throw-away tip.
- the slot tip is fixed by being pressed against the tip mounting seat bottom surface by bending of the clamp screw in the axial direction of the tool body.
- Both wall surfaces of the chip mounting seat also sandwich the throw-away chip in the direction of the center line of the mounting hole of the above-mentioned slideway chip, which is perpendicular to the axis. It is fixed by pressing Nde.
- the throwaway tip is It is only supported by the shaft of the clamp screw inserted into the mounting hole.
- the through hole at the tip of the holder into which the elastically deformable portion of the shaft is inserted must be larger than the outer diameter of this shaft. For example, simply making the through hole at the end of the holder larger than the outside diameter of the shaft section only requires positioning the throwaway tip and then fixing it by screwing in the clamp screw or cutting. When a load is applied during machining, the clamp screw also bends in the direction in which the tip mounting seat extends, causing the throwaway tip to shift and move, resulting in a significant loss of machining accuracy. May be affected.
- the through hole 44 on the wall surface 36 side of the holder 31 through which the clamp screw 42 is inserted has an oval cross section, and the insertion hole 4
- an engaging portion 4 4 A having a width W capable of fitting the shaft portion 4 2 C of the clamp screw 4 2 in 4, the bending in the direction of the axis 2 due to the elastic deformation of the clamp screw 42.
- the shaft portion 42C is engaged with the engaging portion 44A in this direction to restrain the shaft portion 42C.
- the clamp mechanism 34 is provided with a concave groove formed at the tip of the holder 31.
- the lower insert 33 fitted in the tip mount seat 32 is inserted through the holder 31 with the tip mount 32 interposed from one side of the tip end, and the lower insert 33 is inserted. Screwing the clamp screw 42 into the other side of the tip of the holder 31 so as to pinch it on both sides of the holder 31 and to insert the clamp screw 42 in the direction crossing the screwing direction.
- a clamp mechanism 34 of a throw-away tip 33 which presses and clamps in the direction of bending by bending the clamp.
- the clamp mechanism 34 is formed on one side of the tip of the holder 31.
- the shaft portion 4 2 C of the clamp screw 42 is fitted into the insertion hole 44 into which the screw 42 is inserted, with the clamp screw 42 screwed into the other end of the holder 31.
- the clamp mechanism 3 4 is 3 4.
- the clamp screw 4 2 does not bend in any direction other than the above bending direction in the direction intersecting with the screwing direction of 4 2, and it is possible to prevent the throw-away chip 3 3 from shifting when the crumb screw 4 2 is screwed or processed. it can. For this reason, it is possible to carry out the cutting while holding the thrower tip 33 so as to be exactly symmetrical with respect to the axis ⁇ of the tool body 11, and it is possible to obtain high machining accuracy. Further, in this embodiment, a circular hole in which the end of the shaft portion 4 2C can be fitted into a screw hole 43 formed on the other side of the tip of the holder 31 and into which the clamp screw 42 is screwed.
- the shaft portion 4 2 C is formed around the end without applying a load due to bending to the male screw portion 42 A of the clamp screw 42 formed on this end side. Can be bent to prevent damage to the clamp screw 42.
- the inner diameter (diameter) E of the circular hole 43A is made equal to the width "W" of the engaging portion 44A, and the circular hole 43A is fitted to the engaging portion 44A. Since the above-mentioned shaft portion 42C of the clamp screw 42 to be inserted is also formed in a cylindrical shape having a constant outer diameter, the burden caused by bending is reduced also in this shaft portion 42C, and the shaft portion 42C is also formed. Can be uniformly bent, and the damage can be prevented.
- the engaging portion 44A has an oval cross section, and the tool body 11 has a tip end side, that is, a side opposite to the bending direction, having an inner diameter (diameter) E equal to the circular hole 43A. It is a 1/2 arc and is positioned on the same cylindrical surface as the circular hole 43A as described above. For this reason, when forming such a circular hole 43A and the engaging portion 44A, first, the cylindrical surface portion of the inner diameter E is drilled with a drill or the like, and the circular hole 43A and the engaging portion are formed.
- the above-mentioned 1/2 arc portion of 44 A is formed, and then the inner diameter (diameter) E of this cylindrical surface, that is, the engaging portion 44 A with the above-mentioned width W of the engaging portion 44 A is bent in the above bending direction.
