EP2205394A2 - Direct drive two rotary axis spindle head - Google Patents

Direct drive two rotary axis spindle head

Info

Publication number
EP2205394A2
EP2205394A2 EP08803741A EP08803741A EP2205394A2 EP 2205394 A2 EP2205394 A2 EP 2205394A2 EP 08803741 A EP08803741 A EP 08803741A EP 08803741 A EP08803741 A EP 08803741A EP 2205394 A2 EP2205394 A2 EP 2205394A2
Authority
EP
European Patent Office
Prior art keywords
axis
motor
fork
rotor
direct drive
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Withdrawn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
EP08803741A
Other languages
German (de)
French (fr)
Inventor
Roberto Colombo
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.)
Technai Team Srl
Original Assignee
Technai Team Srl
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 Srl filed Critical Technai Team Srl
Publication of EP2205394A2 publication Critical patent/EP2205394A2/en
Withdrawn legal-status Critical Current

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
    • B23Q1/54—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 two rotating pairs only
    • B23Q1/5406—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 two rotating pairs only a single rotating pair followed perpendicularly by 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
    • 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
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or spindles
    • 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
    • B23Q2210/00—Machine tools incorporating a specific component
    • B23Q2210/004—Torque motors
    • 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
    • B23Q2220/00—Machine tool components
    • B23Q2220/006—Spindle heads

Definitions

  • a duct in the casting of the stator 11 of the second motor 9 it is a stainless steel cooling coil 23.
  • the cooling fluid thus flows in proximity, to the extent possible given the presence of the stator windings and rotor magnets, of the rotor 10 of the second motor 9, so as to improve the functioning thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)

Abstract

It is described a direct drive two rotary axis spindle head (1) comprising a fork (5), rotatable around a first axis (B), with two arms (3, 4) accommodating between them an electric spindle (2). The electric spindle (2) is rotatable around a second axis (A) perpendicular to said first axis (B). A first direct drive electric motor (6) for the rotation of the fork (5) around said first axis (B), and at least a second direct drive electric motor (9) for the rotation of the electric spindle (2) around said second axis (A). The second motor (9) comprises a rotor (10) and a stator (11), where the stator (11) is housed in a casing (12) fixed to the outer faces (13, 14) of the fork (5), in such a way that the casing (12) and part of the rotor (10) remain on the outside of the fork (5).

