CN107234345B - A kind of laser cutting system and its cutting method - Google Patents
A kind of laser cutting system and its cutting method Download PDFInfo
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- CN107234345B CN107234345B CN201710576489.0A CN201710576489A CN107234345B CN 107234345 B CN107234345 B CN 107234345B CN 201710576489 A CN201710576489 A CN 201710576489A CN 107234345 B CN107234345 B CN 107234345B
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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
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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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
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Abstract
The present invention provides a kind of laser cutting system and its laser cutting method, comprising: galvanometer system, variable mirror, stationary mirror, first laser device, second laser and control system, wherein, control system is connect with first laser device, second laser and variable mirror.The cutting mode that the present invention uses cuts for prefocusing mode, existing pole piece cuts the rear focusing cutting mode being all made of, compared to rear focusing, focal beam spot is smaller for prefocusing, and laser power density is bigger at hot spot, it can be improved cutting speed, cooperate three axis galvanometers, cut coverage is big, can be carried out large format cutting and small breadth batch is cut, improve cutting efficiency, save the cost.
Description
Technical field
The invention belongs to technical field of laser processing more particularly to a kind of laser cutting system and its cutting methods.
Background technique
With the diversification of consumer market demand, new energy industry is more and more wellr sold and in short supply.Lithium battery is because it is with high-energy, close
The advantages that degree is big, output power is high, service life cycle is long, non-environmental-pollution, is widely used in automobile, mobile communication equipment
With the industries such as portable electronic device.In Production Process of Lithium Battery, battery pole piece cutting is one of extremely important process, only
Have after cutting coiled battery pole piece, can just be shaped with membrane winding, be made into battery core.
The just extremely aluminium foil of the battery pole piece for the lithium ion that industrial market is widely used at present, cathode are copper foil.Anode
Aluminum foil thickness mostly at 20 μm or so, for the copper thickness of cathode at 12 μm or so, aluminium foil and copper foil two sides respectively have 100 μm or so
Coat.The traditional processing mode of battery pole piece is using conventional processing equipments such as die-cutting machine, banding machines, and this traditional adds
Work mode has abrasion to equipment in process, needs to regularly replace cutting die, and processing cost is higher, meanwhile, battery pole piece
It is unsmooth to will appear crimping, cut surface, jagged equal product defects.Occurs the pole piece of nanosecond optical fiber laser currently on the market
Cutting equipment solves the problems, such as the said goods part mass, since laser processing is noncontact processing, greatly reduces equipment consumption
The cost of material improves processing efficiency, is gradually accepted by battery production manufacturer.
Existing cutting method: pole piece of power battery is that LiFePO4 or cobalt acid iron lithium material are coated uniformly on to copper foil (to bear
Pole) and aluminium foil (anode) two sides, pole piece is then cut by specific shape by cutting equipment.Currently, domestic some lifes
Enterprise is produced mostly using banding machine, cross cutting, punching and rolling cut equipment.When cutting battery pole piece using these equipment, cut out
The pole piece burr come is relatively more, and trimming picking is serious, and dust is more, greatly affected the application of battery pole piece.In addition, these
Cutting die in cutting equipment needs to frequently replace, and is unfavorable for large-scale continuous production, while also increasing the dimension in equipment later period
Cost is protected, this disadvantage seriously limits the production and application of battery pole piece, extends quick service life, increase and be produced into
This, causes to waste, and needs the new cutting equipment of one kind to substitute it.
Optical fiber laser has close to the beam quality of diffraction limit, high-energy conversion efficiency, high stability, almost exempts to tie up
Shield, overlength shelf life and it is small in size the advantages that, have been widely used for laser cutting, welding and the industry manufacture such as mark
Field.For fiber laser device using optical fiber as transmitting medium, laser exports laser after collimating, expanding and focus,
Spot diameter is focused on into dozens of micron even several microns, is well suited for fine cut.Fiber laser device can use
Contactless cutting mode, joint-cutting is narrow, heat affected area is small, trimming is smooth and cutting speed is fast, and plurality of advantages can expire just
The fly-cutting of sufficient battery pole piece and increased quality are the ideal alternate devices of tradition cross cutting and rolling cut equipment.
But since pole piece is made of composite material, usually we are called ' sandwich ' material, the cutting of nanosecond optical-fiber laser
Belong to hot-working, will appear the phenomenon that coat is shunk with nanosecond optical-fiber laser cutting pole piece, the electrode layer meeting among cut portion
There is exposed phenomenon.As power battery capacity is increasing, also higher and higher, such product defects meeting is required to battery pole piece
Security risk is brought to product, burr and dust are easy to pierce through diaphragm, or puncture diaphragm in charge and discharge, cause in battery
Portion's short circuit, fever generate the problems such as high temperature even explodes.
