• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A machining machine comprising a frame in which a drive shaft of a tool is mounted to pivot about an axis of rotation and to move axially along the axis of rotation. The shaft is connected to two rotary motors namely a first motor connected to a meshing member with a splined section of the shaft for driving the rotating shaft and a second motor connected to a nut engaged on a threaded section of the shaft to axially move the shaft. The motors are connected to at least one control unit arranged to drive the motors independently of one another, and the first motor and the second motor are coaxial to each other.
    公开号:FR3018712A1
    申请号:FR1452350
    申请日:2014-03-20
    公开日:2015-09-25
    发明作者:George Moraru；Didier Frangeard
    申请人:ARTS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of machining by removal of material. The invention thus relates to a machine and, more particularly, a drilling machine or milling.
    [0002] A drilling machine generally comprises a frame in which a drive shaft of a tool is mounted to pivot about an axis of rotation and to move axially along the axis of rotation (advance or dive motion). ).
    [0003] In some embodiments, the machine comprises a single motor ensuring the motorization of the rotational movement and the advance movement of the shaft. Variable ratio transmission members, for example comprising gears or pulley / belt assemblies, make it possible to match the speed of rotation with the speed of axial displacement of the tool. These machining machines are therefore confined to torque speed and speed of advance whose reports are predefined. This may be limiting under certain machining conditions to achieve the optimum performance of the machine. In addition, for these conventional configurations, the mass to set in motion requires the use of relatively bulky engines.
    [0004] In machining machines for the workshop, the shaft is generally mounted only to pivot on a head which is mounted on the frame to slide along the dive direction. The structure of these machines is relatively complex and cumbersome. Some machine configurations of this type propose the addition of axial oscillations to a constant speed advance movement, in order to improve the evacuation of the chips by a better fragmentation.
    [0005] There are several systems, mainly based on various generation mechanisms, using special bearings, variable ratio gears on a lathe or piezoelectric actuators. Principles based on mechanical solutions are characterized by the fact that the amplitude of the oscillations is either fixed (predefined by the design) or modifiable but with difficulty, outside the machining process. Anyway, the frequency of these oscillations is, in turn, always linked by a fixed ratio to the speed of rotation (number of oscillations per revolution, fixed at the design). An object of the invention is to provide a machining machine having improved performance while remaining simple and compact.
    [0006] For this purpose, according to the invention, there is provided a machining machine comprising a frame in which a drive shaft of a tool is mounted to pivot about an axis of rotation and to move axially along the axis of rotation. 'rotation axis. The shaft is connected to two rotary motors namely a first motor connected to a meshing member with a splined section of the shaft for driving the rotating shaft and a second motor connected to a nut engaged on a threaded section of the shaft to axially move the shaft. The motors are connected to at least one control unit arranged to drive the motors independently of one another, and the first motor and the second motor are coaxial to each other. Thus, the speed of rotation and the speed of movement are adjustable independently of each other by means of each motor whose coaxial arrangement provides a relative compactness of the machine. The mechanical structure of the machine is also relatively simple. In addition, as an option in an application to a drilling machine, the control unit can be arranged to perform a vibration-assisted drilling cycle, this cycle being parameterizable (in amplitude and frequency of oscillations) in real time during the machining process or out of cycle.
    [0007] Advantageously, the first motor and the second motor are coaxial with the shaft. The size of the machine is then optimized. Other characteristics and advantages of the invention will emerge on reading the following description of particular non-limiting embodiments of the invention. Reference is made to the accompanying drawings, in which: FIG. 1 is a partial diagrammatic view, in axial section, of a machine according to a first embodiment of the invention; - Figure 2 is a view similar to Figure 1 of a machine according to a variant of the first embodiment; FIG. 3 is a view similar to FIG. 1 of a machine according to a second embodiment of the invention. With reference to the figures, the invention is here described in application to a parts machining machine 25 and here more particularly to drilling. The machine comprises a frame 1 which is only partially represented here. The frame 1 comprises, in a manner known per se, a bearing structure for resting on the ground and a table on which the workpiece is intended to be fixed for example by means of a machining assembly. A drive shaft 2 of a tool is mounted in the frame to have an end which extends in the vicinity of the table and which is provided with means for fastening the tool. These fixing means are known in themselves. The tool is for example mounted on one end of the drive shaft by a screw / nut connection. The shaft 2 is mounted to pivot about an axis of rotation 3 and to move axially along the axis of rotation 3. The shaft 2 is connected to two rotary electric motors, namely a first motor 10 for the rotational drive and a second motor 20 for axial displacement. More precisely, the motor 10 has a rotor that is rotatably connected to a coupling member 11 arranged to be slidably connected to a splined section 2.1 of the shaft 2 in order to drive the shaft in rotation. The coupling member 11 is for example an internally corrugated sleeve. The motor 20 has a rotor integral in rotation with a nut 21 engaged on a threaded section 2.2 of the shaft 2 thus forming a helical linkage for axially displacing the shaft 2 when a relative speed is imposed between the gear member. coupling 11 and the nut 21, that is to say that is rotated at different speeds the two elements. Advantageously, the tool being of at least partially helical shape, here a drill bit, the helical connection and the tool have steps of the same direction.
