US20120079918A1 - Method and device for producing longitudinal components of metal with helical grooves, in particular spiral drill bits or screws - Google Patents

Method and device for producing longitudinal components of metal with helical grooves, in particular spiral drill bits or screws Download PDF

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Publication number
US20120079918A1
US20120079918A1 US13/377,727 US201013377727A US2012079918A1 US 20120079918 A1 US20120079918 A1 US 20120079918A1 US 201013377727 A US201013377727 A US 201013377727A US 2012079918 A1 US2012079918 A1 US 2012079918A1
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Prior art keywords
blank
section
mold
cold forming
helical grooves
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US13/377,727
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English (en)
Inventor
Hilmar Gensert
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Sieber Forming Solutions GmbH
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Sieber Forming Solutions GmbH
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Assigned to SIEBER FORMING SOLUTIONS GMBH reassignment SIEBER FORMING SOLUTIONS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GENSERT, HILMAR
Publication of US20120079918A1 publication Critical patent/US20120079918A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products
    • B21C23/147—Making drill blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K5/00—Making tools or tool parts, e.g. pliers
    • B21K5/02—Making tools or tool parts, e.g. pliers drilling-tools or other for making or working on holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills

Definitions

  • the invention relates to a method for producing longitudinal components of metal with helical grooves, in particular spiral drill bits or screws, and to a device suited for performing the method.
  • Drill bits of common design comprise at their tip at least two cutting edges removing a chip or drill dust (stone, concrete) from the material to be processed.
  • the drill bit For discharging the chips or the drill dust, the drill bit comprises helical grooves via which the chips or the drill dust are transported in a direction opposite to the feed direction.
  • a cylinder-shaped or multi-edged or specifically shaped shank for clamping into a chuck, for instance, of a drilling machine or of a drill hammer.
  • Drill bits such as, for instance, spiral or helical drill bits are produced in a per se known manner from solid matter, preferably steel, wherein the helical grooves are produced by metal-cutting processes or deformation processes such as rolling or cold or hot rolling, wherein the production technologies are different depending on the purpose of use of the drill bits.
  • the cutting blades positioned at the tip or at the head of the drill bits may possibly be equipped additionally with hard metal discs.
  • Stone drill bits with a hammer head are produced by pressing and subsequent rolling of the helical grooves, or by pressing and subsequent milling or grinding, respectively, of the grooves, or just by milling or grinding.
  • the helical grooves for stone drill bits with a cylindrical shank are rolled on a cylindrical blank or produced by milling and grinding.
  • the helical grooves are ground in a hardened cylindrical blank or formed by hot rolling in longitudinal direction and subsequent hardening and grinding.
  • Spirals may be produced by the twisting of longitudinally profiled blanks.
  • the production of the drill bits pursuant to the afore-mentioned method is time-consuming and cost-intensive.
  • EP 0 865 847 B1 discloses a method for producing a drill bit. Starting out from a blank with a cross-sectional shape of a two, three or four-corner part, the blank is clamped at its shank and twisted at the drill head, possibly under tension, so that a spiral helix with a drilling dust removal groove is produced. The production may be performed by cold or hot forming. By the twisting process the length of the drill bit is shortened along with a simultaneous increase of the diameter and a cushion deformation.
  • Screws in the meaning of the invention as filed are conveying screws or metering screws of metal, in particular steel, of smaller dimension and screws as force transmitting elements. Conveying or metering screws comprise, as a rule, a cylinder-shaped shank with helical grooves for the transportation of the material to be conveyed. The production methods for the aforementioned screws are approximately analogous to those of the production of drill bits.
  • DE 224576 discloses a method and a device for producing spiral drill bits, wherein a steel block heated to bright red heat or to white heat and thus moldable is used as a blank.
  • the blank is, to be deformable at all, heated to a temperature of more than 900° C. Only from this temperature on is it possible to press the blank through a mold and to cause the shaping thereof.
  • This method has substantial disadvantages since a blank would above all have to be taken to an energy-intensive temperature level and would have to be kept there in a reliable manner during the entire deformation process.
  • the object is solved by the features indicated in claim 1 .
