WO2012053090A1 - Foret à trois lames - Google Patents

Foret à trois lames Download PDF

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Publication number
WO2012053090A1
WO2012053090A1 PCT/JP2010/068611 JP2010068611W WO2012053090A1 WO 2012053090 A1 WO2012053090 A1 WO 2012053090A1 JP 2010068611 W JP2010068611 W JP 2010068611W WO 2012053090 A1 WO2012053090 A1 WO 2012053090A1
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WO
WIPO (PCT)
Prior art keywords
drill
blade
range
diameter
axis
Prior art date
Application number
PCT/JP2010/068611
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English (en)
Japanese (ja)
Inventor
一豊 伊藤
一輝 高井
Original Assignee
オーエスジー株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by オーエスジー株式会社 filed Critical オーエスジー株式会社
Priority to PCT/JP2010/068611 priority Critical patent/WO2012053090A1/fr
Publication of WO2012053090A1 publication Critical patent/WO2012053090A1/fr

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    • 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
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/20—Number of cutting edges
    • B23B2251/202—Three 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
    • B23B2251/406—Flutes, i.e. chip conveying grooves of special form not otherwise provided for

Definitions

  • the present invention relates to a three-blade drill in which three twist grooves are provided around a drill axis and three main cutting edges are provided corresponding to each twist groove, and particularly, high-efficiency machining by high feed is performed. It relates to improvements to make it possible.
  • a three-flute drill in which three torsion grooves are provided around the drill axis O, and the main cutting edges are formed along the respective torsion grooves at portions where the torsion grooves open at the tip of the drill, is used for drilling. It is known as one form of a rotary cutting tool. For example, this is the drill described in Patent Document 1.
  • the negative angle part in the range of the radial rake angle ⁇ as viewed from the drill tip side in the range of ⁇ 20 ° ⁇ ⁇ ⁇ 0 ° is provided within the range of 0.1 D or less with respect to the drill diameter D from the outer corner.
  • the portion of the main cutting edge closer to the drill axis than the negative angle portion has a concave arc shape that is smoothly dented to the opposite side of the drill rotation direction in bottom view. High-efficiency machining is possible by high feed such that the feed amount per rotation exceeds 5% of the drill diameter D.
  • the chips are not sufficiently divided, and the chips are connected for a long time, so that the twisted grooves are clogged with chips, and processing is difficult, or the durability of the drill is affected. There was a fear.
  • relatively viscous work materials such as carbon steel materials such as S25C (JIS G 4051) and rolled steel materials such as SS400 (JIS G 3101)
  • the feed rate per rotation is relative to the drill diameter D.
  • This tendency is remarkable when high-efficiency machining with high feed exceeding 0.05 D (5% of D) is performed.
  • the development of a 3-flute drill that realizes good machining by suitably cutting chips is required. It was done.
  • the present invention has been made against the background of the above circumstances, and the object of the present invention is to perform cutting in high-efficiency machining with high feed such that the feed amount per revolution exceeds 5% of the drill diameter D.
  • An object of the present invention is to provide a three-blade drill that suitably separates scraps to achieve good machining.
  • the gist of the present invention is that three torsion grooves are provided around the drill axis O, and the torsion grooves are formed along the respective torsion grooves at portions where the torsion grooves open at the drill tip.
  • a three-edged drill in which a main cutting edge is formed, wherein the torsional groove is the lowest on the inner peripheral side in the cross-sectional shape with respect to the cross-sectional shape of the torsional groove in a cross section perpendicular to the axis O of the drill shaft.
  • the maximum dent W which is the maximum value of the distance between the reference line AB and the cross-sectional shape, is 3% to 3% of the drill diameter D. It is characterized by being configured to be in the range of 6%.
  • the torsional groove has an inner peripheral lowermost point A in the cross-sectional shape and a heel side end point B on the outer periphery with respect to the cross-sectional shape of the torsional groove in the cross section perpendicular to the axis O of the drill shaft.
