WO2016080305A1 - ドリル及びそれを用いた切削加工物の製造方法 - Google Patents
ドリル及びそれを用いた切削加工物の製造方法 Download PDFInfo
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- WO2016080305A1 WO2016080305A1 PCT/JP2015/081979 JP2015081979W WO2016080305A1 WO 2016080305 A1 WO2016080305 A1 WO 2016080305A1 JP 2015081979 W JP2015081979 W JP 2015081979W WO 2016080305 A1 WO2016080305 A1 WO 2016080305A1
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- WIPO (PCT)
- Prior art keywords
- groove
- drill
- region
- rotation axis
- chips
- Prior art date
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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
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G15/00—Boring or turning tools; Augers
- B27G15/02—Drills for undercutting holes
-
- 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
- B23B2251/043—Helix 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
- B23B2251/04—Angles, e.g. cutting angles
- B23B2251/043—Helix angles
- B23B2251/046—Variable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/24—Overall form of drilling tools
- B23B2251/241—Cross sections of the diameter of the drill
-
- 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
- B23B2251/402—Flutes, i.e. chip conveying grooves with increasing depth in a direction towards the shank from the tool tip
-
- 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
- B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for
-
- 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
-
- 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
- This aspect relates to a drill used for cutting and a method for manufacturing a cut product.
- Patent Document 1 a drill described in Japanese Patent Laid-Open No. 9-277108 (Patent Document 1) is known as a drill used for cutting a work material such as a metal member.
- the drill described in Patent Document 1 includes a twisted groove having an intermediate portion in which the groove width gradually increases from the front end side toward the rear end side and the helix angle gradually decreases.
- the twist angle of the twist groove is small on the rear end side, the moving distance of the chips is small.
- This aspect has been made in view of the above problems, and an object thereof is to provide a drill that can discharge chips well.
- a drill includes a rod-shaped drill body extending along a rotation axis, a cutting blade located at a tip of the drill body, and a spiral shape from the cutting blade toward a rear end side of the drill body. And an extended first groove.
- the first groove is located on the front end side and has a first region having a twist angle ⁇ 1, and on the rear end side of the first region, the first groove has a twist angle ⁇ 2 smaller than the twist angle ⁇ 1.
- region has the protruding item
- FIG. 1st Embodiment It is a perspective view which shows the drill of 1st Embodiment. It is a front view from the front-end
- the drills of the first embodiment and the second embodiment will be described in detail with reference to the drawings.
- the drill of the present invention may include any component not shown in the drawings to which the present specification refers.
- the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.
- the drill 1 As shown in FIG. 1, the drill 1 according to the first embodiment includes a drill body 3 (hereinafter also simply referred to as a body 3), a cutting blade 5, and a pair of first grooves 7 (hereinafter referred to as discharge grooves 7 (flute). ))).
- a drill body 3 hereinafter also simply referred to as a body 3
- a cutting blade 5 and a pair of first grooves 7 (hereinafter referred to as discharge grooves 7 (flute). ))).
- the main body 3 has a rotation axis X, and has a rod-like configuration extending along the rotation axis X.
- the main body 3 rotates about the rotation axis X.
- the main body 3 in the present embodiment includes a grip portion 9 and a cutting portion 11.
- the grip portion 9 is a portion that is gripped by a rotating spindle or the like of a machine tool (not shown), and is a portion that is designed according to the shape of the spindle or the like in the machine tool.
- the cutting part 11 is a part including a part that is located on the distal end side of the gripping part 9 and is in contact with the work material, and has a main role in the cutting work of the work material. Note that an arrow Y in FIGS. 1 and 2 indicates the rotation direction of the main body 3 around the rotation axis X.
- the cutting portion 11 in the present embodiment has a shape excluding a portion corresponding to the pair of discharge grooves 7 and the clearance 13 a (clearance) from a column extending along the rotation axis X.
- portions corresponding to the margin 13b and the like have an arc shape located on the same circle. The diameter of this same circle corresponds to the outer diameter of the cutting part 11.
- the outer diameter of the cutting part 11 is set to 6 mm to 42.5 mm.
- L 3D to 12D is set. Is done.
- the material of the main body 3 is a cemented carbide containing WC (tungsten carbide) and Co (cobalt) as a binder, and an additive such as TiC (titanium carbide) or TaC (tantalum carbide). And alloys such as stainless steel and titanium.
- the drill 1 has a cutting edge 5 located at the tip of the main body 3.
