CN108237276A - A kind of device and method of automatic inhibition molybdenum filament form and position - Google Patents
A kind of device and method of automatic inhibition molybdenum filament form and position Download PDFInfo
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- CN108237276A CN108237276A CN201810225239.7A CN201810225239A CN108237276A CN 108237276 A CN108237276 A CN 108237276A CN 201810225239 A CN201810225239 A CN 201810225239A CN 108237276 A CN108237276 A CN 108237276A
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- molybdenum filament
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- power supply
- 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
- B23H7/02—Wire-cutting
- B23H7/08—Wire electrodes
- B23H7/10—Supporting, winding or electrical connection of wire-electrode
- B23H7/105—Wire guides
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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
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The application discloses a kind of device of automatic inhibition molybdenum filament form and position, including：Matrix with through-hole, the mutually fixed and left and right left coil arranged apart being arranged in the through-hole and right coil with described matrix, the molybdenum filament channel being formed between the left coil and the right coil, it is the coil power supply circuit of the left coil and the right coil power supply so as to the generation electromagnetic field at the molybdenum filament channel, driving described matrix surrounds the power-equipment of molybdenum filament channel rotation.The application can make the linear posture of molybdenum filament to the maximum extent, so as to improve linear cutter quality.
Description
Technical field
This application involves wire cutting machine tool fields, and in particular to a kind of device of automatic inhibition molybdenum filament form and position and side
The nc wire-cutting of method and this device of configuration.
Background technology
Linear cutter is to make electrode using the fine wire of continuous moving, and pulse spark electric discharge removal gold is carried out to workpiece
Belong to or excision forming, the equipment are mainly used for processing superhard steel, hard alloy, the work that variously-shaped complicated and precision is tiny
Part.Wire electrode (hereinafter referred to as molybdenum filament) is a kind of fine wire being fabricated by noble metals such as molybdenums, and molybdenum filament passes through medium (work
Liquid, emulsion, electrolyte etc.) it discharges with workpiece, corrosion metal achievees the purpose that excision forming.
In recent years, with the continuous development of automatic technology, various digital control wire-electrode cutting equipment (refer both to middle wire-moving to cut below
Cutting mill bed) it is gradually popularized in electric machining industry, the technologies such as mechanical precision, position-force control, high frequency electric source all reach
Higher level, such as：Tracking process control technology etc. is installed and used and used to constant tension device so that because of wire machine
Molybdenum filament radial vibration amplitude caused by structure constantly reduces, and it is relatively stagnant to implement active technology to space form and position
Afterwards, the space form and position caused by molybdenum filament Discharge Force is increasingly becoming the main reason for influence precision, is always to hinder processing matter
The technical barrier that amount and efficiency improve.Existing wire cutting machine tool, molybdenum filament stress are mainly the active force (Discharge Force) of discharge channel
With axial tensile force etc., (such as Fig. 1, below letter when molybdenum filament is generated space form and position by laterally (radial direction) Discharge Force effect
Claim form and position), it is necessary to it (is cut by two guide holes above and below processing sections molybdenum filament to limit molybdenum filament deviation guide wheel outer fulcrum
Point) line distance (molybdenum filament amount of deflection), this method to reduce form and position tool has certain effect, but since manufacturing industry is to part
Accuracy class requirement is higher and higher, there is an urgent need to improved technology with General Promotion equipment machining accuracy, the shape of guider reduction at present
Position changing method mainly has following deficiency：
1st, Discharge Force causes molybdenum filament form and position and molybdenum filament and guider is made to generate sliding friction, makes molybdenum filament and guider
Abrasion must seriously regularly replace very much, thereby reduce production efficiency, increase production cost；Because abrasion must be adjusted often
Molybdenum filament offset is difficult to ensure that complicated big workpiece Continuous maching precision.