  • the maximum dent W which is the maximum value of the distance between the reference line AB and the cross-sectional shape, is within the range of 3% to 6% of the drill diameter D. Therefore, even when machining relatively viscous work materials, it is possible to divide chips, and high-efficiency machining with high feed even for such work materials that were difficult to machine. Is possible. That is, it is possible to provide a three-blade drill that achieves good machining by suitably dividing chips in high-efficiency machining with high feed such that the feed amount per rotation exceeds 5% of the drill diameter D. it can.
  • the core thickness D2 of the three-blade drill is in the range of 20% to 50% of the drill diameter D. If it does in this way, chips can be divided suitably at the time of processing, guaranteeing sufficient endurance.
  • a thinning is provided in the vicinity of the drill axis O at the tip of the drill, and a thinning blade is provided so as to be smoothly connected to the main cutting edge.
  • the part has a negative angle part with a rake angle ⁇ in the range of ⁇ 20 ° ⁇ ⁇ ⁇ 0 ° as viewed from the bottom when viewed from the drill tip side, which is 0.1 D or less from the outer corner to the drill diameter D.
  • the portion of the main cutting edge closer to the drill axis O than the negative angle portion of the main cutting edge has a concave arc shape that is smoothly recessed toward the opposite side of the drill rotation direction in the bottom view. It is what.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.
  • the three-blade drill of the present invention high feed processing with a feed amount per revolution exceeding 5% of the drill diameter D is possible for steel, and feed per revolution for aluminum alloy. High feed processing with an amount exceeding 30% of the drill diameter D is possible. That is, it is particularly effective when the feed amount per rotation is 5% of the drill diameter D, and even when used at a high feed rate exceeding 10%, but the feed amount per rotation is 5% of the drill diameter D. It is also possible to use it for a normal drilling process that is less than 1. In addition, by improving the chip breaking property, it is effective for deep hole machining of about 10D with respect to the drill diameter D. In addition, drilling of various work materials such as drilling of cast iron and general steel, which require relatively high rigidity, and drilling of aluminum alloy, etc., which has relatively poor chip discharge performance.
  • the three-blade drill of the invention is preferably used.
  • the twist groove is preferably twisted in the same direction as the drill rotation direction when viewed from the shank side, and is provided to discharge chips to the shank side, and the twist angle is in the range of about 10 ° to 50 °, for example. Is set as appropriate.
  • various tool materials such as cemented carbide and high-speed tool steel can be used, and a hard coating such as TiAlN, TiCN, TiN, and diamond is coated as necessary. It is also possible to provide a fluid supply hole (oil hole) that passes through in the axial direction and opens to the flank at the tip.
  • the maximum dent amount W which is the maximum value in the distance between the reference line AB and the cross-sectional shape, is less than 3%, chips are clogged in the torsion groove, the load increases, and machining is difficult. The trouble that becomes.
  • the maximum dent W is larger than 6%, there is a risk of breakage due to a problem in durability due to insufficient rigidity of the tool.
  • the maximum dent W can be cut even when machining relatively viscous work materials. Therefore, it is possible to perform high-efficiency machining by high feed even for such a work material that has been difficult to achieve.
  • the core thickness D2 of the three-blade drill is less than 20% of the drill diameter D, that is, less than 0.2D
  • the maximum dent amount W related to the torsion groove is 3% to 6% of the drill diameter D which is the preferred range. It is difficult to make it within the range, and as a result, the twisted groove is clogged with chips, increasing the load and causing a problem that machining becomes difficult.
  • the core thickness D2 of the three-blade drill is preferably in the range of 20% to 50% of the drill diameter D, and more preferably in the range of 25% to 45% of the drill diameter D. It is configured to be inside.
  • the core thickness D2 may be constant over the entire length of the drill body provided with the twist groove, but it is also possible to provide a back taper that decreases from the drill tip toward the shank side. .
  • the negative angle portion has a rake angle ⁇ in the radial direction as viewed from the drill tip side in a range of ⁇ 20 ° ⁇ ⁇ ⁇ 0 °.