- the cutting blade 5 is a part for cutting a work material.
- the cutting blade 5 in this embodiment is comprised by a pair of main cutting blade 5a and the sub cutting blade 5b, as shown in FIG.
- the pair of main cutting edges 5 a and sub cutting edges 5 b are formed at the tip of the main body 3, that is, at the tip of the cutting part 11.
- the sub cutting edge 5b intersects the rotation axis X when the main body 3 is viewed from the tip.
- the sub cutting edge 5b in the present embodiment functions as a so-called chisel edge.
- the cutting edge 5 has a pair of main cutting edges 5a, but there is no problem even if there is only one main cutting edge 5a.
- the pair of main cutting edges 5a are respectively connected to both ends of the sub cutting edge 5b, and extend from the both ends of the sub cutting edge 5b toward the outer periphery of the main body 3 when viewed from the front end.
- the workpiece is cut by the pair of main cutting edges 5a and sub cutting edges 5b.
- the secondary cutting edge 5b is used as a chisel edge
- the chisel angle is set to about 130 to 170 °, for example.
- the front end view means that the main body 3 is viewed from the front end side along the rotation axis X as shown in FIG.
- the pair of main cutting edges 5a in the present embodiment has a concave curve shape when viewed from the front end. Thereby, since it becomes easy to curl the chip
- FIG. Further, when the main body 3 is cut along a virtual plane including the rotation axis X, the rotation trajectory of the pair of main cutting edges 5a is provided so as to be inclined with respect to the rotation axis X in order to improve the machinability.
- the inclination angle of the pair of main cutting edges 5a with respect to the rotation axis X is set to about 50 to 85 °.
- the pair of main cutting edges 5a are positioned away from each other via the sub cutting edge 5b as shown in FIG.
- the pair of main cutting edges 5a have a rotational symmetry of 180 ° around the rotation axis X of the main body 3 when viewed from the front end side (front side). Since the pair of main cutting edges 5a are rotationally symmetric as described above, it is possible to suppress blurring that occurs between the pair of main cutting edges 5a when the pair of main cutting edges 5a bite against the work material. Therefore, stable drilling can be performed.
- a pair of discharge grooves 7 extends from the cutting edge 5 toward the rear end side of the main body 3 on the outer periphery of the cutting portion 11 in the main body 3.
- the pair of discharge grooves 7 extends spirally around the rotation axis X.
- a pair of discharge grooves 7 extend in a spiral shape from the pair of main cutting edges 5 a in the cutting edge 5 toward the rear end side of the main body 3.
- region connected to a pair of discharge groove 7 among the cutting blades 5 is a pair of main cutting edges 5a, and the area
- the pair of discharge grooves 7 in the present embodiment are formed only in the cutting part 11 and are not formed in the holding part 9.
- the pair of discharge grooves 7 is mainly intended to discharge chips generated by the pair of main cutting edges 5a and sub cutting edges 5b to the outside. At the time of cutting, chips formed on one of the pair of main cutting edges 5a pass through the discharge groove 7 connected to the main cutting edge 5a of the pair of discharge grooves 7 to the rear end side of the main body 3. And discharged. Further, the chips formed on the other side of the pair of main cutting edges 5a pass through the discharge groove 7 connected to the other main cutting edge 5a in the pair of discharge grooves 7, and are on the rear end side of the main body 3. Is discharged.
- One of the pair of discharge grooves 7 in the present embodiment rotates the other of the pair of discharge grooves 7 by 180 ° around the rotation axis X in order to allow each of the chips generated by the pair of main cutting edges 5a to flow well. Are formed so as to overlap each other.
- the pair of discharge grooves 7 in the present embodiment includes a first region 15 and a second region 17, respectively, as shown in FIGS.
- the 1st field 15 is located in the tip side in discharge slot 7, and is connected to main cutting edge 5a.
- the second region 17 is located on the rear end side with respect to the first region 15. Between the first region 15 and the second region 17, a connection region 19 that connects these regions is provided. That is, the discharge groove 7 includes a first region 15, a connection region 19, and a second region 17.
- the first region 15 has a helix angle ⁇ ⁇ b> 1
- the second region 17 has a twist angle ⁇ ⁇ b> 2 smaller than the twist angle ⁇ ⁇ b> 1 in the first region 15.
- the twist angle is constant.
- the connection region 19 since the connection region 19 connects the first region 15 and the second region 17, the twist angle of the connection region 19 changes from ⁇ 1 to ⁇ 2 as it goes from the front end side to the rear end side. ing.
