WO2011023172A1 - Procede de decoupe pour reduire un impact de decoupage - Google Patents

Procede de decoupe pour reduire un impact de decoupage Download PDF

Info

Publication number
WO2011023172A1
WO2011023172A1 PCT/DE2010/000994 DE2010000994W WO2011023172A1 WO 2011023172 A1 WO2011023172 A1 WO 2011023172A1 DE 2010000994 W DE2010000994 W DE 2010000994W WO 2011023172 A1 WO2011023172 A1 WO 2011023172A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
tool
beginning
linear motor
oscillation
Prior art date
Application number
PCT/DE2010/000994
Other languages
German (de)
English (en)
Inventor
Olaf Marthiens
Original Assignee
Gottfried Wilhelm Leibniz Universität Hannover
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
Priority claimed from DE102009038715A external-priority patent/DE102009038715A1/de
Application filed by Gottfried Wilhelm Leibniz Universität Hannover filed Critical Gottfried Wilhelm Leibniz Universität Hannover
Publication of WO2011023172A1 publication Critical patent/WO2011023172A1/fr

Links

Classifications

    • 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
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D2007/0012—Details, accessories or auxiliary or special operations not otherwise provided for
    • B26D2007/0043—Details, accessories or auxiliary or special operations not otherwise provided for the cutting machine comprising a linear motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/08—Means for actuating the cutting member to effect the cut
    • B26D5/14—Crank and pin means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/182—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to stators axially facing the rotor, i.e. with axial or conical air gap
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates to a cutting method for reducing a cutting stroke of a cutting machine having a cutting tool.
  • the invention relates to a cutting machine with a crank drive.
  • Cutting methods such as shear cutting or sheet punching, are typically performed with a cutting machine having a two-part cutting tool, namely an upper tool and a lower tool.
  • the upper tool is moved by a drive with a lifting movement and leads to a movement on the lower tool from.
  • the force exerted by the upper tool on the workpiece increases, that is, the cutting machine springs up, until the material of the workpiece abruptly fails along a cutting line and the cut is performed.
  • the invention solves the problem by a cutting impact damping device according to claim 8.
  • An advantage of the main invention is that already then the oscillation of the cutting tool counteracting restoring force can be applied to the cutting tool, for example, when the upper tool and the lower tool relative to each other substantially not yet move.
  • the cutting machine is spring-loaded.
  • the upper tool is greatly accelerated toward the lower tool.
  • the relative speed between upper and lower tool is still very low. The acceleration, however, considerable.
  • the damping force depends on a relative speed between the upper and lower tools or on a reivativ position of the upper and lower tool relative to each other. From the motion characteristic of the upper tool relative to the lower tool, it follows that initially the acceleration assumes a large value and only then does the relative speed.
  • the method according to the invention can therefore significantly better damp the oscillation of the cutting tool triggered by the cutting impact, in particular the oscillation of an upper tool into a lower tool, than methods according to the prior art. It is also advantageous that the damping of the oscillation triggered by the cutting impact is achieved without rubbing against one another and thus rapidly wearing parts. It is another advantage that the damping of cutting stroke can be quickly adapted to changing boundary conditions. If, for example, the mass of the upper tool or the material of sheet metal to be cut changes, it is sufficient to adapt the time profile of the energization of the linear motor in order to again obtain the optimum damping.
  • a cutting tool is understood in particular as a two-part or multi-part cutting tool which comprises an upper tool and a lower tool.
  • Under the Bestromungsmuster is understood in particular a sequence of electrical currents or voltages, with which the linear motor is acted upon.
  • the Bestromungsmuster is stored for example in a digital memory of the electrical control. The individual currents or voltages usually follow one another directly and thus without any idle time.
  • any desired time after the beginning of the cutting stroke can be selected as the end time. It is favorable, however, to choose such a time at which the oscillation of the cutting tool has subsided substantially.
  • the evaluation value which can also be referred to as a fitness value
  • any value is understood, which increases as the oscillation increases.
  • such an evaluation value is used, which is characterized in that it is small when the wear of the cutting tool is low and is large when the wear is large.
  • an evaluation value that positively correlates with the wear is used.
  • the evaluation value can be determined, for example, by the root mean square value from the oscillation profile of the oscillation.
  • the step of changing the flow pattern is understood in particular to mean that at least one of the current or voltage values is changed.
  • the current pattern is changed increasingly smaller with increasing number of changes in the rule.
