CN101920399B - Method and device for cutting stainless steel sheet with fiber laser - Google Patents
Method and device for cutting stainless steel sheet with fiber laser Download PDFInfo
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- CN101920399B CN101920399B CN201010258021.5A CN201010258021A CN101920399B CN 101920399 B CN101920399 B CN 101920399B CN 201010258021 A CN201010258021 A CN 201010258021A CN 101920399 B CN101920399 B CN 101920399B
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Abstract
The invention relates to a method and a device for cutting a stainless steel sheet with fiber laser. The method comprises the following steps of: (1) lowering the cutting speed in an initial cutting stage relative to a preset cutting speed; (2) correspondingly adjusting the cutting parameter of the laser in a cutting progress through judging a cutting corner in real time; and (3) automatically controlling a laser to blow auxiliary gas before light output and closing the auxiliary gas after the laser is turned off. The device for cutting the stainless steel sheet with the fiber laser comprises a workbench, the laser, a fiber, a collimator, an image sensor, a display and a control unit. The method and the device for cutting the stainless steel sheet with the fiber laser can be applied to the fiber laser cutting processes of various stainless steel sheets, and the cutting quality of the stainless steel sheets is good; the phenomenon of cut resistance is not easy to appear; the stainless steel sheet has uniform heat radiation and difficult excessive erosion; the protection gas is saved, and the cutting cost is reduced; and the positioning precision is improved, and the cutting process can be monitored in real time.
Description
Technical field
The present invention relates to optical-fiber laser cutting technique field, relate in particular to a kind of method and device of cutting stainless steel sheet with fiber laser.
Background technology
Along with the development of laser technique, optical fiber laser is applied in the every field of Laser Processing with its distinctive advantage.Especially it has good beam quality, and perfectly Gaussian beam is easier to be applied in thin plate cutting field.Current optical-fiber laser cutting equipment, diced system control program is generally by professional software supplier's development and Design, and the control program of exploitation has certain deficiency.In engineering application, find that current applied optical-fiber laser diced system exists following shortcoming.1. control software aspect: 1. setting various technological parameters to guarantee in the good situation of straight cuts effect, excessively ablation during cutting corner, reduces corner quality; Particularly low-angle acute angle cutting, because cutting path is overlapping, causes laser energy to concentrate, and causes the generally excessive ablation of meeting of corner; In order to guarantee integral cutting quality, at diverse location, will set different parameters and cut, parameter modification is comparatively loaded down with trivial details; 2. when setting various technological parameters and guarantee that cutting effects are fine, often at cutting start-up portion, there is the phenomenon not cutting through, also can cause sheet material overheating deforming around; 3. whether existing control program can be controlled assist gas and blow but can not judge whether bright dipping, can not control assist gas and when going out laser, blow, do not blow while closing laser.2. in engineering application, to the workpiece location of cutting when initial, be generally to adopt ruddiness location, but existing process equipment can only be observed whether accurate positioning from the side with operating personnel's eyes, setting accuracy is not high like this.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of method and device of the cutting stainless steel sheet with fiber laser that improves cut quality.
For achieving the above object, the invention provides a kind of method of cutting stainless steel sheet with fiber laser, comprising:
Step 1. reduces cutting speed in the starting stage of cutting compared to predetermined cutting speed;
In step 2. cutting process, by real-time judge, cut corner size, the cutting parameter of corresponding adjustment laser;
Step 3. is controlled laser instrument and before bright dipping, is automatically blown assist gas, after the light of pass, automatically closes assist gas.
Wherein, in step 2, compared to the laser pulse frequency for cutting straight line of initial setting up, when the little corner of cutting, reduce laser pulse frequency.
Wherein, if corner is less than 90 degree and is greater than 30 degree, laser pulse frequency is reduced to 85% of settings; If corner is less than or equal to 30 degree and is greater than 0 degree, laser pulse frequency is reduced to 70% of settings.
Wherein, in step 2, compared to the laser pulse frequency for cutting straight line of initial setting up, when the large corner of cutting, keeping the pulse frequency of laser is initial settings.