  • At least one cold forming stage in which the blank is inserted in a guide mold without previous heating and is subsequently cold formed in a split mold comprising at least two movable jaws the inner wall of which comprises at least one section with a contour designed as a negative for forming helical grooves.
  • the cold forming process is triggered by a heading tool which is movable in axial direction and which engages at the free end of the blank that is positioned in the guide mold.
  • the blank Due to the existing pressure force the blank is pressed without previous heating at least partially through the central opening of the closed split mold. In so doing, helical grooves are produced on the shell of the blank during the contact with the mold contour due to plastical cold forming. After the termination of the cold pressing process, the split mold is opened and the blank that has been formed, for instance, to a drill bit or a screw is removed therefrom.
  • upstream cold forming stages may be provided in which the shank and/or the head of the blank are pre-formed.
  • the head of the blank may be flattened or the diameter thereof may be reduced in order to apply a cutting plate to this section after the finishing of the drill bit.
  • clamping there are different possibilities of clamping, in particular for drill bits which require different shank shapes.
  • the blank is guided at least partially, with its shank, in the guide mold assigned to the respective mold.
  • the forming force may be generated in the upstream forming stages by the axial movement of the heading tool.
  • the intermediate section of the blank may also be cold formed in an upstream forming stage. It is, for instance, flattened (forming from a round cross-sectional shape to a slot-type or elliptic cross-sectional shape).
  • the bottom section of the blank may, for instance, be formed to a leveled or flattened section. On the adjacent section there is then only formed a helix or spiral, respectively, which is designed such that the mold can be closed without any problems in the subsequent cold forming stage.
  • At least the cold forming stage in which the helical grooves for the drilling dust removal are generated on the blank is performed in a multi-stage press.
  • a metal wire cut to length may be used as a starting material for the blank, said metal wire being formed to a blank in one or several impact extrusion or compression stages.
  • the closing force for the jaws of at least one of the forming molds or the force for the movement of the heading tool may be applied via the movable carriage of the press.
  • the afore-mentioned, upstream cold forming stages for the pre-forming of the blank may be performed in a multi-stage press.
  • the pre-fabricated blank is then removed from the guide mold by means of a gripper and transported to the guide mold of the following processing station and inserted therein.
  • each of the three forming units I, II, III consists of a guide mold and the pertinent mold.
  • the split molds are preferably designed such that at least one axially displaceable wedge or cone-shaped element engages at the shell of the jaws, via which the closing and opening movement of the jaws is performed.
  • the method for cold forming according to the invention stands out due to high cost effectiveness since almost all working processes, in particular the forming of the shank, the head, and the helix, may be performed in a multi-stage press and no complex temperature management is required.
  • Another essential advantage of the present invention consists in that the drill bits or screws produced by means of the method according to the invention do not require any post-processing due to the cold forming. Rock drill bits may thus be produced without any further post-processing.
  • Another advantage lies in the particular hardness of the cold formed drill bits and screws since no structural change takes place due to the cold forming and the cold hardening, and the longitudinal alignment of the crystalline lattice arrangement is maintained.
  • Another advantage of the present invention in particular vis-à-vis known hot forming methods, consists in the tolerance and dimensional accuracy and the surface quality of the cold forming method.
  • a device suited for performing the method according to the invention comprises at least one cold forming unit consisting of a guide mold with a central opening for accommodating a blank, a split mold comprising at least two movable jaws that are adapted to be moved to an opening and a closing position, and an axially movable heading tool adapted to be inserted in the central opening of the guide mold.
  • the jaws of the split mold are fixed by a locking pressure variable in its intensity.
  • a locking pressure variable in its intensity.
  • the section with a contour designed as a negative for forming helical grooves which is positioned at the inner wall of the jaws may be of short length only, e.g. correspond to half a pitch or to the length of the section to be cold formed.
  • the bottom end of the split mold comprises a section with a strongly reduced pitch or without any pitch, for forming a flattened head on which a cutting tip can be fastened.
  • the method according to the invention may comprise further cold forming units destined to pre-form the blank.
  • one of the upstream cold forming units comprises a multi-part split mold with an inner contour for forming a flat section at the head of the blank.
  • the exit opening of the split mold is adapted to be closed by means of a counter tool to this end.
