• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for positioning a support tool (1) inside a hollow part of revolution (3), the method comprising at least the following steps: - introduction of the support tool (1) inside the hollow part (3) through an opening defined at one end of said part (3), the inner surface (S) of the part having a first (11) and a second zone the second zone being located between the first zone and the opening, the first zone (11) having an irregular surface state, the introduced support tooling (1) comprising a first part (12) covered with a molding composition in the fluid state (17) bearing on the first zone (11), an impermeable film being present between the molding composition (17) and the first zone (11), the support tooling (1) introduced with in addition to a second centering portion (14) resting on the second zone, hardening of the molding composition (17), the latter taking the form of the surface of the first zone (11) of the hollow part, and - cutting, after hardening of the molding composition, of the second part (14) of the tooling, the piece (3) remaining supported after this cutting by the first part (12) of the support tooling.
    公开号:FR3047916A1
    申请号:FR1651343
    申请日:2016-02-18
    公开日:2017-08-25
    发明作者:Gerard Schon
    申请人:Herakles SA；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION The invention relates to a method of positioning a support tool inside a hollow part of revolution and a method of machining such a hollow part. The machining of the inner surface of a hollow part may firstly include the introduction of a support inside this part. This support bears on a support zone located on the inner surface of this part. The machining of an area of the inner surface distinct from the bearing zone is then performed. When the bearing area has an uneven surface condition, it can be difficult to accurately control the machining performed.
    There is therefore a need to improve the control of the machining performed on the inner surface of hollow parts.
    OBJECT AND SUMMARY OF THE INVENTION For this purpose, the invention proposes, according to a first aspect, a method of positioning a support tool inside a hollow part of revolution, the method comprising at least the following steps : - introduction of the support tooling inside the hollow part through an opening defined at one end of said workpiece, the inner surface of the workpiece having a first and a second area, the second area being located between the first zone and the opening, the first zone having an irregular surface state, the introduced support tool comprising a first portion covered with a molding composition in the fluid state bearing on the first zone, an impermeable film being present between the molding composition and the first zone, the introduced support tooling further having a second centering portion bearing on the second zone, curing of the molding composition, the latter taking the shape of the surface of the first zone of the hollow part, and cutting, after curing of the molding composition, of the second part of the tooling, the piece remaining supported after this cutting by the first part of the support tool.
    The implementation of the molding composition taking the form of the surface of the first zone advantageously makes it possible to improve the support of the part during its machining and thus to improve the quality of the machining performed. In addition, the second part of the tooling ensures the centering of the latter relative to the axis of the hollow part. This second centering portion is "sacrificial" insofar as once the tooling has been introduced centrally relative to the axis of the hollow part, this second part is eliminated in order to allow a machining tool to access the second zone of the internal surface to be machined. The invention advantageously provides a relatively simple method to implement to ensure the achievement of desired dimensional characteristics for the second area after machining even when the bearing area has an irregular surface condition.
    In an exemplary embodiment, the part may be of composite material, for example ceramic matrix composite material.
    In particular, the first zone may have a covering between layers of fibrous reinforcement conferring on it its irregular surface state.
    In an exemplary embodiment, the first and second zones of the part may have a conical shape. Alternatively, the first and second areas of the part may have a cylindrical shape.
    In an exemplary embodiment, the first and second parts of the tool can be separated by a clearance groove in the tool and the cutting of the second part of the tool can be performed at the clearance groove.
    The presence of this clearance groove is advantageous because it avoids any risk of touching the workpiece during the cutting step of the second part of the tooling.
    In an exemplary embodiment, the molding composition in the fluid state may be deposited on the first part of the tool before the introduction of the tool inside the hollow part. Alternatively, the first part of the tooling may be coated by the molding composition during or after the introduction of the tooling into the hollow part.
    The present invention also provides a method of machining a hollow part comprising at least the following steps: positioning of a support tool inside the part by implementing a method as described above, and machining the second area of the inner surface of the hollow part, the part being during machining supported by the first part of the support tool coated by the cured molding composition.