  • the radial rake angle ⁇ is, for example, substantially constant in the negative angle range L, and the main cutting edge may be substantially linear in a bottom view, but the diameter increases toward the inner side (tip side) from the outer peripheral corner.
  • the main cutting edge may have a shape curved in a convex shape toward the drill rotation direction so that the direction rake angle ⁇ gradually increases (increases gradually from a negative angle to 0 °).
  • the negative angle range L is a linear distance in the direction from the outer corner to the drill axis O.
  • the main cutting edge preferably has a concave arc shape that is smoothly recessed toward the opposite side of the drill rotation direction in the bottom view at the portion closer to the drill axis O than the negative angle portion.
  • the shape radius is preferably in the range of about 0.19D to 1.1D, for example.
  • the arc does not necessarily have a constant radius, and may have a shape corresponding to a curve whose curvature changes continuously.
  • the concave arcuate portion has a positive radial rake angle ⁇ at the outer peripheral portion connected to the negative angle portion, but gradually decreases toward the drill axis O (from positive angle to 0 °).
  • the inner peripheral side portion connected to the thinning blade is negative.
  • the ratio (land / groove ratio) ⁇ 1 : ⁇ 2 of the land width angle ⁇ 1 around the drill axis O and the groove width angle ⁇ 2 of the twisted groove is preferably 35: The range is from 65 to 65:35.
  • the ratio of the groove width angle ⁇ 2 is larger than the land / groove ratio ⁇ 1 : ⁇ 2 of 35:65, the land width angle ⁇ 1 is decreased and the durability and cutting edge strength of the tool are impaired.
  • the ratio of the groove width angle ⁇ 2 is smaller than the land / groove ratio ⁇ 1 : ⁇ 2 of 65:35, the chip discharging performance may be impaired.
  • the twisted grooves are provided, for example, at equiangular intervals around the drill axis O, but can also be provided at unequal intervals. Even in this case, all land / groove ratios ⁇ 1 : ⁇ 2 are 35: 65 ⁇ It is desirable to configure so that it falls within the range of 65:35.
  • the axial rake angle of the thinning blade is preferably in the range of ⁇ 5 ° to 0 ° at the portion closest to the drill axis O, but 0 ° to + 15 ° at the connection with the main cutting edge. It is configured to increase smoothly and continuously as it goes from the drill axis O side to the connecting portion side so as to be within the range of.
  • the rake angle in the axial direction of the portion closest to the drill axis O of the thinning blade is smaller than ⁇ 5 ° (large toward the negative side), cutting resistance and thrust resistance are increased.
  • the axial rake angle is larger than 0 °, that is, a positive angle, the blade edge strength may be impaired.
  • the range of ⁇ 5 ° to 0 ° is desirable.
  • the angle is less than 0 °, that is, a negative angle
  • the cutting resistance increases at the connecting portion with the main cutting edge.
  • the angle exceeds + 15 °
  • the strength of the cutting edge may be impaired, so the range of 0 ° to + 15 °.
  • the inside is desirable.
  • the rake angle of the thinning blade does not necessarily have to be configured to increase smoothly and continuously from the drill axis O side toward the connecting portion side as described above, and takes a constant value. There may be.
  • FIG. 1 is a view schematically showing a three-blade drill 10 which is an embodiment of the present invention, and is a front view seen from a direction perpendicular to the axis O.
  • the three-blade drill 10 of the present embodiment is a three-blade twist drill integrally formed of, for example, a cemented carbide that is a superhard tool material, and is held by a main shaft.
  • the shank 12 to be rotationally driven, the shaft portion 14, and the tip portion 16 are provided coaxially in the axial direction.
  • each part in the three-blade drill 10 of the present embodiment are such that the drill diameter (tool diameter) D is about 10 (mm ⁇ ), the diameter of the shaft portion 14 is about 9.85 (mm ⁇ ), and the shaft of the shank 12 is, for example.