  • Another of the upstream cold forming units comprises a multi-part mold comprising an inner contour for modifying the cross-sectional shape of the section of the blank which is to be cold formed. It may, for instance, be flattened prior to the actual forming of the helical grooves.
  • the guide mold may be designed as one piece or be split in longitudinal direction, wherein the two parts are adapted to be moved in an opening and a closing position.
  • At least the cold forming unit consisting of guide mold, split mold, and heading tool and intended for forming the helical grooves is arranged in a multi-stage press with a stationary mold holder unit and a carrier that is adapted to be displaced in the direction of the mold holder unit.
  • At least one additional impact extrusion or compression mold should also be integrated in the multi-stage press.
  • the split mold consists preferably of a one or multi-part external ring in which the jaws are mounted to be displaced radially.
  • the shells of the jaws and the inner face of the ring are designed conically such that, on axial displacement of the ring or of the jaws, they are movable in the opening and closing position.
  • the split molds may also be equipped with a separate drive unit for the radial movement of the jaws in the closing and opening position.
  • the split mold may either be mounted on the mold holder unit or on the carrier of the multi-stage press.
  • the carrier or the mold holder unit is equipped with an actuator via which the radial displacement of the jaws is performed.
  • a shearing device and further extrusion or compression molds may be disposed in the multi-stage press.
  • FIG. 1 the individual method steps A, B, and C for the production of a spiral drill bit according to the invention in a chronological order, in simplified illustration,
  • FIG. 2 an enlarged sectional representation in accordance with line A-A of the embodiment shown as method step B,
  • FIG. 3 a second embodiment for the production of a spiral drill bit according to the invention as longitudinal section
  • FIG. 4 the individual method steps A, B, and C of a third embodiment for the production of a spiral drill bit, in a simplified illustration, as longitudinal section,
  • FIG. 5 the individual method steps A to G of a fourth embodiment for the production of a spiral drill bit, in a simplified illustration, as longitudinal section,
  • FIG. 6 the individual method steps A to F of a fifth embodiment for the production of a spiral drill bit, in simplified illustration, as longitudinal section,
  • FIG. 7 the individual method steps A to G of a third embodiment for the production of a spiral drill bit, in simplified illustration, as longitudinal section,
  • FIG. 8 the pre-formed blank in accordance with method step B in FIG. 7 .
  • FIG. 9 alternative embodiments for the production of a spiral drill bit according to the invention.
  • FIG. 1 illustrates in a simplified manner the three method steps A, B, and C for the production of a spiral drill bit 2 according to the invention, with a three-part split mold 3 , starting out from a blank 1 .
  • the three method steps A, B, and C are constituents of the cold forming stage III for producing the helical grooves 8 of the drill bit 2 .
  • the blank 1 consists of a section constituting the shank 11 and of the section 19 that is to be formed as helical grooves.
  • the blank 1 may, for instance, be designed as a cylindrical bar.
  • either an individual mold may be used, or the production is performed in a multi-stage press in which the blank 1 , starting out from a wire section that has been cut to length, is also pre-formed.
  • the multi-stage press that is not illustrated in detail comprises, in a per se known construction, a chassis with a displaceable carrier which are each equipped with mold holder units. Moreover, a shearing device and at least one impact extrusion or compression mold and a split mold 3 are arranged.
  • the mold halves or jaws are, by the movement of the carrier, moved in an opening or a closing position, and simultaneously the relative movement between the mold 3 and the heading tool 13 is triggered.
  • the wire that is fed as a starting material is cut to a predetermined length by means of a shearing knife that is not illustrated in detail, and the wire section that has been cut to length is positioned by means of a gripper or a transport device that is not illustrated in detail in front of the central opening 10 of the guide mold 9 and inserted therein by means of the heading tool 13 .
  • the central opening 10 may be seen only in the illustration of method step C. As the case may be, it may be necessary that the wire section is calibrated or pre-formed before being inserted in the guide mold 9 .
  • the split mold 3 is positioned directly after the guide mold 9 .
  • the split mold 3 consists of three jaws 4 , 5 , and 6 which are movable in radial and axial directions ( FIG. 2 ).
