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US20020159851A1 - Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill - Google Patents

Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill Download PDF

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Publication number
US20020159851A1
US20020159851A1 US10061448 US6144802A US2002159851A1 US 20020159851 A1 US20020159851 A1 US 20020159851A1 US 10061448 US10061448 US 10061448 US 6144802 A US6144802 A US 6144802A US 2002159851 A1 US2002159851 A1 US 2002159851A1
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US
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Application
Patent type
Prior art keywords
drill
shaft
insert
cutting
surface
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.)
Abandoned
Application number
US10061448
Inventor
Ulrich Krenzer
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Kennametal Inc
Original Assignee
Kennametal Inc
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

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B51/00Tools for drilling machines
    • B23B51/02Twist drills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B2251/00Details of tools for drilling machines
    • B23B2251/02Connections between shanks and removable cutting heads
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S408/00Cutting by use of rotating axially moving tool
    • Y10S408/713Tool having detachable cutting edge
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/78Tool of specific diverse material
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/89Tool or Tool with support
    • Y10T408/907Tool or Tool with support including detailed shank
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/89Tool or Tool with support
    • Y10T408/909Having peripherally spaced cutting edges
    • Y10T408/9095Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097Spiral channel
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/89Tool or Tool with support
    • Y10T408/909Having peripherally spaced cutting edges
    • Y10T408/9098Having peripherally spaced cutting edges with means to retain Tool to support
    • Y10T408/90993Screw driven means

Abstract

A twist drill, having a replaceable drill tip, comprising a drill bit shaft (1), a cutting insert (2) which is detachably fixed thereto and which forms the tip area of the twist drill, and comprises a flute (3) that continues into the cutting insert (2). The cutting insert rests, with a bearing surface (6) extending orthogonal to the center longitudinal axis (8) of the drill bit, on the face (7) of the drill bit shaft (1) and extends with a fixing stud (9), which centrally protrudes from the bearing surface (6), into a receiving recess (10) which is configured complementary thereto and which is provided in the face (7) of the drill bit shaft (1). At least one peripheral section (13) of the fixing stud (9) comprises a first longitudinal section (15) that, with a screw surface (16) which points away from the drill bit shaft (1), which slopes upward to the drill bit tip (5) in a direction of rotation of the drill bit, and which interacts with an opposite surface (19) on the inner wall (14) of the receiving recess (10), merges into a second longitudinal section (17).