  • the directional dimension is, for example, about 60 (mm)
  • the axial dimension of the drill body (shaft portion 14 and tip portion 16) is, for example, about 128 (mm)
  • the overall length of the drill is, for example, about 188 (mm).
  • the surfaces of the shaft portion 14 and the tip portion 16 are coated with a hard coating having a multilayer structure such as TiAlN.
  • the shaft portion 14 and the tip portion 16 are provided with three twisted grooves 18 in a spiral shape at equiangular intervals clockwise around the drill axis O, and these twisted grooves 18 are opened at the tip of the drill in the tip portion 16.
  • Main cutting edges 20 are formed along the respective twist grooves 18 in the portions to be formed.
  • FIG. 2 is a front view showing the tip 16 of the three-blade drill 10 in an enlarged manner from the direction indicated by the arrow II in FIG.
  • FIG. 3 is a bottom view showing the distal end portion 16 of the three-blade drill 10 in an enlarged manner from the direction indicated by the arrow III in FIG. 1, that is, from the distal end side.
  • the torsion groove 18 is, for example, 10 ° in the same direction as the drill rotation direction (clockwise direction in this embodiment) when viewed from the shank 12 side, that is, from above in FIG. It is twisted at a predetermined twist angle (for example, about 30 °) within a range of about ⁇ 50 °, and chips are discharged to the shank 12 side during processing.
  • a predetermined twist angle for example, about 30 °
  • the three-blade drill 10 is provided with a plurality of (three in this embodiment) fluid supply holes (three in this embodiment) that pass through in the axial direction from the rear end of the shank 12 and open to the flank. Oil hole) 22 is provided.
  • a thinning 24 is applied corresponding to each of the three main cutting edges 20.
  • a thinning blade 26 is provided so as to be connected smoothly.
  • the thinning blade 26 is preferably connected to the main cutting edge 20 so that the rake angle in the axial direction is within the range of ⁇ 5 ° to 0 ° at the portion closest to the drill axis O.
  • the portion is configured to be within a range of 0 ° to + 15 °, and the axial rake angle increases smoothly and continuously from the drill axis O side toward the connecting portion side ( Configured to be gradually increased from a negative angle to a positive angle).
  • the rake angle of the thinning blade does not necessarily have to be configured to increase smoothly and continuously from the drill axis O side toward the connecting portion side as described above, and takes a constant value. There may be.
  • the outer peripheral portion of the main cutting edge 20 is provided with a negative angle portion 28 in which the radial rake angle ⁇ is negative with respect to the bottom view seen from the drill tip side, that is, the form shown in FIG.
  • the negative angle portion 28 corresponds to a portion where the radial rake angle ⁇ in the outer peripheral portion of the main cutting edge 20 is within a range of ⁇ 20 ° ⁇ ⁇ ⁇ 0 °, and the negative angle range L is preferably
  • the linear distance in the direction from the outer corner to the drill axis O is 0.1 D or less with respect to the drill diameter D.
  • the main cutting edge 20 has a shape that projects smoothly and protrudes in the direction of drill rotation, that is, in the counterclockwise direction around the drill axis O in FIG.
  • the rake angle ⁇ in the radial direction is the smallest at the outer peripheral corner (larger toward the negative side) and gradually increases toward the drill axis O side (the drill tip side) (from the negative angle gradually increases to 0 °). Configured).
  • the radial rake angle ⁇ shown in FIG. 3 is an angle of the outermost outer peripheral corner portion. In the three-edged drill 10, the radial rake angle ⁇ of this portion is preferably ⁇ 20 ° ⁇ ⁇ .
  • the predetermined angle is within a range of ⁇ 0 °.
  • the portion closer to the drill axis O than the negative angle portion 28 is a recess that is smoothly recessed in the direction opposite to the drill rotation direction in the bottom view shown in FIG. 3, that is, in the clockwise direction of the drill axis O in FIG. It is comprised so that circular arc shape may be comprised.