    The part thus machined can constitute at least part of an ejection cone for an aircraft turbojet engine. The workpiece thus machined can then be assembled with another workpiece at the second zone.
    BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will emerge from the following description of particular embodiments of the invention, given by way of non-limiting examples, with reference to the appended drawings, in which: FIG. 1 is a sectional view along the longitudinal axis of the hollow part showing the introduction of the support tool inside said workpiece in accordance with an exemplary method according to the invention, - Figure 2 is a sectional view along the longitudinal axis of the hollow part representing the support tool thus introduced, - Figure 3 shows a detail of Figure 2, - Figure 4 shows the structure of Figures 2 and 3 after hardening of the molding composition and cutting of the second portion of the support tool, - Figure 5 shows the machining of the second area of the inner surface of the hollow part made on the structure of the fig. FIG. 6 shows an aircraft jet engine exhaust cone obtained after machining illustrated in FIG. 5; FIGS. 7 and 8 are sectional views along the longitudinal axis of a FIG. hollow part representing the molding of the shape of the first zone carried out in the context of a variant of the method according to the invention, and - FIGS. 9 and 10 are sectional views along the longitudinal axis of a part hollow representing the molding of the shape of the first zone made in the context of another variant of the method according to the invention.
    Detailed description of embodiments
    FIGS. 1 to 5 show the succession of different steps of the same exemplary method according to the invention.
    FIG. 1 illustrates the introduction of a support tool 1 inside a hollow part 3. The tooling 1 is fixed, before its introduction in the workpiece 3, on a tip 7 / counter-tip 5 system. The tool 1 has as illustrated through openings 8 through which a fastening element 9 is present which ensures the attachment of the tool 1 to the system tip 7 / against-tip 5. The tool can be formed by a high density foam. The high density foam may for example be a LABELTTE 320 foam.
    The hollow part 3 is positioned on a machine tool (not shown), for example on a parallel lathe. The hollow part 3 has an opening 6 at one of its ends through which the tool 1 is intended to be introduced. The hollow part 3 is held at its end opposite the opening 6 by a cimblot 35. The hollow part 3 extends as illustrated along an axis X corresponding here to its longitudinal axis. The hollow part 3 has, in the example illustrated in Figures 1 to 5, a conical shape. However, it is not beyond the scope of the invention when the hollow part has another shape as will be detailed below.
    The hollow part 3 is made of a ceramic matrix composite material and comprises a plurality of draped fibrous reinforcement layers present in a ceramic matrix. The inner surface S of the part 3 has a first 11 and a second 13 zones. The second zone 13 is located between the first zone 11 and the opening 6 (the second zone 13 is located on the side of the opening 6). The second zone 13 is closer to the opening 6 than the first zone 11. The first 11 and second zones 13 have in the example illustrated a frustoconical shape and extend circumferentially around the axis X. The zones overlap between the fibrous reinforcement layers of the part 3 produce local variations in thickness on the surface of the first zone 11 conferring on the latter an irregular surface condition.
    The first zone 11 is, before introduction of the tool 1, coated with an impermeable film 15 to the molding composition that will be used. The impermeable film 15 may be of plastics material. For example, an impervious film sold under the name Wrightlon® 7400 may be used by the company Airtech Europe. The tool 1 is then introduced through the opening 6 along the X axis as shown in Figure 1. The tool 1 has a first portion 12 and a second centering portion 14. The tool 1 has a form of revolution. The tool 1 may as shown to be hollow and define a cavity C (see Figure 3). The first 12 and second 14 parts have, in the illustrated example, a frustoconical shape and extend circumferentially about the X axis when the tool 1 is positioned inside the part 3.
