CN105195843B - Electrode wire reciprocating progressive type wire winding method and device for WEDM (wire cut electrical discharge machining) - Google Patents
Electrode wire reciprocating progressive type wire winding method and device for WEDM (wire cut electrical discharge machining) Download PDFInfo
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- CN105195843B CN105195843B CN201510566991.4A CN201510566991A CN105195843B CN 105195843 B CN105195843 B CN 105195843B CN 201510566991 A CN201510566991 A CN 201510566991A CN 105195843 B CN105195843 B CN 105195843B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
- B23H7/30—Moving electrode in the feed direction
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Abstract
The invention provides an electrode wire reciprocating progressive type wire winding method and device for WEDM (wire cut electrical discharge machining). The method and the device are characterized in that an electrode wire is controlled to perform continuous reciprocating motion, the advancing length is slightly larger than the retreating length each time, and by means of unequivalence of reciprocating wire winding, electrode wire loss is offset through whole micro propulsion of the electrode wire. The device is realized by adopting a double-wire-cylinder structure. A certain number (such as 1 mm) of new wires are always supplemented in each loop, so that the electrode wire loss is offset by the newly supplemented electrode wires (such as 1 mm) each time, the electrode wire loss in a machining process can be reduced, particularly, the effect is more obvious when a workpiece with high thickness and large cutting area is cut, and accordingly, the machining precision is improved; when a wire breaking phenomenon happens, the electrode wire can be subjected to void-cut to a wire breaking point along cutting joints with consistent width or performs in-situ wire penetration at the wire breaking point, and the machining efficiency is greatly improved.
Description
Technical field
The present invention relates to a kind of to-and-fro thread feed electric spark line cutting technology, specifically a kind of Wire EDM electrode
The reciprocal gradual wire-walking method of silk and device.
Background technology
High speed to-and-fro thread feed electric spark wire cutting (HSWEDM) is that China has the wire electric discharge for being completely independent intellectual property
Cutting processing equipment, because it has very high cost performance, has been widely used in precision component and mould processing and other fields.Mesh
Front high speed to-and-fro thread feed electric spark wire-electrode cutting machine adopts to-and-fro thread mode, and this wire mode silk cylinder Top electrode silk can be anti-
Use again, operating cost is low, but thus there is also following defect：
（1）The silk cylinder wrapping wire method for adopting at present, the length for generally once going up silk is 200-300m, due to this segment electrode
Silk certainly exists electronic wire loss always in reciprocal electric discharge cutting, and 100,000 mm are generally often cut at present2, wire electrode diameter
Loss 0.01mm, therefore when large area is cut, the width of initial joint-cutting and final joint-cutting will be caused due to the loss of wire electrode
Difference, on cutting accuracy impact is produced.
（2）Once there is fracture of wire phenomenon in large area cutting process, because wire electrode has had from starting at fracture of wire
Loss, so if now using return it is former play cutpoint, change the method that molybdenum filament is cut again again, will cut because of from
Point to the width of slit of fracture of wire point becomes narrow gradually, and affects the wire electrode feed speed of cutpoint to fracture of wire point from, that is to say, that
Now cutpoint is not cut-in without ball to fracture of wire point from, but needs to cut again and could arrive fracture of wire point, thus can be prolonged significantly
Length total clipping time.
（3）There is screws loosing at single side in traditional HSWEDM, that is, at two of silk cylinder, exist during wire
The tight problem of pine one of wire electrode one, although the constant tension device for adopting at present（Such as mechanical Weight type tension mechanism, mechanical elastic
Spring formula tension mechanism etc.）The problem can partly be alleviated, but while can also increase the probability of fracture of wire.
The content of the invention
The purpose of the present invention is for current high speed to-and-fro thread feed electric spark wire cutting（HSWEDM）Lathe is big thick in cutting
Wire electrode produces loss and then affects machining accuracy when degree, big cutting area workpiece, and occurs to be returned during fracture of wire in cutting process
Silk cutting can be unable to cut-in without ball and delay and return to fracture of wire point and extend process time because joint-cutting narrow on Aligning control, and at present wire
The screws loosing at single side problem of system generally existing, invents a kind of reciprocal gradual wire-walking method of Wire EDM wire electrode and dress
Put, it causes wire electrode on the one hand to complete the motion of high speed to-and-fro thread by mariages cylinder, while by the not reciprocity of to-and-fro thread
Property so that wire electrode integrally micro propulsion, to offset the loss of wire electrode, so that in whole cutting process, wire electrode
Loss offset by being incrementally advancing for overall electrode silk, ensure large area cutting in, the wire electrode diameter base in joint-cutting
This is constant, so as to ensure that machining accuracy will not be lost because of the loss of wire electrode, and the electrode when fracture of wire situation occurs
Silk can switch to fracture of wire point or wear silk in fracture of wire point original place along the consistent joint-cutting Quick air of width.Additionally, mariages barrel structure is ensured
The tension force of machining area wire electrode is in steady state.