- the discharge groove 7 does not have to have the connection region 19, but when the connection region 19 is provided as in the present embodiment, chips are less likely to be clogged. Specifically, since the twist angle is different between the first region 15 and the second region 17, the direction in which chips flow changes between these regions. However, since the connection area
- the torsion angle means an angle formed between a leading edge and a virtual straight line parallel to the rotation axis X.
- the leading edge is indicated by an intersecting line formed by the discharge groove 7 and a margin 13b located behind the discharge groove 7 in the rotational direction Y of the rotation axis X.
- the intersection line formed by the discharge groove 7 and the clearance 13a located on the front side in the rotation direction Y of the rotation axis X with respect to the discharge groove 7 is specified. Then, an angle formed by a virtual straight line passing through one point on the intersection line and parallel to the rotation axis X may be evaluated as a twist angle.
- the first region 15 is located on the tip side of the discharge groove 7 so as to be connected to the main cutting edge 5a. Therefore, the chips cut by the main cutting edge 5a are promptly sent out to the rear end side of the cutting part 11 without stagnation near the main cutting edge 5a.
- the discharge groove 7 in the present embodiment includes a second region 17 located on the rear end side of the first region 15. Chips promptly fed from the first region 15 can be further fed to the rear end side of the cutting part 11. Further, since the second region 17 has a relatively small twist angle ⁇ 2, the rigidity of the main body 3 can be increased as compared with the case where the twist angle ⁇ 2 has the same value as the twist angle ⁇ 1.
- the twist angle ⁇ 1 can be set to, for example, about 15 to 45 °.
- the twist angle ⁇ 2 may be a value smaller than the twist angle ⁇ 1, and can be set to about 3 to 20 °, for example.
- the protruding strip portion 21 has a tip in the second region 17. It means a state extending spirally around the rotation axis X from the side toward the rear end side.
- the second region 17 does not form one concave curve shape, but a ridge 21 along the discharge groove 7 is formed at the bottom of the second region 17. Therefore, the chips are easily separated from the second region 17 in the ridge portion 21. Thereby, in the area
- the bottom means that it is not an opening portion adjacent to the clearance 13a and the margin 13b in the discharge groove 7. That is, the depth in the discharge groove 7 is not limited to the largest part.
- the second region 17 of the discharge groove 7 includes a second groove 17a and a third groove 17b.
- a protruding strip portion 21 is provided on the boundary between the second groove 17a and the third groove 17b. Therefore, the second groove 17a and the third groove 17b also extend spirally around the rotation axis X.
- the discharge groove 7 is formed.
- the ridge portion 21 can be easily formed.
- the second groove 17 a in the second region 17 is continuous with the connection region 19, and the third groove 17 b in the second region 17 is separated from the connection region 19. positioned.
- the twist angle of the discharge groove 7 is ⁇ 1 in the first region 15, and changes from ⁇ 1 to ⁇ 2 in the connection region 19 from the front end side to the rear end side of the main body 3. Since the twist angle changes in this way, the direction in which the chips flow also changes. For this reason, the behavior of the chips tends to become unstable at the location where the direction in which the chips flow changes.
- the third groove 17 b in the second region 17 is located away from the connection region 19, and the ridge portion 21 is located away from the connection region 19. For this reason, the chips flowing into the second region 17 first flow only in the second groove 17a, so that the direction in which the chips flow in the second region 17 can be stabilized in the second groove 17a. Thereby, the behavior of the chips flowing into the second region 17 is easily stabilized.
- the third groove 17b is located along the second groove 17a on the front side in the rotational direction Y of the rotation axis X with respect to the second groove 17a.
- the third groove 17b is formed between the second groove 17a in the first region 15 and the clearance 13a located on the front side in the rotational direction Y of the rotation axis X with respect to the second groove 17a. Is provided.
- the third groove 17b is provided along the second groove 17a on the front side in the rotational direction Y of the rotation axis X, the possibility of chips coming into contact with the third groove 17b is further reduced. . Therefore, the chip dischargeability can be further increased.
- the chips 3 are relatively easily pressed against the rear side in the rotation direction Y of the discharge groove 7 as the main body 3 rotates.
- the third groove 17b is provided along the second groove 17a on the front side in the rotation direction Y of the rotation axis X, the second groove 17a in which chips are located on the rear side in the rotation direction Y is provided. Easy to be pressed against. Further, it is difficult for chips to be pressed against the third groove 17b located on the front side in the rotational direction Y. Therefore, it becomes more difficult for chips to come into contact with the third groove 17b.