- Cutting may be performed by an end mill or the like so as to spread to the side, and the advantage that processing for accurately forming the circular hole 43A and the engaging portion 44A can be easily obtained.
- FIGS. 18 to 30 show a fifth end of the present invention relating to a radius end mill in which the inner edge of the rake face of the bottom edge and the inner edge of the rake face of the corner edge are formed as one smoothly curved continuous curve.
- FIG. 19 shows an eighth embodiment to an eighth embodiment.
- the radius end mill according to the fifth embodiment is shown in FIGS.
- it has a substantially cylindrical tool body 50 made of a hard material such as a cemented carbide and rotated around the axis ⁇ .
- the tool body 50 is also formed so as to be symmetrical with respect to the axis O.
- two chip discharge grooves 51 are formed at substantially equal intervals in the circumferential direction so as to open to the outer peripheral surface of the tool body 50, and these two chip discharge grooves are formed.
- the groove 51 is formed so as to be helically twisted about the axis O at a predetermined twist angle 0 toward the rear side in the tool rotation direction T toward the rear end side in the axis O direction.
- two gears 52 are formed at equal intervals in the circumferential direction so as to open at the tip face of the tool body 50 and divide the tip face into a plurality. These two gears 52, like the chip discharge groove 51, are formed so as to be twisted in the tool rotation direction T rearward toward the rear end side in the axis O direction.
- the gear 52 has a rear end portion continuous with the tip end portion of the chip discharge groove 51, so that the gear 52 and the chip discharge groove 51 communicate with each other.
- the wall surface of the chip discharge groove 51 formed on the outer periphery of the tool body 50 facing the tool rotation direction T front side is formed as an outer rake face 51 A, and the outer rake face 51 A of the outer rake face is provided.
- the outer rake face 51 A and the outer flank 53 intersecting the outer rake face 51 A and facing the outer peripheral side of the tool body 5 3 4 are formed.
- the tool rotation direction of the gear 52 T The rear end of the wall facing the front in the direction of the axis ⁇ extends in the tool rotation direction of the chip discharge groove 51.
- the outer rake face 51 which is the wall facing the front, extends to the tip of the cutting edge 51A. Then, they are continuous with each other.
- the outer peripheral blade distal end portion 54 is connected to the rear end side portion of the wall surface of the gear 52 facing the tool rotation direction T front side in the axis ⁇ direction by the outer peripheral distal end portion.
- the rake face 52C the outer peripheral edge of the outer peripheral tip rake face 52C, In other words, it is formed at the intersection ridge line between the outer peripheral tip rake face 52C and the outer peripheral flank 53 facing the outer peripheral side of the tool body 50.
- the inner peripheral side of the tool body 50 is formed as a tip rake face 52 A at a tip side portion in the direction of the axis O on a wall surface of the gearsh 52 facing the tool rotation direction T front side, and the tool body is formed. 50
- the outer peripheral portion is a corner rake surface 52B.
- the ridge portion located on the tip side of the tip rake face 52A that is, the tip rake face 52A and the tip flank face 5A crossing the tip rake face 52A and facing the tip side in the axis ⁇ direction.
- the bottom edge 56 extending from the vicinity of the axis ⁇ to the outer periphery of the tool body 50 is formed at the intersection ridge line portion with the bottom edge 5.
- the bottom blade 56 has a slight inclination from the vicinity of the axis ⁇ to the outer peripheral side of the tool body 50 toward the tip side in the direction of the axis O.
- the ridge line portion located on the outer peripheral side of the tip of the corner rake face 52B, that is, the tool main body 50 outer peripheral side and the axis O direction intersecting the corner rake face 52B and the corner rake face 52B.
- a substantially 1/4 arc-shaped corner blade 58 is formed at the intersection ridge line with the corner flank 57 facing the front end side of the shaft.
- the radius of curvature r of the substantially circular arc formed by the corner blade 58 is the diameter D of the tool body 50 (the diameter of the circle S 1 circumscribing a cross section orthogonal to the axis O of the tool body 50 shown in FIG. 21).
- the ratio r ZD of the tool body 50 is set to be 0.2 or more, and the diameter D and the core thickness d of the tool body 50 (inscribed in a cross section orthogonal to the axis O of the tool body 50 shown in FIG. 21). (Diameter of the circle S2) and (D-d) / 2 or more.
