WO1992003243A1 - Foret - Google Patents

Foret Download PDF

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Publication number
WO1992003243A1
WO1992003243A1 PCT/JP1991/001081 JP9101081W WO9203243A1 WO 1992003243 A1 WO1992003243 A1 WO 1992003243A1 JP 9101081 W JP9101081 W JP 9101081W WO 9203243 A1 WO9203243 A1 WO 9203243A1
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WO
WIPO (PCT)
Prior art keywords
drill
cutting edge
cutting edges
cutting
chip
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
Application number
PCT/JP1991/001081
Other languages
English (en)
Japanese (ja)
Inventor
Masao Kubota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1992003243A1 publication Critical patent/WO1992003243A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
    • B23B27/1625—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped by a clamping member acting almost perpendicularly on the chip-forming plane
    • B23B27/1629—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped with plate-like cutting inserts of special shape clamped by a clamping member acting almost perpendicularly on the chip-forming plane in which the clamping member breaks the chips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • 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
    • B23B2200/00—Details of cutting inserts
    • B23B2200/04—Overall shape
    • B23B2200/0423—Irregular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2200/00—Details of cutting inserts
    • B23B2200/08—Rake or top surfaces
    • B23B2200/086—Rake or top surfaces with one or more grooves
    • B23B2200/088—Rake or top surfaces with one or more grooves for clamping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • 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
    • B23B2251/408—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
    • B23B2251/46—Drills having a centre free from cutting edges or with recessed 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
    • B23B2251/48—Chip breakers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/004—Adjustable elements

