WO2016158463A1 - ドリル - Google Patents
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- WO2016158463A1 WO2016158463A1 PCT/JP2016/058549 JP2016058549W WO2016158463A1 WO 2016158463 A1 WO2016158463 A1 WO 2016158463A1 JP 2016058549 W JP2016058549 W JP 2016058549W WO 2016158463 A1 WO2016158463 A1 WO 2016158463A1
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- WO
- WIPO (PCT)
- Prior art keywords
- drill
- margin
- thinning
- boundary
- rotation axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/06—Drills with lubricating or cooling equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/08—Side or plan views of cutting edges
- B23B2251/082—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/12—Cross sectional views of the cutting edges
- B23B2251/125—Rounded cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/12—Cross sectional views of the cutting edges
- B23B2251/127—Sharp cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
- B23B2251/408—Spiral grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/44—Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
- B23B2251/443—Double margin drills
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
- Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
- Y10T408/9097—Spiral channel
Definitions
- the present invention relates to a drill capable of obtaining a high-quality processed surface.
- Patent Document 1 discloses a drill in which a cutting edge has a convex shape that starts from the cutting corner and continues toward the tip in the axial direction, and has a two-step flank.
- Patent Document 2 discloses a drill that enables high-precision drilling by forming a thinning cutting edge by cutting (thinning) to a position beyond the center of the tool.
- Patent Document 3 discloses a drill that has a main margin and a sub margin, and has improved chipping resistance of the cutting edge by forming a thinning surface in the entire region from the radially inner end to the radially outer end of the cutting edge. Is disclosed.
- an object of the present invention is to provide a drill capable of stably obtaining a high-quality processed surface by suppressing chip clogging and chatter vibration during drilling.
- the drill of the present invention comprises a plurality of convex arcuate cutting edges formed on the tip side of the drill body from the outer periphery of the drill body to a chisel edge near the rotation axis, and the convex arcuate cutting edge. Thinning formed therebetween, a groove formed from the rear end in the rotational axis direction of the thinning toward the rear end side of the drill body, and a rearward direction in the rotation direction of the groove along the outer peripheral edge of the drill body A drill having a first margin formed and a second margin formed along the outer peripheral end in front of the groove in the rotation direction, the drill including the convex arcuate cutting edge along the convex arcuate cutting edge.
- the maximum width of the substantially strip-shaped second face is in the range of 0.02D to 0.1D (D is the diameter of the drill).
- the second angle ⁇ is 10 to 30 °
- the third angle ⁇ is 25 to 45 °
- the fourth angle ⁇ is 50 to 70 °.
- the boundary between the thinning and the third surface forms an angle of 80 to 110 ° with the ridge line of the convex arcuate cutting edge.
- the boundary between the thinning and the third surface preferably forms an angle of 80 to 110 ° with the cutting edge (ridge line of the cutting edge) located behind the thinning in the rotation direction.
- the boundary between the thinning and the third surface is formed in a straight line.
- the end of the rake face of the convex arcuate cutting edge is located behind the start end of the first margin in the rotation direction.
- the diameter of the circle inscribed in the boundary between the thinning and the groove is 30 to 50% of the diameter of the drill.
- the thinning is continued rearward in the rotational direction of the third surface on the distal end side, and the thinning is continued rearward in the rotational direction of the fourth surface on the rear end side, and the distal end side of the drill body
- an angle formed between a boundary between the thinning and the third surface and a boundary between the thinning and the fourth surface is 35 to 55 °.
- the thinning is continued rearward in the rotational direction of the fourth surface, and when viewed from the tip side of the drill body, the thinning is radially outward on the boundary between the thinning and the fourth surface. It is desirable that the distance between the position point and the rotating shaft is 0.2D to 0.45D (D is the diameter of the drill). With this configuration, since the thinning can be widened while improving the strength of the second margin, the chip discharging property can be improved.
- the distance between the point located radially outward on the boundary between the thinning and the convex arcuate cutting edge and the rotation axis is 0.25D to 0.5 It is desirable that D (D is the diameter of the drill). With this configuration, since thinning can be widened, chip dischargeability can be improved.
- the second margin is continuous with the rear end of the fourth surface in the rotation axis direction.
- the width of the second margin can be widened, so that stability during cutting can be improved.
- the rear end in the rotation axis direction of the rake face of the convex arcuate cutting edge is positioned on the rear end side in the rotation axis direction of the drill body from the front end in the rotation axis direction of the first margin.