  • the radius of the concave arc shape is preferably within a range of 0.19D to 1.1D with respect to the drill diameter D, for example, an arc shape having a constant radius of about 0.23D.
  • the radial rake angle ⁇ is positive at the outer peripheral portion connected to the negative angle portion 28, but gradually decreases toward the drill axis O and becomes negative.
  • a predetermined negative angle is set at the inner peripheral side portion connected to H.26. Further, the boundary between the negative angle portion 28 forming a convex shape and the concave arc shape is smoothly connected by a small convex arc.
  • the core thickness D2 in the three-blade drill 10 of the present embodiment is preferably in the range of 20% to 50% of the drill diameter D, that is, in the range of 0.20D to 0.50D, and more preferably. Is in the range of 25% to 45% of the drill diameter, ie in the range of 0.25D to 0.45D.
  • the core thickness D2 may be constant over the entire length of the drill body provided with the twisted groove 18, that is, the shaft portion 14.
  • FIG. A predetermined back taper is provided such that the drill diameter decreases from the tip of the drill toward the shank 12 at the tip 16 shown. Further, the back taper is not necessarily provided, and there is no difference in diameter between the shaft portion 14 and the tip portion 16.
  • the present invention is preferably applied to a three-blade drill having no neck.
  • FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 1, and is a diagram showing a cross-section perpendicular to the shaft 14 (cross section perpendicular to the axis O of the drill shaft) in the three-blade drill 10.
  • the torsion groove 18 opened to the tip end portion 16 is continuously provided from the tip end portion 16 to the drill body, that is, the shaft portion 14.
  • the land / groove ratio ⁇ 1 : ⁇ 2 which is the ratio to the angle ⁇ 2 , is preferably in the range of 35:65 to 65:35.
  • the twist groove 18 has an inner peripheral lowermost point A and an outer periphery in the sectional shape of the twist groove 18 in a section perpendicular to the axis O of the drill shaft portion 14.
  • the maximum dent W which is the maximum value of the distance between the reference line AB and the cross-sectional shape, is in the range of 3% to 6% of the drill diameter D. In other words, it is configured to be within the range of 0.03D to 0.06D.
  • This innermost lowermost point A is the point closest to the axial center O in the twisted groove 18, in other words, the cross-sectional shape of the twisted groove 18 in the cross section perpendicular to the axial center O of the shaft portion 14.
  • FIG. 4 is an intersection (a common contact point related to the same tangent line) with a circle corresponding to the core thickness (web) D2 indicated by a broken line in FIG.
  • the heel side end point B is an end point on the heel side, that is, the side opposite to the main cutting edge 20, of the outer peripheral surface side end points of the twist groove 18.
  • FIG. 5 is a diagram showing an axial straight section (a section perpendicular to the axis O of the drill shaft portion) of the shaft portion 100 in a conventional three-blade drill for comparison with the three-blade drill 10 of the present embodiment. It is.
  • the torsion groove 102 provided in the shaft portion 100 has a cross-sectional shape of the torsion groove 102 in a cross section perpendicular to the axis O of the shaft portion 100.
  • the straight line A'B' connecting the innermost side lowest point A 'and the outer heel side end point B' in the cross-sectional shape is used as a reference line.
  • the maximum dent amount W ′ which is the maximum value in distance, is configured to be, for example, about 1% of the drill diameter D, that is, about 0.01D.
  • the core thickness D2 ' is configured to be, for example, about 25% of the drill diameter D, that is, about 0.25D.
  • test conditions were performed under the following test conditions (processing conditions).
  • “good” is the result related to the test product that was able to process 20 holes or more continuously on the work material, and other test products such as 1 to 2 holes were processed.
  • the results relating to the test specimens for which further cutting is difficult are indicated by “defects”.
  • the chips are not divided by the processing of about 1 to 2 holes but are connected as shown in FIG. 7, and the twisted grooves are clogged with chips, resulting in difficulty in processing. The result was “bad”.
  • the load is 100% or more in the processing of the second hole, and further processing is performed. The result was “bad”.
