CN105562933A - Control system and method for improving circumference irregular texturing micro-pit uniformity - Google Patents
Control system and method for improving circumference irregular texturing micro-pit uniformity Download PDFInfo
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- CN105562933A CN105562933A CN201610095086.XA CN201610095086A CN105562933A CN 105562933 A CN105562933 A CN 105562933A CN 201610095086 A CN201610095086 A CN 201610095086A CN 105562933 A CN105562933 A CN 105562933A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/3568—Modifying rugosity
- B23K26/3584—Increasing rugosity, e.g. roughening
Abstract
The invention discloses a control system for improving circumference irregular texturing micro-pit uniformity. The excitation time of pulse lasers of the control system is the same, the releasing time is variable, the effective parts of power wave shapes of the control system are basically identical, and therefore the circumference irregular texturing micro-pit uniformity is improved, and the quality of a laser texturing plate can be improved. The control system comprises an industrial personal computer, a controllable distribution connector card, an AT bus, a double-line isolation D/A card, an incremental encoder, a frequency converter , a spindle motor, a longitudinal servo driver, a transverse servo driver, a longitudinal servo motor, a transverse servo motor, a laser power source, a laser device, an acousto-optical power source, an acousto-optic switch, a pseudo-random time delay device, a pulse width setting device and a 485 bus. The invention further provides a control method.
Description
Technical field
The invention belongs to the technical field of cold roll laser texturing and discrete laser processing, relate to a kind of control system improving the random texturing of circumference micro-hole uniformity particularly, and control method.
Background technology
Cold-reduced sheet has thickness and the advantage such as plate shape precision is high, surface quality good, mechanical property good, thickness is thinner, applies very wide.Texturing plate adopts Texturing Surface of Roll smooth, and surface topography is by Texturing Surface of Roll copying surface.Texturing plate, because having better percentage elongation and coated layer adhesion, has extensive use in industries such as automobile, high ferro, Aero-Space, household electrical appliance and packagings for foodstuff.
Roller texturing technology carries out texturing to polishing roll exactly, makes its surface have the technology of special appearance.The roller texturing technology industrially obtaining large-scale promotion application is at present shot-peening texturing, electric spark texturing and laser roughening, and wherein more advanced is electric spark texturing and laser roughening.
Laser roughening is divided into CO by the laser instrument kind used
2laser roughening and YAG laser roughening.YAG laser roughening exports the YAG pulse laser of high-energy-density, high repetition frequency through Q-switch particular modulation by continuous LD pumped YAG lasers, by along roll mandrel at the uniform velocity moving focus lamp by pulse laser focusing to the roller surface at the uniform velocity rotated, roller surface is melted, gasifies, produce a large amount of molten baths; The assist gas of certain ingredients, certain pressure, along certain angle side-blowing bath, makes molten bath boss obvious; Roll self conduction of heat makes molten bath cool and Surface hardened layer rapidly because of fused mass; Thus form certain pattern at whole roll surface have the micro-hole of the sclerosis of boss in a large number.
YAG laser roughening technology is that Inst. of Mechanics, CAS researchs and develops, as patent of invention " high frequency modulation multy-pulse YAG laser engraving design system and processing method " (ZL92113223.9) in the nineties.In order to increase each to the uniformity of micro-hole distribution, regulate each to percentage elongation of cold-reduced sheet, Chinese Academy of Sciences's mechanics develop the two-dimentional controlled distribution technology of YAG laser roughening, as patent of invention " has the surface of roller texturing laser-processing system of controlled distribution texturing point " (ZL00128273.5).In order to improve the presentation quality of laser roughening plate, controlled random distribution technique is developed, as patent of invention " the surface of roller texturing laser-processing system of the random texturing point of circumference and method " (ZL200510117158.8) in the basis of Chinese Academy of Sciences's mechanics place two dimension controlled distribution technology.
The laser roughening plate of high-quality, except requiring the random distribution in micro-hole, also requires micro-hole uniformity.Patent of invention " the surface of roller texturing laser-processing system of circumference random texturing point and method " (ZL200510117158.8) produces random time delay by laser output signal within the scope of official hour, makes the micro-hole of texturing form random distribution at the circumferencial direction of roller class surface of the work.The frequency that its principle determines laser output signal can change within the specific limits.
Existing YAG laser roughening technology, in order to improve process velocity, the frequency of laser output signal is all higher, is generally greater than 10kHz, and the actuation duration of pulse laser does not reach saturation time.The energy of pulse laser depends on the actuation duration, i.e. the time in pulse spacing.The time of pulse laser release is fixing, therefore the change of laser output signal frequency will cause the inconsistent of the uneven of pulsed laser energy and waveform, thus causes the inconsistent of micro-hole, have impact on the quality of laser roughening plate.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of control system improving the random texturing of circumference micro-hole uniformity is provided, the actuation duration of its pulse laser is equal, release time is variable, make its power waveform live part basically identical, thus improve the uniformity in the micro-hole of the random texturing of circumference, therefore, it is possible to improve the quality of laser roughening plate.
