CN105345182A - Reciprocating wire feeding type wire cut electrical discharge machining machine tool electrode wire control method - Google Patents
Reciprocating wire feeding type wire cut electrical discharge machining machine tool electrode wire control method Download PDFInfo
- Publication number
- CN105345182A CN105345182A CN201510921737.1A CN201510921737A CN105345182A CN 105345182 A CN105345182 A CN 105345182A CN 201510921737 A CN201510921737 A CN 201510921737A CN 105345182 A CN105345182 A CN 105345182A
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- wire
- wire feeding
- distance
- fro
- reciprocating
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Classifications
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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
-
- 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
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
-
- 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
- B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
- B23H7/18—Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention discloses a reciprocating wire feeding type wire cut electrical discharge machining machine tool electrode wire control method. The control method comprises the following steps: multiple times of reciprocating wire feeding and adjustable wire feeding between every adjacent two times of reciprocating wire feeding are performed; each time of reciprocating wire feeding: two reversing switches and programmable controllers are used for controlling servo motors to drive wire storage cylinders to repeatedly rotate forwards and reversely by multiple times, and meanwhile, angle encoders are used for detecting rotating angles of the wire storage cylinders and returning to the programmable controllers, so that the wire storage cylinders rotate forwards and reversely by preset angles to realize multiple times of circular reciprocating wire feeding of electrode wires with preset lengths; and each time of adjustable wire feeding: after the previous time of reciprocating wire feeding is finished, the programmable controllers are used for controlling the servo motors to drive the wire storage cylinders to forwards rotate by preset angles to perform the forward adjustable wire feeding by a period of distance, and the sum of the distance of the forward adjustable wire feeding and the distance of the following reciprocating wire feeding is smaller than the distance of the adjustable wire feeding and the previous reciprocating wire feeding. The control method can prevent electrode wires from being broken due to loss, prevents frequent replacement of the electrode wires, guarantees normal operation of machine tools, and is high in automation degree.
Description
Technical field
The present invention relates to a kind of control method of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode.
Background technology
In view of to-and-fro wire-travelling type electric spark linear cutting machine processing characteristic, for guaranteeing that wire electrode can realize back and forth running electric discharge processing, two reversing switches are provided with when wire storage cylinder moves, namely when wire storage cylinder runs to side (forward) extreme limit of travel, touch this side (forward) reversing switch, wire cylinder motor changes rotation direction (just changing reversion), drive wire storage cylinder to opposite side (minus side) extreme sport, when touching opposite side (minus side) reversing switch, wire cylinder motor changes rotation direction (reversion becomes rotating forward), run to positive side, so repeatedly move, namely achieve and back and forth run processing.During Wire-cut Electrical Discharge Machining, high-frequency pulse voltage is loaded between wire electrode and workpiece, drive workpiece follow procedure track to move by workbench, form microgap electric discharge between wire electrode and workpiece, workpiece galvanic corrosion is shaped, while galvanic corrosion workpiece, wire electrode equally can by ablation to a certain extent, and movement wire system exists frictional dissipation in addition, therefore along with the growth of process time, wire electrode diameter can be more and more less, until cannot carry out normal process.Relatively little for ensureing the galvanic corrosion degree that wire electrode is subject to, therefore the wire electrode linear velocity higher (8-15m/s) back and forth run, but when wire storage cylinder motor commutation, certainly exist deceleration-commutation-boosting velocity procedure again, if load high frequency voltage in this process between wire electrode and workpiece, wire electrode is probably directly blown, occur for avoiding this situation, when wire storage cylinder positive and negative commutation signal access, high frequency pulse power supply exports simultaneously and closes by system, now board feeding processing stops to after commutation time delay completes and recovers processing again, therefore, the wire electrode that wire storage cylinder is wound around certainly exists in both sides and has neither part nor lot in electric discharge processing buffer section, this section wire electrode diameter is apart from outside minimum frictional dissipation in theory, lossy hardly, so just bring a problem, along with the growth of process time, participate in processing sections wire electrode attenuating, therefore its processing work formation joint-cutting also can be more and more less, and the width cutting gap equals region of discharge segment electrode filament diameter adds 0.02mm discharging gap, when the region of discharge segment electrode filament diameter after loss add 0.02mm discharging gap be less than buffer field wire electrode diameter time, joint-cutting before the buffer field of wire electrode is then difficult to enter, wire electrode is easily caused to break at buffer card, need frequent shutdown, change electric wire, affect the normal operation of lathe.
