WO1996009913A1 - A work table for machine tools, machining centres and similar - Google Patents

A work table for machine tools, machining centres and similar Download PDF

Info

Publication number
WO1996009913A1
WO1996009913A1 PCT/EP1995/003739 EP9503739W WO9609913A1 WO 1996009913 A1 WO1996009913 A1 WO 1996009913A1 EP 9503739 W EP9503739 W EP 9503739W WO 9609913 A1 WO9609913 A1 WO 9609913A1
Authority
WO
WIPO (PCT)
Prior art keywords
platform
wings
machine tools
diameter
similar
Prior art date
Application number
PCT/EP1995/003739
Other languages
French (fr)
Inventor
Roberto Colombo
Original Assignee
Technai Team S.R.L.
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 Technai Team S.R.L. filed Critical Technai Team S.R.L.
Priority to AU36520/95A priority Critical patent/AU3652095A/en
Publication of WO1996009913A1 publication Critical patent/WO1996009913A1/en

Links

Classifications

    • 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
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • B23Q1/52—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism a single rotating pair
    • 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
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/10—Driving main working members rotary shafts, e.g. working-spindles driven essentially by electrical means

Definitions

  • the present invention concerns a worktable for machine tools, machining centres and the like for the turning and milling of workpieces, of the type comprising a platform of predetermined diameter supported for rotation about an axis by a base, and rotatable by drive means.
  • machining especially when pieces are of medium or large dimensions, demands that several turning operations, and a similar number of milling operations, are performed with a single positioning of the piece.
  • turning operation is understood to mean working in which the platform is rotated at a predetermined working speed and is controlled by a velocity feed-back system, in the so-called mandrel mode.
  • milling operation means those operations in which the platform is rotated at a predetermined speed, for example of advance, in a position feed-back system, in the so- called axial mode.
  • the object of the present invention is to devise a platform having structural and functional characteristics which satisfy the aforesaid requirement, while at the same time being of exceptionally simple construction.
  • This object is achieved by means of a work table of the specified type, characterised in that the drive means comprise a three-phase synchronous electric motor co ⁇ axial with the platform and in direct contact with it.
  • Figure 1 is a schematic perspective view in partial section of a table according to the invention.
  • Figure 2 is a schematic view of a detail of the table of Figure 1.
  • the reference numeral 1 indicates generally a work table for the turning and milling particularly of work pieces of medium and large dimensions.
  • the table 1 comprises a base 2 and a circular platform 3 of a predetermined diameter D1 selected between medium and large, starting from 1(300 rrm and suitable to withstand a torque of at least 3000 Nm.
  • the platform has a diameter Dl of 2500 mm.
  • the platform 3 is supported by the base 2 for rotation about a vertical axis X-X by means of rolling bearings 4 and is rotatable by drive means 5.
  • the transducer 6 preferably has a high resolution section 7 and a low resolution section 8.
