CN101314195A - Focal compensation process of laser device for cutting - Google Patents
Focal compensation process of laser device for cutting Download PDFInfo
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- CN101314195A CN101314195A CN 200710105473 CN200710105473A CN101314195A CN 101314195 A CN101314195 A CN 101314195A CN 200710105473 CN200710105473 CN 200710105473 CN 200710105473 A CN200710105473 A CN 200710105473A CN 101314195 A CN101314195 A CN 101314195A
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Abstract
The invention relates to a method for compensating a focal power of a laser cutting device. The laser cutting device comprises a laser oscillation generator, a reflector, a focusing lens, a numerical controller, a driver and a machining carrier; the reflector is arranged on a beam path emitted by the laser oscillation generator; the focusing lens is arranged on a laser beam path reflected by the reflector and configured on the machining carrier; the machining carrier is connected with the driver and the numerical controller and is control by the numerical controller to move the position of the carrier by the driver; and the method for compensating the focal power comprises the following steps: a curve graph of the size change of a facula of the laser oscillation generator is preacquired; reference data is set up to simulate the curve graph and input to the numerical controller as a database for comparison; when the focusing lens carried by the machining carrier is moved to different positions, a variable quantity of a focusing point of the focusing lens is calculated by the numerical controller corresponding to a numerical value of the reference data; and a command is emitted to the driver by the numerical controller to change the position of the focusing lens of the carrier so as to compensate the error of the focal power generated by the size change of a divergence angle of a laser beam.
Description
Technical field
The present invention is about a kind of light focal compensation process of laser cutting device, and particularly a kind of light focal compensation process that utilizes improves the light focal compensation process of final finished size because of the laser cutting device of laser beam divergent angle error that size variation produces.
Background technology
Laser (Laser) is the new term of science and technology over nearly 20 years, and its The Application of Technology constantly obtains to break through, and comprises that industry processing kenel is also had distinguished contribution, such as boring, cutting, welding and various material hot treatment etc.
Along with the increase of field of laser processing, laser is required from small-power gradually towards powerful level development.With the cutting processing is example, and the thickness that is cut object constantly increases, and the cross section quality and the accuracy of the cutting that requires must be kept; Therefore, how the stability of more accurate control laser beam and reach the high standard crudy is all directions of using manufacturer's effort always of laser cutting devices.
With Fig. 1 is example, general laser beam produces the back emission via oscillator, because the angle of beam divergence changes, make in the received scope of the diverse location of same light path also inconsistent, as scheme the speculum 10,11 of P1 and P2 position, since the difference of laser reflection diameter R1 and R2, and directly have influence on the position that the rear end focuses on; Promptly, the focus lamp group 12,13 of under identical rerum natura condition, furnishing, the depth of focus that is produced (DOF) F1, F2 have the variation of dystopy, and finally forming as shown in Figure 2, the laser actual loaded causes the suitable puzzlement of operator in position and the predefined paths or the degree of depth generation deviation of object.Particularly the heal equipment of big stroke, it is bigger perhaps to process the thick influence that cutting caused of healing of object thickness; If the problem that laser beam divergence changes is not improved, then institute's cut quality that causes is inconsistent, and the scale error that causes the output finished product at last increases and is difficult to control quality.
In order to address the above problem, the same trade develops successively and some improvement schemes." design of light path equal length " as shown in Figure 3, shown in Figure 4 " utilizing the telescope group to reduce laser beam divergence degree (TELESCOPECOUPLER) " or the technology such as " variable curvature mirror group (ADAPTIVE MIRROR) " that Fig. 5 disclosed; But wherein still be no lack of and have following listed defective:
(1) shortcoming of " design of light path equal length " is:
(1) mechanism is comparatively complicated, and required cost height is not suitable for big stroke bed platform;
(2) have more two speculum groups 15,16, making in the future, maintenance cost improves;
(3) many turnovers of laser oscillator 1 beam path that produces, and increase by two speculum groups 15,16, make light path proofread and correct difficulty and improve relatively;
(4) have more two speculum groups 15,16, and will with the same moved further of the carrier of cutter sweep, be not suitable for the lathe of high-speed cutting.