One of technical scheme is：
A kind of reciprocal gradual wire-walking method of Wire EDM wire electrode, is characterized in that it is comprised the following steps：
First, two silk cylinders are set, while one of them is as wire drawing tube, another puts silk as with damping
Cylinder；
Secondly, under controlling organization control, rotate forward a silk cylinder（Clockwise）As wire drawing tube, another cylinder conduct
Put silk cylinder and produce resistance, make the wire electrode between two silk cylinders form required tension force, set when putting silk cylinder forward rotating movements and reaching
After fixed wire electrode length, original silk cylinder for rotating forward stops operating, and the silk cylinder for originally putting silk is inverted under the drive of motor
（Counterclockwise）Silk is received, and the silk cylinder for originally rotating forward also produces corresponding resistance when putting thread, makes wire electrode produce adverse movement institute
The tension force for needing, so repeats, and the wire electrode length of each forward rotating movements of coordination electrode silk is more than reversion wire electrode motion every time
Length, by back and forth not to equal length so that wire electrode integrally micro propulsion, to offset the loss of wire electrode.
Every time the difference of the length of wire electrode forward rotating movements and the length of wire electrode return motion can be entered according to processing situation
Row is adjusted, and difference range is 0.001-1 rice.
The length of described wire electrode is 1000-20000 rice.
Using mariages cylinder mechanism, each cylinder can multi-laminate silk, silk cylinder is respectively provided on two sides with bossing so as to protect
The wire electrode on card upper strata is not fall off；Main shaft is connected by shaft coupling with servomotor, and servomotor is controlled by controller and letter
The turn signal of the silk cylinder of number harvester collection；The distance that controller control silk cylinder is rotated forward is more than counter-rotational distance,
So as to pass through the not equity of to-and-fro thread, the micro propulsion of wire electrode is realized, to offset the loss of wire electrode.
When a silk cylinder in two described silk cylinders is rotated under motor drive, another cylinder produces required
Resistance realizes the tension force to wire electrode.
The two of technical scheme are：
A kind of gradual wire drive device of Wire EDM wire electrode, is characterized in that it using mariages cylinder mechanism, each silk
Cylinder can multi-laminate silk, silk cylinder and main shaft connected using sliding bearing, silk cylinder be respectively provided on two sides with bossing so as to ensure on
The wire electrode of layer is not fall off, and one end and the cam of silk cylinder offset, another to ensure that silk cylinder is contacted all the time with the outline of cam
End offsets with spring, cam every revolution, and silk cylinder realizes the once at the uniform velocity reciprocal of axial direction under the collective effect of cam and spring
Motion, so as to ensure that wire electrode can uniformly arrange silk on silk cylinder；Cam is driven by worm-and-wheel gear, and worm screw is same with main shaft
Axle, main shaft is connected by shaft coupling with servomotor, and servomotor is controlled by the silk cylinder of controller and signal picker collection
Turn signal；The distance of controller control silk cylinder positive movement is more than adverse movement distance, so as to pass through the not right of to-and-fro thread
Etc. property, the micro propulsion of wire electrode is realized, to offset the loss of wire electrode.
The worm gear of described worm-and-wheel gear is coaxially connected with same shaft bevel gears, with the drive on shaft bevel gears and camshaft
Dynamic bevel gear is engaged and drive cam shaft is rotated.
When a silk cylinder in two described silk cylinders is rotated under motor drive, another cylinder produces required
Resistance realizes the tension force to wire electrode.
Described positive movement distance and adverse movement is at least 1 millimeter apart from its difference.