Definitions

  • the present invention relates to a drill for drilling, and particularly to a drill for drilling which is excellent in cutting performance and cutting precision and is applied to a wide range of industrial fields such as manufacturing of machinery and equipment, and civil engineering and construction.
  • a twist drill used as a drill for drilling has a chisel edge formed at the center of the tip surface.
  • various known singings have been made to improve the cutting performance of chisel edges, and these have contributed to the improvement of the cutting performance. Since the chisel edge, which has poor machinability, is formed at the center of the tip of the drill, the drill does not bite into inclined or irregular surfaces, and the cutting performance is not sufficiently improved.
  • a clamp drill in which a chip having a cutting edge is fixed to a chip seat of a drill body, for boring.
  • a chip and a chip are used.
  • the cap seat requires high manufacturing and assembly precision.
  • two chips are provided at the center and outer periphery of the drill tip surface, and correspond to the center and outer periphery of the hole to be drilled in the work, respectively.
  • the work part to be cut is cut with the cutting edges of both chips.
  • the cutting edge of the drill is generally asymmetrical with respect to the drill axis, and the cutting force applied to the drill is imbalanced with respect to the drill axis, especially at the beginning of drilling.
  • the drill tends to run out during drilling, and the cutting accuracy of the drill is reduced.
  • a gap that does not contribute to cutting occurs between the cutting edges of both chips in the radial direction of the drill, and accordingly, the cutting performance of the drill is reduced.
  • An object of the present invention is to provide a drill excellent in cutting performance and cutting accuracy.
  • a drill according to the present invention includes a drill extending from a corresponding one of a plurality of cutting edge vertices located at a radially intermediate portion of a drill tip surface toward a drill outer peripheral end.
  • a plurality of main cutting edges each extending radially outward, and a plurality of central cutting edges each extending radially inward from the corresponding one of the plurality of cutting edge vertices toward the drill axis. It has.
  • Each of the plurality of main cutting edges and the plurality of central cutting edges extends in the direction of the drill axis toward the apex side opposite to the cutting edge and obliquely with respect to the drill axis.
  • the plurality of cutting edge vertices are provided at the same distance from the drill axis in the drill direction and at equal angular intervals in the circumferential direction of the drill, and the drill vertices are mutually identical. It is provided at an axial position.
  • a plurality of main cutting edges diagonally extending from the plurality of cutting edge vertices to the outer peripheral edge of the drill
  • the conventional swivel drill which has a plurality of central cutting edges that extend diagonally from the top of one cutting edge to the drill axis, provides a chisel edge with poor machinability at the center of the drill tip surface. Drill cutting performance can be improved compared to drills.
  • each of the main cutting edges and the corresponding central cutting edge are connected to each other at the common cutting edge apex, the main cutting edge and the central cutting edge in the radial direction of the drill are arranged. A gap that does not contribute to the cutting does not occur between the drill and the drill, and the cutting action is performed in the entire region in the drill diameter direction from the drill center to the outer periphery of the drill. Therefore, drill cutting performance can be improved.
  • the plurality of cutting edges are provided concentrically and equiangularly with respect to the drill axis and at the same drill axis position with respect to the drill axis, so that the cutting edges of the drill are formed as a whole. Symmetrical about the axis. As a result, the cutting force applied to the drill during drilling balances with respect to the drill axis, suppressing core drift of the drill and improving drill cutting accuracy.
  • FIG. 1 is a plan view of a twist drill according to a first embodiment of the present invention, as viewed from a drill tip surface;
  • FIG. 2 is a partial front view of the drill of the first embodiment
  • FIG. 2a is a diagram showing an axial cross-sectional profile of a grindstone used for grinding the drill cutting edge of the first embodiment
  • FIG. 3 is a partial side view of the drill of the first embodiment
  • Fig. 4 is a partial front view showing a clamp drill according to a second embodiment of the present invention, in which a chip mounting surface is provided in parallel with a drill axis.
  • FIG. 5 is a partial sectional view showing the jib mechanism of the drill of the second embodiment, taken along line V--V in FIG.
  • FIG. 6 is a partial cross-sectional plan view of the drill of the second embodiment, as viewed from the tip of the drill.
  • FIG. 7 is a partial cross-sectional partial front view showing in detail the arrangement of two chips in the drill of the second embodiment
  • FIG. 8 is a partial cross-sectional partial side view showing a modification of the chip arrangement
  • FIG. 9 is a partial perspective view showing another modification of the chip placement
  • FIG. 10 is a partial cross-sectional partial side view showing a modification of the drill fixing mechanism of the drill of the second embodiment.
  • FIG. 11 is a partial cross-sectional partial side view showing a modification of the drill of the second embodiment in which the chip mounting surface is inclined with respect to the drill axis.
  • FIG. 12 is a plan view of a three-blade brazing straight drill according to a third embodiment of the present invention, as viewed from the front end face of the drill.
  • FIG. 13 is a third embodiment of the present invention. Front view showing the tread of the drill, and
  • FIG. 14 is a partial side view of the drill of the third embodiment.
  • the tip face of the twist drill has first and second main cutting edges 1 and 2 for cutting a work portion corresponding to an outer peripheral portion of a hole to be drilled in a work (not shown). 2 and first and second central cutting edges 3 and 4 for cutting a work portion corresponding to the center of the hole.
  • broken lines AE and BF represent the main cutting edges AC and DF of the conventional twisted drill
  • broken lines AB represent the chisel edge of the conventional drill.
  • the first main cutting edge 1 extends obliquely outward in the drill radial direction from the vertex E of the first cutting edge located at the intermediate portion in the drill radial direction to the outer peripheral end C of the drill, and extends outward in the drill radial direction. The more to the side, the more it recedes from the first cutting edge vertex E in the drill rotation direction (No.
  • the first main cutting edge 1 is drilled in the drill axis line (tool center line) 00 so that the outer side in the radial direction of the drill is retracted from the first cutting edge vertex E toward the drill. It extends obliquely about axis 00 (Fig. 2).
  • the first main cutting edge 1 is formed so that the outer peripheral cutting edge angle ⁇ is an acute angle so as to suppress the generation of burrs on the work surface.
  • the second main cutting edge 2 extends obliquely outward in the drill radius direction from the second cutting edge vertex F in the middle part of the drill to the drill outer end D. At the same time, it extends obliquely with respect to the drill axis 00 in the drill axis direction.
  • the first and second cutting edge vertices E and F are symmetrical to each other with respect to the drill axis 00, and the positions of the drill axes in the axial direction are relative to each other. They are identical, and when the drill is lowered vertically to the work surface, both cutting edge vertices come into contact with the work surface at the same time.
  • Reference numeral 11, 21 denotes the flank associated with each of the first and second main cutting edges 1, 2, and the symbol 0 denotes the half apex angle of each of the main cutting edges 1, 2.