  • the degree of change is proportional to the valuation value and inversely proportional to the number of changes, so that after a large number of changes, the optimization of the valuation pattern is almost complete.
  • the decisive change in the current flow pattern occurs at the beginning of the optimization.
  • a fast-changing rating value delays the end of the optimization, but can also restart the near-completion optimization. If the evaluation value is ideally zero, then there is no oscillation and a change in the current pattern does not take place.
  • the excitation pattern is optimized in the context of a genetic or evolutionary optimization algorithm such that the evaluation value decreases and at best becomes minimal. In this way, the oscillation of the cutting tool is minimized without having to know in advance which physical relationships influence the oscillation.
  • the evaluation value may, for example, be the root of the sum of squares of the oscillation values, the sum of the squares of the oscillation values, the sum of the absolute values or a sum of higher integer exponents of the oscillation values.
  • the root of the sum of squares of the oscillation values has proved particularly suitable.
  • the oscillation is recorded at more times than the energization pattern has entries. If, for example, the energization pattern comprises one-hundredth consecutive currents or voltages, then the oscillation should be recorded at least at one hundred points in time. Usually will the number of measuring points of the measured oscillation be significantly greater than the number of currents or voltages in the current flow pattern.
  • the starting time is before the respective cutting stroke beginning.
  • the linear motor can already be energized before the cutting tool comes into engagement with the metal sheet.
  • the oscillation of the cutting tool can be attenuated particularly effective after cutting start.
  • the energization pattern preferably corresponds to a quantity of temporally equidistant current or voltage values.
  • the linear motor is acted upon at the respective time with the corresponding current or the corresponding voltage.
  • Particularly suitable are current patterns with at least 50 current or voltage values have been found. Also favorable are energization patterns with at most one hundred current or voltage values.
  • the end time corresponds to the time at which the upper tool comes out of engagement with the sheet. After this time oscillations of the cutting tool for wear no longer matter. It is particularly favorable if a lead time period between the start time and the start of cutting is at least one quarter of a damping period between the beginning of cutting and the end time. It has been shown that such a particularly efficient damping is possible.
  • the oscillation with the optimized current application pattern is intensified by the cutting impact in such a way that, ideally, with the inferferential cutting impact oscillation after the cutting stroke, no resulting oscillation occurs any more. occurs.
  • the remaining oscillation, while the cutting punch is engaged with the sheet is damped by the subsequent flow pattern.
  • the method according to the invention comprises the steps of detecting a cutting tool position along a stroke path of the cutting tool, energizing the at least one linear motor so that the cutting tool applies a biasing force against a workpiece to be cut, before the cutting stroke beginning and releasing the biasing force immediately after the start of cutting. This ensures that the force necessary for cutting the workpiece is applied to a certain extent by the linear motor.
  • the cutting machine springs less, and the cutting stroke can be damped even faster.
  • the method according to the invention particularly preferably comprises the step of applying the cutting force to the cutting tool after releasing the biasing force.
  • the beginning of the cutting stroke can be detected particularly precisely if the detection of the beginning of the cutting stroke involves detecting an acceleration of the cutting tool, in particular of an upper tool.
  • the acceleration is large immediately after the beginning of the cutting stroke, but the relative speed between the upper tool and the lower tool is low.
  • a high acceleration is therefore a clear and easily measurable indication of the beginning of cutting stroke.
  • the linear motor is energized so that it always applies a restoring force on the cutting tool or a part of the cutting tool, such as the upper tool or the lower tool, which is temporally variable and a phase shift relative to the time-varying vibration of the cutting tool, or of the upper tool relative to the lower tool has.
  • the phase shift is substantially at 180 °. This means that it is possible, but not necessary, for the phase shift to lie within the control accuracy at 180 °. For example, it is sufficient if the phase shift is between 170 ° and 190 °.
  • the cutting impact may occur at different points along a cutting line at different times. This results in a slight tilting of the cutting tool or of the upper tool relative to the lower tool. This results in an oscillation of the cutting tool or an upper and / or lower tool about a pivot axis, which also leads to wear.
  • This oscillation is avoided if the detection of the cutting start of impact and the energizing of the at least one linear motor is carried out at two, in particular at four points, wherein the at least two points are arranged in particular at corners of the cutting tool.