    In the exemplary method according to the invention described with reference to FIGS. 1 to 5, a molding composition in the fluid state 17 is deposited on the first part 12 of the tooling 1 before the introduction of the latter to Inside the hollow part 3. As will be detailed below, however, it is not beyond the scope of the invention when the first part of the tool is coated by the molding composition during or after the introduction of said tooling. inside the hollow room. The molding composition 17 may be a putty or anaerobic foam. The molding composition 17 may, for example, be Valentine putty or Celofer putty or an anaerobic foam marketed under the trade name Nec + Mouss Quick Catch 2C. Tooling 1 is introduced inside the hollow part 3 until its second part 14 comes to rest on the second zone 13 and that the molding composition in the fluid state 17 covering the first part 12 of the tool 1 comes to bear on the first zone 11. The structure obtained after introduction of the tool 1 is illustrated in FIGS. 2 and 3. The molding composition in the fluid state 17 will take the form of the state of surface of the first zone 11. The molding composition 17 in the fluid state abuts the entire circumference of the first zone 11. The presence of the impermeable film 15 between the molding composition 17 and the first zone 11 advantageously allows to avoid that the molding composition 17 comes into contact with the first zone 11 and does not adhere to the latter. The impervious film 15 is in contact with the molding composition in the fluid state 17 and the first zone 11. The second portion 14 of the tool 1 is in turn resting on the second zone 13 which constitutes the zone to be to machine later. The second portion 14 of the tool 1 is in contact with this second zone 13. The first portion 12 of the tool 1 has, as illustrated in Figure 2, a radius r1 less than the radius r2 of the second portion 14 of the 1. Unless otherwise stated, the radius of a portion of the tooling corresponds to the largest outer radius of this portion measured from the axis of the hollow part 3 and perpendicular to this axis X.
    The hardening of the molding composition 17 introduced is then achieved by leaving the molding composition bearing on the first zone 11 as shown in FIGS. 2 and 3 for a sufficient duration. This curing can be carried out because of the polymerization of the molding composition 17. The polymerization of the molding composition 17 can be carried out at room temperature for 30 minutes. The cured molding composition thus obtained illustrated in FIG. 4 takes the form of the surface state of the first zone 11. After this curing, the cured molding composition 19 can be in the solid state.
    The first 12 and second 14 parts of the tool 1 are, in the illustrated example, separated by a clearance groove 21 formed in the tool 1. The clearance groove 21 is present between the first part 12 and the second part 14. The radius Γ3 of the clearance groove 21 is less than or equal to the radius ri of the first portion 12 and less than the radius r2 of the second portion 14.
    In the example illustrated in Figures 2 and 3, the cutting of the second portion 14 of the tool 1 is performed at the clearance groove 21 along the cutting line D shown in Figure 3. For this, a cutting tool (not shown) is introduced into the cavity C defined by the tool 1 of hollow form. The cutting tool may for example be a diamond disc. After cutting, the structure illustrated for example in FIG. 4 is obtained in which the part 3 remains supported by the first part 12 of the support tool 1 coated with the hardened molding composition 19.
    The second zone 13 is then machined by rotating the workpiece 3 about its axis X and bringing into contact, during this rotation, the second zone 13 with a machining tool 25 (see FIG. 5). The second zone 13 is machined over its entire circumference. Part 3 is, during this machining step, supported by the first portion 12 of the support tool 1 covered with the cured molding composition 19. The cured molding composition 19 in the form of the first zone 11 provides support located outside the area to be machined to adapt to the surface defects of the first zone 11. This advantageously makes it possible to avoid the generation of deformations during machining, and thus to obtain a part having the desired dimensional characteristics, and reduce vibration during machining.
    FIG. 6 illustrates the part 27 obtained after machining the second zone 13. The part 27 thus obtained constitutes, in the example illustrated, an ejection cone for an aircraft turbojet engine.
    FIGS. 7 and 8 show an alternative embodiment in which the tool 100 is devoid of molding composition 17 before its introduction into the hollow part 30. In this variant, the first part 120 of the tooling 100 is coated with the molding composition 17 during the introduction of the tooling 100 into the hollow part 30. In addition, in the example of FIGS. 7 to 10, the hollow part 30 is not conical shape but has a cylindrical shape of revolution and the tool 100 is not hollow.