- the bottom blade 56 smoothly continues to the outer peripheral blade 54 via a substantially quarter-arc-shaped corner blade 58.
- the approximately 1/4 arc-shaped corner blade 58 forms an intersection (corner portion) formed by the bottom blade 56 and the outer blade 54 intersecting each other.
- the radius end mill is a two-flute radius end mill having two cutting edges smoothly connected from the bottom edge 56 to the outer peripheral edge 54 via the corner edge 58.
- the bottom edge 56 and the corner edge 58 have a gentle convex that projects forward in the tool rotation direction T when viewed from the tip side in the direction of the axis O. It has a curved shape, and the corner blade 58 and the outer peripheral blade 54 are formed by twisting the chip discharge groove 51 and the gear 52 as described above, so that the rear end side in the direction of the axis ⁇ . It is formed so that it is twisted toward the tool rotation direction T rearward as it moves toward.
- the gear O faces the wall surface (the front rake face 52A, the corner rake face 52B, and the outer circumference front rake face 52C) facing the tool rotation direction T front side of the gear 52 and the axis O.
- the tool body 50 is viewed from a direction perpendicular to the inner surface of the tip rake face 52A (see Fig. 18) (from the tip rake face 52A and the tip rake face 52A), as shown in Fig.
- the tip rake face 52A, the corner rake face 52B, and the outer peripheral tip rake face 52C which are the wall faces toward the front side in the tool rotation direction T of the gear 52, are also smoothly continuous with each other. It is formed as one curved surface.
- the rake angle in the axial direction of the rake face (the top rake face 52 A, the corner rake face 52 B, and the outer circumference tip rake face 52 C) composed of this single curved surface (axis ⁇ direction and rake face) Angle, the inclination of the tool in the tool rotation direction T toward the rear end in the direction of the axis ⁇ is defined as positive.)
- the axial rake angle ⁇ 5 near the bottom blade 56 is 0 ° ⁇ ⁇ ⁇ 20 ° and the axial rake angle ⁇ around the tip of the outer peripheral blade 54 ° ⁇ , the axial rake angle near the bottom blade 56 ⁇ and the torsion angle of the chip discharge groove 51 In relation to 0, it is set so that ⁇ and 0 ° ⁇ ( ⁇ - ⁇ ) ⁇ 10 °.
- the tip end The inner edge 59A of the rake face 52A, the inner edge 59C of the corner rake face 52B, and the inner edge 59C of the outer rake end edge rake face 52C are one convexity that is smoothly continuous with each other. Because it is formed as a curve, the rake face (the top rake face 52 A, the corner rake face 52 B, and the outer circumference tip rake face 52 C) has a conventional rake face. There will be no corners where the inner edges cross.
- the bottom edge 56, the corner edge 58, the outer edge tip 54A, and the inner edges 59A, 59B, 59C of these rake faces The interval can be increased.
- the chip discharge at the time of cutting the workpiece is achieved.
- Property can be maintained favorably.
- the inner edge 59A, 59B, 59C of the rake face (the top rake face 52A, the corner rake face 52B, and the outer circumference front rake face 52C) has one convex curve that is continuous with each other.
- the tip rake face 52A, the corner rake face 52B, and the outer edge tip rake face 52C are formed as one curved surface that smoothly continues to each other without any step. Since it is formed so as to be continuous, chips generated by cutting the workpiece can smoothly pass over these rake faces 52 A, 52 B, 52 C, so that further chip discharge Improvement can be achieved.
- the rake faces 52A, 52B, 52C are formed as one continuous curved surface having no step, it is possible to improve the processing accuracy of the corner portion and to reduce the time required for manufacturing. It is also possible to shorten it.
- the ratio r / D of the radius of curvature r of the substantially circular arc formed by the corner blade 58 to the diameter D of the tool body 50 is 0.2 or more, and The radius of curvature r of the substantially circular arc formed by the corner blade 58 is (D-d) no more than 2 with respect to the diameter D and the core thickness d of the tool body 50, and the substantially circular corner blade 5 is formed.
- the corner blade 5 8, the bottom blade 5 6, and the outer edge 5 The gap between 4A and the inner edges of these rake faces 59A, 59B, 59C tends to be large, and a sufficiently large gear 52 cannot be formed, resulting in poor chip discharge.
