WO2016152611A1 - スクエアエンドミル - Google Patents
スクエアエンドミル Download PDFInfo
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- WO2016152611A1 WO2016152611A1 PCT/JP2016/057928 JP2016057928W WO2016152611A1 WO 2016152611 A1 WO2016152611 A1 WO 2016152611A1 JP 2016057928 W JP2016057928 W JP 2016057928W WO 2016152611 A1 WO2016152611 A1 WO 2016152611A1
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- WIPO (PCT)
- Prior art keywords
- gash
- blade
- blades
- cutting edge
- boundary line
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/08—Side or top views of the cutting edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/08—Side or top views of the cutting edge
- B23C2210/084—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/20—Number of cutting edges
- B23C2210/203—Number of cutting edges four
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/32—Details of teeth
-
- 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
- B23C2210/00—Details of milling cutters
- B23C2210/54—Configuration of the cutting part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2210/00—Details of milling cutters
- B23C2210/64—End milling cutters having a groove in the end cutting face, the groove not being present so as to provide a cutting edge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2230/00—Details of chip evacuation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/34—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools milling cutters
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present invention relates to a square end mill suitable for cutting difficult-to-cut materials such as stainless steel.
- Square end mills are mainly used for side cutting and grooving of dies, but when machining difficult-to-cut materials (work materials) such as stainless steel, chips are likely to be welded to the cutting edge. There is a tendency for the lifetime of From this point, in order to prolong the life of the tool, the square end mill is required to have a function for increasing the machining efficiency and shortening the machining time.
- Chip welding on the cutting edge is also caused by the fact that the chips immediately after cutting by the cutting edge are not immediately discharged from the rake face, so if the chip discharge from the cutting edge rake face is sufficiently secured, It is considered possible to avoid welding.
- the bottom edge rake face and the bottom edge rake face are composed of a plurality of gash faces opposed to the front side in the rotational direction, and the bottom can be guided to the chip discharge groove from the gash.
- a plurality of gash faces facing the blade rake face are applied from the radial center side to the outer peripheral side, and are inclined at an angle close to the rotation axis of the tool body.
- JP 2012-91306 A (Claim 1, paragraphs 0041 to 0042, FIG. 5) JP 2011-67928 A (Claim 2, paragraph 0048, FIG. 8) JP 2006-110683 A (paragraphs 0015 to 0032, FIGS. 2 to 4) JP 2007-296588 A (Claim 1, paragraph 0006, FIG. 1) JP 2006-15418 A (Claim 1, paragraphs 0016 to 0018, FIG. 1)
- the gash surface itself is a flat surface.
- the volume is not increased.
- the gash itself has a convex polygonal shape toward the radially outer peripheral side of the tool body. The volume of the gasche cannot be taken large.
- the gouache itself has a convex polygonal shape contributes to increasing the rigidity of the tool body, but does not increase (increase) the volume of the gouache itself. The benefits of improved emissions are not being exploited.
- the present invention proposes a square end mill that makes it possible to improve chip discharge.
- the square end mill according to the first aspect of the present invention includes a cutting edge portion having a bottom edge and an outer edge continuous to the bottom edge from the radial center side to the outer circumference side on the tip end side in the axial direction of the tool body. And at least one bottom blade continuous from the end on the radially outer side to the center in the radial direction when the bottom blade is viewed from the end face side in the axial direction, and the cutting edge portion.
- a first gash is formed in a region from a line connecting the end of each radial center to the vicinity of the center in the radial direction to each of the base bottom blades on the rear side in the rotational direction.
- a second gash and a third gash are respectively formed on the front side in the rotation direction, and when the first gash, the second gash, and the third gash are viewed from the end face side in the axial direction, It is characterized by being formed in a concave curved shape toward the shank part side on the opposite side in the axial direction of the cutting edge part.
- the bottom edge 4a (4c) is a rotation of the tool body (square end mill 1) when the edge 2 of the bottom edge in the radial direction is viewed from the end face side in the axial direction.
- the bottom blades that reach the vicinity of the axis O indicate the bottom blades
- the bottom blades 4b and 4d indicate the bottom blades that do not reach the vicinity of the rotation axis O in the radial direction center side of the bottom blades.
- the square end mill 1 of the present invention has at least one base bottom blade 4a (4c) and at least two bottom blades 4b and 4d
- the square end mill 1 has three or more blades in terms of the number of blades.
- the drawing shows an example of a square end mill 1 having a four-blade, in which there are two bottom blades 4a and 4c and two bottom blades 4b and 4d.
- “The end on the radial center side of the bottom blade reaches the vicinity of the rotation axis” means that the bottom blade (the base bottom blades 4a, 4c) reaches the chisel edge 35 in the radial direction from the end on the radially outer side. Say to continue to the center.
- the “other end b2, d2 on the outer peripheral side in the radial direction” that identifies the starting point (starting point) of the bottom blade 4b, 4d is the end other than the “end on the outer peripheral side in the radial direction” of the base bottom blade 4a, 4c.
- the bottom blades 4a and 4c and the bottom blades 4b and 4d are both bottom blades, and the plurality of bottom blades are evenly or substantially evenly distributed in the circumferential direction (rotation direction R) of the tool body. Arrange.
- the end portions on the outer peripheral side in the radial direction are arranged evenly or substantially uniformly in the peripheral direction together with the base bottom blades 4a and 4c except for the “end portion on the outer peripheral side in the radial direction of the base bottom blade” in the circumferential direction It becomes the position to do.
- “Equal to the circumferential direction” means that the bottom blades 4a, 4b (4b, 4c) or the peripheral blades 15a, 15b (15b) adjacent to each other in the circumferential direction are not distinguished between the bottom blades 4a, 4c and the bottom blades 4b, 4d. 15c) is constant, and “substantially equal in the circumferential direction” means that the central angles ⁇ , ⁇ formed by the bottom blades or the peripheral blades adjacent in the circumferential direction as shown in FIG. Say not constant.
- first gashs 7a, 7b and second gashs 8a, 8b, and third gashs 10a, 10b formed in a concave curved surface are end faces of the cutting edge portion 2 (shown in FIG. 2). It points to the surface of each gash facing the tip.
- Shanky part side refers to the side opposite to the cutting edge part 2 when the tool body is viewed in the axial direction.
- “Curved concave shape toward the shank part side” means that the surface of each gash is the cutting edge part. When 2 is seen from the end surface side in the axial direction, it says that it is dented toward the shank part 3 side.
- the ends (the start points a2 and c2 of the base blades 4a and 4c) of the base blades 4a and 4c in the radial direction are located near the rotation axis O of the tool body.
- the ends on the radial center side of the blades 4b and 4d (start points b2 and d2 of the bottom blades 4b and 4d) do not reach the vicinity of the rotation axis O.
- the start points b2 and d2 of the bottom blades 4b and 4d define a bottom blade clearance surface (second bottom blade second surfaces 5b and 5d) formed continuously on the rear side in the rotation direction of the bottom blades 4b and 4d. It becomes a point to do.
- the bottom blade flank (second bottom blade second surfaces 5b, 5d) is located on the radially outer peripheral side of the first gash 7a, 7b.
