FR1306087A - Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils - Google Patents

Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils

Info

Publication number
FR1306087A
FR1306087A FR871919A FR871919A FR1306087A FR 1306087 A FR1306087 A FR 1306087A FR 871919 A FR871919 A FR 871919A FR 871919 A FR871919 A FR 871919A FR 1306087 A FR1306087 A FR 1306087A
Authority
FR
France
Prior art keywords
moving parts
machine tools
controlling movements
movements
controlling
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
Application number
FR871919A
Other languages
English (en)
Inventor
Ragnar Leonard Carlstedt
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 filed Critical
Priority to FR871919A priority Critical patent/FR1306087A/fr
Application granted granted Critical
Publication of FR1306087A publication Critical patent/FR1306087A/fr
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/04—Arrangements preventing overload of tools, e.g. restricting load
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/36—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission in which a servomotor forms an essential element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • B23Q5/404—Screw bearings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B2015/1495—Characterised by the construction of the motor unit of the straight-cylinder type with screw mechanism attached to the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/75—Control of speed of the output member
    • 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
    • Y10T408/65—Means to drive tool
    • Y10T408/675—Means to drive tool including means to move Tool along tool-axis
    • Y10T408/6757—Fluid means
    • 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
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/304536—Milling including means to infeed work to cutter
    • Y10T409/305936—Milling including means to infeed work to cutter including fluid drive
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
    • Y10T74/18688—Limit stop
    • 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
    • Y10T82/00—Turning
    • Y10T82/13—Pattern section
    • 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
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • 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
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • Y10T82/2549—Feedscrews and rods

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)
  • Press Drives And Press Lines (AREA)
FR871919A 1961-07-26 1961-08-30 Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils Expired FR1306087A (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR871919A FR1306087A (fr) 1961-07-26 1961-08-30 Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1961C0024724 DE1402920A1 (de) 1961-07-26 1961-07-26 Verfahren und Vorrichtung zur Steuerung der Bewegungen beweglicher Teile,insbesondere von Werkzeugmaschinen u.dgl.
FR871919A FR1306087A (fr) 1961-07-26 1961-08-30 Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils

Publications (1)

Publication Number Publication Date
FR1306087A true FR1306087A (fr) 1962-10-13

Family

ID=7017711

Family Applications (1)

Application Number Title Priority Date Filing Date
FR871919A Expired FR1306087A (fr) 1961-07-26 1961-08-30 Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils

Country Status (4)

Country Link
US (2) US3083592A (fr)
DE (1) DE1402920A1 (fr)
FR (1) FR1306087A (fr)
GB (1) GB967212A (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182526A (en) * 1962-12-26 1965-05-11 Buhr Machine Tool Company Motorized machine tool way unit
US3439581A (en) * 1966-08-15 1969-04-22 Res Designing Services Inc Slide unit
US3469476A (en) * 1966-11-26 1969-09-30 Hoesch Maschinenfabrik Ag Turning lathe
DE1752834C3 (de) * 1967-07-29 1979-01-25 Ing. C. Olivetti & C., S.P.A., Ivrea, Turin (Italien) Antrieb für die Spindel einer Bohr- oder Fräsmaschine
US3495806A (en) * 1967-10-26 1970-02-17 John R Sutton Apparatus for raising and lowering an off-shore platform
US4115026A (en) * 1975-08-06 1978-09-19 Sloan Valve Company Lead screw tapping arrangement for use with self-opening die heads and collapsible taps
US4359206A (en) * 1980-09-19 1982-11-16 Mccreery Robert B Severe duty hydraulic cylinder with continuously effective locking device
US4557746A (en) * 1983-08-04 1985-12-10 Emhart Industries, Inc. Electro-pneumatic actuator for glassware forming machine
CH668103A5 (de) * 1984-05-29 1988-11-30 Sig Schweiz Industrieges Anordnung zum verstaerken der antriebskraft eines steuermotors bei einem linearen stellantrieb.
DE69400564T2 (de) * 1993-10-12 1997-04-10 Smc Kk Servozylindervorrichtung
JP5040666B2 (ja) * 2008-01-15 2012-10-03 株式会社ジェイテクト ボールねじ装置
CN108730249B (zh) * 2018-05-25 2020-08-07 太原理工大学 一种液电混合驱动的多自由度平台
CN108412821B (zh) * 2018-05-25 2020-01-07 太原理工大学 一种液电混合驱动的行走机器人
CN118848615B (zh) * 2024-07-01 2025-02-28 山东建筑大学 一种降低双丝杠工作台误差偏转角的控制方法及系统
CN118809266B (zh) * 2024-09-18 2024-12-06 南安市跃之志机械发展有限公司 一种大型螺丝生产加工用数控车床

