WO1990007071A1 - Dispositifs et structures mecaniques - Google Patents

Dispositifs et structures mecaniques Download PDF

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Publication number
WO1990007071A1
WO1990007071A1 PCT/GB1989/001512 GB8901512W WO9007071A1 WO 1990007071 A1 WO1990007071 A1 WO 1990007071A1 GB 8901512 W GB8901512 W GB 8901512W WO 9007071 A1 WO9007071 A1 WO 9007071A1
Authority
WO
WIPO (PCT)
Prior art keywords
components
damping material
mutually opposed
damping
stator
Prior art date
Application number
PCT/GB1989/001512
Other languages
English (en)
Inventor
Kevin Lindsey
Original Assignee
National Research Development Corporation
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 National Research Development Corporation filed Critical National Research Development Corporation
Publication of WO1990007071A1 publication Critical patent/WO1990007071A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • 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
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/03—Stationary work or tool supports
    • 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
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • 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
    • B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/02—Sliding-contact bearings
    • F16C29/025—Hydrostatic or aerostatic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
    • F16F15/0235—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means where a rotating member is in contact with fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General build up of machine tools, e.g. spindles, slides, actuators

Definitions

  • MECHANICAL DEVICES AND STRUCTURES This invention relates to mechanical devices and structures, and in particular to the damping of vibrations therein.
  • this object can be achieved by the provision of a layer of damping material between suitably shaped spaced surfaces of adjacent components of the mounting structure.
  • a mechanical structure having a pair of cooperating components separated by a layer of vibration-damping material, wherein the geometry of the interface between said components is adapted so that said damping material will inhibit vibrations of said components.
  • the said components are mounted for rectilinear motion relative to one another and are formed with mutually opposed surfaces, for example plane surfaces, extending parallel to the direction of such relative motion with the said damping material disposed in a clearance between them.
  • the said components are mounted for rotation, relative to one another, about an axis of rotation, and are formed with mutually opposed surfaces, for example cylindrical surfaces, which are surfaces of rotation about that axis and which have the said damping material disposed in a clearance between them.
  • Figure 1 is a front elevational view of a tetrahedral mounting device for a machine tool, a modification of an embodiment of the tool described in U.K. Patent Application No.2194182A;
  • Figure 2 is a lateral sectional view, on the line II—II of Figure 1, of the mounting device and machine tool shown in Figure 1 ;
  • Figure 3 is a section, on a larger scale, through a workpiece mounting table for the machine tool.
  • Figure 4 is a section, on a larger scale, through a toolholder shown in Figures 1 and 2.
  • 2194182A includes six rod-like members la - If. Each member comprises a tubular outer strut 2a - 2f enclosing a tensile rod
  • each sphere comprises a pair of mating hemispheres 5a - 5d, 6a - 6d.
  • the halves of the hemispheres are held together by threaded bolts 7.
  • Each sphere abuts the outer strut of three of the rod-like members and is clamped thereto by means of bolts 8 attached to the ends of the corresponding enclosed tensile rod.
  • Mounted on the rod-like members la, lb and lc which are remote from the base constituted by members Id, le and If is a machine tool holder 9.
  • the machine tool holder is clamped to rod-like members la, lb and lc by means of threaded bolts 10 and space blocks 11.
  • the machine tool holder 9 and the hollow sphere 4d have respective bores 12 and 21, coaxial with the machine principal axis 13, through which passes a drive shaft 14 carrying an air bearing spindle having a rotor
  • the stator has an extension 15C to provide an extended viscous damping workface
  • a vee slideway 17 Mounted on the base rod-like members Id, le and If is a vee slideway 17 bearing a workpiece holder 18 to impart linear motion to a workpiece 19 beneath the grinding tool 16.
  • the workpiece holder is provided with a dividing strip 18A.
  • Interfaces 18B are provided with a viscous damping medium.
  • the slideway has a hollowed-out portion 20 so that the wall thickness is similar to that of the other structural components.
  • the hollow sphere remote from the base contains a bore 21 through which the drive shaft passes.
  • the geometry of the damping interface can be matched to the modes of the vibration expected or most needing attenuation, for instance the plane vertical damping interfaces between the driving strip of the sliding workpiece holder 18 and the matching slot in the vee slideway 17 will respond efficiently to horizontal mode vibrations from the drive to the sliding workpiece holder and the principal axis (vertical) vibrations; whereas the cylindrical damping interface between the stator of the air bearing rotary spindle 15 and the bore of the machine tool holder 9 will respond efficiently to torsional vibrations from the rotary spindle and to principal axis (vertical) vibrations. Similarly, appropriate vibrational damping may be provided in the spherical coupling between the drive shaft 14 and the rotor 15A.
  • the thickness of the viscous damping layer i.e. the gap between the solid surfaces thus comprising the damping interface
  • the thickness of the viscous damping layer can be 50 micrometres or greater with suitably high-viscosity damping fluids, so that no tribological (fretting, pick up, wear) problems will arise with dimensional tolerances within normal engineering practice. Close proximity of the two surfaces, as on some existing machines, is not needed; this again avoids tribological problems, and the inconsistent vibration damping which frequently results from stick-slip when the two surfaces are in close proximity or intermittent contact.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Machine Tool Units (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Abstract