  • the first center cutting edge 3 is drilled from the first cutting edge vertex E, which is common to the first main cutting edge 1 and the first center cutting edge 3, to the center point Q of the drill tip surface on the drill axis. It extends diagonally inward in the radial direction, and recedes from the center point Q of the drill tip surface in the drill rotation direction toward the outer side in the half-drill direction ( Figure 1).
  • the first central cutting edge 3 is set such that, in the drill axis direction, the inner side in the drill radius direction retreats from the first cutting edge apex E toward the inside.
  • the scooping surface 30 associated with the first central cutting edge 3 is determined by the central cutting edge 3 (EQ) and the drill axis 00, and the scooping angle of the first central cutting edge 3 is 0 °. .
  • the flank 31 of the first central cutting edge 3 is formed by cutting an extension of the flank 11 associated with the first main cutting edge 1.
  • the symbol ⁇ represents the clearance angle of the first central cutting edge 3 at a right angle.
  • the second center cutting edge 4 is continuous with the second main cutting edge 2 at the second cutting edge vertex F, and the center point of the drill tip surface from the second cutting edge vertex F It extends obliquely toward Q and continues to the first central cutting edge 3 at the center point Q.
  • Reference numerals 40 and 41 refer to the second central cutting edge 4.
  • a series of scooping surfaces and flank surfaces are shown respectively.
  • a part of the scooping surfaces 30 and 40 is removed within a range permitted by the strength of the cutting edge (the scooping surface 30 is indicated by a one-point line 301 in FIG. 2).
  • the positive scooping angle is given to at least a part of both scooping surfaces to improve the cutting ability of the center cutting edges 3 and 4.
  • the cutting edges apex E and F and the cutting edges in the vicinity thereof The edge may be rounded or chamfered to increase cutting edge strength.
  • the angle between each of the central cutting edges 3 and 4 and an imaginary line extending parallel to the drill axis 00 through cutting edge apex E or F (Fig. 2) is half of that of main cutting edges 1 and 2. It is set to a value approximately equal to the apex angle ⁇ so that the cutting resistance for the main cutting edge and the cutting resistance for the central cutting edge are balanced.
  • the angle may be determined by theoretical calculation and experiment in consideration of the scooping angle and cutting speed at each part of the drill, in order to further balance the cutting resistance.
  • the contour of the axial section is 90.
  • a scooping surface 30 and a flank 41 are simultaneously formed on a drill using a forming whetstone represented by a polygonal line 34 (indicated by a two-dot chain line in FIG. 2a) forming an angle of + ⁇ .
  • the scooping surface 40 and the flank 31 are simultaneously formed by using the above-mentioned forming whetstone.
  • the central cutting edge forming portion of the drill is lightly honed using a conical grindstone to prepare the cutting edges of the central cutting edges 3 and 4.
  • the drill when the drill is lowered onto the workpiece without rotating the drill, one of the first and second cutting edge vertices E and F of the drill is cut. Or both dig into the work surface.
  • the cutting edge region including the cutting edge vertices E and F is provided at the middle part in the radial direction of the drill tip surface where a considerable cutting speed and cutting force is generated, and is formed in a V-shaped longitudinal section. It has excellent machinability and good workability. For this reason, the center of the drill tip where no cutting force is generated comes into contact with the workpiece first, and a chisel edge with poor cutting properties is formed in that part, so that the workpiece is not eroded.
  • the drill is sent at a considerable feed speed immediately after the drill tip touches a click. be able to. Also, since the tip of the drill to the work is good in this way, even if the drill is lowered diagonally to the work surface, the drill tip can escape. Absent.
  • the radially inner side of the main cutting edges 1 and 2 and the radially outer side of the central cutting edges 3 and 4 begin to contribute to the cutting.
  • the drill is sent obliquely to the work surface, initially, the cutting edges 1 and 3 on the first cutting edge vertex E side and the cutting edges 2 and 4 on the second cutting edge vertex F side Exchange
  • the work surfaces are cut with each other, and an arc-shaped groove with a V-shaped cross section is formed on the work surface.
  • all of the cutting edges 1 to 4 always contribute to the cutting, leading to the formation of a V-shaped annular groove in the work surface of the workpiece.
  • cutting edges 1 to 4 contribute to the cutting from the beginning, and an annular groove is formed in the work.
  • the drill of this embodiment has a feature that the axial length of the lip portion is shorter than that of the conventional drill, and the drill is fed from the beginning when the drill tip bites into the work. Combined with the above-mentioned feature of being able to increase the speed, substantial drilling is started within a short time after the drill drills into the work.
  • Drilling is excellent due to the cutting edges 1 to 4 that include the central cutting edges 3 and 4 that are more machinable than conventional chisel edges and are formed continuously over the entire drill diameter. It is performed efficiently with the cutting ability. Moreover, since the cutting edges 1 and 3 on the first cutting edge vertex E side and the cutting edges 2 and 4 on the second cutting edge vertex F side are formed symmetrically with respect to the drill axis 00, the cutting edge 1 , 3 and the cutting forces received by the cutting edges 2 and 4 are well balanced, and the drilling edge is stabilized and the thrust acting on the drill in the radial direction of the drill is added. G Is small.
  • the centering of the drill during drilling is suppressed, the margin for hole enlargement is small, and drilling accuracy and hole straightness are excellent. Also, cutting power can be reduced. Furthermore, the chips by the cutting edges 1 to 4 are separated from each other, so that the chips flow smoothly and the chip processing is easy.
  • the clamp drill is composed of first and second throw-away chips 100 and 200 having the same shape and dimensions as each other, and a drill body having a tip seat surface formed at a tip. 300 and two tapered jib mechanisms for compensating manufacturing errors of inserts and tip seats and adjusting machining holes (the jib mechanism corresponding to the first chip is denoted by reference numeral 90). And
  • the first chip 100 is formed in a substantially hexagonal thick plate shape as viewed from the front.
  • the main cutting edge 51 to 53 and the central cutting edge 61 to 6 respectively corresponding to the first main cutting edge 1 and the first central cutting edge 3 of the first embodiment are provided on the outer peripheral end face of the chip 100. 3 is formed.
  • the first chip 100 has its inner side surface and inner end surface abutting against the chip mounting bottom surface 101 and the inclined chip mounting surface 03 of the drill body 300, respectively.
  • the bottom surface thereof is in contact with the upper surface of the jib 91 of the jib mechanism 90 which will be described in detail later, and is detachably fixed to the drill body 300 by the bolt 13. I have.
  • the tip mounting bottom surface 101 of the drill body 300 side extends parallel to a plane passing through the drill axis line 00. --Yes.
  • the upper surface of the jib 91 cooperates with the chip seat surface of the drill body to constitute a chip seat on which the first chip 100 is placed.
  • the bolt 13 is inserted through a hole formed through the chip 100 and extending in the chip thickness direction, and is screwed into a screw hole formed in the drill body 300. I have.
  • the protector 12 fixed to the drill body 300 together with the chip 100 is arranged on the outer side of the chip to prevent chip damage due to chips. I have.