- the effect obtained by the inner edges 59A, 59B, and 59C being one continuous convex curve and the rake faces 52A, 52B, 52C are continuous.
- the effect obtained by having one curved surface solves the problem of chip discharge.
- the book is formed such that the rake face 52 A of the bottom blade 5 6 and the inner edge 59 A of the corner blade 58 are formed as one smoothly curved continuous convex curve.
- the invention is described in the case where the ratio r / D of the radius of curvature r of the substantially circular arc formed by the corner blade 58 to the diameter D of the tool body 50 is set to 0.2 or more, or when the corner blade 58 is used. Greater effect is achieved when the radius of curvature r of the substantially circular arc formed is set to (D_d) / 2 or more with respect to the diameter D and the core thickness d of the tool body 50. However, if a particularly remarkable effect is expected, the present invention is applied to a radius end mill in which the ratio r ZD is set to 0.3 or more and the radius of curvature r is set to (D-d) Z 2 or more. do it.
- the chip discharge groove is not formed on the outer periphery of the tool body 50, and the rear end side portion of the gear 52 formed at the tip of the tool body 50 is formed by the tool body The outer periphery of 50 is cut off.
- the rear end portion of the wall surface of the gear 52 facing the tool rotation direction T facing forward in the direction of the axis O is defined as an outer circumferential rake face 52C, and a ridge portion (outer circumferential rake face 52) located on the outer circumferential side is formed.
- An outer peripheral edge 54 is formed at the intersection ridge line between C and the outer peripheral flank 53.
- the inner peripheral side of the tool body 50 is defined as a rake face 52 A on the front end side in the direction of the axis 0 on the wall surface facing the front side of the tool 52 in the tool rotation direction T, and is located at the front end side.
- the bottom edge 56 is formed on the ridge line portion
- the outer peripheral portion of the tool body 50 is a corner rake face 52B
- the ridge line portion located on the outer peripheral side of the tip has an approximately 1 Z 4 arc-shaped corner blade. 5 8 are formed.
- the approximately 1Z4 arc-shaped corner blade 58 forms an intersection (corner portion) formed by the bottom blade 56 and the outer peripheral blade 54 intersecting each other.
- the ratio r ZD between the radius of curvature r of the substantially circular arc formed by the corner blades 58 and the diameter D of the tool body 50 is set to be 0.3 or more.
- the inner edge 59A of the tip rake face 52A, the inner edge 59B of the corner rake face 52B, and the inner edge 59C of the outer rake face 52C ( The outer rake face 52C and the boundary line between the outer rake face 52C and the wall 52D of the gear 52 rising in the tool rotation direction T forward from the outer rake face 52C form a single convex curve that is continuous with each other.
- the front rake face 52 A, the corner rake face 52 B, and the outer peripheral rake face 52 C are formed as one continuous curved face, which is the same as in the fifth embodiment described above. The effect can be obtained.
- the ratio r ZD between the radius of curvature r of the substantially circular arc formed by the corner blade 58 and the diameter D of the tool body 50 is set to at least 0.3, and Since the arc-shaped corner blade 58 is formed very large, in such a case, if the inner edge intersects at an obtuse angle to form a corner as in a conventional radisend mill, The gap between the corner blade 58, the bottom blade 56, the outer peripheral blade 54, and the inner edges 59A, 59B, 59C of these rake faces must be very small, and the gear If the space of 52 becomes small, it tends to fall into a situation in which the chip discharge performance is extremely deteriorated, but in such a case, by applying the present invention, it is possible to reduce 5 9 C must be one continuous convex curve, and the rake faces 52 A, 52 B and 52 C must be one continuous curved surface.
- FIG. 19 shows a seventh embodiment in which the radius end mill of the present invention formed as one convex curve is a throw-away type similarly to the fourth embodiment, and particularly the sixth embodiment. Similar to the embodiment, the case where the ratio r ZD between the radius of curvature r of the substantially circular arc formed by the corner blade 58 and the diameter D of the tool body 50 is set to 0.3 or more is shown. That is, also in the seventh embodiment, a substantially cylindrical shape formed of a steel material or the like is used.
- a concave groove-shaped chip mounting seat 32 is formed at the tip of the holder 31, and the flat-shaped throwaway chip 60 made of a hard material such as a cemented carbide is fitted into the chip mounting seat 32.
