EP1406741A1 - Outil de coupe rotatif, notamment foret - Google Patents

Outil de coupe rotatif, notamment foret

Info

Publication number
EP1406741A1
EP1406741A1 EP01978311A EP01978311A EP1406741A1 EP 1406741 A1 EP1406741 A1 EP 1406741A1 EP 01978311 A EP01978311 A EP 01978311A EP 01978311 A EP01978311 A EP 01978311A EP 1406741 A1 EP1406741 A1 EP 1406741A1
Authority
EP
European Patent Office
Prior art keywords
tool
clamping
tool head
fixing pin
fixing
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.)
Withdrawn
Application number
EP01978311A
Other languages
German (de)
English (en)
Inventor
Bernhard Borschert
Dieter MÜHLFRIEDEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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
Application filed by Kennametal Inc filed Critical Kennametal Inc
Publication of EP1406741A1 publication Critical patent/EP1406741A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/0002—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position
    • B23B51/0003—Drills with connected cutting heads, e.g. with non-exchangeable cutting heads; Drills with a single insert extending across the rotational axis and having at least two radially extending cutting edges in the working position with exchangeable heads or inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/02—Connections between shanks and removable cutting heads
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S408/00—Cutting by use of rotating axially moving tool
    • Y10S408/713—Tool having detachable cutting edge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/78—Tool of specific diverse material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9098—Having peripherally spaced cutting edges with means to retain Tool to support
    • Y10T408/90993—Screw driven means