Summary of the invention
The object of the invention is for prior art above shortcomings, a kind of control method of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode is provided, it can prevent wire electrode from occurring breaking phenomenon because of loss, avoids frequent change electric wire, ensures the normal operation of lathe.
For achieving the above object, the control method of a kind of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode of the present invention, is characterized in that comprising: to-and-fro thread for several times and the adjustment wire often between adjacent twice to-and-fro thread; Each to-and-fro thread: all done the forward and reverse rotation repeated for several times by two reversing switches, Controlled by Programmable Controller driven by servomotor wire storage cylinder, detect the rotational angle of wire storage cylinder by angular encoder simultaneously and feed back to Programmable Logic Controller, make wire storage cylinder by the forward and reverse rotation of angle preset, realize several wires that move in circles of preset length wire electrode; Each adjustment wire: after last to-and-fro thread terminates, predetermined angle is rotated forward by Controlled by Programmable Controller driven by servomotor wire storage cylinder, carry out the forward adjustment wire of a segment distance, the distance of this section of forward adjustment wire adds that subsequently the distance sum of to-and-fro thread next time is all less than the distance of the last to-and-fro thread of this adjustment wire.
The present invention is according to the consistent relationship of the diameter loss of wire electrode with the electric discharge cumulative time, in the permission exhaustion range that wire electrode effectively discharges, based on wire electrode initial length, once wire is adjusted after to-and-fro thread, wire electrode is made to carry out the forward adjustment wire of a segment distance, carry out to-and-fro thread next time again, and the distance of each adjustment wire adds that the distance sum of next to-and-fro thread subsequently is all less than the distance of this last to-and-fro thread of adjustment wire, the processing sections of last to-and-fro thread is made to be adjusted to the buffer field of next to-and-fro thread, by successively reducing the wire electrode length of to-and-fro thread, so just can make the wire electrode diameter of buffer field all the time along with the diameter reduction of processing section and reduce, thus the wire electrode diameter realizing buffer field is less than the processing gap (processing district segment electrode filament diameter adds 0.02mm discharging gap) of workpiece all the time, the phenomenon of silk cylinder pinch off wire electrode when running to commutation position so just can be avoided in whole process, avoid frequent change electric wire, ensure the normal operation of lathe, and by controlling the distance of each to-and-fro thread and adjustment wire to Programming of programmable controller and angular encoder, not only automaticity is high, buffer field adjustment accurately, eliminate the impact of human factor, guarantee without breaking phenomenon.
As a further improvement on the present invention, in each to-and-fro thread, all the forward and reverse rotation of driven by servomotor wire storage cylinder is controlled at preset timed intervals by Programmable Logic Controller; To-and-fro thread can be realized be connected with adjustment the automatic of wire, improve intelligence degree;
In sum, the present invention can prevent wire electrode from occurring breaking phenomenon because of loss, avoids frequent change electric wire, ensure the normal operation of lathe, and automaticity is high, and buffer field adjustment accurately.
Accompanying drawing explanation
Fig. 1 is the structure diagram of to-and-fro wire-travelling type electric spark linear cutting machine wire-moving system.
Fig. 2 is the front view of wire storage cylinder drive unit.
