CN115533345B - Laser cutting system - Google Patents

Laser cutting system Download PDF

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Publication number
CN115533345B
CN115533345B CN202211483173.4A CN202211483173A CN115533345B CN 115533345 B CN115533345 B CN 115533345B CN 202211483173 A CN202211483173 A CN 202211483173A CN 115533345 B CN115533345 B CN 115533345B
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laser
current
controller
modulation
cutting system
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CN115533345A (en
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牛满钝
林高令
朱熙彬
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Jinan Bodor Laser Co Ltd
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Jinan Bodor Laser Co Ltd
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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
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • 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
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/0014—Monitoring arrangements not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Lasers (AREA)

Abstract

The invention relates to a laser cutting system, which belongs to the technical field of laser cutting, and comprises a laser, wherein the laser comprises a controller and a pumping source; the controller is used for controlling a driving circuit in the laser to continuously input threshold current to the pumping source when the laser is started until the laser is closed; the laser cutting system further comprises an industrial personal computer, wherein the industrial personal computer is used for sending a first control signal to the controller under the condition that the working mode of the laser is a continuous laser mode; the controller is specifically used for controlling a driving circuit inside the laser to input pulse modulation current to the pumping source at a preset first period based on the first control signal; and the pumping source is used for outputting pumping laser based on the threshold current and the pulse modulation current. By means of the technical scheme, the light-emitting speed of the pump source can be improved, and the distortion degree of the waveform can be reduced.

Description

Laser cutting system
Technical Field
The invention relates to the technical field of laser cutting, in particular to a laser cutting system.
Background
Currently, the high-power fiber laser is mainly divided into the following two modes in use: one mode is a Continuous laser (CW) mode, that is, the laser power is kept constant when a plate is processed, and the laser output power value can only be in a low-speed on or off mode; the other is a Quasi-continuous laser (QCW) mode, in which the laser power is output while maintaining a high frequency (usually in the order of khz) and a tunable duty cycle during the processing of the plate.
With the continuous improvement of the industry on the laser process requirements, the setting requirements on the frequency value and the duty ratio of the laser in the QCW mode are higher, but in practical application, the opening time of devices such as a pumping source, a field effect transistor (namely an MOS (metal oxide semiconductor) transistor and the like has certain delay and certain rising and falling time. For example, for an existing pump source, the current rises from 0A to 10A, and also falls from 10A to 0A.
However, since the frequency of the laser is relatively high (e.g., 50Khz, etc.) in the QCW mode, the actual optical power waveform of the laser may become trapezoidal or triangular, and a large range of current variation may have a certain impact on the entire laser driving part, the pump source device, and the optical device, thereby reducing the actual processability and lifetime of the laser.
Disclosure of Invention
Technical problem to be solved
In view of the above-mentioned drawbacks and deficiencies of the prior art, the present invention provides a laser cutting system to increase the light-emitting speed of a pump source and reduce the distortion of the waveform.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the embodiment of the invention provides a laser cutting system, which comprises a laser, wherein the laser comprises a controller and a pumping source; the controller is used for controlling a driving circuit inside the laser to continuously input the threshold current to the pumping source when the laser is started, and stopping inputting the threshold current until the laser is closed.
Therefore, in the embodiment of the application, when the laser is turned on, the driving circuit inside the laser is controlled to continuously input the threshold current to the pumping source until the laser is turned off, and the threshold current is stopped being input, so that the current of the laser can rise from the threshold current and fall to the threshold current.
In some possible embodiments, the laser cutting system further comprises an industrial personal computer, wherein the industrial personal computer is used for sending a first control signal to the controller under the condition that the working mode of the laser is the working mode of continuous laser; the controller is specifically used for controlling a driving circuit inside the laser to input pulse modulation current to the pumping source at a preset first period based on a first control signal; and the pumping source is used for outputting pumping laser based on the threshold current and the pulse modulation current.