Summary of the invention
Occur that crimping, section are unsmooth, and burr is relatively more, mentions the purpose of the present invention is to provide a kind of solution battery pole piece
The laser cutting system and its cutting method of high processing efficiency.
The present invention provides a kind of laser cutting system comprising: galvanometer system, variable mirror, stationary mirror, first
Laser, second laser and control system, wherein control system with first laser device, second laser and variable anti-
Penetrate mirror connection.
The present invention also provides a kind of laser cutting method, the cutting region of workpiece includes: exposed area, coat, a connection left side
Second transition region of the exposed area and coat on the exposed area of side and the First Transition area of coat and connection right side；Wherein,
First Transition area and the second transition region include and the connection arc section of coat and the equal straightways that connect with exposed area；
Include the following steps:
Step 1: cutting pattern track and the cutting ginseng of first laser device and second laser are set separately in control system
Number；
Variable mirror is made to be in 0 ° of position of level step 2: control system issues signal in advance；Control system control
First laser device issues laser, and laser is cut through coat of the galvanometer system to workpiece；
Step 3: first laser device is cut by laser coat；After cutting terminates, control system issues letter in advance
Number variable mirror is made to be in 45 ° of positions of level；
Step 4: control system control second laser issues laser, laser is anti-through stationary mirror and variable mirror
Being incident upon after galvanometer system to the arc section in the First Transition area of workpiece and coat junction is laser switch starting point, second laser
Device cuts First Transition area using circular arc；
Step 5: after the completion of second laser cuts First Transition area；Second laser jumps cutting and First Transition
The connected exposed area in area, second laser are cut by laser exposed area；
Step 6: after the completion of second laser cutting exposed area；Second laser jumps to second to be connected with exposed area
The straightway of transition region as laser starting point, the arc section of the second transition region and coat handover as laser light off position, until
This completes the laser cutting to battery pole piece.
The present invention also provides a kind of laser cutting method, the cutting region of workpiece includes: exposed area, coat, a connection left side
Second transition region of the exposed area and coat on the exposed area of side and the First Transition area of coat and connection right side；Wherein,
First Transition area and the second transition region include and the connection arc section of coat and the equal straightways that connect with exposed area；
Include the following steps:
Step 1: cutting pattern track and the cutting ginseng of first laser device and second laser are set separately in control system
Number；
Variable mirror is made to be in 0 ° of position of level step 2: control system issues signal in advance；Control system control
First laser device issues laser, and laser is cut through coat of the galvanometer system to workpiece；
Step 3: first laser device is cut by laser coat；After cutting terminates, control system issues letter in advance
Number variable mirror is made to be in 45 ° of positions of level；
Step 4: control system control second laser issues laser, laser is anti-through stationary mirror and variable mirror
Being incident upon after galvanometer system to the arc section of the second transition region of workpiece and coat junction is laser switch starting point, second laser
Device cuts the second transition region using circular arc；
Step 5: after the completion of second laser cuts the second transition region；Second laser jumps cutting and the second transition
The connected exposed area in area, second laser are cut by laser exposed area；
Step 6: after the completion of second laser cutting exposed area；Second laser jumps to first to be connected with exposed area
The straightway of transition region as laser starting point, the arc section of First Transition area and coat handover as laser light off position, until
This completes the laser cutting to battery pole piece.
The cutting mode that the present invention uses cuts for prefocusing mode, the rear focusing cutting that existing pole piece cutting is all made of
Mode, compared to rear focusing, focal beam spot is smaller for prefocusing, and laser power density is bigger at hot spot, can be improved cutting speed,
Cooperate three axis galvanometers, cut coverage is big, can be carried out large format cutting and small breadth batch cut, improve cutting efficiency, save at
This.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of laser cutting system of the present invention；
Fig. 2 is the schematic diagram of present invention cutting workpiece；
Fig. 3 is outer profile cutting track figure of the present invention；
Fig. 4 is the combination diagram of the cutting track of outer profile shown in this Fig. 3.
Specific embodiment
Fig. 1 and Fig. 2 show the structural schematic diagram of laser cutting system of the present invention, this laser cutting system is used for workpiece
2 are cut by laser.
In the present embodiment, workpiece 2 is battery pole piece, and there are three types of situations for battery pole piece: there is painting on the two sides of battery pole piece
Coating, battery pole piece single side have coat, only battery pole piece there is no coat.The cutting technique and cutting ginseng of each case
Number can be different.
As shown in Fig. 2, workpiece 2 includes exposed area 21 and the coat 22 connecting with exposed area 21.
Exposed area 21 is the tab position of battery pole piece, is direct exposed copper foil or aluminium foil；Coat 22 is Fig. 2
Shown in shadow region.