- the distance between the rear end in the rotation axis direction of the rake face and the front end in the rotation axis direction of the first margin is 0.03D to 0.3D (D Is preferably the diameter of the drill.
- the first margin is continuous with the rear end in the rotation axis direction of the third surface, and the boundary between the first margin and the third surface from the front end in the rotation axis direction of the first margin. It is desirable that the width of the first margin gradually increases to the rear end in the rotation axis direction. With this configuration, the load during cutting can be reduced.
- the first margin is continuous with the rear end in the rotation axis direction of the second surface and the third surface, the boundary between the first margin and the second surface, and the first margin It is desirable that the boundary between the third surface and the third surface is an arc that is convex forward in the rotational direction. With this configuration, the addition during cutting can be further reduced.
- the rake angle of the convex arcuate cutting edge is ⁇ 5 to 0.5 in the range of 0.03D to 0.35D (D is the diameter of the drill) from the tip of the drill body to the rotation axis direction. It is desirable to be °. With this configuration, the rigidity of the cutting edge can be maintained.
- the drill of the present invention includes a substantially strip-shaped second surface formed rearward in the rotational direction along the convex arcuate cutting edge, and a third surface, fourth formed continuously in the rotational direction rearward of the second surface.
- a surface is provided. Therefore, while ensuring the rigidity of the cutting edge, the substantially strip-shaped second surface formed rearward in the rotation direction along the convex arcuate cutting blade, and the third formed continuously in the rearward rotation direction of this second surface Compared with the conventional drill which does not provide a surface and a 4th surface, high chip discharge
- FIG. 2 is a side view of the drill of FIG. 1 (viewed in the direction of arrow A in FIG. 1).
- FIG. 3 is a side view of the drill of FIG. 1 as viewed from an angle different from that of FIG. 2 (viewed in the direction of arrow B in FIG. 1).
- FIG. 4 is a perspective view of the drill of FIG.
- FIG. 5 is a perspective view of the drill of FIG. 3 viewed from an angle different from that of FIG.
- FIG. 4 is a cross-sectional view taken along the line II in FIG.
- rotary axis means the rotary axis of the drill or the drill body
- tip side means the side on which the cutting edge of the drill body is formed in the direction of the rotary axis
- End side means the side opposite to the tip side in the direction of the rotation axis.
- Rotal direction means the rotational direction of the drill or drill body
- radial direction means the direction perpendicular to the rotational axis through the rotational axis.
- Outer periphery means radially outward.
- the drill 100 of the present embodiment includes a plurality of convex arcuate cutting edges 4a and 4b formed from the outer periphery of the drill body 1 to the chisel edge 14 in the vicinity of the rotation axis O at the tip 2 of the drill body 1, and the convex arcuate cutting edges Thinning 12a, 12b formed between 4a, 4b, grooves 15a, 15b formed from the rear end of the thinning 12a, 12b in the rotational axis O direction toward the rear end of the drill body 1, and grooves 15a, 15b
- the cutting edge of the drill 100 is the vicinity of the rotation axis O from the outer periphery of the distal end portion 2 of the drill body 1 (at the front end side intersection of the drill body 1 and the rotation axis O in order to obtain higher machining surface quality.
- Convex arcuate cutting edges 4a and 4b formed in a convex arc shape up to the chisel edge 14 in the vicinity of the tip 50 of the drill body 1).
- the number of cutting edges is preferably 2-4. If the number of cutting edges is less than 2, the machining efficiency will be reduced. If the number of cutting edges is more than 4, the chip discharge area will be narrow, and chip clogging is likely to occur during drilling. .
- a drill 100 includes a drill body 1.
- the drill body 1 has a shape that is rotationally symmetrical with respect to the rotation axis O of the drill 100 by 180 °.
- Two convex arcuate cutting edges 4a and 4b are formed along the rotation axis O at the distal end portion 2 located on the distal end side (the right side in FIG. 2) of the drill body 1.
- the two cutting edges 4a and 4b extend on a virtual plane parallel to the rotation axis O from the outer periphery of the tip 2 to the chisel edge 14 in a convex arc shape.
- the drill body 1 has a cylindrical shank portion (not shown) formed on the rear end side (left side in FIG. 2) of the tip portion 2.
- Rake surfaces 13a and 13b are formed in front of the cutting body 4a and 4b in the rotational direction R of the drill body 1, respectively.
- the rake faces 13a and 13b are surrounded by cutting edges 4a and 4b (ridge lines of the cutting edges 4a and 4b) and a straight line connecting the rear end of the cutting edges 4a and 4b in the rotation axis O direction and the end of the chisel edge 14. It is a plane.
