WO2002024401A1 - Double-rotatable spindle head for machine tools - Google Patents

Double-rotatable spindle head for machine tools Download PDF

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Publication number
WO2002024401A1
WO2002024401A1 PCT/EP2001/011063 EP0111063W WO0224401A1 WO 2002024401 A1 WO2002024401 A1 WO 2002024401A1 EP 0111063 W EP0111063 W EP 0111063W WO 0224401 A1 WO0224401 A1 WO 0224401A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
double
axis
rotatable
respect
Prior art date
Application number
PCT/EP2001/011063
Other languages
French (fr)
Inventor
Gabriele Piccolo
Original Assignee
Fpt Industrie S.P.A.
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 Fpt Industrie S.P.A. filed Critical Fpt Industrie S.P.A.
Priority to AU2002214991A priority Critical patent/AU2002214991A1/en
Publication of WO2002024401A1 publication Critical patent/WO2002024401A1/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
    • B23Q37/00—Metal-working machines, or constructional combinations thereof, built-up from units designed so that at least some of the units can form parts of different machines or combinations; Units therefor in so far as the feature of interchangeability is important
    • B23Q37/002—Convertible machines, e.g. from horizontally working into vertically working
    • 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
    • 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

Definitions

  • This invention relates to a double-rotatable spindle head for machine tools.
  • Double-rotatable heads for machine tools are known for machining three-dimensional surfaces, in particular for preparing light alloy moulds and models. They generally comprise two parts or half-heads, one of which (the first half-head) is able to rotate with respect to the machine structure about an axis, the other (second half-head) being able to rotate with respect to the first about a second axis at an angle to the preceding. Coordinated rotation of the two half-heads, generally by electric motors via a gear transmission system, enables the tool axis to be orientated in the desired direction in space.
  • the first half-head is of fork shape with its axis of rotation (first axis) perpendicular to the transverse arm thereof, and the second half-head, which supports the tool spindle, is hinged to the two parallel arms of the first half-head about an axis (second axis) parallel to the transverse arm thereof.
  • This known type of double-rotatable head in which rotating the second half-head with respect to the first half-head about the second axis results in movement of the tool axis in a vertical plane, with a range which can even reach + 110°, i.e. suitable for machining undercuts, presents a serious limitation related to the fork shape of the first half-head.
  • the first half-head is of substantially cylindrical shape with its axis coinciding with the first axis, the second half-head being positioned to the side of the first half-head, with the second axis perpendicularly cutting the first axis.
  • rotating the second half-head with respect to the first half-head about the second axis causes the tool axis to again move in a vertical plane but practically without any limitation.
  • the second half-head is coupled to the first half-head on a flat surface inclined at 45° to the first axis, the second axis being perpendicular to said flat surface.
  • the tool axis By rotating the second half-head with respect to the first half-head about the second axis, the tool axis describes a conical surface having an angle of 90° at its vertex, and can pass in particular from the vertical position, parallel to the first axis, to the horizontal position.
  • An object of the invention is to eliminate all the drawbacks jointly or separately encountered in known double-rotatable heads for machine tools, and in particular to provide a double-rotatable head which besides being able to work in close proximity to the three-dimensional surface to be machined, can also penetrate into cavities present in the workpiece and can also machine undercuts.
  • Another object of the invention is to provide a double-rotatable head practically without slack and friction, which generally exist in traditional heads and are the cause of positioning inaccuracies and the need for frequent adjustments for their reduction.
  • Figure 1 is a side view of a double-rotatable head of the invention in a configuration with the tool axis parallel to the first axis;
  • Figure 2 is a vertical section therethrough in the same configuration as Figure
  • the double-rotatable head of the invention comprises, in traditional manner, a first half-head 2 applied to the machine tool structure (not shown) via a connection element 4, and a second half-head 6 supporting the tool spindle 8.
  • the first half-head 2 can rotate with respect to the machine structure, and hence to the connection element 4 about a first axis 10 by virtue of the presence of guide bearings 12 applied to said connection element 4 and engaging a circumferential groove 14 provided in the casing of the first half-head 2.
  • the first half-head 2 is rotated with respect to the connection element 4 by a direct motor, the stator 16 of which is rigid will said connection element 4 and the rotor 18 of which is rigid with said first half-head 2.
  • the second half-head 6 and the first half-head 2 are coupled together on a flat surface, the representation of which in the plane of the drawing is indicated by the line 20. This surface forms an angle of 35° with the first axis 10.
  • the second half-head 6 can rotate with respect to the first half-head 2 about a second axis 22, by virtue of the presence of guide bearings 24 applied to said first half-head 2 and engaging a circumferential groove 26 provided in the casing of the second half-head 6.
  • the second half-head 6 is rotated with respect to the first half-head 2 by a direct motor, the stator 28 of which is rigid with said first half-head 2 and the rotor 30 of which is rigid with said second half-head 6.
  • Both the direct motors i.e. that interposed between the connection element 4 and the first half-head 2 and that interposed between the first half- head 2 and the second half-head 6, can be either permanent magnet synchronous motors or induction motors.
  • the angular position of the first half- head 2 to the connection element 4 and the angular position of the second half-head 6 to the first half-head 2 are controlled by respective position transducers 32, 34.
  • this angle can vary from 0° to 110° and assume all intermediate values between these two end values.
  • the spindle axis can be made to assume any spatial direction within a cone having a vertex angle of 220°.
  • the double-rotatable head of the invention is particularly advantageous compared with traditional double- rotatable heads, and in particular:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Gripping On Spindles (AREA)
  • Jigs For Machine Tools (AREA)

