Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28D—WORKING STONE OR STONE-LIKE MATERIALS
  • B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
  • B28D5/04—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools
  • B28D5/045—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor by tools other than rotary type, e.g. reciprocating tools by cutting with wires or closed-loop blades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D57/00—Sawing machines or sawing devices not covered by one of the preceding groups B23D45/00 - B23D55/00
  • B23D57/003—Sawing machines or sawing devices working with saw wires, characterised only by constructional features of particular parts
  • B23D57/0053—Sawing machines or sawing devices working with saw wires, characterised only by constructional features of particular parts of drives for saw wires; of wheel mountings; of wheels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28D—WORKING STONE OR STONE-LIKE MATERIALS
  • B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
  • B28D5/0058—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material
  • B28D5/0076—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material for removing dust, e.g. by spraying liquids; for lubricating, cooling or cleaning tool or work

Definitions

• the present invention relates to the general field of cutting devices or wire sawing, and more particularly to the field of lubricating means of such devices.
• the invention finds for example applications in the industry of electronic components, ferrites, quartz and / or silicas, for example for obtaining in thin slices (called “slabs” or more generally “wafers” in English).
• materials such as crystalline silicon, used in particular for the manufacture of photovoltaic cells, sapphire or silicon carbide. It can also be used in the context of the trimming of bricks of materials such as silicon, or for the cutting of ingots bottom, for example of size G5 (840 x 840 mm bottom), size G6 (1040 x 1040 mm bottom), or more.
• the invention thus proposes a wire cutting device comprising at least one rotary member provided with means for lubricating the wire, as well as an associated wire cutting method.
• Known wire cutting devices most often comprise a wire, or more generally a sheet of wires, capable of moving in a continuous or alternating movement in abutment against a piece to be cut in one or more slices thus defining a zone of cutting.
• the cutting zone may consist of a set of cylinders placed in parallel. These cylinders called “son-guide” can be engraved with grooves defining the interval between the son of the web, in other words the thickness of the slices to be cut.
• the piece to be cut is fixed on a support table which moves perpendicularly to the wire.
• the speed of movement defines the cutting speed.
• the renewal of the wire, as well as the control of the tension are made in a part defining a wire management area, located outside the actual cutting area.
• the agent that will govern the cutting is for example an abrasive attached to the wire, or a free abrasive bubbled.
• the wire only acts as a carrier.
• the wire used even if it only acts as a carrier, undergoes some wear over time and its proper operation to achieve the cutting of the part requires a significant lubrication, usually water, which is constant on the wire.
• lubricating (or watering) nozzles The lubrication systems of wire cutting devices known in the prior art generally use lubricating (or watering) nozzles. These lubricating nozzles can be fixed or movable, and will spray a lubricating liquid on the wire during cutting.
• the positioning of the nozzles is often carried out as close as possible to the wire.
• an arrow starts to appear on the wire, for example because of its wear or a cutting part of high hardness, there is a high probability that the nozzles are cut by the wire.
• the nozzles are positioned away from the wire, there is a high probability of non-constant lubrication during cutting.
• wire cutters are usually provided with watering from above the wire on a very short section.
• watering from above the wire on a very short section.
• the object of the invention is to remedy at least partially the needs mentioned above and the drawbacks relating to the embodiments of the prior art.
• the invention thus has, according to one of its aspects, a device for cutting by wire a piece to be cut, intended to move with respect to the wire to allow cutting, comprising at least a first member rotating about a first axis of rotation and a second rotatable member about a second axis of rotation, said first and second axes of rotation being substantially parallel to each other, said at least first and second rotating members for driving wire substantially perpendicular to said first and second axes of rotation, the wire bearing against the outer surface of each of said at least first and second rotary members extending about the corresponding axis of rotation, characterized in that at least one of said at least first and second rotatable members comprises wire lubrication means configured to allow the circulation of a fluid of the fluid. brification from its center to its outer surface in contact with the wire.
• wire is meant either a single wire or a sheet of son substantially parallel to each other, the choice depending on the type of wire cutting device.
• the invention may be possible to avoid, or at least to limit, the disadvantages mentioned above related to the use of nozzles for lubricating the son of wire cutters.
