CN107009023B - A kind of focus control and its focus adjustment method adjusting laser focal - Google Patents
A kind of focus control and its focus adjustment method adjusting laser focal Download PDFInfo
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- CN107009023B CN107009023B CN201710391263.3A CN201710391263A CN107009023B CN 107009023 B CN107009023 B CN 107009023B CN 201710391263 A CN201710391263 A CN 201710391263A CN 107009023 B CN107009023 B CN 107009023B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 43
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 238000003698 laser cutting Methods 0.000 claims description 14
- 238000012887 quadratic function Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 10
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
Classifications
-
- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a kind of focus controls for adjusting laser focal, it includes automatic production line, pedestal, laser measurement mechanism, sample position switching mechanism, laser occurs and focus regulating mechanism, the pedestal is located at the side of automatic production line, and the laser measurement mechanism, sample position switching mechanism, laser occur and focus regulating mechanism is set gradually on the base；The laser occurs and focus regulating mechanism includes Z axis bracket, X-axis telescopic rod, laser lens, and one end of the X-axis telescopic rod is flexibly connected with Z axis bracket, and the laser lens are located at the other end of X-axis telescopic rod and are located above automatic production line；A kind of focus adjustment method is also disclosed, repeatedly mobile focal length carries out sample cutting through the invention, improves the precision of Focussing；Focussing mode does not need contact cutting material, does not influence cutting material use, Focussing mode is safe and reliable, and structure is easily designed and builds.
Description
Technical field
The invention belongs to laser cutting technique fields, and in particular to it is a kind of adjust laser focal focus control and its focusing
Method.
Background technique
Laser cutting can be improved production capacity, and cut quality is high, and meaning is very great in the industrial production, laser cutting machine
Before being cut, it is necessary to the focal length of laser and cutting material is first adjusted, once laser focal adjusts bad, laser energy
Amount will be unable to concentrate in the tiny area on cutting material surface, insufficient so as to cause depth of cut, and the cutting matter of incision
It measures bad；Therefore, the adjustment for being cut by laser focal length is most important for laser cutting.
Summary of the invention
In view of this, the main purpose of the present invention is to provide a kind of focus control for adjusting laser focal and its focusing sides
Method is able to solve technical problem caused by the variation of laser cutting process mid-focal length.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
The embodiment of the present invention provides a kind of focus control for adjusting laser focal comprising automatic production line, pedestal, laser
Measuring mechanism, sample position switching mechanism, laser occur and focus regulating mechanism, the pedestal are located at the one of automatic production line
Side, the laser measurement mechanism, sample position switching mechanism, laser occur and focus regulating mechanism is set gradually on the base；
The laser occurs and focus regulating mechanism includes Z axis bracket, X-axis telescopic rod, laser lens, one end of the X-axis telescopic rod
It is flexibly connected with Z axis bracket, the laser lens are located at the other end of X-axis telescopic rod and are located above automatic production line.
In above scheme, the sample position switching mechanism includes lead screw, measuring rod, specimen holder, light source, and the lead screw hangs down
Straight setting is on the base and lower end is connect with driving motor, and one end of the measuring rod is set on lead screw, other end setting
Specimen holder, the light source are located at the side of specimen holder；It is sharp that the measuring rod drives the sample or so being located on specimen holder to be switched to
The position of flash ranging measuring mechanism or sample position switching mechanism, while laser focal adjustment is also realized by height adjustment.
In above scheme, the sample clamp for clamping sample is provided on the specimen holder.
In above scheme, the laser measurement mechanism includes measurement seat, projection screen, CCD camera, and the measurement seat hangs down
Face setting projection screen directly, any side in left and right on specimen holder and being located at light source is arranged in the CCD camera, described
CCD camera is oppositely arranged with projection screen.
In above scheme, the laser measurement mechanism includes measurement seat, projection screen, photosensitive sensor, the measurement seat
Vertical plane on projection screen is set, photosensitive sensor is arranged in the back of the projection screen.
The embodiment of the present invention also provides a kind of focus adjustment method of laser focal, and this method is realized by following steps:
Step 1: the focus control as described in above scheme is in laser cutting process, at regular intervals, will measure
Bar moves axially to setting position, and turns to immediately below laser lens, then cuts to sample；
Step 2: after the completion of sample cutting, traverse measurement bar turns to measuring rod in front of measurement seat, opens light source, right
Sample projection on projection screen carries out depth measurement, obtains current depth；
Step 3: if current depth has reached the depth that pinpointed focus is cut, continue laser cutting and turn
To step 5；, whereas if current depth is not up to the depth that pinpointed focus is cut, then the adjustment of focal length is carried out, into step
Rapid four.