In some possible embodiments, the pulse modulation current is determined based on the rated power of the laser.
In some possible embodiments, the laser cutting system further comprises an industrial personal computer, wherein the industrial personal computer is used for sending a second control signal to the controller under the condition that the working mode of the laser is the working mode of the quasi-continuous laser; the controller is specifically used for controlling the driving circuit inside the laser to input pulse modulation current to the pump source in a preset second period and controlling the driving circuit inside the laser to input impact modulation current to the pump source in a specified second period in a plurality of second periods based on the second control signal; and the pumping source is used for outputting pumping laser based on the threshold current, the pulse modulation current and the impact modulation current.
In some possible embodiments, the pulse modulation current is determined based on a rated power of the laser, and the impact modulation current is determined based on a peak power of the laser and the rated power of the laser.
In some possible embodiments, the current range of the threshold current is 1 to 2A.
In some possible embodiments, the laser cutting system further comprises an optical sensor for detecting the light-emitting state of the pump source; the controller is specifically used for acquiring a real-time current value obtained by converting a light intensity value acquired by the light sensor, judging whether the real-time current value is less than or equal to a current threshold value, and performing alarm processing if the real-time current value is less than or equal to the current threshold value; wherein the current threshold is determined based on the threshold current.
In some possible embodiments, the laser cutting system further comprises a temperature sensor for detecting a temperature of a driving circuit inside the laser; and the controller is specifically used for acquiring the circuit temperature acquired by the temperature sensor, judging whether the circuit temperature is greater than or equal to a preset temperature or not, and if the circuit temperature is greater than or equal to the preset temperature, performing alarm processing.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram illustrating a laser cutting system provided by an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a power timing and stacking relationship provided by an embodiment of the present application;
FIG. 3A is a schematic diagram of an impact modulated pulse signal provided by an embodiment of the present application;
FIG. 3B is a schematic diagram of another impact modulated pulse signal provided by an embodiment of the present application;
FIG. 4A is a schematic diagram illustrating a shock modulated pulse signal for cutting thick carbon steel according to an embodiment of the present application;
fig. 4B to 4C are schematic diagrams illustrating impact modulation pulse signals for cutting nonferrous metals according to an embodiment of the present application.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
According to the laser cutting system provided by the embodiment of the invention, the power control of the pumping source is divided into the following three parts, wherein the first part is the pumping source threshold power output source W 1 The second part is a pump source pulse modulation output source W 2 And the third part is an impact modulation output source W 3 So that the laser obtains the total power W by pumping in the CW working mode CW =W 1 +W 2 And the total power W obtained by pumping the laser in QCW mode QCW =W 1 +W 2 +W 3 。
That is, the input current of the pump source can be divided into three portions, the first portion is the output source W with the threshold power of the pump source 1 Corresponding threshold current I 1 The second part is pulse-modulated with the pump source to output source W 2 Corresponding pulse modulated current I 2 And the third part is connected with an impact modulation output source W 3 Corresponding impact modulation current I 3 So that the laser is pumped in the CW mode of operation with the resulting total current I CW =I 1 +I 2 And the total power I obtained by pumping the laser in QCW mode QCW =I 1 +I 2 +I 3 。
Therefore, in the embodiment of the application, when the laser is turned on, the driving circuit inside the laser is controlled to continuously input the threshold current to the pumping source until the laser is turned off, and the threshold current is stopped being input, so that the current of the laser can rise from the threshold current and fall to the threshold current.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
To facilitate understanding of the embodiments of the present application, some terms referred to in the embodiments of the present application are explained below:
"CW": it refers to a continuous laser, a wave that a laser outputs in a continuous manner rather than a pulsed manner.
"QCW": the QCW laser is quasi-continuous laser, stable in output energy of QCW laser, high in beam quality, flexible in process and widely applied to precision welding in industries such as 3C and the like, and has output in pulse and CW modes.
