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WO2011089190A1 - Procédé et dispositif de production de structures de doigt - Google Patents

Procédé et dispositif de production de structures de doigt Download PDF

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Publication number
WO2011089190A1
WO2011089190A1 PCT/EP2011/050773 EP2011050773W WO2011089190A1 WO 2011089190 A1 WO2011089190 A1 WO 2011089190A1 EP 2011050773 W EP2011050773 W EP 2011050773W WO 2011089190 A1 WO2011089190 A1 WO 2011089190A1
Authority
WO
WIPO (PCT)
Prior art keywords
milling
groove
grooves
discs
finger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2011/050773
Other languages
German (de)
English (en)
Inventor
Josef Scherer
Frank Scherer
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.)
Scherer and Partner Engineering Ltd & Co KG
Walter AG
Original Assignee
Scherer and Partner Engineering Ltd & Co KG
Walter AG
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 Scherer and Partner Engineering Ltd & Co KG, Walter AG filed Critical Scherer and Partner Engineering Ltd & Co KG
Publication of WO2011089190A1 publication Critical patent/WO2011089190A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/08—Disc-type cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/28—Grooving workpieces
    • B23C3/30—Milling straight grooves, e.g. keyways
    • B23C3/305—Milling straight grooves, e.g. keyways in which more than one milling tool is used simultaneously, e.g. for sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/24—Overall form of the milling cutter
    • B23C2210/244—Milling cutters comprised of disc-shaped modules or multiple disc-like cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2220/00—Details of milling processes
    • B23C2220/36—Production of grooves
    • B23C2220/366—Turbine blade grooves