Step 4: after determining focal length height according to current depth, sample position switching mechanism is on current Z axis height basis
On, it is moved towards Z axis towards pedestal direction, carries out sample cutting every a distance, or move backwards to pedestal direction towards Z axis,
Sample cutting is carried out every a distance；
Step 5: after completing focometry and Focussing, measuring rod is moved to original position, laser is then proceeded by and cuts
It cuts.
In above scheme, the sample projection on projection screen carries out depth measurement, obtains current depth, specifically
Are as follows: to sample cut n times, to n times depth of cut carry out image measurement sampling, obtain each depth data Li (i=1 ...,
N), and according to each depth data Li establish depth array.
It is described that focal length height is determined according to current depth in above scheme, specifically: place is filtered to depth data Li
After reason, then quadratic function process of fitting treatment is carried out to depth data Li and obtains curvilinear function F (x)=ax2+ bx+c, according to curve letter
Number F (x)=ax2+ bx+c determines most deep depth of cut Lmax, and will most deep depth of cut LmaxCorresponding Z axis coordinate is as burnt
Away from height.
In above scheme, as the curvilinear function F (x)=ax2+ bx+c determines that the depth trend of cutting is monotonic increase
When, the depth data Ln for taking n-th to cut is focal length height；The curvilinear function F (x)=ax2+ bx+c determines the depth of cutting
When trend is monotone decreasing, taking the depth data L1 of the 1st cutting is focal length height.
In above scheme, as the curvilinear function F (x)=ax2+ bx+c determines that the depth trend of cutting is first to increase to subtract afterwards
When, extreme value x=x is taken to the solution of curvilinear function F'(x)=0max；Then it is compared in depth array, obtains a times cutting
Depth data La,La+1, 1 < a < n-1, so that La< Lxmax< La+1；IfSo take Lmax=
La+1；IfSo take Lmax=La；To acquire depth capacity point Lmax,1≤max≤n。
Compared with prior art, the present invention occurs in laser and focus regulating mechanism is to the cutting on automatic production line
In material cutting process, the sample position switching mechanism is periodically transferred under laser generation and focus regulating mechanism to sample
Product are cut, and are being transferred to the progress depth measurement of laser measurement mechanism later, if depth measurement is qualified, the laser hair
Raw and focus regulating mechanism continues to cut to cutting material, and the on the contrary then described laser occurs and focus regulating mechanism focusing carries out
It is further continued for cutting after adjustment, in this way, carrying out sample cutting by repeatedly moving focal length, improves the precision of Focussing；Focal length
Adjustment mode does not need contact cutting material, does not influence cutting material use, Focussing mode is safe and reliable, and structure is easy
In designing and build.
Detailed description of the invention
Fig. 1 provides a kind of structural schematic diagram of focus control for adjusting laser focal for the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of focus control for adjusting laser focal, as shown in Figure 1 comprising automatic production line
1, pedestal 2, laser measurement mechanism 3, sample position switching mechanism 4, laser occur and focus regulating mechanism 5, the pedestal 2 are located at
The side of automatic production line 1, the laser measurement mechanism 3, sample position switching mechanism 4, laser occurs and focus regulating mechanism 5
It sets gradually on the base 2；The laser occurs and focus regulating mechanism 5 includes Z axis bracket 51, X-axis telescopic rod 52, laser mirror
First 53, one end of the X-axis telescopic rod 52 is flexibly connected with Z axis bracket 51, and the laser lens 53 are located at X-axis telescopic rod 52
The other end and it is located at the top of automatic production line 1, in this way, occurring in laser and focus regulating mechanism 5 is to being located at automatic production line 1
On cutting material cutting process in, the sample position switching mechanism 4 be periodically transferred to laser occur and Focussing
Sample is cut under mechanism 5, laser measurement mechanism 3 is transferred to later and carries out depth measurement, if depth measurement is qualified,
Then the laser occurs and focus regulating mechanism 5 continues to cut to cutting material, and the on the contrary then described laser occurs and Focussing
5 focusing of mechanism is further continued for cutting after being adjusted.
Specifically, the laser occurs and the X-axis telescopic rod 52 of focus regulating mechanism 5 is for cutting movement, Z axis bracket 51
For Focussing.
The sample position switching mechanism 4 includes lead screw 41, measuring rod 42, specimen holder 43, light source 44, and the lead screw 41 hangs down
Straight setting is on pedestal 1 and lower end is connect with driving motor, and one end of the measuring rod 42 is set on lead screw 41, the other end
Specimen holder 43 is set, and the light source 44 is located at the side of specimen holder 43；The measuring rod 42 drives the sample being located on specimen holder 43
Product or so are switched to the position of laser measurement mechanism 3 or sample position switching mechanism 4, while also realizing laser by height adjustment
Focussing.
The sample clamp 431 for clamping sample is provided on the specimen holder 43, thus it is ensured that sample is firm.