Description

    CONTINUING APPLICATION DATA
  • [0001]
    This application is a continuation-in-part of International Application No. PCT/EP00/04851, filed on May 27, 2000, which claims priority from Federal Republic of Germany Application No. 199 36 579.2, filed on Aug. 3, 1999. International Application No. PCT/EP00/04851 was pending as of the filing date of this application. The United States was an elected state in International Application No. PCT/EP00/04851.
  • BACKGROUND OF THE INVENTION
  • [0002]
    1. Field of the Invention
  • [0003]
    The invention relates to a twist drill for drilling having a replaceable drill tip. This invention further relates to a replaceable drill tip for use in a twist drill
  • [0004]
    Additionally, this invention relates to a drill bit with a replaceable drill bit.
  • [0005]
    2. Background Information
  • [0006]
    The modern metalworking trade primarily uses twist drills to make borings. Depending on the application, these twist drills can differ in terms of their cutting material and geometry. The cutting material traditionally used is increasingly being replaced by different types of cutting material that have a significantly higher resistance to abrasion. For large drilling tools, however, a drill made entirely of such abrasion-resistant materials is generally too expensive, and is not economical in spite of its excellent cutting performance. Alternatives are twist drills in which a drill tip made of abrasion-resistant materials is permanently attached to a carrier tool which is generally made of cheaper, more traditional materials. The disadvantage of these tools, however, is that they can be repainted only to a restricted extent. As soon as the short cutting portion made of abrasion-resistant materials has been used up, the entire tool has to be scrapped.
  • [0007]
    To reduce overall costs and reduce or eliminate waste of material, it is advantageous to construct a drill with a replaceable cutting tip, as discussed herein. Replaceable cutting tips permit a user to replace the cutting tip when the cutting tip is worn down without having to replace the entire drill.
  • [0008]
    On a drill bit of this type, a cutting head is detachably fixed to a drill shaft. German Patent No. 196 05 157 A1 describes a drilling tool of the prior art in which the cutting head projects by means of a stud into a receiving recess on the face of the drill shaft, where it is fixed in position with a screw that is oriented at a right angle to the longitudinal axis of the drill. On a drilling tool of the prior art described in WO 98/53943, the drilling head is fixed in position in the drill shaft with a force fit that acts in the axial direction and in the direction of rotation of the drill.
  • OBJECT OF THE INVENTION
  • [0009]
    One object of the invention is to develop a twist drill for drilling having a replaceable drill tip, as well as a replaceable drill tip for use in a twist drill.
  • [0010]
    Another object of the invention is to propose a drill bit with an alternative fixing of the cutting head.
  • SUMMARY OF THE INVENTION
  • [0011]
    This object can be accomplished in a drill bit with a drill bit shaft and a cutting insert that forms the tip area of the drill bit and is detachably fixed to the drill bit shaft. There is at least one chip flute that is located in the drill bit shaft and extends into the cutting insert. The cutting insert is in contact with a bearing surface on the face of the drill shaft and extends with a fixing stud that projects centrally from the bearing surface into a receiving recess, which is configured complementary thereto in the face of the drill shaft. At least one peripheral segment of the fixing stud has a first longitudinal segment which merges with a screw surface into a second longitudinal section. The screw surface points away from the drill shaft, slopes upward in the direction of rotation of the drill bit toward the drill bit tip, and interacts with an opposite surface on the inner wall of the receiving recess.
  • [0012]
    The cutting head is in contact with a bearing surface against the face of the drill shaft, and extends by means a fixing stud that projects centrally out of the bearing surface into a complementary receiving recess in the face of the drill shaft. The peripheral area of the fixing stud that interacts with the inner wall of the recess has two longitudinal segments, namely a first longitudinal segment which, with a screw surface that points toward the drill tip, slopes upward in the direction of rotation of the drill and interacts with an opposite surface on the inner wall of the receiving recess and merges into a second longitudinal segment. When the drill head is designed in this manner, it can be easily inserted with its fixing stud into the receiving recess and fixed in position opposite to the direction of rotation of the drill. The screw surface is thereby pushed onto the opposite surface of the receiving recess and the cutting head is pressed with its bearing surface onto the face of the drill shaft. This fixing is further strengthened when the drill is in operation.
  • [0013]
    In one preferred embodiment, the second longitudinal segment of the fixing stud tapers toward its free end. The receiving recess becomes narrower by the same extent toward its base. The shaft walls that are adjacent to the receiving recess can be correspondingly thicker and more stable in this area. The tool shaft is therefore more stable with regard to a force that is exerted on the cutting head at a right angle to the longitudinal axis of the drill than would be the case with a receiving recess that becomes wider toward its base in an approximately swallowtail shape. A particularly stable mounting and centering of the fixing stud in the receiving recess is essentially guaranteed if the free end of the fixing stud is provided with a cylindrical peripheral surface and the area adjacent to it and extending to the screw surface is provided with a conical peripheral surface.
  • [0014]
    To limit the axial strain between the cutting insert and the tool shaft and to create a defined limit position for the cutting insert, in an additional embodiment of the invention, a rotation stop projects from the face of the drill shaft and extends into a complementary recess in the bearing surface of the cutting insert. The bearing surfaces of the drill shaft and the face of the tool shaft also preferably each extend at a right angle to the longitudinal axis of the drill. The screw surface can form an angle of 90° with the longitudinal axis of the drill. The screw surface is preferably oriented at an angle, however, and forms an angle which is <90° and >45°. The angle is preferably 60°. As a result of the inclined position of the screw surface, the cutting insert is pushed, in addition to the axial strain, with a force that centers it and is directed toward the center longitudinal axis of the drill.
  • [0015]
    In at least one possible embodiment of the present invention, the surfaces of the fixing stud, as well as the surfaces of the drill bit shaft that engage with the surfaces of the fixing stud, can preferably be suitably designed to withstand torque and axial forces. During drilling of an object, torque forces are exerted on a drill. In addition, axial forces may push and pull on the drill in the direction along the longitudinal axis of the drill, especially during retraction of the drill from an object being drilled. The peripheral segments of the fixing stud may therefore preferably be designed to withstand such forces since the peripheral segments may essentially perform a retaining function preferably to prevent the cutting insert from being pulled from the drill shaft during drilling. Conversely, in at least one possible embodiment of the present invention, the inner surfaces of the drill shaft may also be designed preferably to withstand the forces that are acting on the cutting insert to also substantially prevent the cutting insert from being pulled from the drill shaft. Further, since the cutting insert may essentially be screwed into place in the drill shaft in a direction opposite the direction of rotation of the drill, torque forces may be exerted on the cutting insert. According to at least one possible embodiment of the present invention, the inner surfaces of the drill shaft against which the sides of the cutting insert rest preferably must be suitably designed to essentially prevent the cutting insert from being further screwed into the shaft, which would most likely result in damage of the shaft and the insert. By strengthening the contact surfaces of the shaft and the cutting insert, the torque and axial forces can be substantially withstood to prevent damage to the drill.
  • [0016]
    In at least one other possible embodiment of the present invention, the chip flutes of the drill bit may each be divided into essentially two portions: the portion of the chip flute on the drill shaft and the portion of the chip flute on the cutting insert. When the cutting insert is screwed into the drill shaft, the two chip flute portions can be aligned to form a single chip flute surface. Although it may preferably be desirable to design the cutting insert and the drill shaft such that the chip flute portions are exactly aligned to form a chip flute that is substantially smooth and continuous, such a design may require high precision when manufacturing the cutting inserts and the drill shafts. It is well known, however, that any manufacturing process, no matter how precise, is subject to errors, tolerances and imperfections. It is therefore possible that the cutting inserts may not be precisely manufactured due to the inherent imperfections that occur during any manufacturing process. To account for such imperfections that may occur, in one possible embodiment of the present invention it may not be necessary to have precisely aligned chip flute portions. Since the chip flute portions may simply serve to remove chips, exact precision in their design may not be a requirement for proper operation of the drill. Further, the centering of the drill tip is often more important to a drilling process than the precise design of the chip flutes, since an off-center drill tip will often produce a wobbling motion of the drill during drilling, which is in many cases undesirable. The central fixing stud of the cutting insert can provide a centering function that essentially centers the drill tip along the central longitudinal axis of the drill bit. The present invention, in at least one possible embodiment, therefore teaches that as long as the drill tip of the cutting insert is designed to lie on the central longitudinal axis, it may be possible for the chip flute portions to be slightly misaligned without substantially affecting the performance of the drill.
  • [0017]
    Drills such as the type described above may be used, in at least one possible embodiment, to cut various materials, such as metals, wood, plastics, composites, polymers, steel, and other hard materials. In addition, such drills may also possibly be used in machine-operated, automatic drilling systems, such as numerically-controlled drilling systems on assembly lines. By having replaceable cutting or drilling inserts, it may be possible in at least one possible embodiment of the present invention, to substantially maintain the overall length of the drill by replacing the cutting inserts when they become worn. By substantially maintaining the length of the drill, it may not be necessary to reconfigure or reprogram the machinery using the drill in the automatic drilling process since the drill will not substantially change in length.