"pump source threshold power": it refers to the critical point when the pump source is at effective light emission (i.e. the pump light is weak and cannot be processed and detected, but can be detected by a highly sensitive PD photoelectric sensor). The threshold current of the critical point may be in a range of 1 to 2A.
That is to say, the threshold current may be a critical current value, and at this time, the optical sensor may detect the light intensity value output by the threshold current, but since the power is small at this time, the device and the personnel cannot be damaged at the same time of the production and the processing.
"pulse modulation output": and the rated power of the output of the pump source controls the source, and the rated power determines whether the pump source can carry out effective power output at rated power.
"shock modulation output": the power source is used for instantaneous output in the QCW mode, so that the pump source can reach a peak state in a short time.
Referring to fig. 1, fig. 1 shows a schematic diagram of a laser cutting system according to an embodiment of the present disclosure. As shown in FIG. 1, the laser cutting system comprises an industrial personal computer and a laser which is in communication connection with the industrial personal computer. The laser comprises a controller, a first driving circuit, a second driving circuit, a third driving circuit, a pumping source and an optical sensor, the controller can be in communication connection with an industrial personal computer, the controller can also be respectively connected with the first driving circuit, the second driving circuit and the third driving circuit, the pumping source can also be respectively connected with the first driving circuit, the second driving circuit and the third driving circuit, the optical sensor can be arranged at the interface of the laser and the optical fiber (or the optical sensor can be positioned at the light-emitting rear end of the pumping source), the optical sensor can acquire the light intensity value at the interface of the laser and the optical fiber, and namely the light-emitting state of the pumping source can be acquired by the optical sensor.
It should be understood that the specific device of the industrial personal computer, the specific device of the controller, the specific circuit of the first driving circuit, the specific circuit of the second driving circuit, the specific circuit of the third driving circuit, the specific device of the pumping source, the specific sensor of the optical sensor, and the like may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the first driving circuit, the second driving circuit and the third driving circuit may be existing driving circuits as long as it is ensured that they can output corresponding currents based on the input signal of the controller.
In order to facilitate an understanding of the practice of the present application, specific examples are described below.
Specifically, when the laser is turned on (or after the laser is turned on and enabled), the controller may control a first driving circuit inside the laser to continuously input the threshold current to the pump source, and stop inputting the threshold current until the laser is turned off.
In addition, in the process of continuously inputting the threshold current to the pumping source (including the processing process of the plate), the light intensity value at the interface between the laser and the optical fiber can be continuously collected through the optical sensor, then the light intensity value can be converted into a real-time current value, and then the real-time current value can be compared with the set current threshold value through the current comparator. The current threshold corresponds to a value when the pump source current is a threshold current (or, the current threshold is a threshold current value). If the real-time current value is smaller than or equal to the current threshold value, the fact that the light path part or the electric part inside the laser is damaged at the moment can be determined, so that the alarm can be given immediately, and further the operating personnel and the laser are effectively protected. And compared with the existing scheme of protecting and stopping the damage after the laser burns out, the method can avoid related risks before hidden dangers occur.
It should be understood that the specific value of the threshold current may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the threshold power can be generally determined according to the inherent characteristics of the pump source and the loss of the optical path, so the current range of the threshold current is generally 1 to 2a.
In addition, after the laser is turned on and before the plate is machined based on a control signal (for example, before a first control signal or a second control signal) sent by an industrial personal computer, the controller can input a preset power debugging current to the pump source, so that the pump source can output pump laser based on the sum of the power debugging current and a threshold current, so that a plurality of light intensity values of the laser and the optical fiber interface at different moments can be collected through the optical sensor, an average light intensity value of the plurality of light intensity values can be calculated, any one of the plurality of light intensity values is selected as a reference light intensity value, a light intensity difference value of the average value of the reference intensity value and the light intensity value can be calculated, the light intensity difference value can be processed by a preset method (for example, a PID digital control algorithm), a current adjustment value is obtained, the sum of the pulse adjustment current and the current adjustment value can be used as an updated pulse adjustment current after the subsequent controller obtains the pulse modulation current based on the control signal sent by the industrial personal computer, the sum of the pulse adjustment current and the current adjustment value can be used as an updated pulse adjustment current adjustment, so that the laser output laser cannot achieve the expected effect caused by the situation of the laser before the machining process, and the laser can be automatically estimated by a user, and the laser can be further, which is not based on the user experience of the laser. The specific value of the power adjustment current may also be set according to actual requirements, and the embodiment of the present application is not limited to this.