  • the tip 100 When the tip 100 is mounted in the position shown in Fig. 4, the main cutting edge 51 and the central cutting edge 61 are arranged at the drilling positions, and the other cutting edges 52, 53, 62 and 6 3 is placed in the standby position. That is, the chip 100 is used for drilling any one of the three sets of cutting edges 51, 61 or 52, 62 or 53, 63, and the remaining two sets. Cutting edges are not damaged during drilling.
  • the inner end face of the first chip 100 (the flank 53 0 associated with the main cutting edge 52) is inclined by the inclined tip of the drill body 300. It is in contact with the seat surface 0 3.
  • the main cutting edge 51 extends obliquely from the cutting edge vertex L to the drill outer peripheral end U
  • the central cutting edge 61 extends from the cutting edge vertex L to the drill axis 0 0. It extends obliquely to the point W in Fig. 4 via the vicinity of the upper center point P, and forms an angle ⁇ (preferably 70 to 75) with the drill axis 0 0.
  • the axial clearance angle ⁇ of the flank associated with the central cutting edge 62 following the margin 62 at the drill outer edge U is preferably --
  • the middle cutting edge 6 1 forms an angle (0 + ⁇ + 6 °) ° with the main cutting edge 51.
  • the symbols ⁇ , ⁇ and V, W respectively indicate the point on the standby cutting edge, which constitutes the cutting edge apex and the outer peripheral edge of the drill, when the standby cutting edge is arranged at the drilling position.
  • the symbols G, ⁇ , and ⁇ represent the intersections between the extension lines of the main cutting edges 51 to 53.
  • the symbols ⁇ and ⁇ are virtual intersections between the central cutting edge 61 and the drill axis 00 in a state where the chips 100 and 200 interfere with each other. And the virtual intersection between the main cutting edge 53 and the drill axis.
  • the second chip 200 has the same shape and dimensions as the first chip 100, and accordingly, the second chip 200 and the drill body 3 associated therewith.
  • the description of the configuration of 0 0 is omitted.
  • the first and second chips are provided on opposite surfaces of both chips. They are separated from each other by a very small distance ⁇ .
  • the micro-distance ⁇ 5 is set to a small value so that the unprocessed part of the work due to the micro-gap between both chips is easily broken during the drilling.
  • symbols t and 7t indicate the clearance angle of the blade tip and the scoop angle of the blade tip, respectively.
  • each force facing the chip faces downward with a slight degree of effect ⁇ of about 1 ° or less with respect to the force S drill axis 00.
  • the first to become --The second chips 100 and 200 may be arranged, thereby preventing interference between the chips.
  • the chips are arranged so that the chip interference portion PWT sinks a small amount to P'W'T 'to avoid chip interference.
  • the clamp drill of the present embodiment has a jib mechanism 90 associated with the first chip 100.
  • the jib mechanism 90 has a taper jib 91 interposed between the jib seat surface 04 of the drill body 300 and the bottom surface of the first chip 100.
  • Reference numeral 4 extends perpendicularly to the chip mounting bottom surface 101 of the drill body and substantially perpendicular to the inclined chip mounting surface 03.
  • a screw rod 92 screwed into the screw hole formed through the jib 91 extends parallel to the jib seat surface 04, and its tip is formed near the drill axis at the tip of the drill body. It is screwed into the screw hole.
  • Nuts 93 and 94 screwed into a screw rod 92 are arranged outside the outer end face and inside the inner end face of the jib 91, and the jib 91 is used with both nuts. It can be fixed to any jib moving position along the screw rod 92.
  • the jib mechanism (not shown) for fixing the second chip 200 to the drill body 300 and the configuration of the related drill body are the same as those of the jib mechanism 91 described above. Is omitted.
  • the jib mechanism is not an essential element. When the jib mechanism is removed, the three main cutting edges of the first and second chips 100 and 200 and the scooping surface of each of the three center cutting edges 61 to 63 3 Tip mounting of flank and drill body 300 --Process the surface with high accuracy. '
  • FIG. 10 shows a modification of the chip fixing mechanism in the clamp drill of the second embodiment.
  • the drill body 3 in the modification of FIG. The clamp 14 holding the chip 100 between it and 0 0 is tightened to the drill body side with a screw 15 so that the chip 100 is clamped. .
  • chip 200 is clamped.
  • the presser foot 14 are suitably determined in consideration of the fact that the presser foot functions as a protector and a chip breaker.
  • the drill of the modified example shown in FIG. The point where the tip mounting surface 101 is inclined with respect to the drill axis 0 0 as compared with the second embodiment in which the mounting base 101 extends parallel to the plane passing through the drill axis 00.
  • This variant has the advantage of being practical.
  • Each of the chips 100 and 200 is disposed so as to be downward with respect to the drill axis 0 0 by an angle equal to the blade tip scooping angle 7 t, and the scooping surface 102 is a chip. Extending parallel to the mounting surface 101.
  • a portion of the chip protruding beyond the drill axis line 00 toward the other chip side and a similar protruding portion of the other chip do not interfere with each other.
  • FIG. 11 shows still another modification of the second embodiment.
  • This modified example is similar to the modified example of FIG. 10 in that the tip mounting surface 101 is inclined with respect to the drill axis line 0 0, while the tip has a clearance angle at the tip of the blade. It differs from the one in Fig. 10 in that it is arranged upward with respect to the drill axis by an angle equal to at and that the flank of the main cutting edge is provided perpendicular to the chip mounting surface 101.
  • the clamp drill of this modified example in which the flank is provided perpendicular to the chip mounting surface, has an advantage that accuracy can be easily obtained.
  • the flank associated with the main cutting edge is -It is necessary to provide an appropriate clearance angle to the cutting edge so as not to interfere with the cutting edge.
  • the three-blade drill of the present embodiment has three tips attached to the drill body.
  • the first chip has a main cutting edge 71, a central cutting edge 81 reaching the drill axis 00, and an outer cutting edge 7110. Are formed, and the scooping surface associated with the outer peripheral cutting edge 710 is formed so as to form an acute angle with the outer periphery of the drill.
  • the second chip has a main cutting edge 72, a central cutting edge 82 that does not reach the drill axis 0 0, and an outer peripheral cutting edge similar to the outer peripheral cutting edge 7 10 of the first chip. 7 20 are formed.
  • the third chip has a main cutting edge 71, a central cutting edge 82, and an outer peripheral cutting edge 730 similar to the cutting edges 71, 81, 71 of the second chip. ing. As shown in Fig. 14, each chip is fixed downward to the drill axis 00 by an angle equal to the blade tip scooping angle ⁇ t, and the scooping surface is the chip mounting surface. It extends in parallel with.
  • the center of the workpiece is cut with a sharp cutting edge where the cutting edges are equidistant from the tool center axis.
  • the drill is easy to cut, and the cutting power and thrust are low. small.
  • the cutting edge at the center of the tool which has no cutting ability, has a poor cutting edge on the work, and the feed may need to be slowed down.
  • the drill of the present invention since the drill of the present invention has a reliable cutting ability at the tool tip, it has good bite to the work, and can drill holes with high efficiency without adjusting the feed.
  • Re-grinding of the central cutting edge which has a low cutting speed and low wear, may be performed every several re-grinding of the main cutting edge. Therefore, the need for drill re-polishing is eliminated.
  • the clamp drill of the present invention has no cutting edge missing part, and the entire drill tip exerts a cutting action. Therefore, the clamp drill of the present invention has a high cutting efficiency and can perform drilling in a short time.
  • the blade angle ⁇ at the outer periphery of the drill is made acute, so that burrs on the workpiece surface can be suppressed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