  • [0018]
    The above-discussed embodiments of the present invention will be described further hereinbelow. When the word “invention” is used in this specification, the word “invention” includes “inventions”, that is the plural of “invention”. By stating “invention”, the Applicant does not in any way admit that the present application does not include more than one patentably and non-obviously distinct invention, and maintains that this application may include more than one patentably and non-obviously distinct invention. The Applicant hereby asserts that the disclosure of this application may include more than one invention, and, in the event that there is more than one invention, that these inventions may be patentable and non-obvious one with respect to the other.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0019]
    The invention is explained in greater detail below with reference to the exemplary embodiments illustrated in the accompanying drawings, in which:
  • [0020]
    [0020]FIG. 1 shows the upper segment of a drill bit with three chip flutes and a corresponding three-edged cutting insert, in a side view;
  • [0021]
    [0021]FIG. 2 is a side view of the cutting insert illustrated in FIG. 1;
  • [0022]
    [0022]FIG. 3 is a plan view from overhead of the cutting insert in the direction of the arrow III in FIG. 2;
  • [0023]
    [0023]FIG. 4 is a side view of a drill shaft as illustrated in FIG. 1, with the cutting insert removed;
  • [0024]
    [0024]FIG. 5 is a plan view from overhead of the face of the tool shaft in the direction of the arrow 5 in FIG. 4;
  • [0025]
    [0025]FIG. 6 shows an additional embodiment of a cutting insert in longitudinal section;
  • [0026]
    [0026]FIG. 7 shows an additional embodiment of a cutting insert in longitudinal section;
  • [0027]
    [0027]FIG. 8 is a side view of the upper portion of a drill bit with a two-edged cutting insert;
  • [0028]
    [0028]FIG. 9 is a side view of the upper longitudinal segment of the drill with the cutting insert removed;
  • [0029]
    [0029]FIG. 10 is a plan view from overhead in the direction of the arrow X in FIG. 9;
  • [0030]
    [0030]FIG. 11 shows a two-edged cutting insert in a side view;
  • [0031]
    [0031]FIG. 12 is a plan view from overhead in the direction indicated by the arrow XII in FIG. 11; and
  • [0032]
    [0032]FIG. 13 is a view of the drill in FIG. 8 with additional features according to at least one possible embodiment of the present invention.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • [0033]
    The drill bits illustrated in the accompanying drawings are composed of a drill shaft 1 and a cutting insert 2. The cutting insert 2 a on the drill illustrated in FIGS. 1 to 5 is three-edged. Accordingly, there are a total of three chip flutes 3 in the drill shaft 1, which continue with chip flute segments 3 a into the cutting insert 2 a. The cutting insert has three major cutting edges 4 which—as can be seen in particular in the plan view from overhead in FIG. 3—are oriented in approximately a star shape and converge in the drill tip 5. The three edges of the cutting insert mean that the cutting insert, likewise shown in the plan view from overhead in FIG. 3, has approximately the shape of a trifurcated star.
  • [0034]
    The cutting insert 2 a has a flat bearing surface 6, which is in flat contact against the face 7 of the drill shaft 1. The bearing surface 6 and the face 7 extend at a right angle with respect to the center longitudinal axis 8 of the drill bit. Shaped onto the bearing surface 6 is a central fixing stud 9, which extends in the direction of the center longitudinal axis 8. When the drill bit is inserted, the fixing stud 9 lies in a complementary configured receiving recess 10 in the drill shaft 1, where it is effectively fixed by axial undercuts. The receiving recess 10 emerges into the chip flutes 3 with lateral openings 11 that extend to the face 7. When the drill bit is inserted as illustrated in FIG. 1, the cutting surface areas that form the chip flute segments 3 a and the chip flute 3 of the drill shaft 1 are aligned with one another, whereby they are interrupted only by the joint 12 between the cutting insert 2 a and the drill shaft 1.
  • [0035]
    The chip flute segments 3 a divide the fixing stud 9 into three peripheral segments 13, which interact with the inside walls 14 of the receiving recess 10. The fixing stud 9 has a first longitudinal segment 15 which merges with a screw surface 16 into a second longitudinal segment 17. The screw surface 16 points toward the drill tip 5 and projects in the manner of a radial shoulder from the peripheral segment 13. The screw surface 16 slopes upward in the direction of rotation 18 of the drill bit toward the drill tip 5 and interacts with a complementary configured opposite surface 19 on the inside walls 14 of the receiving recess 10. To essentially fix the cutting insert to the drill shaft 1, the cutting insert is inserted with the fixing stud 9 into the receiving recess 10 so that its peripheral segments 13 are located in the vicinity of the openings 11. As the result of a rotation in the direction opposite to the direction of rotation 18 of the drill bit, the screw surfaces 16 arrive below the opposite surfaces 19 on the inner walls 14, as a result of which the cutting insert is pressed in the direction indicated by the arrow 20 with its bearing surface 6 against the face 7.
  • [0036]
    The surface of the second longitudinal segment 17 that interacts with the inner walls 14 can be a partly cylindrical surface as illustrated in FIG. 6. In the exemplary embodiment illustrated in FIG. 7, the second longitudinal segment 17 tapers conically toward the drill shaft. However, special preference is given to the configuration illustrated in FIG. 2, in which adjacent to the screw surface 16 there is a conical segment 21, which merges into a cylindrical segment 22. The cylindrical segment 22 effects a centering of the cutting insert 2 a in the receiving recess 10. The diameter of the cylindrical segment 22 can be relatively small compared to the segments adjacent to it toward the tip and that have the screw surfaces 16 necessary for the axial bracing. Accordingly, the area 23 of the receiving recess 10 that interacts with the cylindrical segment 22 can also have a small inside diameter. That in turn means a greater wall thickness 24 in the area 23 and thus increased stability. Especially in the area 23 have a greater effect on account of the lever effect. However, the greater wall thickness 24 in this area guarantees increased stability of the drill shaft 1.
  • [0037]
    To further explain, the torque forces act on the cutting insert 2 a during a drilling procedure. Due to the lever effect, a large portion of the torque forces are exerted at the transition between the bearing surface 6 and the first longitudinal segment 15. Therefore, it is advantageous for the fixing stud 9 to have an increased thickness at that particular area. Further, since the majority of the torque forces are concentrated on that particular area, it is possible for the fixing stud 9 to decrease in thickness in the area of the cylindrical segment 22. In addition, by decreasing the thickness of the fixing stud 9, it is thereby possible to have an increased thickness of the shaft 1 in the area 23. As torque forces are exerted on the cutting insert 2 a, force is also exerted on the portions of the shaft 1 about the recess 10. Also due to the lever effect, the majority of the force is exerted on the area 23 near the bottom of the recess 10. By decreasing the thickness of the fixing stud 9 at the area 23, the wall thickness 24 can be consequently increased to compensate for the greater torque forces exerted in that particular area 23. The lever effect therefore can be accounted for by increasing thickness of the shaft 1 and the fixing stud 9 at the areas where the concentration of force is the greatest.
  • [0038]
    The screw surfaces 16 on the fixing stud 9 of a cutting insert 2 can basically form an angle of 90° with the center longitudinal axis 8 of the drill or of the cutting insert. However, preference is given to screw surfaces 16 that are oriented at an angle and form an angle α with the center longitudinal axis 8 which is <90° and ≧45°.
  • [0039]
    FIGS. 8 to 12 show a drill bit with two chip flutes and accordingly a two-edged cutting insert 2 b. The configuration of the fixing stud 9 and of the receiving recess 10 of this drill bit is the same as that of the drill bit described above. One difference is that two rotation stops 25 project from the face 7 a of the drill shaft 1. The rotation stops 25 are diametrically opposite each other and are realized with four surfaces in an essentially wedge shape. Their outside surface 26 is formed by the peripheral surface of the drill shaft 1. Their inside surface 27 interacts with a complementary configured opposite surface 28, which is part of the wall of a recess 29 in the bearing surface 6 of the cutting insert 2 b, which recess 29 holds the rotation stop 25. The rotation stops also have two inclined surfaces, whereby the one inclined surface 30 points in the direction of rotation 18 of the drill bit and merge into a face 7 a. The other inclined surface 31 points opposite to the direction of rotation 18 of the drill bit and is a partial surface of the face 32 that forms the chip flute 3. The inclined surface 30 interacts with an inclined surface 33 that is formed from the wall of the recess 29 and acts as an opposite bearing surface.
  • [0040]
    [0040]FIG. 13 is a view of the drill shown in FIG. 8 with additional features according to at least one possible embodiment of the present invention. The drill bit has a drill shank portion 101 that is inserted into a tool chuck 102. The tool chuck 102 holds the drill bit and provides a driving force to rotate the drill during a drilling process. The drill shown has a two-edged cutting insert design, but is not the only possible embodiment. This drill bit and chuck configuration may also be used with cutting inserts and bits with more than two edges, such as a cutting insert with three edges, as shown in FIGS. 1-3.
  • [0041]
    One feature (or aspect) of an embodiment of the invention resides broadly in a drill bit with a drill bit shaft (1) and a cutting insert that forms the tip area of the drill bit and is detachable fixed to the drill bit shaft, and at least one chip flute (3) that is located in the drill bit shaft (1) and extends into the cutting insert (2), whereby the cutting insert is in contact with a bearing surface (6) on the face (7) of the frill shaft (1) and extends with a fixing stud (9) that projects centrally from the bearing surface (6) into a receiving recess (10) which is configured complementary thereto in the face (7) of the drill shaft (1), characterized by the fact that at least one peripheral segment (13) of the fixing stud (9) has a first longitudinal segment (15) which with a screw surface (16) that points away from the drill shaft (1), slopes upward in the direction of rotation (18) of the drill bit toward the drill bit tip (5) and interacts with an opposite surface (19) on the inner wall (14) of the receiving recess (10), merges into a second longitudinal section (17).
  • [0042]
    Another feature (or aspect) of an embodiment of the invention resides broadly in a drill bit, characterized by the fact that the second longitudinal segment (17) tapers toward its free end.
  • [0043]
    Yet another feature (or aspect) of an embodiment of the invention resides broadly in a drill bit, characterized by a first stud segment (22) forming the free end with a cylindrical peripheral surface, and a second segment (21) that has a conical peripheral surface and extends to the screw surface (16).
