EP0712689A2 - Procédé et dispositif de rodage d'une surface conique d'une pièce métallique - Google Patents

Procédé et dispositif de rodage d'une surface conique d'une pièce métallique Download PDF

Info

Publication number
EP0712689A2
EP0712689A2 EP95402475A EP95402475A EP0712689A2 EP 0712689 A2 EP0712689 A2 EP 0712689A2 EP 95402475 A EP95402475 A EP 95402475A EP 95402475 A EP95402475 A EP 95402475A EP 0712689 A2 EP0712689 A2 EP 0712689A2
Authority
EP
European Patent Office
Prior art keywords
conical surface
support
abrasive stone
stone
lapping
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Withdrawn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
EP95402475A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0712689A3 (enrdf_load_stackoverflow
Inventor
Daniel Meyer
Louis Laroche
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.)
Areva NP SAS
Original Assignee
Framatome SA
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 Framatome SA filed Critical Framatome SA
Publication of EP0712689A2 publication Critical patent/EP0712689A2/fr
Publication of EP0712689A3 publication Critical patent/EP0712689A3/xx
Withdrawn legal-status Critical Current

Links

Images

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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
    • 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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • B24B33/025—Internal surface of conical shape
    • 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
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/11—Lapping tools
    • B24B37/20—Lapping pads for working plane surfaces
    • B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials

Definitions

  • the invention relates to a method and a device for lapping a conical inner surface of a metal part.
  • the invention applies to a method and to a device for lapping an interior surface of conical shape of an end portion of an adapter for crossing the cover of the vessel of a nuclear reactor with pressurized water.
  • Pressurized water nuclear reactors comprise a tank of generally cylindrical shape, the upper end of which is closed in leaktight manner, during operation of the reactor, by a cover of substantially hemispherical shape.
  • the cover of the tank is crossed by openings in each of which is fixed a tubular adapter, in a direction parallel to the axis of the tank.
  • the adapters for crossing the cover of the tank allow the passage inside the tank, in an axial direction, of extenders at the end of which are fixed the clusters for adjusting the reactivity of the core or columns of thermocouples.
  • a thermal jacket is fixed, in a coaxial arrangement relative to the cylindrical interior surface of the adapter and with a small diametral play.
  • the extenders of the control rods move inside the thermal jackets which define the axis of movement of the extension rod and the control rod.
  • the interior bore for passage of the adapter is machined, so to produce an internal surface of conical shape.
  • the adapters are welded to the inner surface of the tank cover, so that they undergo heating when they are mounted on the tank cover, which induces deformation which can generate residual stresses.
  • the bushing adapters for the tank cover of pressurized water nuclear reactors which are made of nickel alloy have residual tensile stresses on their internal surface, after drilling, machining and mounting on the cover.
  • the tendency for stress corrosion cracking of adapters can be greatly reduced or eliminated by carrying out certain treatments on the interior surface of the adapters and in particular mechanical surface treatments producing compression stresses in the internal surface layer of the wall of the adapters. .
  • lapping treatments were carried out on the interior surface of the adapters, that is to say treatments by bringing into rubbing contact with an abrasive stone from the surface of the adapters.
  • the object of the invention is to propose a method for lapping an interior surface of a conical shape of a metal part, by bringing into friction contact of the surface of the part with a surface of an abrasive stone, in which puts the part in rotation around the axis of the conical surface and the abrasive stone is moved in an alternative translational movement, in a direction inclined relative to the axis of the conical surface, by an angle substantially equal to half angle at the top of the conical surface, this process making it possible to very precisely adjust the running-in parameters to obtain a roughness and a well-determined state of stress of the internal surface of the metal part.
  • the abrasive stone is moved in a direction perpendicular to the axis of the conical surface, so as to adjust the advance and the pressing pressure of the abrasive stone on the inner surface of the metal part.
  • Figure 1 is a sectional view through an axial plane of the end portion having a conical inner surface of an adapter for crossing the vessel of a nuclear reactor.
  • Figure 2 is an axial sectional view of the adapter shown in Figure 1 in which a lapping operation is carried out by a method according to the invention.
  • FIG. 2A is a partial sectional view along AA of FIG. 2.
  • Figure 3 is an enlarged view of part of Figure 2 showing a detail of the lapping tool used for the implementation of the method according to the invention.
  • Figure 4 is a top view in section of the tool used for the implementation of the lapping process according to the invention.
  • FIG. 5 is a view in elevation and in partial section of the means of axial translation of the abrasive stone of the tool shown in FIG. 4.
  • the illustrated end of the adapter 1 is its lower end located under the cover of the tank, in which the wall 2 of the generally tubular adapter is machined to present a conical interior surface 3 having the same axis as the part cylindrical top of the adapter.
  • the conical surface 3 which has a small opening angle, of the order of 20 °, opens at the bottom of the adapter below the cover of the tank. After machining this frustoconical part in turn, a lapping of the gross machining surface is carried out by the method of the invention using a device 5 presented as a whole in FIG. 4 and comprising an abrasive stone 9 carried by a support tool 7, as shown in more detail in Figure 2.
  • the tool support 7 carrying the abrasive stone 9 can be moved parallel to an inclined direction relative to the axis 4 of the bore of the adapter, in one direction and in the other, as represented by the double arrow 8.
  • the abrasive stone 9 of the lapping device is an abrasive stone having the shape of an elongated bar which is carried by a stone support 6, so as to be placed in a direction substantially parallel to the tool support 7 of elongate shape and movable in translation in one direction and in the other in the directions given by the double arrow 8.
  • the adapter 1 is rotated about its axis 4, as shown diagrammatically by the curved arrow 10.
  • the abrasive stone 9 is fixed inside a hollow support 6 which is mounted, as shown in FIGS. 2 and 3, flexibly on the tool support 7, by means of axes 11 and 11 '.
  • Each of the axes 11 and 11 ′ is integral with the stone support 6 of the abrasive stone 9 and arranged in a direction perpendicular to the longitudinal direction of the stone support 6 and of the abrasive stone 9 in the form of a bar.
  • Each of the axes 11 and 11 ′ has a threaded end part such as the end part 11a shown in FIG. 3.
  • the axes 11 and 11 ′ are engaged with a certain radial clearance through openings such as 13 passing through the tool support 7 of the lapping machine; the threaded parts of the axes 11 and 11 ′ such as the part 11a shown in FIG. 3 protrude relative to the surface of the tool support 7, opposite the stone support 6 of the abrasive stone 9.
  • Nuts such as 12 screwed onto the threaded parts such as 11a of the axes 11 and 11 ' make it possible to ensure the connection between the tool support 7 and the support 6 of the lapping stone, by means of washers 12' interposed between each of the nuts such as 12 and the support 7 and helical springs 14 and 14 'each interposed between the tool support 7 and the support 6 of the stone to be lapped.
  • the abrasive stone 6 is mounted on the tool support 7, with a certain latitude of movement in a direction perpendicular to the longitudinal direction of the tool support 7.