    In the same manner as described above and as illustrated in FIG. 7 in particular, the inner surface S 1 of the hollow part 30 is initially covered with an impermeable film 15 at the level of the first zone 110. The molding composition 17 is then deposited on the first zone 110. The tool 100 is then introduced into the hollow part 30 along the axis Xi of the latter until the first portion 120 of the tool 100 is covered by the molding composition 17. The first portion 120 of the support tool 100 thus introduced is covered by the molding composition 17 in the fluid state which bears on the first zone 110 of the workpiece 30. The tooling 100 introduced also has a second portion 140 bearing on a second zone 130 of the part 30, this second zone 130 constituting the area to be machined later. The first portion 120 of the tooling 100 has a radius less than the radius of the second portion 140 of the tooling 100. The molding composition 17 is then allowed to cure to form a cured composition in the form of the first zone 110 of the piece 30. It is then proceeded to the cutting of the second portion 120 of the tool 100 along the cutting line Di and the machining of the second zone 130 of the piece 30 in a manner similar to that described above. Note that, in the embodiment just described, the tool 100 does not have a clearance groove.
    FIGS. 9 and 10 show another variant of the method according to the invention. In the same manner as described above, the inner surface of the cylindrical hollow part 30 is initially coated with an impermeable film 15 at the level of the first zone 110. The tooling 1000 is then introduced inside the hollow part 30 so as to position the second portion 1400 of said tooling 1000 against a second zone 130 to be machined and to position the first portion 1200 opposite the first zone 110 of the workpiece 30. The tooling 1000 comprises an injection channel 1500 of the molding composition 17. This channel 1500 communicates with the volume V present between the first portion 1200 of the tooling 1000 and the first zone 110 of the workpiece 30. The molding composition in the fluid state 17 is then, as illustrated in FIG. 10, injected through the channel 1500 in order to cover the first portion 1200 of the tooling 1000. The molding composition 17 thus injected abuts on the first zone 110 of the piece 30 in order to take shape in the same way as previously described. The tooling 1000 can advantageously be transparent to the visible radiation. This allows to visualize through the tooling 1000 the molding composition 17 and to control the injection of the latter. The tooling can thus for example be made of poly (methyl methacrylate) (Plexiglas®). Once the molding composition has been injected and cured, a cutout of the second portion 1400 is made along the cutting line Di and the second zone 130 of the workpiece 30 is machined in a manner similar to that described above.
    After machining the second zone, the hollow part can be removed from the machine tool. The hollow part thus machined can then be fixed to another part at the second zone. The fact of precisely controlling the dimensional characteristics of the second machined zone by implementing the method according to the invention advantageously makes it possible to avoid the presence of a game at this second zone during assembly and to improve the quality of the product obtained during this assembly.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Method for positioning a support tool (1; 100; 1000) inside a hollow part of revolution (3; 30), the method comprising at least the following steps: - introduction of the support tooling (1; 100; 1000) inside the hollow piece (3; 30) through an opening (6) defined at one end of said piece (3; 30), the inner surface (S Si) of the part having a first (11; 110) and a second (13; 130) zones, the second zone being located between the first zone and the opening, the first zone (11; surface, the support tooling (1; 100; 1000) introduced comprising a first portion (12; 120; 1200) covered with a molding composition in the fluid state (17) bearing on the first zone (11); 110), an impervious film (15) being present between the molding composition (17) and the first region (11; 110), the supporting tool (1; 100; 1000). introduced further having a second centering portion (14; 140; 1400) pressing against the second zone (13; 130), - hardening of the molding composition (17), the latter taking the form of the surface of the first zone (11; 110) of the hollow part, and - cutting, after curing the molding composition, the second portion (14; 140; 1400) of the tooling, the workpiece (3; 30) remaining supported after this cutting by the first portion (12; 120; 1200) of tooling support.
