WO1991004120A2 - Machine a raser les dentures - Google Patents

Machine a raser les dentures Download PDF

Info

Publication number
WO1991004120A2
WO1991004120A2 PCT/EP1990/001566 EP9001566W WO9104120A2 WO 1991004120 A2 WO1991004120 A2 WO 1991004120A2 EP 9001566 W EP9001566 W EP 9001566W WO 9104120 A2 WO9104120 A2 WO 9104120A2
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
bearing
hydrostatic
radial
support structure
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.)
Ceased
Application number
PCT/EP1990/001566
Other languages
English (en)
Other versions
WO1991004120A3 (fr
Inventor
Attilio Malandrone
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.)
Bocca & Malandrone Di Malandrone & C Sas
Original Assignee
Bocca & Malandrone Di Malandrone & C Sas
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 Bocca & Malandrone Di Malandrone & C Sas filed Critical Bocca & Malandrone Di Malandrone & C Sas
Publication of WO1991004120A2 publication Critical patent/WO1991004120A2/fr
Publication of WO1991004120A3 publication Critical patent/WO1991004120A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16C32/0662—Details of hydrostatic bearings independent of fluid supply or direction of load
    • F16C32/0666—Details of hydrostatic bearings independent of fluid supply or direction of load of bearing pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
    • B23F23/1237—Tool holders
    • B23F23/1281—Honing, shaving or lapping tool holders
    • 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
    • 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 buildup of machine tools, e.g. spindles, slides, actuators

Definitions

  • a gear-shaving machine The present invention relates to a gear-shaving machine.
  • Shaving is a finishing operation which consists of the elimination of deformities and roughness resulting from the gear-cutting operation.
  • the shaving blade is carried by a spindle mounted rotatably on the structure of the machine by means of rolling bearings, typically oblique ball bearings.
  • the ball bearings tend to wear quite quickly and the resulting play of the spindle affects the working accuracy of the shaving blade, causing anomalous working of the gear and bad finishing of the involutes.
  • mechanical corrections were performed on the shaving blade to compensate for the errors and the play of the spindle.
  • the object of the present invention is to provide a gear-shaving machine which overcomes the aforesaid problems and also enables the shaving blade to be replaced without the need for lengthy and complex operations.
  • a gear-shaving machine characterised in that it comprises a support structure with a hydrostatic unit for supporting a spindle carrying a shaving blade, the hydrostatic support unit including:
  • the said radial bearing being carried by a door which is articulated to the fixed support structure about an axis which is perpendicular to the longitudinal axis of the spindle but not incident thereon.
  • the spindle is, to advantage, rotated by an electric motor whose shaft is coaxial with the spindle and is connected directly thereto.
  • Figure 1 is a perspective view of a shaving machine according to the present invention
  • Figure 2 is an axial section of the machine of Figure 1
  • Figure 3 is a section taken on the line III-III of Figure 1.
  • a gear-shaving machine includes a fixed support structure 2 carrying a spindle 4 which is rotatable about its own longitudinal axis A and carries a shaving blade 6.
  • the spindle 4 is mounted on the support structure 2 by means of a hydrostatic support unit comprising a first radial hydrostatic bearing 8 arranged at one end 10 of the spindle 4 and a pair of radial hydrostatic bearings 12 arranged on a part of the spindle 4 which is on the opposite side of the shaving blade 6 from the end 10.
  • the hydrostatic support unit also includes an axial bearing 16 constituted by a pair of rings 17 which are fixed to the support structure 2 and whose end surfaces 18 face the opposite end faces 20 of a flange 22 formed on the spindle 4.
  • each radial bearing 8, 12 is constituted by three sectors 24, each of which has a cylindrical surface 26 facing the surface of the spindle 4.
  • Each sector 24 has a spherical seat 28 in the surface of the sector 24 opposite the cylindrical surface 26.
  • the spherical seat 28 in each sector 24 is engaged by a spherical head 30 of a bearing member 32 arranged in a respective hole 34 in the support structure 2.
  • Each bearing member 32 has a radial hole 36 which communicates with a respective pressurised-oil supply duct 38.
  • the hole 36 communicates with a groove 40 formed in the cylindrical surface 26 of the corresponding sector 24 through two radial holes 42, 44 formed in the spherical head 30 and in the sector 24 respectively.
  • the ducts 38 are connected to a hydraulic unit (not shown) which sends oil to the bearings 8, 12, and 16 at a pressure of approximately 3.5 bars.
  • the oil is kept circulating in the hydraulic unit and its circulation stabilises the temperature of the unit supporting the spindle 4.
  • the sectors 24 of the radial bearings 8, 12 and the rings 17 of the axial bearing 16 are kept spaced from the corresponding surfaces of the spindle 4 by oil films approximately 10 microns thick, preventing wear of the parts and the creation of both radial and axial play.
  • the radial bearing 8 at the end 10 of the spindle 4 is carried by a door 46 articulated to the support structure 2 about an axis B which is perpendicular to the longitudinal axis A of the spindle 4 but is not incident on the axis A ( Figure 1) .
  • the radial bearing 8 rotatably supports for rotation a sleeve 48 fixed to the end 10 of the spindle 4.
  • a conical cavity 50 is formed in the sleeve 48 and mates with a conical end shank 52 of the spindle 4.
  • the conical surfaces of the cavity 50 and the shank 52 are kept in mutual contact by the axial loading achieved by a screw 54 extending along the longitudinal axis A of the spindle 4.
  • the door 46 has a screw plug 56 which closes a hole 58 through which the head of the screw 54 is accessible through a further hole 60 formed in a plate 62 fixed to the sleeve 48.
  • the screw 54 whose head reacts against the plate 62, is unscrewed, causing the sleeve 48 to move away from the spindle 4 and thus opening the door 46.
  • the shaving blade 6 is accessible and can therefore be removed and replaced extremely easily and quickly.
  • the opposite end of the spindle 4 from the end 10 carrying the radial bearing 8 is connected directly to the shaft 64. of a brushless direct-current electric motor 65 by means of a coupling 66.
  • the direct connection of the motor 65 to the spindle 4 eliminates play in the kinematic mechanisms of the transmission which is usually interposed between the motor and the spindle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dry Shavers And Clippers (AREA)
  • Rolling Contact Bearings (AREA)
  • Gear Processing (AREA)