Technical solution of the present invention is: the control system of the random texturing of this raising circumference micro-hole uniformity, and it comprises industrial computer, controlled distribution interface card, AT-bus, dual path isolation D/A card, incremental encoder, frequency converter, spindle motor, longitudinal direction and horizontal servo-driver, longitudinal direction and horizontal servomotor, Laser Power Devices, laser instrument, acousto-optic power supply, acoustooptic switch, pseudorandom time-delay mechanism, pulse width set device, 485 buses;
Industrial computer, connects controlled distribution interface card and dual path isolation D/A card respectively by AT-bus;
Outputting multiplex signals after the signal of controlled distribution interface card to the incremental encoder of reflection roller circumferential position carries out scaling down processing: wherein a road signal is controlled distribution signal, pseudorandom time delayed signal is exported through pseudorandom time-delay mechanism, the signal that pulse width setting device output pulse width presets exports corresponding radiofrequency signal to control acousto-optic power supply, then the acoustooptic switch in laser instrument produces pulse laser; Wherein two paths of signals is pulse signal, controls the servomotor motion of vertical and horizontal respectively through servo-driver; Other multiple signals are switching signal, control spindle motor, longitudinal direction and the start and stop of horizontal servomotor and the switch of laser instrument by frequency converter, servo-driver, Laser Power Devices;
Dual path isolation D/A card exports two-way analog quantity, controls the rotating speed of spindle motor and the power of laser instrument respectively;
Industrial computer sets the running parameter of pseudorandom time-delay mechanisms and pulse width set device by 485 buses.
The present invention, after pseudorandom time-delay mechanism, connects pulse width set device, and the pulsewidth of its output signal can set; And acousto-optic power supply is operated in external control mode, radio frequency output time is by the pulse-width controlled of pulse width set device output signal; Therefore the actuation duration of pulse laser is equal, and release time is variable, makes its power waveform live part basically identical, thus improves the uniformity in the micro-hole of the random texturing of circumference, thus can improve the quality of laser roughening plate.
Additionally provide the control method of the control system of the random texturing of this raising circumference micro-hole uniformity, it comprises the following steps:
(1) by connecting pulse width set device after pseudorandom time-delay mechanism, the pulsewidth of output signal can be set;
(2) by acousto-optic power supply is arranged on external control mode, make radio frequency output time by pulse width control.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the random texturing control system of existing circumference;
Fig. 2 is the structured flowchart of a preferred embodiment of control system according to the random texturing of raising circumference of the present invention micro-hole uniformity;
Fig. 3 is the Laser output sequential chart of the random texturing control system of existing circumference;
Fig. 4 is the Laser output sequential chart of the control system of the random texturing of raising circumference micro-hole uniformity of Fig. 2;
Fig. 5 is the structural representation of pulse width set device according to a preferred embodiment of the present invention.
Detailed description of the invention
Compared to Figure 1, the main distinction is the increase in pulse width set device to Fig. 2, and makes acousto-optic power supply be operated in external control mode, and make radio frequency output time constant, namely the actuation duration of pulse laser is constant.
As shown in Figure 2, the control system of the random texturing of this raising circumference micro-hole uniformity, it comprises industrial computer, controlled distribution interface card, AT-bus, dual path isolation D/A card, incremental encoder, frequency converter, spindle motor, longitudinal direction and horizontal servo-driver, longitudinal direction and horizontal servomotor, Laser Power Devices, laser instrument, acousto-optic power supply, acoustooptic switch, pseudorandom time-delay mechanism, pulse width set device, 485 buses;
Industrial computer, connects controlled distribution interface card and dual path isolation D/A card respectively by AT-bus;
Outputting multiplex signals after the signal of controlled distribution interface card to the incremental encoder of reflection roller circumferential position carries out scaling down processing: wherein a road signal is controlled distribution signal, pseudorandom time delayed signal is exported through pseudorandom time-delay mechanism, the signal that pulse width setting device output pulse width presets exports corresponding radiofrequency signal to control acousto-optic power supply, then the acoustooptic switch in laser instrument produces pulse laser; Wherein two paths of signals is pulse signal, controls the servomotor motion of vertical and horizontal respectively through servo-driver; Other multiple signals are switching signal, control spindle motor, longitudinal direction and the start and stop of horizontal servomotor and the switch of laser instrument by frequency converter, servo-driver, Laser Power Devices;
Dual path isolation D/A card exports two-way analog quantity, controls the rotating speed of spindle motor and the power of laser instrument respectively;
Industrial computer sets the running parameter of pseudorandom time-delay mechanisms and pulse width set device by 485 buses.