Fig. 3 is the wire electrode distribution map be around on wire storage cylinder.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
As shown in Figure 1 to Figure 3, the wire-moving system of to-and-fro wire-travelling type electric spark linear cutting machine comprises wire storage cylinder 1, the wire electrode 2 be around on wire storage cylinder 1, several commutation guide wheel 8, upper block 3, lower tumbler 4, and workpiece 14 is located between upper block 3 and lower tumbler 4; Wire storage cylinder 1 is coupled on main shaft 7, one end of main shaft 7 is connected with servomotor 11 by shaft coupling 12, the other end is connected with drive lead screw 10 by driving gear pair 13, angular encoder 5 is provided with in the end of drive lead screw 10, drive lead screw 10 is provided with the nut 9 connected firmly with bearing, wire storage cylinder 1 is located on line slideway 6 by supporting plate, and servomotor 11, angular encoder 5 are all connected with Programmable Logic Controller (PLC, not shown);
The present invention is used for the control method of a kind of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode of above-mentioned wire-moving system, comprise: A) first time to-and-fro thread: drive wire storage cylinder 1 to do the forward and reverse rotation repeated for several times at preset timed intervals by two reversing switch (not shown), Controlled by Programmable Controller servomotor 11, detect the rotational angle of wire storage cylinder 1 by angular encoder 5 simultaneously and feed back to Programmable Logic Controller, make wire storage cylinder 1 by the angle forward and reverse rotation within a certain period of time preset, realize the several to-and-fro thread of preset length wire electrode; During this period, wire electrode 2 is received one at the two ends one of wire storage cylinder 1 and is put; Except being carried in by high frequency pulse power supply between wire electrode 2 and workpiece 14 during positive decommuntation, galvanic corrosion processing is carried out to workpiece 14; When positive decommuntation, closedown high frequency pulse power supply, that segment electrode silk received at the two ends of wire storage cylinder 1 or put is buffer field (that segment electrode silk that namely in Fig. 2, L1 is corresponding), and that segment electrode silk that wire storage cylinder 1 two ends are received or put when carrying out galvanic corrosion is processing sections; Owing to being to-and-fro thread, at the end of this to-and-fro thread, wire electrode 2 roughly gets back to initial manufacture position on wire storage cylinder 1; B) first time adjusts wire: after first time, to-and-fro thread terminated, wire storage cylinder 1 is driven to rotate forward predetermined angle by Controlled by Programmable Controller servomotor 11, carry out the forward adjustment wire of a segment distance, this segment distance is less than the distance of first time to-and-fro thread; Next second time to-and-fro thread is carried out again, now the distance of first time adjustment wire is the buffer field (that segment electrode silk that namely in Fig. 2, L2 is corresponding) of second time to-and-fro thread, and once adjusts the adjustment that wire can realize wire storage cylinder 1 two ends buffer field simultaneously; The processing sections of the first to-and-fro thread is made to be adjusted to the buffer field of second time to-and-fro thread after first time adjustment wire, the wire electrode diameter of buffer field is reduced along with the diameter reduction of processing section, thus the wire electrode diameter realizing buffer field is less than the processing gap of workpiece all the time, can prevent second time to-and-fro thread time wire electrode there is breaking phenomenon because of loss, avoid change electric wire, ensure the normal operation of lathe; C) next carry out second time to-and-fro thread, second time adjustment wire and for several times to-and-fro thread and adjustment wire circulation until the to-and-fro thread of the N time; The process of each to-and-fro thread is all identical with first time to-and-fro thread, it is identical that the process of each adjustment wire all adjusts wire with first time, the second time to-and-fro thread distance that just wire storage cylinder 1 rotational angle is corresponding adds that the distance of first time adjustment wire is less than the distance of first time to-and-fro thread, can ensure that the processing sections of second time to-and-fro thread is still the processing sections of first time to-and-fro thread, can prevent card from breaking; The like, the distance of each adjustment wire adds that the distance sum of next to-and-fro thread subsequently is all less than the distance of the last to-and-fro thread of this adjustment wire.
The present invention is illustrated: as shown in Figure 3, suppose wire storage cylinder 1 to be wound with 500m long electrode silk, during first time to-and-fro thread, angularly encoder 5 detection signal send Programmable Logic Controller to count, if the left side limit is O, limit on the right-right-hand limit is 500, for ensuring certain buffer field, actual processing service condition is like this: during initial bit, right 0-5m is left buffering area, 495-500m section is right buffering area, then actual participation electric discharge processing sections wire electrode is the section between 5m and 495m, i.e. 5m < actual processing section < 495m; Along with process time passes, between 5m < actual processing section < 495m, wire electrode attenuates, diminish to electric discharge joint-cutting, the left buffering area of 0-5m and the right buffer field wire electrode of 495-500m are processed because having neither part nor lot in discharge, string diameter is substantially unchanged, if now still processed, between buffering area, wire electrode will block disconnected because entering joint-cutting.Now, can only be heavily renew silk to reprocess, time-consuming and cause waste.
Therefore this method is after first time, to-and-fro thread terminated, relation is consumed according to machining energy, process time and silk, set up certain corresponding relation, pass through Programmable Logic Controller, cannot enter before joint-cutting can cause fracture of wire when foreseeing by tapering to, Programmable Logic Controller drives wire storage cylinder 1 to turn an angle by servomotor 11, the buffer field of second time to-and-fro thread can be changed, namely the left buffering area of 5-10m is adjusted to by the left buffering area of left 0-5m, right 495-500m section is that to be adjusted to 490-495m be right buffering area to right buffering area, reruns; Left when the buffer field of to-and-fro thread adjusts again is for the third time 10-15m buffer field, and the right side is 485-490m buffer field, so circulates, and thoroughly cannot process until wire electrode 2 is lost to.