Beneficial effects of the present invention：
The present invention feeds back the turn signal of silk cylinder by signal picker, and using computer-controlled servo motor silk cylinder is driven
Rotate and reverse, realize the gradual motion of wire electrode " advance-rollback-readvance ".Due to silk cylinder can with multi-laminate silk, so
The length of wire electrode is not limited, and employs mariages barrel structure, has ensured the tension force of machining area wire electrode in constant
State；Simultaneously by the not equity of to-and-fro thread so that wire electrode integrally micro propulsion, so that in whole cutting process
In, the loss of wire electrode can be offset by the feeding of overall electrode silk, ensured in the cutting of large thickness and area, electricity
The loss of polar filament in certain controlled range, so as to ensure the machining accuracy of lathe to a certain extent；When fracture of wire situation
During generation, it is only necessary to abandon before breakpoint used wire electrode, changing a new silk cylinder carries out receipts silk, and
Fracture of wire rear electrode silk can switch to fracture of wire point or wear silk in fracture of wire point original place along the consistent joint-cutting Quick air of width, substantially increase
Working (machining) efficiency.
The present invention just at least certain amount per circulation primary（Such as 1mm）New silk be supplemented in participate in cutting, it is thus electric
The loss of polar filament every time just by the 1mm for receiving more（Or other setting values）Wire electrode is accomplishing, it is possible in reducing the course of processing
The loss of wire electrode, becomes apparent from particularly with the workpiece effect for cutting high thickness and big cutting area, so as to improve processing essence
Degree, and when fracture of wire phenomenon occurs, wire electrode can switch to fracture of wire point or in fracture of wire point along the consistent joint-cutting Quick air of width
Silk is worn in original place, substantially increases working (machining) efficiency.
Description of the drawings
Fig. 1 is the gradual to-and-fro thread schematic diagram of mariages cylinder of the present invention.
Fig. 2 is the to-and-fro thread structural scheme of mechanism of the embodiment of the present invention.
Fig. 3 is the molded line schematic diagram of the cam matched with Fig. 2.
L=300m in Fig. 1, δ=1mm, hollow arrow is drivewheel, and filled arrows are driven pulley.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further illustrated.
Embodiment one.
As shown in Figure 1.
A kind of gradual wire-walking method of Wire EDM wire electrode, its essence is that coordination electrode silk does constantly reciprocal fortune
It is dynamic, and length of the length advanced every time always than retreating is a little big, by the not equity of to-and-fro thread so that wire electrode is whole
The micro propulsion of body, to offset the loss of wire electrode.Specific practice is：
First, two silk cylinders are set, while one of them is as wire drawing tube, another puts silk as with damping
Cylinder；
Secondly, as shown in figure 1, under controlling organization control, silk cylinder is rotated forward as drivewheel under Schilling, while upper silk cylinder is made
For driven pulley and produce resistance, make the wire electrode between two silk cylinders form required tension force, this at present silk cylinder be wire drawing tube, on
Silk cylinder to put silk cylinder, when wire electrode positive movement reach setting apart from L+ δ after, original silk cylinder for rotating forward stopped operating, originally
The upper silk cylinder for putting silk is changed into drivewheel under the drive of motor and carries out receipts silk, and the lower silk cylinder for originally rotating forward is changed into driven pulley and is putting
Corresponding resistance is also produced during silk, makes wire electrode produce the tension force needed for adverse movement, now wire electrode adverse movement distance is
L.So repeat, the distance of each positive movement of coordination electrode silk more than each heterodromous distance, i.e., every time advance by circulation
Apart from δ（Span is that between 0.001-1 rice, the value in Fig. 1 is 1 millimeter）, by back and forth not reciprocity wire so that electrode
The overall micro propulsion of silk, to offset the loss of wire electrode.
Using the described gradual wire mode of Wire EDM wire electrode, realize to workpiece especially to big thickness and
The processing of the workpiece of big cutting area, can effectively reduce and the loss in process of coordination electrode silk, so as to
The machining accuracy of lathe is improve to a certain extent；When fracture of wire situation occurs, it is only necessary to abandon having been used before breakpoint
Wire electrode, changing a new silk cylinder carries out receipts silk, and due to the loss very little of wire electrode, wire electrode can be along width
The consistent joint-cutting Quick air of degree switches to fracture of wire point or wears silk in fracture of wire point original place, improves working (machining) efficiency.
Embodiment two.