- the tool body 50 is constituted by being detachably attached by the tip clamp mechanism 34.
- a bottom blade 56 and a substantially arc-shaped corner blade 58 are formed on the throwaway tip 60 of the tool body 50 configured as described above, and the rake face 52 of the bottom blade 56 is formed.
- the inner edge 5 9 A of A and the rake face 5 2 B of the corner blade 5 8 are formed as one smoothly continuous convex curve, and the rake face 5 2 A of the bottom edge 5 6
- the rake face 52B of the corner blade 58 is formed as one smoothly continuous curved surface.
- the same components as those in the other fifth and sixth embodiments are denoted by the same reference numerals, and description thereof is omitted.
- the same reference numerals are assigned to elements common to the throwaway tip 33 and the clamp mechanism 34 of the fourth embodiment.
- the clamp mechanism 34 is omitted from the drawings by diverting FIGS. 16 and 17.
- the outer peripheral blade 54 has substantially the same configuration as that of the fifth embodiment, that is, the outer peripheral blade 54 is formed in the gear 52 at the tip end side of the outer peripheral blade 54.
- the outer edge tip 54 A rake face (outer edge tip rake face) 52 C is smoothly connected to the bottom edge 56 and the corner edge 58 rake faces 52 A, 52 B A curved surface, and the inner edge 59 C of the outer peripheral tip rake face 52 C is a single convex curve smoothly connected to the inner faces 59 A, 59 B of the rake faces 52 A, 52 B. It is formed as a line.
- the throw-away tip 60 is also formed in a symmetrical shape with respect to the axis ⁇ in a state where the tool body 50 is formed, and the outer diameter D of the tool body 50 in this embodiment is The tool body 50 with the main body 50 configured.
- the diameter of the circle circumscribing the cross section perpendicular to the axis ⁇ of the tip is the throw-away tip 60.
- 58 is the maximum diameter of the rotation locus around the axis ⁇ . Therefore, even with the throw-away type radius end mill of the seventh embodiment, the same effects as those of the fifth and sixth embodiments can be obtained.
- the clamp mechanism 34 in the seventh embodiment is also provided with a tip end portion of the holder 31 for the purpose of preventing the processing accuracy from being degraded due to the displacement of the throw-away tip 60 as in the above-described fourth embodiment.
- the insertable insert 60 fitted into the grooved chip mounting seat 32 formed in the above is inserted from one side of the tip of the holder 31 with the chip mounting seat 32 therebetween, and By screwing the clamp screw 42 through the throw-away tip 60 into the other side of the tip of the holder 31, the clamp screw 42 is sandwiched on both sides of the tip of the holder 31 and the clamp screw 42 is inserted.
- a clamp mechanism 34 of a throw-away tip 60 that clamps by pressing in the direction of deflection by bending in a direction intersecting the screwing direction.
- the clamp screw 42 is inserted into the insertion hole 44 into which the clamp screw 42 is inserted.
- a long hole-shaped engaging portion 44 having a width in which 42 C can be fitted and extending in the bending direction 44 A is formed.
- a circular hole 4 3 A into which the end of the shaft portion 4 2C can be fitted into a screw hole 4 3 formed on the other side of the holder 3 at the tip of the holder and into which the clamp screw 4 2 is screwed.
- the inner diameter (diameter) E of the circular hole 43A is made equal to the width W of the engaging portion 44A, and the circular hole 43A and the engaging portion 4A are formed.
- the shaft portion 4 2C of the clamp screw 4 2 to be fitted into the clamp portion 4 A is formed in a cylindrical shape having a constant outer diameter, and the engaging portion 44 A has an oval cross section.
- the opposite side of the bending direction is a 1Z2 arc having an inner diameter (diameter) E equal to the above-mentioned circular hole 43A, and is positioned on the same cylindrical surface as the circular hole 43A. This is also the same as the clamp mechanism 34 in the fourth embodiment.
- the seventh embodiment similarly to the fourth embodiment, it is possible to prevent the throw-away tip 60 from being displaced during screwing or machining of the clamp screw 42 and to achieve high machining accuracy. And the damage of the clamp screw 42 can be prevented, and the circular hole 43A and the engaging portion 44A can be formed accurately and easily. The effect that it can be obtained is obtained.