  • the restoring force also sets earlier, at a point where the cutting stroke used to be earlier, so that the oscillations around the pivot axis are significantly reduced.
  • the method comprises the steps of detecting an angular position of the cutting tool and energizing the at least one linear motor so that the angular position of the cutting tool approaches a desired angular position.
  • the desired angular position causes a part of the cutting tool to touch the workpiece earlier than other parts of the cutting tool.
  • the desired angular position is selected so that the cutting stroke along the cutting line substantially to same time occurs.
  • the angular position is understood in particular to mean the orientation of the cutting tool relative to a plane in which the workpiece and / or the lower tool is arranged.
  • a cutting impact damping device according to the invention preferably has a double-comb linear motor.
  • a double-comb linear motor is understood in particular to mean a linear motor in which two oppositely arranged partial primary parts surround a secondary part having permanent magnets. Double comb linear motors are short in construction and therefore well suited for short-stroke cutting machines.
  • both primary parts share all permanent magnets.
  • each north pole of a permanent magnet interacts with one of the partial primary parts, whereas the south pole of the same permanent magnet interacts with the other primary partial part.
  • An advantage of this is the particularly compact design.
  • the secondary part has a matrix of fiber-reinforced plastic, in which the permanent magnets are embedded. Fiber-reinforced plastic has a high strength and keeps the permanent magnets safely in place. At the same time the plastic is electrically non-conductive, so that no eddy currents are induced, which could affect the dynamics of the linear motor.
  • a particularly durable and at the same time robust guidance is obtained when the secondary part has on both sides a guide rail, by means of which the secondary part is guided centrally between the two partial primary parts.
  • the secondary part is guided by a guide carriage on the two partial primary parts.
  • the attractive forces of the primary parts to zero, so that the attractive forces that are exerted by the two sub-primary parts respectively on the secondary part, are completely absorbed via a compound of the two sub-primary parts. Since, consequently, no forces acting perpendicularly on the partial primary parts have to be absorbed at the secondary part, the guidance of the secondary part is particularly wear-resistant.
  • a particularly good magnetic closure and at the same time a magnetic shielding are obtained when the guiding machine is ferromagnetic.
  • a distance measuring sensor in particular a magnetic distance measuring sensor, is arranged for measuring a position of the secondary part relative to the primary part.
  • the magnetic displacement sensor delivers reliable measured values since the ferromagnetic guide rail effects a magnetic closure, so that only a weak stray magnetic field exists outside the guide rail.
  • a particularly dynamic linear motor is obtained when the secondary part has a plurality of teeth and has a toothed head winding with an open groove.
  • a magnet pitch of the permanent magnets essentially corresponds to 6/7 of the pole pitch of the teeth of the secondary part. In this way, a particularly large force can be applied to the cutting tool.
  • FIG. 1 shows a schematic perspective view of a cutting machine according to the invention
  • FIG. 2 shows a perspective view of a cutting impact damping device according to the invention, which is connected to a table and a plunger of a cutting machine according to the invention
  • Figure 3 shows a schematic cross section through the inventive
  • FIG. 4 shows a laminated core of a primary part of a linear motor of the sectional impact damping device according to FIG. 2, the laminated core being shown without coils,
  • FIG. 5 shows the laminated core according to FIG. 4 with coils
  • FIG. 6 shows a perspective view of the cutting impact damping device according to FIG. 2,
  • FIG. 7 shows an exploded view of the cutting impact damping device according to FIG. 6,
  • FIG. 8 shows a schematic diagram of the cutting impact damping device according to the invention
  • FIG. 9a a representation of a path of the ram once with and once without cutting stroke
  • FIG. 9b shows an oscillation of the plunger relative to its ideal curve due to the cutting stroke
  • FIG. 10 shows a current application pattern
  • FIG. 11 shows a pattern of random voltages with the aid of which a further current application pattern is calculated from the standard energization pattern.
  • FIG 1 shows a cutting machine 10 according to the invention comprising a frame 12 and a drive 14 which moves a plunger 16 with a lifting movement up and down.
  • the drive 14 may be any drive and in the present case comprises a crankshaft 18, a flywheel 20 and an electric motor 22 for driving the crankshaft 18.
  • the frame 12 includes a table 24, in which a lower tool 26 is inserted.
  • the lower tool 26 and the upper tool 28 are part of a cutting tool 30.
  • the upper tool 28 has a punch 32 which has a smaller outer diameter by a small amount, as an inner diameter of a recess 25 in the lower tool 26, the also called a template.