  • a section with a contour 7 which is designed as a negative is arranged for the forming of helical grooves 8 .
  • the contour-forming section 7 extends in radial direction only over part of the length of the drill helix to be formed. In particular applications it may also be expedient that the contour-forming section 7 is designed to be longer.
  • the length of the contour-forming section 7 results as a function of the pitch of the helix wherein, depending on the profile, only part of a 360° helix is necessary. Since the illustrated example is intended for the production of a simple spiral drill bit 2 with a constant outer diameter, a one-piece design of the mold 9 is completely sufficient. The diameter of the central bore or opening 10 of the mold 9 is only slightly larger than the outer diameter of the blank 1 (tolerance in the range of hundredths). The guide mold 9 is necessary to prevent a possible bending of the blank 1 during the pressing or forming process.
  • step A the split mold 3 is closed prior to the beginning of the cold forming process, the jaws 4 , 5 , and 6 are in contact with each other at their joint faces 12 .
  • the prefabricated, preferably cylinder-shaped, blank 1 is pushed by means of the heading tool 13 into the central opening 10 of the mold 9 until it gets into contact with the projecting mold inner contour 7 .
  • the heading tool 13 is subsequently impacted with the required pressure force in axial direction, said pressure force being sufficiently large to push or press, respectively, the blank 1 along the mold inner contour 7 through the central opening or the cavity 17 of the split mold 3 , wherein the blank 1 is plastically cold formed with helical grooves 8 being produced on the shell thereof (method step B).
  • a sufficiently high locking pressure is exerted on the jaws 4 , 5 , and 6 so as to prevent the jaws 4 , 5 , 6 of the split mold 3 from opening or being pushed apart due to the high mold pressure existing.
  • the blank is stretched or expanded, respectively, in longitudinal direction due to the plastical cold forming thereof.
  • the section 19 on which the grooves 8 are formed is slowly rotated independently about its longitudinal axis.
  • the helical grooves 8 are formed only along a predetermined section 19 of the blank. Once this has been reached, as is to be seen in method step B, the pressure force of the heading tool 13 and the locking force of the jaws 4 , 5 , 6 are driven towards zero, and they are opened as is illustrated in method step C.
  • the heading tool 13 is moved further in pressing direction.
  • the drill bit 2 may also be removed from the mold in some other manner, e.g. by means of a separate ejector that is moved in opposite direction.
  • the split mold 3 consists in the illustrated embodiment of an outer ring 14 which is adapted to be displaced in axial direction and in which the three jaws 4 , 5 , 6 are mounted to be moved radially.
  • the ring 14 is guided on a conical shell 15 of the jaws 4 , 5 , 6 which tapers in the direction of the opening movement, as is to be seen in method step C.
  • the ring 14 comprises a conical inner face 16 corresponding thereto.
  • the ring 14 For opening the split mold 3 , the ring 14 is moved in pressing direction. In the case of an arrangement in a multi-stage press, the movement of the ring 14 is triggered via an engagement element that is not illustrated in detail by the feed movement of the carriage of the multi-stage press, for opening and closing the jaws 4 , 5 , and 6 .
  • the opening and closing movement of the jaws 4 , 5 , and 6 may also be performed in some other kind and manner.
  • FIGS. 3 to 7 show various embodiment variants of drill bits which can be produced pursuant to the method according to the invention.
  • FIG. 3 shows a spiral drill bit 2 that differs from the drill bit illustrated in FIGS. 1 and 2 merely in that the upper section 11 a of the shank has a smaller diameter than the outer diameter of the helical section 19 .
  • the shank 11 a having a smaller diameter was already produced at the blank 1 in an up-stream pressing stage.
  • the forming of the helical section 19 is performed in analogy pursuant to the method steps A to C in FIG. 1 .
  • FIGS. 4 to 6 show spiral drill bits 2 with a flattened section 20 at the head end which is designed free of grooves. At this section 20 , cutting tips are subsequently fastened as hard metal inserts. As will be explained in the following, the production of these drill bits may take place in different manners.
  • FIG. 4 shows the method steps A “charging of the mold”, B “cold forming of the blank”, and C “ejecting/removing of the produced drill bit” for the production of a spiral drill bit 2 the tip or head 20 of which is flattened.