- clamping mechanism 34 of the throw-away insert 60 itself can be applied to various throw-away type cutting tools other than the radius end mill, including the pole end mill and the square end mill. This is the same as the embodiment. Further, as described above, the present invention is not limited to each of the first to seventh embodiments, and the components of these embodiments may be appropriately combined.
- the inner edge of the main gear surface 1 ⁇ corresponding to the rake face 52A of the bottom blade 56 of the fifth to seventh embodiments, and the rake face of the corner blade 58 The inner edge positioned inside from the auxiliary gear surface 18 corresponding to 52B through the steps 19, 20 and 21 or in addition to these, the outer edge 5 4 (the outer edge 5 4A) Forming a smoothly continuous convex curve with the inner edge of the wall 13 facing the tool rotation direction T side of the chip discharge groove 1 2 corresponding to the rake face 5 1 A (the outer peripheral tip rake face 5 4 A) May be.
- the rake face 52A of the bottom blade 56 and the rake face 52B of the corner blade 58 in the fifth to seventh embodiments is formed so as to retreat from the rake surface 52 A through the steps 19, 20, 21.
- the corner blade 58 may be formed so as to be continuous with the outer periphery of the bottom blade 56 from the front end to the outer periphery of the bottom blade 56.
- the stepped portions 19, 2 of the first to fourth embodiments are provided.
- the chips having good processability, curled or cut by 0, 21 are formed as one smoothly continuous convex curve of the fifth to seventh embodiments. Since it is discharged well by 59 C, it is possible to further improve the chip disposability.
- the present invention relates to a radius end mill used for cutting a workpiece such as a mold.
- a sub-gash surface having a larger inclination angle with respect to the axis of the tool main body than the inner main-gear surface is formed on the outer peripheral side of the tip of the wall surface of the chip discharge groove facing the tool rotation direction.
- the inner edges of the rake face of the bottom edge and the inner edge of the rake face of the corner edge are formed as one smoothly continuous convex curve. Since there is no corner to be formed, a large space for discharging the generated chips can be secured, and the discharged chips are less likely to be caught, so that it is possible to maintain good chip dischargeability. it can.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Milling Processes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Disintegrating Or Milling (AREA)
- Crushing And Grinding (AREA)
- Medicines Containing Plant Substances (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020107022619A KR101093461B1 (ko) | 2002-12-26 | 2003-12-22 | 레디어스 엔드밀 |
DE60333036T DE60333036D1 (de) | 2002-12-26 | 2003-12-22 | Schaftfräser |
AU2003289488A AU2003289488A1 (en) | 2002-12-26 | 2003-12-22 | Radius end mill |
US10/540,681 US7402004B2 (en) | 2002-12-26 | 2003-12-22 | Radius end mill |
AT03780995T ATE471223T1 (de) | 2002-12-26 | 2003-12-22 | Schaftfräser |
EP20030780995 EP1591183B1 (en) | 2002-12-26 | 2003-12-22 | Radius end mill |
CN2003801074040A CN1732061B (zh) | 2002-12-26 | 2003-12-22 | 半径端铣刀 |
JP2004562890A JP4622520B2 (ja) | 2002-12-26 | 2003-12-22 | ラジアスエンドミル |
US12/136,609 US7927046B2 (en) | 2002-12-26 | 2008-06-10 | Radius end mill |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-375687 | 2002-12-26 | ||