• the invention may in particular allow a better lubrication of the wire of a wire cutting device, including large cutting parts.
• the wire cutting device according to the invention may further comprise one or more of the following characteristics taken separately or in any possible technical combinations.
• the lubricating liquid is advantageously water, or even polyethylene glycol (PEG).
• the lubrication means may comprise a lubricating liquid supply device, mounted on the axis of rotation of said at least one of said at least first and second rotary members, for supplying its center with lubricating liquid.
• the lubricating liquid supply device may comprise a valve for regulating the flow of lubricating liquid injected at the center of said at least one of said at least first and second rotary members.
• the presence of such a flow control valve in particular in the form of a solenoid valve, can be used to control at any time the consumption of the wire cutting device in lubricating liquid. It may thus be possible to cut the workpiece using a servo of the lubrication of the wire according to the engine torque associated with the rotary member and / or the arrow of the wire, for example.
• the presence of the flow control valve can also improve the surface condition of the cut piece by directly controlling the flow of the lubricating liquid.
• said at least one of said at least first and second rotary members may comprise a pulley provided with a groove on its outer surface to allow the positioning and driving of the wire.
• the lubricating means may be at least partly formed by at least one internal channel of the pulley for the circulation of the lubricating liquid from the center of the pulley to the outer surface of the pulley.
• Said at least one internal channel may in particular extend from the center of the pulley and open into an internal annular channel for the circulation of the lubricating liquid to the outer surface of the pulley.
• the inner annular channel may be delimited at least in part by an inner surface of the pulley, opposite to the outer surface.
• the inner surface may be pierced with a plurality of passage orifices for supplying the lubricating liquid from the inner annular channel to the groove of the pulley in contact with the wire.
• the lubricating means may also be at least partly formed by four internal channels of the pulley for the circulation of the lubricating liquid from the center of the pulley to the outer surface of the pulley.
• the four internal channels may present, in front view, a cross shape, including four branches curved in the same direction of orientation.
• the lubricating means may be at least partly formed by an internal distribution element of the lubricating liquid from the center to the outer surface of the pulley, this internal distribution element being without movement and configured to act as a pendulum, the internal distribution element being more adapted to receive the lubricating liquid from the center of the pulley and extending partially around the axis of rotation of said at least one of said at least one first and second rotary members to define an angular portion of distribution of the lubricating liquid for circulation to the outer surface of the pulley.
• the internal distribution element may for example extend at least three quarters of a turn around the axis of rotation of the rotary member.
• the internal distribution member may be hollow so as to receive the lubricating liquid.
• the internal distribution member may include an anti-gravity system to allow it to remain stationary relative to the rest of the pulley.
• the internal distribution element can be mounted on a ball-bearing shaft.
• the pulley may comprise a rotating part delimited by the outer surface of the pulley and by an inner surface, opposite to the outer surface, and extending all around the internal distribution element, the rotating part comprising a plurality passage orifices for bringing the lubricating liquid projected by the angular portion of distribution of the internal distribution element towards the groove of the pulley in contact with the wire.
• the first rotary member may comprise first wire lubrication means configured to allow the circulation of a lubricating liquid from the center to the outer surface of the first rotary member. in contact with the wire
• the second rotary member may comprise second wire lubrication means configured to allow the circulation of a lubricating liquid from the center to the outer surface of the second rotary member in contact with the wire.
• said at least one of said at least first and second rotary members may comprise a hollow cylinder forming a "wire guide" whose outer surface is provided for allow positioning and driving of the wire.
• the hollow cylinder may in particular be supplied at its center with lubricating liquid, and the lubricating means may be at least partly formed by a plurality of passage orifices pierced in the wall of the hollow cylinder to allow the circulation of the lubricating liquid from the center to the outer surface of the hollow cylinder.
• the hollow cylinder may in particular be supplied at its center with lubricating liquid, and the lubricating means may be at least partly formed by a plurality of distribution slots, made in the wall of the hollow cylinder along its length, the distribution slots for the circulation of the lubricating liquid from the center to the outer surface of the hollow cylinder.
• the hollow cylinder may further comprise a closure flange at at least one of its ends, comprising a border formed by a plurality projecting elements for engaging in the distribution slots between longitudinal portions of the wall of the hollow cylinder so as to allow accumulation of the lubricating liquid in the distribution slots.