- the “bottom blade flank” refers only to the bottom blade second surfaces 5b and 5d formed continuously on the rear side in the rotation direction R of the bottom blades 4b and 4d, and the bottom blade second surface 5b. In some cases, it includes the bottom face third face 6b, 6d formed continuously on the rear side in the rotational direction of 5d.
- the boundary line (first boundary line) from the start points b2 and d2 of the bottom blades 4b and 4d on the front side in the rotational direction R of the first gashes 7a and 7b. 30a, 30b) continue.
- the boundary lines (first boundary lines 30a and 30b) once go to the center side in the radial direction, project in the middle toward the third gash 10a and 10b on the front side in the rotational direction, and then the second gash 8a on the rear side in the rotational direction.
- the starting points a2, c2 are the ends of the bottom blades 4a, 4c on the center side in the radial direction (Claim 3).
- the bottom edge blades 4a and 4c are formed from the start points a2 and c2 toward the outer peripheral side in the radial direction.
- the first boundary lines 30a and 30b are boundary lines between the first gash 7a and 7b and the third gash 10a and 10b.
- the first boundary lines 30a and 30b from the starting points b2 and d2 of the bottom blades 4b and 4d once protrude toward the third gash 10a and 10b from the radial direction center side, and then the second gash 8a, By returning to the 8b side (Claim 3), it is possible to reduce the influence on the decrease in the volume of the third gash 10a, 10b. It becomes possible. As a result, the third gash 10a, 10b of the chips in the first gash 7a, 7b is maintained to a certain extent without reducing the capacity of the chips cut by the bottom blades 4b, 4d in the third gash 10a, 10b. It is possible to increase the induction effect on
- this effect is obtained when the first boundary lines 30a and 30b form a convex ridge line toward the end face side of the cutting edge portion 2 (Claim 4), or the first boundary lines 30a of the third gashes 10a and 10b.
- the surface (surface) other than 30b is recessed from the first boundary lines 30a, 30b (Claim 6)
- the chips in the first gash 7a, 7b easily fall into the third gash 10a, 10b. Therefore, it is demonstrated remarkably.
- the first boundary lines 30a and 30b form a convex ridge line toward the end face side of the cutting edge part 2
- the first boundary lines 30a and 30b This means that the third gash 10a, 10b on both sides sandwiched and the first gash 7a, 7b form a line that protrudes relatively to the end face side from the surface.
- the first boundary lines 30a and 30b themselves draw a concave curve when viewed from the end face side of the cutting edge portion 2.
- the bottom blade flank (bottom blade second surface 5b) moves backward in the rotational direction.
- 5d or the bottom edge second face 5b, 5d and the bottom edge third face 6b, 6d) and the sixth boundary lines 37a, 37b, which are the boundary lines between the first gash 7a, 7b, are continuous.
- the first gashs 7a and 7b are “from the section near the radial center of the rake surfaces 11a and 11c of the base bottom blades 4a and 4c, on the front side in the rotational direction and on the radial center side of the bottom blades 4b and 4d. In other words, it is formed in an area including the end portions (b2, d2) and continuing to the bottom blade flank face that is continuous on the rear side in the rotational direction of the bottom blades 4b, 4d.
- the boundary lines 31a and 31b continue to the vicinity of the center in the radial direction.
- the tip is continuous with the bottom edge blades 4a, 4c or the rake faces 11a, 11c.
- the second gashes 8a and 8b are arranged on the rear side in the rotation direction of the second boundary lines 31a and 31b, on the boundary line with the blade groove 17a in the section closer to the outer periphery in the radial direction of the rake faces 11a and 11c of the base blades 4a and 4c.
- the third boundary lines 32a and 32b) are formed.
- the second gashs 8a and 8b are “on the rear side in the rotation direction of the first gashs 7a and 7b and in the region up to the bottom blade scoop surfaces 11a and 11c, or the bottom blade flank (second bottom blade second The bottom bottom blade in the rotational direction rear side from the boundary line (second boundary lines 31a, 31b) on the rear side in the rotational direction (passing the intersection points b3, d3) of the surfaces 5b, 5d or the bottom blade third surface 6b, 6d) 4a, 4c, or the bottom edge rake faces 11a, 11c (third boundary lines 32a, 32b).
- first gashs 7a and 7b are “from the first boundary lines 30a and 30b passing through the end portions (b2 and d2) closer to the radial center of the bottom blades 4b and 4d on the rear side in the rotational direction of the bottom blade flank ( In other words, it is formed over the region up to the second boundary lines 31a and 31b (which passes through the intersection points b3 and d3).
- the third gash 10a, 10b is a section (including the start points b2, d2 of the bottom blades 4b, 4d) near the center in the radial direction of the bottom blades 4b, 4d and the rotation of the first boundary lines 30a, 30b continuous thereto.
- the basal blade flank continuous on the rear side in the rotational direction of the basal blades 4a, 4c located on that side (the second basal blade surfaces 5a, 5c, or the third basal surface 6a, 6c) )
- the boundary fourth boundary lines 36a and 36b).
- the third gash 10a, 10b is "in the region from the section near the center in the radial direction of the scoop surfaces 11b, 11d of the bottom blades 4b, 4d to the front side in the rotational direction of the first gash 7a, 7b, or It is formed in the region from the boundary line (fourth boundary line 36a, 36b) on the third gash 10a, 10b side of the bottom blade flank to the bottom blade 4b, 4d and the first gash 7a, 7b on the rear side in the rotation direction. In other words.
- the second gashes 8a and 8b are formed on the rear side in the rotation direction of the first gashes 7a and 7b so as to be continuous with the base scoop surfaces 11a and 11c together with the first gashes 7a and 7b. Is done. For this reason, the second gashes 8a and 8b are arranged along the ridgelines of the base blades 4a and 4c or the surfaces of the base blade scoop surfaces 11a and 11c together with the first gashes 7a and 7b.
- the bottom blades 4b, 4d are perpendicular to the bottom blades 4a, 4c, or It will intersect at a close angle. Therefore, as shown in FIG. 2, the third gash 10a, 10b is positioned on the front side in the rotational direction of the first gash 7a, 7b, and along the base bottom blades 4a, 4c or the base bottom scoop surfaces 11a, 11c.
- the first gashs 7a and 7b are arranged so as to be sandwiched in the ridgeline direction of the base blades 4a and 4c or in the radial direction together with the second gashes 8a and 8b.
- the third gash 10a, 10b and the second gash 8a, 8b sandwich the first gash 7a, 7b in the ridgeline direction of the base blades 4a, 4c, and are arranged along the ridgeline of the base blades 4a, 4c.
- the phrase “along the bottom edge blades 4a and 4c” in claim 2 means “along the ridgelines of the bottom edge blades 4a and 4c”.
- Blade grooves (chip discharge grooves) 17a, 17b, 17c, and 17d are continuous with the second gashes 8a and 8b and the third gashes 10a and 10b in the rotational direction rear side.