Abstract

A double-rotatable spindle head with non-perpendicular axes for machine tools, with a first half-head (2) pivoted to the machine structure (4) about a first axis (10) and, for supporting the tool spindle (8), a second half-head (6) coupled to the first half-head (2) on a flat surface (20) and pivoted to it about a second axis (22) perpendicular to said flat surface (20), characterised in that said flat surface (20) forms with said first axis (10) an angle less than 45° and preferably between 35° and 40°.

Description

DOUBLE-ROTATABLE SPINDLE HEAD FOR MACHINE TOOLS.
This invention relates to a double-rotatable spindle head for machine tools.
Double-rotatable heads for machine tools are known for machining three-dimensional surfaces, in particular for preparing light alloy moulds and models. They generally comprise two parts or half-heads, one of which (the first half-head) is able to rotate with respect to the machine structure about an axis, the other (second half-head) being able to rotate with respect to the first about a second axis at an angle to the preceding. Coordinated rotation of the two half-heads, generally by electric motors via a gear transmission system, enables the tool axis to be orientated in the desired direction in space.
In a known type of double-rotatable head, the first half-head is of fork shape with its axis of rotation (first axis) perpendicular to the transverse arm thereof, and the second half-head, which supports the tool spindle, is hinged to the two parallel arms of the first half-head about an axis (second axis) parallel to the transverse arm thereof. This known type of double-rotatable head, in which rotating the second half-head with respect to the first half-head about the second axis results in movement of the tool axis in a vertical plane, with a range which can even reach + 110°, i.e. suitable for machining undercuts, presents a serious limitation related to the fork shape of the first half-head.
In effect, this shape results in a substantial bulk to the sides of the spindle and hence a difficulty in making the tool approach the surface of the workpiece, and in particular a difficulty in inserting the tool and its spindle into cavities present in said workpiece. ln another type of double-rotatable head, the first half-head is of substantially cylindrical shape with its axis coinciding with the first axis, the second half-head being positioned to the side of the first half-head, with the second axis perpendicularly cutting the first axis. In this case rotating the second half-head with respect to the first half-head about the second axis causes the tool axis to again move in a vertical plane but practically without any limitation.
By virtue of this lateral position of the second half-head with respect to the first half-head a reduction in the minimum distance between the spindle and surface of the workpiece is obtained, and hence a greater approach of the tool to said surface. However the loss of structural symmetry of the head results in a reduction in operative accuracy compared with the previous fork type.
In another known type of double-rotatable head the second half-head is coupled to the first half-head on a flat surface inclined at 45° to the first axis, the second axis being perpendicular to said flat surface.
By rotating the second half-head with respect to the first half-head about the second axis, the tool axis describes a conical surface having an angle of 90° at its vertex, and can pass in particular from the vertical position, parallel to the first axis, to the horizontal position.
This construction has proved more valid than the preceding, both with regard to the approachability of the tool to the surface of the workpiece, its penetrability into cavities present therein when required, and an accentuated reduction in the Pivot effect, which can result in a substantial reduction in the maximum machinable dimension of the workpiece for equal machine tool dimensions. However because of the limited range of the tool axis, it cannot do undercut work.
An object of the invention is to eliminate all the drawbacks jointly or separately encountered in known double-rotatable heads for machine tools, and in particular to provide a double-rotatable head which besides being able to work in close proximity to the three-dimensional surface to be machined, can also penetrate into cavities present in the workpiece and can also machine undercuts.
Another object of the invention is to provide a double-rotatable head practically without slack and friction, which generally exist in traditional heads and are the cause of positioning inaccuracies and the need for frequent adjustments for their reduction.
These and further objects are attained according to the invention though a double-rotatable spindle support head for a machine tool as described in claim 1.
A preferred embodiment of the invention is described in detail hereinafter with reference to the accompanying drawings, in which: Figure 1 is a side view of a double-rotatable head of the invention in a configuration with the tool axis parallel to the first axis; Figure 2 is a vertical section therethrough in the same configuration as Figure
1 ; Figure 3 is a side view thereof in a configuration with the tool axis at an angle of 110° to the first axis; and Figure 4 is a vertical section therethrough in the same configuration as Figure As can be seen from the figures, the double-rotatable head of the invention comprises, in traditional manner, a first half-head 2 applied to the machine tool structure (not shown) via a connection element 4, and a second half-head 6 supporting the tool spindle 8. The first half-head 2 can rotate with respect to the machine structure, and hence to the connection element 4 about a first axis 10 by virtue of the presence of guide bearings 12 applied to said connection element 4 and engaging a circumferential groove 14 provided in the casing of the first half-head 2.
The first half-head 2 is rotated with respect to the connection element 4 by a direct motor, the stator 16 of which is rigid will said connection element 4 and the rotor 18 of which is rigid with said first half-head 2.
The second half-head 6 and the first half-head 2 are coupled together on a flat surface, the representation of which in the plane of the drawing is indicated by the line 20. This surface forms an angle of 35° with the first axis 10.
The second half-head 6 can rotate with respect to the first half-head 2 about a second axis 22, by virtue of the presence of guide bearings 24 applied to said first half-head 2 and engaging a circumferential groove 26 provided in the casing of the second half-head 6. The second half-head 6 is rotated with respect to the first half-head 2 by a direct motor, the stator 28 of which is rigid with said first half-head 2 and the rotor 30 of which is rigid with said second half-head 6.
Both the direct motors, i.e. that interposed between the connection element 4 and the first half-head 2 and that interposed between the first half- head 2 and the second half-head 6, can be either permanent magnet synchronous motors or induction motors. The angular position of the first half- head 2 to the connection element 4 and the angular position of the second half-head 6 to the first half-head 2 are controlled by respective position transducers 32, 34.
In operation, while the rotation of the direct motor interposed between the connection element 4 and the first half-head 2 causes both the half-heads 6 and 2 to rotate about the first axis 10 and hence cause the tool axis to describe a conical surface, which becomes cylindrical when the two axes are parallel, rotation of the direct motor interposed between the first half-head 2 and the second half-head 6 causes this latter to rotate about the second axis 22 to hence vary the angle between the first axis 10 and the spindle axis.
More specifically, this angle can vary from 0° to 110° and assume all intermediate values between these two end values.
Consequently, by suitably controlling the two direct motors the spindle axis can be made to assume any spatial direction within a cone having a vertex angle of 220°.
From the aforegoing it is apparent that the double-rotatable head of the invention is particularly advantageous compared with traditional double- rotatable heads, and in particular:
- it enables the tool to be positioned in strict proximity to the surface of the workpiece,
- it ensures good penetrability of the tool and its spindle into any cavities in the workpiece,
- it enables undercuts to be machined,
- it practically eliminates slack and friction between parts in mutual movement, to obtain high precision in positioning the tool with respect to the workpiece, without the need for frequent adjustments.

Claims

C L A I M S
1. A double-rotatable spindle head with non-perpendicular axes for machine tools, with a first half-head (2) pivoted to the machine structure (4) about a first axis (10) and, for supporting the tool spindle (8), a second half- head (6) coupled to the first half-head (2) on a flat surface (20) and pivoted to it about a second axis (22) perpendicular to said flat surface (20), characterised in that said flat surface (20) forms with said first axis (10) an angle less than 45° and preferably between 35° and 40°.
2. A double-rotatable head as claimed in claim 1 , characterised in that the first half-head (2) comprises a circumferential guide groove (14) engaged by guide bearings (12) applied to said machine structure (4).
3. A double-rotatable head as claimed in claim 1 , characterised in that the second half-head (6) comprises a circumferential guide groove (26) engaged by guide bearings (24) applied to said first half-head (2).
4. A double-rotatable head as claimed in claim 1 , characterised by comprising a direct motor (16, 18) for rotating said first half-head (2) with respect to said machine structure (4).
5. A double-rotatable head as claimed in claim 1 , characterised by comprising a direct motor (28, 30) for rotating said second half-head (6) with respect to said first half-head (2).
6. A double-rotatable head as claimed in claim 1 , characterised by comprising a transducer (32) for controlling the angular position of the first half-head (2) with respect to the machine structure (4).
7. A double-rotatable head as claimed in claim 1 , characterised by comprising a transducer (34) for controlling the angular position of the second half-head (6) with respect to the first half-head (2).
PCT/EP2001/011063 2000-09-25 2001-09-25 Double-rotatable spindle head for machine tools WO2002024401A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002214991A AU2002214991A1 (en) 2000-09-25 2001-09-25 Double-rotatable spindle head for machine tools

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE20000020 ITVE20000020U1 (en) 2000-09-25 2000-09-25 BIROTATIVE HEAD SPINDLE HOLDER FOR MACHINE TOOL
ITVE00U000020 2000-09-25

Publications (1)

Publication Number Publication Date
WO2002024401A1 true WO2002024401A1 (en) 2002-03-28

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IT (1) ITVE20000020U1 (en)
WO (1) WO2002024401A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005108007A1 (en) * 2004-05-10 2005-11-17 Hpt Sinergy S.R.L. Machine tool with a mono-rotatable spindle head and mono-rotatable workholding table
GB2446490A (en) * 2007-02-09 2008-08-13 Tecniche Ind Srl Operating head for automatic machine tools
DE102012221926A1 (en) 2011-12-02 2013-06-06 Breton S.P.A. Working head for machine tool used for processing metal, has connection portion which is provided for connecting spindle with specific carrier element at two different angular configurations
ES2546637R1 (en) * 2014-03-24 2015-11-16 Zayer, S.A. TOOL MACHINE HEAD
DE102008007293B4 (en) * 2007-02-09 2019-08-14 Breton S.P.A. Automatic machine tool clamping head with second axis rotation inclined 45 ° relative to the first axis, and with a mechanical spindle unit interchangeable with a high speed motor spindle unit
EP3593940A1 (en) 2018-07-09 2020-01-15 Reiden Technik AG Machine tool
DE102019120681A1 (en) * 2019-07-31 2021-02-04 Gebr. Heller Maschinenfabrik Gmbh Machine tool
IT202100020099A1 (en) * 2021-07-28 2023-01-28 Hpt Sinergy Srl WORK HEAD FOR A MACHINE TOOL WITH INTERCHANGEABLE ELECTRIC SPINDLE

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1552649A1 (en) * 1966-12-17 1969-11-06 Oerlikon Elektrodenfabrik Eise Device for setting the spatial position of a workpiece in its desired machining position
US3823644A (en) * 1973-01-30 1974-07-16 Colt Ind Operating Corp Swivel head assembly for five axis machine tool
US4478540A (en) * 1981-06-19 1984-10-23 Centre D'etudes Du Fraisage Spindle head assembly with oblique axis of rotation
EP0513716A2 (en) * 1991-05-13 1992-11-19 DÖRRIES SCHARMANN GmbH Numerically controlled machine tool with horizontal-vertical spindle nose
US5413439A (en) * 1994-03-18 1995-05-09 Industrial Technology Research Institute Universal spindle head for machine tool
EP0701880A1 (en) * 1994-09-16 1996-03-20 SASIB S.p.A. Manipulating device for handling in particular for orientating workpieces, tools or the like
US5584621A (en) * 1995-06-13 1996-12-17 Bertsche Engineering Corp. Direct drive multiple axes rotary spindle head for milling machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1552649A1 (en) * 1966-12-17 1969-11-06 Oerlikon Elektrodenfabrik Eise Device for setting the spatial position of a workpiece in its desired machining position
US3823644A (en) * 1973-01-30 1974-07-16 Colt Ind Operating Corp Swivel head assembly for five axis machine tool
US4478540A (en) * 1981-06-19 1984-10-23 Centre D'etudes Du Fraisage Spindle head assembly with oblique axis of rotation
EP0513716A2 (en) * 1991-05-13 1992-11-19 DÖRRIES SCHARMANN GmbH Numerically controlled machine tool with horizontal-vertical spindle nose
US5413439A (en) * 1994-03-18 1995-05-09 Industrial Technology Research Institute Universal spindle head for machine tool
EP0701880A1 (en) * 1994-09-16 1996-03-20 SASIB S.p.A. Manipulating device for handling in particular for orientating workpieces, tools or the like
US5584621A (en) * 1995-06-13 1996-12-17 Bertsche Engineering Corp. Direct drive multiple axes rotary spindle head for milling machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005108007A1 (en) * 2004-05-10 2005-11-17 Hpt Sinergy S.R.L. Machine tool with a mono-rotatable spindle head and mono-rotatable workholding table
GB2446490A (en) * 2007-02-09 2008-08-13 Tecniche Ind Srl Operating head for automatic machine tools
ES2335843A1 (en) * 2007-02-09 2010-04-05 Tecniche Industriali, S.R.L. Operating head for automatic machine tools
DE102008007293B4 (en) * 2007-02-09 2019-08-14 Breton S.P.A. Automatic machine tool clamping head with second axis rotation inclined 45 ° relative to the first axis, and with a mechanical spindle unit interchangeable with a high speed motor spindle unit
DE102012221926A1 (en) 2011-12-02 2013-06-06 Breton S.P.A. Working head for machine tool used for processing metal, has connection portion which is provided for connecting spindle with specific carrier element at two different angular configurations
ES2546637R1 (en) * 2014-03-24 2015-11-16 Zayer, S.A. TOOL MACHINE HEAD
EP3593940A1 (en) 2018-07-09 2020-01-15 Reiden Technik AG Machine tool
DE102019120681A1 (en) * 2019-07-31 2021-02-04 Gebr. Heller Maschinenfabrik Gmbh Machine tool
DE102019120681B4 (en) 2019-07-31 2024-04-25 Gebr. Heller Maschinenfabrik Gmbh Machine tool
IT202100020099A1 (en) * 2021-07-28 2023-01-28 Hpt Sinergy Srl WORK HEAD FOR A MACHINE TOOL WITH INTERCHANGEABLE ELECTRIC SPINDLE
WO2023007388A1 (en) * 2021-07-28 2023-02-02 Hpt Sinergy S.R.L. Working head for a machine tool having an interchangeable electrospindle

Also Published As

Publication number Publication date
AU2002214991A1 (en) 2002-04-02
ITVE20000020U1 (en) 2002-03-25
ITVE20000020V0 (en) 2000-09-25

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