And when the laser works in a CW mode, the industrial personal computer can send a first control signal to the controller, the controller can control a second driving circuit in the laser to input pulse modulation current to the pumping source in a preset first period based on the first control signal, and the pumping source does not need to distinguish the two paths of current.
It should be understood that the specific period of the first period, the specific value of the pulse modulation current, and the like can be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, embodiments of the application may determine a rated power of the laser, and may calculate a first power difference between the rated power and a threshold power of the pump source, and may determine a specific value of the pulse modulation current based on the first power difference. That is, the pulse modulation current is determined based on the rated power of the laser.
Therefore, the pulse modulation output can be controlled by the industrial personal computer in real time and responds to the power output signal in real time, and the pulse modulation output has the advantages of being output based on the effective emergent light power critical point of the pumping source, so that the power output speed of the pumping source can be greatly improved, the relatively continuous working state of the pumping source is kept, and the service life of the pumping source is prolonged.
And when the laser works in the QCW mode, the industrial personal computer can send a second control signal to the controller, the controller can control a second driving circuit inside the laser to input pulse modulation current to the pump source in a preset second period based on the second control signal, and control a third driving circuit inside the laser to input impact modulation current to the pump source in a specified second period in a plurality of second periods, and the pump source does not need to distinguish the three paths of current.
It should be understood that the specific period of the second period, the specific period of the designated period, the specific value of the impact modulation current, and the like may be set according to actual requirements, and the embodiment of the present application is not limited thereto.
For example, the embodiment of the present application may calculate a second power difference between the peak power and the rated power of the laser, so that the second power difference may be used as the frequency of the impact modulation, and further, the specific value of the impact modulation current may be determined based on the frequency of the impact modulation. That is, the impact modulation current is determined based on the peak power of the laser and the rated power of the laser. And the size, the time ratio and the like of the impact modulation current can be set according to the process.
It should be noted here that, in the process of outputting the impulse modulation current, the impulse modulation power is superimposed on the pulse modulation output power, so that the pump source reaches the peak power instantaneously, and the impact force and the perforation speed of the sheet material cutting can be increased.
For example, please refer to fig. 2, fig. 2 shows a schematic diagram of a power timing and stacking relationship provided in an embodiment of the present application. As shown in fig. 2, the laser can generate the threshold power of the pump source because the controller can control the first driving circuit to continuously input the threshold current to the pump source during the time period when the pump source is turned on. And when the laser works in the QCW mode, the controller controls a second driving circuit inside the laser to input pulse modulation current to the pump source in six second periods T, and controls a driving circuit inside the laser to input impact modulation current to the pump source in the first second period T, so that the driving circuit can generate pulse modulation output and impact modulation output. And, during the first second period T, the pump power of the pump source may be the sum of the pump source threshold power, the pulse modulation output, and the impulse modulation output, that is, the pump source threshold power, the pulse modulation output, and the impulse modulation output may be superimposed, and during the second period T to the sixth second period T, the pump power of the pump source may be the sum of the pump source threshold power and the pulse modulation output (for example, when the pulse modulation signal corresponding to the pulse modulation output is 0, the pump power is the pump source threshold power; when the pulse modulation signal corresponding to the pulse modulation output is not 0, the pump power reaches the rated power).
It should be noted here that, although the impact modulation pulse signal corresponding to the impact modulation output in fig. 2 is a square waveform (or a step type), it should be understood by those skilled in the art that the impact modulation pulse signal may also be provided in other forms, and the embodiment of the present application is not limited thereto.