    [0008] The motor 10 and the motor 20 are coaxial with each other, which makes it possible to obtain a structure that is more compact than the existing configurations and to minimize the inertia, and is connected to at least one control unit, symbolized in FIG. 4, arranged to control the motors independently of one another. Referring more particularly to Figure 1 and according to the first embodiment of the invention, the shaft is arranged such that the spline section 2.1 and the threaded portion 2.2 are distinct and succeed each other along the axis of rotation. The two sections are here connected to each other by a connecting sleeve fixed to the respective adjacent ends of the splined section 2.1 and the threaded section 2.2. The stroke of the tool is therefore limited to a length equal to the distance between the coupling member 11 and the nut 21, minus the length of the connecting sleeve. The motor 10 and the motor 20 are coaxial with the shaft 2 and are traversed by it: the motor 10, and more particularly its rotor, extends around a portion of the grooved section 2.1 and the motor 20, and more particularly its rotor extends around a portion of the threaded section 2.2. The use of two independent motors makes it possible to have a machine having a smaller bulk and mass. The machine can therefore be designed to be portable or embedded on a robot arm. The control unit is arranged to control the motors 10 and 20 to adapt, preferably in real time, the axial displacement and / or the rotational movement according to the machining conditions. The control unit may be programmed to control the motors 10 and 20 so as to cause oscillation of the tool particularly along the axial direction thereof. This results in the creation of vibrations that improve the efficiency of drilling. The control unit is advantageously arranged so as to allow a real-time modification of the oscillations parameters (amplitude and frequency of the oscillations).
    [0009] More specifically, the control unit is arranged to control the axial displacement of the drive shaft according to at least one of the following modes: axial displacement at a constant speed; axial displacement with superimposed oscillations at a constant value.
    [0010] Oscillations are for example of sinusoidal or other shape, defined to promote chip fragmentation. The control unit is also arranged to determine electrical parameters of the motors and to determine machining conditions from these parameters. The determination is for example carried out by measurement or calculation. The machining conditions are for example deduced from the torque supplied by the motors from the supply current of the latter. It is therefore not necessary to use external sensors even if this is possible to increase the functionality of the machine. The control unit is furthermore arranged to determine and compare speeds of the engines: if during machining, while an advance of the tool is controlled, both engines start to rotate at the same speed, The control unit signals a breakage of the tool (because in this case, the tool can not advance).
    [0011] When the tool is mounted on one end of the drive shaft by a connection screw / nut, the control unit is arranged to control the motors during tool changes to ensure the assembly or disassembly of the 2. In the variant of Figure 2, the grooved section and the threaded portion extend at least partly over a common length of the shaft and more precisely here on the entire length of the tree 2.
    [0012] The rest of the machine is identical to what has been previously described in relation to FIG. 1. The stroke of the tool is thus limited here to the length of the shaft 2 minus the distance between the opposite ends of the member. The elements identical or similar to those previously described will bear the same numerical reference as these in the description which follows of the second embodiment with reference to FIG. 3. In this embodiment of FIG. embodiment, the motors 10 and 20 are no longer coaxial with the shaft 2 but remain coaxial with each other along an axis 30 inclined relative to the axis of rotation 2. The axis 30 is here more precisely perpendicular to the axis 2 in the particular embodiment presented.
    [0013] The rotor of the motor 10 drives an output shaft 12 driving a conical gear 13 meshing with a conical gear 14 which is integral in rotation with the coupling member 11 engaged on the splines of the shaft 2.