  • the springs 14 and 14 ′ interposed between the tool support 7 of the tool and the stone support 6 provide a floating mounting of the lapping stone 9 in a direction perpendicular to the longitudinal axis of the tool support 7.
  • the tool support 7 and the lapping stone 9 are arranged, during lapping, in a direction inclined relative to the axis 4 of the conical surface of the adapter 1, at an angle substantially equal to the half-angle at the top of the conical surface 3.
  • the abrasive stone 9 has a lapping surface substantially parallel to the conical interior surface 3 of the adapter 1.
  • the lapping stone 9 has an active external surface of substantially cylindrical and convex shape which is directed so as to be substantially parallel to the internal surface 3 of the adapter.
  • the tool support 7 can be moved in one direction and in the other, in a direction perpendicular to its longitudinal direction, as represented by the double arrow 15 in fig 2.
  • This direction of translation of the tool support 7 which corresponds to a direction of advance of the abrasive stone 9 performing the lapping is perpendicular to a generator of the inner surface 3 of conical shape in which the lapping is carried out at a given instant.
  • the tool support 7 on which the abrasive stone 9 is mounted with a certain latitude of movement in a direction perpendicular to the longitudinal axis of the tool support 7 is integral with a support intermediate 16 itself mounted on a displacement block 17 movable on rails of a machining support 19.
  • the body 18a of the jack 18 is integral with the displacement block 17 movable on the machining support 19.
  • the rod 18b of the jack 18 secured to a piston 18c is fixed, at its end, to the fixed support 19, by means of a fixing lug such as 20.
  • the displacement block 17 integral with the cylinder body 18a can be moved in one direction and in the other by feeding the cylinder at the level a supply orifice 21 or 21 'located on one side or the other of the piston 18c.
  • the machining support 19, the displacement block 17 and the intermediate support 16 carrying the tool support 7 can be moved, as shown in FIG. 4, in one direction and in the other parallel to the axis 4 of the adapter 1, as shown by arrow 22, and perpendicular to this axis 4, as shown by the double arrow 23, by mounting the machining support 19 on a lathe bench 24 whose position can be adjusted in the direction of axis 4 and which comprises a crank 25 for movement in the direction of the double arrow 23.
  • the running-in device shown in FIG. 4 further comprises an end-of-travel stop assembly 26 comprising two end-of-travel contactors 26a and 26b which come into contact with a stop 27 of the intermediate support 16 at the end of movement of the support intermediate 16, of the tool support 7 and of the abrasive stone 9, in one direction and in the other, in the direction of the double arrow 8.
  • the limit switches allow the supply of the actuator to be successively controlled by orifice 21 and through orifice 21 '.
  • oil is continuously sent to the running-in surface, collected and then filtered, so as to be recycled in the running-in installation.
  • the running-in device therefore includes an oil distribution, recovery and filtration circuit which ensures continuous circulation and recycling of the oil used.
  • the running-in operation is carried out in two phases, a first phase being a roughing phase of the interior surface of the adapter and a second phase being a finishing phase.
  • the roughing phase is carried out using an abrasive stone having a grain of 150.
  • the finishing phase is carried out using an abrasive stone having a grain of 400.
  • an internal surface 3 of the adapter in its conical part, having a low roughness and residual compressive stresses favorable to the resistance of the internal surface of the adapter to stress corrosion.
  • Comparative stress and roughness measurements were carried out on the conical inner surface 3 of the adapter and on a cylindrical part of the inner surface of the adapter, after a running-in operation.
  • the lapping method according to the invention makes it possible to obtain an identical roughness and stress state on the conical part and on the cylindrical part of the interior surface of the adapter.
  • Lapping made it possible to create a layer on the conical inner surface 3 of the adapter, in which the stresses are compression stresses, over a thickness of approximately 100 ⁇ m. Lapping also produces a work hardening of a layer of the conical wall of the adapter with a thickness of the order of 20 ⁇ m.
  • the pressure of the lapping stone on the interior surface of the adapter is increased by displacement towards the interior surface of the adapter of the tool holder 7 on which the lapping stone 9 is mounted with a certain latitude of displacement. and returned towards the surface of the adapter by the springs 14 and 14 '.
  • the running-in operation is checked using a conical gauge, the measurement of which penetration into the conical part of the adapter bore.
  • the roughness measurements are carried out with a roughness meter, the average roughness target being 0.25 Ra in micrometers.
  • the method and the device according to the invention therefore make it possible to carry out a lapping operation of a conical interior surface of a part under conditions entirely comparable to lapping of a cylindrical interior surface.
  • the lapping operation of the frustoconical end part of the adapter makes it possible to form compression stresses on the inner surface of the adapter in its end part and therefore to limit the susceptibility to corrosion under stress of this part of the adapter.
  • the method and the device according to the invention can enable the lapping of any conical surface of a metal part.
  • the method according to the invention could be adapted to the running-in of a conical outer surface of a metal part.
  • the invention is not limited to the method and the device which have been described above.
  • the device used for setting work of the method according to the invention must allow a displacement in alternative translation of the abrasive stone to be lapped in a direction inclined at a certain angle relative to the axis of the conical surface around which the metal part is rotated.
  • the invention applies not only to the lapping of the interior surface of the adapters but also to the lapping of any conical, interior or exterior surface of a metal part of tubular shape or of a different shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP95402475A 1994-11-18 1995-11-06 Procédé et dispositif de rodage d'une surface conique d'une pièce métallique Withdrawn EP0712689A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413857 1994-11-18
FR9413857A FR2727046A1 (fr) 1994-11-18 1994-11-18 Procede et dispositif de rodage d'une surface conique d'une piece metallique