  • the shank 11 and the helical section 19 have similar outer diameters.
  • the jaws 4 , 5 , 6 of the split mold 3 and their inner contour 7 are designed in a different manner.
  • the jaws have the same length as the helical section 19 including the tip 20 .
  • the inner contour of the bottom section of the jaws is designed such that a flattened tip 20 is formed. Above this section the jaws 4 , 5 , 6 are designed with a helical inner contour 7 over the entire lengths thereof.
  • the blank 1 is pressed into the cavity of the split mold 3 by means of the header tool 13 (method step B), wherein the flattened tip 20 and the helical section 19 are formed by plastical deformation (method step B).
  • the split mold 3 is opened and the drill bit 2 is ejected by means of a separate ejector 23 in a direction opposite to the pressing direction (method step C).
  • the method steps A to C are constituents of the cold forming stage III.
  • the preferably cylindrical blank 1 is initially cold formed in a separate two-piece mold 18 (first mold) such that the bottom part 19 a of the section 19 that has to be cold formed has a smaller diameter than the other part of this section 19 .
  • the blank 1 inserted into the guide mold 9 (method step A) is, by means of the header tool 13 , pressed into the cylindrical cavity 18 a of the mold 18 which has a smaller diameter (method step B).
  • the method steps A and B constitute an upstream cold forming stage I.
  • the outer diameter of the cold formed section 19 a is dimensioned such that the jaws 4 , 5 , 6 of the subsequently added split mold 21 (second mold) may be closed without any problems without getting into contact with the shell of the section 19 a.
  • the following cold forming stage II (method steps C and D) is performed on the next station of the multi-stage press.
  • a split mold 21 is used, the mold inner contour 7 of which is designed such that a helical groove or spiral section 8 a and a flattened (non-helical) section 20 are produced (method step D).
  • the central opening of the split mold 21 is closed by a counter tool 22 from the bottom.
  • the heading tool 13 presses on the blank 1 with the necessary pressure force.
  • the bottom part 19 a of the blank 1 is deformed such that a short helical groove or spiral section 8 a and a flattened section 20 are formed.
  • the blank is compressed until the mold cavity has been completely filled.
  • the counter tool 22 prevents a pushing through of the blank 1 .
  • the pre-formed blank is taken out of the guide mold 9 by means of a gripper, transported to the next station, the cold forming stage III, and inserted in the guide mold 9 belonging to this station.
  • the structure of the third split mold 3 used in the cold forming stage III corresponds to that of the split mold 3 illustrated in FIG. 1 .
  • the jaws of the third split mold 3 are of such length or height, respectively, that they encompass in the closed condition only the helical groove section 8 a (method step E).
  • the head 20 of the blank 1 projects from the mold 3 .
  • the jaws have a helical inner contour 7 in analogy to the split mold 3 illustrated in FIG. 1 .
  • the blank 1 is now pressed through the mold opening by means of the heading tool 13 , and in this process helical grooves 8 are produced on the remaining part of the section 19 .
  • the split mold 3 is opened and the spiral drill bit 2 is ejected by further movement of the heading tool 13 in pressing direction (method step G).
  • the individual cold forming stages I, II, and III are each performed in a separate cold forming unit consisting of a guide mold 9 and the respective mold 18 , 21 , 3 .
  • a cylindrical metal rod is used as a blank 1 . It is pressed into a split mold 21 by means of the heading tool 13 , said split mold 21 being designed in analogy to the split mold 21 of FIG. 5 with a counter tool 22 .
  • the method steps A and B constitute the cold forming stage II, and the method steps C to E constitute the cold forming stage III.
  • the method steps B to E correspond to the method steps D to G illustrated in FIG. 5 .
  • the head of the produced spiral drill bit 2 also has a flattened section 20 .
  • the split molds 21 and 3 are designed in analogy to that of FIG. 5 .
  • the cylindrical blank 1 is, in an upstream pressing stage (cold forming stage I) by means of a mold 18 , deformed such that the section 19 that is to be equipped with drilling dust grooves is flattened, i.e. has a slot-type cross-sectional shape, as is illustrated in FIG. 8 .