- the third gash 10a, 10b and the second gash 8a, 8b are arranged along the ridgeline of the base bottom blades 4a, 4c across the first gash 7a, 7b (Claim 2). Since the two gashs 8a and 8b are positioned on both sides of the first gashs 7a and 7b along the ridgelines of the mains edge blades 4a and 4c, the main gash blades 4a and 4c cut and entered the first gashes 7a and 7b. Chips tend to be dispersed in the second gash 8a, 8b and the third gash 10a, 10b. Chips dispersed in the second gash 8a, 8b and the third gash 10a, 10b are discharged into the blade grooves 17d, 17b, 17a, 17c continuous on the rear side in the respective rotational directions.
- Chips cut by the bottom blades 4a and 4c and entering the second gashes 8b and 8a are discharged into the blade grooves 17d and 17b that are continuous to the rear side in the rotation direction. Chips cut by the bottom blades 4b and 4d and entering the third gash 10a and 10b are discharged to the blade grooves 17d and 17b continuous on the rear side in the rotation direction.
- the surface of the first gash 7a, 7b and the third gash 10a, 10b has a concave curved surface as shown in FIG. 3 and FIG. 4 for discharging chips to the blade grooves 17b, 17a on the rear side in the rotational direction. It is inclined from the boundary lines (first boundary lines 30a, 30b) of both gashes to the blade grooves 17b, 17a on the rear side in the rotation direction of each gasche, and is inclined from the cutting edge part 2 toward the shank part 3.
- the chips that have entered the first gash 7a, 7b are formed on the rear side in the rotational direction. It is considered that there is a strong tendency to be discharged to the blade grooves 17b and 17d on the rear side in the rotation direction via the second gashes 8a and 8b. Therefore, by forming the boundary lines (first boundary lines 30a, 30b) between the third gash 10a, 10b and the first gash 7a, 7b so as to form a convex ridge line toward the end face side of the cutting edge portion 2. (Claim 4) A part of the chips that have entered the first gash 7a, 7b can easily enter (drop) the third gash 10a, 10b.
- the boundary lines (first boundary lines 30a, 30b) between the third gash 10a, 10b and the first gash 7a, 7b form a convex ridgeline” means that the boundary line is toward the end face side of the cutting edge portion 2. It protrudes in a convex shape. As described above, this means that the surfaces (surfaces (concave surfaces)) of the third gashes 10a and 10b other than the boundary lines (first boundary lines 30a and 30b) with the first gashes 7a and 7b are relatively. In other words, when the cutting edge portion 2 is viewed from the end face side in the axial direction, it is deeper than the boundary line with the first gashes 7a and 7b and is recessed (located behind) the boundary line. Can do.
- the surfaces (concave curved surfaces) of the third gashes 10a and 10b are deeper than the boundary lines (first boundary lines 30a and 30b) with the first gashes 7a and 7b, so that they exist in the first gashes 7a and 7b. Since a part of the chips to be cut easily enters (drops) into the third gash 10a, 10b, the chips that have entered the first gash 7a, 7b try to disperse into the second gash 8a, 8b and the third gash 10a, 10b. The tendency to do is strengthened. As a result, it is avoided that the chips concentrate on any of the second gash 8a, 8b and the third gash 10a, 10b and stagnate.
- first boundary line 30a, 30b When viewed from the boundary line (first boundary line 30a, 30b) between the third gash 10a, 10b and the first gash 7a, 7b, as described above, as shown in FIG.
- the front surface) and the surfaces (front surfaces) of the third gashes 10a, 10b are inclined from the boundary line as the ridge line to the blade grooves 17b, 17a on the rear side in the rotation direction of each gasche, and are inclined from the cutting edge portion 2 toward the shank portion 3. is doing.
- chips existing in the vicinity of the boundary lines (first boundary lines 30a and 30b) in the first gash 7a and 7b are located on the front side in the rotational direction, and are also rearward in the rotational direction to the third gashes 10a and 10b.
- the chips in the first gash 7a, 7b are easily dispersed in the second gash 8a, 8b and the third gash 10a, 10b.
- each gash has a function of guiding chips to the blade grooves 17a to 17d
- the surface of each gash is inclined toward the shank part 3 side from the cutting edge part 2 side toward the rear side in the rotation direction.
- the surface on the rear side is relatively deeper than the surface on the front side in the rotational direction. In this relationship, the depth of the surface of each gash when the cutting edge portion 2 is viewed from the end face side cannot be directly compared, but the relative depth between the boundary line between the adjacent gash and the gash surface is not possible.
- the surface of the third gash 10a, 10b is deeper than the boundary line (first boundary line 30a, 30b) with the first gash 7a, 7b, so that the boundary line (first boundary line 30a, 30b) It can be said that it becomes easy to induce the fall of the existing chips to the third gash 10a, 10b.
- Chips entering the first gash 7a, 7b are easily dispersed in the second gash 8a, 8b and the third gash 10a, 10b, so that the chips concentrate on the first gash 7a, 7b or the second gash 8a, 8b.
- it is difficult for stagnation to occur and chips are easily discharged smoothly from the first gash 7a, 7b to the blade grooves 17a-17d.
- the chip discharging performance from the first gash 7a, 7b is improved, the welding to the cutting edge due to the stagnation of the chips is easily avoided, and the tool life can be prolonged.
- the second gash 8a, 8b receives the chips that have entered the first gash 7a, 7b, and guides it to the blade grooves 17d, 17b on the rear side in the rotational direction. Therefore, the second gash 8a, 8b and the first gash 7a , 7b (second boundary lines 31a, 31b) are formed so as to form a convex ridge line toward the end face side of the cutting edge portion 2, that is, the first gash 7a of the second gashes 8a, 8b. It is reasonable to form the second gash 8a, 8b so that the surface other than the boundary line (second boundary line 31a, 31b) with 7b becomes deeper than the boundary line with the first gash 7a, 7b ( Claim 5).
- the second boundary lines 31a and 31b form a convex ridge line toward the end face side of the cutting edge portion 2, a part of the chips that have entered the second gash 8a and 8b from the first gash 7a and 7b are left as they are. It is possible to easily enter (drop) the grooves 17d and 17b.
- the second boundary lines 31a and 31b form a convex ridge line toward the end face side of the cutting edge part 2
- the second boundary lines 31a and 31b This means that the first and second gashes 7a and 7b and the second gashes 8a and 8b sandwiched on both sides form a line that protrudes relatively to the end face side from the surface.
- the second boundary lines 31a and 31b themselves draw a concave curve when viewed from the end face side of the cutting edge portion 2.
- each gash itself has a larger volume than when the surface (surface) is flat, so when a plurality of gashes (gash surfaces) are formed on the square end mill.
- the capacity for storing chips in each gash is increased. This also avoids stagnation of chips in each gash and contributes to improving the discharge efficiency from each gash to the blade grooves 17a to 17d. Therefore, the chip discharge performance using the gash is improved, and The possibility of welding to the cutting edge is further reduced.
- the boundary line (fifth boundary line 34a, 34b) between the third groove 10a, 10b and the blade grooves 17a, 17c continuous on the rear side in the rotational direction and the end b2 on the radial center side of the bottom blades 4b, 4d. , D2 may not always be as expected.