Wherein, if corner is more than or equal to 90 degree and is less than 360 degree, keeping the pulse frequency of laser is initial settings.
Wherein, at the vertical direction of the cut surface of workbench, imageing sensor is set, the realtime graphic of cut surface is passed to display, the original position by the Image Adjusting workbench observed by display and monitor in real time cutting process.
The present invention also provides a kind of device of cutting stainless steel sheet with fiber laser, comprise: workbench, laser instrument, optical fiber, collimater, imageing sensor, display and control module, this collimater is positioned on the vertical direction of cut surface of workbench, this collimater is provided with opening and introduces for optical fiber and assist gas, laser that laser instrument sends imports collimater and vertically irradiates cut surface by collimater via optical fiber, this imageing sensor is positioned on the vertical direction of cut surface and reaches display with the realtime graphic cut surface, this control module and workbench and laser instrument communicate to connect to control in real time the mechanical movement of workbench and the output parameter of laser instrument.
Wherein, described imageing sensor is CCD imaging device.
Wherein, described imageing sensor is positioned at directly over this collimater, aims at the direction of illumination of laser.
In sum, the method for cutting stainless steel sheet with fiber laser of the present invention and device can be applicable to the optical-fiber laser cutting process of all kinds of stainless sheet steels, make cutting obtain good quality; Be not prone to and do not cut through phenomenon; Make stainless sheet steel heat radiation evenly, be not prone to excessive ablation phenomen; Save the use of protective gas, reduce cutting cost; Improved positioning precision and can monitor in real time cutting process.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, by the specific embodiment of the present invention is described in detail, will make technical scheme of the present invention and other beneficial effects apparent.
In accompanying drawing,
Fig. 1 is the schematic flow sheet of the control program of method one preferred embodiment of cutting stainless steel sheet with fiber laser of the present invention;
Fig. 2 is the differentiation to different cutting angles of the control program of method one preferred embodiment of cutting stainless steel sheet with fiber laser of the present invention;
Fig. 3 is the structural representation of device one preferred embodiment of cutting stainless steel sheet with fiber laser of the present invention.
The specific embodiment
For realizing automation, optical-fiber laser cutting adopts digital control scheme to operate conventionally, numerical control (NC---Numerical Control, digital control) refer to and realize the technology of one or more plant equipment action control by the digital command of numeral, word and symbol composition, mechanical quantity such as normally position that numerical control code is controlled, angle, speed and flow to relevant switching value with mechanical energy.Therefore, the concrete application of the method for cutting stainless steel sheet with fiber laser of the present invention, can show by the form of numerical control program.
Fig. 1 is the schematic flow sheet of the control program of a preferred embodiment.Control system is carried out numerical control code according to the NC cutting process pre-entering, to complete cutting operation.As shown in Figure 1, first NC cutting process reads NC cutting codes after starting, and judges whether the code of reading is bright dipping code, the operation of then taking to reduce the operation of cutting speed or not reducing cutting speed according to judged result.Shown in Fig. 1, be only the schematic flow sheet of the control program in this embodiment, in order to method of the present invention is illustrated, for the concrete cutting control program of having done according to difference cutting work, this flow process also can correspondingly change.
Compared to the method for existing optical-fiber laser cutting stainless steel plate, apply the control program of the numerically controlled control system after method improvement of the present invention, comprising:
Starting stage in cutting is reduced cutting speed compared to predetermined cutting speed.The cutting speed that increases control program changes function in real time, for control program interpolation speed is adjusted function, while reading the code that goes out laser in numerical control code, the speed of calling is adjusted function, the cutting speed that reduces to set is recovered the cutting speed setting after a period of time is carried out in cutting.That is to say, in the cutting starting stage, because laser is stable not enough, compared to predetermined cutting speed in technological parameter, the cutting speed that reduces the starting stage can make stainless sheet steel absorb enough laser energies, is unlikely to occur not cutting through phenomenon.