2nd, guider is to inhibiting the form and position caused by Discharge Force not have initiative, with less " digitlization, automatic
Change " using control ability, and to molybdenum filament, passive restriction effect is limited (guide hole diameter is than molybdenum filament diameter greatly at least 0.02mm),
The influence of Discharge Force is only reduced to a certain extent, i.e. the form and position of molybdenum filament is inevitable, also can not just realize and allow at molybdenum filament
In ideally processing, make machining accuracy be difficult to further improve and guiding discharge state labile influence process velocity.
3rd, since form and position can not be overcome, make Accuracy of finish be a greater impact (Form and position error is big, concave-convex mold not
It is mating etc.) or even it is susceptible to serious quality problems such as " angles of collapsing ".
4th, since wire cutting is often (multiple) processing of multitool, and Discharge Force the putting much smaller than the first knife that the second knife is later
Electric power, making the machining locus line that the first knife and follow-up second knife (or multitool) process, (Discharge Force is different, and amount of deflection and arc shape are all
It is different) registration is bad.
5th, since Discharge Force effect makes molybdenum filament processing channel for arc shaped, galvanic corrosion bits are taken out of electric discharge so as to slow down working solution
Phenomena such as region is easy to cause discharge condition deterioration, generates secondary discharge or short circuit.
The above problem is not effectively improved always for many years.Therefore, change electric machining form and position suppression technology
Backwardness makes more scientific EDM Technology, wisdom, automation and precision have numerical control line cutting technology progress
Important meaning.
Invention content
The purpose of the application is：In view of the above-mentioned problems, the application provides a kind of device of automatic inhibition molybdenum filament form and position, together
When also propose a kind of nc wire-cutting that this device is configured, to make the linear posture of molybdenum filament to the maximum extent, so as to improve
Linear cutter quality and efficiency.
The technical solution of the application is：
A kind of device of automatic inhibition molybdenum filament form and position, which is characterized in that including：
Matrix with through-hole,
The mutually fixed and left and right left coil arranged apart being arranged in the through-hole and right coil with described matrix,
The molybdenum filament channel being formed between the left coil and the right coil,
It is the coil power supply of the left coil and the right coil power supply so as to the generation electromagnetic field at the molybdenum filament channel
Circuit and
Described matrix is driven to surround the power-equipment of molybdenum filament channel rotation.
The application based on the above technical solution, further includes following preferred embodiment：
The power-equipment is stepper motor.
The motor driver of the stepper motor and the coil power supply circuit with the digital control system of nc wire-cutting
Circuit connects.
The left coil and the right coil are coaxially arranged, and the axis of the left coil and the right coil with it is described
The axially bored line of through-hole intersects vertically.
The left coil and the right coil are arranged symmetrically centered on the axially bored line of the through-hole.
Described matrix includes：
Magnet ring,
The slip ring being coaxially fixed below the magnet ring,
Be fixed on the slip ring periphery external toothing and
Two magnetic poles that are mutually fixed with the magnet ring and radially-inwardly stretching out；
The left coil and the right coil are respectively wound around in two magnetic poles, and the power-equipment passes through gear
Transmission mechanism is sequentially connected with the external toothing.
A pedestal is further included, the slip ring is slidably connected with pedestal pivot.
Further include magnetic shielding cover, the magnetic shielding cover is by the left coil, the right coil, the magnet ring, the slip ring
It is accommodated in the inner with two magnetic poles.
A kind of nc wire-cutting is connect including high-frequency line cutting power supply and with the high-frequency line cutting power supply circuit
Digital control system, the upper and lower ends of the high-frequency line cutting power supply to the molybdenum filament straight line active section of nc wire-cutting are passed through flow direction quilt
The high-frequency pulse current of workpiece is cut, further includes the automatic device for inhibiting molybdenum filament form and position of above structure, the molybdenum filament is straight
Line active section is arranged across the molybdenum filament channel.
The device of the automatic inhibition molybdenum filament form and position is arranged in the cut workpiece there are two setting altogether
Two opposite sides.
