CN1311945C - High frequency pulse laser induced electrode directional discharging apparatus for roughing roller surface - Google Patents
High frequency pulse laser induced electrode directional discharging apparatus for roughing roller surface Download PDFInfo
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- CN1311945C CN1311945C CNB2005101327651A CN200510132765A CN1311945C CN 1311945 C CN1311945 C CN 1311945C CN B2005101327651 A CNB2005101327651 A CN B2005101327651A CN 200510132765 A CN200510132765 A CN 200510132765A CN 1311945 C CN1311945 C CN 1311945C
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Abstract
The present invention discloses a texturing device using high frequency pulse laser to induce an electrode to discharge in a directional way on the surface of a roller. The present invention is characterized in that the device comprises a pulse power source, a high frequency pulse laser generator, a discharging electrode and a control device, wherein both poles of the pulse power source are respectively connected with a roller to be processed and the discharging electrode arranged in the position close to a laser focus of the laser generator; a distance is remained between the discharging electrode and the roller to be processed; the control device controls the pulse power source and the high frequency pulse laser generator to work. The device has the advantages of good directivity, high working frequency, large power and good controllability of texturing distribution and uniformity.
Description
Technical field
The present invention relates to a kind of film forming system of metal material.
Background technology
The cold-reduced sheet surface requirements of high-quality has certain roughness pattern, with processability and the coating performance of improving steel plate.Production high-quality flat cold-rolled sheet at first will carry out texturing appearance to the operation roll of mill surface, and milling train uses the texturing roll to roll out the cold rolling texturing thin plate of required roughness pattern then.At present, the texturing technology of roll comprises shot-peening texturing (SBT), electric spark texturing (EDT), laser roughening (LT) and electron beam texturing (EBT), the shot-peening texturing is with compressed air hard steel sand high velocity jet to be arrived roller surface, relies on the kinetic energy impact of steel sand to make the roller surface plastic deformation and change surface topography; The electric spark texturing be with many to electrode, breaker roll surface-discharge consolidation appearance in dielectric fluid; The laser roughening technology is divided into two kinds again, CO
2Laser roughening is to adopt the laser beam of the mechanical chopper blocking-up focusing of rotation at a high speed to form pulse laser, and the consolidation texturing is carried out on the breaker roll surface.The YAG laser roughening is to control the interior gain of laser cavity by sound-light Q-switch, realizes texturing thereby form high repeat frequency pulsed laser bundle breaker roll surface, as the patent application of the applicant proposition in 1992; The electron beam texturing is to produce electron beam with electron gun, focuses on through magnetic lenses roll surface is carried out texturing, and texturing system and roll must be processed under vacuum environment.Above roughing method is from the rough morphology of roller surface texturing, its surface topography is divided into two classes again: random distribution texturing and controlled distribution texturing, shot-peening texturing and electric spark texturing belong to uncontrollable random distribution texturing, and laser roughening and electron beam texturing belong to the controlled distribution texturing.
The random distribution texturing of roll, be to clash into roll surface repeatedly or electrode is formed to the consolidation of roll surface multiple discharge in medium oil repeatedly by many by high velocity jet sand ball, because the texturing process is uncontrollable, the effect strengthening point of roll surface often has overlapping, and the roughness uniformity is relatively poor, and has a large amount of minute grooves that are communicated with between the strengthening point, be unfavorable for the storage of lubricating oil under the force-bearing situation, liquid, when plate forming, be unfavorable for that material deformation flows, and has influenced deep drawability to a certain extent.
Adopt the controlled texturing on laser beam and electron beam breaker roll surface, because the electron beam in laser and the vacuum all is straightline propagation, directionality is splendid, under computer control, the active position of each texturing point on roll surface can accurately be controlled, so the good uniformity of texturing roughness.Simultaneously, texturing point exists for uniform isolated little hole, and lubricated difficult loss of each little hole oil storage can effectively be reduced coefficient of friction when sheet material forming, improve deep-draw and coating performance.Therefore when Development and Production high-quality cold-rolled thin sheet paper tinsel, controlled distribution texturing technology more and more demonstrates advantage.But the controlled distribution texturing all is to adopt single beam (or electron beam) texturing, and its texturing speed is not so good as the shot-peening texturing and electric spark texturing (often adopting many to electrode discharge) is fast.Necessary sound-light the Q-switch of particularly solid-state YAG laser roughening modulation high repetition frequency is limited by driving power, and difficulty further improves the laser roughening laser power, to satisfy the more needs of high speed texturing and high roughness texturing of roll.