(2) " utilizing the telescope group to reduce laser beam divergence degree (TELESCOPE COUPLER) " mainly is to produce at laser oscillator 1 to install a concave and convex lenses group 17,18 in the beam path additional, arranges with " Z " font attitude, in order to dwindle laser beam divergence; Its shortcoming is:
(1) specification of described concave and convex lenses group 17,18 must cooperate the position and the range of work size design of laser beam waist (WAIST), and its deployment cost costliness, and because the lens element of the criteria of right and wrong is safeguarded in the future and to consume expenditure considerable;
(2) can't eliminate the laser beam divergence degree fully and change the influence caused, and the quality and the scale error of far away, the nearly processing stand of large-scale bed platform still can't be improved, when bed platform size just inapplicable greater than 2M*4M;
(3) owing to install one group of concave and convex lenses additional in the device, make more shape difficulty of light path correction work.
(3) " variable curvature mirror group (ADAPTIVE MIRROR) " utilizes hydraulic pressure or air pressure control, change the surperficial curvature of speculum 19, make and produce identical spot size when cutting, in order to the quality of stabilized lasers cutting and reduce the scale error of output finished product in the different light paths position; Its shortcoming is:
(1) variable curvature mirror group 19 is a speculum, cost an arm and a leg, and the consumption and the maintenance cost of normality is considerable in the future, exceeds about 20 times than general standard speculum group approximately;
(2) having relatively high expectations of the precision of laser optical path correction and center normotopia degree, otherwise the plane of bending of mirror group will cause the deviation of light path bigger;
(3) error of the variable curvature of described mirror group can change to some extent with conditions such as environment temperature, lens surface cleanliness factor and laser power sizes, and increases the degree of difficulty of control, at last the last size that produces hot spot of influence.
In addition, prior art document such as the laser cutting application facet comprises the U.S. the 5th, 690, No. 785,5,783, No. 814,5,594, wait patent content No. 235, though the dynamic focus technology of discussion and/or relevant focus point degree of depth problem are arranged, all do not have to connect, in order to improve the influence degree of the error that causes with the idea of " variation of laser beam divergence degree ".
Summary of the invention
The object of the present invention is to provide a kind of light focal compensation process of laser cutting device, improve the error that the final finished size is produced because of the laser beam divergent angle size variation with this.
Smooth focal compensation process provided by the invention, realized with the following step:
(1), in advance obtain laser generation generator one section curve map that the stable spot size that length range showed changes after producing light beam mode, or the curve map of beam divergence angle size variation;
(2), set up one " reference data " and simulate aforementioned curve map, and will be somebody's turn to do the database of " reference data " input digital control implement as comparison;
(3), move to diverse location according to processing microscope carrier contained focus lamp, the numerical value of corresponding aforementioned " reference data ", and calculate the variable quantity of the focus point of this focus lamp by digital control implement;
(4), send instruction by digital control implement and change the error that the focus lamp position on the microscope carrier is produced because of the laser beam divergent angle size variation with compensation light Jiao to driver.
The light focal compensation process of a kind of laser cutting device provided by the invention, this device comprises laser generation generator, speculum, focus lamp, digital control implement, driver and processing microscope carrier, wherein, this speculum is located on the laser generation generator institute emitted light beams path, focus lamp is located on the laser beam path after the mirror reflects, and be disposed at the processing microscope carrier, this processing microscope carrier links to each other with driver and digital control implement, is subjected to digital control implement control to move processing microscope carrier position with driver; This light focal compensation process is:
(1), in advance obtain laser generation generator one section curve map that the stable spot size that length range showed changes after producing light beam mode, or the curve map of beam divergence angle size variation;
(2), set up a reference data and simulate aforesaid curve map, and with the database of this reference data input digital control implement as comparison;
(3), move to diverse location according to processing microscope carrier contained focus lamp, the numerical value of corresponding above-mentioned reference data, and calculate the variable quantity of the focus point of this focus lamp by digital control implement;
(4), send instruction by digital control implement and change the error that the focus lamp position on the microscope carrier is produced because of the laser beam divergent angle size variation with compensation light Jiao to driver.