As Fig. 2,3
A kind of gradual wire-walking method of Wire EDM wire electrode, its essence is that coordination electrode silk does constantly reciprocal fortune
It is dynamic, and length of the length advanced every time always than retreating is a little big, by the not equity of to-and-fro thread so that wire electrode is whole
The micro propulsion of body, to offset the loss of wire electrode.Specific practice is：
First, two silk cylinders are set, while one of them is as wire drawing tube, another puts silk as with damping
Cylinder；
Secondly, make one end of two silk cylinders convex with promote it to move axially while being connected with corresponding motor
Wheel offsets, and the other end for making two silk cylinders offsets with a spring；Under the collective effect of cam and spring, wire electrode is in silk cylinder
Upper uniform row's silk automatically；
3rd, under controlling organization control, silk cylinder is rotated forward as wire drawing tube, another cylinder is used as putting silk cylinder simultaneously
Resistance is produced, makes the wire electrode between two silk cylinders form required tension force, when the distance for putting silk cylinder positive movement and reaching setting
Afterwards, original silk cylinder for rotating forward stops operating, and originally put the silk cylinder of silk carries out receipts silk under the drive of motor, and the silk for originally rotating forward
Cylinder also produces corresponding resistance when putting thread, makes wire electrode produce the tension force needed for adverse movement, so repeats, coordination electrode silk
Every time the distance of positive movement is more than each heterodromous distance, by back and forth not reciprocity raw silk rings so that wire electrode is integrally micro-
Amount propulsion, to offset the loss of wire electrode.
As shown in Fig. 2 the present invention adopts mariages cylinder mechanism, silk cylinder 21,17 to be adopted and be slided with multi-laminate silk, silk cylinder and main shaft
Dynamic bearing connects, and silk cylinder both sides are respectively designed with bossing so as to the wire electrode for ensureing upper strata is not fall off, and silk cylinder is near convex
There is one week bossing at wheel end, to ensure that silk cylinder is contacted all the time with the outline of heart-shaped cam.In theory, the cylinder can meet nothing
The storage silk of limit for length's degree wire electrode requires that the actual wire electrode length selected is 1000m-20000m.Worm-and-wheel gear 5,15 with
And intermeshing bevel gear 23,24 and 9,10, the rotary motion of main shaft is passed to into cam 25,7 according to certain gear ratio,
Wherein bevel gear 23,9 is coaxial with worm gear 5,15 respectively, and bevel gear 24,10 engages respectively with bevel gear 23,9, bevel gear 24,10
It is coaxial with cam 25,7 respectively.The shape of described cam 25,7 is the diameter of the size according to silk cylinder 21,17 and wire electrode 19
Come what is designed, cam 25,7 every revolutions, silk cylinder 21,17 is realized axially under the collective effect of cam 25,7 and spring 20,18
Once at the uniform velocity move back and forth, so as to ensure that wire electrode can uniformly arrange silk on silk cylinder.Silk cylinder can be by singly-bound or spline
Structure is sleeved on main shaft, so that ensure again can be in the drive backspin of spline structure while silk cylinder can be moved axially on main shaft
Turn, realize receiving silk and put silk.Signal picker 1,11（Can be using encoder or coding disk）By the turn signal of two silk cylinders point
Supplementary biography passs computer, by computer-controlled servo motor 2,12 forward and reverse.Described servomotor 2 is from the beginning just
Turn, so as to silk cylinder 21 receives silk, now silk cylinder 17 is used as putting silk cylinder, and forms the moment of resistance, so as to the tension force of coordination electrode silk 19, electricity
The positive movement 300.001m of polar filament 19, signal picker 11,1 Real-time Collection simultaneously feed back the motor message of upper and lower two silk cylinders, when
When reaching commutation and requiring, computer-controlled servo motor 2 is inverted, and silk cylinder 17 receives silk, and silk cylinder 21 puts silk and forms the moment of resistance, now
Silk cylinder 17 as wire drawing tube, silk cylinder 21 as putting silk cylinder, 300 meters of 19 adverse movement of wire electrode, continuous repeatedly above procedure, so as to
The gradual motion of " advance-rollback-readvance " realizing that on the one hand wire electrode moves in circles simultaneously and generally advance.Wire transporting
During, tension force is determined so as to ensure the constant of wire electrode tension by the moment of resistance of computer settings.300m herein and 1mm
For assumed value, other suitable numerical value are also the protection right of the present invention.