- the rake surfaces 13a and 13b have a predetermined rake angle ⁇ as shown in FIG.
- the second surfaces 5a and 5b are continuously formed behind the cutting edges 4a and 4b in the rotational direction R, respectively, and the second surfaces 5a and 5b are connected to each other via the chisel edge 14.
- the second surfaces 5a and 5b are convex arcuate cutting edges 4a and 4b from the outer periphery of the tip 2 of the drill body 1 to the chisel edge 14 near the rotation axis O (near the tip 50 of the drill body 1). Are formed in a substantially band shape. As shown in FIG.
- the second surfaces 5a and 5b have a predetermined second angle ⁇ (a clearance angle in the direction of the rotation axis O, and an angle formed by a surface perpendicular to the rotation axis O and the second surfaces 5a and 5b. ).
- Third surfaces 6a and 6b are continuously formed behind the second surfaces 5a and 5b in the rotation direction R, respectively. As shown in FIGS. 2 and 3, the third surfaces 6a and 6b are arranged in the rotational direction R rear and the rear end in the rotational axis O direction from the lines (27a and 27b) defining the rotational direction R rear end of the second surfaces 5a and 5b. Extends to the side. Oil holes 10a and 10b are opened on the third surfaces 6a and 6b, respectively. The oil holes 10a and 10b are through holes extending in the direction of the rotation axis O in the drill body 1. As shown in FIG.
- the third surfaces 6a and 6b have a predetermined third angle ⁇ (a clearance angle in the direction of the rotation axis O, and an angle formed by a surface perpendicular to the rotation axis O and the third surfaces 6a and 6b. ).
- the third angle ⁇ is larger than the second angle ⁇ .
- the fourth surfaces 7a and 7b are continuously formed behind the rotation direction R of the third surfaces 6a and 6b, respectively. More specifically, the fourth surfaces 7a and 7b are connected to the rear surfaces of the third surfaces 6a and 6b in the rotation direction R and on the rear end side in the rotation axis O direction. As shown in FIGS. 1, 2, and 4, lines (21a, 21b) that define the rotation direction R rear end of the fourth surfaces 7a, 7b are lines that define the rotation direction R rear end of the third surface 6a, 6b ( 20a, 20b), and substantially fan-shaped regions are formed by the third surfaces 6a, 6b and the fourth surfaces 7a, 7b. As shown in FIG.
- the fourth surfaces 7a and 7b have a predetermined fourth angle ⁇ (a clearance angle in the direction of the rotation axis O, and an angle formed by a surface perpendicular to the rotation axis O and the fourth surfaces 7a and 7b. ).
- the fourth angle ⁇ is larger than the third angle ⁇ .
- the second surfaces 5a and 5b, the third surfaces 6a and 6b, and the fourth surfaces 7a and 7b are successively formed in this order on the rear side in the rotation direction R of the convex arcuate cutting edges 4a and 4b. These surfaces function as flank surfaces of the convex arcuate cutting edges 4a and 4b.
- Thinnings 12b and 12a are provided in front of the rotation direction R of the convex arcuate cutting edges 4a and 4b, respectively. Specifically, the thinnings 12a and 12b are formed continuously in front of the rake faces 13b and 13a in the rotational direction R and continuously in the rotational directions R of the third faces 6a and 6b and the fourth faces 7a and 7b. As shown in FIGS. 1, 4 and 5, the thinnings 12a and 12b are connected to the second surfaces 5a and 5b in the vicinity of the chisel edge 14, and the width in the rotational direction R is from the front end side to the rear end side of the drill body 1. It is getting bigger.
- Grooves 15a and 15b continuous with the thinnings 12a and 12b are formed on the rear ends of the thinnings 12a and 12b.
- the grooves 15a and 15b are spirally extended toward the rear end side of the drill body 1 at a predetermined twist angle.
- First margins 8b and 8a are formed along the outer peripheral edge W behind the rotational direction R of the grooves 15a and 15b.
- the first margins 8a and 8b are convex curved surfaces formed along an outer peripheral end W that is a virtual cylindrical surface having a diameter D of the drill 100. More specifically, the rotation direction R front end of the first margins 8a and 8b is located on the outer peripheral end W, and the rotation direction R rear end of the first margins 8a and 8b is slightly inward in the radial direction from the outer peripheral end W. is seperated.
- the first margins 8a and 8b extend spirally toward the rear end side of the drill body 1 along the grooves 15b and 15a. As shown in FIG. 3, the first margins 8a and 8b are continuous with the rear ends of the cutting edges 4a and 4b, the second surfaces 5a and 5b, and the third surfaces 6a and 6b on the front end side in the rotation axis O direction. Yes.