  • [0044]
    Still another feature (or aspect) of an embodiment of the invention resides broadly in a drill bit characterized by a rotation stop (25) that projects from the face (7) of the drill shaft (1) and projects into an essentially complementary shaped recess in the bearing surface (6) of the cutting insert (2).
  • [0045]
    A further feature (or aspect) of an embodiment of the invention resides broadly in a drill bit, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  • [0046]
    Another feature (or aspect) of an embodiment of the invention resides broadly in a drill bit, characterized by an angle (α) of 60°.
  • [0047]
    The components disclosed in the various publications, disclosed or incorporated by reference herein, may be used in the embodiments of the present invention, as well as equivalents thereof.
  • [0048]
    The appended drawings in their entirety, including all dimensions, proportions and/or shapes in at least one embodiment of the invention, are accurate and are hereby included by reference into this specification.
  • [0049]
    All, or substantially all, of the components and methods of the various embodiments may be used with at least one embodiment or all of the embodiments, if more than one embodiment is described herein.
  • [0050]
    All of the patents, patent applications and publications recited herein, and in the Declaration attached hereto, are hereby incorporated by reference as if set forth in their entirety herein.
  • [0051]
    The corresponding foreign and international patent publication applications, namely, Federal Republic of Germany Application No. 199 36 579.2, filed on Aug. 3, 1999, having inventor Ulrich KRENZER, and DE-OS 199 36 579.2, having inventor Ulrich KRENZER, and DE-PS 199 36 579.2, having inventor Ulrich KRENZER, and International Application No. PCT/EP00/04851, filed on May 27, 2000, having inventor Ulrich KRENZER, as well as their published equivalents, and other equivalents or corresponding applications, if any, in corresponding cases in the Federal Republic of Germany and elsewhere, and the references and documents cited in any of the documents cited herein, such as the patents, patent applications and publications, are hereby incorporated by reference as if set forth in their entirety herein.
  • [0052]
    All of the references and documents, cited in any of the documents cited herein, are hereby incorporated by reference as if set forth in their entirety herein. All of the documents cited herein, referred to in the immediately preceding sentence, include all of the patents, patent applications and publications cited anywhere in the present application.
  • [0053]
    The details in the patents, patent applications and publications may be considered to be incorporable, at applicant's option, into the claims during prosecution as further limitations in the claims to patentably distinguish any amended claims from any applied prior art.
  • [0054]
    The following U.S. Patents regarding drills and/or drill inserts are hereby incorporated by reference as if set forth in their entirety herein: U.S. Pat. No. 5,800,100, having attorney docket no. NHL-KEH-03-NP, issued to Krenzer on Sep. 1, 1998; NHL-KEH-06, issued to Kammermeier on Nov. 3, 1998; U.S. Pat. No. 5,967,710, having attorney docket no. NHL-KEH-02-NP, issued to Krenzer on Oct. 9, 1999; U.S. Pat. No. 6,045,301, having attorney docket no. NHL-KEH-04 US, issued to Kammermeier et al. on Apr. 4, 2000; U.S. Pat. No. 6,116,825, having attorney docket no. NHL-KEH-05 US, issued to Kammermeier et al. on Sep. 12, 2000; U.S. Pat. No. 6,164,879, having attorney docket no. NHL-KEH-02-NP-D, issued to Krenzer on Dec. 26, 2000; U.S. Pat. No. 6,210,083, having attorney docket no. NHL-KEH-05-C US, issued to Kammermeier et al. on Apr. 3, 2001; U.S. Pat. No. 6,231,276, having attorney docket no. NHL-KEH-09 US, issued to Muller et al. on May 15, 2001; U.S. Pat. No. 5,904,455, having attorney docket no. NHL-KEH-08, issued to inventors Krenzer et al. on May 18, 1999; and U.S. Pat. No. 6,309,149, having attorney docket no. NHL-KEH-12 US, issued to inventor BORSCHERT on Oct. 30, 2001.
  • [0055]
    The following U.S. Patent Applications regarding drills and/or drill inserts are hereby incorporated by reference as if set forth in their entirety herein: Ser. No. 09/521,134, having attorney docket no. NHL-KEH-13 US, having inventors Gebhard MÜLLER and Horst JAGER, filed on Mar. 8, 2000; Ser. No. 09/927,921, having attorney docket no. NHL-KEH-14 US, having inventors Bernhard Walter BORSCHERT, Jochen STIES, Dieter Hermann MUHLFRIEDEL, and Karl-Heinz WENDT, filed on Aug. 10, 2001; Ser. No. 09/935,078, having attorney docket no. NHL-KEH-15, having inventors Hans-Wilm HEINRICH, Manfred WOLF, and Dieter SCHMIDT, filed on Aug. 22, 2001; Ser. No. 09/966,735, having attorney docket no. NHL-KEH-16 US, having inventor Ulrich KRENZER, filed on Sep. 28, 2001; and Ser. No. 10/008,528, having attorney docket no. NHL-KEH-17, having inventor Rudi HARTLOHNER, filed on Nov. 5, 2001;.
  • [0056]
    Some examples of twist drills that may possibly be utilized or adapted for use in at least one possible embodiment of the present invention may possibly be found in the following U.S. patents: U.S. Pat. No. 4,209,275, issued to Kim on Jun. 24, 1980; U.S. Pat. No. 4,556,347, issued to Barish on Dec. 3, 1985; U.S. Pat. No. 4,688,972, issued to Kubota on Aug. 25, 1987; U.S. Pat. No. 4,756,650, issued to Wakihira et al. on Jul. 12, 1988; U.S. Pat. No. 4,762,445, issued to Bunting et al. on Aug. 9, 1988; U.S. Pat. No. 5,230,593, issued to Imanaga et al. on Jul. 27, 1993; U.S. Pat. No. 5,350,261, issued to Takaya et al. on Sep. 27, 1994; U.S. Pat. No. 5,442,979, issued to Hsu on Aug. 22, 1995; U.S. Pat. No. 5,678,960, issued to Just et al. on Oct. 21, 1997; U.S. Pat. No. 5,931,615, issued to Wiker on Aug. 3, 1999; and U.S. Pat. No. 6,283,682, issued to Plummer on Sep. 4, 2001.
  • [0057]
    Some examples of other drills and drill inserts, features of which may possibly be utilized or adapted for use in at least one possible embodiment of the present invention may possibly be found in the following U.S. patents: U.S. Pat. No. 4,072,438, issued to Powers on Feb. 7, 1978; U.S. Pat. No. 4,131,383, issued to Powers on Dec. 26, 1978; U.S. Pat. No. 4,220,429, issued to Powers et al. on Sep. 2, 1980; U.S. Pat. No. 4,563,113, issued to Ebenhoch on Jan. 7, 1986; U.S. Pat. No. 5,173,014, issued to Agapiou et al. on Dec. 22, 1992; U.S. Pat. No. 5,236,291, issued to Agapiou et al. on Aug. 17, 1993; U.S. Pat. No. 5,807,041, issued to Lindblom on Sep. 15, 1998; U.S. Pat. No. 5,947,659, issued to Mays on Sep. 7, 1999; and U.S. Pat. No. 6,071,046, issued to Hecht et al. on Jun. 6, 2000.
  • [0058]
    Some examples of drills and/or drill bits with tungsten carbide that may possibly be utilized or adapted for use in at least one possible embodiment of the present invention may possibly be found in the following U.S. patents: U.S. Pat. No. 6,135,218, issued to Deane et al. on Oct. 24, 2000; U.S. Pat. No. 6,029,544, issued to Katayama on Feb. 29, 2000; U.S. Pat. No. 5,979,571, issued to Scott et al. on Nov. 9, 1999; U.S. Pat. No. 5,836,409, issued to Vail, III on Nov. 17, 1998; U.S. Pat. No. 4,241,483, issued to Voitas on Dec. 30, 1980; U.S. Pat. No. 4,200,159, issued to Peschel et al. on Apr. 29, 1980; and U.S. Pat. No. 4,169,637, issued to Voitas on Oct. 2, 1979.
  • [0059]
    Some examples of drills and/or drill bits with titanium carbide that may possibly be utilized or adapted for use in at least one possible embodiment of the present invention may possibly be found in the following U.S. patents: U.S. Pat. No. 5,882,152, issued to Janitzki on Mar. 16, 1999 and U.S. Pat. No. 4,211,294, issued to Multakh on Jul. 8, 1980.
  • [0060]
    Some examples of high strength steel that may possibly be utilized or adapted for use in at least one possible embodiment of the present invention may possibly be found in the following U.S. patents: U.S. Pat. No. 4,578,113, issued to Rana et al. on Mar. 25, 1986; U.S. Pat. No. 4,720,307, issued to Matsumoto et al. on Jan. 19, 1988; U.S. Pat. No. 4,814,141, issued to Imai et al. on Mar. 21, 1989; U.S. Pat. No. 4,826,543, issued to Yano et al. on May 2, 1989; U.S. Pat. No. 4,956,025, issued to Koyama et al. on Sep. 11, 1990; U.S. Pat. No. 5,651,938, issued to Thomson et al. on Jul. 29, 1997; U.S. Pat. No. 5,772,957, issued to Thomson et al. on Jun. 30, 1998; and U.S. Pat. No. 5,798,004, issued to Tamehiro et al. on Aug. 25, 1998.
  • [0061]
    Some examples of numerical control systems involving drills or drilling processes may possibly be found in the following U.S. Patents: U.S. Pat. No. 6,232,736, entitled “Numerical control machine tool positioning system”; U.S. Pat. No. 6,107,768, entitled “Numerical control apparatus for a machine tool”; U.S. Pat. No. 6,036,347, entitled “Numerical control information generator for controlling machine tool processes which require tool exchanges”; U.S. Pat. No. 5,815,400, entitled “Machining method using numerical control apparatus”; U.S. Pat. No. 5,532,932, entitled “Numerical control unit”; U.S. Pat. No. 5,493,502, entitled “Numerical control unit for controlling a machine tool to machine a workpiece at an instructed feed rate along linear and rotational axes”; U.S. Pat. No. 4,972,322, entitled “Method for preparing numerical control data for a machine tool”; U.S. Pat. No. 4,914,364, entitled “Numerical control apparatus”; U.S. Pat. No. 4,862,380, entitled “Numerical control unit”; U.S. Pat. No. 4,831,906, entitled “Numerical control machine”; U.S. Pat. No. 4,794,311, entitled “Numerical control system”; U.S. Pat. No. 4,788,481, entitled “Numerical control apparatus”; U.S. Pat. No. 4,751,652, entitled “Numerical control drilling restart control system”; U.S. Pat. No. 4,719,579, entitled “Numerical control method”; U.S. Pat. No. 4,667,294, entitled “Numerical control apparatus”; U.S. Pat. No. 4,624,607, entitled “Computed numerical control drilling machine”; U.S. Pat. No. 4,588,339, entitled “Tool holder for a cutting machine provided with numerical control”; U.S. Pat. No. 4,549,270, entitled “Method of controlling selection of tools in a quadriaxial numerical control lathe”; U.S. Pat. No. 4,547,854, entitled “Method of controlling lineup of tools in numerical control machine tool”; U.S. Pat. No. 4,199,814, entitled “Computer numerical control machine tool”; and U.S. Pat. No. 4,149,235, entitled “Computer numerical control system for machine tool.
  • [0062]
    The invention as described hereinabove in the context of the preferred embodiments is not to be taken as limited to all of the provided details thereof, since modifications and variations thereof may be made without departing from the spirit and scope of the invention.
    NOMENCLATURE
     1 Drill shaft
     2 Cutting insert
     3 Chip flute
     3a Chip flute segment
     4 Major cutting edge
     5 Drill tip
     6 Bearing surface
     7 Face
     8 Center longitudinal axis
     9 Fixing stud
    10 Receiving recess
    11 Opening
    12 Joint
    13 Peripheral segment
    14 Inside wall
    15 First longitudinal segment
    16 Screw surface
    17 Second longitudinal
    segment
    18 Direction of rotation of
    drill bit
    19 Opposite surface
    20 Arrow
    21 Conical segment
    22 Cylindrical segment
    23 Area
    24 Wall thickness
    25 Rotation stop
    26 Outside surface
    27 Inside surface
    28 Opposite surface
    29 Recess
    30 Inclined surface
    31 Inclined surface
    32 Face
    33 Inclined surface
    α Angle