Further, the laser measurement mechanism 3 includes measurement seat 31, projection screen 32, CCD camera, the measurement seat
Projection screen 32 is set on 31 vertical plane, and the left and right times on specimen holder 43 and being located at light source 44 is arranged in the CCD camera
Meaning side, the CCD camera are oppositely arranged with projection screen 32.
Optionally, the laser measurement mechanism 3 includes measurement seat 31, projection screen 32, photosensitive sensor, the measurement seat
Projection screen 32 is set on 31 vertical plane, and photosensitive sensor is arranged in the back of the projection screen 32.
The course of work of the invention:
Step1. equipment initializes:
Equipment is powered, and parameter is set as initial parameter.
Step2. focometry:
The laser occurs and focus regulating mechanism 5 is in laser cutting process, at regular intervals, the sample position
Measuring rod 42 is moved axially to setting position by lead screw 41 by switching mechanism 4, and is turned to immediately below laser lens 53, then
Carry out sample cutting.
After the completion of sample cutting, then by 41 traverse measurement bar 42 of lead screw, measuring rod 42 is turned into 31 front of measurement seat,
Light source 44 is opened, depth measurement is carried out to the sample projection on projection screen 32.
If depth, which is calculated, has reached the depth that pinpointed focus is cut, continue to be cut by laser, enter
Step4。
If carrying out the adjustment of focal length if depth, which is calculated, is not up to the depth that pinpointed focus is cut, enter
Step3。
Step3. focal length is adjusted:
On the basis of the present level of Z axis bracket 51, moved towards Z axis bracket 51 towards 2 direction of pedestal, at a certain distance
Sample cutting is carried out, or is moved towards Z axis bracket 51 backwards to 2 direction of pedestal, carries out sample cutting at a certain distance.
Then carry out focometry according to step2, will the corresponding Z axis coordinate of most deep depth of cut as focal length height, and
Z axis bracket 51 is moved to the focal length height.
Step4. it is cut by laser:
After completing focometry and Focussing, measuring rod 42 is moved to original position, then proceeds by laser cutting.
The embodiment of the present invention also provides a kind of focus adjustment method for adjusting laser focal, and this method passes through following steps reality
It is existing:
Step 1: focus control is in laser cutting process, at regular intervals, measuring rod is moved axially to setting position
It sets, and turns to immediately below laser lens, then sample is cut；
Step 2: after the completion of sample cutting, traverse measurement bar turns to measuring rod in front of measurement seat, opens light source, right
Sample projection on projection screen carries out depth measurement, obtains current depth；
Step 3: if current depth has reached the depth that pinpointed focus is cut, continue laser cutting and turn
To step 5；, whereas if current depth is not up to the depth that pinpointed focus is cut, then the adjustment of focal length is carried out, into step
Rapid four.
Step 4: after determining focal length height according to current depth, sample position switching mechanism is on current Z axis height basis
On, it is moved towards Z axis towards pedestal direction, carries out sample cutting every a distance, or move backwards to pedestal direction towards Z axis,
Sample cutting is carried out every a distance；
Step 5: after completing focometry and Focussing, measuring rod is moved to original position, laser is then proceeded by and cuts
It cuts.
Specifically, the sample projection on projection screen carries out depth measurement, obtains current depth, specifically: it is right
Sample cuts n times, carries out image measurement sampling to n times depth of cut, obtains each depth data Li (i=1 ..., n), and
Depth array is established according to each depth data Li.
It is described that focal length height is determined according to current depth, specifically: after being filtered to depth data Li, then to depth
Degree carries out quadratic function process of fitting treatment according to Li and obtains curvilinear function F (x)=ax2+ bx+c, according to curvilinear function F (x)=ax2+
Bx+c determines most deep depth of cut Lmax, and will most deep depth of cut LmaxCorresponding Z axis coordinate is as focal length height.
As the curvilinear function F (x)=ax2When+bx+c determines that the depth trend of cutting is monotonic increase, n-th is taken to cut
The depth data Ln cut is focal length height；The curvilinear function F (x)=ax2+ bx+c determines that the depth trend of cutting is passed for dullness
When subtracting, taking the depth data L1 of the 1st cutting is focal length height.