For example, in the case that a distance sensor for detecting a distance between the laser head and the surface of the sheet material to be processed is provided at the laser head of the laser system and the surface of the sheet material to be processed is an uneven surface, so that the controller can detect a real-time distance between the laser head and the surface of the sheet material to be processed through the distance sensor and can compare the magnitude between the real-time distance and a reference distance, wherein the reference distance may be a distance between a reference point on the surface of the sheet material to be processed and the laser head, and the reference point may be a point at which laser cutting can be performed when the laser is at a rated power. If the real-time distance is smaller than the reference distance, the current point to be cut can be determined to be relative to the reference point and is in a rising trend, so that the thickness of the plate at the current cutting point is judged to be larger than that of the plate at the reference point, and then the controller can output the impact modulation current corresponding to the triangular impact modulation pulse signal shown in the figure 3A to the pumping source, so that the laser can increase the output power; if the real-time distance is greater than the reference distance, it can be determined that the current point to be cut is in a descending trend relative to the reference point, so that the plate thickness of the current cutting point is determined to be smaller than that of the reference point, and then the controller can output impact modulation current corresponding to the inverted triangular impact modulation pulse signal (namely the inverted triangular impact modulation pulse signal can be used for reducing power) shown in fig. 3B to the pumping source, so that the laser can reduce the output power, and the effect of saving energy is achieved.
In addition, for the above scheme, the industrial personal computer may further send the multiple rising amplitude impact modulation pulse signals similar to those in fig. 3A to the controller, and then the controller may determine within which distance range the real-time distance belongs, when determining that the real-time distance is smaller than the reference distance. If the real-time distance is determined to be within the first ascending distance range, the controller can select the impact modulation pulse signal corresponding to the first ascending distance range from the impact modulation pulse signals with the ascending amplitudes, and then the controller can output the impact modulation current corresponding to the impact modulation pulse signal corresponding to the first ascending distance range to the pumping source, so that the laser can output power of a corresponding level; if it is determined that the real-time distance falls within the second range of the ascending distance, the controller may select, from the plurality of impact modulation pulse signals with ascending amplitudes, an impact modulation pulse signal corresponding to the second range of the ascending distance, and then the controller may output, to the pump source, an impact modulation current corresponding to the impact modulation pulse signal corresponding to the second range of the ascending distance, so that the laser may output a power of a corresponding level.
Correspondingly, for a scheme similar to the scheme of fig. 3B for reducing the output power, there is a scheme matching with the range of the ascending distance of the increased output power shown in fig. 3A, which may be referred to specifically for the above scheme, and repeated description is omitted here.
For example, if it is determined that the real-time distance falls within the first descending distance range, the controller may select a shock modulation pulse signal corresponding to the first descending distance range from the plurality of shock modulation pulse signals of descending amplitudes, and then the controller may output a shock modulation current, such as a shock modulation pulse signal corresponding to the first descending distance range, to the pump source, so that the laser can reduce the output power.
It should be noted here that, compared to the square wave form in fig. 2, the pulse modulation signal form shown in fig. 3A and 3B is not such that the laser is in the maximum peak power state in a certain time period (i.e., the time period corresponding to the square wave impulse modulation pulse signal), but is only the peak of the peak power state at a time point, and except for the time point, other time points of the time period are in the ascending process or the descending process, thereby facilitating the cooling of the laser head.
It should be noted here that, in addition to the triangular shape, the impact modulation pulse signal may be replaced with an impact modulation pulse signal having another shape such as an S-shape according to the processing requirements of the sheet material.
It should be further noted that, a user may input parameter information on a parameter setting interface on the industrial personal computer side, the industrial personal computer may generate a corresponding second control signal based on the parameter information input by the user, and the controller may control a driving circuit inside the laser to input a corresponding impact modulation current to the pump source based on the second control signal, so that the pump source outputs a corresponding impact modulation pulse signal.