- 2nd margins 9a and 9b are formed along the outer peripheral edge W in front of the rotation direction R of the grooves 15a and 15b. More specifically, as shown in FIG. 1, the rotational direction R rear end of the second margin 9a, 9b is located on the outer peripheral end W, and the rotational direction R front end of the second margin 9a, 9b is from the outer peripheral end W. Slightly spaced radially inward.
- the second margins 9a and 9b are convex curved surfaces extending spirally toward the rear end side of the drill body 1 along the grooves 15a and 15b. As shown in FIGS. 2 and 4, the second margins 9a and 9b are continuous with the rear ends of the fourth surfaces 7a and 7b at the front ends in the rotation axis O direction.
- 2nd surface 17a, 17b is formed between the first margin 8a, 8b and the second margin 9a, 9b in order to reduce resistance during cutting. More specifically, the second picking surfaces 17a and 17b are formed continuously in the rotational direction R of the first margins 8a and 8b and in front of the rotational direction R of the second margins 9a and 9b.
- the second surface 17a, 17b is located radially inward from the first margin 8a, 8b and the second margin 9a, 9b, and along these first margin 8a, 8b and the second margin 9a, 9b. This is a convex curved surface extending in a spiral manner toward the rear end side of the drill body 1.
- the angle with respect to the radial direction is a negative angle in order to increase the strength of the first margins 8a and 8b.
- Negative lands 16a and 16b (16a is not visible in FIGS. 2 and 5) are formed along the first margins 8a and 8b and the grooves 15b and 15a.
- heels 11a and 11b are formed along the second margins 9a and 9b and the grooves 15b and 15a between the second margins 9a and 9b and the grooves 15a and 15b.
- the heels 11a and 11b are surfaces inclined with respect to the radial direction so that the radially inner ends thereof are located behind the outer ends in the rotational direction R.
- the twist angle of the grooves 15a and 15b of the present embodiment can be appropriately selected from the range of 0 ° to 40 ° according to the work material and processing conditions (the twist angle of the present embodiment is 20 °). .
- the twist angle of the present embodiment is 20 °.
- the maximum width G of the second surfaces 5a and 5b formed in a substantially band shape is preferably within the range of 0.02D to 0.1D (D is the diameter of the drill 100), and within the range of 0.03D to 0.07D. It is more desirable to be formed.
- the third surface 6a is inclined to the rear end side of the drill body 1 at an angle larger than the second surfaces 5a and 5b as shown in FIG. , 6b and the formation surfaces of the fourth surfaces 7a and 7b (that is, regions between the second surfaces 5a and 5b and the thinnings 12a and 12b) can be made larger than those of the conventional drill.
- substantially belt-like means that the cutting edges 4a and 4b and the boundaries 27a and 27b between the second surfaces 5a and 5b and the third surfaces 6a and 6b are substantially parallel (the maximum width and the maximum of the second surfaces 5a and 5b). This means that the second surfaces 5a and 5b are formed so that the difference from the small width is within 0.08D).
- boundaries 27a and 27b between the second surfaces 5a and 5b and the third surfaces 6a and 6b can be selected from a straight line, a curved line, or a combination of a straight line and a curved line.
- the widths of the second surfaces 5a and 5b mean the widths of the second surfaces 5a and 5b in the rotation direction R.
- the third surface which is inclined to the rear end side of the drill body 1 at the third angle ⁇ larger than the second angle ⁇ is behind the rotation direction R of the second surfaces 5a and 5b.
- Surfaces 6a and 6b are formed.
- fourth surfaces 7a and 7b are formed which are inclined toward the rear end side of the drill body 1 at a fourth angle ⁇ larger than the third angle ⁇ .
- the drill 100 according to the present embodiment has the second surfaces 5a and 5b, the third surfaces 6a and 6b, and the fourth surfaces 7a and 7b, thereby reducing the thickness of the cutting edges 4a and 4b of the tip portion 2 of the drill. Since it can be increased as compared with the prior art, it is possible to secure a wider chip discharge region with the fourth angle ⁇ having a large inclination angle while improving the rigidity of the cutting edges 4a and 4b.
- the second surface 5a, 5b, the third surface 6a, 6b, the fourth surface 7a, 7b may be selected as a plane, a curved surface or a surface that is a combination of a plane and a curved surface. It is desirable to use a curved surface that is convex outward in the radial direction. When the concave curved surface is used, the rigidity of the drill is lowered and the possibility of breakage is increased.