  • a control unit 9 completes the table.
  • the drive means 5 for the table of the invention comprises a three-phase synchronous electric motor 10 which is coaxial with the platform 3.
  • the motor 10 is of a type known in itself which has already found various technical application. It is, for example, used to rotate telescopes for astronomical observation at very low velocities. A linear version is also used to drive high-speed transport means.
  • the motor 10 has a stator 11 fixed directly to the base 2 and a rotor 12 fixed directly to the platform 3, such that the motor is in direct contact with the platform itself.
  • the stator 11 comprises a predetermined number of C- section annular sectors 13 open towards the axis X-X and defining a cylindrical outer wall 14, having a diameter D2 substantially equal to the diameter Dl of the platform, and two flanges 15 and 16, respectively upper and lower, the lower flange being fixed to the base 2.
  • Windings 17 and 18 are positioned against the two flanges 15 and 16 respectively and define a cavity 19 between them.
  • Each annular sector 13 comprises two parallel plates 20 and 21, formed substantially as sectors of a circular ring and respectively constitute the C-shape flanges 15 and 16.
  • the two opposite circumferential ends of the plates 20 and 21 are attached to two identical radial spacer walls 22.
  • the two walls converge on the axis X-X at a pre ⁇ determined angle to each other, for example 30°.
  • the rotor 12 is in the form of a circular ring 23 and includes an outer annular portion 24 which carries, on its opposite faces, a plurality of magnets 25 constituting the poles, and which extends into the cavity 19 so as to define opposing air gaps with the windings 17 and 18.
  • the ring 23 further comprises an inner annular portion 26 which projects from the cavity 19 and is attached to the platform 3.
  • the control equipment 9 includes a power supply 27 connected to supply the motor 10 and a numeric control unit 28, having a mandrel control section 29 for controlling the platform during turning operations in a velocity feed-back system, and a control section 30 in the axial mode, for controlling the platform during milling operations in a position feed-back system.
  • the power supply 27 is connected to the unit 28 to receive a reference signal.
  • a switch 31 connects the supply 27 alternately to the section 29 and to the section 30 of the unit 28.
  • the numeric control unit 28 and the power supply 27 are connected to the transducer 6 to receive a feedback control signal.
  • a switch 32 connects the numeric control unit 28 and the power supply 27 alternately to the high resolution part 7 and to the low resolution part 8 of the transducer 6 as necessary.
  • the table according to the invention has the advantage of an exceptionally simple construction so that practically indefinite operation can be expected without the necessity of periodic overhauling, maintenance and adjustment.
  • the platform is in fact driven to rotate constantly without play and without the backlash typical of transmissions including kinematic chains with reduction gears, used until now.
  • the table according to the invention can, in addition, be an accessory for use as a machine tool or machining centre, or as an integral part of it, enabling improved performance in either case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Multi-Process Working Machines And Systems (AREA)
  • Turning (AREA)