• the device may also comprise first, second, third and fourth rotary members respectively around first, second, third and fourth axes of rotation, the axes of rotation being substantially parallel to each other.
• the rotary members for driving the wire substantially perpendicular to the axes of rotation, the wire bearing against the outer surface of each of the rotary members extending around the corresponding axis of rotation, the first, second, third and fourth rotary members respectively comprising first, second, third and fourth thread lubrication means configured to allow the circulation of the lubricating liquid from their center to their outer surface in contact with the wire.
• the invention further relates, in another of its aspects, to a method of cutting by wire of a workpiece, characterized in that it is implemented by means of a cutting device by wire as defined above, and in that it comprises the step of lubricating the wire through the lubricating means of at least one rotary member.
• the method may particularly comprise the step of adapting the value of operating parameters of the wire cutter according to the advance of the wire inside the workpiece during cutting.
• Such parameters may, for example, preferably comprise the speed of rotation and the torque of the motor driving the device for supplying the lubricating liquid to the rotary member, the deflection of the cutting wire, or even the flow rate of the lubricating liquid, the position of the wire throughout the cut, measured for example by means of a detection sensor, or the speed of movement of the cutting device relative to the support on which the workpiece is placed.
• wire cutter and the method according to the invention may comprise any of the features set forth in the description, taken singly or in any technically possible combination with other features.
• FIG. 1 represents, in a partial perspective view, a first example of a wire cutting device according to the invention
• FIG. 2 is an exploded perspective view of a rotary member of the wire cutting device of FIG. 1;
• FIG. 3 represents, in front view, the pulley of the rotary member of FIG. 2,
• FIG. 4 is a view in section and in perspective of the pulley of FIG. 3,
• FIG. 5 represents, in a partial perspective view, a rotary member of a second example of a wire cutting device according to the invention
• FIG. 6 represents, in a partly exploded perspective view, a rotary member of a third example of a wire cutting device according to the invention
• FIG. 7 represents, in perspective, the flange of the rotary member of FIG. 6,
• FIG. 8 represents, in perspective, a detail of the rotary member of FIG. 6 after assembly of the flange of FIG. 7;
• FIG. 9 represents, in perspective, the third example of wire cutting device according to the invention comprising the rotary member of FIG. 6,
• FIG. 10 represents, in perspective, a rotary member of a fourth example of a wire cutting device according to the invention.
• FIG. 11 represents a partial detail of FIG. 10
• FIG. 12 represents, in perspective, a positioning configuration of a workpiece with the aid of a wire cutting device according to the invention, positioned on a support,
• FIG. 13 illustrates, in the form of a diagram, an example of implementation of the wire cutting method according to the invention.
• FIGS. 14A, 14B and 14C respectively illustrate three examples of control methods implemented in a wire cutting method according to the invention.
• FIG. 1 there is first shown a first example of device 1 for cutting wire 2 according to the invention.
• Figure 1 is a partial perspective view of the device 1
• Figure 2 is an exploded perspective view of a rotary member 5a of the device 1
• Figure 3 is a front view of the pulley 11a of the rotary member 5a
• Figure 4 is a sectional and perspective view of the pulley 11a.
• the device 1 for cutting wire 2 is used to allow the cutting of a workpiece 3, for example made of a material such as crystalline silicon, used for example for the manufacture of photovoltaic cells, as indicated above.
• the piece to be cut 3 is carried by a support 4 and moved relative to the wire 2 to allow cutting.
• the device 1 comprises a first rotary member 5a around a first axis of rotation Xa and a second rotary member 5b around a second axis of rotation Xb.
• the first 5a and second 5b rotating members respectively rotate in the same directions of rotation Ra and Rb, for example in the clockwise direction in Figure 1, so as to allow the movement of the wire 2 in the direction D.
• the first Xa and second Xb axes of rotation are also substantially parallel to each other. In this way, the first 5a and second 5b rotary members allow the drive of the wire 2 substantially perpendicular to the first Xa and second Xb axes of rotation.
• the wire 2 bears against the outer surface Sa of the first rotary member 5a and against the outer surface Sb of the second rotary member 5b, the outer surface Sa extending around the first axis of rotation Xa , and the outer surface Sb extending around the second axis of rotation Xb.