JP2002375688 | 2002-12-26 | ||
JP2002375687 | 2002-12-26 | ||
JP2002-375688 | 2002-12-26 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10540681 A-371-Of-International | 2003-12-22 | ||
US12/136,609 Continuation US7927046B2 (en) | 2002-12-26 | 2008-06-10 | Radius end mill |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004058438A1 true WO2004058438A1 (ja) | 2004-07-15 |
Family
ID=32684240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/016477 WO2004058438A1 (ja) | 2002-12-26 | 2003-12-22 | ラジアスエンドミル |
Country Status (9)
Country | Link |
---|---|
US (2) | US7402004B2 (ja) |
EP (2) | EP1591183B1 (ja) |
JP (2) | JP4622520B2 (ja) |
KR (2) | KR101093461B1 (ja) |
CN (2) | CN100522433C (ja) |
AT (1) | ATE471223T1 (ja) |
AU (1) | AU2003289488A1 (ja) |
DE (1) | DE60333036D1 (ja) |
WO (1) | WO2004058438A1 (ja) |
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JP2008110472A (ja) * | 2006-10-06 | 2008-05-15 | Mitsubishi Materials Corp | ラジアスエンドミル |
WO2009123189A1 (ja) | 2008-03-31 | 2009-10-08 | 三菱マテリアル株式会社 | ラジアスエンドミルおよび切削インサート |
WO2009123192A1 (ja) | 2008-03-31 | 2009-10-08 | 三菱マテリアル株式会社 | ラジアスエンドミルおよび切削インサート |
JPWO2009123189A1 (ja) * | 2008-03-31 | 2011-07-28 | 三菱マテリアル株式会社 | ラジアスエンドミルおよび切削インサート |
US8845241B2 (en) | 2008-03-31 | 2014-09-30 | Mitsubishi Materials Corporation | Radius end mill and cutting insert |
JP5267556B2 (ja) * | 2008-03-31 | 2013-08-21 | 三菱マテリアル株式会社 | ラジアスエンドミルおよび切削インサート |
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CN102802854B (zh) * | 2010-03-29 | 2016-01-20 | 三菱综合材料株式会社 | 立铣刀 |
WO2013099954A1 (ja) | 2011-12-27 | 2013-07-04 | 京セラ株式会社 | ラジアスエンドミル |
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JP2015533666A (ja) * | 2012-11-14 | 2015-11-26 | イスカル リミテッド | ラジアスエンドミル |
JP2017526548A (ja) * | 2014-09-15 | 2017-09-14 | イスカル リミテッド | 凸状径方向逃げ面と円弧プロファイルを有するコーナとを備えるエンドミル |
JPWO2018003684A1 (ja) * | 2016-06-27 | 2019-04-04 | 三菱日立ツール株式会社 | 切削インサート及び刃先交換式回転切削工具 |
US11123810B2 (en) | 2016-06-27 | 2021-09-21 | Moldino Tool Engineering, Ltd. | Cutting insert and indexable rotary cutting tool |
WO2018198445A1 (ja) * | 2017-04-25 | 2018-11-01 | 住友電工ハードメタル株式会社 | 切削インサート |
JPWO2018198445A1 (ja) * | 2017-04-25 | 2020-03-05 | 住友電工ハードメタル株式会社 | 切削インサート |
US10875106B2 (en) | 2017-04-25 | 2020-12-29 | Sumitomo Electric Hardmetal Corp. | Cutting insert |
JP7069487B2 (ja) | 2017-04-25 | 2022-05-18 | 住友電工ハードメタル株式会社 | 切削インサート |
JP2019123067A (ja) * | 2018-01-19 | 2019-07-25 | 三菱マテリアル株式会社 | ラジアスエンドミル |
JP7040039B2 (ja) | 2018-01-19 | 2022-03-23 | 三菱マテリアル株式会社 | ラジアスエンドミル |
Also Published As
Publication number | Publication date |
---|---|
US7402004B2 (en) | 2008-07-22 |
JPWO2004058438A1 (ja) | 2006-04-27 |
KR101093461B1 (ko) | 2011-12-13 |
CN101164726A (zh) | 2008-04-23 |
EP2030713B1 (en) | 2013-05-01 |
KR20100121698A (ko) | 2010-11-18 |
EP1591183A4 (en) | 2008-07-16 |
DE60333036D1 (de) | 2010-07-29 |
EP1591183B1 (en) | 2010-06-16 |
CN1732061A (zh) | 2006-02-08 |
US20060060053A1 (en) | 2006-03-23 |
US20070056424A2 (en) | 2007-03-15 |
JP4622520B2 (ja) | 2011-02-02 |
AU2003289488A1 (en) | 2004-07-22 |
KR20050089982A (ko) | 2005-09-09 |
CN100522433C (zh) | 2009-08-05 |
CN1732061B (zh) | 2010-04-28 |
US7927046B2 (en) | 2011-04-19 |
JP2010221397A (ja) | 2010-10-07 |
KR101029951B1 (ko) | 2011-04-19 |
AU2003289488A8 (en) | 2004-07-22 |
US20080286056A1 (en) | 2008-11-20 |
EP2030713A1 (en) | 2009-03-04 |
ATE471223T1 (de) | 2010-07-15 |
EP1591183A1 (en) | 2005-11-02 |
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