Abstract

A work table (1) for machine tools, machining centres and similar, for turning and milling, which is of exceptionally simple construction, comprising a platform (3) of a predetermined diameter, rotatably supported by a base (2) about an axis (X-X) and rotated by a three-phase synchronous electric motor (10) co-axial with the platform (3) and in direct contact with it.

Description

A WORK TABLE FOR MACHINE TOOLS, MACHINING CENTRES AND
SIMILAR
The present invention concerns a worktable for machine tools, machining centres and the like for the turning and milling of workpieces, of the type comprising a platform of predetermined diameter supported for rotation about an axis by a base, and rotatable by drive means.
As is known, machining, especially when pieces are of medium or large dimensions, demands that several turning operations, and a similar number of milling operations, are performed with a single positioning of the piece.
The term turning operation is understood to mean working in which the platform is rotated at a predetermined working speed and is controlled by a velocity feed-back system, in the so-called mandrel mode. The term milling operation, however, means those operations in which the platform is rotated at a predetermined speed, for example of advance, in a position feed-back system, in the so- called axial mode.
The object of the present invention is to devise a platform having structural and functional characteristics which satisfy the aforesaid requirement, while at the same time being of exceptionally simple construction. This object is achieved by means of a work table of the specified type, characterised in that the drive means comprise a three-phase synchronous electric motor co¬ axial with the platform and in direct contact with it.
Further characteristics and advantages of the table according to the present invention will become clear from the following description of a preferred embodiment given by way of non-limitative example, with reference to the accompanying drawings, in which:
Figure 1 is a schematic perspective view in partial section of a table according to the invention; and
Figure 2 is a schematic view of a detail of the table of Figure 1.
With reference to the accompanying drawings, the reference numeral 1 indicates generally a work table for the turning and milling particularly of work pieces of medium and large dimensions.
The table 1 comprises a base 2 and a circular platform 3 of a predetermined diameter D1 selected between medium and large, starting from 1(300 rrm and suitable to withstand a torque of at least 3000 Nm.
In the example the platform has a diameter Dl of 2500 mm.
The platform 3 is supported by the base 2 for rotation about a vertical axis X-X by means of rolling bearings 4 and is rotatable by drive means 5.
A transducer 6, for example an encoder, is supported by the base 2 and is activated by the platform 3. The transducer 6 preferably has a high resolution section 7 and a low resolution section 8.
A control unit 9 completes the table.
The drive means 5 for the table of the invention comprises a three-phase synchronous electric motor 10 which is coaxial with the platform 3.
The motor 10 is of a type known in itself which has already found various technical application. It is, for example, used to rotate telescopes for astronomical observation at very low velocities. A linear version is also used to drive high-speed transport means.
The motor 10 has a stator 11 fixed directly to the base 2 and a rotor 12 fixed directly to the platform 3, such that the motor is in direct contact with the platform itself.
The stator 11 comprises a predetermined number of C- section annular sectors 13 open towards the axis X-X and defining a cylindrical outer wall 14, having a diameter D2 substantially equal to the diameter Dl of the platform, and two flanges 15 and 16, respectively upper and lower, the lower flange being fixed to the base 2.
Windings 17 and 18 are positioned against the two flanges 15 and 16 respectively and define a cavity 19 between them.
Each annular sector 13 comprises two parallel plates 20 and 21, formed substantially as sectors of a circular ring and respectively constitute the C-shape flanges 15 and 16. The two opposite circumferential ends of the plates 20 and 21 are attached to two identical radial spacer walls 22.
The two walls converge on the axis X-X at a pre¬ determined angle to each other, for example 30°.
The rotor 12 is in the form of a circular ring 23 and includes an outer annular portion 24 which carries, on its opposite faces, a plurality of magnets 25 constituting the poles, and which extends into the cavity 19 so as to define opposing air gaps with the windings 17 and 18. The ring 23 further comprises an inner annular portion 26 which projects from the cavity 19 and is attached to the platform 3.
The control equipment 9 includes a power supply 27 connected to supply the motor 10 and a numeric control unit 28, having a mandrel control section 29 for controlling the platform during turning operations in a velocity feed-back system, and a control section 30 in the axial mode, for controlling the platform during milling operations in a position feed-back system.
The power supply 27 is connected to the unit 28 to receive a reference signal. A switch 31 connects the supply 27 alternately to the section 29 and to the section 30 of the unit 28.
The numeric control unit 28 and the power supply 27 are connected to the transducer 6 to receive a feedback control signal. A switch 32 connects the numeric control unit 28 and the power supply 27 alternately to the high resolution part 7 and to the low resolution part 8 of the transducer 6 as necessary.
The table according to the invention has the advantage of an exceptionally simple construction so that practically indefinite operation can be expected without the necessity of periodic overhauling, maintenance and adjustment. The platform is in fact driven to rotate constantly without play and without the backlash typical of transmissions including kinematic chains with reduction gears, used until now. The table according to the invention can, in addition, be an accessory for use as a machine tool or machining centre, or as an integral part of it, enabling improved performance in either case.
Not the least advantage of the table according to the present invention is that it is of particularly compact dimensions.
Obviously, a person skilled in the art would be able to introduce numerous modifications and variants to the table described above in order to satisfy contingent and specific requirements, all however remaining within the scope of the protection of the invention as defined in the following claims.