The advantages of the application is：
1st, this morpheme control device of the application implements " number by active force always along cut direction to processing sections molybdenum filament
Word " is precisely controlled, and so as to actively offset Discharge Force to reduce or even eliminate molybdenum filament space form and position, makes molybdenum to the maximum extent
Silk is consistent (approximate " standard " straight line posture) with upper and lower guide wheel outer fulcrum (point of contact) line direction, so as to improve work pieces process essence
Degree.
2nd, molybdenum filament form and position is reduced or even eliminated, molybdenum filament is made to be in the mobile posture of stability line, helps to maintain molybdenum
The stability of silk processing sections, improves gap discharge machining state, improves Numerical Control Wire Cutting speed.Meanwhile also improve
One knife and the machining locus line registration of follow-up second knife (or multitool) processing.
3rd, the present apparatus can be reduced its morpheme spatial variations, led up and down so as to be greatly decreased by offsetting molybdenum filament Discharge Force
Sliding friction to device and molybdenum filament improves the service life of the two, realizes contactless " gear silk ".In addition the present apparatus connects to be non-
Control device is touched, is effectively reducing the abrasion to molybdenum filament simultaneously, working solution will not generate device the injection of molybdenum filament any
It influences.
4th, since the present apparatus can reduce molybdenum filament amount of deflection, it is approximately a straight line to make molybdenum filament processing channel, so as to be conducive to work
Make the problems such as liquid takes galvanic corrosion bits out of region of discharge, largely reduces secondary discharge or short circuit occurrence probability.
Description of the drawings
The application is further described with reference to the accompanying drawings and embodiments：
Fig. 1 is molybdenum filament form and position schematic diagram in line cutting processing；
Fig. 2 is the whole schematic diagram of nc wire-cutting in the embodiment of the present application；
Fig. 3 is the internal structure schematic diagram for the device for inhibiting molybdenum filament form and position in the embodiment of the present application automatically；
Fig. 4 is the outside drawing for the device for inhibiting molybdenum filament form and position in the embodiment of the present application automatically.
Wherein：P- is cut workpiece, q- molybdenum filaments, 1- left coils, the right coils of 2-, 3- slip rings, 4- stepper motors, 5- molybdenum filaments
Channel, 6- magnet rings, 7- magnetic poles, 8- pedestals, 9- magnetic shielding covers, 10- high-frequency line cutting power supplies, 11- molybdenum filament straight line active sections, 12-
Upper guide, guider under 13-, 14- external toothings, 15- gear drives.
Specific embodiment
Fig. 2 shows a specific embodiment of this nc wire-cutting of the application, with traditional numeric-control wire cutting machine phase
With, including：Molybdenum filament (wire electrode), the wire storage cylinder of folding and unfolding molybdenum filament, the numerous guide wheels for guiding molybdenum filament, driving molybdenum filament move
Motor, high-frequency line cutting power supply 10, the digital control system being connect with 10 circuit of high-frequency line cutting power supply.Aforementioned molybdenum filament includes cutting
The molybdenum filament straight line active section 11 of workpiece is cut, molybdenum filament straight line active section 11 is oriented to by upper guide 12 and lower guider 13, limit
Molybdenum filament processed deviates, vibration.The upper and lower ends of high-frequency line cutting power supply 10 to the molybdenum filament straight line active section 11 of nc wire-cutting are led to
Enter the high-frequency pulse current that flow direction is cut workpiece p.
The key improvements of the present embodiment are that the nc wire-cutting is provided with the automatic dress for inhibiting molybdenum filament form and position
It puts.
With reference to shown in Fig. 3, the above-mentioned automatic device for inhibiting molybdenum filament form and position includes：
Matrix with through-hole,
Left coil 1 and right coil 2 (left coil 1 and right coil 2 one mutually fixed with above-mentioned matrix and be arranged in through-hole
The first from left right side is arranged apart),
Be formed in the molybdenum filament channel 5 between left coil 1 and right coil 2 (namely left coil 1 and right coil 2 and between every
Standard width of a room in an old-style house gap),
For left coil 1 and right coil 2 power supply so as at molybdenum filament channel 5 generate electromagnetic field coil power supply circuit and
Matrix is driven to surround the power-equipment of molybdenum filament channel 5 (pivot) rotation.