Claims (20)

    What is claimed is:
  1. 1. A twist drill comprising:
    a shaft comprising a first end and a second end disposed opposite said first end;
    said first end of said shaft comprising a shank portion being configured to be inserted into and held by a chuck;
    a replaceable drilling insert being removably attached to said second end of said shaft;
    said drilling insert comprising a drill tip being configured to cut an object;
    at least a first chip flute and a second chip flute;
    each of said first and second chip flutes comprising a first chip flute portion disposed on said shaft and a second chip flute portion disposed on said drilling insert;
    said second end of said shaft comprising a recess;
    said recess comprising a bottom wall and at least one side wall disposed between said bottom wall and said end face;
    said drilling insert comprising a fixing stud;
    said fixing stud being configured and disposed to be inserted into said recess to removably attach said drilling insert to said shaft;
    said drilling insert comprising a bearing surface disposed about said fixing stud;
    said shaft comprising an end face disposed about said recess;
    said drilling insert bearing surface being complementary to said shaft end face and being configured and disposed to contact and rest against said shaft end face;
    said fixing stud comprising at least one projection;
    said at least one projection being in the shape of a portion of a screw thread and being configured to slope away from said shaft toward said drill tip in the manner of a screw thread;
    said at least one projection being disposed to run substantially less than 180 degrees around a section of the perimeter of said fixing stud from said first chip flute to said second chip flute;
    said at least one side wall comprising a grooved portion;
    the shape of said grooved portion of said recess being complementary to the shape of said at least one projection of said fixing stud;
    said grooved portion being disposed to run substantially less than 180 degrees around a section of said at least one side wall from said first chip flute to said second chip flute;
    said drilling insert being configured to be rotated, upon insertion into said recess, substantially less than 180 degrees to engage said grooved portion, in a screwing motion, with said at least one projection to screw said drilling insert into said recess to tighten and sufficiently firmly seat said drilling insert in said recess to prepare the twist drill for drilling; and
    said fixing stud comprising a first portion being disposed substantially transverse to said bearing surface and between said bearing surface and said at least one projection.
  2. 2. A drill comprising:
    a shaft;
    a replaceable drilling insert being removably attached to said shaft;
    said drilling insert comprising a drill tip being configured to cut an object;
    at least one chip flute;
    said at least one chip flute comprising a first chip flute portion disposed on said shaft and a second chip flute portion disposed on said drilling insert;
    said shaft comprising a recess configured and disposed to receive said drilling insert and to hold said drilling insert during drilling;
    said drilling insert comprising an extending portion being configured and disposed to extend into said recess of said shaft;
    said extending portion comprising at least one projection;
    said at least one projection being in the shape of a portion of a screw thread and being disposed to run less than 180 degrees around a section of the perimeter of said extending portion;
    said recess of said shaft comprising at least one grooved portion;
    said grooved portion being disposed to run less than 180 degrees around a section of the interior of said recess and being configured to be engaged by said at least one projection; and
    said drilling insert and said shaft each being configured to be relatively rotated, upon insertion of said drilling insert into said recess, substantially less than 180 degrees to engage said grooved portion, in a screwing motion, with said at least one projection to screw together said drilling insert and said shaft to tighten and sufficiently firmly seat said drilling insert in said recess to prepare the drill for drilling.
  3. 3. A replaceable drill insert configured to be removably attached to a drill shaft, said drill insert comprising:
    a drill tip being configured to cut an object;
    an extending portion being configured to extend into a recess in a drill shaft to removably attach said drill insert to a drill shaft and to hold said drill insert in a drill shaft during drilling;
    said extending portion comprising at least one projection;
    said at least one projection being in the shape of a portion of a screw thread and being disposed to run less than 360 degrees around a section of the perimeter of said extending portion;
    said at least one projection being configured to project into and engage a grooved portion in a recess in a drill shaft; and
    said drill insert being configured to be relatively rotated with a drill shaft, upon insertion of said drill insert into a recess in a drill shaft, less than 360 degrees to engage a grooved portion of a recess in a drill shaft with said at least one projection to screw together said drill insert and a drill shaft to tighten and sufficiently firmly seat said drill insert in a drill shaft to prepare a drill for drilling.
  4. 4. A method of using a drill with a replaceable drill insert, said drill insert comprising: a drill tip being configured to cut an object; an extending portion being configured to extend into a recess in a drill shaft to removably attach said drill insert to a drill shaft and to hold said drill insert in a drill shaft during drilling; said extending portion comprising at least one projection; said at least one projection being in the shape of a portion of a screw thread and being disposed to run less than 360 degrees around a section of the perimeter of said extending portion; said at least one projection being configured to project into and engage a grooved portion in a recess in a drill shaft; and said drill insert being configured to be relatively rotated with a drill shaft, upon insertion of said drill insert into a recess in a drill shaft, less than 360 degrees to engage a grooved portion of a recess in a drill shaft with said at least one projection to screw together said drill insert and a drill shaft to tighten and sufficiently firmly seat said drill insert in a drill shaft to prepare a drill for drilling; said method comprising the steps of:
    inserting said drill insert into a recess in a drill shaft;
    aligning said at least one projection with a grooved portion in a recess in a drill shaft;
    relatively rotating said drill insert and a drill shaft less than 180 degrees to engage a grooved portion of the drill shaft with said at least one projection to screw together said drill insert and the drill shaft to tighten and sufficiently firmly seat said drill insert in the drill shaft to prepare a drill for drilling;
    removing said drill insert from a drill shaft by unscrewing said drill insert upon said drill insert being substantially worn as a result of drilling;
    inserting a new drill insert into a recess in a drill shaft;
    aligning at least one projection of said new drill insert with a grooved portion in a recess in a drill shaft; and
    relatively rotating said new drill insert and a drill shaft less than 180 degrees to engage a grooved portion of the drill shaft with said at least one projection of said new drill insert to screw together said new drill insert and the drill shaft to tighten and sufficiently firmly seat said new drill insert in the drill shaft to prepare a drill for drilling.
  5. 5. Drill bit with a drill bit shaft (1) and a cutting insert that forms the tip area of the drill bit and is detachable fixed to the drill bit shaft, and at least one chip flute (3) that is located in the drill bit shaft (1) and extends into the cutting insert (2), whereby the cutting insert is in contact with a bearing surface (6) on the face (7) of the frill shaft (1) and extends with a fixing stud (9) that projects centrally from the bearing surface (6) into a receiving recess (10) which is configured complementary thereto in the face (7) of the drill shaft (1), characterized by the fact that at least one peripheral segment (13) of the fixing stud (9) has a first longitudinal segment (15) which with a screw surface (16) that points away from the drill shaft (1), slopes upward in the direction of rotation (18) of the drill bit toward the drill bit tip (5) and interacts with an opposite surface (19) on the inner wall (14) of the receiving recess (10), merges into a second longitudinal section (17).
  6. 6. Drill bit as claimed in claim 5, characterized by the fact that the second longitudinal segment (17) tapers toward its free end.
  7. 7. Drill bit as claimed in claim 6, characterized by a first stud segment (22) forming the free end with a cylindrical peripheral surface, and a second segment (21) that has a conical peripheral surface and extends to the screw surface (16).
  8. 8. Drill bit as claimed in claim 5, characterized by a rotation stop (25) that projects from the face (7) of the drill shaft (1) and projects into an essentially complementary shaped recess in the bearing surface (6) of the cutting insert (2).
  9. 9. Drill bit as claimed in claim 6, characterized by a rotation stop (25) that projects from the face (7) of the drill shaft (1) and projects into an essentially complementary shaped recess in the bearing surface (6) of the cutting insert (2).
  10. 10. Drill bit as claimed in claim 7, characterized by a rotation stop (25) that projects from the face (7) of the drill shaft (1) and projects into an essentially complementary shaped recess in the bearing surface (6) of the cutting insert (2).
  11. 11. Drill bit as claimed in claim 5, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  12. 12. Drill bit as claimed in claim 6, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  13. 13. Drill bit as claimed in claim 7, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  14. 14. Drill bit as claimed in claim 8, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  15. 15. Drill bit as claimed in claim 9, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  16. 16. Drill bit as claimed in claim 10, characterized by the fact that the screw surface (16) forms an angle (α) of 90° to 45° with the longitudinal axis (8) of the drill bit.
  17. 17. Drill bit as claimed in claim 11, characterized by an angle (α) of 60°.
  18. 18. Drill bit as claimed in claim 12, characterized by an angle (α) of 60°.
  19. 19. Drill bit as claimed in claim 13, characterized by an angle (α) of 60°.
  20. 20. Drill bit as claimed in claim 16, characterized by an angle (α) of 60°.
US10061448 1999-08-03 2002-02-01 Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill Abandoned US20020159851A1 (en)

