EP1525949B1 - Automatisiertes Polierverfahren von mechanischen Werkstücken aus Titan oder Titanlegierungen - Google Patents

Automatisiertes Polierverfahren von mechanischen Werkstücken aus Titan oder Titanlegierungen Download PDF

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Publication number
EP1525949B1
EP1525949B1 EP04300676A EP04300676A EP1525949B1 EP 1525949 B1 EP1525949 B1 EP 1525949B1 EP 04300676 A EP04300676 A EP 04300676A EP 04300676 A EP04300676 A EP 04300676A EP 1525949 B1 EP1525949 B1 EP 1525949B1
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EP
European Patent Office
Prior art keywords
polishing
allowance
wheel
titanium
removal
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.)
Expired - Lifetime
Application number
EP04300676A
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English (en)
French (fr)
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EP1525949A1 (de
Inventor
Bertrand Bouillot
Alain Keller
Daniel Langeard
Alain Martinez
Giao-Minh Nguyen
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.)
Safran Aircraft Engines SAS
Original Assignee
SNECMA SAS
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Filing date
Publication date
Application filed by SNECMA SAS filed Critical SNECMA SAS
Publication of EP1525949A1 publication Critical patent/EP1525949A1/de
Application granted granted Critical
Publication of EP1525949B1 publication Critical patent/EP1525949B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/16—Machines or devices using grinding or polishing belts; Accessories therefor for grinding other surfaces of particular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials

Definitions

  • the present invention relates to the field of polishing mechanical parts made of titanium or titanium alloy. It relates in particular to turbomachine blades and in particular to large blades such as fan blades in a turbojet and aims in particular a method of manufacturing such blades implementing said polishing.
  • the blades are conventionally used for polishing abrasive strips of silicon carbide.
  • the strip is mounted on a wheel driven in rotation tangentially to the surface of the part.
  • the displacement of the wheel relative to the surface of the part is controlled by a program according to the desired geometry. Parameters such as the speed of travel of the web on the surface, the speed of movement of the wheel relative to the workpiece and the pressure exerted on the surface are determined so as to remove the required thickness of material and ensure certain surface condition.
  • a description of an abrasive belt polishing machine is described in US Patent 5,193,314 .
  • Abrasive belt polishing is used in particular in the context of a method of geometrically aligning semi-finished blades resulting from forging, for example.
  • a specific material thickness is removed by polishing.
  • the conventional abrasive material removes an insufficient amount of material by passing the wheel with the band, which requires additional operations of material removal and thickness control.
  • a geometrically conforming method of a semi-finished forged blade includes chemical machining prior to polishing. After having polished the part a first time with a determined grain, one must proceed to a chemical machining and manual retouching on electric straight grinders or with reels or other portable machine.
  • the present invention aims to overcome the disadvantages encountered with the abrasive belts of the prior art.
  • the method of automated polishing of semi-finished titanium or titanium alloy mechanical parts by means of a machine with an abrasive belt mounted on a tangential contact wheel driven in rotation with a speed and applied with a determined pressure, the wheel moving relative to the surface of the workpiece with a determined speed, is characterized in that the abrasive belt consists of super-abrasive grains industrial diamond or cubic boron nitride for polishing in appearance final and removal of an excess thickness of between 0.01 mm and 0.2 mm, preferably 0.1 mm.
  • the abrasive layer of the tape is more accurate.
  • the super abrasive grains are supported by a layer of nickel which is itself integral with a polyester base.
  • the nickel layer absorbs heat and avoids work hardening.
  • the amounts of material are removed with a very low thickness dispersion.
  • This low dispersion has a significant advantage in the of the geometric alignment of the blades from semi-finished parts with determined thickness.
  • the removal of material is carried out with a deviation from the setpoint sufficiently low so that one remains within the shape tolerance band of the blade. This avoids the need for manual adjustments by grinding.
  • the extra thickness is between 1/10 mm and 8/10 mm, preferably between 2/10 and 4/10 mm for a first-aspect polishing.
  • the contact wheel is grooved with grooves arranged obliquely with respect to the axis of rotation of the wheel.
  • the angle is in particular 25 to 35 °.
  • the contact surface of the wheel with the abrasive belt has a hardness of 70 Shore.
  • the machine has five or six axes of freedom.
  • An exemplary embodiment 1 is represented on the figure 1 .
  • This is for example a commercially available machine provided by the company Metabo.
  • a table 10 with two jaws 11 and 13 between which the elongate piece such as a compressor blade is kept horizontal.
  • the entire part with its support can move in this direction X or turn on itself about this axis in the direction U by means of suitable electric motors Mx and Mu.
  • a head 100 is mounted on a vertical tower 20 and can move along its axis Z.
  • the head 100 can also move in rotation W about this axis Z.
  • Suitable motor means Mz and Mw are provided for driving the head in both directions.
  • the head 100 can move horizontally in the direction Y perpendicular to the direction X and rotate in the direction V around this axis.
  • Motor means My and Mv provide these movements.
  • the head 100 supports a movable contact wheel 110 about an axis which is fixed relative to itself.
  • a motor mounted on the head 100 drives the wheel 110 through an abrasive belt which is mounted at the periphery of the wheel.
  • All the motor means is connected to a control box which comprises a control unit with programming means and memories incorporating in particular the geometrical data of the piece to be polished.
  • the strip is applied locally tangentially to its surface by exerting a determined pressure and it is set in motion. She turns with the wheel around her axis.
  • the desired removal value and surface condition depend both on the grain of the web but also on the machine parameters applied and the characteristics of the contact wheel.
  • a wheel of a given width, 25 mm with a determined outer diameter, 120 mm is used.
  • the wheel has on the surface grooves inclined at 30 °, of width 3 mm and 17 mm apart from each other.
  • the material at the periphery of the wheel is a rubber of determined hardness, for example 70 shore.
  • Such a machine is used in the context of operations of geometric compliance and polishing finishing of a semi-finished part.
  • the semi-finished part from the forging station has a shape and dimensional characteristics close to the finished part. However its odds are not final yet due to a specific allowance. In the framework of precision forging, this extra thickness is set from 2/10 to 4/10 mm. The purpose of the automated polishing operation is to remove this extra thickness.
  • the next stage of preparation consists of a chemical machining.
  • the titanium alloys are chemically dissolved in a bath composed of nitric acid, hydrofluoric acid and other agents such as wetting agents or water.
  • the immersion time in the bath determines the amount of material removed.
  • the advantage of chemical machining is to remove a uniform material thickness, regardless of its shape.
  • the two operations are repeated until a determined excess thickness is obtained by the polishing operation.
  • the polishing operation by passage of the workpiece in a machine comprising an abrasive belt is in itself known. We proceed to a polishing said first appearance.
  • the dispersion in amount of material removed is important.
  • This control is followed by a step of manual adjustment on a drum; this is a delicate operation and can only be performed by qualified personnel.
  • these manual operations are the possible cause of occupational diseases such as MSDs (musculoskeletal disorders).
  • Finishing is polished with a finer grain.
  • the removal is, for example, 0.1 mm +/- 0.05 mm.
  • a final validation of the geometry with manual retouching is possibly necessary.
  • a strip is used with super-abrasive grains such as industrial diamond grains or cubic boron nitride.
  • the support 210 is a synthetic material based for example on polyester.
  • the support 210 are hung grains 220 of nickel.
  • the latter themselves serve as support for super-abrasive particles such as industrial diamond or cubic boron nitride. Deposition is performed electrochemically which ensures the formation of a homogeneous abrasive layer.
  • Such abrasive belts are commercially available and supplied for example by the companies 3M, Saint Gobain Abrasives or KGS
  • Such a band allows a removal of material with a low dispersion thickness.
  • the part having the desired dimensions is obtained directly by polishing by means of such strips.
  • the so-called first aspect, the other term finishing. Remains remarkably within the tolerance of form imposed by the specifications.
  • Polishing in the final appearance by means of a 220 grit diamond band removes a quantity of material of 0.1 mm +/- 0.01 mm and provides a surface state of 0.8 ⁇ m.
  • the final validation operation which consists of a dimensional and appearance check can be performed without using the drum or the portable polishing machine.
  • the first aspect of polishing is carried out on a thickening defined so as to allow a material removal between 0.1 mm and 0.8 mm, preferably between 0.2 mm and 0.4 mm and more particularly, as reported previously, 0.3 mm +/- 0; 05 mm.
  • Finishing polishing by means of the diamond band with a fine grain is carried out so as to ensure a material removal between 0.01 and 0.2 mm +/- 0.01 mm and preferably 0.1 mm +/- 0.01 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (6)