Compared to prior art, advantage of the present invention comprises:
1, in the process technology of laser cutting, can obtain the stability of total travel crudy and each processed finished products dimensional accuracy, particularly be applied to big stroke or powerful cutting environment, institute's effect that obtains is more remarkable.
2, global design is simple, does not need significantly to revise optics and structural design thereof, to reduce maintenance cost.
3, do not need additionally to increase optical mirror slip in the device, to save cost and the maintenance of consumptive material in the future.
4, need not change existing laser optical path correction program, make operation be tending towards simple and easy.
5, Zhuan Zhi the scope of application and compatible big, the laser generation generator of various label all can be used in cutting processing technology of the present invention.
Description of drawings
Fig. 1 is the processing allocation plan of existing laser cutting device.
Fig. 2 is that the laser actual loaded is in the position of object and the contrast figure of predefined paths or deviation that the degree of depth produces.
Fig. 3 is the processing allocation plan of existing " design of light path equal length " laser cutting device.
Fig. 4 is the processing allocation plan of existing " utilizing the telescope group to reduce the laser beam divergence degree " laser cutting device.
Fig. 5 is the processing allocation plan of existing " variable curvature mirror group " laser cutting device.
Fig. 6 is the flow process chart of laser cutting device of the present invention.
Fig. 7 is the processing allocation plan of laser cutting device of the present invention.
The main element symbol description
2 ... laser generation generator 20 ... laser beam
3 ... speculum 30 ... laser beam path
4,4a ... focus lamp 5,5a ... processed object
6 ... digital control implement 7 ... driver
8 ... processing microscope carrier 50 ... workbench
The specific embodiment
As shown in Figure 6, laser cutting device of the present invention comprises:
Laser generation generator 2 is in order to produce the laser beam 20 of certain limit;
Focus lamp 4, this focus lamp 4 place processing microscope carrier 8, move by microscope carrier 8 focus lamp 4 is positioned on the aforementioned speculum 3 laser beams reflected paths 30, by this focus lamp 4 light beam are assembled corresponding processed object 5 and cut;
Digital control implement 6, CNC (Computer Numerical Control) computer numerical controller for example, the bist data storehouse is in order to connect driver 7 and to control this driver 7 actions;
Smooth focal compensation process of the present invention is:
One, obtain laser generation generator 2 one section curve map that the stable spot size that length range showed changes after producing light beam mode in advance, or the curve map of beam divergence angle size variation;
Two, set up one " reference data " simulation and the identical quadratic equation with one unknown formula of aforementioned curve map, and will be somebody's turn to do " reference data " input digital control implement 6 databases as comparison;
Three, move to diverse location according to processing microscope carrier 8 contained focus lamps 4, the numerical value of corresponding aforementioned " reference data ", and calculate the variable quantity of the focus point of this focus lamp 4 by digital control implement 6;
Four, sending instruction by digital control implement 6 changes the error that focus lamp 4 positions on the microscope carrier 8 are produced because of the laser beam divergent angle size variation with compensation light Jiao for driver 7.