Dans une structure mécanique comprenant une paire de composants travaillant en coopération et séparés par une couche de matériau amortisseur de vibrations, la géométrie des surfaces constituant l'interface entre les composants est conçue de sorte que le matériau amortisseur empêche toute vibration des composants. Le matériau amortisseur, qui peut être constitué par de l'air ou par un autre fluide, est placé entre une languette longitudinale (18A) d'un composant (18) et une rainure longitudinale (18B) d'un composant (17) sur lequel le composant (18) coulisse linéairement; dans une variante, ce matériau est placé entre une broche rotative mue (15A) et un stator faisant office de palier (15B), dans lequel la broche est montée, et dans un espace annulaire (15D) compris entre le stator (15B), ainsi qu'un prolongement annulaire (15C) de celui-ci, et le corps circonvoisin d'un porte-outil (9) dans lequel est monté le stator (15B).
PCT/GB1989/001512 1988-12-22 1989-12-20 Dispositifs et structures mecaniques WO1990007071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888829945A GB8829945D0 (en) 1988-12-22 1988-12-22 Mechanical devices and structures
GB8829945.8 1988-12-22

Publications (1)

Publication Number Publication Date
WO1990007071A1 true WO1990007071A1 (fr) 1990-06-28

Family

ID=10648951

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/001512 WO1990007071A1 (fr) 1988-12-22 1989-12-20 Dispositifs et structures mecaniques

Country Status (4)

Country Link
EP (1) EP0449869A1 (fr)
JP (1) JPH04502357A (fr)
GB (1) GB8829945D0 (fr)
WO (1) WO1990007071A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6467826B2 (en) * 1998-06-18 2002-10-22 C-Power Ab Tool holder

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255449B (de) * 1958-07-26 1967-11-30 Robert Ohrnberger Dipl Ing Vorrichtung zur Lagerung und Klemmung der Arbeitsspindeln von Werkzeugmaschinen, insbesondere Bohr- und Fraeswerken
US3485115A (en) * 1968-06-07 1969-12-23 Singer General Precision Rotary position mechanism
US3522864A (en) * 1968-05-08 1970-08-04 Cincinnati Milling Machine Co Tuned vibration damper assembly for machine tools
US3747470A (en) * 1970-08-15 1973-07-24 Nippon Seiko Kk Spindle provided with an anti-vibration mechanism
FR2334889A1 (fr) * 1975-12-13 1977-07-08 Messerschmitt Boelkow Blohm Amortisseur de vibrations
JPS58165939A (ja) * 1982-03-23 1983-10-01 Mitsubishi Heavy Ind Ltd テ−ブル構造
FR2536485A1 (fr) * 1982-11-22 1984-05-25 Girodin Tech Suspension antivibratoire
EP0113619A1 (fr) * 1982-12-15 1984-07-18 Rocamat Dispositif pour la coupe de blocs de granit, marbres, pierres et autres produits analogues
US4517852A (en) * 1980-06-04 1985-05-21 Nippin Seiko Kabushiki Kaisha Carriage apparatus
JPS62151638A (ja) * 1985-12-24 1987-07-06 Oiles Ind Co Ltd 粘性せん断抵抗を利用した回転式振動減衰装置
JPS631834A (ja) * 1986-06-19 1988-01-06 Showa Electric Wire & Cable Co Ltd 制振定盤

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255449B (de) * 1958-07-26 1967-11-30 Robert Ohrnberger Dipl Ing Vorrichtung zur Lagerung und Klemmung der Arbeitsspindeln von Werkzeugmaschinen, insbesondere Bohr- und Fraeswerken
US3522864A (en) * 1968-05-08 1970-08-04 Cincinnati Milling Machine Co Tuned vibration damper assembly for machine tools
US3485115A (en) * 1968-06-07 1969-12-23 Singer General Precision Rotary position mechanism
US3747470A (en) * 1970-08-15 1973-07-24 Nippon Seiko Kk Spindle provided with an anti-vibration mechanism
FR2334889A1 (fr) * 1975-12-13 1977-07-08 Messerschmitt Boelkow Blohm Amortisseur de vibrations
US4517852A (en) * 1980-06-04 1985-05-21 Nippin Seiko Kabushiki Kaisha Carriage apparatus
JPS58165939A (ja) * 1982-03-23 1983-10-01 Mitsubishi Heavy Ind Ltd テ−ブル構造
FR2536485A1 (fr) * 1982-11-22 1984-05-25 Girodin Tech Suspension antivibratoire
EP0113619A1 (fr) * 1982-12-15 1984-07-18 Rocamat Dispositif pour la coupe de blocs de granit, marbres, pierres et autres produits analogues
JPS62151638A (ja) * 1985-12-24 1987-07-06 Oiles Ind Co Ltd 粘性せん断抵抗を利用した回転式振動減衰装置
JPS631834A (ja) * 1986-06-19 1988-01-06 Showa Electric Wire & Cable Co Ltd 制振定盤

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6467826B2 (en) * 1998-06-18 2002-10-22 C-Power Ab Tool holder

Also Published As

Publication number Publication date
EP0449869A1 (fr) 1991-10-09
GB8829945D0 (en) 1989-02-15
JPH04502357A (ja) 1992-04-23

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