- the boundary lines (the fifth boundary lines 34a and 34b) between the third gash 10a and 10b and the blade grooves 17a and 17c are continuous to the bottom blades 4b and 4d or the rake faces 11b and 11d of the bottom blades 4b and 4d.
- the end portions b2 and d2 on the center side in the radial direction of the bottom blades 4b and 4d are connected to the third gash 10a and 10b and the blade grooves 17c and 17d.
- the ends b2, d2 on the center side in the radial direction of the bottom blades 4b, 4d are boundaries between the third gash 10a, 10b and the blade grooves 17a, 17c (fifth boundary line 34a, 34b) Since the bottom blades 4b, 4d and the third gash 10a, 10b overlap in the radial direction by being positioned on the center side in the radial direction, the chips cut by the bottom blades 4b, 4d are removed from the third gash. 10a and 10b are easy to enter.
- Each surface (surface) of the first gash 7a, 7b, the second gash 8a, 8b, and the third gash 10a, 10b is concave toward the shank part 3 when the cutting edge part 2 is viewed from the end face side.
- the first boundary lines 30a and 30b and the fourth boundary lines 36a and 36b are convex ridgelines, and the intersection of these boundary lines is a convex shape that divides the central side in the radial direction of the first gashes 7a and 7b.
- Extension lines (ridge lines continuous from the start points a2 and c2) of the bottom edge 4a and 4c that are ridge lines intersect. For this reason, the intersection of these three convex ridgelines, or the protruding portion z including the intersection, becomes a region which is convexly convex toward the end face side of the cutting edge portion 2 as shown in FIG. In this relationship, when the square end mill 1 performs the digging process, the protruding portion z easily comes into contact with the work material.
- the fourth gashs 9a and 9b are formed in a region up to the rotation direction rear side (the base bottom blade second surfaces 5a and 5c) of the positioned base bottom blades 4a and 4c (claim 8).
- the protruding portion z that protrudes toward the end face side of the cutting edge portion 2 can be absent, so that the protruding portion z contacts the work material. The possibility of loss due to is eliminated.
- the fourth gashs 9a and 9b can be formed by forming a concave curved surface toward the shank part 3 when the cutting edge part 2 is viewed from the axial end face side. Since the fourth gashs 9a and 9b can also have a function of suppressing the stagnation of the chips, the possibility of welding of the chips to the blade edges in the fourth gashs 9a and 9b is also reduced.
- the second gash and the third gash formed on the front side in the rotation direction are formed in a concave curved shape toward the shank portion side. For this reason, the volume of each gash itself when a plurality of gashes are formed in a square end mill can be enlarged, and the capacity of storing chips in each gash can be increased.
- FIG. 2 is an end view showing an end surface on the cutting edge side of FIG. 1. It is the perspective view which showed a mode when the end surface of FIG. 2 was seen from the radial direction outer peripheral side of the bottom blade. It is the perspective view which showed a mode when the end surface of FIG. 2 was seen from the radial direction outer peripheral side of the base bottom blade. It is the side view which showed a mode when the side surface of the cutting-blade part of FIG. 2 was seen from the radial direction outer peripheral side of the bottom blade. It is the side view which showed a mode when the side surface of the cutting-blade part of FIG.
- FIG. 6 is a sectional view taken along the line ee of FIG. 5.
- FIG. 6 is a sectional view taken along line ff in FIG. 5.
- FIG. 3 is a sectional view taken along line bb in FIG. 2.
- FIG. 3 is a sectional view taken along line cc of FIG.
- FIG. 3 is a dd line view (perspective view) of FIG. 2.
- FIG. 6 is a view (perspective view) taken along line dd of FIG. 2 when a fourth gash is not formed.
- FIG. 2 is a cross-sectional view taken along the line aa in FIG. 1. It is an enlarged view of the broken-line circle
- FIG. 1 and FIG. 2 show a square end mill having a cutting edge portion 2 having a bottom edge and outer peripheral edges 15a to 15d continuous to the bottom edge from the radial center side to the outer peripheral side on the axial front end side of the tool body.
- the cutting edge portion 2 includes at least one bottom edge 4a, 4c continuous from the end on the radially outer side to the center in the radial direction when the cutting edge 2 is viewed from the end surface side in the axial direction, and the cutting edge portion.
- When 2 is viewed from the end face side in the axial direction, it has at least two bottom blades 4b and 4d that continue from the other end portion on the radially outer peripheral side to the middle in the radial direction.
- the drawing shows an example of a four-blade consisting of two bottom blades 4a, 4c and two bottom blades 4b, 4d, but the number of cutting blades is 3-8. is there.
- the number of cutting edges is 2 or less, high-efficiency machining is difficult, and when the number is 9 or more, a sufficient volume of gash cannot be secured, and chip clogging is likely to occur at the initial stage of cutting.
- the high-efficiency machining targeted by the square end mill 1 of the present invention is the feed rate Vf and the axial cut so that the chip discharge amount Qr is 0.2 ⁇ D 2 (D: tool diameter) cm 3 / min or more.
- the feed rate Vf is set to 450 mm / min
- the axial depth of cut ap is set to 1 mm
- the radial depth of cut ae is set to 0.5 mm.
- the base material of the square end mill 1 of the present invention is preferably formed from a WC-based cemented carbide, ceramics or high-speed steel.
- the surface of the cutting edge 2 part of the substrate is coated with an abrasion-resistant hard film.
- the hard coating include TiSiN, TiAlN, TiAlSiN, CrSiN, and AlCrSiN. Specifically, it is selected from nitrides, carbonitrides and oxynitrides containing at least one element selected from the elements Al, Si and B of the periodic table 4A, 5A and 6A group metals. It is preferable to coat a single layer film or two or more kinds of laminated films to a thickness of 3 to 5 ⁇ m.
- first boundary line 30a connecting the end of each bottom blade 4b, 4d on the center side in the radial direction (starting point b2, d2 of the bottom blade 4b, 4d) to the vicinity of the center in the radial direction.
- 30b) to the respective base bottom blades 4a, 4c on the rear side in the rotation direction first gouaches 7a, 7b are formed.
- Second gashes 8a and 8b and third gashes 10a and 10b are respectively formed on the rear side in the rotation direction and the front side in the rotation direction of the first gashes 7a and 7b.
- the first gash 7a, 7b, the second gash 8a, 8b, and the third gash 10a, 10b are concavely curved toward the shank part 3 when the cutting edge part 2 is viewed from the axial end face side. It is formed.
- the outer peripheral blades 15a and 15c are continuous from the ends (a1 and c1) on the radially outer peripheral side of the respective base bottom blades 4a and 4c shown in FIG.
- outer peripheral blades 15b and 15d are continuous from the ends (b1, d1) on the outer peripheral side in the direction.
- the intersections of the end portions on the outer peripheral side in the radial direction of the bottom blades 4a and 4c and the outer peripheral blades 15a and 15c are the connection points a1 and c1, the end portions on the outer peripheral side in the radial direction of the bottom blades 4b and 4d and the outer peripheral blade. Intersections with 15b and 15d are referred to as connection points b1 and d1.
- the bottom edge 4a, 4c is a starting point a2, c2 of the bottom edge 4a, 4c near the radial center of the cutting edge 2 as shown in FIG. And continues to the bottom blades 4b and 4d.