So-called gradual wire transporting：It is exactly for example：Coordination electrode silk advance 300.001m, retreats 300m, readvances 300.001
Rice, retreats 300 meters, constantly repeatedly above procedure, and during each to-and-fro thread, wire electrode realizes every time overall pushing ahead
1mm and iterative motion that the overall formula that carries out is advanced.The both sides of two wire storage tubes 21,17 of the present invention are respectively designed with convex
Part is played so as to ensure wire electrode multi-laminate silk, in theory, the wire storage tube can meet the storage silk requirement of indefinite length wire electrode.Snail
Worm and gear mechanism 5,15 and intermeshing bevel gear 23,24 and 9,10, by the rotary motion of main shaft according to certain transmission
Than passing to cam 25,7, wherein bevel gear 23,9 is coaxial with worm gear 5,15 respectively, bevel gear 24,10 respectively with bevel gear 23,9
Engagement, bevel gear 24,10 is coaxial with cam 25,7 respectively.The shape of described cam 25,7 is the chi according to wire storage tube 21,17
The diameter of very little and wire electrode 19 designing, cam 25,7 every revolutions, wire storage tube 21,17 is in cam 25,7 and spring 20,18
Collective effect under realize axial direction once at the uniform velocity move back and forth, so as to ensure that wire electrode can be arranged uniformly on wire storage tube
Silk.The turn signal of two wire storage tubes is delivered separately to computer by the signal picker 1,11 on two main shafts, is led to
Crossing computer-controlled servo motor 2,12 carries out forward and reverse.Described servomotor 2 is rotated forward from the beginning, so as to wire storage tube
21 receive silks, and now wire storage tube 17 is used as putting silk cylinder, and forms the moment of resistance, and so as to the tension force of coordination electrode silk 19, wire electrode 19 is just
To motion 300.001m, signal picker 11,1 Real-time Collection simultaneously feed back the motor message of upper and lower two wire storage tubes, change when reaching
When requiring, computer-controlled servo motor 2 is inverted, and wire storage tube 17 receives silk, and wire storage tube 21 puts silk and forms the moment of resistance, now stores
Silk cylinder 17 as wire drawing tube, wire storage tube 21 as putting silk cylinder, 300 meters of 19 adverse movement of wire electrode, continuous repeatedly above procedure, from
And realize that on the one hand wire electrode moves in circles but while overall advance（Between each circulation advance 1mm-1 rice）" advance-time
Move back-readvance " gradual motion.Tension force is determined so as to ensure wire electrode by the moment of resistance of computer settings during wire transporting
Tension force it is constant.
Embodiment three.
As Figure 2-3.
A kind of gradual wire drive device of Wire EDM wire electrode, it adopts mariages cylinder mechanism, it include wire electrode 19,
Silk cylinder 21,17, servomotor 2,12, encoder 1,11, shaft coupling 3,13, bearing 4,6,14,16, worm and gear 5,15, cone tooth
Wheel 23,24,9,10, cam 25,7, gear shaft 22,8 and spring 20,18, two silk cylinders 17,21 can multi-laminate silk, silk cylinder 17,
21 and main shaft connected using sliding bearing, silk cylinder is respectively provided on two sides with bossing so as to the wire electrode for ensureing upper strata will not be slided
Fall, one end and the cam of silk cylinder offset, to ensure that silk cylinder is contacted all the time with the outline of cam, the other end offsets with spring, convex
Wheel every revolution, silk cylinder realizes once at the uniform velocity moving back and forth for axial direction under the collective effect of cam and spring, so as to ensure that
Wire electrode can uniformly arrange silk on silk cylinder；Silk cylinder can be sleeved on main shaft by singly-bound or spline structure, to ensure silk cylinder energy
Can rotate under the drive of spline structure again while axial movement on main shaft, realize receiving silk and put silk.Cam is by worm gear
Worm mechanism drives, and worm screw is coaxial with main shaft, and main shaft is connected by shaft coupling with servomotor, and servomotor is controlled by controller
With the turn signal of the silk cylinder of signal picker collection；Controller control silk cylinder positive movement distance more than adverse movement away from
From so as to pass through the not equity of to-and-fro thread, the micro propulsion of wire electrode being realized, to offset the loss of wire electrode.Such as Fig. 2 institutes
Show, encoder 11,1 is arranged close on the main shaft of servomotor；Wherein, described silk cylinder can multi-laminate silk, silk cylinder and main shaft
Connected using sliding bearing, silk cylinder both sides are respectively designed with bossing so as to the wire electrode for ensureing upper strata is not fall off, silk cylinder
Have one week bossing near cam end, with ensure silk cylinder all the time with heart-shaped cam（Such as Fig. 3）Outline contact.Silk cylinder diameter
For 158mm, the raised protective bulkhead in both sides is highly 25mm, silk cylinder width（Bossing is not included）For 50mm, wire electrode selection
The molybdenum filament of a diameter of 0.18mm, row's flight lead is 0.25mm, and per layer can enclose wire electrodes around 200 on such silk cylinder, altogether can be around 100 layers