Claims

1. A work table (1) for machine tools, machining centres and similar, for the turning and milling of workpieces, of the type comprising a platform (3) of predetermined diameter (Dl) , supported for rotation about an axis (X-X) by a base (3) and rotatable by drive means (5) , characterised in that the drive means (5) comprise a three-phase synchronous electric motor (10) co-axial with the platform (3) and in direct contact with it.
2. A table (1) according to Claim 1, characterised in that the motor (10) has a stator (11) and a rotor (12) fixed directly to the base (2) and to the platform (3) respectively.
3. A table (1) according to Claim 2, characterised in that the stator (11) comprises a predetermined number of C-section annular sectors (13) with a cylindrical back (14) and two wings (15, 16), and windings (17, 18) positioned along the wings (15, 16) , defining an air gap (19).
4. A table (1) according to Claim 3, characterised in that the C-section is open towards the axis (X-X) and in that the cylindrical back (14) has a diameter (D2) substantially equal to the diameter of the platform (Dl) .
5. A table (1) according to Claim 4, characterised in that each annular sector (13) comprises two parallel plates (20, 21) shaped substantially like a sector of a circular ring, and constituting the wings (15, 16) of the C-shape and two substantially radial, C-shaped spacer walls (22) to which the plates (20, 21) are attached.
6. A table (1) according to Claim 5, characterised in that the rotor (12) comprises a circular ring (23) having an annular portion (24) which extends into the air gap
(19) and which carries a plurality of magnets (25) , and an annular portion (26) which projects from the air gap (19) and which is attached to the platform (3) .
PCT/EP1995/003739 1994-09-29 1995-09-22 A work table for machine tools, machining centres and similar WO1996009913A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36520/95A AU3652095A (en) 1994-09-29 1995-09-22 A work table for machine tools, machining centres and similar

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI94A001983 1994-09-29
ITMI941983A IT1270101B (en) 1994-09-29 1994-09-29 WORKPIECE TABLE FOR MACHINE TOOLS, MACHINING CENTERS AND SIMILAR

Publications (1)

Publication Number Publication Date
WO1996009913A1 true WO1996009913A1 (en) 1996-04-04

Family

ID=11369618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/003739 WO1996009913A1 (en) 1994-09-29 1995-09-22 A work table for machine tools, machining centres and similar

Country Status (3)

Country Link
AU (1) AU3652095A (en)
IT (1) IT1270101B (en)
WO (1) WO1996009913A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1046461A2 (en) * 1999-04-21 2000-10-25 DECKEL MAHO GmbH Universal machine tool
US6886225B2 (en) * 2002-09-24 2005-05-03 O.M.V. Officine Meccaniche Venete S.R.L. Worktable for numerical control machine tools
JP2015024452A (en) * 2013-07-24 2015-02-05 通雄 渡邊 A table device for machine tool
CN110480032A (en) * 2019-08-14 2019-11-22 徐州光圆国腾矿山设备制造有限公司 A kind of vertical lathe and its workbench mounting device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU431970A1 (en) * 1972-12-18 1974-06-15
JPS57132936A (en) * 1981-02-06 1982-08-17 Dai Ichi Seiko Co Ltd Turn table
EP0340681A2 (en) * 1988-05-05 1989-11-08 Friedrich Deckel Aktiengesellschaft Turning device for boring or milling machines
DE4128276A1 (en) * 1990-08-27 1992-03-05 Mitutoyo Corp ROTATIONAL DEVICE
JPH04289058A (en) * 1991-03-14 1992-10-14 Matsuura Kikai Seisakusho:Kk Rotation indexing table for machine tool
US5196749A (en) * 1991-09-23 1993-03-23 Rem Technologies, Inc. Stator support and positioning structure for a dynamoelectric machine
RU2028906C1 (en) * 1990-04-04 1995-02-20 Краснодарский политехнический институт Table of vertical boring and turning machine
JPH1129756A (en) * 1997-07-10 1999-02-02 Wako Sangyo Kk Adhesive and filter element formed using this adhesive

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU431970A1 (en) * 1972-12-18 1974-06-15
JPS57132936A (en) * 1981-02-06 1982-08-17 Dai Ichi Seiko Co Ltd Turn table
EP0340681A2 (en) * 1988-05-05 1989-11-08 Friedrich Deckel Aktiengesellschaft Turning device for boring or milling machines
RU2028906C1 (en) * 1990-04-04 1995-02-20 Краснодарский политехнический институт Table of vertical boring and turning machine
DE4128276A1 (en) * 1990-08-27 1992-03-05 Mitutoyo Corp ROTATIONAL DEVICE
JPH04289058A (en) * 1991-03-14 1992-10-14 Matsuura Kikai Seisakusho:Kk Rotation indexing table for machine tool
US5196749A (en) * 1991-09-23 1993-03-23 Rem Technologies, Inc. Stator support and positioning structure for a dynamoelectric machine
JPH1129756A (en) * 1997-07-10 1999-02-02 Wako Sangyo Kk Adhesive and filter element formed using this adhesive