Publications (2)

Publication Number Publication Date
EP0712689A2 true EP0712689A2 (fr) 1996-05-22
EP0712689A3 EP0712689A3 (enrdf_load_stackoverflow) 1996-06-05

Family

ID=9468950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402475A Withdrawn EP0712689A2 (fr) 1994-11-18 1995-11-06 Procédé et dispositif de rodage d'une surface conique d'une pièce métallique

Country Status (4)

Country Link
EP (1) EP0712689A2 (enrdf_load_stackoverflow)
KR (1) KR960017054A (enrdf_load_stackoverflow)
CN (1) CN1131600A (enrdf_load_stackoverflow)
FR (1) FR2727046A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699656A (zh) * 2012-06-15 2012-10-03 青岛元通机械有限公司 圆锥面活络模具加工方法及活络模具
CN104511798A (zh) * 2014-12-11 2015-04-15 贵州红林机械有限公司 一种高精度铜转子柱塞孔的珩磨加工方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101157191B (zh) * 2007-09-18 2012-04-04 重庆川仪自动化股份有限公司 蓝宝石喷嘴内锥面的加工方法
CN101700645B (zh) * 2009-10-19 2011-07-27 北京中冶设备研究设计总院有限公司 一种水平式电镀槽导电辊在线珩磨方法
CN105479322B (zh) * 2015-11-18 2017-11-24 中船黄埔文冲船舶有限公司 一种圆锥孔自动研磨装置
CN108145538B (zh) * 2017-11-29 2020-10-16 辽宁科技大学 用于波纹筒筛孔毛刺去除的工艺
CN108188660A (zh) * 2017-12-22 2018-06-22 哈尔滨汽轮机厂有限责任公司 一种高效加工细长杆小锥孔的方法
CN108705402A (zh) * 2018-07-18 2018-10-26 重庆炅达贸易有限公司 汽车配件加工设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244806A (en) 1936-03-11 1941-06-10 Heald Machine Co Honing apparatus
US2276611A (en) 1939-05-05 1942-03-17 Micromatic Hone Corp Honing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1586238A (en) * 1924-03-19 1926-05-25 Pratt & Whitney Co Method and device for lapping gauges
DE69206676T2 (de) * 1991-05-10 1996-05-02 Hughes Aircraft Co Vorrichtung zum Fertigbearbeiten einer Konusähnlichen Oberfläche

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244806A (en) 1936-03-11 1941-06-10 Heald Machine Co Honing apparatus
US2276611A (en) 1939-05-05 1942-03-17 Micromatic Hone Corp Honing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699656A (zh) * 2012-06-15 2012-10-03 青岛元通机械有限公司 圆锥面活络模具加工方法及活络模具
CN104511798A (zh) * 2014-12-11 2015-04-15 贵州红林机械有限公司 一种高精度铜转子柱塞孔的珩磨加工方法