  • the cutting machine 10 is fed by a feed sheet, not shown, which then gets between upper tool 28 and lower tool 26 and cut out according to the shape of the punch 32. The result is the desired slug.
  • FIG. 2 shows the cutting tool 30 according to FIG. 1 and the plunger 16.
  • a cutting impact damping device 36 comprising a synchronous, double-planar linear motor 38 and a first fastening device 40 for fastening the linear motor 38 to the Plunger 16 and a second fastening device 42 for attaching the linear motor 38 to the table 24 includes.
  • the plunger 16 moves along a linear lifting path, which is indicated by the arrow P. If a metal sheet is positioned between upper and lower tool and the plunger 16 moves downwards, then the punch 32 (see FIG. 1) comes into contact with the metal sheet, which initially opposes mechanical resistance for further movement of the punch 32 downward.
  • the plunger 16 is pressed further down, so that it comes to a spring-back.
  • the springing deforms, for example, the crankshaft 18 elastically.
  • Figure 3 shows a schematic cross section through the linear motor 38.
  • the secondary part 46 has a plurality of permanent magnets 48.1, 48.2,. alternating polarities to each other.
  • the primary part 44 comprises a first sub-primary part 50.1 and a second sub-primary part 50.2, which are constructed essentially mirror-symmetrically with respect to one another and lie opposite one another with respect to a longitudinal axis L of the secondary part 46. Because of their symmetrical structure, only the partial primary part 50.1 will be described in more detail below.
  • the first part primary part 50.1 has a leafed laminated core 52.1, which has teeth 54.1 ... 54.6.
  • the first tooth 54.1 is surrounded by a coil + U.
  • the second tooth 54.2 is surrounded by a coil -U
  • the third tooth 54.3 is surrounded by a coil -V
  • the fourth tooth 54.4 is surrounded by a coil + V
  • the fifth tooth 54.5 is from a coil + W
  • the sixth tooth is surrounded by a coil -W.
  • Each of the coils thus surrounds exactly one of the teeth 54.
  • FIG. 4 shows the laminated core 52.1 without coils. It can be seen that between each two teeth a groove 56.1 ... 56.5 is formed.
  • the grooves 56 have on their sides facing the secondary part, that is, in Figure 4 on its upper side, a slot opening N, which is substantially as large as a Kehlungsbach K at the bottom of the grooves. Although this reduces the power density of the linear motor, at the same time its inductance also decreases. It is obtained a particularly fast responding linear motor, which is advantageous for the present purpose.
  • the laminated core 52.1 has peripheral teeth 54.7, 54.8, which each form a groove 56-.6 or 56.7 with the first tooth 54.1 and the sixth tooth 54.6, which correspond in their geometrical dimensions to the remaining grooves 56.1... 56.5. All grooves 56 have the same cross sections.
  • FIG. 4 shows that a longitudinal bore 58.1... 58.4 is introduced into the laminated core 52.1 centrally between the next but two grooves centrally below the groove.
  • a first longitudinal bore 58.1 is located between the first tooth 54.1 and the first marginal tooth 54.7.
  • the second longitudinal bore 58.2 is located between the second tooth and the third tooth below the groove 56.2
  • the third longitudinal bore 58.3 is located below the groove 56.4
  • the fourth longitudinal bore is disposed below the groove 56.7.
  • the laminated core 52.1 of the linear motor comprises centrally below grooves between teeth of the primary part a longitudinal bore for suppressing parasitic magnetic field lines. This ensures that the magnetic field lines of a coil hardly scatter in adjacent teeth.
  • FIG. 5 shows the laminated core 52.1 with the associated coils.
  • the coils are first wound independently of the sheet metal part 52.1 and fixed with impregnating resin. Subsequently, the coils are + U 1 -U, -V, + V, + W, -W pushed in the cured state on the associated teeth 54.1 ... 54.6 and fixed. This procedure achieves a copper fill factor of more than 50%, resulting in a high power density with low inductance.
  • a round wire with a diameter of 1 mm to 2 mm is used for winding the coils.
  • a pole coverage ratio a - describes the ratio of the magnetic bandwidth or the pole pitch b p to the pole pitch or pole width ⁇ p .
  • the pile coverage ratio is 0.80 to 0.90.
  • FIG. 6 shows the cutting impact damping device 36 in a perspective view. It can be seen that the first part primary part 50.1 and the second partial primary part 50.2 are connected on both sides via in each case one connecting element 60.1 or 60.2.
  • the secondary part 46 Centrally between the sub-primary parts 50.1, 50.2, the secondary part 46 is arranged, which has on both sides of the permanent magnet 48 each have a T-shaped guide rail 62.1, 62.2.
  • the guide rails 62.1, 62.2 have on their respective connecting element 60.1 or 60.2 sides facing a guide web 64.1 and 64.2 (not visible in Figure 6) with which they are mounted longitudinally displaceable on the respective connecting element 60.1 or 60.2.
  • forces of up to 8,000 N arise between the primary and the secondary secondary parts.
  • smaller forces can be absorbed by the guide rails 62 by a factor of 100.
  • FIG. 7 shows an exploded view of the linear motor 38. It can be seen that the permanent magnets 48.1... 48.12 are embedded in a matrix 66 of a nonconductor, namely of glass fiber reinforced plastic. Each permanent magnet has two broad sides, which are directly facing one of the two sub-primary parts 50.1 and 50.2. In other words, the two sub-primary parts 50.1, 50.2 share the permanent magnets.