This laser cutting system includes: galvanometer system 1, variable mirror 3, stationary mirror 4, first laser device 5, second
Laser 6 and control system 7, wherein first laser device 5 is 200W nanosecond laser, and second laser 6 is 50W picoseconds and swashs
Light device, control system 7 are connect with first laser device 5, second laser 6 and variable mirror 3.
Wherein, galvanometer system 1 includes X galvanometer, Y galvanometer, scan module and optical reflecting lens, is driven using scan module
Optical mirror slip carries out gauche form movement, and laser is carried out positional dissection according to the specified track of control software.Reflecting mirror 3 is variable
Reflecting mirror, variable mirror 3 have 0 ° and 45 ° of two positions, and the deflection angle of the reflecting mirror 3 is controlled by control system 7.When
When control system 7 gives 5 optical signals of first laser device, signal is issued in advance, variable mirror is made to be in 0 ° of position of level, with
Just first laser device 5 goes out light, and the light that first laser device 5 issues is to galvanometer system 1, X galvanometer and Y galvanometer through galvanometer system 1
Workpiece 2 is cut by laser afterwards.When control system is to 6 optical signals of second laser, signal is issued in advance and can be changed
Reflecting mirror is in 45 ° of positions of level, so that second laser 6 goes out light, the light that second laser 6 issues is through variable mirror 3
To galvanometer system 1, workpiece 2 is cut by laser after the X galvanometer of galvanometer system 1 and Y galvanometer.
Stationary mirror 4 is to fix 45 ° of reflecting mirrors, which is swashing for the sending of reflected second laser device 6
Light is combined with variable mirror 3 so that first laser device 5 and the laser of the sending of second laser 6 are in same optical path, to protect
Card is applied on workpiece in the same position.
Since battery pole piece 2 has band coat and the case where without coat, in nanosecond optical fiber laser cutting technique, receive
The cutting of second optical-fiber laser belongs to hot-working, with meeting when the battery pole piece of traditional nanosecond optical fiber laser cutting technique cutting belt coat
There is the phenomenon that coat is shunk, the electrode layer among cut portion has exposed phenomenon, and such product defects can give product
Bring security risk.So obtaining relatively good cutting effect by optimization nanosecond laser technological parameter.In addition, with first
Laser 5 cuts the pole piece (such as: tab) without coat, and laser acts directly in the ear of battery pole piece, can be easy to
Cause crimping, cut surface unsmooth, jagged equal product defects.Because the ear of battery pole piece is copper foil or aluminium foil, without phosphorus
Sour iron lithium or cobalt acid iron lithium coat, are mainly used for battery charging and discharging, relative to the part for having coat, ear is to laser
Absorptivity can be lower.So the tab position of battery pole piece is cut in selection with second laser 6.
Second laser 6 is picosecond laser, when cutting the pole piece without coat such as tab, is individually cut, then match
The pole piece and reasonable technological parameter for closing 5 cutting belt coat of first laser device, improve cutting effect, notch is whole well
Together, basic impulse- free robustness and edge-curl phenomenon.
Control system 7 is used to control the switch light of first laser device 5 and second laser 6 for control system and can be changed anti-
Penetrate the position of mirror 3.
Fig. 3 show the path schematic diagram of laser cut workpieces, and cutting region includes: exposed area 21, coat 22, connection
The second of the exposed area 21 and coat 22 on the exposed area 21 in left side and the First Transition area 23 of coat 22 and connection right side
Transition region 24.Wherein, First Transition area 23 and the second transition region 24 include with the connection arc section of coat 22 and with
The straightway that exposed area 21 connects, arc section are connected with corresponding straightway.
Since tab position (exposed area 21) and 22 cutting parameter of coat are different, as shown in figure 4, whole figure
Be divided into four parts, different parameters is used to be cut: exposed area 21 is as a sections, and First Transition area 23 is as b1 sections, the
Two transition regions 24 are used as c sections as b2 sections, coat 22.
The left side of coat 22 is arranged in the b1 section in setting First Transition area 23, and the b2 section setting of the second transition region 24 is applying
The right side of coating 22.
Cutting sequence are as follows: c-b1-a-b2: c sections first are cut with nanosecond laser 5: since c sections of left sides are laser starting point
Out for light, then arrive at c sections of right side extended lines as laser light off point；It jumps to again and right side c sections of laser light off point extended line
On the b1 elongated segment line of junction, b1 sections of junction circular arc extended lines are laser switch starting point, are cut with picosecond laser 6
It cuts.B1 sections are cut, jumps a section that cutting is connected with b1 straight line, a sections of laser cutting terminates, then jumps to the b2 section being attached thereto
As laser starting point at straight line, b2 sections of circular arc junction extended lines are laser light off position, and so far whole figure cutting finishes.This
It is complete pole piece laser cutting sequence.