  • breakage occurs in the processing of the second hole, and further processing can be performed.
  • the result was “bad”.
  • the chips were appropriately divided as shown in FIG. 8, and the result was “good”.
  • the load is 100% or more in the processing of the second hole, and further processing is performed. The result was “bad”.
  • the maximum dent W relating to the cross-sectional shape of the torsion groove 18 falls within the range of 3% to 6% of the drill diameter D.
  • the maximum dent amount W relating to the cross-sectional shape of the twisted groove 18 is in the range of 3% to 6% of the drill diameter D.
  • the tool diameter ratios are all in the range of 0.20D to 0.50D.
  • the core thickness D2 is configured to be in the range of 20% to 50% of the drill diameter D.
  • the test product 1 and the test product 7 in which the core thickness D2 is less than 20% of the drill diameter D, that is, less than 0.2D breakage occurs due to insufficient rigidity of the tool.
  • the test product 6 and the test product 12 in which the core thickness D2 is larger than 50% of the drill diameter D, that is, larger than 0.5D the twist is caused by the chips being connected for a long time without being sufficiently divided.
  • the core thickness D2 is configured to be larger than 50% of the drill diameter D, so that the maximum dent amount W relating to the twisted groove 18 is in the range of 3% to 6% of the drill diameter D, which is the preferred range. This is probably because it is difficult to configure the inside. That is, it has become clear from the results of this test that the core thickness D2 of the three-blade drill is preferably configured to be in the range of 20% to 50% of the drill diameter D.
  • the twisted groove 18 is the innermost side lowermost point A in the cross-sectional shape with respect to the cross-sectional shape of the twisted groove 18 in the cross section perpendicular to the axis O of the shaft portion 14.
  • the maximum dent W which is the maximum value of the distance between the reference line AB and the cross-sectional shape, is 3% to 6% of the drill diameter D, with the straight line AB connecting the heel side end point B on the outer periphery as a reference line. Therefore, it is possible to divide chips even when processing a relatively viscous work material, which is difficult for conventional work materials. Even high-efficiency machining with high feed is possible.
  • the core thickness D2 is increased while ensuring a predetermined chip discharging performance as compared with the two-blade drill.
  • the rigidity can be increased, centripetality is increased and core blurring is suppressed, and the machining hole diameter enlargement margin is reduced and the machining hole accuracy is improved. That is, to provide a three-blade drill 10 that achieves good machining by suitably dividing chips in high-efficiency machining with high feed such that the feed amount per rotation exceeds 5% of the drill diameter D. Can do.
  • the core thickness D2 of the three-blade drill 10 is configured to be in the range of 0.20D to 0.50D with respect to the drill diameter D, the chip discharging performance is achieved. It is possible to ensure a good balance between the rigidity of the tool and the strength of the cutting edge, which is advantageous for high-efficiency machining with high feed.
  • the outer peripheral portion of the main cutting edge 14 is provided with a negative angle portion 28 having a negative radial rake angle ⁇ , so that the cutting edge strength in the vicinity of the outer peripheral corner is increased.
  • a negative angle portion 28 having a negative radial rake angle ⁇
  • the rake angle ⁇ in the radial direction of the negative angle portion 28 is in the range of ⁇ 20 ° ⁇ ⁇ ⁇ 0 °, and the range L of the negative angle portion 28 is set to 0.1 D or less from the outer corner. Further, an increase in cutting resistance and thrust resistance due to a negative angle, or a decrease in sharpness is suppressed to a necessary minimum, and high-efficiency machining with high feed as a whole becomes possible. Moreover, since the portion closer to the drill axis O than the negative angle portion 28 has a concave arc shape that is smoothly recessed in the direction opposite to the drill rotation direction, the curling of the chips is promoted, and it becomes easy to divide. The chip discharge performance is improved, and the cutting edge length is longer than that of the straight cutting edge and the cutting load is dispersed. This is also advantageous for high-efficiency machining with high feed.