Left and right, wire electrode total length is about 10000m.Described worm-and-wheel gear 5,15 and intermeshing bevel gear 23,24 and
9th, 10, the rotary motion of main shaft is passed to into cam 25,7 according to certain gear ratio, wherein bevel gear 23,9 is respectively and worm gear
5th, 15 is coaxial, and bevel gear 24,10 engages respectively with bevel gear 23,9, and bevel gear 24,10 is coaxial with cam 25,7 respectively.Worm gear snail
The gear ratio of bar 5,15 is 80, bevel gear 23 and 24, and 9 and 10 gear ratio is 5, and the resultant gear ratio of so whole mechanism is
400, just realize that cam circles, silk cylinder turns 400 circles, i.e. cam and turns around drive silk cylinder electrode while move back and forth a time
Silk has just arranged two-layer silk.Make row's silk of wire electrode uniformly, cam must drive wire storage tube to do and at the uniform velocity move back and forth, cam
Shape must determine according to row's flight lead of silk cylinder size and wire electrode.The design of cam is as shown in Figure 2：Taking radius of cam base-circle is
40mm, then the outer contour equation of cam be expressed as in polar coordinate system：ρ=（40+50θ/π）mm（0<θ<π）, work as π<θ<During 2 π,
It is symmetrical.Cam 25,7 every revolutions, wire storage tube 21,17 realizes axle under the collective effect of cam 25,7 and spring 20,18
To once at the uniform velocity move back and forth, so as to ensure that wire electrode can uniformly arrange silk on wire storage tube.
The control process of the gradual motion mode of wire electrode is arranged on as signal picker using the encoder of 10 and is leaned on
On the main shaft of nearly servomotor, then the motion control accuracy of servomotor is：158π/210=0.48mm, with the number of plies increase around
Silk diameter becomes big, so control accuracy is about 0.5mm, can meet the reciprocating required precision of wire electrode.It is given below
The model discussion of electronic wire loss：With the wire electrode of length 300m, with the cutting speed and 100mm of 10m/s2The cutting effect of/min
Rate cuts workpiece, then often cut 105mm2Workpiece, electronic wire loss 0.01mm.The present invention utilizes 10 encoder Real-time Collections simultaneously
The motor message of upper and lower two cylinders is fed back, servomotor 2 is rotated forward from the beginning, and silk cylinder 21 receives silk, now silk cylinder 17 is used as putting
Silk cylinder simultaneously forms the moment of resistance, so as to the tension force of coordination electrode silk 19, the positive movement 300.001m of wire electrode 19.Assume wire electrode institute
The number of plies be k, wire electrode for diameter 0.18mm molybdenum filament, a diameter of 158mm of silk cylinder, when the positive movement of wire electrode 19
300.001m, i.e., when silk cylinder 17 rotates forward 600002/ (158+0.18 k) angle, what computer acquisition encoder sent changes
To signal, and then control servomotor 2 is inverted, and silk cylinder 17 receives silk, and silk cylinder 21 puts silk and forms the moment of resistance；When wire electrode 19 it is reverse
Motion 300m, i.e., when silk cylinder 17 rotates backward 600000/ (158+0.18 k) angle, computer obtains again what encoder was sent
Commutation signal, and then control servomotor 17 and rotate forward, continuous repeatedly above procedure, in front 4 circulations, the angle that silk cylinder 17 is turned over
The relation of θ and time t and the processing sketch of whole mechanism are as shown in Figure 3.Every time circulating electrode silk is supplemented in and carrys out the new of 1mm
Silk, substitutes into the model of above-mentioned foundation, can obtain this segment electrode silk and 0.01mm has been lost, and the discharging gap of the course of processing is 10 μm,
So the waste of wire electrode meets processing request, can realize that silk is worn in original place after fracture of wire.Wherein 300m and 1mm can voluntarily set
Fixed, the selection of its numerical value should can cause the loss satisfaction of wire electrode to require after above-mentioned model is substituted into.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (10)
1. a kind of reciprocal gradual wire-walking method of Wire EDM wire electrode, is characterized in that it is comprised the following steps：
First, two silk cylinders are set, while one of them is as wire drawing tube, another puts silk cylinder as with damping；
Secondly, under controlling organization control, a silk cylinder is made to rotate forward as wire drawing tube, another cylinder is used as putting silk cylinder and produce
Resistance, makes the wire electrode between two silk cylinders form required tension force, when the electrode filament length for putting silk cylinder forward rotating movements and reaching setting
After degree, original silk cylinder for rotating forward stopped operating, and originally puts the silk cylinder of silk reversion is carried out under the drive of motor and receive silk, and it is original just
The silk cylinder for turning also produces corresponding resistance when putting thread, makes wire electrode produce the tension force needed for adverse movement, so repeats, control
The wire electrode length of each forward rotating movements of wire electrode inverts the length that wire electrode is moved more than each, by back and forth not to equal length
Wire transporting so that wire electrode integrally micro propulsion, to offset the loss of wire electrode.