Summary of the invention
The object of the present invention is to provide the texturing device of the roller surface high recurrent frequency pulse laser induction electrode directional discharge that a kind of speed is fast, directive property good, operating frequency is high, power is big, the uniformity controllability of texturing distribution is good.
For achieving the above object, technical solution of the present invention is:
A kind of texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge, this device comprises the pulse power, high recurrent frequency pulse laser generator, sparking electrode, control device, the two poles of the earth of the described pulse power connect described roll to be processed and sparking electrode respectively, described sparking electrode is arranged at the laser spot place near described laser generator, and leave spacing between described sparking electrode and the roll to be processed, described control device is controlled the work of the described pulse power and described high recurrent frequency pulse laser generator.
Further, described high recurrent frequency pulse laser generator comprises acousto-optic drive power, laser instrument, speculum, the condenser lens that connects successively, and described acousto-optic drive power is connected with described control device.
Further, described laser instrument is the YAG laser instrument of sound-optical accent Q.
Further, the described pulse power is for discharging and recharging power supply, and this discharges and recharges electric power loop is that a high tension loop and a low tension loop are formed in parallel.
Further, described pulse power negative pole connects described sparking electrode, the described roll to be processed of anodal connection.
Further, described sparking electrode is a needle electrode.
Further, described sparking electrode is a rotation electrode, and this rotation electrode comprises disk electrode and the drive unit that is connected with disk electrode, and described disk electrode arc edge section is an angular shape.
Further, described wedge angle is the 20-30 degree.
Further, be coated with the optical coating that can make visible light transmissive on the described speculum, be provided with camera below described speculum, this camera connects described control device.
Further, this device also comprises the roll clamping device, this roll clamping device comprises rotating shaft, guide rail, slide carriage, rotating shaft is fixed in guide rail one end, slide carriage is complementary with guide rail and can slides by relative guide rail, described speculum, condenser lens, sparking electrode all are fixed on the slide carriage, and roll to be processed is fixed on the rotating shaft.
After adopting said structure, because this roller surface texturing device comprises the pulse power, high recurrent frequency pulse laser generating means, sparking electrode and control device, control device control under, the pulse laser beam of pulse laser generating means output focuses on the roll surface of roll to be processed, make and produce plasma plume on the roll surface, the induced discharge electrode discharges to roller surface to be processed, forms the consolidation spot.The directive property that the present invention has kept laser is good, texturing distribution and the uniformity controllability is good, operating frequency is high, the advantage that can improve as required with the discharge power of discharge power supply, therefore this device has reached the effect that texturing power is big, frequency is high, overcome simultaneously the problem of poor controllability again, and simple YAG laser roughening energy conversion efficiency is low, power is difficult to shortcomings such as raising.Experiment shows that roll surface roughness Ra is difficult to reach 5.0 μ m after independent laser roughening, the electric spark texturing, and high repetition YAG induced with laser directional discharge roughing method of the present invention can make roll surface texturing roughness Ra controlled at 1.5-14.0 μ m on a large scale.In addition, include speculum in the described high recurrent frequency pulse laser generator, below speculum, be provided with the CCD camera, the CCD camera connects control device, therefore the CCD camera is with the image input computer of the roller surface that collects, but the shape characteristic on breaker roll surface shows observation, also can be used for simultaneously observing regulating the position of condenser lens with respect to the roll roll surface, makes whole texturing process more controlled; After sparking electrode adopts rotation electrode, in the high recurrent frequency pulse laser induction discharge process, because the not stall of disk is moving, each discharge process is on the difference of disk border, this has just reduced the overheated ablation phenomen of the eletrode tip that continuous discharge causes greatly, in addition, replace the tip of needle electrode with the circumference of disk, electrode discharge o'clock is expanded on the whole circumference line by a point, be equivalent to increase number of electrodes, reduced the heat accumulative total on the electrode, simultaneously, because disk thermal capacity is big, the rotation of disk makes heat radiation accelerate again, thereby significantly improve the service life of discharge electrode, make roller texturing more even.In addition, discharging and recharging electric power loop is that a high tension loop and a low tension loop are formed in parallel, and high tension loop has guaranteed that two inter-electrode voltages are enough high, and induced discharge punctures, and low tension loop then provides and punctures the required big electric current in back.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the circuit structure diagram of the pulse power of the present invention;
The design sketch of the consolidation spot that Fig. 3 A obtains during for positive discharge;
The design sketch of the consolidation spot that Fig. 3 B obtains during for negative discharge;
Fig. 4 A is the roll surface figure that simple YAG laser roughening obtains under the atmospheric environment;
Fig. 4 B is the roll surface figure that texturing of the present invention obtains under the atmospheric environment;
Fig. 5 is the structural representation of rotation electrode.