- the angle of the second angle ⁇ is 10 to 30 °
- the angle of the third angle ⁇ is 25 to 45 °
- the angle of the fourth angle ⁇ is 50 to 70 ° (where ⁇ ⁇ ⁇ ). desirable.
- the angles ⁇ , ⁇ , and ⁇ are below the lower limit of the numerical range, the resistance during cutting tends to increase.
- the angles ⁇ , ⁇ , and ⁇ are higher than the upper limit of the numerical range, the rigidity of the drill may be reduced.
- the angle of the second angle ⁇ is 12 to 20 °
- the angle of the third angle ⁇ is 27 to 40 °
- the angle of the fourth angle ⁇ is more preferably 55 to 65 ° (where ⁇ ⁇ ⁇ ). .
- the angle ⁇ formed by the boundary 20a between the thinning 12a and the third surface 6a and the cutting edge 4b is preferably 80 to 110 °, and more preferably 85 to 100 °. The same applies to the angle ⁇ between the boundary 20b between the thinning 12b and the third surface 6b and the cutting edge 4a.
- the angle ⁇ is less than 85 °, the regions of the thinnings 12a and 12b are narrowed, so that chip dischargeability may be reduced.
- the second surfaces 5a and 5b and the third surfaces 6a and 6b may become small and the rigidity may be lowered, and the first and second margins 8a, 8b, 9a, and 9b are formed. There is a possibility that the region to be narrowed and chattering of the hole wall is likely to occur due to a decrease in guide performance.
- the boundary 20a between the thinning 12a and the third surface 6a is formed in a straight line when viewed from the tip side of the drill body 1.
- the boundary 20a By forming the boundary 20a in a straight line, the chips are easily divided at the boundary 20a, and the chip discharge performance is further improved. Even if the boundary 20a is curved, the chip cutting effect is exhibited, but the chip discharge performance tends to be inferior to that of the straight line.
- the boundary 20b between the thinning 12b and the third surface 6b is formed in a straight line.
- a straight line connecting the intersection between the boundaries 20a and 20b and the boundaries 21a and 21 and the intersection between the boundaries 20a and 20b and the boundaries 27a and 27b, and the cutting edges 4b and 4a Is defined as an angle ⁇ between the boundaries 20a, 20b and the cutting edges 4b, 4a.
- a circle (thickness circle) U inscribed in the boundaries 23a, 23b between the thinnings 12a, 12b and the grooves 15a, 15b is drawn.
- the diameter (heart thickness) Dw of the circle is preferably 30 to 50% of the diameter D of the drill 100, and more preferably 35 to 45%. Since the cutting edges 4a and 4b of the drill 100 of the present embodiment have a convex arc shape, the resistance at the time of cutting tends to be higher than that of a conventional drill having a substantially triangular tip shape. Therefore, by having a relatively large core thickness as described above, breakage of the drill 100 can be prevented and stable machining can be performed.
- the diameter Dw of the inscribed circle is less than 30% of the diameter D of the drill 100, the possibility of breakage during cutting is increased.
- the diameter Dw of the inscribed circle is more than 50% of the diameter D of the drill 100, there is a possibility that the chip discharge performance is lowered.
- the angle ⁇ formed by the boundary 21a between the thinning 12a and the fourth surface 7a and the boundary 20a between the thinning 12a and the third surface 6a is 35 to It is desirable to be 55 °.
- the angle ⁇ formed by the boundary 21b between the thinning 12b and the fourth surface 7b and the boundary 20b between the thinning 12b and the third surface 6b is preferably 35 to 55 °.
- the angle ⁇ is greater than 55 °, the areas of the thinnings 12a and 12b are narrowed, and there is a possibility that the chip discharge performance is lowered.
- the boundaries 20a and 20b are curved, a straight line connecting the intersection between the boundaries 20a and 20b and the boundaries 21a and 21 and the intersection between the boundaries 20a and 20b and the boundaries 27a and 27b, and the boundaries 21a and 21b
- the angle formed is regarded as the angle ⁇ formed by the boundaries 20a, 20b and the boundaries 21a, 21b.
- the boundary point P between the thinning 12a and the fourth surface 7a is formed within a distance of 0.2D to 0.45D from the rotation axis O. It is desirable.
- the boundary point P is a point located on the outermost radial direction on the boundary 21a between the thinning 12a and the fourth surface 7a, in other words, the intersection of the boundary 23a between the thinning 12a and the groove 15a and the fourth surface 7a. It is.