  • the linear motor 38 is also referred to as a double comb linear motor.
  • screws 68.1 ... 68.4 engage through the longitudinal bores 58.1 ... 58.4 and are fastened to partial elements 70.1, 70.2 of the connecting element 60.1.
  • a displacement sensor 72 Disposed laterally outside the first guide rail 62.1 is a displacement sensor 72, which detects the x-position of the secondary part 46 relative to the primary part 44 and forwards it to a schematically drawn electrical control 46.
  • the electrical control 74 is also in contact with an acceleration sensor 76 schematically drawn in FIG. 2, which detects an acceleration of the plunger 16 and thus the upper tool.
  • the electric controller 74 is also in contact with a servo inverter 78, which as Frequency converter works and is connected via not shown electrical lines with the coils + U 1 -U, + V, -V, + W, -W in contact and these energized.
  • the servo inverter 78 has a total power of 11, 2 kW.
  • the plunger 16 (FIG. 1) is brought into a lifting movement along a repetitive lifting path. If the acceleration sensor 76 detects an acceleration a, which is oriented toward the table 24 or the lower tool 26 and exceeds a threshold value a s , the corresponding point in time is set as the cutting start point t e s.
  • the electrical control 74 controls the servo inverter 78 so that it energizes the coils + U, -U, + V, -V, + W, -W with a coil current Is t rank (t), so that a restoring force F Stud ckstei ⁇ (t) between the primary part 44 ( Figure 2) and the secondary part (46) is formed.
  • the restoring force F Studc k ste i ⁇ (t) is chosen so that it is an oscillation ⁇ x (t) of the plunger 16, ie the difference between the current position x (t) of the plunger 16 relative to its load-free stroke xiastlitis (t), counteracts.
  • the load-free lifting path xiastok (t) is the path along the x-axis, which describes the plunger 16 as a function of time, if no workpiece is machined and therefore also no cutting stroke ensteht.
  • the application time of the servo inverter 78 is 380 ⁇ s with a time frame of 200 ⁇ s.
  • a linear motor which can a maximum restoring force F R ückstei ⁇ , max of more than 2 000 N, in particular more than 3000 N, can muster.
  • the time, inside Half of this maximum restoring force is achieved, preferably less than 3 ms.
  • the regulation of the linear motor 38 takes place in real time.
  • the electric controller 74 controls the servo-inverter 78 on so that a biasing force F vorsp ann to of the
  • FIG. 8 shows a schematic view of the dimensions of the cutting impact damping device 36 according to the invention.
  • a primary part height of the partial primary parts 50.1, 50.2 is preferably less than 500 mm.
  • a width of the partial primary parts is preferably less than 200 mm. Particularly favorable is a travel of less than 150 mm and more than 50 mm.
  • FIG. 9a shows a diagram which plots the tappet travel, ie the travel of the upper tool 28, as a function of the time t on the one hand for a movement without a cutting stroke and on the other hand for a movement with a cutting stroke. It will be appreciated that when a cutting stroke occurs, the plunger movement will make a vibration around the ideal path. The difference between the movement without a cutting stroke (which can be determined, for example, by moving the upper tool without a metal sheet) and the actual movement with a cutting impact is shown in FIG. 9b.
  • FIG. 9b shows the oscillation ⁇ x (t) thus determined as a function of the time t.
  • the energizing pattern 80 (FIG. 10) is changed, for example by adding to each voltage value in the energizing pattern 80 a random voltage ⁇ U newly calculated for each value.
  • the random voltages ⁇ U are shown in FIG. 11 in a random pattern 82.
  • the result for the subsequent cut is an oscillation whose evaluation value B can be smaller or at least as large as the first evaluation value. If the second evaluation value is smaller than the first evaluation value, then the second irradiation pattern is more advantageous than the first energization pattern for suppression of the oscillation, and the second irradiation pattern is used as standard energization pattern for further cuts.
  • a respective newly generated random pattern is added to the respective standard current application pattern and accepted or rejected.
  • the energizing pattern 80 converges over time against an ideal energization pattern in which the cutting impact is attenuated particularly efficiently.
  • the larger the number n of the energizing intervals the more effectively the cutting stroke can be damped.
  • the smaller the number n of energization intervals the faster the current flow pattern converges to a particularly suitable energization pattern. It has been shown that the two contradictory demands can be reconciled particularly well if the number n ranges between 50 and 100.
  • a damping period 84 between the start of cutting impact -B e beginning and the end time t En de twice as long at most, as a lead-time 86 between the start time ts t ar t and the beginning of the cutting stroke t SSE gi nn - It should be emphasized that the evaluation value B usually tßeginn until the beginning of the cutting stroke is calculated.
  • the friction travel that the cutting tool travels relative to the metal sheet can be reduced to less than one tenth. This also reduces wear by about a tenth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Turning (AREA)