2. method according to claim 1, is characterized in that the wire electrode length and reversion fortune of described each forward rotating movements
The difference 0.001-1 rice of dynamic wire electrode length.
3. method according to claim 1, the length that it is characterized in that described wire electrode is 1000-20000 rice.
4. method according to claim 1, is characterized in that it using mariages cylinder mechanism, each cylinder energy multi-laminate silk,
Silk cylinder is respectively provided on two sides with bossing so as to the wire electrode for ensureing upper strata is not fall off；Main shaft is by shaft coupling and servomotor
It is connected, servomotor is controlled by the turn signal of the silk cylinder of controller and signal picker collection；Controller control silk cylinder is positive
The distance of rotation is more than counter-rotational distance, so as to pass through the not equity of to-and-fro thread, realizes the micro propulsion of wire electrode,
To offset the loss of wire electrode.
5. method according to claim 1, is characterized in that a silk cylinder in described two silk cylinder in motor band
During dynamic lower rotation, the resistance needed for another cylinder generation realizes the tension force to wire electrode.
6. method according to claim 1, is characterized in that considering to be conveniently replaceable wire electrode, and two silk cylinders are adopted and are enclosed within silk
The mode of cylinder main shaft, and can remove.
7. a kind of gradual wire drive device of Wire EDM wire electrode, is characterized in that it using mariages cylinder mechanism, each cylinder
Equal energy multi-laminate silk, silk cylinder and main shaft are connected using sliding bearing, and silk cylinder is respectively provided on two sides with bossing so as to ensure upper strata
Wire electrode be not fall off, one end and the cam of silk cylinder offset, to ensure that silk cylinder is contacted all the time with the outline of cam, the other end
Offset with spring, cam every revolution, silk cylinder realizes once at the uniform velocity back and forth transporting for axial direction under the collective effect of cam and spring
It is dynamic, so as to ensure that wire electrode can uniformly arrange silk on silk cylinder；Cam is driven by worm-and-wheel gear, and worm screw is same with main shaft
Axle, main shaft is connected by shaft coupling with servomotor, and servomotor is controlled by the silk cylinder of controller and signal picker collection
Turn signal；The distance of controller control silk cylinder positive movement is more than adverse movement distance, so as to pass through the not right of to-and-fro thread
Etc. property, the micro propulsion of wire electrode is realized, to offset the loss of wire electrode.
8. the gradual wire drive device of Wire EDM wire electrode according to claim 7, is characterized in that described worm gear
The worm gear of worm mechanism is coaxially connected with same shaft bevel gears, engages with the driving bevel gear on camshaft with shaft bevel gears and drives
Cam axle.
9. the gradual wire drive device of Wire EDM wire electrode according to claim 7, is characterized in that described mariages
When a silk cylinder in cylinder is rotated under motor drive, the resistance needed for another cylinder is produced is realized opening wire electrode
Power is controlled.
10. the gradual wire drive device of Wire EDM wire electrode according to claim 7, is characterized in that described forward direction
Move distance and adverse movement are at least 1 millimeter apart from its difference.
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| EP3932601A1 (en) * | 2020-07-03 | 2022-01-05 | Agie Charmilles SA | Method of controlling high-speed wire cutting |
| US11772177B2 (en) | 2020-08-07 | 2023-10-03 | Agie Charmilles Sa | Method for high-speed wire cutting |
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