- the boundary point P between the thinning 12b and the fourth surface 7b be formed within a range of 0.2D to 0.45D from the rotation axis O.
- the distance between the boundary point P and the rotation axis O is more preferably 0.30D to 0.40D.
- the boundary point Q between the thinnings 12a, 12b and the cutting edges 4b, 4a is within a distance of 0.25D to 0.5D from the rotation axis O. It is desirable to be formed.
- the boundary point Q is a point located on the outermost radial direction on the boundary between the thinnings 12a and 12b and the cutting edges 4a and 4b, in other words, the boundaries 23a and 23b between the thinnings 12a and 12b and the grooves 15a and 15b. And the intersection of the cutting edges 4a and 4b.
- the thinnings 12a and 12b By forming the thinnings 12a and 12b so that the boundary point Q appears at the above position, the thinnings 12a and 12b can be widened.
- the distance between the boundary point Q and the rotation axis O is less than 0.25D, the areas of the thinnings 12a and 12b are narrowed, and there is a possibility that the chip discharging performance is deteriorated.
- the distance between the boundary point Q and the rotation axis O is more preferably 0.30D to 0.40D.
- the second margins 9a and 9b of the drill 100 are preferably formed continuously at the rear ends of the fourth surfaces 7a and 7b in the direction of the rotation axis O.
- the widths of the second margins 9a and 9b can be increased. it can.
- stability during cutting is improved.
- the widths of the second margins 9a and 9b are too wide, and there is a concern that the cutting resistance increases.
- the rear end T of the rake face 13b of the drill 100 of the present embodiment in the direction of the rotation axis O is located closer to the rear end side of the drill body 1 than the front end S of the first margin 8b in the direction of the rotation axis O. It is desirable that By satisfying the above conditions, the first margin 8b is arranged behind the cutting edge 4b in the rotation direction R and the rake face 13b is arranged ahead of the cutting edge 4b in the rotation direction R. In other words, with the cutting edge 4b as a boundary, the end of the rake face 13b is located behind the starting end of the first margin 8b in the rotational direction R.
- the first margin 8b comes into contact with the work surface so that the first margin 8b is rubbed.
- the distance between the tip S of the first margin 8b in the direction of the rotation axis O and the rear end T of the rake face 13b in the direction of the rotation axis O is within a range of 0.03D to 0.3D. It is desirable to be formed by.
- the distance is less than 0.03D, the cutting edge 4b between TS can be formed only minutely, so that a higher quality processed surface quality cannot be obtained. If it exceeds 0.3D, the formation area of the second surface 5b becomes small, and the cutting resistance may increase.
- the distance is more preferably 0.05D to 0.15D. The same applies to the rake face 13a and the first margin 8a.
- the rear end of the first margin 8a in the rotational axis O direction from the front end S of the third surface 6a in the rotational axis O direction (the rear end of the boundary 26 between the first margin 8a and the third surface 6a in the rotational axis O direction) X
- the width of the first margin 8a (the width in the rotational direction R) is gradually increased.
- the boundary 25 between the first margin 8a and the second surface 5a and the boundary 26 between the first margin 8a and the third surface 6a have a convex arc shape toward the front in the rotation direction R.
- the cutting load can be further reduced.
- FIG. 6 is a cross-sectional view (II cross-sectional view of FIG. 3) orthogonal to the rotation axis O at a position 0.15D away from the tip 50 of the drill 100 in the rear end direction of the drill body 1 in the rotation axis O direction.
- the radial rake angle ⁇ within the range of 0.03D to 0.35D from the tip 50 is preferably ⁇ 5 to ⁇ 0.5 ° in order to maintain the rigidity of the cutting edge. If the rake angle ⁇ in the radial direction is set larger than ⁇ 0.5 °, chipping may occur due to insufficient rigidity of the blade edge.
- the rake angle ⁇ in the radial direction is set to a negative angle rather than ⁇ 5 °, the cutting resistance tends to increase.
- the rake angle ⁇ in the radial direction is more preferably ⁇ 4 to ⁇ 1 °.
- the drill which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
- the said embodiment demonstrated the drill provided with two cutting edges, it is not limited to this. Even when the number of cutting blades is 3 or 4, the effects of the present invention can be achieved by adopting the above-described configuration.
- the shape of the drill body may be 120 ° or 90 ° rotationally symmetric with respect to the rotation axis.
- high chip discharge is obtained while ensuring the rigidity of the cutting edge, so that a high-quality processed surface can be obtained in drilling.