- the second groove 17a and the third groove 17b each have a concave curve shape. Since the chip flows through the second groove 17a, the flow of the chip can be made smooth by the second groove 17a having a concave curve shape. In addition, since the third groove 17b has a concave curved shape like the first region 15, even when the chips come into contact with the third groove 17b, the chips are not easily clogged with the third groove 17b. Become.
- the second groove 17a and the third groove 17b have arc shapes having the same curvature radius.
- the flow of chips can be made smoother.
- channel 17b is the same as the curvature radius of the 2nd groove
- the second groove 17 a and the third groove 17 b are line symmetric based on the ridge portion 21.
- the second region 17 is constituted by the second groove 17a and the third groove 17b, the second groove 17a is formed while the surface of the second region 17 is formed in an arc shape. It is possible to position the ridge portion 21 between the second groove 17b and the third groove 17b.
- the second groove 17a and the third groove 17b are formed under the same processing conditions because the second groove 17a and the third groove 17b have an arc shape with the same curvature radius. Can be formed. Therefore, the drill 1 can be manufactured more easily.
- the same radius of curvature does not require that the radius of curvature be exactly the same. There is no problem even if there is a slight difference of about 5% between the radius of curvature of the second groove 17a and the radius of curvature of the third groove 17b.
- the discharge groove 7 in the present embodiment has a ridge portion 21 at the boundary between the second groove 17a and the third groove 17b in the second region 17. That is, in the cross section orthogonal to the rotation axis X, the second region 17 constituted by the second groove 17a and the third groove 17b does not form one concave curve shape, On the boundary between the groove 17a and the third groove 17b, a ridge portion 21 protruding outward is provided.
- the protruding strip portion 21 is positioned between the second groove 17a and the third groove 17b, the chips that have advanced through the second groove 17a are discharged from the discharge groove 7 in the protruding strip portion 21. It becomes easy to move away from the third groove 17b. Therefore, the area of the part which the chip
- the third groove 17b extends spirally around the rotation axis X, and the twist angle of the third groove 17b is the same value as the twist angle ⁇ 2 of the second groove 17a. Therefore, play can be provided between the chips and the second region 17 without excessively increasing the third groove 17b. Moreover, since the 3rd groove
- the groove width W1 of the second groove 17a is wider than the groove width W2 of the third groove 17b.
- the third groove 17b is preferably provided along the second groove 17a on the front side in the rotation direction Y of the rotation axis X as in this embodiment, but is limited to such a configuration. It is not something.
- the third groove 17 b may be provided along the second groove 17 a on the rear side in the rotation direction Y of the rotation axis X.
- the third groove 17b is formed between the second groove 17a in the first region 15 and the margin 13b located on the rear side in the rotation direction Y of the rotation axis X with respect to the second groove 17a. It may be provided.
- the intersection line between the margin 13b and the third groove 17b is the leading edge.
- the chips that have advanced through the second groove 17 a are secondly projected at the ridge portion 21 located between the second groove 17 a and the third groove 17 b. It becomes easy to move away from the region 17 and away from the third groove 17b.
- the chips that have advanced through the third groove 17b are: It becomes easy to move away from the second region 17 and away from the second groove 17a in the protruding portion 21. Therefore, similarly to the drill 1 shown in FIG. 9, the area of the part which the chip
- FIG. 10 is a first modified example of the drill 1 of the embodiment shown in FIG. 1, and is a developed view of the first modified example corresponding to the developed view shown in FIG. 9 and 10, the left side of the drawing is the front end side of the drill 1, and the right side of the drawing is the rear end side of the drill 1. Further, the direction from the bottom to the top of the drawing is the rotation direction Y.
- the ridge portion 21 in the present embodiment is configured as a convex portion formed in the boundary portion between the concave second groove 17a and the concave third groove 17b in the cross section orthogonal to the rotation axis X.
- the convex strip portion 21 is configured by a convex curve-shaped portion formed between the concave second groove 17 a and the concave third groove 17 b.
- FIG. 11 is a second modification of the drill 1 of the embodiment shown in FIG. 1, and is a cross-sectional view of the second modification corresponding to the enlarged cross-sectional view shown in FIG.
- the ridge portion 21 has a pointed shape formed by the intersection of the second groove 17a and the third groove 17b.