• the first 5a and a second 5b rotary members respectively comprise lubrication means 6a and 6b of the wire 2 which are configured to allow the circulation of a lubricating liquid F, in particular water or polyethylene glycol (PEG), from their center Ca or Cb to their outer surface Sa or Sb in contact with the wire 2.
• a lubricating liquid F in particular water or polyethylene glycol (PEG)
• PEG polyethylene glycol
• the water or PEG lubrication of the wire 2 is clearly facilitated and improved, thus increasing the life of the wire 2 and the efficiency of the cutting of the part 3.
• the lubrication means 6a of the rotary member 5a are described more precisely.
• the lubrication means 6a thus comprise a supply device 7a, or rotary joint 7a, in lubricating liquid F, which is mounted on the axis of rotation Xa of the first rotary member 5a to supply its center Ca with lubricating liquid F .
• the rotary joint 7a is rotated by means of a motor 9a to which it is secured.
• the rotary joint 7a comprises a control valve 8a of the flow of lubricating liquid F injected at the center Ca of the first rotary member 5a, preferably in the form of a solenoid valve 8a.
• the solenoid valve 8a advantageously makes it possible at any time to control the consumption of the device 1 as a lubricating liquid F. It may thus be possible to cut the part 3 using servo-control of the lubrication of the wire 2 as a function of the engine torque associated with the engine. rotating member 5a and / or the yarn deflection 2 and / or the speed of rotation of the motor, by example.
• the presence of the solenoid valve 8a can also make it possible to improve the surface state of the cut piece 3 by directly controlling the flow rate of the lubricating liquid F.
• the first rotary member 5a comprises a pulley 11a provided with a groove 13a on its outer surface Sa to allow the positioning and driving of the wire 2.
• the lubrication of the wire 2 is thus produced directly through this pulley 11 drive, and no longer by the use of nozzles as in the prior art described above.
• the pulley 11a is made in such a way as to allow the flow of the lubricating liquid F inside thereof, from its center Ca to its outer surface Sa, as described hereinafter.
• a ball bearing housing 10a is further provided between the rotary joint
• a flange 12a is also provided to cover and close the pulley 11a so as to maintain the flow of the lubricating liquid F inside the pulley 11a.
• the lubrication means 6a are at least partly formed by several internal channels 14a of the pulley 11a for the circulation of the lubricating liquid F from the center Ca of the pulley 11a to the outer surface Sa of the pulley 11a.
• the number of internal channels 14a is equal to 4 in the example of FIG. 3. However, it may be envisaged a different number of channels, for example from 2, 3 or 8 channels.
• Each inner channel 14a extends from the center Ca of the pulley 11a and opens into an inner annular channel 15a for the circulation of the lubricating liquid F to the outer surface Sa of the pulley 11a.
• the arrows F symbolize the flow of the lubricating liquid F beyond the outer surface Sa of the pulley 11a for lubricating the wire 2.
• the four internal channels 14a also have, in front view as in FIG. 3, a cross shape comprising four branches bent in the same direction of orientation, for example the counterclockwise direction.
• This specific form of internal channels 14a can in particular allow to obtain a projection of the lubricating liquid F from the center Ca to the outer surface Sa which is at high speed.
• the inner annular channel 15a is delimited by the inner surface S'a of the pulley 11a, opposite to the outer surface Sa.
• This inner surface Has been pierced with a plurality of through holes 16a, as shown in FIG. can be seen in Figure 4, to bring the lubricating liquid F from the inner annular channel 15a to the groove 13a of the pulley 11a in contact with the wire 2.
• the references F represent the drops of lubricating liquid F escaping passage holes 16a.
• the passage holes 16a may for example be drilled on the inner surface S'a at regular intervals, for example every millimeter.
• the invention can also be applied to wire cutting devices 1 in the form of diamond wire saws for example.
• FIG. 5 thus represents, in a partial perspective view, a rotary member 5a of a second example of a wire cutting device 1 according to the invention.
• the rotary member 5a comprises a hollow cylinder 20a forming a "wire guide" whose outer surface Sa is provided to allow the positioning and driving of the wire 2.