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Abstract
Description
本願は、2015年3月30日に、日本に出願された特願2015-069419号に基づき優先権を主張し、その内容をここに援用する。
前記の特徴を有することで、従来に比べて切削加工時に刃先にかかる負荷を低減できるとともに、切り屑排出領域も広くなり、高品質な加工面品位を得られる。
1 ドリル本体
2 ドリル本体の先端部
4a、4b:凸円弧状切れ刃
5a、5b:二番面
6a、6b:三番面
7a、7b:四番面
8a、8b:第一マージン(溝15a、15bの回転方向R後方の外周端)
9a、9b:第二マージン(溝15a、15bの回転方向R前方の外周端)
10a、10b:オイルホール
11a、11b:ヒール
12a、12b:シンニング
13a、13b:すくい面
14:チゼルエッジ
15a、15b:溝
16a、16b:ネガランド
17a、17b:二番取り面
20a、20b:シンニングと三番面との境界
21a、21b:シンニングと四番面との境界
23a、23b:シンニングと溝との境界
25:二番面と第一マージンとの境界
26:三番面と第一マージンとの境界
27a、27b:二番面と三番面との境界
50:ドリル本体の先端
100:ドリル
D:ドリルの直径
Dw:心厚
G:二番面の幅
O:回転軸
P:シンニングと四番面との境界点
Q:シンニングと切れ刃との境界点
R:回転方向
S:第一マージンの始端(回転軸方向先端)
T:すくい面の終端(回転軸方向後端)
U:心厚円
X:三番面の終端(回転軸方向後端)
W:外周端
α:二番角
β:三番角
γ:四番角
δ:すくい角
ε:シンニングと三番面との境界と、シンニングと四番面との境界とのなす角
θ:シンニングと三番面との境界と切れ刃のなす角
Claims (16)
- ドリル本体の先端側に前記ドリル本体の外周から回転軸近傍のチゼルエッジまで形成された複数の凸円弧状切れ刃と、前記凸円弧状切れ刃間に形成されたシンニングと、前記シンニングの回転軸方向後端から前記ドリル本体の後端側に向かって形成された溝と、前記溝の回転方向後方に前記ドリル本体の外周端に沿って形成された第一マージンと、前記溝の回転方向前方に前記外周端に沿って形成された第二マージンとを有するドリルであって、
前記凸円弧状切れ刃に沿って前記凸円弧状切れ刃の回転方向後方に形成された略帯状の二番面と、前記二番面の回転方向後方に連続して形成された三番面と、前記三番面の回転方向後方に連続して形成された四番面とを有することを特徴とするドリル。 - 請求項1に記載のドリルにおいて、前記略帯状の二番面の最大幅は0.02D~0.1D(Dは当該ドリルの直径)の範囲内であることを特徴とするドリル。
- 請求項1又は2に記載のドリルにおいて、二番角αが10~30°であり、三番角βが25~45°であり、四番角γが50~70°であることを特徴とするドリル。
- 請求項1乃至3のいずれか一項に記載のドリルにおいて、
前記ドリル本体の先端側から見たとき、前記シンニングと前記三番面との境界は前記凸円弧状切れ刃の稜線と80~110°の角度をなしていることを特徴とするドリル。 - 請求項1乃至4のいずれか一項に記載のドリルにおいて、
前記ドリル本体の先端側から見たとき、前記シンニングと前記三番面との境界が直線状に形成されていることを特徴とするドリル。 - 請求項1乃至5のいずれか一項に記載のドリルにおいて、前記凸円弧状切れ刃のすくい面の終端が前記第一マージンの始端よりも回転方向後方に位置することを特徴とするドリル。
- 請求項1乃至6のいずれか一項に記載のドリルにおいて、前記ドリル本体の先端側から見たとき、前記シンニングと前記溝との境界に内接する円の直径が、前記ドリルの直径の30~50%であることを特徴とするドリル。
- 請求項1乃至7のいずれか一項に記載のドリルにおいて、
前記シンニングはその先端側において前記三番面の回転方向後方に連続し、
前記シンニングはその後端側において前記四番面の回転方向後方に連続し、
前記ドリル本体の先端側から見たとき、前記シンニングと前記三番面との境界と、当該シンニングと前記四番面との境界とのなす角度が35~55°であることを特徴とするドリル。 - 請求項1乃至8のいずれか一項に記載のドリルにおいて、
前記シンニングは前記四番面の回転方向後方に連続し、
前記ドリル本体の先端側から見たとき、前記シンニングと前記四番面との境界上の径方向最外方に位置する点と前記回転軸との距離が0.2D~0.45D(Dは当該ドリルの直径)であることを特徴とするドリル。 - 請求項1乃至9のいずれか一項に記載のドリルにおいて、前記ドリル本体の先端側から見たとき、前記シンニングと前記凸円弧状切れ刃との境界上の径方向最外方に位置する点と前記回転軸との距離が0.25D~0.5D(Dは当該ドリルの直径)であることを特徴とするドリル。
- 請求項1乃至10のいずれか一項に記載のドリルにおいて、前記第二マージンは前記四番面の前記回転軸方向後端に連続していることを特徴とするドリル。
- 請求項1乃至11のいずれか一項に記載のドリルにおいて、
前記凸円弧状切れ刃のすくい面の回転軸方向後端が前記第一マージンの回転軸方向先端よりも前記ドリル本体の回転軸方向後端側に位置することを特徴とするドリル。 - 請求項12に記載のドリルにおいて、前記ドリル本体の先端側から見たとき、前記すくい面の回転軸方向後端と前記第一マージンの回転軸方向先端との距離が0.03D~0.3D(Dは当該ドリルの直径)であることを特徴とするドリル。