- the chips flowing through the second groove 17a are separated from the third groove 17b. It is easy to reduce the area in contact with the surface of the third groove 17b.
- the depth V of the discharge groove 7 can be set to about 10 to 40% with respect to the outer diameter of the cutting part 11.
- the depth V of the discharge groove 7 is a value obtained by subtracting the distance between the bottom of the discharge groove 7 and the rotation axis X from the radius of the main body 3 in a cross section orthogonal to the rotation axis X as shown in FIG. Means.
- the bottom means a portion closest to the rotation axis X in the discharge groove 7.
- the diameter of the core thickness (web thickness) indicated by the diameter of the inscribed circle in the cross section orthogonal to the rotation axis X in the main body 3 is set to about 20 to 80% with respect to the outer diameter of the cutting portion 11.
- the depth V of the discharge groove 7 can be set to about 2 to 8 mm.
- the depth V2 of the third groove 17b is shallower than the depth V1 of the second groove 17a. .
- a large core thickness can be ensured while allowing play between the chips and the third groove 17b. Therefore, it can be set as the drill 1 which made compatible good chip discharge
- the depth in the first region 15 and the second groove 17a is the same. If the depths of the first region 15 and the second groove 17a through which the chips flow are not the same, and the depth of the discharge groove 7 changes in these regions, the flow of the chips at the portion where the depth becomes shallower. It becomes easy to stay. However, since the depths of the first region 15 and the second groove 17a are the same, it is possible to stabilize the chip flow while increasing the core thickness on the rear end side of the cutting portion 11.
- the depth of the first region 15 in the discharge groove 7 is constant from the front end side toward the rear end side. Note that the constant depth of the first region 15 does not mean that the depth is strictly constant from the front end side toward the rear end side.
- the depth of the first region 15 may have a variation of about 5%.
- FIG. 6 illustrates the depth of the first region 15.
- FIG. 7 illustrates the depths of the second groove 17a and the third groove 17b.
- the length of the second region 17 in the direction parallel to the rotation axis X is longer than the length of the first region 15 in the direction parallel to the rotation axis X.
- a load accompanying the cutting process is applied to the drill 1 and the cutting part 11 may bend.
- the central portion of the cutting portion 11 is easily bent more greatly than the front end portion and the rear end portion.
- the length in the direction parallel to the rotation axis X of the second region 17 having a relatively small torsion angle and high rigidity is ensured relatively long compared to the first region 15, The durability with respect to the bending of the cutting part 11 can be made favorable.
- the length of the first region 15 in the direction parallel to the rotation axis X is 10 to 20% of the length of the entire discharge groove 7 in the direction parallel to the rotation axis X. Is set to about.
- the length of the second region 17 in the direction parallel to the rotation axis X is set to about 60 to 80% of the length of the entire discharge groove 7 in the direction parallel to the rotation axis X.
- the discharge groove 7 in the present embodiment has a connection region 19. Therefore, the sum of the lengths of the first region 15 and the second region 17 does not become 100% with respect to the length in the direction parallel to the rotation axis X in the entire discharge groove 7.
- the drill 1 of the second embodiment includes a drill main body 3 (main body 3), a cutting edge 5, and a pair of discharge grooves 7, as in the drill of the first embodiment. I have.
- the difference between the drill of the second embodiment and the drill of the first embodiment will be described in detail, and the description of the points having the same configuration as the drill of the first embodiment will be omitted.
- the drill 1 of this embodiment has the 1st area
- the drill 1 according to the present embodiment is configured not by two grooves 17 but by only one groove.
- the groove width of the second region 17 is wider than the groove width of the first region 15. Therefore, while ensuring a wider region on the rear side in the rotational direction Y than the protruding portion 21 in which the chips progress in the second region 17, the front in the rotational direction Y from the convex portion 21 in the second region 17.
- the side area can also be secured. Therefore, sufficient play can be given between the area
- the ridges 21 in the drill of the present embodiment may be formed, for example, by joining the members to be the ridges 21 to the second regions 21 after forming the second regions 17, When the second region 17 is formed, the ridges 21 may be formed at the same time.
- the manufacturing method of the cut workpiece according to the present embodiment includes the following steps (1) to (4).
- This step can be performed, for example, by fixing the work material 101 on a table of a machine tool to which the drill 1 is attached and bringing the drill 1 closer in a rotated state.
- the work material 101 and the drill 1 may be relatively close to each other, and the work material 101 may be close to the drill 1.