Definitions

  • the present invention relates to a method and an apparatus for producing finger structures on a workpiece by milling grooves or groove flanks and optionally folding in the workpiece by means of a disk cutter, wherein a finger profile arises between the grooves according to their spacing.
  • the present invention seeks to provide a method and an apparatus for generating finger structures with the features mentioned, which makes a considerable simplification when switching to different Nutumblen and a significant reduction in tooling costs and also the set-up times possible - chen.
  • the milling disc After the groove has been made in this way initially with a narrower profile, the milling disc is axially moved so far that when immersed in the workpiece and the opposite edge is prepared with the measures provided for this stage processing target size. If necessary, if the groove width is more than twice the width of the milling cutter profile, the disk milling cutter would also have to carry out more than two milling operations to produce a groove by progressively expanding the originally produced groove by slightly less than the width of the profile of the disk milling cutter until in a final milling step, the nominal dimension of the groove flank lying opposite the first groove flank is achieved.
  • a plurality of grooves or groove flanks are generated simultaneously in parallel, d. H.
  • several identical side-milling cutters can be used together on a mandrel with a center distance that corresponds to the center distance of the grooves to be generated or the center distance of the fingers produced thereby from a finger structure.
  • the milling discs can either be delivered radially or tangentially, in which case the center of the milling disc is moved in the direction of the groove base (radial infeed) and in the other case the milling cutter axis is moved parallel to the groove base to be produced.
  • the latter method may be particularly preferred when large changes in torque during processing of the workpiece to be avoided, since at a tangential delivery, the cutting edges initially only over a relatively small angle sector away with the workpiece engaged, then gradually up to increases a maximum value, so that the required torque gradually increases accordingly, while in the radial feeding by engaging the cutting edges with the workpiece strength torque changes are expected.
  • first a groove or a plurality of grooves or their groove flanks are produced, wherein in each case one flank of a groove or the plurality of flutes corresponds to a nominal dimension, while the opposite flank produced thereby deviates from its nominal dimension , whereupon subsequently at least one further milling passage takes place at the same or the same grooves, in which the milling disc (s) is (are) offset axially relative to the first milling passage by an amount corresponding to the deviation of in the first milling passage generated opposite edge of their nominal size corresponds, so that one of the flanks first generated new new flank with the intended nominal size arises.
  • roughing discs and sizing discs could be mounted on the same mandrel so that they can be brought into their respective working position simply by axial displacement of the workpiece or mandrel parallel to the axis of the mandrel.
  • the cutting blade or milling blade discs for finishing can be engaged in the same processing step with a workpiece on which a roughing milling operation has previously been carried out, while at the same time a corresponding Schruppfräsvorgang is performed on a new workpiece.
  • the cutting profiles of the milling disks for the finishing process have a width which is twice as large as the cutting edge profiles of the roughing disks, the allowance being the difference between the position of a groove flank after roughing and the final dimension of this groove flank.
  • additional milling discs or milling stations can additionally be interposed or connected downstream, which can process, for example, bevelled transitions of a gradation of the groove flanks or the corner radii of the groove base.
  • the object underlying the invention is achieved in that the machine independently along the three mutually perpendicular axes of the NC machine independently movable, and its own Has axis rotatable mandrel for receiving at least one set of multiple parallel Fräsamperedn.
  • the plurality of parallel cutting discs both similar milling discs, d. H. Washers for roughing or discs for finishing or discs for the treatment of transitions, as well as discs for different processing tasks be such.
  • the mandrel has a plurality of sets of a plurality of parallel milling discs, wherein the cutting discs of each set have the same axial center distance from each other. It is preferred if each set of cutting disks has at least three or more cutting disks, wherein the distances between adjacent cutting disks are the same.
  • FIG. 2 shows a disk milling cutter according to the prior art with a plurality of cutting disks for finishing a profile according to FIG. 1, FIG.
  • FIG. 3 shows schematically a turbine blade which is clamped in a tensioning device and the side view of a milling disk for the tangential feed to the blade root
  • FIG. 4 shows a set of cutting disks according to the invention on a common mandrel in a longitudinal sectional view and in a side view
  • FIG. 1 shows a radially inner end portion of a turbine blade, wherein the turbine blade is shown broken away, while the turbine finger foot is substantially completely reproduced.
  • the turbine finger base shown here consists of four fingers with stepped grooves intersected therefrom, which have been milled out of a truncated block shaped as one piece with the turbine blade.
  • the associated turbine hub has in each case a plurality of parallel circular disks whose profile, as seen in an axial section, corresponds to the cross-sectional profile of the grooves 3, wherein two outer circular disks have a corresponding flank profile only on one side and the outer fingers 2a and 2d of the turbine finger base according to FIG to capture.
  • Mutually aligned bores 4 both in the fingers 2a to 2d of the turbine finger base 2 and in the parallel circular disks of a turbine hub serve the positionally accurate and rigid attachment of the Turbinenblattfinger- foot 2 on the corresponding hub disks or the hub of a turbine wheel.
  • Fig. 2 shows a conventional disc milling cutter, as used for example for the production of the final profile of the turbine finger base according to Fig.
  • the cutting edge contour indicated by the cross section of the cutting disks that is to say the projection of the cutting edge profile of the cutting inserts mounted on the milling disks into a common plane containing the axis, exactly corresponds to the profile of the grooves 3.
  • FIG. 3 also shows a corresponding tensioning device 30 together with a cutting disc set 42 according to the present invention.
  • the corresponding set of cutting wheels will be described in more detail in connection with the following figures, but has a similar basic structure as the Frässchibensatz of Fig. 2, i. it consists of several parallel milling discs.