The specific embodiment:
As shown in Figure 1, a kind of texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge, this device comprise the pulse power 1, high recurrent frequency pulse laser generator 2, sparking electrode 3, control device 4 and roll to be processed 5, roll clamping device 6;
The pulse power 1 is the fast charging and discharging power supply, negative pole connects sparking electrode 3, anodal connection roll 5 to be processed, leave the spacing that is not more than 1mm between sparking electrode 3 and the roll to be processed 5, be full of air in this spacing, breakdown voltage between sparking electrode 3 and the roll to be processed 5 is more than 3000 volts, and the pulse voltage across poles of the pulse power 1 is up to 500 volts, thereby guarantees not disruptive discharge automatically between sparking electrode 3 and the roll to be processed 5.Described sparking electrode 3 is a needle electrode.
The pulse power 1 is the fast charging and discharging power supply, its circuit structure as shown in Figure 2, for guaranteeing the reliable induced discharge of laser energy under high repetition working condition, this discharges and recharges electric power loop is that a high tension loop and a low tension loop are formed in parallel, the effect of high tension loop is easily to make induced discharge puncture between two electrodes, low tension loop then provides and punctures the required big electric current in back, among Fig. 2, m, n is an input behind the two-phase power supply lower pressure rectifier, input voltage is the 100-500 volt, p, q is an input behind the two-phase electricity high-voltage rectifying, input voltage is the 300-1000 volt, C1, IGBT1, R1 connects mutually and constitutes the low pressure charge circuit to capacitor C 2 chargings, and C2 passes through IGBT2, under the induced with laser situation, through sparking electrode to roll 5 surface-discharges to be processed.C4, IGBT4, R2 connect mutually and constitute the high-voltage charging loop to capacitor C 3 chargings, and C3, discharges to roller surface to be processed through sparking electrode under the induced with laser situation by IGBT3.D3 is an isolating diode, and D1 is a fly-wheel diode, and R1 is a current-limiting resistance.Control module IGBT1, IGBT2, IGBT3, IGBT4 connect control device 4 respectively, trigger open-minded by control device 4 controls, service time has determined that the discharge pulse width can be adjustable in 10 microseconds-1 millisecond scope, since IGBT can 20KHZ frequency to capacitor C 2, C3 charging, therefore can satisfy the high repetition frequency job requirement.
High recurrent frequency pulse laser generator 2 comprises the acousto-optic drive power 21 that connects successively, YAG laser instrument 22, speculum 23, the condenser lens 24 of sound-optical accent Q; Sparking electrode 3 is located at the place, focal position near condenser lens 24.