- 請求項1乃至13のいずれか一項に記載のドリルにおいて、
前記第一マージンは前記三番面の回転軸方向後端に連続しており、
前記第一マージンの回転軸方向先端から、前記第一マージンと前記三番面との境界の回転軸方向後端まで、前記第一マージンの幅が漸増していることを特徴とするドリル。 - 請求項1乃至14のいずれか一項に記載のドリルにおいて、
前記第一マージンは前記二番面及び前記三番面の回転軸方向後端に連続しており、
前記第一マージンと前記二番面との境界、及び前記第一マージンと前記三番面との境界が、回転方向前方に凸となる円弧であることを特徴とするドリル。 - 請求項1乃至15のいずれか一項に記載のドリルにおいて、
前記ドリル本体の先端から前記回転軸方向に0.03D~0.35D(Dは当該ドリルの直径)の範囲において、前記凸円弧状切れ刃のすくい角が-5~0.5°であることを特徴とするドリル。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
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| EP16772346.9A EP3278911B1 (en) | 2015-03-30 | 2016-03-17 | Drill |
| JP2016548201A JP6057038B1 (ja) | 2015-03-30 | 2016-03-17 | ドリル |
| US15/554,503 US10279398B2 (en) | 2015-03-30 | 2016-03-17 | Drill |
| CN201680013296.8A CN107427935B (zh) | 2015-03-30 | 2016-03-17 | 钻头 |
| KR1020177024921A KR101983487B1 (ko) | 2015-03-30 | 2016-03-17 | 드릴 |
Applications Claiming Priority (2)
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| JP2015-069419 | 2015-03-30 | ||
| JP2015069419 | 2015-03-30 |
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| PCT/JP2016/058549 Ceased WO2016158463A1 (ja) | 2015-03-30 | 2016-03-17 | ドリル |
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|---|---|
| US (1) | US10279398B2 (ja) |
| EP (1) | EP3278911B1 (ja) |
| JP (6) | JP6057038B1 (ja) |
| KR (1) | KR101983487B1 (ja) |
| CN (1) | CN107427935B (ja) |
| WO (1) | WO2016158463A1 (ja) |
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| Publication number | Publication date |
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| JP2017007089A (ja) | 2017-01-12 |
| US10279398B2 (en) | 2019-05-07 |
| CN107427935B (zh) | 2019-04-19 |
| EP3278911B1 (en) | 2020-04-15 |
| JP6086172B2 (ja) | 2017-03-01 |
| JP6086170B2 (ja) | 2017-03-01 |
| JP2017007090A (ja) | 2017-01-12 |
| KR101983487B1 (ko) | 2019-05-28 |
| JPWO2016158463A1 (ja) | 2017-04-27 |
| US20180043441A1 (en) | 2018-02-15 |
| CN107427935A (zh) | 2017-12-01 |
| JP2017013229A (ja) | 2017-01-19 |
| JP2017013230A (ja) | 2017-01-19 |
| EP3278911A1 (en) | 2018-02-07 |
| JP2017013231A (ja) | 2017-01-19 |
| JP6086174B2 (ja) | 2017-03-01 |
| JP6086171B2 (ja) | 2017-03-01 |
| KR20170110706A (ko) | 2017-10-11 |
| EP3278911A4 (en) | 2018-11-21 |
| JP6086173B2 (ja) | 2017-03-01 |
| JP6057038B1 (ja) | 2017-01-11 |
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