• This hollow cylinder 20a is supplied from the inside at its center Ca by lubricating liquid F.
• the lubrication means 6a are formed by a plurality of through-holes 21a pierced in the wall 22a of the hollow cylinder 20a, and in its optional polyurethane coating, to allow the circulation of the lubricating liquid F from the center Ca to the outer surface Sa of the hollow cylinder 20a, in other words to bring the lubricating liquid F to the underside of the wire 2 and not from above, or This solution may possibly prevent silicon chips from sticking to the wire 2.
• FIGS. 6 to 9 also show a third embodiment of a wire cutting device 1 according to the invention.
• FIG. 6 is a partially exploded perspective view of a first rotary member 5a of this embodiment
• FIG. perspective the flange 24a of the rotary member 5a
• 8 shows, in perspective, a detail of the rotary member 5a after assembly of the flange 24a
• Figure 9 shows, in perspective, the device 1 of this example of embodiment comprising four rotary members 5a to 5d.
• the rotary member 5a comprises a hollow cylinder
• this hollow cylinder 20a is supplied at its center Ca by lubricating liquid F.
• the lubrication means 6a are here formed by a plurality of distribution slots 23a, made in the wall 22a of the hollow cylinder 20a along its length. the distribution slots 23a for the circulation of the lubricating liquid F from the center Ca to the outer surface Sa of the hollow cylinder 20a.
• the supply of lubricating liquid F can be made from the standard equipment of a diamond wire saw.
• the distribution slots 23a allow the accumulation of the lubricating liquid F and its projection on the sheet of threads 2 from below rather than from above. In this way, this can possibly prevent silicon chips from sticking to the wire 2.
• the hollow cylinder 20a has a closure flange 24a at both ends.
• This closure flange 24a has a border 25a formed by a plurality of projecting elements 26a, intended to engage in the distribution slots 23a between longitudinal portions 27a of the wall 22a of the hollow cylinder 20a.
• the lubricating liquid F propagates more specifically in the distribution slots 23a and under the edge 25a of the closure flange 24a, as shown in FIG. 8.
• the device 1 for wire cutting 2 according to this example is shown in its generality in FIG. 9.
• first 5a, second 5b, third 5c and fourth 5d rotary members similar to that described in FIGS. 6, 7 and 8, respectively around first Xa, second Xb, third Xc and fourth Xd axes of rotation, these axes of rotation being substantially parallel to each other.
• the rotary members 5a, 5b, 5c and 5d allow the drive of the wire 2 substantially perpendicular to the axes of rotation Xa, Xb, Xc and Xd, the wire 2 being in abutment against the outer surface Sa, Sb, Se and Sd of each rotary members 5a, 5b, 5c and 5d.
• the first 5a, second 5b, third 5c and fourth 5d rotary members respectively comprise first 6a, second 6b, third 6c and fourth 6d wire lubrication means 2, similar to those described above, so configured to allow circulation lubricating liquid F from their center Ca, Cb, Ce and Cd to their outer surface Sa, Sb, Se and Sd in contact with the wire 2.
• FIGS. 10 and 11 also show a fourth embodiment of the invention.
• FIG. 10 represents, in perspective, a first rotary member 5a of this example
• FIG. 11 represents a partial detail of FIG.
• This fourth example is based on the use of a mechanical system located inside the pulley 11a and which acts as a pendulum. This system, in particular because of its design and its center of gravity, is not in motion unlike the pulley 11a.
• the lubricating means 6a are formed by an internal distribution element 17a of the lubricating liquid F from the center Ca to the outer surface Sa of the pulley 11a, this internal distribution element 17a being thus without movement and configured to act as a pendulum.
• the internal distribution element 17a is adapted to receive the lubricating liquid F from the center Ca of the pulley 11a and extends partially around the axis of rotation Xa of the first rotary member 5a so as to define an angular portion of Angle distribution 18a has lubricating liquid F for circulation to the outer surface Sa of the pulley 11a.
• This internal distribution element 17a is for example mounted on a bearing. It may extend at least three quarters of a turn around the axis of rotation Xa of the rotary member 5a. In this way, the angle ⁇ of the angular portion of distribution 18a is for example of the order of 90 °.