When acousto-optic power supply exports radiofrequency signal, the loss of laser resonant cavity increases, and Q value declines, and laser generation can not be formed, without Laser output; When the radiofrequency signal that acousto-optic power supply exports disappears, laser resonator cavity loss reduces, and Q value is surged, and laser generation recovers rapidly, has high-peak power Laser output.The present invention, after pseudorandom time-delay mechanism, connects pulse width set device, and the pulsewidth of its output signal can set; And acousto-optic power supply is operated in external control mode, radio frequency output time is by the pulse-width controlled of pulse width set device output signal; Therefore the actuation duration of pulse laser is equal, and release time is variable, makes its power waveform live part basically identical, thus improves the uniformity in the micro-hole of the random texturing of circumference, thus can improve the quality of laser roughening plate.
In addition, as shown in Figure 5, described pulse width set device comprises input interface, output interface and timer, enter the input signal of input interface and be pulse signal from output interface output signal out, output signal by the edging trigger of input signal, output signal has can defeated fixed pulsewidth.
Further, described timer is made up of monostable chip, and the pulsewidth of output signal is set by potentiometer.
Or further, described timer is made up of programmable Timer chip, the pulsewidth of output signal is set by programmable Timer chip.Particularly, described pulse width set device comprises single board computer and PC/104 clocked interface card, and single board computer adopts PC/104 module.More specifically, the pulsewidth of the output signal of described pulse width set device passes to single board computer by industrial computer by 485 buses, then is realized by single board computer control timer.
Additionally provide the control method of the control system of the random texturing of this raising circumference micro-hole uniformity, it comprises the following steps:
(1) by connecting pulse width set device after pseudorandom time-delay mechanism, the pulsewidth of output signal can be set;
(2) by acousto-optic power supply is arranged on external control mode, make radio frequency output time by pulse width control.
Below provide concrete example of the present invention.
Control system provided by the invention, comprises the parts such as industrial computer, controlled distribution interface card, dual path isolation D/A card, incremental encoder, frequency converter, spindle motor, longitudinal direction and horizontal servo-driver, longitudinal direction and horizontal servomotor, Laser Power Devices, laser instrument, acousto-optic power supply harmony photoswitch.One piece of controlled distribution interface card, one piece of electric isolution two-way D/A interface card in industrial computer, AT-bus be equipped with.When spindle motor rotates together with roller, incremental encoder exports the pulse signal of reflection roller circumferential position, pulse signal passes to the controlled distribution interface card in industrial computer, the controlled distribution signal exporting a road control impuls laser as calculated after machine scaling down processing controls pseudorandom time-delay mechanism, and another road pulse signal is by servo longitudinal driver drives servo longitudinal motor.Controlled distribution signal exports pseudorandom time delayed signal through pseudorandom time-delay mechanism, and the fixing signal preset through pulsewidth setting device output pulse width controls the radiofrequency signal that acousto-optic power supply exports correspondence, then the acoustooptic switch in laser instrument produces pulse laser.Controlled distribution interface card also exports a road pulse signal, by the horizontal servomotor of horizontal servo driver drives.Controlled distribution interface card also exports one group of switching signal, controls spindle motor, longitudinal direction and the start and stop of horizontal servomotor and the switch of laser instrument by frequency converter, servo-driver, Laser Power Devices.One piece of D/A interface card in industrial computer sends out two-way analog signal to laser power supply, and a road controls the power of laser instrument, and another road is to frequency converter, and transducer drive spindle motor, rotating speed is stepless adjustable.Industrial computer sets the running parameter of pseudorandom time-delay mechanisms and width sets device by 485 buses.
The external signal of pseudorandom time-delay mechanism has three tunnels: input, output and 485 EBIs.Input signal and output signal are all pulse signals.Output signal is triggered by the rising edge of input signal, and export after random delay, the pulsewidth of output signal is fixed, and its size sets by 485 buses.
As can be seen from Figure 3, in the random texturing control system of existing circumference, the frequency of pseudorandom time-delay mechanism output signal is change, the actuation duration of radio frequency output time and corresponding light pulse is also change, and the release time of pulse laser is fixing and narrow, result causes the inconsistent of the uneven of pulsed laser energy and waveform.