    [2" id="c-fr-0002]
    2. Method according to claim 1, the piece (3; 30) being made of composite material.
    [3" id="c-fr-0003]
    3. Method according to claim 2, the piece (3; 30) being made of ceramic matrix composite material.
    [4" id="c-fr-0004]
    4. Method according to any one of claims 2 and 3, the first zone (11; 110) having a covering between fibrous reinforcement layers conferring on it its irregular surface state.
    [5" id="c-fr-0005]
    5. Method according to any one of claims 1 to 4, the first (11) and second (13) zones of the part (3) having a conical shape.
    [6" id="c-fr-0006]
    6. Method according to any one of claims 1 to 5, the first (12) and second (14) parts of the tool (1) being separated by a clearance groove (21) formed in the tooling and cutting the second portion (14) of the tooling being performed at the clearance groove (21).
    [7" id="c-fr-0007]
    7. Method according to any one of claims 1 to 6, the molding composition (17) in the fluid state being deposited on the first portion (12) of the tool (1) before the introduction of the tooling (1) inside the hollow part (3).
    [8" id="c-fr-0008]
    The method according to any one of claims 1 to 6, the first portion (120; 1200) of the tooling (100; 1000) being coated by the molding composition (17) during or after the introduction of the tooling (100; 1000) inside the hollow part (30).
    [9" id="c-fr-0009]
    9. A method of machining a hollow part (3; 30) comprising at least the following steps: - positioning of a support tool (1; 100; 1000) inside the part (3; 30) by implementing a method according to any one of claims 1 to 8, and - machining the second area (13; 130) of the inner surface of the hollow part, the part (3; 30) being during the machining supported by the first portion (12; 120; 1200) of the support tool coated with the cured molding composition (19).
    [10" id="c-fr-0010]
    10. The method of claim 9, the part (27) thus machined constituting at least part of an ejection cone for an aircraft turbojet engine.
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    同族专利:
    公开号 | 公开日
    FR3047916B1|2018-05-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5138918A|1990-05-31|1992-08-18|Xerox Corporation|Method and apparatus for securing drum blanks on isostatic mandrel|
    JPH06155117A|1992-11-11|1994-06-03|Okuma Mach Works Ltd|Machining method for low stiffness work|
    US20060156785A1|2005-01-19|2006-07-20|Mankame Nilesh D|Reconfigurable fixture device and methods of use|CN110682120A|2019-10-21|2020-01-14|山西平阳重工机械有限责任公司|Positioning and supporting device for machining thin-wall shell parts|
    CN111993172A|2020-08-29|2020-11-27|中国航发南方工业有限公司|Thin-wall blind hole shaft machining method|
    CN112008603A|2020-08-29|2020-12-01|中国航发南方工业有限公司|Blind hole slender shaft inner supporting device|
    CN110682120B|2019-10-21|2022-03-15|山西平阳重工机械有限责任公司|Positioning and supporting device for machining thin-wall shell parts|
    CN109926851B|2019-04-18|2020-11-20|山西平阳重工机械有限责任公司|Clamping tool and machining method for thin-wall cylindrical part with bell mouth|
    法律状态:
    2017-02-10| PLFP| Fee payment|Year of fee payment: 2 |
    2017-08-25| PLSC| Publication of the preliminary search report|Effective date: 20170825 |
    2018-01-23| PLFP| Fee payment|Year of fee payment: 3 |
    2020-01-22| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-15| CD| Change of name or company name|Owner name: SAFRAN CERAMICS, FR Effective date: 20200409 |
    2021-01-20| PLFP| Fee payment|Year of fee payment: 6 |
    2022-01-19| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1651343|2016-02-18|
    FR1651343A|FR3047916B1|2016-02-18|2016-02-18|METHOD FOR POSITIONING A SUPPORT TOOLING INSIDE A REVOLUTION HOLLOW PIECE|FR1651343A| FR3047916B1|2016-02-18|2016-02-18|METHOD FOR POSITIONING A SUPPORT TOOLING INSIDE A REVOLUTION HOLLOW PIECE|
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