Molybdenum filament straight line active section 11 passes through molybdenum filament channel 5.
In the present embodiment, above-mentioned power-equipment is stepper motor 4, the motor driver of the stepper motor 4 and above-mentioned line
Circle power supply circuit is connect with the digital control system circuit of nc wire-cutting itself.Aforementioned coil power supply circuit includes high-precision
Digital control power constant current driving equipment.
Above-mentioned left coil 1 and right coil 2 is coaxially arranged, and through-hole on the axis and matrix of left coil 1 and right coil 2
Axially bored line intersect vertically.Further, left coil 1 and right the coil 2 symmetrical cloth centered on the axially bored line of the through-hole
It puts.
In order to facilitate the mounting arrangements of above-mentioned two coil, while influence of the strengthening electric current to magnetic field at molybdenum filament channel 5, on
It states matrix and employs this structure type：Matrix includes：Magnet ring 6 is coaxially fixed on the slip ring 3 of 6 lower section of magnet ring, is fixed on slip ring
The external toothing 14 of 3 peripheries, (magnetic pole 7 and magnet ring 6 are integrated two magnetic poles 7 fixed with 6 one of magnet ring and radially-inwardly stretched out
Formula structure).Above-mentioned left coil 1, right coil 2 wind be arranged in aforementioned two magnetic pole 7 respectively, the stepping as power-equipment
Motor 4 is sequentially connected by gear drive and external toothing 14, and then drives slip ring 3, magnet ring 6, magnetic pole 7, left coil 1 and the right side
Coil 2 rotates.
The materials such as silicon steel or permalloy that aforementioned magnet ring 6 and magnetic pole 7 use magnetic conductivity very high, and magnet ring 6 and magnetic pole
7 are an integral structure.As shown in figure 4, in order to which the present apparatus is made not influence other components or not by external magnetic fields, also configure
Magnetic shielding cover 9, the magnetic shielding cover 9 is by above-mentioned left coil 1, right coil 2, preceding coil 3, rear coil 4, magnet ring 6 and four magnetic poles 7
It accommodates in the inner, the outer surface of magnetic shielding cover 9 is the soft magnetic material of high permeability.
It is generated when left coil 1 and right coil 2 pass to same direction current, in 5 region of molybdenum filament channel between two magnetic poles near
Like uniform magnetic field.No current in molybdenum filament is not in during discharge condition, is not also just acted on by Ampere force；When processing electric discharge
Wherein flow through dither direct current, at this moment molybdenum filament in magnetic field by Ampere force, size and Orientation and coil current, the molybdenum of power
Silk electric current etc. factors it is related (1, the parameters such as other factors such as coil turn be considered constant for the time being；2nd, pass through high frequency electric source parameter
Molybdenum filament average operating current can be set, i.e., known to molybdenum filament average operating current), size of current, that is, controllable force in control coil
Size (straight wire (molybdenum filament) current direction is constant, and magnetic direction and ampere force direction have correspondence).And the present embodiment will
The two coils are placed on the rotating mechanism being made of components such as stepper motor 4 and matrixes, then by rotating two coils
Magnetic direction can be changed.Electromotion straight wire (molybdenum filament) is acted in above-mentioned magnetic field by Ampere force, and conducting wire (molybdenum filament) by
Force direction is related with magnetic direction (rotation position), and the factors such as size and coil current are related.
Ampere force (counteracting force) size is directly proportional to electric current, coil magnetic field intensity and magnetic fields length, basis in design
Discharge Force range determines the parameters such as magnetic permeability μ, the number of turn, coil radius.Ampere force direction is obtained from current working motion course bearing
, Ampere force size is determined by high frequency machined parameters.Ampere force direction is realized by controlling the rotation angle of rotating mechanism；Peace
Training power size can calculate, control coil size of current (and direction, by controlling current direction in practical application, then rotating dress
To put only need to rotate in the range of 180 degree) it obtains.