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2367492A (en) * 1943-02-03 1945-01-16 Fitchburg Engineering Corp Machine tool control
US2587352A (en) * 1948-01-27 1952-02-26 Barnes Drill Co Thread-cutting machine having rapid traverse plus positive controlled feed
US2529753A (en) * 1948-11-20 1950-11-14 John C Williams Vertical boring machine
BE502099A (fr) * 1951-02-12
US2891380A (en) * 1954-09-13 1959-06-23 Gen Motors Corp Dual drive actuator and control means therefor
FR1165754A (fr) * 1957-01-31 1958-10-29 Cazeneuve Sa Dispositif d'asservissement de l'avance des chariots ou autres dans les machinesoutils
US2958232A (en) * 1958-08-22 1960-11-01 Pipe Machinery Company Feed and rapid return device for machine tools

Also Published As

Publication number Publication date
US3083592A (en) 1963-04-02
DE1402920A1 (de) 1969-03-27
GB967212A (en) 1964-08-19
US3251249A (en) 1966-05-17

Similar Documents

Publication Publication Date Title
FR1306087A (fr) Procédé et appareil pour la commande des mouvements d'éléments mobiles, par exemple dans les machines-outils
BE606794A (fr) Procédé et appareil pour raser des piqûres d'articles de bonneterie.
FR1464257A (fr) Procédé et dispositif pour l'usinage électrochimique
CH413966A (fr) Procédé et appareil de commande automatique d'un déplacement, notamment dans une machine-outil
CH369415A (fr) Dispositif de serrage pour machine-outil et procédé pour sa fabrication
FR1356521A (fr) Procédé et appareil pour l'usinage électrolytique
FR1389286A (fr) Procédé et appareils pour l'usinage électrochimique des métaux
BE581992A (fr) Mécanisme et procédé pour la conduite d'opérations de frittage
FR1499116A (fr) Procédé et appareil pour la coulée et le moulage lents des métaux
CH389800A (fr) Procédé et machine pour l'usinage électrolytique
FR1379900A (fr) Procédé pour mesurer des pièces minuscules en cours d'usinage
CH384146A (de) Stranggiessmaschine und Verfahren zu ihrem Betrieb
CH373834A (fr) Machine pour l'usinage par électro-érosion
FR1349491A (fr) Procédé et appareil pour l'usinage électrochimique des métaux
FR1367919A (fr) Procédé pour le réglage des machines d'agglomération
FR85224E (fr) Procédé et appareil pour l'usinage d'engrenages par rasage
FR1336150A (fr) Procédé et appareil pour l'usinage électrolytique
FR1355159A (fr) Procédé et composition pour le nettoyage de métaux
FR1361454A (fr) Procédé et dispositif pour le travail continu de pièces en forme de bandes de matières flexibles
FR1286594A (fr) Procédé et dispositif pour la commande des opérations d'une machine-outil
FR1301606A (fr) Procédé et appareil perfectionné pour l'agglomération ou le frittage
FR1294923A (fr) Procédé et machine pour affûter les entrées des filières de décolletage
BE605725A (fr) Procédé et dispositif pour la coulée de pièces en matière réfractaire.
FR1322098A (fr) Procédé et dispositif pour la coulée de pièces en matière réfractaire
FR1309444A (fr) Procédé et appareil pour l'usinage de la surface intérieure des pièces creuses métalliques