  • the ratio between the land width angle ⁇ 1 and the groove width angle ⁇ 2 is in the range of 35:65 to 65:35. Therefore, it is possible to ensure a good balance between the chip discharge performance and the rigidity and cutting edge strength of the tool, which is advantageous for high-efficiency machining with high feed.
  • a thinning 24 is provided in the vicinity of the drill axis O of the tip portion 16, and a thinning blade 26 is provided so as to be smoothly connected to the main cutting edge 20.
  • the rake angle in the axial direction is in the range of ⁇ 5 ° to 0 ° at the portion closest to the drill axis O, but is in the range of 0 ° to + 15 ° at the connection with the main cutting edge 20.
  • the rake angle of the thinning blade does not necessarily have to be configured to increase smoothly and continuously from the drill axis O side toward the connecting portion side as described above, and takes a constant value. There may be.
  • the three-blade drill 10 of the present embodiment it is possible to divide chips even when processing a relatively high-viscosity work material.
  • high-efficiency machining with high feed is possible, and high-efficiency drilling with high feed such that the feed amount per rotation exceeds, for example, 5% or even 10% of the drill diameter D becomes possible.
  • high feed is possible in this way, the number of rotations per hole is reduced, and an improvement in tool life can be expected.
  • the three-blade drill of the present invention is provided with three twisted grooves around the drill axis O, and the main cutting edges are formed along the respective twisted grooves at portions where these twisted grooves open at the tip of the drill.
  • the torsional groove is related to the cross-sectional shape of the torsional groove in the cross section perpendicular to the axis O of the drill shaft, and the innermost side lowermost point A in the cross-sectional shape and the heel side end point on the outer periphery
  • the maximum dent W which is the maximum value of the distance between the reference line AB and the cross-sectional shape, is in the range of 3% to 6% of the drill diameter D.

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  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

L'invention porte sur un foret. Des cannelures hélicoïdales (18) sont configurées de telle sorte que, si l'on prend comme ligne de référence une ligne droite (AB) qui relie un point extrême inférieur (A) du côté périphérique intérieur à un point final (B) situé sur le côté talon sur la périphérie extérieure de la forme de section transversale des cannelures hélicoïdales (18), dans une coupe perpendiculaire à un centre de tige (O) de la section tige (14), une quantité évidée maximum (W), qui est la valeur maximum de la distance entre la ligne de référence (AB) et la forme de section transversale, se situe dans l'intervalle de 3 à 6 % du diamètre (D) du foret. Ceci permet aux copeaux d'être divisés, même dans le traitement d'un matériau à tailler qui a une viscosité relativement élevée, et permet aussi un traitement à haut rendement grâce à une haute vitesse d'avance, même relativement à un matériau à tailler dont le traitement était difficile jusqu'à présent. Plus précisément, on peut réaliser un foret à trois lames (10) capable d'exécuter un traitement excellent par la division appropriée des copeaux dans le traitement à haut rendement grâce à une grande vitesse d'avance, du fait que la distance d'avance par tour excède 5 % du diamètre de foret (D).
PCT/JP2010/068611 2010-10-21 2010-10-21 Foret à trois lames WO2012053090A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014210325A (ja) * 2013-04-19 2014-11-13 株式会社不二越 ドリル
EP2857131A4 (fr) * 2012-05-30 2016-01-27 Osg Corp Foret à 3 lames
JPWO2021153599A1 (fr) * 2020-01-30 2021-08-05

Citations (4)

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US9713846B2 (en) 2012-05-30 2017-07-25 Osg Corporation 3-blade drill
JP2014210325A (ja) * 2013-04-19 2014-11-13 株式会社不二越 ドリル
JPWO2021153599A1 (fr) * 2020-01-30 2021-08-05
WO2021153599A1 (fr) * 2020-01-30 2021-08-05 京セラ株式会社 Outil tournant et procédé de fabrication de pièces découpées
JP7344321B2 (ja) 2020-01-30 2023-09-13 京セラ株式会社 回転工具及び切削加工物の製造方法

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