In the present embodiment, control device 4 adopts computer, and an end of computer connects acousto-optic drive power 21, YAG laser instrument 22 successively, under computer control, acousto-optic drive power 21 makes laser instrument 22 send the high repetition frequency laser pulse for the acoustooptic switch of 22 li in laser instrument provides switching signal; The output downstream of laser instrument 22 is provided with speculum 23, condenser lens 24 successively, speculum 23 is a completely reflecting mirror, the pulse laser beam of the wavelength 1.06 μ m of laser instrument 4 outputs is after completely reflecting mirror 23 reflections, focus on by condenser lens 24 on the roll surface of roll 5 to be processed, make illuminated position generation plasma plume 7 on the roll surface, plasma plume 7 plays the effect of induced discharge switch; In addition, also be coated with optical coating on the speculum 23, can make the light transmission of visible wavelength, below speculum 23, be provided with CCD camera 8, CCD camera 8 connects computer, therefore CCD camera 8 is the image input computer of the roller surface that collects, but the shape characteristic on breaker roll surface shows observation, also can be used for simultaneously observing regulating the position of condenser lens 24 with respect to the roll roll surface; The other end of computer connects the pulse power 1, the fast charging and discharging process of control power supply 1;
After thousands of times of the sparking electrode discharge, eletrode tip will be because of the overheated serious distortion of ablating, so that can't carry out laser induced discharge effectively, for avoiding this situation, sparking electrode 3 adopts rotation electrode as shown in Figure 5, comprise disk electrode 31, rotating shaft 32, motor 34, described disk electrode 31 is the disk of the about 100-160mm of a diameter, thick 5-10mm, and disk electrode arc edge section is the angular shape of 20-30 degree.Described disk electrode 31 is processed by the conductive metallic material of steel, copper and alloy thereof or other anti-ablation, the center drilling of disk electrode 31, be installed on the rotating shaft 32 by this hole, closely cooperate with rotating shaft 32, rotating shaft 32 is made by conductive metallic material, one end is equipped with trough belt wheel 35, disk electrode 31, rotating shaft 32, motor 34, belt pulley 35 are installed on the support 36 that insulating materials makes by bearing, motor 34 drives disk electrode 31 rotations by the driving belt on the belt pulley 35 37, and the rotating speed of disk electrode 31 can be regulated and control by power supply; The other end of rotating shaft 32 connects a brush plate 38, brush plate 38 is installed on the support 6, brush plate 38 is used for being connected with the pulse power 1, brush plate 38, rotating shaft 32, disk electrode 31 are formed the output stage that conductive channel connects the pulse power 1, and another output stage of the pulse power 1 connects roll 5 to be processed, keeps minim gap between the edge of disk electrode 31 and the roll to be processed 5.
In addition, rotating shaft 32 also can connect motor 34 by other transmission device, drives disk electrode 31 rotations by motor 34.
When under atmospheric environment, discharging between sparking electrode and the roller surface, prolongation along with the discharge current pulse width, the discharge channel diameter will expand owing to fuel factor, cause roller surface consolidation spot diameter to become big, the smoothness variation of profile, for reducing this influence, in apparatus of the present invention, adopt negative discharge, even sparking electrode 3 connects the negative pole of the pulse power 1, roll 5 to be processed connects positive source, the design sketch of the consolidation spot that Fig. 3 A obtains when being depicted as positive discharge, the design sketch of the consolidation spot that Fig. 3 B obtains when being depicted as negative discharge.
Fig. 4 A, 4B have shown respectively under atmospheric environment, the roll surface figure that simple YAG laser roughening and the texturing of the high repetition YAG of the present invention induced with laser directional discharge obtain.Under same laser parameter condition, the surface roughness Ra=2.0 μ m of simple laser roughening, and the surface roughness Ra=10 μ m of high Repetition Frequency Laser induced orientation discharge texturing.
Technologies such as said apparatus not only can be used for the roller surface texturing, is applied to iron and steel, nonferrous metallurgy flat cold-rolled sheet, also can be applicable to condition of work abominable hot roll surface texturing, reinforcement, also can be used in group's hole processing, welding, heat treatment or other process for treating surface of metal.
Claims (10)
1, a kind of texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge, it is characterized in that: this device comprises the pulse power, high recurrent frequency pulse laser generator, sparking electrode, control device, the two poles of the earth of the described pulse power connect described roll to be processed and sparking electrode respectively, described sparking electrode is arranged at the laser spot place near described laser generator, and leave spacing between described sparking electrode and the roll to be processed, described control device is controlled the work of the described pulse power and described high recurrent frequency pulse laser generator.
2, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 1, it is characterized in that: described high recurrent frequency pulse laser generator comprises acousto-optic drive power, laser instrument, speculum, the condenser lens that connects successively, and described acousto-optic drive power is connected with described control device.
3, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 2 is characterized in that: described laser instrument is the YAG laser instrument of sound-optical accent Q.
4, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 1 is characterized in that: the described pulse power is for discharging and recharging power supply, and this discharges and recharges electric power loop is that a high tension loop and a low tension loop are formed in parallel.
5, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 1 is characterized in that: described pulse power negative pole connects described sparking electrode, the described roll to be processed of anodal connection.
6, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 1 is characterized in that: described sparking electrode is a needle electrode.
7, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 1, it is characterized in that: described sparking electrode is a rotation electrode, this rotation electrode comprises disk electrode and the drive unit that is connected with disk electrode, and described disk electrode arc edge section is an angular shape.
8, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 7 is characterized in that: described wedge angle is the 20-30 degree.
9, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 2, it is characterized in that: be coated with the optical coating that can make visible light transmissive on the described speculum, be provided with camera below described speculum, this camera connects described control device.
10, the texturing device of roller surface high recurrent frequency pulse laser induction electrode directional discharge as claimed in claim 2, it is characterized in that: this device also comprises the roll clamping device, this roll clamping device comprises rotating shaft, guide rail, slide carriage, rotating shaft is fixed in guide rail one end, slide carriage is complementary with guide rail and can slides by relative guide rail, described speculum, condenser lens, sparking electrode all are fixed on the slide carriage, and roll to be processed is fixed on the rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101327651A CN1311945C (en) | 2005-12-26 | 2005-12-26 | High frequency pulse laser induced electrode directional discharging apparatus for roughing roller surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101327651A CN1311945C (en) | 2005-12-26 | 2005-12-26 | High frequency pulse laser induced electrode directional discharging apparatus for roughing roller surface |
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| CN1789439A CN1789439A (en) | 2006-06-21 |
| CN1311945C true CN1311945C (en) | 2007-04-25 |
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| CNB2005101327651A Expired - Fee Related CN1311945C (en) | 2005-12-26 | 2005-12-26 | High frequency pulse laser induced electrode directional discharging apparatus for roughing roller surface |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2462419A (en) * | 2008-08-04 | 2010-02-10 | Sarclad Ltd | Method and apparatus for improving roll texturing using electrical discharge machining |
| CN101966626A (en) * | 2010-09-01 | 2011-02-09 | 王荫森 | Electric spray machine for roughening grinding roller |
| CN102035126A (en) * | 2010-11-10 | 2011-04-27 | 中国科学院力学研究所 | All-solid-state laser for laser texturing of metal |
| CN103419137B (en) * | 2012-05-25 | 2015-10-28 | 宝山钢铁股份有限公司 | A kind of roller surface hardening and roughness control method |
| CN103192147B (en) * | 2013-03-22 | 2015-08-19 | 中国科学院力学研究所 | The pulse micro arc discharge method of mobile laser spot induction |
| CN104625255B (en) * | 2014-12-12 | 2017-04-19 | 武汉宝德机电股份有限公司 | All-digital control steel roller electric spark texturing test method and device |
| CN108927595B (en) * | 2017-05-24 | 2020-09-25 | 宝山钢铁股份有限公司 | Grinding and electrocautery processing system for wire cutting electrode wheel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2209008Y (en) * | 1994-09-10 | 1995-10-04 | 中国科学院力学研究所 | Laser working equipment for roller surface roughening |
| CN2413812Y (en) * | 1999-12-27 | 2001-01-10 | 林子光 | Laser roughened fishnet roller |
| CN1357427A (en) * | 2000-12-13 | 2002-07-10 | 中国科学院力学研究所 | Roller surface roughening laser processing system to form controllable distributed roughened spots |
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2005
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Patent Citations (3)
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|---|---|---|---|---|
| CN2209008Y (en) * | 1994-09-10 | 1995-10-04 | 中国科学院力学研究所 | Laser working equipment for roller surface roughening |
| CN2413812Y (en) * | 1999-12-27 | 2001-01-10 | 林子光 | Laser roughened fishnet roller |
| CN1357427A (en) * | 2000-12-13 | 2002-07-10 | 中国科学院力学研究所 | Roller surface roughening laser processing system to form controllable distributed roughened spots |
Non-Patent Citations (3)
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| 激光诱导放电加工中的延时放电现象实验研究 王之桐等，激光杂志，第23卷第2期 2002 * |
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