Un foret servant à percer un trou est très performant et précis et comporte: des bords tranchants principaux (1, 2) s'étendant radialement vers l'extérieur du foret à partir des sommets (E, F) de bords tranchants qui sont symétriques l'un par rapport à l'autre et par rapport à l'axe (00) du foret dans la partie radialement intermédiaire de la face terminale avant du foret en direction des extrémités périphériques externes (C, D) de celui-ci; ainsi que des bords tranchants centraux (3, 4) s'étendant radialement vers l'intérieur du foret à partir des sommets (E, F) des bords tranchants et en direction d'un point central (Q) de la face terminale avant du foret sur l'axe (00) de celui-ci. Les bords tranchants principaux (1, 2) et centraux (3, 4) s'étendent jusqu'aux côtés opposés aux sommets des bords tranchants dans le sens axial du foret et de manière oblique par rapport à l'axe de ce dernier. Pendant la formation du trou, aucune excentricité du foret ne se produit, et les bords tranchants principaux remplaçant les arêtes transversales traditionnelles peuvent, avec grande efficacité et précision, couper les parties voulues d'une pièce, lesquelles correspondent aux parties périphérique et centrale du trou.
PCT/JP1991/001081 1990-08-15 1991-08-14 Foret Ceased WO1992003243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2/214314 1990-08-15
JP2214314A JPH04101708A (ja) 1990-08-15 1990-08-15 ドリル