- this step from the viewpoint of obtaining a good finished surface, it is preferable to set so that a part of the rear end side of the cutting portion of the drill 1 does not penetrate the work material 101. That is, by making this part of the area function as an area for chip discharge, it is possible to achieve excellent chip discharge through the area.
- the work material 101 and the drill 1 may be relatively separated from each other.
- the work material 101 may be separated from the drill 1.
- the drill 1 when performing the cutting of the workpiece 101 as described above a plurality of times, for example, when forming a plurality of processed holes 103 for one workpiece 101, the drill 1 is rotated. What is necessary is just to repeat the process which makes the cutting blade of the drill 1 contact the different location of the workpiece 101, hold
- the drill 1 of this invention is not limited to these, It can be made arbitrary, unless it deviates from the summary of this invention. Needless to say.
- the cutting part 11 may be a drill 1 having a configuration in which a part including the tip can be attached to and detached from a part on the rear end side, or the cutting part 11 may be a drill 1 made of one member.
Abstract
Description
第1実施形態のドリル1は、図1に示すように、ドリル本体3(以下、単に本体3ともいう)と、切刃5と、一対の第1の溝7(以下、排出溝7(flute)という。)とを備えている。
次に、一実施形態の切削加工物の製造方法について、上述の第1実施形態のドリル1を用いる場合を例に挙げて詳細に説明する。以下、図14~図16を参照しつつ説明する。なお、図14~図16において、ドリル1における把持部の後端側の部分を省略している。
3・・・ドリル本体(本体)
5・・・切刃
5a・・・主切刃
5b・・・副切刃
7・・・第1の溝(排出溝)
9・・・把持部
11・・・切削部
13a・・・クリアランス
13b・・・マージン
15・・・第1の領域
17・・・第2の領域
17a・・・第2の溝
17b・・・第3の溝
19・・・接続領域
21・・・凸条部
101・・・被削材
103・・・加工穴
θ1、θ2・・・ねじれ角
Claims (7)
- 回転軸に沿って延びた棒形状のドリル本体と、
該ドリル本体の先端に位置する切刃と、
該切刃から前記ドリル本体の後端側に向かって螺旋状に延びた第1の溝とを備え、
該第1の溝は、先端側に位置してねじれ角θ1を有する第1の領域、及び該第1の領域よりも後端側に位置して前記ねじれ角θ1よりも小さいねじれ角θ2を有する第2の領域を具備しており、
該第2の領域は、前記排出溝に沿った凸条部を有していることを特徴とするドリル。 - 前記第2の領域は、前記凸条部を境界とする第2の溝及び第3の溝を有していることを特徴とする請求項1に記載のドリル。
- 前記回転軸に直交する断面において、前記第3の溝の深さは、前記第2の溝の深さよりも浅いことを特徴とする請求項1又は2に記載のドリル。
- 前記第1の領域と第2の溝とにおける深さが同じであることを特徴とする請求項1~3のいずれか1つに記載のドリル。
- 前記回転軸に直交する断面において、前記第2の溝及び前記第3の溝は、それぞれ凹曲線形状であることを特徴とする請求項1~4のいずれか1つに記載のドリル。
- 前記回転軸に直交する断面において、前記第2の溝及び前記第3の溝は、前記凸条部を基に線対称であることを特徴とする請求項5に記載のドリル。
- 請求項1~6のいずれか1つに記載のドリルを前記回転軸の周りに回転させる工程と、
回転している前記ドリルの前記切刃を被削材に接触させる工程と、
前記ドリルを前記被削材から離す工程とを備えた切削加工物の製造方法。
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US15/528,179 US10518336B2 (en) | 2014-11-21 | 2015-11-13 | Drill and method of manufacturing machined product using the same |
DE112015005260.7T DE112015005260B4 (de) | 2014-11-21 | 2015-11-13 | Bohrer und Verfahren zum Herstellen eines bearbeiteten Produkts unter Verwendung desselben |
CN201580063129.XA CN107000072B (zh) | 2014-11-21 | 2015-11-13 | 钻头及使用该钻头的切削加工物的制造方法 |
JP2016560185A JP6470307B2 (ja) | 2014-11-21 | 2015-11-13 | ドリル及びそれを用いた切削加工物の製造方法 |
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USD892326S1 (en) * | 2018-01-31 | 2020-08-04 | Beijing Smtp Technology Co., Ltd. | Ultrasonic cutter head |
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DE112015005260T5 (de) | 2017-08-17 |
US10518336B2 (en) | 2019-12-31 |
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