  1. Automatisiertes Polierverfahren zum Polieren halbfertiger mechanischer Werkstücke aus Titan oder Titanlegierung mittels einer Maschine mit einem Schleifband, das auf einem Rad mit tangentialem Kontakt sitzt, welches mit einer bestimmten Geschwindigkeit in Drehbewegung angetrieben wird und mit einem bestimmten Druck angedrückt wird, wobei das Rad zur Oberfläche des Werkstücks mit einer bestimmten Geschwindigkeit verschoben wird,
    dadurch gekennzeichnet,
    dass das Schleifband mit Superschleifkörnern aus Industriediamant oder aus kubischem Bornitrid für ein Endpolieren und zum Abheben einer Überdicke von 0,01 mm bis 0.2 mm, vorzugsweise von 0,1 mm gebildet ist.
  2. Verfahren nach dem vorherigen Anspruch zum Polieren von Turbomaschinenschaufeln, die eine bestimmte Überdicke aufweisen, wobei die Maschinenparameter in den folgenden Intervallen festgesetzt sind:
    - Andruckkraft des Rades auf der Oberfläche des Werkstücks : 137N bis 196N.
    - Laufgeschwindigkeit des Schleifbandes : 4,6 m/s bis 18,6 m/s.
    - Vorschubbereich des Rades relativ zu dem Werkstück : 3,4 m/min bis 6,7 m/min.
  3. Verfahren nach dem vorherigen Anspruch, bei dem die Überdicke für ein erstes Polieren zwischen 1/10 mm und 8/10 mm beträgt, vorzugsweise zwischen 0,2 mm und 0.4 mm.
  4. Verfahren nach einem der vorherigen Ansprüche, bei dem das Kontaktrad gerillt ist.
  5. Verfahren zur Herstellung von Turbotriebwerksschaufeln aus Titan oder Titanlegierung, das die Fertigung einer halbfertigen Schaufel mit einer Überdicke und die Beseitigung dieser Überdicke beinhaltet, und das mindestens einen Verfahrensschritt des Endpolierens nach Anspruch 1 umfasst, wobei die Überdicke vor Beseitigung dergestalt bestimmt ist, dass während eines ersten Poliervorgangs das Materialabheben von 0,2 mm bis 0,4 mm und insbesondere von 0,3 mm +/- 0,05 mm ermöglicht ist.
  6. Verfahren nach dem vorherigen Anspruch, bei dem die Beseitigung dieser Überdicke durch ein erstes Polieren mittels eines Diamantbandes oder Bandes mit kubischem Bornitrid durchgeführt wird.
EP04300676A 2003-10-14 2004-10-12 Automatisiertes Polierverfahren von mechanischen Werkstücken aus Titan oder Titanlegierungen Expired - Lifetime EP1525949B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0312005A FR2860743B1 (fr) 2003-10-14 2003-10-14 Procede de polissage automatise de pieces mecaniques en titane ou alliage de titane
FR0312005 2003-10-14

Publications (2)

Publication Number Publication Date
EP1525949A1 EP1525949A1 (de) 2005-04-27
EP1525949B1 true EP1525949B1 (de) 2008-03-05

Family

ID=34355469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04300676A Expired - Lifetime EP1525949B1 (de) 2003-10-14 2004-10-12 Automatisiertes Polierverfahren von mechanischen Werkstücken aus Titan oder Titanlegierungen

Country Status (7)

Country Link
US (1) US7029367B2 (de)
EP (1) EP1525949B1 (de)
JP (1) JP2005118989A (de)
CA (1) CA2481887C (de)
DE (1) DE602004012208T2 (de)
FR (1) FR2860743B1 (de)
RU (1) RU2368486C2 (de)