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Publication Number Publication Date
WO1992003243A1 true WO1992003243A1 (fr) 1992-03-05

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PCT/JP1991/001081 Ceased WO1992003243A1 (fr) 1990-08-15 1991-08-14 Foret

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WO (1) WO1992003243A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995029783A1 (fr) * 1994-05-03 1995-11-09 Johne & Co. Präzisionswerkzeuge GmbH Outil de perçage
CN104191000A (zh) * 2014-09-28 2014-12-10 江西杰浩硬质合金工具有限公司 一种错齿结构的四刃扩孔钻
US20150266108A1 (en) * 2012-09-28 2015-09-24 Kyocera Corporation Drill and method for manufacturing cut workpieces using same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5516242A (en) * 1994-03-24 1996-05-14 Andronica; Randall Cutting tool and shank
JP6127341B2 (ja) * 2013-03-01 2017-05-17 住友電工ハードメタル株式会社 ３枚刃ツイストドリル
JP6235737B2 (ja) * 2015-08-27 2017-11-22 株式会社ビック・ツール ３枚刃ドリル

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPS5964212A (ja) * 1982-09-14 1984-04-12 アンドレ−アス・マイエル 多刃先ドリル
JPS61270011A (ja) * 1985-05-27 1986-11-29 Mitsubishi Metal Corp ２枚刃のスロ−アウエイ式ドリル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964212A (ja) * 1982-09-14 1984-04-12 アンドレ−アス・マイエル 多刃先ドリル
JPS61270011A (ja) * 1985-05-27 1986-11-29 Mitsubishi Metal Corp ２枚刃のスロ−アウエイ式ドリル

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995029783A1 (fr) * 1994-05-03 1995-11-09 Johne & Co. Präzisionswerkzeuge GmbH Outil de perçage
US20150266108A1 (en) * 2012-09-28 2015-09-24 Kyocera Corporation Drill and method for manufacturing cut workpieces using same
US9662718B2 (en) * 2012-09-28 2017-05-30 Kyocera Corporation Drill and method for manufacturing cut workpieces using same
CN104191000A (zh) * 2014-09-28 2014-12-10 江西杰浩硬质合金工具有限公司 一种错齿结构的四刃扩孔钻

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