As the curvilinear function F (x)=ax2+ bx+c determines that the depth trend of cutting is when first increasing to subtract afterwards, to curvilinear function
F'(x it)=0 solves and takes extreme value x=xmax；Then it is compared in depth array, obtains the depth data L of a times cuttinga,
La+1, 1 < a < n-1, so that La< Lxmax< La+1；IfSo take Lmax=La+1；IfSo take Lmax=La；To acquire depth capacity point Lmax,1≤max≤n。
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (5)
1. a kind of focus adjustment method of laser focal, the focus control for adjusting laser focal includes automatic production line, pedestal, swashs
Flash ranging measuring mechanism, sample position switching mechanism, laser occur and focus regulating mechanism, the pedestal are located at the one of automatic production line
Side, the laser measurement mechanism, sample position switching mechanism, laser occur and focus regulating mechanism is set gradually on the base；
The laser occurs and focus regulating mechanism includes Z axis bracket, X-axis telescopic rod, laser lens, one end of the X-axis telescopic rod
It being flexibly connected with Z axis bracket, the laser lens are located at the other end of X-axis telescopic rod and are located above automatic production line,
It is characterized in that, this method is realized by following steps:
Step 1: the focus control is in laser cutting process, and at regular intervals, measuring rod is axially moveable to setting
Position, and turn to immediately below laser lens, then sample is cut；
Step 2: after the completion of sample cutting, measuring rod is turned in front of measurement seat, light source is opened, to projection by traverse measurement bar
Sample projection on screen carries out depth measurement, obtains current depth；
Step 3: if current depth has reached the depth that pinpointed focus is cut, continue laser cutting and go to step
Rapid five；, whereas if current depth is not up to the depth that pinpointed focus is cut, then the adjustment of focal length is carried out, enters step four；
Step 4: after determining focal length height according to current depth, sample position switching mechanism on the basis of current Z axis height,
It is moved towards Z axis towards pedestal direction, carries out sample cutting every a distance, or move backwards to pedestal direction towards Z axis, every
A distance carries out sample cutting；
Step 5: after completing focometry and Focussing, measuring rod is moved to original position, then proceeds by laser cutting.
2. a kind of focus adjustment method of laser focal according to claim 1, which is characterized in that described on projection screen
Sample projection carries out depth measurement, obtains current depth, specifically: n times are cut to sample, image is carried out to n times depth of cut
Measurement sampling, obtains each depth data Li (i=1 ..., n), and establish depth array according to each depth data Li.
3. a kind of focus adjustment method of laser focal according to claim 1 or 2, which is characterized in that the basis is currently deep
It spends and determines focal length height, specifically: after being filtered to depth data Li, then quadratic function is carried out to depth data Li and is intended
Conjunction handles to obtain curvilinear function F (x)=ax2+ bx+c, according to curvilinear function F (x)=ax2+ bx+c determines most deep depth of cut
Lmax, and will most deep depth of cut LmaxCorresponding Z axis coordinate is as focal length height.
4. a kind of focus adjustment method of laser focal according to claim 3, which is characterized in that when the curvilinear function F (x)
=ax2When+bx+c determines that the depth trend of cutting is monotonic increase, the depth data Ln for taking n-th to cut is focal length height；Institute
State curvilinear function F (x)=ax2When+bx+c determines that the depth trend of cutting is monotone decreasing, the depth data of the 1st cutting is taken
L1 is focal length height.
5. a kind of focus adjustment method of laser focal according to claim 4, which is characterized in that when the curvilinear function F (x)
=ax2+ bx+c determines that the depth trend of cutting is to take extreme value x=x to the solution of curvilinear function F'(x)=0 when first increasing to subtract afterwardsmax；
Then it is compared in depth array, obtains the depth data L of a times cuttinga,La+1, 1 < a < n-1, so that La< Lxmax
< La+1；IfSo take Lmax=La+1；IfSo take Lmax=La；To
Acquire depth capacity point Lmax,1≤max≤n。
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| CN107322168A (en) * | 2017-08-24 | 2017-11-07 | 安徽华生机电设备有限公司 | Automatic focusing is away from laser marking machine |
| CN107716468A (en) * | 2017-10-31 | 2018-02-23 | 广东工业大学 | A kind of laser auto focusing method, system, device and readable storage medium storing program for executing |
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| DE102015108248A1 (en) * | 2015-05-26 | 2016-12-01 | Scanlab Ag | Laser material processing system and method for adjusting the size and position of a laser focus |
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|---|---|---|---|---|
| KR20140010197A (en) * | 2014-01-15 | 2014-01-23 | 제일엠텍(주) | Apparatus for laser marking with function of automatic regulation of focus |
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- 2017-05-27 CN CN201710391263.3A patent/CN107009023B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101670715A (en) * | 2009-09-23 | 2010-03-17 | 上海市激光技术研究所 | Tire laser marking device and method based on machine vision identity |
| DE102015108248A1 (en) * | 2015-05-26 | 2016-12-01 | Scanlab Ag | Laser material processing system and method for adjusting the size and position of a laser focus |
| CN205311080U (en) * | 2016-01-06 | 2016-06-15 | 武汉华工激光工程有限责任公司 | A laser marking device for outer machine of air conditioner |
| CN205705768U (en) * | 2016-05-05 | 2016-11-23 | 上海眸特实业有限公司 | Based on CCD detection have focal length self-tuning laser marking instrument |
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