• This angular distribution portion 18a defines the part of the pulley 11a which is "sprinkled" by the lubricating liquid F at the outlet of the internal distribution element 17a.
• the internal distribution member 17a can thus allow to lubricate only the portion of the wire 2 which enters the material of the part 3 for the rotary member 5a on the left, and to lubricate only the portion of the wire 2 which leaves the material of the part 3 for the rotary member 5b on the right.
• the internal distribution element 17a is preferably hollow so as to receive the lubricating fluid F. It further comprises an anti-gravity system to allow its immobility relative to the rest of the pulley 11a.
• the pulley 11a has a rotating part 19a delimited by the outer surface Sa of the pulley 11a and by an inner surface S'a, opposite to the outer surface Sa, and extending all around the internal distribution element. 17a.
• the rotating part 19a has a plurality of through-holes 16a for feeding the lubrication liquid F projected by the angular distribution portion 18a of the internal distribution element 17a towards the groove 13a of the pulley 11a in contact with the wire 2.
• Such a device 1 can also reduce the consumption of lubricating liquid F, in particular water or PEG.
• FIGS. 12, 13 and 14A to 14C will now be described with examples of implementation of the method according to the invention of cutting by wire 2 a piece to be cut 3.
• FIG. 12 represents, in perspective, a positioning configuration of the workpiece 3 by means of a wire cutter device 1 according to the invention, positioned on a support 4.
• references T1, T2 and T3 respectively represent the first upper third, the second third intermediate and the third lower third of the piece 3.
• FIG. 13 illustrates, in the form of a diagram, an example of steps for implementing a method according to the invention.
• a method may for example allow management of the operation of the device 1 by adjusting the value of operating parameters of the device 1 according to the advance of the wire 2 inside the workpiece 3 during cutting.
• the operating parameters may for example comprise: the speed of rotation Vm of the motor 9a driving the supply device 7a in lubricating liquid F of the rotary member 5a, the torque Cm of the engine 9a, the flow Db of the lubricating liquid F, the deflection of the cutting wire 2, or the moving speed Vd of the cutting device 1 with respect to the support 4 on which the workpiece 3 is placed.
• step 30 marks the starting step of the operation management method of the device 1.
• the device 1 and the support 4 are positioned relative to one another. other then, in step 32, a motor torque Cm is applied.
• step 33 we question the positioning of the wire 2 in the second third T2 of the part 3, as shown in FIG. 12.
• step 34 the question is asked about the whether the value of the engine torque Cm is greater than the predetermined limit value Lim indicated above. If this is the case, the flow Db and the speed of rotation Vm of the motor are increased at the same time in step 35. On the other hand, if the value of the engine torque Cm is lower than the predetermined limit value Lim, then decreases both the flow Db and the speed of rotation Vm of the engine during the step 36, the moving speed Vd of the cutting device 1 relative to the support 4 remaining unchanged.
• FIGS. 14A, 14B and 14C respectively illustrate three examples of control methods implemented in the wire cutting method 2 according to the invention.
• FIG. 14A a reference value on the engine torque Cm is given at 40.
• the servocontrol is then implemented between the rotation speed Vm at 41 of the engine at 42 and the engine torque Cm at 43.
• a set value on the positioning of the wire 2 is given at 44.
• the servocontrol is then implemented between the rotation speed Vm at 41 of the motor at 42 and the position of the wire 2 at 45.
• a setpoint value on the engine torque Cm is given at 40.
• the servocontrol is then implemented between the rotation speed at 41 of the motor of the cutting head at 46 and the engine torque Cm. in 43.
• the motor of the cutting head ensures the displacement of the cutting head in translation.
• the rotary members 5a, 5b, 5c and 5d have a section of circular shape.
• At least two rotary members could be asymmetrically shaped. More specifically, the periphery of the outer surface of at least two rotary members could thus have any type of non-substantially circular shape so that at least two points of the periphery are located at different distances from the axis (or from the center ) of said at least two rotating members.
• a sectional shape of said at least two rotary members could be substantially polygonal, for example rectangular, square, triangular, or more preferably substantially oval.

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• 2014
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• 2015
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  • 2015-06-22 WO PCT/EP2015/063928 patent/WO2015197523A1/fr active Application Filing
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