  • the tensioning device 30 consists of a base plate 31 on which a blade head clamping unit 32 and a Schaufelfußspannech 35 are mounted.
  • a foot support 34 is additionally provided for the finger 2.
  • the blade head clamping unit also includes a blade cover sheet 32, which receives the free end of a turbine blade 1 and holds. With the help of the blade cover sheet a clear orientation of the blade 1 is ensured with respect to the position and the course of the finger grooves 3 in the finger 2, wherein the grooves are preferably made by a tangential feed of the disc cutter 42.
  • the maximum depth T of the grooves that can be made with such a side milling cutter corresponds to the difference in diameter between the outer diameter of the Frässcalen, more precisely, the circumferential radius of the outermost cutting, and an inner collar of the mounted on a mandrel 41 Frässcalen 42, 43.
  • All turbine blades are manufactured in exactly the same set-up, so that all turbine blades after completion coincide identically, ie in particular the position and orientation of the fingers of the finger base 2 with respect to the orientation of the turbine blade 1 is identical for all blades.
  • FIG. 4 shows a milling device according to the invention, which consists of a mandrel 41, on which one or more Scheibenfräser algorithms 42, 43 may be mounted, in the present case between roughing cutters 42 and finishing cutters 43 is distinguished and the finishing cutters 43 in turn still in cutter 43 a, 43b and 43c, which will be described in more detail below.
  • the individual Frässcalen and Scheibenfräser algorithms be determined by appropriate spacers, which may optionally be adjustable to a certain, by the geometry of the finger feet and the arrangement of the individual workstations of a three-axis milling machine on which these tools are arranged.
  • the right part of Fig. 4 is an end view of a corresponding set of disk cutters.
  • the mandrel 41 is held by a plurality of support bearings 44 on a tool intermediate carrier 45 and can be brought into engagement with a corresponding drive unit of the milling machine, whereby the mandrel together with the cutting discs 42, 43 is rotated about its axis 47 in rotation.
  • Fig. 5 illustrates the essential characteristics of a finger milling disc and the grooves made therewith.
  • FIG. 5 shows the profile of a disk cutter whose cutting width SBA corresponds to the width of the indexable insert plus a width addition BZ, wherein the width addition is smaller than the plate width and highest corresponds to the plate width minus twice the axial dimension of a corner radius or a Eckenabschrägung ,
  • the entire cutting width of the milling disk is formed by two plates or two rows of cutting plates arranged along the circumference of the milling disk, which occupy respectively equivalent positions at the corners of the milling disk profile within a row.
  • FIG. 5 shows the grooves to be produced with a given milling cutter profile, wherein the minimum groove width NGBK is predetermined by the cutting edge contour of the cutting disks arranged on the circumference of the milling cutter.
  • Fig. 6 illustratively shows the method of accurately setting a set of cutting wheels on a corresponding three-axis NC machine.
  • a set of three cutting discs 42 is moved up to the left, right and central outer contours of the finger foot block 2, in which the grooves 3 to be produced are shown in broken lines.
  • the rightmost cutter disk or its radial cutting edges When approaching from the left of the finger base block 2, the rightmost cutter disk or its radial cutting edges first comes into contact with the finger base block 2, wherein the position reached when this contact occurs is registered for the corresponding axis of the NC machine.
  • the cutting edges of the leftmost milling discs first come into contact with the finger-foot block 2, and again the position of the respective axis reached when the contact first appears is registered and stored.
  • a first step a the three cutting discs 42 are positioned so as to form, on the finger-foot block 2, the contour formed by black, solid lines, i. two corresponding grooves and a fold on the outside of the finger base block 2, produce.
  • two further grooves and one fold are milled out again on the outside, whereby in FIG. 7b the contour previously produced in step a is also clearly recognized on the basis of the solid black lines.
  • step c the three milling discs again pass through the region of the grooves produced in step a, but offset by an axial difference, to produce the correspondingly wider, outer groove portion of the finger foot profile.
  • step d the only weakly formed in step a fold on the outside of the left finger is deepened in the axial direction.
  • step d a broadening of the grooves produced in step b is carried out analogously, it being possible to clearly recognize in the partial image d the wider grooves produced in step c on the basis of the solid lines.
  • the fold on the outside of the right finger had already received the necessary axial depth in step.
  • the profile produced in steps a to d is finally reproduced in Fig. 7e.
  • the deeper and narrower groove sections are then produced in a further four steps, wherein here too all the left flanks of the grooves and the one fold on the right side are produced stepwise (steps f and g ), while in steps h and i the milling cutter is again displaced to the right (compared to the offset from step a to c) to the right in order to produce the final groove contour and thus also the final finger structure according to FIG. 7k.
  • steps f and g the milling cutter is again displaced to the right (compared to the offset from step a to c) to the right in order to produce the final groove contour and thus also the final finger structure according to FIG. 7k.
  • FIG. 8 shows another variant of finish milling, which, however, could in principle also be used for roughing in this form.
  • two milling disks 43 are set so that the clear distance between their cutting edges corresponds exactly to the width of the end member of the respective fingers and the cutting disks each move beyond the fingers previously made with a certain allowance to the final width of the end members of the fingers manufacture.
  • Fig. 9 shows a variant of a sizing process in which the two cutting discs 43 are set with their cutting to a distance corresponding to the pitch of the end members of the fingers.
  • a first pass left partial image of FIG. 9
  • the left-side surfaces of the fingers are produced and then in the second step (right partial image of FIG. 9) the right-sided flanks.
  • Fig. 10 shows a corresponding finishing operation with a single milling disc, which successively brings the left and right flanks of each individual finger to final dimensions.
  • the arrangement of all the cutting discs on a single mandrel has the advantage that the finger blade of the turbine blade can pass through all the milling operations in the same setup sequentially, allowing production with the lowest possible tolerance deviations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Abstract