In cutting process, by real-time judge, cut corner size, the cutting parameter of corresponding adjustment laser.The laser parameter that increases control program changes function in real time, when cutting process is read corner code, and judgement cutting corner size, adjust different cutting parameters, that is to say, compared to the laser pulse frequency of straight cuts, according to corner size, reduce the laser pulse frequency of corner.When cutting smaller angle, reduce laser pulse frequency, make stainless sheet steel heat radiation evenly, be not prone to excessive ablation phenomen.So just be unlikely in less corner, laser energy is too concentrated and is caused the excessive ablation of wedge angle.
Corresponding for corner angle and laser pulse frequency, can be specifically selected according to actual needs, for example: if corner is more than or equal to 90 degree and is less than 360 degree, control program does not change laser parameter, continues to carry out next code; If corner is less than 90 degree and is greater than 30 degree, control program is reduced to laser pulse frequency 85% of settings automatically; If corner is less than 30 degree and is greater than 0 degree, control program is reduced to laser pulse frequency 70% of settings automatically.
Fig. 2 is the differentiation to different cutting angles of the control program of method one preferred embodiment of cutting stainless steel sheet with fiber laser of the present invention, in Fig. 2, dash area represents the material that must remove, blank parts represents required workpiece, also can carry out corresponding change laser parameter according to the mode of distinguishing cutting angle in Fig. 2.
Automatically control laser instrument bright dipping fore blow assist gas, after the light of pass, close assist gas.For control program adds code, pre-read function, before carrying out cutting codes, control program reads cutting codes in advance one time, before bright dipping code, automatically adds and blows afloat code, automatically adds the gas code of entering the GATT after black out code; Control laser instrument bright dipping fore blow assist gas, after the light of pass, close assist gas.So just be unlikely to assist gas and blowing always or do not blowing always, also reduce cutting operation person's code and write work.Save the use of assist gas, reduce cutting cost.
Further, at the vertical direction of the cut surface of workbench, imageing sensor is set, the realtime graphic of cut surface is passed to display, the original position by the Image Adjusting workbench observed by display and monitor in real time cutting process.On the screen of display, show the point of location ruddiness on stainless sheet steel, corresponding adjustment work-table position, accurately positional dissection starting point.Can make like this positioning precision improve, and the use that can save thin plate raw material.Compared to the method for existing cutting stainless steel sheet with fiber laser, the imageing sensor of increase can easier accurate location and is monitored in real time cutting process.
Fig. 3 is the structural representation of device one preferred embodiment of cutting stainless steel sheet with fiber laser of the present invention, the device of this cutting stainless steel sheet with fiber laser comprises: workbench 1, laser instrument 2, optical fiber 3, collimater 4, imageing sensor 5, display 6 and control module 7, this collimater 4 is positioned on the vertical direction of cut surface of workbench 1, this collimater 4 is provided with opening and introduces for optical fiber 3 and assist gas, laser instrument 2 laser that sends imports collimater 4 and vertically irradiates cut surface by collimater 4 via optical fiber 3, this imageing sensor 5 is positioned on the vertical direction of cut surface so that the realtime graphic of cut surface is reached to display 6, this control module 7 communicates to connect to control in real time the mechanical movement of workbench 1 and the output parameter of laser instrument 2 with workbench 1 and laser instrument 2.The method of cutting stainless steel sheet with fiber laser provided by the present invention can be applicable to the device of the cutting stainless steel sheet with fiber laser of this preferred embodiment.
In this preferred embodiment, imageing sensor 5 is CCD imaging device; Imageing sensor 5 is positioned at directly over collimater 4, aims at the direction of illumination of laser; Workbench 1 is X-Y mechanical movement platform.Workbench 1 controls by control module 7 the change speed in cutting process that realizes; Control module 7 can be controlled laser instrument 2 output parameters and change in cutting process; Control module 7 automatically adds and blows the NC code of holding one's breath before cutting; Imageing sensor 5 can easier accurate location and is monitored in real time cutting process.The features such as it is high that the device of cutting stainless steel sheet with fiber laser of the present invention has positioning precision, and cutting accuracy is high, and maintenance cost is low, and whole set equipment volume is little.