It should be understood that the information included in the parameter information may be set according to actual requirements, and the embodiments of the present application are not limited thereto.
For example, the parameter information may include selection of the impact power, material information of the material to be cut (e.g., material type and thickness of the sheet material, etc.), duty cycle, frequency, and the like. And the industrial personal computer can independently judge and adapt based on the selection of the impact power, the material information, the duty ratio and the frequency information, so that the use difficulty of operators is reduced, and the reliability of functions is improved.
It should be understood, of course, that the specific pulses of the impulse modulation pulse signal may be generated according to the input parameter information, and the embodiments of the present application are not limited thereto.
For example, the waveform of the impact modulation pulse signal may be a triangle, and the triangle may be a regular triangle, and its internal angles may be 60 °, or a right-angled triangle as shown in fig. 4A and 4B, which may be divided into two types, i.e., a right-angled triangle with vertical right-angled sides on the left side or right side of the triangle, or an obtuse-angled triangle as shown in fig. 4C, and the rest of the regular triangles are different in the acceleration and deceleration of the impact power and the magnitude of the peak power. Wherein, for the impulse modulation pulse signal as shown in fig. 4A, the power of the pulse may reach the peak at the beginning instantaneously, and then its power is slowly decreased; for the impulse modulated pulse signal shown in FIG. 4B, the power of the pulse may slowly increase; for a shock modulated pulse signal as shown in fig. 4C, the power of the pulse slowly increases and after its power reaches a maximum, its power slowly decreases.
Further, when the material to be cut is thick carbon steel and the thickness of the thick carbon steel is 30mm to 60mm, obtuse angle impact pulses (or obtuse angle impact power) as shown in fig. 4C can be adopted, and the power can improve the punching speed and prevent the plate from being over-burnt; when the material to be cut is non-ferrous metal (e.g., stainless steel or copper), the impact modulation pulse signal (or impact power curve) as shown in fig. 4A and 4B can be used to increase the piercing speed and prevent slag splashing.
It should also be understood that in the case where the pulse waveform of the impact modulation pulse signal is different, the proportion thereof occupied in the second period may be different, so that the cutting effect may be improved.
For example, when the waveform of the impact modulation pulse signal is a square waveform as shown in fig. 2, the impact modulation pulse signal may occupy 1/6~1/4 of one pulse period (i.e., the second period T);
for another example, when the waveform of the pulse signal is a right triangle as shown in fig. 4A to 4B or an obtuse triangle as shown in fig. 4C, the pulse signal may occupy 1/6~1/2 of one pulse period (i.e., the second period T);
for another example, the above impacts of various shapes may also be in a preset time, with the ratio of the impact to the pulse period tfroke: t is 1:1-3:1.
In addition, the waveform of the impulse pulse signal in the present application may be a signal in which a linear waveform, a nonlinear waveform, and the like are mixed, in addition to the above-described waveform. For example, the waveform of the impact pulse signal in one cycle may be composed of a square waveform as shown in fig. 2 and a right triangle as shown in fig. 4A; the waveform of the impulse signal in the other period may be composed of a square waveform as shown in fig. 2 and an obtuse triangle as shown in fig. 4C.
Therefore, in the embodiment of the application, when the laser is turned on, the driving circuit inside the laser is controlled to continuously input the threshold current to the pumping source until the laser is turned off, and the threshold current is stopped being input, so that the current of the laser can rise from the threshold current and fall to the threshold current.
In addition, because the impact modulation current in this application embodiment can receive the accurate control of industrial computer to can make perforation effect and speed obtain promoting.
In addition, because the laser cutting system in the embodiment of the application can be provided with the optical sensor and the temperature sensor, the laser can carry out self-checking in real time after being started, and the situation that devices inside the laser are burnt down when the laser is started for the first time can be avoided.