Because wire cutting discharge process is extremely complex, when discharge, the factors such as immediate current size it is unpredictable, this dress
Put dexterously with Discharge Force there is synchronous, direct ratio to apply characteristic using Ampere force, i.e. electric discharge causes Discharge Force and generates electric discharge electricity
Stream, discharge current generates Ampere force in magnetic field simultaneously, and two power sizes are also directly proportional to discharge current.Discharge Force and Ampere force
There is direction simultaneously to cancel out each other on the contrary, so as to dexterously reduce molybdenum filament form and position.Due in process, molybdenum filament short circuit shape
State odds very little, but electric current generation is also had at this time, in order to avoid the Ampere force as caused by short circuit current, between
Gap voltage collection circuit existing short-circuit signal enables coil current, once that is, short-circuit signal effectively closes coil electricity immediately
Stream.
Due to electric discharge force direction with molybdenum filament direction of feed on the contrary, current kinetic can be obtained according to digital control system machining locus
Direction, then as long as the direction that magnetic field generates molybdenum filament practical counteracting force is identical with the direction of motion, so as to offset Discharge Force
Influence.Actual coil axis direction (magnetic direction) may point to arbitrary angle in plane degree in the case where stepper motor, gear drive, from
And the power (left hand rule) of any direction in plane can be obtained when molybdenum filament passes through electric current.The driver of stepper motor and numerical control
System is connected, and control signal comes from digital control system, it constantly adjusts coil axis according to the direction of current machining locus
Direction makes ampere force direction consistent with molybdenum filament direction of feed always.
When left coil 1 and right coil 2 (series connection of two coils) pass to same direction current, magnetic field superposition enhances and in coil magnetic pole
Intermediate region (i.e. molybdenum filament channel 5) forms approaches uniformity magnetic field.In order to which the present apparatus is made not influence other components or not by outside
Magnetic field influences, and crust of the device surface is made shielding using the soft magnetic material of high permeability.
The present embodiment is mounted with an above structure shape respectively in the top of the lower section of upper guide 12 and lower guider 13
The automatic device for inhibiting molybdenum filament form and position of formula, it is clear that the two morpheme control devices are arranged in cut workpiece P's
Two opposite sides (both sides up and down in Fig. 2), at work the two morpheme control devices from processing sections molybdenum filament upper and lower ends actively
Two power are generated, to offset Discharge Force effect.Because cutting galvanic corrosion process is extremely complex, Mechanical Contact force method frictional dissipation
Greatly, link is more, reaction can not use at all slowly, and the present apparatus employs electromagnetic force method, and automatic synchronization, contactless offset are discharged
Power.
It refers again to shown in Fig. 2, according to work piece cut movement locus in processing, processing cut direction is calculated in real time, in processing
According to work piece cut movement locus, calculate processing cut direction in real time, by cut direction determine rotating mechanism direction of rotation and
Rotation angle (being specially direction of rotation and the angle of matrix), the size of coil current is can determine that by high frequency machined parameters, is led to
It crosses the size of current of double-polarity control D/A converter regulating winding and (if control current direction, rotating device only needs in direction
Rotate 180 degree), it is exported after high accuracy number control power constant current driving to coil, makes molybdenum filament Ampere force (counteracting force)
Direction is identical with cut direction.Obviously, this active compensation method can accurately allow Ampere force to offset work of the Discharge Force to electrode
With, so as to which influence of the form and position to machining accuracy be greatly decreased, averagely reduce more than 75% amount of deflection.Meanwhile also improve
One knife and the machining locus line registration of follow-up second knife (or multitool) processing.
Certainly, above-described embodiment is only the technical concepts and features for illustrating the application, and its object is to make people much of that
Solution present context is simultaneously implemented according to this, and the protection domain of the application can not be limited with this.It is all according to the application major technique
The equivalent transformation or modification that the Spirit Essence of scheme is done, should all cover within the protection domain of the application.