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 7525, Derwent World Patents Index; Class P54, AN 75-G5240W *
DATABASE WPI Section PQ Week 9538, Derwent World Patents Index; Class P56, AN 95-291322 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 381 (E - 810) 23 August 1989 (1989-08-23) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 96 (M - 1372) 25 February 1993 (1993-02-25) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 232 (M - 172)<1110> 18 November 1992 (1992-11-18) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1046461A2 (en) * 1999-04-21 2000-10-25 DECKEL MAHO GmbH Universal machine tool
EP1046461A3 (en) * 1999-04-21 2001-01-17 DECKEL MAHO GmbH Universal machine tool
SG87101A1 (en) * 1999-04-21 2002-03-19 Deckel Maho Gmbh Universal machine tool
US6904652B2 (en) 1999-04-21 2005-06-14 Deckel Maho Gmbh Universal machine tool
DE19918082B4 (en) * 1999-04-21 2005-09-08 Deckel Maho Gmbh Universal Machine Tool
US6886225B2 (en) * 2002-09-24 2005-05-03 O.M.V. Officine Meccaniche Venete S.R.L. Worktable for numerical control machine tools
JP2015024452A (en) * 2013-07-24 2015-02-05 通雄 渡邊 A table device for machine tool
CN110480032A (en) * 2019-08-14 2019-11-22 徐州光圆国腾矿山设备制造有限公司 A kind of vertical lathe and its workbench mounting device
CN110480032B (en) * 2019-08-14 2020-12-29 徐州光圆国腾矿山设备制造有限公司 Vertical lathe and workbench mounting device thereof

Also Published As

Publication number Publication date
ITMI941983A1 (en) 1996-03-29
ITMI941983A0 (en) 1994-09-29
AU3652095A (en) 1996-04-19
IT1270101B (en) 1997-04-28

Similar Documents

Publication Publication Date Title
US5584621A (en) Direct drive multiple axes rotary spindle head for milling machine
US6925694B2 (en) Tool turret
US6216798B1 (en) Work unit for machine tool, with linear electric motor for axial movement of the spindle
US5704826A (en) Machine for grinding rotor blades provided with a multiwheel head
JPH05502627A (en) Spindle drives for driving machine tools or other machines
CA2280566A1 (en) Portable journal turning lathe
KR20050024333A (en) Self-Propelled Road Milling Machine
US5720090A (en) Machining apparatus with modular machine tools
US20100207496A1 (en) Angular indexing apparatus for machine tool
EP0595070B1 (en) Grinding wheel spindle equipment
US20100126308A1 (en) Angular indexing apparatus for machine tool
WO1996009913A1 (en) A work table for machine tools, machining centres and similar
US6886225B2 (en) Worktable for numerical control machine tools
CN111482502A (en) Rotary radial feeding numerical control spinning machine
US3841198A (en) Gear cutting machine with means for continuously controlling the position of the tool in accordance with the position of the carriage
AU645950B2 (en) Spindle drive
CN205342664U (en) Numerical control machine tool
CN100563919C (en) Direct driving type mainshaft head assembly and manufacture method thereof and comprehensive machine
CN110976953B (en) Narrow space axial pinhole processingequipment
CN217166674U (en) Milling head rotating device for numerical control gantry machining center
CN204843534U (en) Composite rotors numerical control revolving stage
CN219025946U (en) Z-axis spindle box and five-axis machining center with same
JP2520519Y2 (en) 2-axis tilt table device
JPS63105810A (en) Lathe broaching tool
CN211889077U (en) Narrow space axial pinhole processingequipment

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AT AU BB BG BR BY CA CH CN CZ DE DK EE ES FI GB GE HU IS JP KE KG KP KR KZ LK LR LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TT UA UG US UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE MW SD SZ UG AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA