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
  • B23Q39/00—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation
  • B23Q39/02—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being capable of being brought to act at a single operating station
  • B23Q39/021—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being capable of being brought to act at a single operating station with a plurality of toolheads per workholder, whereby the toolhead is a main spindle, a multispindle, a revolver or the like
  • B23Q39/022—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being capable of being brought to act at a single operating station with a plurality of toolheads per workholder, whereby the toolhead is a main spindle, a multispindle, a revolver or the like with same working direction of toolheads on same workholder
  • B23Q39/023—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation the sub-assemblies being capable of being brought to act at a single operating station with a plurality of toolheads per workholder, whereby the toolhead is a main spindle, a multispindle, a revolver or the like with same working direction of toolheads on same workholder simultaneous working of toolheads
• • 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
  • B23Q39/00—Metal-working machines incorporating a plurality of sub-assemblies, each capable of performing a metal-working operation
  • B23Q2039/002—Machines with twin spindles
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
  • Y10T29/5104—Type of machine
  • Y10T29/5109—Lathe
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/304536—Milling including means to infeed work to cutter
  • Y10T409/305544—Milling including means to infeed work to cutter with work holder
  • Y10T409/305656—Milling including means to infeed work to cutter with work holder including means to support work for rotation during operation
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T409/00—Gear cutting, milling, or planing
  • Y10T409/30—Milling
  • Y10T409/304536—Milling including means to infeed work to cutter
  • Y10T409/305544—Milling including means to infeed work to cutter with work holder
  • Y10T409/305656—Milling including means to infeed work to cutter with work holder including means to support work for rotation during operation
  • Y10T409/305824—Milling including means to infeed work to cutter with work holder including means to support work for rotation during operation with angular movement of work
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T82/00—Turning
  • Y10T82/25—Lathe
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T82/00—Turning
  • Y10T82/25—Lathe
  • Y10T82/2502—Lathe with program control
  • Y10T82/2506—And tool turret
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T82/00—Turning
  • Y10T82/25—Lathe
  • Y10T82/2552—Headstock

Definitions

• the present invention relates to the field of high speed machining of elongated parts of the type used in automobile transmission and in particular to adaptations to improve the quality and duration of such machining.
• DESCRIPTION OF THE PRIOR ART Elongated parts of the type used in automobile transmission such as a rear cross member or an engine cradle require machining operations requiring a machine tool having a tool with five axes of movement. These parts also have the specificity of presenting machinable zones essentially on their ends. Until today, the designers of manufacturing methods have developed two machining solutions to ensure the manufacture of this type of part.
• a first solution consists in having the machining required by a transfer type machine composed of a succession of machine tools respectively dedicated to one type of machining.
• This solution although rapid, has the disadvantage of being not very flexible since it requires the presence of specialized machines.
• Another solution is to have the machining required by a machine capable of working on at least five axes.
• such a solution has the disadvantage of conventionally using a machine tool having these five axes often with parallel architecture and the power of the spindle is not particularly high, thus increasing the duration of the machining.
• the duration of the machining is all the more important as the spindle of the machine tool is forced to successively machine the two ends.
• the machining precision linked to repeatability and - I - pin positioning accuracy can be> improved. .
• DE 201 18 456 ⁇ describes a machine tool, comprising s - a frame, - a horizontal guide track which defines an X axis, - two device supports or two device support sections, - two spindles with parallel horizontal axis, which are movable respectively on the device supports and independent of each other along a Y axis and a Z axis, - a transport of movable turntable on the guide track, - at at least one turntable which is pivotally arranged about a horizontal fulcrum with respect to the transport of the turntable and directs at least one fixing means for a workpiece.
• the workpiece is fixed on a machining assembly. It is in fact posed and maintained in position on a rotary table at least along a horizontal axis * The presence of this table prevents access to all of the faces of the part for the tools.
• the presence of a machining assembly further induces a greater mass and requires guiding the rotary table at its two ends.
• This document therefore does not propose a particular design of the module for setting in motion for a long part but simply a means for setting in motion a turntable on which is installed the machining assembly supporting the part. Consequently, the guide bearings in rotation about a horizontal axis each ensure the rotation of a plate, these plates being linked together by the support plate for the machining assembly. Also, the two turntables are already linked together by a connecting element other than the part.
• This type of bi-spindle machine tool conventionally has the utility of either machining a single part while eliminating the tool change times or of machining two parts simultaneously.
• German document No. DE 203 04 653 U describes a machining station comprising at least one machining unit, more particularly a tool-holder spindle for machining a part.
• the object is approached at a discharge point and there picked up by a room cart.
• the workpiece carrier moves the workpiece for machining towards the unit machining or move the object during its machining by nity 'sinage,
• the object carriage is constituted by a support plate rotating on a horizontal axis and guided in rotation at its two ends by two bearings.
• the part is supported during its machining phase by a support plate ensuring the connection between two guide bearings.
• German document DE 101 19 175 A describes a machine tool which can have two working spindles arranged horizontally suspended.
• the working spindles are mounted in spindle axes installed movable on a sliding carriage on the frame.
• the part-holding devices presented do not make it possible to envisage an effective suspension of the part. Indeed, either the piece is placed on a turntable or it is suspended by one of its ends / faces to a tray.
• the applicant has carried out research with the aim of proposing a machining solution capable of using means that remain flexible and having a high machining rate.
• the Applicant therefore sought to find an alternative to the various solutions of the prior art which each had specific drawbacks.
• This research led to the design and production of a device and a machining process involving machining means and original workpiece holding means.
• the machining device of the type of that associating a machine tool machining with a workpiece holding device equipped with an axis for setting in motion a transverse rotation relative to the diving axis.
• the workpiece holding device is constituted by a frame supporting two guide bearings in rotation along said transverse axis of rotation, the structure formed by the frame and the two bearings being closed by the workpiece whose ends are fixed to said bearings, the workpiece being a long piece of the type of that comprising surfaces to be machined concentrated at its two ends and in that the machine tool is of the type ensuring the setting in motion of two independent sliding tool holders so that the machining of the two ends of the part be realized by a different flow.
• This characteristic solves the problem of accessibility in that it avoids the presence of a transverse plate supporting the part and connecting the two bearings. This absence authorizes the tool of the machine tool with which the workpiece carrier device is associated to machine all of the faces of the long workpiece .
• the distance between the two bearings of the workpiece support device is adapted to the length of the long piece.
• the absence of a transverse plate made possible by the length of the part constitutes a particularly innovative technological choice compared to what is generally classically designed in the workpiece-holding devices which all offer, from the moment the part is not a rotating part, a support plate for the part.
• This absence of a tray in the device of the invention improves accessibility for the machining operations which must be carried out * at the ends of the parts and which are, in the assembly ⁇ proposed by the invention, the parts closest to the bearings.
• the parts of the part most subject to the constraints of machining are those which are closest to the rigid parts of the workpiece carrier device.
• the characteristic linked to the use of runners that is to say modules each classically ensuring the support and the setting in motion of an electro-spindle tool-holder solves the problem of stroke due to the length of the part and to the spacing ent of its parts to be machined.
• the characteristic consisting in using a machine tool with two runners or tool-holder spindles capable of moving both on three axes and independently of the other is particularly important in that it makes it possible to carry out asymmetrical simultaneous machining with respect to the main axes of the part.
• the combination of these two characteristics makes it possible to solve the drawbacks of the prior art by proposing a machining device capable of simultaneously carrying out most of the machining operations of the two ends and
• Another object of the invention is constituted by the method of machining a long part of the type of that having surfaces to be machined at both ends.
• this machining process is remarkable in that it consists in carrying out the machining operations requiring up to four axes of movement by means of a machine tool ensuring the setting in motion of two runners. independent tool holders so that the machining of the two ends is carried out simultaneously by a different flow then has to carry out the machining operations requiring a greater number of axes of movement by means of a special machine.
• This characteristic is particularly advantageous in that the method initially exploits a machining center capable of carrying out other machining than that intended for the type of particular parts that are long transmission parts. Thus, the manufacture of such parts can be integrated into a flexible machining line.
• the method is remarkable in that it consists in turning the part along its longitudinal axis during the machining operations in the machine tool using two independent flows.
• This characteristic makes it possible to give access to all of the machining surfaces to the tools from the same machining assembly, which the workpiece carrier devices of the prior art do not allow, the rotating support table prevents 1 * access.
• FIG. 1 is a schematic drawing of a perspective view of an embodiment of the machining device according to the invention in which a workpiece has been installed schematically
• FIG. 2 is a schematic drawing of a perspective view of a voluntarily simplified long piece to illustrate its principle of attachment to the holder device.
• the machining device referenced D as a whole includes a machine tool 100 and a holder. part 200 inside which a part 300 is represented.
• the machine tool 100 is a very high-speed machining machine tool moving in three axes X, Y and Z and independently one on the other, two runners 110 and 120 supporting the tool-holding electro-spindles not shown.
• the illustrated machine tool is of the type, which comprises a plurality of guide means corresponding to the rectilinear movements of the two runners according to three axes where the guide means consist of pairs of
• a bi-spindle machine tool is the ideal adequacy for the realization of the machining of these parts. Indeed, by implementing two runners, the two ends of. the part can be machined simultaneously without moving the part to bring it from one first flow to the other.
• the spacing of the areas to be machined constitutes, for a twin-spindle configuration; an advantage in that it is not necessary to make large strokes for each runner to reach the areas to be machined, which contributes to better precision of the machining operations carried out by each spindle.
• an original workpiece carrier device is associated with this twin-spindle machine tool 100.
• this workpiece carrier device 200 is constituted by a frame 210 supporting two guide bearings 220 and 230 in rotation according to a axis of rotation A horizontal transverse to the plunging axes Z of the two runners, the structure formed by the frame 210 and the two bearings 220 and 230 being closed by the workpiece 300.
• the closure of the structure of the device carrying the workpiece 200 by the coin 300 itself, has at least two advantages. Indeed, on the one hand it contributes to better distributing the stresses to which the device 200 is subjected during machining and on the other hand allows the absence of a movable connecting element between the two bearings 220 and 230.
• each bearing 220 and 230 comprises and guides a turntable 221 and 231 equipped with a motorized movement means, the rotation of the two plates 221 and 231 being synchronized by piloting and a means of positioning and holding in position,
• the choice of a motorization at the two ends of the part has the advantage of avoiding that one end can be offset with respect to the other whether it is in motion or in a fixed position.
• the synchronization of the motor means of each bearing guarantees optimized positioning and holding in position for the part.
• each bearing comprises a direct drive motor whose control is synchronized.
• the positioning as well as the maintenance in position of the part in the workpiece carrier device of the invention has been optimized despite the absence of a horizontal transverse workpiece carrier plate *
• the device is remarkable in that each tray motorized 231 and 221 is equipped with two supports 410, 420 and 510, 520 to receive and hold in position, the end of the part 300.
• the part 300 adopts a shape generally elongated and flattened consisting of two main faces at two opposite ends at the end of which the surfaces to be machined are concentrated. These supports are represented schematically by associations of arrows odelling the elements constituting these supports.
• each press 410, 420, 510, 520 is at the
• a 520 of the supports of one of the plates consists of a re-locked support.
• the part 300 is installed on four supports but since the support plane is defined by three points, the Applicant has advantageously imagined a fourth support 520 adapting to the position taken by the part 320 on the other three supports 410, 420, 510 avoiding any deformation of the part when holding in position.
• This adaptation takes the form of the use of a lower support 521 with an adjustable position.
• This combination of three static supports with a re-locked support guarantees good holding of the part despite the absence of a movable transverse work-holding plate.
• the frame 210 of the workpiece holding device 200 is itself mounted mobile in rotation about an axis B perpendicular to the axis of rotation A defined by the two bearings 220 and 230 that it supports .
• This characteristic provides an additional axis of movement to the part, thus increasing the range of machining operations that it is possible to carry out by means of this machining device D.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Machine Tool Units (AREA)
• Turning (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=34946805

Family Applications (1)

Country Status (5)

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Family Cites Families (4)

• 2004
  • 2004-03-29 FR FR0403259A patent/FR2867993B1/fr not_active Expired - Fee Related
• 2005
  • 2005-03-25 CN CNA2005800099590A patent/CN1938121A/zh active Pending
  • 2005-03-25 WO PCT/FR2005/050194 patent/WO2005097403A1/fr not_active Application Discontinuation
  • 2005-03-25 US US10/599,382 patent/US20070272063A1/en not_active Abandoned
  • 2005-03-25 EP EP05739396A patent/EP1740345A1/de not_active Withdrawn

Non-Patent Citations (1)

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