Description

"Direct drive two rotary axis spindle head". DESCRIPTION
The present invention relates to a direct drive two rotary axis spindle head.
Means for driving electric spindle heads to follow the contour of parts requiring complex machining processes that involve abrupt changes in the surface being machined and thus require rapid changes in the tilt angle of the tool, as is the case, for example, of machining processes in the aeronautics industry, are known. Such heads are preferably equipped with direct drive motors, which provide a faster response compared to a transmission of motion in which a servo motor transmits rotational motion by means of a gear reduction unit.
An example of this type is provided by document EP-B 1-885081, which illustrates a spindle head with a first motor that rotates a fork around its longitudinal axis, and a second motor on the fork that rotates an electric spindle, coupled to said fork, around an axis perpendicular to the first, the electric spindle being equipped with a motor of its own for driving the tools. The second motor comprises two units that define the second axis and are mounted in two cylindrical cavities of the fork, which enclose said units, which, due to the type of fork, are substantially inaccessible once they have been mounted on it.
This solution has an evident disadvantage in terms of the overall dimensions of the fork, which must be increased in order to accommodate the units of the second motor, with the drawback, as compared to more agile solutions, of precluding access to narrower recesses. One may moreover assume that there will be some problems in actuating and verifying the centring of the electric spindle in relation to the second axis of rotation in this type of solution. The object of the present invention is thus to provide a direct drive two rotary axis spindle head without any of the aforesaid drawbacks.
According to the invention this object is achieved with a direct drive two rotary axis spindle head comprising a fork, rotatable around a first axis, with two arms pivotably accommodated between which is an electric spindle rotatable around a second axis perpendicular to said first axis, a first direct drive electric motor for the rotation of the fork around said first axis and at least a second direct drive electric motor for the rotation of the electric spindle around said second axis, characterised in that the second motor comprises a rotor and a stator, where the stator is housed in a casing fixed to the outer faces of the fork so that the casing and part of the rotor remain on the outside of the fork.
These and other characteristics of the present invention will become more apparent from the following detailed description of two embodiments thereof, illustrated by way of a non-restrictive example in the appended drawings, in which: figure 1 shows a partially exploded axonometric view of a spindle head according to the invention; figure 2 shows an axonometric view of the fork of said spindle head; figure 3 shows a front view of the fork with the motor mounted; figure 4 shows a vertical section view taken along the line IV-IV of figure 3; figure 5 shows a vertical section view according to a plane passing through axes A and B of figure 1 ; figure 6 shows an enlarged detail of figure 5. With reference to the appended drawings, and in particular figures 1 and 5, one may note a spindle head 1 with an electric spindle 2 mounted between two arms 3 and 4 of a fork 5. The head 1 is equipped with a first direct drive electric motor 6, comprising a rotor 7 and a stator 8, for the rotation of the fork 5 around a first axis B longitudinal to the head 1. Two units of a second direct drive electric motor 9 are disposed on two arms 3 and 4 of the fork 5, and drive the rotation of the electric spindle 2 around a second axis A, perpendicular to the first axis B. The electric spindle 2 is equipped with its own motor (not illustrated), which drives the tools. It should be noted, with reference to figure 5, that the rotor 7 of the first motor 6 is directly flanged to the fork 5 for direct transmission of the rotational motion around the first axis B.
With reference to figures 1 and 6, it should be noted that each of the second electric motors 9 is formed by a rotor 10 and a stator 11, where the stator 11 is fixed to the fork 5 by means of a casing 12 of the second motor
9, and the casing 12, upon assembly, comes to rest against an outer vertical face 13 or 14 (the latter not illustrated) of the fork 5. The casing 12 and part of the stator 11 of the second motor 9 remain on the outside of the fork 5, also after assembly, and do not require a cylindrical structure of the fork 5 to enclose them, which is wholly advantageous in that it allows more compact dimensions, greater ease of construction and better manoeuvrability of the head 1.
It is useful to point out the advantages during the assembly and above all centring phases of such a configuration of the fork. Before and after assembly, the fork 5 maintains a degree of positive circumferential play in relation to the second motor 9, which permits it to be easily inserted into the arm 3 through a seat 15 of the fork 5, visible in figure 2, with the casing 12 resting against the outer face 13. The second motor 9 is fixed here without any particular attention to the position. The additional unit of the second motor 9 is inserted in the other arm 4 through an additional seat 16, left free, so that the additional casing 12 is resting against the outer face 14. Before being fixed definitively into place, the additional second motor 9, resting against the outer face 14, is adjusted in position until the desired centring is achieved between the two second motors 9. It appears evident that the centring operation is facilitated by this mode of assembly, which makes it possible to have ample clearance around each arm.
With reference in particular to figures 3 and 4, in order to favour the assembly and centring between the second motor 9 and the fork 5, the fork 5 is provided, on the arms 3 and 4, with seats 15 and 16 for accommodating the two units of the second motor 9. Each seat 15 and 16 has been shaped in such a way that the second motor 9 can be mounted with a predefined direction, which permits the coupling, with play, between a flaring 17, provided in each of the seats 15 and 16, and a projecting member 18 of complementary volume, with which each unit of the second motor 9 is provided.
The electric spindle 2 is assembled as follows: to a fastening shaft 19, integral with the electric spindle, a centring hub 20 is assembled; it is fixed to the rotor 10 of the second motor 9 and rests elsewhere upon bearings 21. As a further guarantee of correct functioning and centring, the head 1 may make use of a position retroaction device 22 to adjust the speed of the rotor 10 and effectively position the electric spindle 2 in relation to the second axis A.
With particular reference to figure 6, one may also note the presence of a duct in the casting of the stator 11 of the second motor 9: it is a stainless steel cooling coil 23. The cooling fluid thus flows in proximity, to the extent possible given the presence of the stator windings and rotor magnets, of the rotor 10 of the second motor 9, so as to improve the functioning thereof.