L'invention concerne un procédé de production de structures de doigt sur une pièce par le fraisage de rainures ou de flancs de rainures dans la pièce à l'aide d'une fraise à disque, un profil de doigt apparaissant entre les rainures conformément à leur écart. L'invention vise à mettre au point un procédé et un dispositif de production de structures de doigt qui présentent les caractéristiques décrites ci-dessus et permettent de simplifier considérablement le réglage selon différentes largeurs de rainure et de réduire considérablement les coûts d'outillage et les temps de préparation. A cet effet, une fraise à disque dont le contour de coupe présente une largeur inférieure à celle des rainures à produire est utilisée pour produire les rainures.
PCT/EP2011/050773 2010-01-21 2011-01-20 Procédé et dispositif de production de structures de doigt Ceased WO2011089190A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001083.9 2010-01-21
DE102010001083A DE102010001083A1 (de) 2010-01-21 2010-01-21 Verfahren und Vorrichtung zum Fingerfräsen

Publications (1)

Publication Number Publication Date
WO2011089190A1 true WO2011089190A1 (fr) 2011-07-28

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PCT/EP2011/050773 Ceased WO2011089190A1 (fr) 2010-01-21 2011-01-20 Procédé et dispositif de production de structures de doigt

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WO (1) WO2011089190A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108526560A (zh) * 2018-04-18 2018-09-14 阿坝铝厂 一种铝母排专用铣床
CN112091298A (zh) * 2020-09-16 2020-12-18 中国航发贵州黎阳航空动力有限公司 直槽加工刀具及加工方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113268038B (zh) * 2021-07-19 2021-10-12 广州中望龙腾软件股份有限公司 基于平行铣削的刀轨排序方法、智能终端以及存储装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614558A (en) * 1921-09-30 1927-01-18 Westinghouse Electric & Mfg Co Method of cutting elemental slots in cylindrical bodies
JPS60165110U (ja) * 1984-04-11 1985-11-01 株式会社東芝 組合せ側フライス
EP0700744A1 (fr) * 1994-09-07 1996-03-13 Walter Ag Fabrication et fraise de rainures profondes, spécialement pour roteur de génératrices et turbines
DE19611276C1 (de) * 1996-03-22 1997-03-20 Walter Ag Zerspanungswerkzeug und Verfahren zur Herstellung von hinterschnittenen Nuten
EP0827807A1 (fr) * 1996-09-04 1998-03-11 Kawasaki Jukogyo Kabushiki Kaisha Dispositif et procédé d'usinage de barres longues
DE10245197A1 (de) 2002-09-27 2004-04-08 Walter Ag Verfahren und Vorrichtung zum Herstellen von Gabelfüßen von Turbinenschaufeln
DE102008013716A1 (de) * 2008-02-29 2009-09-03 Chiron-Werke Gmbh & Co Kg Werkzeugmaschine, insbesondere zum Turbolader-Verdichterradfräsen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020033A1 (de) * 2005-04-29 2006-11-02 Mtu Aero Engines Gmbh Fräswerkzeug und Verfahren zum Fräsen von Vertiefungen
DE102007033329B4 (de) * 2006-08-04 2009-04-23 Sew-Eurodrive Gmbh & Co. Kg Verfahren und Vorrichtung zum Verlegen von Linienleitern, Verfahren zum Anfasen von Ausnehmungen, Vorrichtung und Verfahren zur Herstellung von mehrstufigen Sackloch-Bohrungen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614558A (en) * 1921-09-30 1927-01-18 Westinghouse Electric & Mfg Co Method of cutting elemental slots in cylindrical bodies
JPS60165110U (ja) * 1984-04-11 1985-11-01 株式会社東芝 組合せ側フライス
EP0700744A1 (fr) * 1994-09-07 1996-03-13 Walter Ag Fabrication et fraise de rainures profondes, spécialement pour roteur de génératrices et turbines
DE19611276C1 (de) * 1996-03-22 1997-03-20 Walter Ag Zerspanungswerkzeug und Verfahren zur Herstellung von hinterschnittenen Nuten
EP0827807A1 (fr) * 1996-09-04 1998-03-11 Kawasaki Jukogyo Kabushiki Kaisha Dispositif et procédé d'usinage de barres longues
DE10245197A1 (de) 2002-09-27 2004-04-08 Walter Ag Verfahren und Vorrichtung zum Herstellen von Gabelfüßen von Turbinenschaufeln
DE102008013716A1 (de) * 2008-02-29 2009-09-03 Chiron-Werke Gmbh & Co Kg Werkzeugmaschine, insbesondere zum Turbolader-Verdichterradfräsen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108526560A (zh) * 2018-04-18 2018-09-14 阿坝铝厂 一种铝母排专用铣床
CN108526560B (zh) * 2018-04-18 2020-05-22 阿坝铝厂 一种铝母排专用铣床
CN112091298A (zh) * 2020-09-16 2020-12-18 中国航发贵州黎阳航空动力有限公司 直槽加工刀具及加工方法

Also Published As

Publication number Publication date
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