Definitions

  • Concentric cutting tool e.g. drill
  • the invention relates to a concentric cutting tool, e.g. a drill, a milling cutter, a reamer or the like. with the features of the preamble of claim 1.
  • solid carbide drills are regularly manufactured in one piece. With them the drill tip and the drill shank are not separable.
  • drills are also known in which a solid carbide cutting body is soldered into the shaft or in which the solid carbide cutting body is detachably connected to a steel shaft.
  • the one-piece tool head is clamped between the flanks of two clamping arms which protrude in the axial direction from the tool shank made of tool steel.
  • This combination drill with a steel shank and exchangeable hard metal tip can only be easily manufactured for larger drill diameters of> 10 mm.
  • One problem in particular is ensuring adequate tool change and concentricity.
  • the tool head is tensioned via a fastening pin attached to the drill head and concentric with the drill axis, through which a cutting insert forming the tool head is concentric in a pin receptacle of the tool shaft is held.
  • the fastening pin is undercut in the pin circumference so that it can be inserted laterally into the pin receptacle from the flute.
  • the cutting insert with the fastening pin that is integral with it is turned in the manner of a bayonet connection against the direction of rotation until the contact surfaces provided on the fastening pin contact the corresponding contact surfaces of the pin receptacle.
  • the desired frictional clamping of the cutting insert is brought about in that the jacket of the fastening pin has undercut contact surfaces in the pin circumference.
  • the cutting insert is held against the cutting forces by the rear wall and the edge of the shaft on which it is received. agreed holder recess supported. The cutting forces push the cutting insert into its seat so that it is fixed without additional fasteners. This eliminates the need for a complicated and time-consuming fastening screw to replace the cutting insert.
  • the undercut in the s circumference of the pin impairs the desired concentricity.
  • the invention has for its object to provide a concentric cutting tool of the type mentioned, which can be easily manufactured even for drill diameters smaller than 10 mm and has a high degree of change and concentricity 10.
  • This object is achieved according to claim 1.
  • the solution is that the mutual clamping surfaces of the tool, which contact each other in the fixing position, and the clamping arm of the tool shaft lie on the surface of a truncated cone coaxial with the longitudinal axis of the tool shaft tapered towards the machine tool clamping end of the tool shank.
  • the tool head with the loaded conical surface areas of its fixing pin projecting in the direction of insertion rests similar to the Kömerspitze of the tailstock of a lathe. 20
  • the angle of inclination of the conical surface of the locating pin with respect to the shaft axis is approximately 3 °. It is in particular a cone with a 1:10 inclination ratio.
  • the base circle diameter of the conical shape of the fixing pin of the tool head is 25 smaller than the radial extent, in particular as the diameter of the base body of the tool head.
  • Clamping arm as an axial stop.
  • the clamp arms spring apart slightly elastically in the axial stop position of the tool head. This supports the frictional active clamping effect of the tapered jacket surfaces of the clamping arm on the pressurized clamping surfaces of the fixing pin of the tool head.
  • the frictional connection between the tapered clamping surfaces of the tool head on the one hand and the tool shank or its clamping arm on the other hand is sufficient for torque transmission, in particular in the case of small drill diameters.
  • at least one driver surface is provided in the area of an axial end of the clamping cone of the tool head for an also positive torque transmission from the tool shaft to the tool head.
  • This driver surface touches a corresponding counter surface on the tool shank in the fixing position of the tool head.
  • At least two mutually parallel driver surfaces are expediently provided diametrically opposite one another on the tool head, which correspond to corresponding driver surfaces of the tool shaft when the tool head is in the fixing position on the tool shaft.
  • An embodiment according to claim 3 is advantageous.
  • driver surface or driver surfaces for the additional positive torque transmission can also expediently be parts of a tab placed in front of the tapered clamping cone end in the insertion direction, which corresponds to a recess at the end of the tool shank suitable for the corresponding torque transmission (claim 5).
  • a clamping fixing screw penetrating the clamping arm and the tool head or its fixing pin, a bolt, a spiral spring pin, a rivet or the like.
  • a torque driver also causes an increase in the forceps-like clamping fixation pressure acting on the cone clamping surfaces on the part of the clamping arm of the tool shaft.
  • This means for driving torque or for increasing the radial clamping fixing pressure expediently lies in a through hole penetrating the clamping cone radially (claim 8).
  • clamping fixing screw or the like it is also possible for the clamping fixing screw or the like to lie in a diametrically longitudinal slot groove which penetrates the clamping cone radially and is open towards the tapered clamping cone end (claim 9). This makes it easier to replace the tool head.
  • a releasable snap connection which is activated in the fixing position of the tool head, for an axially effective, form-fitting fixing of the tool head to the tool shaft.
  • the physical design of such a snap connection is the subject of claim 11.
  • a snap nub is part of the cone shell or the driver area adjacent to the cone shell in the axial direction and the counter surface of the snap nub is part of the tool shank or its clamp arm or vice versa a snap nub part 0 of the tool shank and the recess as a counter surface is part of the tool head.
  • the flute of the cutting tool runs in the fixing position, e.g. the twist groove of the drill in the space between the clamp arms.
  • the bottom of the flute is s recessed into the surface of the fixing pin, which has no passive clamping function in the space between the clamping brackets (claims 12 and 13) but is fully effective for chip guidance that is open radially outwards.
  • FIG. 1 shows the overall view of a drill with a tool head made of a hard cutting material, e.g. HM. 2 a side view isolated of the tool head according to FIG. 1.
  • FIG. 3 a detailed view of the drill tip in the direction of arrow III from FIG. 1 and FIG. 2.
  • FIG. 4 a perspective exploded view of the end of the tool shaft on the tool head side and of the tool head in their for the mutual fixing insert suitable or ready rotary positions.
  • 5 shows an overall perspective view of the tool shank with the tool head used in the production of a clamping film.
  • Fig. 6 is an overall perspective view of the fixing end of another embodiment of the tool head.
  • 7 shows a side view of the tool head according to FIGS. 4, 5 and 6.
  • 8 is a side view of the complete drill with the tool head seated in the clamping fixation position on the tool shank.
  • FIG. 9 is a sectional view corresponding to arrow IX-IX in FIG. 8.
  • FIG. 10 is a front view of the drill tip in the direction of arrow X of FIG. 8.
  • FIG 11 is a side view of a modified embodiment of the tool head.
  • FIG. 12 is a side view - partly in section - of a tool shank suitable for receiving the tool head according to FIG. 11.
  • FIG. 13 shows the side view of a drill tip with the tool head seated in the clamped fixing position.
  • FIG. 14 shows the side view - partly in section - of the tool shank according to FIG. 12 with the tool head according to FIG. 11 seated in the clamping fixing position.
  • FIG. 15 is a side view in the direction of arrow XV of the drill according to FIG. 14.
  • 16 shows the schematic side view of a modified embodiment of the tool head.
  • FIG. 17 shows the side view of the tool-side end of the tool shaft for receiving the tool head designed according to FIG. 16.
  • the drill shown as an exemplary embodiment of a concentric cutting tool • contains as essential components a tool head 1 made of a hard
  • Cutting material e.g. Hard metal, oxide ceramic or the like.
  • a tool shank 2 made of a tool steel or another metallic material.
  • the tool head 1 is the carrier of the cutting edges 3. From the side of its base body 5 facing away from the tip 4 and facing the tool shaft 2, there projects a fixing pin 7 coaxial with the longitudinal tool axis 6, which also has a truncated cone 8 tapering in the direction of the tool shaft 2 the longitudinal axis 6 forms as a cone axis.
  • the two swirl grooves 9 extend over the circumference of both the base body 5 and its fixing pin 7. They therefore divide the jacket of the fixing pin 7 or the truncated cone 8 into two substantially diametrically opposed truncated cone surfaces 10, 11 and continue on the circumference of the tool shank 2.
  • the tool shaft 2 interchangeably fixes the tool head 1 at its holding end opposite the clamping end 12 on the machine tool between the mutually facing flanks of the two clamping arms 13, 14 projecting essentially in the axial direction from the tool shaft 2.
  • the diametrically opposed truncated cone outer surfaces 10, 11 of the fixing pin 7, which are separated from one another in the circumferential direction by the two swirl grooves 9, are acted upon in the clamping position by the mutually facing flanks of the two clamping arms 13, 14 of the tool shank 2.
  • the mutually facing inner flanks 15, 16 of the clamping arms 13, 14 are correspondingly concavely hollowed out in accordance with the convex truncated cone outer surfaces 10, 11 of the fixing pin 7 such that they are in the fixing position (FIGS. 1, 3, 5, 8, 9, 14 and 15) Apply the full surface of the truncated cone outer surfaces 10, 11 of the fixing pin 7.
  • the axial direction of insertion 17 of the tool head 1 in the tool shank 2 is indicated by an arrow.
  • the passive truncated cone surfaces 10,11 of the fastening pin 7 of the tool • head 1 or the cone described by them have a base diameter which is smaller than the radial extension or the diameter 18 of the base body 5 of the tool head 1. This forms the transition from the base body 5 to the fixing pin 7 between the swirl grooves 9 pronounced axial stops 19. With the two axial stops 19, the tool head 1 lies in the fixing position on the end faces 20 of the clamping arms 13, 14 facing it.
  • the tool head 1 has at least one radially effective driver surface 21 and / or 22 for positive torque transmission from the tool holder 2 to the tool head 1.
  • This driver surface 21 or 22 touches, ie acts upon, a corresponding counter surface on the tool shaft 2 in the fixing position of the tool head 1.
  • the driver surface 22 is located in the region of the tapered fixing pin end 23 and is placed in front of it in the direction of insertion 17. Both driver surfaces 21, 22 are designed and effective as flat surfaces in the manner of a wrench size.
  • the driver surface 22 is part of the circumference of a driver pin 24, which is placed in front of the tapered fixing pin or clamping cone end 23 in the direction of insertion 17.
  • the driver pin 24 is torque-locked into the central recess 25 at the clamping end of the tool shank 2 between the two clamping arms 13, 14.
  • the driver surfaces 22 press-fit the counter-surfaces 31 flanking the central recess 25 on both sides below the cone-shaped concave inner flanks 15, 16 of the two clamping arms 13, 14.
  • the clamping fixing screw 26 not only establishes a positive connection between the clamping brackets 13, 14 and the fixing pin 7. Rather, it further increases the radial, pincer-like clamping fixing pressure exerted by the clamping arms 13, 14 on the truncated cone lateral surfaces 10, 11 of the driving pin 24.
  • the clamping fixing screw 26 lies in a through hole 27 which penetrates radially through the fixing pin 7.
  • the clamping fixing screw 26 lies within a diametrically longitudinal slot groove 28 which penetrates the fixing pin 7 radially and is open towards the tapered fixing pin end 23.
  • a releasable snap connection is present in the fixing position of the tool head 1 on the tool shaft 2.
  • the snap connection contains, with the cone jacket or a truncated cone jacket surface 10 or 11, integral, diametrically opposed snap knobs 29.
  • the snap knobs 29 of the fixing pin 7 snap into corresponding recesses on the inner flanks 15, 16 of the clamping arms 13, 14 as a counter surface ,
  • the swirl grooves 9 lie in the space between the two clamp arms 13, 14. As a result, they are completely exposed to the circumference of the drill and are therefore not hindered or restricted in their action as flutes.
  • the bottom of the swirl grooves 9 is concavely formed in the truncated cone outer surfaces 10, 11 of the fixing pin 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Gripping On Spindles (AREA)

Abstract

L'invention concerne un outil de coupe rotatif, notamment un foret, qui comprend une tête d'outil (1) fabriquée dans un matériau de coupe dur et une tige d'outil (2) fixant par serrage la tête d'outil (1) de manière amovible entre deux parties saillantes de serrage (13, 14) faisant saillie dans le sens axial de la tige d'outil (2). En position de fixation, les surfaces de serrage, en contact entre elles, de la tête d'outil (1) et des parties saillantes de serrage (13, 14) de la tige d'outil (2) sont placées sur la gaine d'un tenon de fixation tronconique (7) qui est coaxial à l'axe longitudinal (6) de la tige d'outil (2) et qui s'effile dans le sens d'insertion (17) orienté vers l'extrémité d'insertion (12) de la tige d'outil (2).
EP01978311A 2000-09-01 2001-08-29 Outil de coupe rotatif, notamment foret Withdrawn EP1406741A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10042990A DE10042990A1 (de) 2000-09-01 2000-09-01 Rundlauf-Schneidwerkzeug, z. B. Bohrer
DE10042990 2000-09-01
PCT/EP2001/009916 WO2002018082A1 (fr) 2000-09-01 2001-08-29 Outil de coupe rotatif, notamment foret

Publications (1)

Publication Number Publication Date
EP1406741A1 true EP1406741A1 (fr) 2004-04-14

Family

ID=7654553

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01978311A Withdrawn EP1406741A1 (fr) 2000-09-01 2001-08-29 Outil de coupe rotatif, notamment foret

Country Status (6)

Country Link
US (3) US7048480B2 (fr)
EP (1) EP1406741A1 (fr)
JP (1) JP2004507373A (fr)
AU (1) AU2002210466A1 (fr)
DE (1) DE10042990A1 (fr)
WO (1) WO2002018082A1 (fr)

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US20030219321A1 (en) 2003-11-27
US20080181741A1 (en) 2008-07-31
JP2004507373A (ja) 2004-03-11
US7591617B2 (en) 2009-09-22
US7048480B2 (en) 2006-05-23
WO2002018082A1 (fr) 2002-03-07
DE10042990A1 (de) 2002-03-28
US7306410B2 (en) 2007-12-11
AU2002210466A1 (en) 2002-03-13
US20060245836A1 (en) 2006-11-02

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