Claims

1. Direct drive two rotary axis spindle head (1) comprising a fork (5), rotatable around a first axis (B), with two arms (3, 4) accommodated between which is an electric spindle (2) rotatable around a second axis (A) perpendicular to said first axis (B), a first direct drive electric motor (6) for the rotation of the fork (5) around said first axis (B), and at least a second direct drive electric motor (9) for the rotation of the electric spindle (2) around said second axis (A), characterised in that the second motor (9) comprises a rotor (10) and a stator (11), where the stator (11) is housed in a casing (12) fixed to the outer faces (13, 14) of the fork (5), in such a way that the casing (12) and part of the rotor (10) remain on the outside of the fork (5).
2. Head according to claim 1, characterised in that the first motor (6) comprises a stator (8) and a rotor (7), where said rotor (7) is directly flanged to the fork (5) and directly transmits to it the motion of rotation around the axis (B).
3. Head according to claim 1 or 2, characterised in that the structure of the stator (11) of the second motor (9) comprises a cooling system located in proximity to the rotor (10) of the second motor (9).
4. Head according to claim 3, characterised in that the cooling system consists in a cooling duct.
5. Head according to claim 4, characterised in that the cooling duct is a stainless steel coil (23) embedded in the casting of the stator (11) of the second motor (9).
6. Head according to any of the claims 3 to 5, characterised in that cooling is achieved by means of a fluid.
7. Head according to any of the previous claims, characterised in that it is equipped with a position retroaction device (22) to adjust the speed of the rotor (10) of the second motor (9) and effectively position the second axis (A).
EP08803741A 2007-09-14 2008-09-05 Direct drive two rotary axis spindle head Withdrawn EP2205394A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20071773 ITMI20071773A1 (en) 2007-09-14 2007-09-14 "HEAD WITH SPINDLE HOLDER WITH TWO ROTARY AXIS AND DIRECT CONTROL"
PCT/EP2008/061772 WO2009034030A2 (en) 2007-09-14 2008-09-05 Direct drive two rotary axis spindle head

Publications (1)

Publication Number Publication Date
EP2205394A2 true EP2205394A2 (en) 2010-07-14

Family

ID=40042907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08803741A Withdrawn EP2205394A2 (en) 2007-09-14 2008-09-05 Direct drive two rotary axis spindle head

Country Status (3)

Country Link
EP (1) EP2205394A2 (en)
IT (1) ITMI20071773A1 (en)
WO (1) WO2009034030A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008051613B4 (en) * 2008-10-08 2010-07-01 Tramec Gmbh milling head
TWI417155B (en) 2010-07-20 2013-12-01 Ind Tech Res Inst Rotary spindle head with gear reducer
CN102091947A (en) * 2010-12-28 2011-06-15 齐齐哈尔二机床(集团)有限责任公司 Accessory type double pendulum angle milling head driven by alternating-current permanent-magnet synchronous inner rotor torque motor
CN103121167A (en) * 2013-01-25 2013-05-29 陈邕 Torque motor direct drive type A/C shaft double oscillation angle numerical control mill head
ITUA20162925A1 (en) 2016-04-27 2017-10-27 Cms Spa MACHINING HEAD WITH TWO ROTARY AXES
TWI636852B (en) 2017-10-26 2018-10-01 財團法人工業技術研究院 Direct drive two rotary axes machining head
DE102018000322A1 (en) 2018-01-17 2019-07-18 Detlef Görgens 5 axis milling head
CN108723796B (en) * 2018-06-29 2023-12-12 科德数控股份有限公司 Mechanical single pendulum head for five-axis composite machining center

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01222809A (en) * 1988-02-26 1989-09-06 Shin Nippon Koki Kk Machine tool
US5584621A (en) * 1995-06-13 1996-12-17 Bertsche Engineering Corp. Direct drive multiple axes rotary spindle head for milling machine
DE19850603A1 (en) * 1998-11-03 2000-05-11 Ds Technologie Werkzeugmaschin Milling cutter head unit, with cardan bearings for milling spindle
EP1870199B1 (en) * 2006-06-23 2008-12-24 Franz Kessler GmbH Multi-axis pivot head for a machine tool
EP1880796B2 (en) * 2006-07-18 2011-11-02 Franz Kessler GmbH Multi-axis pivot head for a machine tool
JP4996393B2 (en) * 2006-09-14 2012-08-08 津田駒工業株式会社 Machining head for machine tools
US7293340B1 (en) * 2006-12-15 2007-11-13 Roundtop Machinery Industries Co., Ltd Direct drive spindle, machining center and methods of fabricating the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009034030A2 *

Also Published As

Publication number Publication date
ITMI20071773A1 (en) 2009-03-15
WO2009034030A2 (en) 2009-03-19
WO2009034030A3 (en) 2009-06-04

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