- Lines extending from the vicinity of the center in the radial direction of the bottom blades 4a, 4c (start points a2, c2 of the bottom blades 4a, 4c) to the bottom blades 4b, 4d are the first gash 7a, 7b and the third gash 10a, 10b. (First boundary lines 30a and 30b).
- the starting points a2 and c2 of the base blades 4a and 4c are also intersections of the base blades 4a and 4c and the chisel edge 35, and the first boundary lines 30a and 30b are children from the starting points a2 and c2 of the base blades 4a and 4c.
- the bottom blades 4b and 4d are continuous to the ends b2 and d2 on the center side in the radial direction, forming a convex ridgeline.
- the third boundary 10a and 10b which are partitioned by the first boundary lines 30a and 30b and are relatively close to the blade grooves 17a and 17c, are the first boundary lines.
- the lines 30a and 30b are recessed (recessed) toward the shank portion 3, and are relatively lower (deeper) than the first gashes 7a and 7b.
- the chips present in the vicinity of the first boundary lines 30a and 30b in the first gash 7a and 7b can easily go around the second gash 8a and 8b on the rear side in the rotation direction, and at the same time, the third gash 10a on the front side in the rotation direction. 10b is also likely to enter (drop). For this reason, the chips in the first gash 7a, 7b are easily dispersed in the second gash 8a, 8b and the third gash 10a, 10b.
- the surfaces (concave curved surfaces) of the first gashes 7a and 7b may also be recessed toward the shank portion 3 from the first boundary lines 30a and 30b.
- connection points a1 and c1 of the respective bottom edge blades 4a and 4c and the rotation axis O that is the radial center of the cutting edge portion 2 are connected.
- the angles ⁇ a and ⁇ c formed by the straight line indicated by the broken line and the straight line drawn by the base blades 4a and 4c are 0 to 4 °, preferably 0 to 2 °.
- angles ⁇ b and ⁇ d formed by broken lines connecting the connection points b1 and d1 of the bottom blades 4b and 4d and the rotation axis O with straight lines drawn by the bottom blades 4b and 4d are also 0 to 4 °, 0 to 2 ° is preferable. If ⁇ a to ⁇ d are less than 0 ° (negative angle), the rigidity of the cutting edge is lowered, and if it exceeds 4 °, it becomes difficult to form a gash.
- a second base surface 5a, 5c as a bottom blade clearance surface is continuously formed on the rear side in the rotational direction of each of the bottom blades 4a, 4c, and on the rear side in the rotational direction of each bottom blade 4b, 4d.
- the bottom blade second surfaces 5b and 5d are continuously formed as a bottom blade flank.
- the groove grooves 17a to 17d may be continuous on the rear side in the rotation direction of the secondary bottom blade second surfaces 5a and 5c and the secondary bottom blade second surfaces 5b and 5d, but in the drawing, the secondary bottom blade second surface 5a, 5c and the bottom blade second surfaces 5b, 5d so that the transition from the blade grooves 17a to 17d in a stepwise manner is performed continuously on the rear side in the rotation direction of the respective bottom blade second surfaces 5a, 5c.
- the face surfaces 6a and 6c are formed, and the bottom blade third face 6b and 6d are formed continuously on the rear side in the rotation direction of the bottom blade second face 5b and 5d.
- Boundary lines (fourth boundary lines 36a, 36b) between the bottom flank flank surfaces (second base blade second surfaces 5a, 5c and third base blade third surfaces 6a, 6c) and the third gash 10a, 10b are cutting edges.
- 2 forms a convex ridge line toward the end face side, continues to the first boundary lines 30a and 30b via the vicinity of the center in the radial direction (fourth gashes 9a and 9b described later), branches at the same position, and is the base It continues to the extension line of blade 4a, 4c.
- the fourth boundary lines 36a and 36b form convex ridge lines, so that the third gash 10a and 10b, which are gashes defined by the fourth boundary lines 36a and 36b, are closer to the shank portion 3 than the fourth boundary lines 36a and 36b. It is concave.
- second peripheral surfaces 16a to 16d as peripheral blade flank surfaces are continuously formed on the rear side in the rotational direction of the peripheral blades 15a to 15d.
- Grooves 17a to 17d are present.
- the blade grooves 17a to 17d are formed between the outer peripheral blade second surfaces 16a to 16d and the outer peripheral blades 15b to 15a adjacent to the rear side in the rotation direction.
- outer peripheral blade scoop surfaces 20a to 20d are formed on the front side in the rotational direction of the outer peripheral blades 15a to 15d.
- the outer peripheral blade rake surfaces 20a to 20d constitute blade grooves 17d to 17a that face each other as shown in FIGS. 3 and 4, or are continuous with the blade grooves 17d to 17a. There is no clear boundary between them. In FIG. 4, the boundary line between the blade groove 17d and the outer peripheral rake face 20a is indicated by a broken line, but the broken line is not always visible.
- the outer peripheral blade second surface 16a (to 16d) is minute in the circumferential direction from the outer peripheral blade 15a (to 15d) to the rear side in the rotational direction as shown in FIG. 13 which is an enlarged view of the broken-line circle portion in FIG. Secondary surface 16a1 ( ⁇ 16d1) having a wide width K, and the main secondary surface that continues from the rear to the blade groove 17a ( ⁇ 17d) and increases the distance from the work material toward the rear in the rotational direction. 16a2 ( ⁇ 16d2).
- the minute second surface 16a1 ( ⁇ 16d1) and the main second surface 16a2 ( ⁇ 16d2) may be a flat surface or a curved surface protruding outward in the radial direction.
- the bottom blade rake surfaces 11a and 11c and the bottom blade rake surface 11b, respectively. 11d are formed.
- the first gashs 7b, 7a and the second gashs 8b, 8a are continuous on the front side in the rotation direction of the bottom edge rake surfaces 11a, 11c, and the rotation direction front of the bottom blade rake surfaces 11b, 11d.
- the third gashes 10b and 10a are continuous.
- the bottom blade scoop surfaces 11a and 11c are continuous with the first gashes 7b and 7a in the section near the center in the radial direction. In the close section, it continues to the second gashes 8b, 8a.
- a section near the center in the radial direction of the bottom edge rake surfaces 11a and 11c and a first gash 7b and 7a form a concave curved surface.
- the section near the outer periphery in the radial direction of the bottom edge scoop surfaces 11a and 11c and the second gash 8b and 8a form a discontinuous concave surface, and a clear boundary line appears between both surfaces.
- the blade rake surfaces 11a and 11c and both gashes may form a continuous curved surface or a discontinuous curved surface.
- the virtual boundary line 110 that is not clearly shown between the bottom edge scoop surfaces 11 a and 11 c and the first gash 7 b and 7 a is indicated by a broken line.
- the bottom edge scoop surfaces 11b and 11d and the third gashes 10b and 10a form a discontinuous concave curved surface, but both surfaces may form a continuous curved surface.
- the first boundary lines 30a and 30b are once linearly continuous toward the radial center side from the ends b2 and d2 on the radial center side of the bottom blades 4b and 4d. Then, a bent curve is drawn which protrudes to the third gash 10a, 10b side on the front side in the rotation direction and then returns to the second gash 8a, 8b side.
- the first boundary lines 30a and 30b heading toward the third gash 10a and 10b pass through points c2 and a2 intersecting with the chisel edge 35 via the fourth gashes 9a and 9b, which will be described later, and continue to the base bottom blades 4c and 4a. To do.
- the first boundary lines 30a and 30b starting from the start points b2 and d2 of the bottom blades 4b and 4d are once drawn straight from the start points b2 and d2 to the front in the rotational direction by drawing a straight line toward the center in the radial direction. From the case where it protrudes to the side, the fall of the chip
- the first boundary lines 30a and 30b are drawn from the point on the radial center side of the straight line to the front side in the rotational direction, and then draw bent curves connected to the starting points a2 and c2 of the base blades 4c and 4a. It is also possible to enhance the induction effect of the chips in the first gash 7a, 7b to the third gash 10a, 10b.
- the bottom blade flank surfaces (second bottom blade second surfaces 5b and 5d and bottom blade third surface 6b; 6d) and the first gashes 7b and 7a are partitioned, and sixth boundary lines 37a and 37b forming convex ridge lines are continuous.
- the sixth boundary lines 37a and 37b intersect at the intersections b3 and d3 with the boundary line between the bottom blade flank face (bottom blade third surface 6b and 6d) and the blade grooves 17b and 17d on the rear side in the rotation direction, Second intersection lines 31a and 31b, which will be described later, and third boundary lines 32a and 32b intersect at the intersection points b3 and d3.
- the second boundary lines 31a which divide the first gash 7b, 7a and the second gash 8b, 8a and form a convex ridgeline, 31b intersects, and the second boundary lines 31a and 31b are continuous with the bottom edge scoop surfaces 11a and 11c or the bottom edge blades 4c and 4a. Since the sixth boundary lines 37a and 37b form convex ridge lines, the first gashs 7a and 7b, which are gashes defined by the sixth boundary lines 37a and 37b, are closer to the shank portion 3 than the sixth boundary lines 37a and 37b. It is concave.
- the second boundary lines 31a and 31b form convex ridge lines so that the second boundary lines 31a and 31b are partitioned by the second boundary lines 31a and 31b, and the second caches 8b and 8a, which are relatively close to the blade grooves 17b and 17d, are also first.
- the two boundary lines 31a and 31b are recessed (recessed) toward the shank portion 3 side.
- the second gashes 8a and 8b and the blade grooves 17b and 17d are connected to the base blades 4a and 4c.
- the third boundary lines 32a and 32b that divide and form convex ridge lines start and continue to the bottom edge scoop surfaces 11a and 11c or the bottom edge blades 4a and 4c as shown in FIGS.
- the second gashes 8a and 8b are partitioned by the second boundary lines 31a and 31b, the third boundary lines 32a and 32b, and the bottom edge scoop surfaces 11a and 11c, or the bottom edge blades 4a and 4c.
- the blade grooves 17b and 17d defined by the third boundary lines 32a and 32b are recessed toward the shank portion 3 side from the third boundary lines 32a and 32b. (Dented).
- the fifth boundary lines 34a and 34b form convex ridge lines to divide the third gash 10a and 10b and the blade grooves 17a and 17c. As shown in FIG. 4, the bottom blade rake faces 11b and 11d or the bottom blade It continues to 4b and 4d.
- the third gash 10a, 10b is defined by the first boundary lines 30a, 30b, the fourth boundary lines 36a, 36b and the fifth boundary lines 34a, 34b and the bottom blade rake face 11b, 11d, or the bottom blades 4b, 4d. Is done. Since the fifth boundary lines 34a and 34b form convex ridgelines, the blade grooves 17a and 17c defined by the fifth boundary lines 34a and 34b are recessed toward the shank portion 3 side from the fifth boundary lines 34a and 34b. (Dented).
- a protruding portion z is formed so as to be convex toward the surface side of the cutting edge portion 2. Since this protrusion z may be lost due to contact with the work material during digging, the region including the protrusion z is ground as shown in FIG. As a result, the fourth gashs 9a and 9b are formed, and the protruding portion z is absent.
- first boundary lines 30a, 30b which are the boundary lines of the first gash 7a, 7b and the third gash 10a, 10b, toward the front in the rotational direction or toward the center in the radial direction
- Fourth gashs 9a and 9b are formed in a region up to the second bottom surface 5a and 5c on the rear side in the rotation direction of the bottom blades 4a and 4c located on the front side in the rotation direction.
- the “region from the bending point of the first boundary lines 30a, 30b to the second base surface 5a, 5c” is the second base surface 5a
- 5c is the first gash 7a, 7b and the third gash 10a, 10b. It becomes an area that intersects.
- the flat area (region) of the fourth gash 9a, 9b is small in comparison with the first to third gash, so the chips discharged from the fourth gash 9a, 9b are discharged.
- the fourth gash 9a, 9b is also formed with a concave curved surface when the cutting edge portion 2 is viewed from the end surface side in the same manner as the first to third gashes, so that the work material It is possible to reduce the possibility of contact with the metal and to contribute to the improvement of chip discharge.
- the degree of curvature of the first gash 7a is, for example, when the surface of the first gash 7a forms a cylindrical surface, when the cutting edge portion 2 is cut along a plane perpendicular to the rotation axis O as shown in FIG.
- intersections S1 and S2 of a circle having a diameter of 0.1D (D: tool diameter) and the edge of the first gash 7a centered on the apex T1 of the curved surface including a curve convex toward the rotation axis O of the gash 7a Can be obtained as the ratio (n1 / m1) of the length n1 of the perpendicular line from T1 to the line segment (middle point V1) with respect to the length m1 of the line segment connecting.
- the degree of curvature n1 / m1 decreases as n1 decreases.
- the degree of curvature n1 / m1 of the first gash 7a is appropriately 20 to 50%, preferably 25 to 45%, particularly 30 in terms of securing the rigidity of the base bottom blades 4a and 4c and securing the volume of the first gash 7a. ⁇ 40% is reasonable. If the degree of curvature n1 / m1 is less than 20%, the rigidity of the base bottom blades 4a and 4c is reduced. If it exceeds 50%, the volume of the first gash 7a is reduced and the chip discharge capacity is reduced.
- the curvature of the second gash 8a includes a curve that is convex toward the rotation axis O of the second gash 8a, and the cutting edge portion 2 is cut by a cutting plane orthogonal to the rotation axis O.
- the length n2 ratio (n2 / m2) can be obtained.
- the degree of curvature n2 / m2 of the second gash 8a and the degree of curvature n3 (length from T3 to V3) / m3 of the third gash 10a, 10b ensure the rigidity of the bottom blades 4a, 4c and bottom blades 4b, 4d, respectively.
- 10 to 40% is appropriate, preferably 15 to 35%, particularly 20 to 30%.
- top bottom blades 4a and 4c are cut so that the chips that have entered the first gash 7a and 7b are smoothly discharged without delay to the blade grooves 17b and 17d via the second gash 8a and 8b. Then, it is better that the degree of curvature becomes gradually (smaller) gradually from the first gash 7a, 7b to the blade grooves 17b, 17d.
- the curvature degree of the fourth gash 9b is a line segment connecting the intersection X1 of the fourth gash 9b and the first gash 7b and the intersection X2 of the fourth gash 9b and the third gash 10b.
- the degree of curvature of the fourth gash 9b is suitably 7 to 37%, preferably 12 to 32%, from the viewpoint of securing the rigidity of the base bottom blades 4a and 4c and avoiding contact with the work material in the fourth gash 9b. In particular, 17 to 27% is appropriate.
- the detailed relationship between the length of 9b in the direction along the bottom blades 4b and 4d and the tool diameter D is as follows.
- h3 If h3 is out of this range, the chip capacity in the third gash 10a, 10b is reduced, or the flow of smooth chip discharge to the blade grooves 17a, 17c through the third gash 10a, 10b is hindered. There is a possibility that. If h4 is out of the above range, there is a possibility that the periphery of the fourth gash 9a, 9b may come into contact with the work material, or there is a possibility that the chip holding capacity in the third gash 10a, 10b will be reduced. is there.
- FIG. 9 which is a cross-sectional view taken along the line bb of FIG. 2, the formation angle of the first gash 7a, 7b (the boundary line between the first gash 7a, 7b and the second gash 8a, 8b (second boundary line 31a )
- An angle between the surface of the first gash 7a, 7b in the vicinity and a plane orthogonal to the rotation axis O) ⁇ 1 is suitably about 15 to 35 °. If ⁇ 1 is less than 15 °, the chip storage capacity in the first gash 7a, 7b is reduced, and if it exceeds 35 °, the rigidity of the base bottom blades 4a, 4c may be reduced.
- the formation angle of the second gashes 8a and 8b shown in the same figure (the surface and rotation of the second gashes 8a and 8b near the boundary line (second boundary line 31a) between the first gashes 7a and 7b and the second gashes 8a and 8b)
- An angle ⁇ 1 formed with a plane orthogonal to the axis O is suitably about 40 to 60 °. If ⁇ 1 is less than 40 °, the chip storage capacity in the second gash 8a, 8b is lowered, and if it exceeds 60 °, the rigidity of the base bottom blades 4a, 4c may be lowered.
- the cutting speed is low and the radius relative to the first gashes 7a and 7b is secured while ensuring the rigidity of the base blades 4a and 4c in the vicinity of the rotation axis O where chipping is likely to occur. Since the area
- FIG. 10 which is a cross-sectional view taken along the line cc of FIG. 2, the formation angles of the fourth gashes 9a and 9b (the boundary lines between the third gashes 10a and 10b and the fourth gashes 9a and 9b (the seventh boundary line 33a )
- the angles ⁇ 2 between the surfaces of the third gashes 10a and 10b and the plane orthogonal to the rotation axis O in the vicinity of the boundary line (seventh boundary line 33a) are about 15 to 35 ° and about 40 to 60 °, respectively. is there. If ⁇ 2 and ⁇ 2 are within this range, the third gash 10a, 10b can be widely secured while securing the rigidity of the base blades 4a, 4c in the vicinity of the rotation axis O. The chip discharging performance at 10b can be improved.
- the size of the chips generated by the bottom blades 4b and 4d is determined by the bottom blades 4a and 4c. It is relatively smaller than the size of the generated chips. Therefore, the rotation axes of the third gashes 10a and 10b formed on the front side in the rotation direction of the bottom blades 4b and 4d are from the second gashes 8a and 8b formed on the front side in the rotation direction of the bottom blades 4a and 4c. Even if the length in the O direction is reduced, it can be said that the chip discharge property via the third gashes 10a and 10b is sufficiently ensured.
- the end Q on the radially outer side of the third gash 10a, 10b is positioned closer to the bottom blades 4a-4d than the end P on the radially outer side of the second gash 8a, 8b.
- the length of the third gash 10a, 10b in the direction of the rotation axis O can be suppressed, and the third gash 10a, 10b does not need to be given an unnecessarily large volume.
- the distance H in the rotation axis O direction between the end portion P of the second gash 8a, 8b and the end Q of the third gash 10a, 10b is 0. It is appropriate to be about 0.01 to 0.2D (D: tool diameter).
- H is less than 0.01D, there is no substantial difference between the positions of the end portion P and the end portion Q. Therefore, the rigidity of the square end mill 1 or a part thereof is likely to decrease. There is a possibility that the grindstone may come into contact with the base bottom blades 4a and 4c when the bottom blades 4b and 4d are ground.
- the square end mill 1 of the present invention also has a circumferential direction (rotational direction) for suppressing chatter vibration due to resonance during cutting of the work material as shown in FIG. 12 which is a cross-sectional view taken along line aa of FIG. It is preferable that the center angles connecting the outer peripheral blades 15a and 15b (15b and 15c) adjacent to each other are not equally divided.
- the central angles (division angles) ⁇ and ⁇ at the point-symmetrical positions with respect to the rotation axis O are the same, and the sum of the adjacent central angles ⁇ and ⁇ is 180 °, but the total central angles are different.
- FIG. 12 is a cross-sectional view taken along line aa of FIG. It is preferable that the center angles connecting the outer peripheral blades 15a and 15b (15b and 15c) adjacent to each other are not equally divided.
- the central angles (division angles) ⁇ and ⁇ at the point-symmetrical positions with respect to the rotation axis O are the same, and the sum of
- the central angle ⁇ is mainly set within a range of about 2 to 20% increase of 90 ° (reference angle) obtained by equally dividing the central angle of the circle into four, and preferably within a range of about 4 to 12% increase. .
- the central angle ⁇ is about 92 °, and the adjacent central angle ⁇ is 88 °.
- the central angle ⁇ is 108 °, and the adjacent central angle ⁇ is 88 °.
- center angle ⁇ is less than 2% of the reference angle, the chatter vibration suppression effect cannot be obtained, and if it exceeds 20%, the volume of the blade groove forming the center angle ⁇ becomes too large, and chipping tends to occur on the outer peripheral blade. .
- boundary lines between the third and fourth gashes (seventh boundary line), 34a, 34b ... boundary line between the third gash and the groove (fifth boundary line), 35 ?? chisel edge
- 36a, 36b boundary lines (fourth boundary line) between the third gash and the flank face of the base blade, 37a, 37b ... boundary lines (sixth boundary line) between the first gash and the bottom blade flank, 110 « A virtual boundary line between the rake face of the base blade and the first gash, a1, c1... end portion on the outer peripheral side in the radial direction of the base blade (the connection point between the base blade and the outer blade), a2, c2...
- Rotation axis P Radial outer edge of the second gash
- Q Radial outer edge of the third gash
- R Direction of rotation
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Abstract
Description
前記各の半径方向中心側の端部と半径方向中心付近までを結ぶ線から回転方向後方側の前記各親底刃までの領域に第一ギャッシュが形成され、この第一ギャッシュの回転方向後方側と回転方向前方側にそれぞれ第二ギャッシュと第三ギャッシュが形成され、これらの第一ギャッシュと第二ギャッシュ、及び第三ギャッシュは前記切れ刃部を軸方向の端面側から見たときに、前記切れ刃部の軸方向反対側のシャンク部側へ向かって凹の曲面状に形成されていることを特徴とする。
2……切れ刃部、3……シャンク部、
4a、4c……親底刃、4b、4d……子底刃、
5a、5c……親底刃二番面、5b、5d……子底刃二番面、
6a、6c……親底刃三番面、6b、6d……子底刃三番面、
7a、7b……第一ギャッシュ、8a、8b……第二ギャッシュ、
9a、9b……第四ギャッシュ、10a、10b……第三ギャッシュ、
11a、11c……親底刃すくい面、11b、11d……子底刃すくい面、
15a、15b、15c、15d……外周刃、
16a、16b、16c、16d……外周刃二番面、
16a1、16b1、16c1、16d1……外周刃の微小二番面、
16a2、16b2、16c2、16d2……外周刃の主二番面、
17a、17b、17c、17d……刃溝、
20a、20b、20c、20d……外周刃すくい面、
30a、30b……第一ギャッシュと第三ギャッシュとの境界線(第一境界線)、
31a、31b……第一ギャッシュと第二ギャッシュとの境界線(第二境界線)、
32a、32b……第二ギャッシュと刃溝との境界線(第三境界線)、
33a、33b……第三ギャッシュと第四ギャッシュとの境界線(第七境界線)、
34a、34b……第三ギャッシュと刃溝との境界線(第五境界線)、
35……チゼルエッジ、
36a、36b……第三ギャッシュと親底刃逃げ面との境界線(第四境界線)、
37a、37b……第一ギャッシュと子底刃逃げ面との境界線(第六境界線)、
110……親底刃のすくい面と第一ギャッシュとの仮想境界線、
a1、c1……親底刃の半径方向外周側の端部(親底刃と外周刃との連結点)、
a2、c2……親底刃の半径方向中心側の端部、
a3、c3……第四境界線と親底刃逃げ面の回転方向後方側の境界線との交点、
b1、d1……子底刃の半径方向外周側の端部(子底刃と外周刃との連結点)、
b2、d2……子底刃の半径方向中心側の端部(第一境界線と子底刃との境界)、
b3、d3……第六境界線と子底刃逃げ面の回転方向後方側の境界線との交点、
b4、d4……第三ギャッシュと刃溝との境界線(第五境界線)と、子底刃、もしくは子底刃すくい面との交点、
D……工具の直径、
H……第二ギャッシュの端部Pと第三ギャッシュの端部Qとの、回転軸方向の距離、
K……微小二番面の周方向の幅、
m1、m2、m3、m4:凸曲面の長さ、
n1、n2、n3、n4……凸曲面の高さ、
O……回転軸、
P……第二ギャッシュの半径方向外周側の端部、
Q……第三ギャッシュの半径方向外周側の端部、
R……回転方向、
S1、S2、S3、S4、S5、S6……仮想円とギャッシュとの交点、
T1、T2、T3、T4……ギャッシュの曲面の頂点、
X1……第四ギャッシュと第一ギャッシュとの交点、X2……第四ギャッシュと第三ギャッシュとの交点、
z……突出部、
α、β……隣接する外周刃間の中心角(分割角度)、
δ1……第一ギャッシュの形成角、δ2……第三ギャッシュの形成角、
ε1……第二ギャッシュの形成角、ε2……第四ギャッシュの形成角、
η……微小二番角、λ……主二番角、
θa、θb、θc、θd……回転軸Oと各連結点とを結ぶ直線に対する底刃の角度。
Claims (9)
- 工具本体の軸方向先端部側に、半径方向中心側から外周側へかけて底刃と、この底刃に連続する外周刃を有する切れ刃部を備え、
前記底刃は前記切れ刃部を軸方向の端面側から見たときの半径方向外周側の端部から半径方向中心寄りまで連続する少なくとも1本の親底刃と、前記切れ刃部を軸方向の端面側から見たときの半径方向外周側の他の端部から半径方向中心側の中途まで連続する少なくとも2本の子底刃を持ち、
前記各子底刃の半径方向中心側の端部と半径方向中心付近までを結ぶ線から回転方向後方側の前記各親底刃までの領域に第一ギャッシュが形成され、この第一ギャッシュの回転方向後方側と回転方向前方側にそれぞれ第二ギャッシュと第三ギャッシュが形成され、これらの第一ギャッシュと第二ギャッシュ、及び第三ギャッシュは前記切れ刃部を軸方向の端面側から見たときに、前記切れ刃部の軸方向反対側のシャンク部側へ向かって凹の曲面状に形成されていることを特徴とするスクエアエンドミル。 - 前記第三ギャッシュと前記第二ギャッシュは前記第一ギャッシュを挟み、前記親底刃に沿って配列していることを特徴とする請求項1に記載のスクエアエンドミル。
- 前記切れ刃部を軸方向の端面側から見たとき、前記子底刃の半径方向中心側の端部から連続する、前記第一ギャッシュの回転方向R前方側の境界線が一旦、半径方向中心側へ向かってから、前記第三ギャッシュ側へ突出して前記第二ギャッシュ側へ戻り、前記親底刃の半径方向中心側の端部にまで連続していることを特徴とする請求項1、もしくは請求項2に記載のスクエアエンドミル。
- 前記第三ギャッシュと前記第一ギャッシュとの境界線は前記切れ刃部の端面側へ向かって凸の稜線をなしていることを特徴とする請求項1乃至請求項3のいずれかに記載のスクエアエンドミル。
- 前記第二ギャッシュと前記第一ギャッシュとの境界線は前記切れ刃部の端面側へ向かって凸の稜線をなしていることを特徴とする請求項1乃至請求項4のいずれかに記載のスクエアエンドミル。
- 前記第三ギャッシュの、前記第一ギャッシュとの境界線以外の面は前記切れ刃部を軸方向の端面側から見たとき、前記第一ギャッシュとの境界線より深く、この境界線より凹んでいることを特徴とする請求項4、もしくは請求項5に記載のスクエアエンドミル。
- 前記第三ギャッシュの回転方向後方側に連続する刃溝との境界線が前記子底刃、もしくは前記子底刃のすくい面に連続し、前記切れ刃部を軸方向の端面側から見たときに前記子底刃の半径方向中心側の端部が、前記第三ギャッシュと前記刃溝との前記境界線と、前記子底刃、もしくは前記のすくい面との交点より半径方向中心側に位置していることを特徴とする請求項1乃至請求項6のいずれかに記載のスクエアエンドミル。
- 前記第一ギャッシュと前記第三ギャッシュとの境界線の回転方向前方寄り、もしくは半径方向中心寄りの端部から、その回転方向前方側に位置する前記親底刃の回転方向後方側までの領域に第四ギャッシュが形成されていることを特徴とする請求項1乃至請求項7のいずれかに記載のスクエアエンドミル。
- 前記第三ギャッシュの半径方向外周側の端部Qは前記第二ギャッシュの半径方向外周側の端部Pより前記底刃寄りに位置していることを特徴とする請求項1乃至請求項8のいずれかに記載のスクエアエンドミル。
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