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DE19936579.2 1999-08-03
DE19936579 1999-08-03
PCT/EP2000/004851 WO2001008840A1 (en) 1999-08-03 2000-05-27 Drill bit having a replaceable cutting head

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US10839950 US7070367B2 (en) 1999-08-03 2004-05-06 Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill

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US20020159851A1 true true US20020159851A1 (en) 2002-10-31

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US10839950 Active US7070367B2 (en) 1999-08-03 2004-05-06 Twist drill for drilling having a replaceable drill tip, and a replaceable drill tip for use in a twist drill

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EP (1) EP1200222B1 (en)
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Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6506003B1 (en) * 2001-10-02 2003-01-14 Kennametal Inc. Cutting tool
US6582164B1 (en) * 2002-02-25 2003-06-24 Kennametal Inc. Roller twist drill
US20050084352A1 (en) * 2002-02-21 2005-04-21 Bernhard Borschert Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US20050135887A1 (en) * 2003-12-17 2005-06-23 Borschert Bernhard W. Twist drill
US20050274551A1 (en) * 2004-06-09 2005-12-15 Rainer Batliner Drill
US20060072976A1 (en) * 2004-10-05 2006-04-06 Frota De Souza Ruy Modular drill
US20060093449A1 (en) * 2004-10-28 2006-05-04 Iscar Ltd. Cutting tool assembly and cutting head therefor
US20080095588A1 (en) * 2006-10-18 2008-04-24 Henderer Willard E Spiral flute tap
US20080166194A1 (en) * 2007-01-09 2008-07-10 Durfee Laverne R Drill bit
US20080181735A1 (en) * 2007-01-25 2008-07-31 Ting Fong Electric & Machinery Co., Ltd. Method for manufacturing drill cutters and structure thereof
US20080247899A1 (en) * 2007-04-03 2008-10-09 Cho H Sam Contoured PCD and PCBN for twist drill tips and end mills and methods of forming the same
US20090010709A1 (en) * 2007-07-03 2009-01-08 Seco Tools Ab Multi-piece tool assembly and cutting tool
US20090311060A1 (en) * 2008-04-14 2009-12-17 Seco Tools Ab T00l for rotary cutting machining
US20100003094A1 (en) * 2007-01-09 2010-01-07 Irwin Industrial Tool Company Drill bit
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
US20100307640A1 (en) * 2009-06-03 2010-12-09 Durfee La Verne R Cutting edge and cutting tool
US20110020085A1 (en) * 2009-07-27 2011-01-27 Hilti Aktiengesellschaft Drill and production method
US8070397B2 (en) 2008-02-19 2011-12-06 Irwin Industrial Tool Company Self feed bit
CN102847992A (en) * 2012-09-21 2013-01-02 株洲钻石切削刀具股份有限公司 Drilling processing cutter
US20130006248A1 (en) * 2010-03-19 2013-01-03 CPL Holdings Pty. Ltd. Drill bit
US20130317508A1 (en) * 2011-02-11 2013-11-28 CPL Holdings Pty. Ltd. Drill Bit
US8678723B2 (en) 2009-08-18 2014-03-25 Osg Corporation Throw-away rotating tool
US8864425B2 (en) 2009-02-04 2014-10-21 Osg Corporation Bevel head replaceable rotary tool, bevel head and tool body
US8931982B2 (en) 2009-12-08 2015-01-13 Osg Corporation Throw-away rotating tool
CN104827101A (en) * 2015-05-26 2015-08-12 苏州阿诺精密切削技术股份有限公司 Y-shaped inner-cooling double-bolt locking tooth crown drill rod
CN105171060A (en) * 2015-09-30 2015-12-23 苏州阿诺精密切削技术股份有限公司 Tooth crown blade locked through double screws in V-shaped positioning groove
CN105290466A (en) * 2015-12-04 2016-02-03 苏州阿诺精密切削技术股份有限公司 Crossed-groove positioning double-screw locking crown drill rod
CN105328244A (en) * 2015-12-04 2016-02-17 苏州阿诺精密切削技术股份有限公司 Cross groove positioning double-screw locking crown drilling bit
US9468980B2 (en) 2007-04-03 2016-10-18 H. Sam Cho Contoured PCD and PCBN segments for cutting tools containing such segments
US20170100784A1 (en) * 2015-10-07 2017-04-13 Kennametal Inc. Cutting head, rotary tool and support for the rotary tool and for the accommodation of the cutting head
US9643264B2 (en) 2013-07-25 2017-05-09 Kennametal Inc. Coupling mechanism for cutting tool
US9643262B2 (en) 2013-07-25 2017-05-09 Kennametal Inc. Coupling mechanism for cutting tool
USD798922S1 (en) 2015-10-07 2017-10-03 Kennametal Inc. Cutting head for rotary drill
USD798921S1 (en) 2015-10-07 2017-10-03 Kennametal Inc. Cutting head for modular drill

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273373B1 (en) * 2001-06-06 2009-10-07 Sandvik Intellectual Property AB Rotatable tool having a replaceable cutting head at the chip removing, free end of the tool
KR100438437B1 (en) 2002-04-10 2004-07-03 삼성전자주식회사 Optical cross connector in optical communication network and method for a processing
EP2399531B1 (en) * 2002-08-08 2016-01-27 Surgibit Ip Holdings Pty Limited Drill bit
US6929426B2 (en) * 2003-02-19 2005-08-16 Kennametal Inc. Indexable cutting tool
JP4764421B2 (en) * 2004-05-24 2011-09-07 イスカーリミテッド Drill having a removable cutting head
US7374376B2 (en) * 2004-09-24 2008-05-20 Seco Tools Ab Cutting tool
JP2007038362A (en) * 2005-08-04 2007-02-15 Osg Corp Cutting tool
US20070057015A1 (en) * 2005-09-09 2007-03-15 Kevin Colligan Tapered friction stir welding and processing tool
US20070116539A1 (en) * 2005-11-22 2007-05-24 Iscar Ltd. Cutting Tool Assembly Having Three-Start Threaded Coupling system
DE102006000221A1 (en) * 2006-05-10 2007-11-15 Hilti Ag Hard material drilling head
US20070274794A1 (en) * 2006-05-26 2007-11-29 Cirino Thomas J Oblique angle serration location and drive interface
US7717654B2 (en) * 2006-05-26 2010-05-18 Cirino Thomas J Drill tip with serrated and dowel pinned shank interface
DE102006000251A1 (en) 2006-05-30 2007-12-06 Hilti Ag Hard head and rotary percussion drill
US8021088B2 (en) 2007-02-12 2011-09-20 Iscar, Ltd. Tool with releasably mounted self-clamping cutting head
US7972094B2 (en) * 2007-02-12 2011-07-05 Iscar, Ltd. Rotary cutting tool having releasably mounted self-clamping cutting head with locking member
US7544026B2 (en) * 2007-02-13 2009-06-09 Irwin Industrial Tool Company Drill bit screw tip
DE102007044095A1 (en) * 2007-09-14 2009-03-19 Hartmetall-Werkzeugfabrik Paul Horn Gmbh Drill with drill bit
US7740088B1 (en) 2007-10-30 2010-06-22 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Ultrasonic rotary-hammer drill
WO2008072840A3 (en) * 2007-11-05 2008-09-18 Taegu Tec Ltd Rotary cutting tool
US7625161B1 (en) 2008-08-08 2009-12-01 Kennametal Inc. Rotary cutting tool assembly and cutting insert and tool shank therefor
DE102009042665A1 (en) * 2009-09-23 2011-05-19 Esa Eppinger Gmbh Interface between a receiving body and a formed in particular as a tool or workpiece holder insert
CN102159351B (en) * 2009-12-08 2014-12-17 Osg株式会社 Throw-away rotary tool
DE202011050277U1 (en) 2011-05-30 2012-07-04 Gerhard Bockholt drilling
US9409241B2 (en) * 2012-12-13 2016-08-09 Iscar, Ltd. Cutting tool and replaceable cutting head having spiral driven surfaces therefor
FR3004746B1 (en) * 2013-04-19 2015-05-15 Diager Cutting insert
DE102013220884A1 (en) * 2013-10-15 2015-04-16 Kennametal Inc. Modular tool holder and tool head
DE102014206796A1 (en) 2014-04-08 2015-10-08 Kennametal Inc. Rotary tool, in particular a drill and cutting head for such a rotary tool
DE102015106082A1 (en) * 2014-04-24 2015-10-29 Kennametal India Ltd. Cutting tool with replaceable cutting insert and inclined fasteners
US9889509B2 (en) 2014-05-05 2018-02-13 Kennametal Inc. Cutter heads with improved coupling
CN104588739B (en) * 2014-12-30 2017-02-22 株洲钻石切削刀具股份有限公司 A rotary cutting tools
CN104907614A (en) * 2015-05-26 2015-09-16 苏州阿诺精密切削技术股份有限公司 V-shaped locating double-screw locking crown drill rod
CN104827094A (en) * 2015-05-26 2015-08-12 苏州阿诺精密切削技术股份有限公司 V-shaped positioning double-screw locking tooth crown drill bit
DE102015211744A1 (en) 2015-06-24 2016-12-29 Kennametal Inc. Rotary tool, in particular a drill for such a rotary tool
CN105171062A (en) * 2015-09-30 2015-12-23 苏州阿诺精密切削技术股份有限公司 Double-bolt locking crown drill rod in V-shaped positioning groove