Also Published As

Publication number Publication date
FR2727046B1 (enrdf_load_stackoverflow) 1997-02-07
KR960017054A (ko) 1996-06-17
FR2727046A1 (fr) 1996-05-24
CN1131600A (zh) 1996-09-25
EP0712689A3 (enrdf_load_stackoverflow) 1996-06-05

Similar Documents

Publication Publication Date Title
EP2178672B1 (fr) Dispositif de martelage pour realiser le martelage des soudures a l'interieur de conduites sous marines en acier, procede de realisation de conduites sous marines en acier utilisant un tel dispositif
EP0600768B1 (fr) Procédé et dispositif de réparation d'une zone défectueuse de la paroi d'une pièce métallique et en particulier d'une pièce tubulaire
EP0712689A2 (fr) Procédé et dispositif de rodage d'une surface conique d'une pièce métallique
FR2591919A1 (fr) Machine-outil pour laminer par refoulement des pieces cylindriques creuses
FR2637831A1 (fr) Machine et outil pour le traitement de pieces a usiner par pierrage
CA2063693A1 (fr) Pistolet de decoupage de tole
EP0598634B1 (fr) Procédé et dispositif de réparation de la surface intérieure d'un adapteur traversant le couvercle de la cuve d'un réacteur nucléaire
FR2471229A1 (fr) Machine de polissage de tuyaux metalliques
EP0403327B1 (fr) Procédé et dispositif de remplacement d'une canne chauffante d'un pressuriseur d'un réacteur nucléaire à eau sous pression
CA2084232C (fr) Cylindre pour une machine de coulee continue de bandes metalliques, machine de coulee continue correspondante et procede de realisation d'un tel cylindre
EP0616336B1 (fr) Procédé et dispositif de remplacement d'un adaptateur de traversée du couvercle de la cuve d'un réacteur nucléaire
CA1110430A (fr) Procede d'elimination des contraintes residuelles produites dans un tube par une operation de sertissage et outillage pour la mise en oeuvre de ce procede
FR2694654A1 (fr) Procédé et dispositif d'usinage de la surface interne d'une pièce tubulaire et notamment d'un adaptateur fixé sur le couvercle de la cuve d'un réacteur nucléaire à eau sous pression.
FR2684582A1 (fr) Dispositif d'usinage par decoupe de la surface circonferentielle interieure d'un tuyau de petit diametre a paroi epaisse.
FR2684319A1 (fr) Procede de fabrication d'un tuyau de petit diametre a paroi epaisse.
FR2633207A1 (fr) Procede d'usinage de finition de deux aretes opposees d'une meme piece et dispositif pour la mise en oeuvre du procede
FR2464784A1 (fr) Procede et appareil d'usinage par electro-erosion
FR2600919A1 (fr) Procede et dispositif pour la retouche due a l'usure des cylindres d'un laminoir, sur la ligne de laminage
FR2570970A1 (fr) Procede d'usinage applique notamment aux augets de roues de turbine, les moyens et la machine de mise en oeuvre de ce procede.
FR2483294A1 (fr) Procede et dispositif pour la figuration et la realisation d'enveloppes et surfaces de corps creux a conicite exterieure ou interieure
FR2756631A1 (fr) Procede et dispositif de prelevement d'un echantillon dans une paroi metallique et utilisation
CN109500412B (zh) 一种复合式精密硬质合金活动顶尖及其使用方法
EP0661136A1 (fr) Procédé de rodage de la surface d'une pièce et rodoir pour la mise en oeuvre de ce procédé
FR2584008A1 (fr) Dispositif a usiner les surfaces cylindriques de pieces du type arbre par coupe et deformation durcissante
FR2462216A1 (fr) Outil pour l'usinage des surfaces internes de pieces par deformation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE DE ES FR IT SE

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE DE ES FR IT SE

17P Request for examination filed

Effective date: 19960518

17Q First examination report despatched

Effective date: 19970912

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19980302