In sum, the method for cutting stainless steel sheet with fiber laser of the present invention and device can be applicable to the optical-fiber laser cutting process of all kinds of stainless sheet steels, make cutting obtain good quality; Be not prone to and do not cut through phenomenon; Make stainless sheet steel heat radiation evenly, be not prone to excessive ablation phenomen; Save the use of protective gas, reduce cutting cost; Improved positioning precision and can monitor in real time cutting process.
The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection domain of the accompanying claim of the present invention.
Claims (3)
1. a method for cutting stainless steel sheet with fiber laser, is characterized in that, comprising:
Step 1. reduces cutting speed in the starting stage of cutting compared to predetermined cutting speed;
In step 2. cutting process, by real-time judge, cut corner size, the cutting parameter of corresponding adjustment laser;
Step 3. is controlled laser instrument and before bright dipping, is automatically blown assist gas, after the light of pass, automatically closes assist gas;
In step 2, compared to the laser pulse frequency for cutting straight line of initial setting up, when the little corner of cutting, reduce laser pulse frequency;
If corner is less than 90 degree and is greater than 30 degree, laser pulse frequency is reduced to 85% of settings; If corner is less than or equal to 30 degree and is greater than 0 degree, laser pulse frequency is reduced to 70% of settings;
In step 2, compared to the laser pulse frequency for cutting straight line of initial setting up, when the large corner of cutting, keeping the pulse frequency of laser is initial settings;
If corner is more than or equal to 90 degree and is less than 360 degree, keeping the pulse frequency of laser is initial settings;
Vertical direction at the cut surface of workbench arranges imageing sensor, and the realtime graphic of cut surface is passed to display, the original position by the Image Adjusting workbench observed by display and monitor in real time cutting process.
2. the device of a cutting stainless steel sheet with fiber laser, it is characterized in that, comprise: workbench, laser instrument, optical fiber, collimater, imageing sensor, display and control module, this collimater is positioned on the vertical direction of cut surface of workbench, this collimater is provided with opening and introduces for optical fiber and assist gas, laser that laser instrument sends imports collimater and vertically irradiates cut surface by collimater via optical fiber, this imageing sensor is positioned on the vertical direction of cut surface and reaches display with the realtime graphic cut surface, this control module and workbench and laser instrument communicate to connect to control in real time the mechanical movement of workbench and the output parameter of laser instrument,
Described imageing sensor is CCD imaging device.
3. the device of cutting stainless steel sheet with fiber laser according to claim 2, is characterized in that, described imageing sensor is positioned at directly over this collimater, aims at the direction of illumination of laser.
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| CN201010258021.5A CN101920399B (en) | 2010-08-19 | 2010-08-19 | Method and device for cutting stainless steel sheet with fiber laser |
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| CN201010258021.5A CN101920399B (en) | 2010-08-19 | 2010-08-19 | Method and device for cutting stainless steel sheet with fiber laser |
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| CN110369884A (en) * | 2019-08-21 | 2019-10-25 | 奔腾楚天激光（武汉）有限公司 | A kind of turning pulse cutting process of processing thick carbon steel plate right angle processing |
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| CN110369884A (en) * | 2019-08-21 | 2019-10-25 | 奔腾楚天激光（武汉）有限公司 | A kind of turning pulse cutting process of processing thick carbon steel plate right angle processing |
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Address after: 523000 Guangdong, Dongguan Songshan Lake high tech Industrial Development Zone Industrial Road, No. 28 Applicant after: Guangdong Han's Yueming Laser Technology Co., Ltd. Address before: 523000 Guangdong province Dongguan City Wanjiang Yan Wu Community Industrial Zone Applicant before: Guangdong Han's Yueming Laser Technology Co., Ltd. |
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Address after: 523000 Guangdong, Dongguan Songshan Lake high tech Industrial Development Zone Industrial Road, No. 28 Patentee after: GD HAN'S YUEMING LASER GROUP CO., LTD. Address before: 523000 Guangdong, Dongguan Songshan Lake high tech Industrial Development Zone Industrial Road, No. 28 Patentee before: Guangdong Han's Yueming Laser Technology Co., Ltd. |