More specifically, enforcement state with Fig. 7 is an example, is equipped with processed object 5,5a on workbench 50, behind the laser beam 20 of laser generation generator emission certain limit, because the angle that light beam 20 is dispersed changes, make in the received scope of the diverse location of same light path also inconsistent.As speculum 3, the 3a of figure at a distance of laser generation generator A1 and A2 diverse location, because the difference of laser reflection diameter θ 1 and θ 2, make the focus lamp group 4, the 4a that furnish under identical rerum natura condition, the depth of focus that is produced (DOF) C1, C2 have the variation of dystopy; Therefore, by aforesaid smooth focal compensation process: in the database of CNC digital control implement 6, set up " reference data " with laser beam divergence size variation curves in advance, according to each processed object 5,5a position, by aforesaid " reference data " the laser beam diameter θ 1 and θ 2 accurate Calculation that are received are come out, and converse variable quantity δ between the focus point with focus lamp 4, the 4a of the identical rerum natura condition of tool, again institute's value is stored in the database of CNC digital control implement 6; In other words, must move to the Working position of icon A1 and A2 when processing microscope carrier 8 contained focus lamps 4, this CNC digital control implement 6 promptly sees through instruction, drive microscope carriers 8 with driver 7 and must change its position according to the δ variable quantity that had before calculated when the A2, in order to compensate the issuable focusing error in rear end.
Last again by the processing sampling of physical location, measure the finished size of each sample position, the error of offset is done further to revise, compensate more accurately obtaining; Sample position point the more, the error of " reference data " of the laser beam divergence size variation curve that coincide relatively also can more restrain.
The inventor is according to the actual test of said method, add all ranges of work in stroke 2M*4M and 2M*6M, its scale error amount is about 0.05mm (is example with the 16mm steel plate) only, and the scope of the burnt compensation of focus lamp light, only at 0～2.4mm with interior variation, can reach the set goal really.
But the above only is a better embodiment of the present invention, can not limit interest field of the present invention with this certainly.Such as have equivalence modification or the variation of knowing that usually the knowledgeable hence does according to spirit of the present invention in the affiliated technical field, all still be covered by in the interest field of the present invention.
Claims (8)
1, a kind of smooth focal compensation process is characterized in that, may further comprise the steps:
(1), in advance obtain laser generation generator one section curve map that the stable spot size that length range showed changes after producing light beam mode, or the curve map of beam divergence angle size variation;
(2), set up a reference data and simulate aforesaid curve map, and with the database of this reference data input digital control implement as comparison;
(3), move to diverse location according to processing microscope carrier contained focus lamp, the numerical value of corresponding above-mentioned reference data, and calculate the variable quantity of the focus point of this focus lamp by digital control implement;
(4), send instruction by digital control implement and change the error that the focus lamp position on the microscope carrier is produced because of the laser beam divergent angle size variation with compensation light Jiao to driver.
2, smooth focal compensation process as claimed in claim 1 is characterized in that, described smooth focal compensation process also comprises step:
(5), take a sample by the processing of physical location, measure the finished size of each sample position, the error of offset is done further to revise, compensate more accurately obtaining, sample position point the more, the error of the reference data of the laser beam divergence size variation curve that coincide relatively also can more restrain.
3, smooth focal compensation process as claimed in claim 1 or 2 is characterized in that, described digital control implement is the computer numerical controller.
4, smooth focal compensation process as claimed in claim 1 or 2 is characterized in that, described reference data is the quadratic equation with one unknown formula.
5, a kind of light focal compensation process of laser cutting device, this device comprises laser generation generator, speculum, focus lamp, digital control implement, driver and processing microscope carrier, wherein, this speculum is located on the laser generation generator institute emitted light beams path, focus lamp is located on the laser beam path after the mirror reflects, and be disposed at the processing microscope carrier, this processing microscope carrier links to each other with driver and digital control implement, is subjected to digital control implement control to move processing microscope carrier position with driver; It is characterized in that this light focal compensation process is:
(1), in advance obtain laser generation generator one section curve map that the stable spot size that length range showed changes after producing light beam mode, or the curve map of beam divergence angle size variation;
(2), set up a reference data and simulate aforesaid curve map, and with the database of this reference data input digital control implement as comparison;
(3), move to diverse location according to processing microscope carrier contained focus lamp, the numerical value of corresponding above-mentioned reference data, and calculate the variable quantity of the focus point of this focus lamp by digital control implement;
(4), send instruction by digital control implement and change the error that the focus lamp position on the microscope carrier is produced because of the laser beam divergent angle size variation with compensation light Jiao to driver.