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE367010C (en) * 1923-01-15 Georg Samuel Dipl Ing Drills with schwalbenschwanzfoermig inserted head speed steel
DE524677C (en) 1931-05-11 Emil Kremer Drills for the exchangeable cutting knives metalworking
DE94340C (en) *
US756339A (en) * 1903-11-14 1904-04-05 William R Down Composite drill.
US932071A (en) 1908-12-10 1909-08-24 Arthur Haendler Spiral drill.
FR828642A (en) * 1937-11-03 1938-05-24 Improvement in forest
FR907980A (en) 1944-05-24 1946-03-27 Improvements in machining and grinding tools employing blunt crystals or any hard and brittle materials
US3293727A (en) 1961-04-12 1966-12-27 Bilt Rite Tool & Machine Co Cutting tool
US3153356A (en) * 1962-12-17 1964-10-20 Howard K Dearborn Gun drill
US3359837A (en) 1965-01-26 1967-12-26 Detroit Reamer & Tool Company Rotary tool construction
CA1192063A (en) 1981-10-12 1985-08-20 Hugo Linden Extensible drill
DE3306209C2 (en) 1983-02-23 1985-02-28 Iscar Hartmetall Gmbh, 7505 Ettlingen, De
DE69025753T2 (en) 1989-12-25 1996-10-31 Sumitomo Electric Industries Drills with disposable use
US5024563A (en) 1989-09-08 1991-06-18 North East Form Engineering, Inc. Cutting apparatus
EP0443517B1 (en) 1990-02-20 1995-09-06 Sumitomo Electric Industries, Ltd. Throw-away tipped drill
US5114286A (en) * 1991-08-13 1992-05-19 Calkins Donald W Interchangeable tool alignment system
DE4435857A1 (en) 1994-10-07 1996-04-11 Kennametal Hertel Ag Drill with a drill point
US6012881A (en) 1995-03-03 2000-01-11 Komet Praezisionswerkzeuge Robert Breuning Gmbh Drilling tool
JP3307809B2 (en) 1995-10-05 2002-07-24 兼房株式会社 Rotary tool with a shank
DE19543233A1 (en) 1995-11-07 1997-05-15 Johne & Co Praezisionswerkzeug Drilling tool with replaceable tip
DE69726835D1 (en) * 1996-09-13 2004-01-29 Seco Tools Ab Publ Fagersta Tool for cutting machines
KR100503180B1 (en) 1996-11-04 2005-07-25 세코 툴스 에이비 Tool for chip removing machining
EP0984841B2 (en) 1997-05-29 2009-06-24 Iscar Ltd. A cutting tool assembly and a replaceable cutting head for use therein
US6283682B1 (en) * 1997-09-30 2001-09-04 Jerald D. Plummer Helically fluted twist drill device
US6071045A (en) 1998-05-06 2000-06-06 Janness; Daniel Cutting insert and tool
KR100592014B1 (en) * 1998-08-13 2006-06-21 이스카 엘티디. The cutting head and the tool holder coupling
DE19945097B4 (en) 1999-09-21 2008-04-17 J. Kühl - 3K - Engineering clamping means
US6582164B1 (en) * 2002-02-25 2003-06-24 Kennametal Inc. Roller twist drill

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6506003B1 (en) * 2001-10-02 2003-01-14 Kennametal Inc. Cutting tool
US8366358B2 (en) 2002-02-21 2013-02-05 Kennametal Inc. Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US20050084352A1 (en) * 2002-02-21 2005-04-21 Bernhard Borschert Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US7360974B2 (en) 2002-02-21 2008-04-22 Kennametal Inc. Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US7832967B2 (en) 2002-02-21 2010-11-16 Kennametal Inc. Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US8807888B2 (en) 2002-02-21 2014-08-19 Kennametal Inc. Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US20110020086A1 (en) * 2002-02-21 2011-01-27 Bernhard Borschert Rotary cutting tool, such as a drill, comprising an exchangeable cutting insert, and an exchangeable cutting insert
US6582164B1 (en) * 2002-02-25 2003-06-24 Kennametal Inc. Roller twist drill
US7101125B2 (en) * 2003-12-17 2006-09-05 Kennametal Inc. Twist drill
US20050135887A1 (en) * 2003-12-17 2005-06-23 Borschert Bernhard W. Twist drill
US20050274551A1 (en) * 2004-06-09 2005-12-15 Rainer Batliner Drill
US7497282B2 (en) 2004-06-09 2009-03-03 Hilti Aktiengesellschaft Drill bit having radially extending cutting bits on radial legs
US7309196B2 (en) 2004-10-05 2007-12-18 Kennametal Inc. Modular drill
US20060072976A1 (en) * 2004-10-05 2006-04-06 Frota De Souza Ruy Modular drill
USRE44915E1 (en) 2004-10-05 2014-05-27 Kennametal Inc. Modular drill
US7407350B2 (en) * 2004-10-28 2008-08-05 Iscar Ltd. Cutting tool assembly and cutting head therefor
US20060093449A1 (en) * 2004-10-28 2006-05-04 Iscar Ltd. Cutting tool assembly and cutting head therefor
US20080095588A1 (en) * 2006-10-18 2008-04-24 Henderer Willard E Spiral flute tap
US7950880B2 (en) * 2006-10-18 2011-05-31 Kennametal Inc. Spiral flute tap
US20080166194A1 (en) * 2007-01-09 2008-07-10 Durfee Laverne R Drill bit
US20100003094A1 (en) * 2007-01-09 2010-01-07 Irwin Industrial Tool Company Drill bit
US20080181735A1 (en) * 2007-01-25 2008-07-31 Ting Fong Electric & Machinery Co., Ltd. Method for manufacturing drill cutters and structure thereof
US9468980B2 (en) 2007-04-03 2016-10-18 H. Sam Cho Contoured PCD and PCBN segments for cutting tools containing such segments
US8052765B2 (en) * 2007-04-03 2011-11-08 Cho H Sam Contoured PCD and PCBN for twist drill tips and end mills and methods of forming the same
US20080247899A1 (en) * 2007-04-03 2008-10-09 Cho H Sam Contoured PCD and PCBN for twist drill tips and end mills and methods of forming the same
US7980795B2 (en) * 2007-07-03 2011-07-19 Seco Tools Ab Multi-piece tool assembly and cutting tool
US20090010709A1 (en) * 2007-07-03 2009-01-08 Seco Tools Ab Multi-piece tool assembly and cutting tool
US8070397B2 (en) 2008-02-19 2011-12-06 Irwin Industrial Tool Company Self feed bit
US20090311060A1 (en) * 2008-04-14 2009-12-17 Seco Tools Ab T00l for rotary cutting machining
US8142116B2 (en) * 2008-04-14 2012-03-27 Seco Tools Ab Tool for rotary cutting machining
US7861807B2 (en) 2008-12-03 2011-01-04 Black & Decker Inc. Drill bit including one piece cutting head
US20100135741A1 (en) * 2008-12-03 2010-06-03 Black & Decker Inc. Drill Bit Including One Piece Cutting Head
US8864425B2 (en) 2009-02-04 2014-10-21 Osg Corporation Bevel head replaceable rotary tool, bevel head and tool body
US20100307640A1 (en) * 2009-06-03 2010-12-09 Durfee La Verne R Cutting edge and cutting tool
US8777527B2 (en) * 2009-07-27 2014-07-15 Hilti Aktiengesellschaft Drill production method
US20110020085A1 (en) * 2009-07-27 2011-01-27 Hilti Aktiengesellschaft Drill and production method
US8678723B2 (en) 2009-08-18 2014-03-25 Osg Corporation Throw-away rotating tool
US8931982B2 (en) 2009-12-08 2015-01-13 Osg Corporation Throw-away rotating tool
US20130006248A1 (en) * 2010-03-19 2013-01-03 CPL Holdings Pty. Ltd. Drill bit
US20130317508A1 (en) * 2011-02-11 2013-11-28 CPL Holdings Pty. Ltd. Drill Bit
CN102847992A (en) * 2012-09-21 2013-01-02 株洲钻石切削刀具股份有限公司 Drilling processing cutter
US9643264B2 (en) 2013-07-25 2017-05-09 Kennametal Inc. Coupling mechanism for cutting tool
US9643262B2 (en) 2013-07-25 2017-05-09 Kennametal Inc. Coupling mechanism for cutting tool
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US20170100784A1 (en) * 2015-10-07 2017-04-13 Kennametal Inc. Cutting head, rotary tool and support for the rotary tool and for the accommodation of the cutting head
USD798922S1 (en) 2015-10-07 2017-10-03 Kennametal Inc. Cutting head for rotary drill
USD798921S1 (en) 2015-10-07 2017-10-03 Kennametal Inc. Cutting head for modular drill
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CN105328244A (en) * 2015-12-04 2016-02-17 苏州阿诺精密切削技术股份有限公司 Cross groove positioning double-screw locking crown drilling bit

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US20040208716A1 (en) 2004-10-21 application
US7070367B2 (en) 2006-07-04 grant
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WO2001008840A1 (en) 2001-02-08 application
ES2195911T3 (en) 2003-12-16 grant

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