As can be seen from Figure 4, in the random texturing control system of circumference provided by the invention, the output pulse width (high level) of pulse width set device is equal, and radio frequency output time is also equal, and the release time of pulse laser is variable and wider.Laser output waveform can be divided into front and back two parts.Front portion laser power is higher, and the time is shorter and relatively fixing, makes metal material produce fusing, gasification, produce micro-hole, rear portion laser power is exactly continuous power substantially, the time longer and change, its power density does not reach and makes metal material melting threshold value, on micro-this nothing of pit foundation impact.According to the feature of above Laser output waveform, and laser and the interactional characteristic of metal material, just can improve the uniformity in the micro-hole of the random texturing of circumference.Horizontal dotted line in Fig. 3, Fig. 4 laser output signal represents makes metal material melting optical power density value, i.e. threshold value.
The function of pulse width set device is exactly monostable circuit, and available monostable chip realizes, and set pulse width with potentiometer, its shortcoming cannot be set by software digital, and precision is poor.Adopt programmable timer in the embodiment of the present invention, use software set.Pulse width set device schematic diagram as shown in Figure 5.This device includes single board computer and PC/104 clocked interface card.Single board computer adopts PC/104 module, it provides the repertoire of complete PC.PC/104 clocked interface card is made up of input interface, timer and output interface.Input interface is used for the level conversion of input signal; Timer is for generation of timing, and its value passes to single board computer by industrial computer by 485 buses; Output interface is for the level conversion that outputs signal and driving.PC/104 clocked interface card is arranged on the PC/104 expansion bus of single board computer.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong to the protection domain of technical solution of the present invention.
Claims (7)
1. improve a control system for the random texturing of circumference micro-hole uniformity, it is characterized in that: it comprises industrial computer, controlled distribution interface card, AT-bus, dual path isolation D/A card, incremental encoder, frequency converter, spindle motor, longitudinal direction and horizontal servo-driver, longitudinal direction and horizontal servomotor, Laser Power Devices, laser instrument, acousto-optic power supply, acoustooptic switch, pseudorandom time-delay mechanism, pulse width set device, 485 buses;
Industrial computer, connects controlled distribution interface card and dual path isolation D/A card respectively by AT-bus;
Outputting multiplex signals after the signal of controlled distribution interface card to the incremental encoder of reflection roller circumferential position carries out scaling down processing: wherein a road signal is controlled distribution signal, pseudorandom time delayed signal is exported through pseudorandom time-delay mechanism, the signal that pulse width setting device output pulse width presets exports corresponding radiofrequency signal to control acousto-optic power supply, then the acoustooptic switch in laser instrument produces pulse laser; Wherein two paths of signals is pulse signal, controls the servomotor motion of vertical and horizontal respectively through servo-driver; Other multiple signals are switching signal, control spindle motor, longitudinal direction and the start and stop of horizontal servomotor and the switch of laser instrument by frequency converter, servo-driver, Laser Power Devices;
Dual path isolation D/A card exports two-way analog quantity, controls the rotating speed of spindle motor and the power of laser instrument respectively;
Industrial computer sets the running parameter of pseudorandom time-delay mechanisms and pulse width set device by 485 buses.
2. the control system of the random texturing of raising circumference according to claim 1 micro-hole uniformity, it is characterized in that: described pulse width set device comprises input interface, output interface and timer, enter the input signal of input interface and be pulse signal from output interface output signal out, output signal by the edging trigger of input signal, output signal has can defeated fixed pulsewidth.
3. the control system of the random texturing of raising circumference according to claim 2 micro-hole uniformity, it is characterized in that: described timer is made up of monostable chip, the pulsewidth of output signal is set by potentiometer.
4. the control system of the random texturing of raising circumference according to claim 2 micro-hole uniformity, is characterized in that: described timer is made up of programmable Timer chip, and the pulsewidth of output signal is set by programmable Timer chip.
5. the control system of the random texturing of raising circumference according to claim 4 micro-hole uniformity, is characterized in that: described pulse width set device comprises single board computer and PC/104 clocked interface card, and single board computer adopts PC/104 module.
6. the control system of the random texturing of raising circumference according to claim 5 micro-hole uniformity, it is characterized in that: the pulsewidth of the output signal of described pulse width set device passes to single board computer by industrial computer by 485 buses, then is realized by single board computer control timer.
7. a control method for the control system of the random texturing of raising circumference according to claim 1 micro-hole uniformity, is characterized in that: it comprises the following steps:
(1) by connecting pulse width set device after pseudorandom time-delay mechanism, the pulsewidth of output signal can be set;
(2) by acousto-optic power supply is arranged on external control mode, make radio frequency output time by pulse width control.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105880839A (en) * | 2016-06-23 | 2016-08-24 | 华中科技大学 | Random control method for laser frequency energy of fiber laser for roll roughening |
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