Abstract

La machine comprend une structure (2) de support fixe dotée d'une unité hydrostatique destinée à supporter une broche (4) portant une lame de rasage (6). Ladite unité de support hydrostatique comprend un premier palier hydrostatique radial (8) agencé à une extrémité (10) de ladite broche (4), une paire de paliers hydrostatiques radiaux (12) agencés sur une partie de ladite broche (4), laquelle se trouve du côté opposé de ladite lame de rasage (6) à partir de l'extrémité (10) portant le premier palier (8), un palier hydrostatique axial (16), ainsi qu'une unité oléodynamique destinée à alimenter en fluide lubrifiant sous pression les paliers. Le premier palier radial (8) est porté par une porte (46), laquelle est articulée par rapport à la structure de support fixe (2) autour d'un axe (B) perpendiculaire à l'axe longitudinal (A) de ladite broche (4) mais pas incident sur celle-ci.
PCT/EP1990/001566 1989-09-19 1990-09-14 Machine a raser les dentures Ceased WO1991004120A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT53350B/89 1989-09-19
IT8953350U IT217187Z2 (it) 1989-09-19 1989-09-19 Macchina per la rasatura di ingra naggi

Publications (2)

Publication Number Publication Date
WO1991004120A2 true WO1991004120A2 (fr) 1991-04-04
WO1991004120A3 WO1991004120A3 (fr) 1991-07-25

Family

ID=11282047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001566 Ceased WO1991004120A2 (fr) 1989-09-19 1990-09-14 Machine a raser les dentures

Country Status (2)

Country Link
IT (1) IT217187Z2 (fr)
WO (1) WO1991004120A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1757726A (en) * 1927-10-14 1930-05-06 Liebscher Paul Swiveling arbor support
GB732629A (en) * 1952-09-30 1955-06-29 Michigan Tool Co Improvements in or relating to an apparatus for shaving gears
DE2816176C2 (de) * 1978-04-14 1985-06-05 Marks Gmbh & Co Kg, 4350 Recklinghausen Fräswellenlagerung einer Fräswalze für eine Straßenfräse
DE3425880A1 (de) * 1984-07-13 1986-01-30 Carl Hurth Maschinen- und Zahnradfabrik GmbH & Co, 8000 München Vorrichtung zum herstellen oder bearbeiten von zahnraedern durch abwaelzen auf einem werkzeug mit abrasiver arbeitsflaeche
SU1210995A1 (ru) * 1984-07-13 1986-02-15 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Шпиндельный узел т желого металлорежущего станка
JPH0544013Y2 (fr) * 1986-03-11 1993-11-08

Also Published As

Publication number Publication date
WO1991004120A3 (fr) 1991-07-25
IT217187Z2 (it) 1991-11-12
IT8953350V0 (it) 1989-09-19

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