  • the preferably cylindrical blank is given the desired shape, as is illustrated in FIG. 8 , by means of the heading tool 13 by impact extrusion.
  • the pre-formed blank 1 is taken out of the guide mold 9 of the cold forming stage I and fed to the guide mold 9 of the following station (cold forming stage III).
  • the pre-formed blank 1 is, pursuant to the method step D, pressed by means of the heading tool 13 through a split mold 3 that is designed in analogy to the split mold illustrated in FIG. 1 . Due to the—already performed—cross-section reduction of the section 19 that has to be cold formed, smaller forming forces are required to form the drilling dust grooves.
  • the produced spiral drill bit 2 has a constant outer diameter, from the shank to the head. The removal of the drill bit 2 from the mold is then performed in analogy to the above explanations.
  • the cross-sectional shape in the section 19 is, as shown in FIG. 9 , pre-profiled.
  • a pre-profile has a polygon cross-section, it may in particular be, for instance, a triangle, a square (see sections AA and BB), a hexagon (see section CC) or an octagon (not illustrated).
  • polygon cross-sections of a star shape may be advantageous.
  • This pre-profile in the section 19 yields among others the advantage that during the production of the spiral the forces to be applied may be less than with circular cross-sections of a cylindrical blank.
  • the pre-profile reduces the forces in the heading tool 13 by a volume pre-distribution of the material and thus also the circumferential forces acting on the jaws and molds.
  • the profiling it may be of advantage to match the number of the polygons to the number of the cutting edges and grooves.
  • the section that has not been formed to a spiral is, in method step CC, formed by means of cold forming, for instance, to a section that is suited to accommodate a drill bit in a drill chuck.
  • the entire blank is deformed in a cold forming pre-stage and, for instance, cold formed to a hexagonal cross-section.
  • the hexagonal pre-deformation of the entire blank has in particular the advantage that, due to the volume pre-distribution of the hexagonal section which has already been performed, the circumferential forces in the section that is deformed to a spiral may be smaller than with cylindrical cross-sections.
  • the section that is not cold formed to a spiral may be used as a clamping section for the later drill bit accommodation in the drill chuck.
  • This cold forming may be performed by means of jaws. It is also possible that the bar or wire-shaped starting material already has a polygon cross-section and that the blanks are not subject to any further cold forming.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Extrusion Of Metal (AREA)
  • Metal Extraction Processes (AREA)
US13/377,727 2009-06-12 2010-06-11 Method and device for producing longitudinal components of metal with helical grooves, in particular spiral drill bits or screws Abandoned US20120079918A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009025161 2009-06-12
DE102009025161.8 2009-06-12
PCT/EP2010/003533 WO2010142458A2 (fr) 2009-06-12 2010-06-11 Procédé et dispositif permettant de fabriquer des pièces en métal de forme allongée pourvues de rainures hélicoïdales, en particulier des forets hélicoïdaux ou des vis sans fin

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US (1) US20120079918A1 (fr)
EP (1) EP2440341B1 (fr)
JP (1) JP5688593B2 (fr)
KR (1) KR20120037467A (fr)
CN (1) CN102802827A (fr)
BR (1) BRPI1011106A2 (fr)
TW (1) TW201105437A (fr)
WO (1) WO2010142458A2 (fr)

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CN108436010A (zh) * 2018-01-23 2018-08-24 台州万特汽车零部件有限公司 螺旋齿冷锻机
US20190257208A1 (en) * 2018-02-20 2019-08-22 Novatek Ip, Llc Unitary Turbine Blade and Method of Manufacture Thereof
US11654465B2 (en) * 2018-02-27 2023-05-23 Kennametal Inc. Method for producing a blank from extrusion material, and extruder
US11857386B2 (en) 2021-10-25 2024-01-02 Prima Dental Manufacturing Limited Manufacture of a dental tool

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DE102009055748A1 (de) * 2009-11-26 2011-06-09 Südsta AG Verfahren zur Herstellung eines Bohrers
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CN102802827A (zh) 2012-11-28
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JP5688593B2 (ja) 2015-03-25
BRPI1011106A2 (pt) 2018-02-06
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JP2012529368A (ja) 2012-11-22
KR20120037467A (ko) 2012-04-19

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