The present invention is according to the consistent relationship of the diameter loss of wire electrode with the electric discharge cumulative time, in the permission exhaustion range that wire electrode effectively discharges, based on wire electrode initial length, because once adjusting wire after to-and-fro thread, wire electrode 2 is made to carry out the forward wire of a segment distance, carry out to-and-fro thread next time again, and the distance of each adjustment wire adds that the distance sum of next to-and-fro thread subsequently is all less than the distance of the last to-and-fro thread of this adjustment wire, the processing sections of last to-and-fro thread is made to be adjusted to the buffer field of next to-and-fro thread, by successively reducing the wire electrode length of to-and-fro thread, so just can make the wire electrode diameter of buffer field all the time along with the diameter reduction of processing section and reduce, thus the wire electrode diameter realizing buffer field is less than the processing gap (processing district segment electrode filament diameter adds 0.02mm discharging gap) of workpiece all the time, the phenomenon of silk cylinder pinch off wire electrode when running to commutation position so just can be avoided in whole process, avoid frequent change electric wire, ensure the normal operation of lathe, and by controlling the distance of each to-and-fro thread and adjustment wire to Programming of programmable controller and angular encoder 5, not only automaticity is high, buffer field adjustment accurately, without the need to human intervention, namely ensure that the continuity of processing, guarantee without breaking phenomenon, maximum using wire electrode again, reduce the waste of wire electrode.
Claims (2)
1. a control method for to-and-fro wire-travelling type electric spark linear cutting machine wire electrode, is characterized in that comprising: to-and-fro thread for several times and the adjustment wire often between adjacent twice to-and-fro thread; Each to-and-fro thread: all done the forward and reverse rotation repeated for several times by two reversing switches, Controlled by Programmable Controller driven by servomotor wire storage cylinder, detect the rotational angle of wire storage cylinder by angular encoder simultaneously and feed back to Programmable Logic Controller, make wire storage cylinder by the forward and reverse rotation of angle preset, realize several wires that move in circles of preset length wire electrode; Each adjustment wire: after last to-and-fro thread terminates, all rotate forward predetermined angle by Controlled by Programmable Controller driven by servomotor wire storage cylinder, carry out the forward adjustment wire of a segment distance, the distance of this section of forward adjustment wire adds that subsequently the distance sum of to-and-fro thread next time is all less than the distance of the last to-and-fro thread of this adjustment wire.
2. the control method of a kind of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode as claimed in claim 1, is characterized in that all controlling the forward and reverse rotation of driven by servomotor wire storage cylinder at preset timed intervals by Programmable Logic Controller in each to-and-fro thread operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510921737.1A CN105345182B (en) | 2015-12-14 | 2015-12-14 | A kind of control method of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode |
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| CN201510921737.1A CN105345182B (en) | 2015-12-14 | 2015-12-14 | A kind of control method of to-and-fro wire-travelling type electric spark linear cutting machine wire electrode |
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| CN105345182B CN105345182B (en) | 2017-07-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052482A (en) * | 2017-03-31 | 2017-08-18 | 广东商鼎智能设备有限公司 | Spark-erosion machine tool hardboard and spark-erosion machine tool control system |
| CN109332830A (en) * | 2018-11-30 | 2019-02-15 | 自贡市嘉特数控机械制造有限公司 | The wire drive device and method of to-and-fro wire-travelling type electric spark linear cutting machine |
| CN109332829A (en) * | 2018-11-30 | 2019-02-15 | 自贡市嘉特数控机械制造有限公司 | The control device and wire-walking method of Wire Electrode WEDM |
| CN112427756A (en) * | 2020-10-26 | 2021-03-02 | 浙江三奇机械设备有限公司 | Automatic reversing method and system for wire barrel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109332829A (en) * | 2018-11-30 | 2019-02-15 | 自贡市嘉特数控机械制造有限公司 | The control device and wire-walking method of Wire Electrode WEDM |
| CN109332829B (en) * | 2018-11-30 | 2023-08-04 | 自贡市嘉特数控机械制造有限公司 | Wire feeding method for wire electrode of wire cut electric discharge machine |
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| CN112427756A (en) * | 2020-10-26 | 2021-03-02 | 浙江三奇机械设备有限公司 | Automatic reversing method and system for wire barrel |
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