    [0014] The rotor of the motor 20 here has the shape of a tubular shaft 22 which extends coaxially around the output shaft 12. The rotor of the motor 10 drives a conical gear 23 meshing with a conical gear 24 which is secured to in rotation the nut 21 engaged on the thread of the shaft 2. Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims .
    [0015] In particular, the shaft may have a different structure from that described: the threaded section and the splined section may be derived from material or be reported on one another. The slide connection can be obtained by means other than those described and in particular a prismatic shaft slidably received in a housing of complementary shape formed in the coupling element. The shaft can be connected to the tool indirectly, at one or both ends.
    [0016] Only the parts of the machine concerned by the invention have been described: the machine may furthermore comprise in particular tool center lubrication means, tool change means, loading and unloading means for the workpieces to be machined. The invention is applicable to other types of machining machine than drilling machines and for example milling machines. Alternatively, the helical connection and the tool have steps in opposite directions, so as to facilitate the realization of a rapid return cycle of the tool.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONS1. A machining machine comprising a frame in which a drive shaft of a tool is mounted to pivot about an axis of rotation and to move axially along the axis of rotation, characterized in that the shaft is connected to two rotary motors namely a first motor connected to a coupling member in sliding connection with a first section of the shaft for driving the rotating shaft and a second motor connected to a nut in helical connection with a second section of the shaft for axially moving the shaft, in that the motors are connected to at least one control unit arranged to drive the motors independently of one another, and in that the first motor and the second motor are coaxial to each other.
    [0002]
    2. Machine according to claim 1, wherein the first motor and the second motor are coaxial with the shaft.
    [0003]
    3. Machine according to claim 1, wherein the first section and the second section are distinct along the axis of rotation.
    [0004]
    4. Machine according to claim 1, wherein the first section and the second section extend at least in part over a common length of the shaft.
    [0005]
    5. Machine according to claim 1, wherein the tool is mounted at one end of the shaft.
    [0006]
    6. Machine according to claim 1, wherein the control unit is arranged to control the axial displacement of the drive shaft in at least one of the following modes: axial displacement at a constant speed; axial displacement with superimposed oscillations at a constant value.
    [0007]
    7. Machine according to claim 1, wherein the tool being of at least partially helical shape, the helical connection and the tool have steps in opposite directions, so as to facilitate the realization of a fast return cycle of the 'tool.
    [0008]
    8. Machine according to claim 1, wherein the control unit is arranged to determine electrical parameters of the motors and determine machining conditions from these parameters.
    [0009]
    9. Machine according to claim 1, wherein the control unit is arranged to determine and compare engine speeds to detect a failure of the machine.
    类似技术:
    公开号 | 公开日 | 专利标题
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    FR2780129A1|1999-12-24|Variable speed belt transmission for traction engine
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    法律状态:
    2016-03-30| PLFP| Fee payment|Year of fee payment: 3 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 4 |
    2017-07-14| TP| Transmission of property|Owner name: AMVALOR, FR Effective date: 20170614 |
    2018-03-23| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-19| PLFP| Fee payment|Year of fee payment: 7 |
    2021-03-23| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1452350A|FR3018712B1|2014-03-20|2014-03-20|DRILLING TOOL WITH TWO COAXIAL ENGINES|FR1452350A| FR3018712B1|2014-03-20|2014-03-20|DRILLING TOOL WITH TWO COAXIAL ENGINES|
    JP2017500437A| JP6363787B2|2014-03-20|2015-03-20|Machine tools, especially drilling machine tools|
    ES15711198.0T| ES2685298T3|2014-03-20|2015-03-20|Machine tool|
    PL15711198T| PL3119556T3|2014-03-20|2015-03-20|Machine tool|
    CN201580023529.8A| CN107073667B|2014-03-20|2015-03-20|Machine tool for drilling|
    CA2943259A| CA2943259C|2014-03-20|2015-03-20|Machine tool, in particular for drilling|
    US15/126,864| US11219977B2|2014-03-20|2015-03-20|Machine tool, in particular for drilling|
    PCT/EP2015/056021| WO2015140334A1|2014-03-20|2015-03-20|Machine tool, in particular for drilling|
    PT15711198T| PT3119556T|2014-03-20|2015-03-20|Machine tool|
    EP15711198.0A| EP3119556B1|2014-03-20|2015-03-20|Machine tool|
    US16/819,663| US20200215652A1|2014-03-20|2020-03-16|Machine tool, in particular for drilling|
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