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CN100467218C (zh) * 2007-09-30 2009-03-11 东北大学 一种砂带曲面磨床
FR2947197B1 (fr) * 2009-06-26 2011-07-15 Snecma Procede de fabrication d'une piece forgee avec polissage adaptatif
US8567059B2 (en) * 2009-07-10 2013-10-29 Pratt & Whitney Canada Corp. Process for forming a firtree slot in a disc of a rotor of a gas turbine engine
CN101664897B (zh) * 2009-09-11 2011-06-22 重庆三磨海达磨床有限公司 螺旋桨叶片砂带磨床
DE102010047510A1 (de) * 2010-10-05 2012-04-05 Sepotec Maschinenbau Gmbh Bandschleifmaschine zum Maßschleifen von Freiformflächen
FR2979267B1 (fr) * 2011-08-26 2014-04-18 Snecma Procede de fabrication d'une piece par forgeage
US9067294B2 (en) 2011-11-30 2015-06-30 United Technologies Corporation Coating removal apparatus
CN102806510A (zh) * 2012-08-14 2012-12-05 西北工业大学 航空发动机钛合金叶片数控抛光工艺方法
CN103358209B (zh) * 2013-07-19 2015-09-30 无锡鹰贝精密轴承有限公司 高效圆弧面超精加工超精机
CN103612185B (zh) * 2013-12-16 2016-08-17 电子科技大学 七轴联动数控砂带磨抛机床
CN103612186B (zh) * 2013-12-17 2016-01-06 重庆大学 一种用于复杂曲面的砂带研磨装置
CN105312983B (zh) * 2014-12-05 2018-07-27 电子科技大学 整体螺旋桨智能磨削加工系统
CN104942684B (zh) * 2015-06-19 2017-04-12 全友家私有限公司 一种高质量弧形板磨砂机
CN104942683B (zh) * 2015-07-07 2017-03-22 重庆大学 叶片双头砂带磨削中心
CN105127864A (zh) * 2015-09-24 2015-12-09 广东博天科技股份有限公司 一种智能磨削机
CN105945691B (zh) * 2016-06-29 2017-11-07 重庆大学 面向型面精度一致性的砂带磨削装置
CN107511745A (zh) * 2017-09-30 2017-12-26 四川大学 一种叶片加工多机器人智能协同作业设备
RU2674358C1 (ru) * 2018-02-06 2018-12-07 Федеральное государственное бюджетное учреждение науки Институт машиноведения им. А.А. Благонравова Российской академии наук (ИМАШ РАН) Способ финишной обработки заготовки лопатки газотурбинного двигателя и устройство для его осуществления
CN108972354B (zh) * 2018-08-21 2020-02-14 中国航发航空科技股份有限公司 一种叶片喷丸表面数控磨削光整加工方法
CN110052652B (zh) * 2019-04-11 2020-05-05 西安航天精密机电研究所 一种人机隔离自动化拆盖铣削整形加工系统及方法
CN110103116B (zh) * 2019-05-23 2020-10-02 华中科技大学 一种自适应姿态的主被动柔顺磨抛装置及磨抛机器人
CN111376147A (zh) * 2020-04-22 2020-07-07 合肥锦鑫隆机械制造有限公司 一种机械加工用异形零件打磨装置
CN112428104B (zh) * 2020-11-05 2024-11-12 江苏匠准数控机床有限公司 一种叶片磨抛光检测一体机
CN113182993B (zh) * 2021-05-18 2021-12-10 温州市聚盛丰达轻工设备有限公司 一种五金索具加工用打磨机床
CN114789392B (zh) * 2022-05-05 2024-06-11 中国航发航空科技股份有限公司 一种航空发动机叶片阻尼台的抛光轮及抛光方法
CN116475894B (zh) * 2023-02-03 2026-01-16 中复连众(连云港)风电叶片有限公司 打磨设备

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Also Published As

Publication number Publication date
EP1525949A1 (de) 2005-04-27
US20050136799A1 (en) 2005-06-23
RU2004129719A (ru) 2006-03-20
FR2860743B1 (fr) 2006-01-13
DE602004012208D1 (de) 2008-04-17
FR2860743A1 (fr) 2005-04-15
CA2481887C (fr) 2012-08-14
RU2368486C2 (ru) 2009-09-27
CA2481887A1 (fr) 2005-04-14
DE602004012208T2 (de) 2009-02-26
US7029367B2 (en) 2006-04-18
JP2005118989A (ja) 2005-05-12

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