It should be understood that, although a specific schematic diagram of the laser cutting system is shown above, it should be understood by those skilled in the art that the laser cutting system may also be configured according to actual needs, and the embodiments of the present application are not limited thereto.
For example, the laser cutting system further includes a temperature sensor for detecting a temperature of a driving circuit inside the laser. And the controller can acquire the circuit temperature acquired by the temperature sensor, judge whether the circuit temperature is greater than or equal to a preset temperature, and alarm if the circuit temperature is greater than or equal to the preset temperature. And, the temperature related alarm and the current related alarm may be the same alarm mode, and may be different alarm modes.
For another example, although the three currents in the present application may be controlled by three independent driving circuits (i.e., the first driving circuit, the second driving circuit, and the third driving circuit), it may also be implemented by replacing the three currents with one driving circuit, and the replaced driving circuit may logically divide the output current into 3 parts, and the current finally output by the replaced driving circuit is the sum of the 3 logic currents.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.

Claims (4)

1. A laser cutting system comprising a laser and the laser comprising a controller and a pump source;
the controller is used for controlling a driving circuit inside the laser to continuously input threshold current to the pumping source when the laser is started until the laser is closed;
the laser cutting system further comprises an industrial personal computer, wherein the industrial personal computer is used for sending a first control signal to the controller under the condition that the working mode of the laser is a continuous laser mode;
the controller is specifically configured to control a driving circuit inside the laser to input a pulse modulation current to the pump source at a preset first period based on the first control signal;
the pumping source is used for outputting pumping laser based on the threshold current and the pulse modulation current;
the industrial personal computer is further used for sending a second control signal to the controller under the condition that the working mode of the laser is a quasi-continuous laser mode;
the controller is further configured to control the driving circuit inside the laser to input the pulse modulation current to the pump source at a preset second period based on the second control signal, and to control the driving circuit inside the laser to input a shock modulation current to the pump source at a specified second period in a plurality of second periods;
the pumping source is further used for outputting pumping laser based on the threshold current, the pulse modulation current and the impact modulation current;
the laser cutting system further comprises a light sensor arranged at the interface of the laser and the optical fiber, the light sensor can collect a light intensity value at the interface of the laser and the optical fiber, convert the light intensity value into a real-time current value, and compare the real-time current value with a set current threshold value through a current comparator; if the real-time current value is less than or equal to the current threshold value, immediately giving an alarm; the current threshold value corresponds to a value when the pumping source current is threshold current;
the laser cutting system further comprises a distance sensor disposed at a laser head of the laser cutting system; the controller detects the real-time distance between the laser head and the surface of the plate to be processed through the distance sensor, and compares the real-time distance with a reference distance; the reference distance is the distance between a reference point on the surface of the plate to be processed and the laser head, and the reference point is a point where the laser can carry out laser cutting when the laser is at rated power; if the real-time distance is smaller than the reference distance, the controller outputs impact modulation current corresponding to the impact modulation pulse signal with a triangular or square waveform to the pumping source, so that the laser can increase the output power; if the real-time distance is larger than the reference distance, the controller outputs impact modulation current corresponding to the impact modulation pulse signal with the inverted triangle or square waveform to the pumping source, so that the laser can reduce the output power.
2. The laser cutting system of claim 1, wherein the pulse modulation current is determined based on a rated power of the laser, and the shock modulation current is determined based on a peak power of the laser and the rated power of the laser.
3. The laser cutting system of claim 1, wherein the threshold current has a current range of 1 to 2A.
4. The laser cutting system of claim 1, further comprising a temperature sensor for detecting a temperature of a drive circuit inside the laser;
the controller is specifically configured to obtain the circuit temperature acquired by the temperature sensor, determine whether the circuit temperature is greater than or equal to a preset temperature, and perform alarm processing if the circuit temperature is greater than or equal to the preset temperature.
CN202211483173.4A 2022-11-24 2022-11-24 Laser cutting system Active CN115533345B (en)

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