Claims (10)
1. a kind of device of automatic inhibition molybdenum filament form and position, which is characterized in that including：
Matrix with through-hole,
Left and right that is mutually fixed with described matrix and being arranged in through-hole left coil (1) arranged apart and right coil (2),
The molybdenum filament channel (5) being formed between the left coil (1) and the right coil (2),
It is the left coil (1) and the right coil (2) power supply so as to generate the coil of electromagnetic field at the molybdenum filament channel (5)
Power supply circuit and
Described matrix is driven to surround the power-equipment of the molybdenum filament channel (5) rotation.
2. the device of automatic inhibition molybdenum filament form and position according to claim 1, which is characterized in that the power-equipment is
Stepper motor (4).
3. the device of automatic inhibition molybdenum filament form and position according to claim 2, which is characterized in that the stepper motor
(4) motor driver and the coil power supply circuit is connect with the digital control system circuit of nc wire-cutting.
4. the device of automatic inhibition molybdenum filament form and position according to claim 1, which is characterized in that the left coil (1)
It is coaxially arranged with the right coil (2), and the hole of the axis of the left coil (1) and the right coil (2) and the through-hole
Axis intersects vertically.
5. the device of automatic inhibition molybdenum filament form and position according to claim 4, which is characterized in that the left coil (1)
It is arranged symmetrically centered on the axially bored line of the through-hole with the right coil (2).
6. the device of automatic inhibition molybdenum filament form and position according to claim 1, which is characterized in that described matrix includes：
Magnet ring (6),
The slip ring (3) being coaxially fixed below the magnet ring (6),
Be fixed on the slip ring (3) periphery external toothing (14) and
Two magnetic poles (7) that are mutually fixed with the magnet ring (6) and radially-inwardly stretching out；
The left coil (1) and the right coil (2) are respectively wound around on two magnetic poles (7), and the power-equipment leads to
Gear drive (15) is crossed to be sequentially connected with the external toothing (14).
7. the device of automatic inhibition molybdenum filament form and position according to claim 6, which is characterized in that further include a pedestal
(8), the slip ring (3) is slidably connected with pedestal pivot.
8. the device of automatic inhibition molybdenum filament form and position according to claim 6, which is characterized in that further include magnetic shielding cover
(9), the magnetic shielding cover (9) is by the left coil (1), the right coil (2), the magnet ring (6), the slip ring (3) and institute
Two magnetic poles (7) stated accommodate in the inner.
9. a kind of nc wire-cutting, including high-frequency line cutting power supply (10) and with high-frequency line cutting power supply (10) circuit
The digital control system of connection, molybdenum filament straight line active section (11) from the high-frequency line cutting power supply (10) to nc wire-cutting up and down
Both ends are passed through the high-frequency pulse current that flow direction is cut workpiece (p), which is characterized in that further include as any in claim 1 to 8
The described automatic device for inhibiting molybdenum filament form and position, the molybdenum filament straight line active section (11) is across molybdenum filament channel (5) cloth
It puts.
10. nc wire-cutting according to claim 9, which is characterized in that the automatic inhibition molybdenum filament form and position
There are two device is set altogether, it is arranged in the two opposite sides of the cut workpiece (p).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225239.7A CN108237276B (en) | 2018-03-19 | 2018-03-19 | Device and method for automatically inhibiting molybdenum wire shape and position change |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225239.7A CN108237276B (en) | 2018-03-19 | 2018-03-19 | Device and method for automatically inhibiting molybdenum wire shape and position change |
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| CN108237276B CN108237276B (en) | 2023-05-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109175554A (en) * | 2018-10-19 | 2019-01-11 | 崔云兰 | A kind of automotive hub, processing unit (plant) and its technique |
| CN109175557A (en) * | 2018-10-30 | 2019-01-11 | 中国工程物理研究院机械制造工艺研究所 | A kind of wire cutting wire drive device |
| CN114932278A (en) * | 2022-06-24 | 2022-08-23 | 皖西学院 | One-way wire-moving electric spark wire-electrode cutting machine tool |
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