6, the light focal compensation process of laser cutting device as claimed in claim 5 is characterized in that, described smooth focal compensation process also comprises step:
(5), take a sample by the processing of physical location, measure the finished size of each sample position, the error of offset is done further to revise, compensate more accurately obtaining, sample position point the more, the error of the reference data of the laser beam divergence size variation curve that coincide relatively also can more restrain.
As the light focal compensation process of claim 5 or 6 described laser cutting devices, it is characterized in that 7, described digital control implement is the computer numerical controller.
As the light focal compensation process of claim 5 or 6 described laser cutting devices, it is characterized in that 8, described reference data is the quadratic equation with one unknown formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710105473 CN101314195A (en) | 2007-05-31 | 2007-05-31 | Focal compensation process of laser device for cutting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710105473 CN101314195A (en) | 2007-05-31 | 2007-05-31 | Focal compensation process of laser device for cutting |
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| CN101314195A true CN101314195A (en) | 2008-12-03 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406670A (en) * | 2013-07-02 | 2013-11-27 | 浙江工业职业技术学院 | Laser cutting system for polycrystalline diamond compact |
| CN106141455A (en) * | 2016-09-19 | 2016-11-23 | 东莞市力星激光科技有限公司 | A kind of high-speed, high precision laser cutting machine |
| CN106238926A (en) * | 2016-09-19 | 2016-12-21 | 东莞市力星激光科技有限公司 | A kind of isometric light channel structure of laser cutting machine |
| CN107552975A (en) * | 2017-09-28 | 2018-01-09 | 惠州市洛玛科技有限公司 | The method of cutter device and cutting products |
| CN107552966A (en) * | 2017-09-28 | 2018-01-09 | 惠州市洛玛科技有限公司 | Laser mark printing device and product marking method |
| CN108581242A (en) * | 2018-01-26 | 2018-09-28 | 广州新可激光设备有限公司 | A kind of energy at laser equipment mark edge enhances optimization method |
| CN109822223A (en) * | 2017-11-23 | 2019-05-31 | 大族激光科技产业集团股份有限公司 | A kind of big width laser labeling method and equipment |
-
2007
- 2007-05-31 CN CN 200710105473 patent/CN101314195A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103406670A (en) * | 2013-07-02 | 2013-11-27 | 浙江工业职业技术学院 | Laser cutting system for polycrystalline diamond compact |
| CN106141455A (en) * | 2016-09-19 | 2016-11-23 | 东莞市力星激光科技有限公司 | A kind of high-speed, high precision laser cutting machine |
| CN106238926A (en) * | 2016-09-19 | 2016-12-21 | 东莞市力星激光科技有限公司 | A kind of isometric light channel structure of laser cutting machine |
| CN107552975A (en) * | 2017-09-28 | 2018-01-09 | 惠州市洛玛科技有限公司 | The method of cutter device and cutting products |
| CN107552966A (en) * | 2017-09-28 | 2018-01-09 | 惠州市洛玛科技有限公司 | Laser mark printing device and product marking method |
| CN109822223A (en) * | 2017-11-23 | 2019-05-31 | 大族激光科技产业集团股份有限公司 | A kind of big width laser labeling method and equipment |
| CN109822223B (en) * | 2017-11-23 | 2021-05-18 | 大族激光科技产业集团股份有限公司 | Large-breadth laser marking method and device |
| CN108581242A (en) * | 2018-01-26 | 2018-09-28 | 广州新可激光设备有限公司 | A kind of energy at laser equipment mark edge enhances optimization method |
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Open date: 20081203 |