Abstract

L'invention concerne un procédé de découpe utilisé pour réduire un impact de découpage d'une machine de découpage (10) qui présente un outil de coupe (30), ledit procédé comportant les étapes suivantes : déplacer, au moyen d'un mécanisme d'entraînement comprenant une manivelle, l'un sur l'autre un outil inférieur (26)) et un outil supérieur (28) de l'outil de coupe (30) entre lesquels est disposée une tôle; détecter un début d'impact de découpage (tBeginn); après le début d'impact de découpage (tBeginn); alimenter en courant électrique au moins un moteur linéaire (38) de sorte qu'une force de rappel (F Rückstell( (+)) soit appliquée à l'outil de coupe (0), ladite force de rappel (F Rückstell (+)) agissant à l'encontre d'une oscillation (Δ x(t)) de l'outil de coupe (30) déclenchée par l'interface (comme dans DE 10 2008 011 024), le moteur linéaire (38) étant parcouru par un courant électrique entre un instant de début (t start) et un instant final (t Ende) après le début d'impact de découpage (t Beginn) selon un modèle de parcours de courant (80) qui correspond à un modèle de parcours de courant standard; après l'instant final, calculer une valeur d'évaluation (B) à partir de l'oscillation (Δ x(t)) de l'outil de coupe (30) qui constitue une grandeur pour une intensité de l'oscillation (Δ x(t)) après le début de l'impact de découpage (t Beginn); modifier le modèle de parcours de courant (80), de sorte à obtenir un second modèle de parcours de courant; effectuer une deuxième découpe; calculer une deuxième valeur d'évaluation de l'oscillation (Δ x(t)) de l'outil de coupe (30) après le début de l'impact de découpage (t Beginn) pour la deuxième étape et si la deuxième valeur d'évaluation est inférieure à la première valeur d'évaluation, établir le modèle de parcours du courant comme étant le modèle de parcours du courant standard.
PCT/DE2010/000994 2009-08-25 2010-08-25 Procede de decoupe pour reduire un impact de decoupage WO2011023172A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009038715.3 2009-08-25
DE102009038715A DE102009038715A1 (de) 2008-02-25 2009-08-25 Schneidverfahren zum Vermindern eines Schnittschlags

Publications (1)

Publication Number Publication Date
WO2011023172A1 true WO2011023172A1 (fr) 2011-03-03

Family

ID=43465257

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2010/000994 WO2011023172A1 (fr) 2009-08-25 2010-08-25 Procede de decoupe pour reduire un impact de decoupage

Country Status (1)

Country Link
WO (1) WO2011023172A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529134A1 (de) 1995-08-08 1997-02-13 Lindemann Maschfab Gmbh Einrichtung zur Dämpfung des Schnittschlages von Schrottscheren
WO1998055779A1 (fr) 1997-06-03 1998-12-10 Koninklijke Philips Electronics N.V. Amortisseur de mouvement a amplificateur electrique et dispositif de lithographie pourvu de cet amortisseur de mouvement
EP0937572A2 (fr) 1998-02-18 1999-08-25 Schuler Pressen GmbH & Co. KG Presse ou installation de pressage avec entraínement électrique selon le principe des moteurs linéaires
DE10252625A1 (de) * 2001-11-14 2003-05-28 Schuler Pressen Gmbh & Co Presse mit Schnittschlagreduzierung
DE102008011024A1 (de) 2008-02-25 2009-08-27 Gottfried Wilhelm Leibniz Universität Hannover Schneidverfahren zum Vermindern eines Schnittschlags

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19529134A1 (de) 1995-08-08 1997-02-13 Lindemann Maschfab Gmbh Einrichtung zur Dämpfung des Schnittschlages von Schrottscheren
WO1998055779A1 (fr) 1997-06-03 1998-12-10 Koninklijke Philips Electronics N.V. Amortisseur de mouvement a amplificateur electrique et dispositif de lithographie pourvu de cet amortisseur de mouvement
EP0937572A2 (fr) 1998-02-18 1999-08-25 Schuler Pressen GmbH & Co. KG Presse ou installation de pressage avec entraínement électrique selon le principe des moteurs linéaires
DE10252625A1 (de) * 2001-11-14 2003-05-28 Schuler Pressen Gmbh & Co Presse mit Schnittschlagreduzierung
DE102008011024A1 (de) 2008-02-25 2009-08-27 Gottfried Wilhelm Leibniz Universität Hannover Schneidverfahren zum Vermindern eines Schnittschlags

Similar Documents

Publication Publication Date Title
AT520088B1 (de) Verfahren zum Betreiben einer Transporteinrichtung in Form eines Langstatorlinearmotors
DE102009038715A1 (de) Schneidverfahren zum Vermindern eines Schnittschlags
EP3111454B1 (fr) Dispositif comprenant un interrupteur électrique et un actionneur électromagnétique
DE10085264B4 (de) Drahtentladungsbearbeitungsverfahren und Vorrichtung
DE112006002589T5 (de) Linearer Synchronmotor und Linearmotor-Stellglied
DE3620741A1 (de) Tischvorschubeinrichtung
DE3233606A1 (de) Digitale folgesteuerung fuer linearmotor
DE2441588C2 (de) Magnetische Positioniereinrichtung mit zwei linearen Schrittmotoren
EP3451516B1 (fr) Frein à courants de foucault à force variable doté du dispositif magnétique et du dispositif d'induction ainsi que dispositif magnétique et dispositif d'induction associés
DE4138923A1 (de) Elektronische vorrichtung zur verwaltung und steuerung des elektrischen speisungsstroms zum widerstandsschweissen, insbesondere von metallenen dosenkoerpern
EP1569805B1 (fr) Dispositif de marquage pour coder des pieces metalliques avec des codes a matrice en deux dimensions
DE2457091A1 (de) Servo-steuerschaltung
EP2238061B1 (fr) Guide-fil coulissant
DE60114219T2 (de) Vorrichtung und verfahren zur stabilisierung eines länglichen metallischen objekts aus magnetischem material
WO2011023172A1 (fr) Procede de decoupe pour reduire un impact de decoupage
DE2317323A1 (de) Linearmotor mit mehrfachsektorenanker und steuerungsvorrichtung, bei der ein solcher linearmotor verwendet wird
WO2008055863A1 (fr) Dispositif de production d'une force définie
DE10296719B4 (de) Verfahren zum Steuern einer Wickeleinrichtung
EP3353612B1 (fr) Procédé de commande d'un entraînement électrique ainsi qu'entraînement électrique
EP2005566A1 (fr) Entrainement lineaire avec unite passive mobile a masse reduite et a guidage lateral
EP1444766B1 (fr) Entrainement lineaire comprenant une unite passive mobile de masse reduite
EP1643026B1 (fr) Machine à tricoter avec un système magnétique de sélection d'aiguilles pour produire des tissus tricotés à motifs
DE2350408A1 (de) Einrichtung zur hubregelung des stoessels einer mechanischen presse
DE102009013223B4 (de) Vorrichtung und Verfahren zur Bearbeitung, insbesondere zum Stanzen eines Werkstücks, insbesondere eines Bandmaterials
EP2492027B1 (fr) Dispositif d'emboutissage d'une pièce

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10766225

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 10766225

Country of ref document: EP

Kind code of ref document: A1