Conversely, from c sections of right sides be that laser starting point of opening the light is also possible, i.e. cutting sequence are as follows: c-b2-a-b1:.For a,
Tetra- positions b1, b2, c, are cut with different laser and cutting parameter.
The present invention also provides a kind of laser cutting methods to include the following steps: when exposed area 21 is copper foil
Step 1: the cutting pattern track of first laser device 5 and second laser 6 is set separately in control system 7 and cuts
Cut parameter；
Variable mirror 3 is made to be in 0 ° of position of level step 2: control system 7 issues signal in advance；Control system 7 is controlled
First laser device 5 processed issues laser, and laser is cut through coat 22 of the galvanometer system 1 to workpiece；
Laser is to the specific cutting sequence of coat 22 are as follows: start light out by laser starting point of the left side of coat 22 first,
Then it arrives at the right side extended line of coat 22 as laser light off point, completes the laser cutting to coat 22.
Step 3: first laser device 5 is cut by laser coat 22；After cutting terminates, control system 7 is sent out in advance
Signal makes variable mirror 3 be in 45 ° of positions of level out；
Step 4: control system 7, which controls second laser 6, issues laser, laser is through stationary mirror 4 and variable mirror
3 to reflex to after galvanometer system 1 be laser switch starting point to the arc section in the First Transition area 23 of workpiece and 22 junction of coat,
Second laser 6 cuts First Transition area 23 using circular arc；
Laser is to the specific cutting sequence in First Transition area 23 are as follows: second laser 6 jumps to sharp with 22 right side of coat
Light closes the junction of luminous point extended line and 23 extended line of First Transition area, the arc section in First Transition area 23 and prolonging for coat 22
Long line junction is cut by laser First Transition area 23 as laser switch starting point, second laser 6.
Step 5: after the completion of second laser 6 cuts First Transition area 23；Second laser 6 jumps cutting and first
The connected exposed area 21 of transition region 23, second laser 6 are cut by laser exposed area 21；
Step 6: after the completion of the cutting of second laser 6 exposed area 21；Second laser 6 is jumped to be connected with exposed area 21
The second transition region 24 straightway as laser starting point, the arc section that the second transition region 24 joins with coat 22 is as laser
Optical position is closed, the laser cutting to battery pole piece is so far completed.
The present invention also provides a kind of laser cutting methods to include the following steps: when exposed area 21 is copper foil
Step 1: the cutting pattern track of first laser device 5 and second laser 6 is set separately in control system 7 and cuts
Cut parameter；
Variable mirror 3 is made to be in 0 ° of position of level step 2: control system 7 issues signal in advance；Control system 7 is controlled
First laser device 5 processed issues laser, and laser is cut through coat 22 of the galvanometer system 1 to workpiece；
Laser is to the specific cutting sequence of coat 22 are as follows: start light out by laser starting point of the right side of coat 22 first,
Then it arrives at the left side extended line of coat 22 as laser light off point, completes the laser cutting to coat 22.
Step 3: first laser device 5 is cut by laser coat 22；Control system 7 is sent out in advance after cutting terminates
Signal makes variable mirror 3 be in 45 ° of positions of level out；
Step 4: control system 7, which controls second laser 6, issues laser, laser is through stationary mirror 4 and variable mirror
3 to reflex to after galvanometer system 1 be laser switch starting point to the arc section of the second transition region 24 of workpiece and 22 junction of coat,
Second laser 6 cuts the second transition region 24 using circular arc；
Laser is to the specific cutting sequence of the second transition region 24 are as follows: second laser 6 jumps to sharp with 22 left side of coat
Light closes the junction of luminous point extended line and 24 extended line of the second transition region, the second arc section of transition region 24 and prolonging for coat 22
Long line junction is cut by laser the second transition region 24 as laser switch starting point, second laser 6.
Step 5: after the completion of second laser 6 cuts the second transition region 24；Second laser 6 jumps cutting and second
The connected exposed area 21 of transition region 24, second laser 6 are cut by laser exposed area 21；
Step 6: after the completion of the cutting of second laser 6 exposed area 21；Second laser 6 is jumped to be connected with exposed area 21
First Transition area 23 straightway as laser starting point, the arc section that First Transition area 23 and coat 22 join is as laser
Optical position is closed, the laser cutting to battery pole piece is so far completed.
It is identical as the cutting method of copper foil when exposed area 21 is aluminium foil, it is all using twin-laser system, cutting drawing
Shape is also the same, the difference is that the difference of cutting parameter, specific as follows shown:
Laser technical parameters explanation:
Cutting speed: the speed that galvanometer is run when cutting, speed is faster, and laser pulse residence time is shorter, and heat dissipates
Hair is faster, conversely, speed is slower, laser residence action time is longer, and heat build-up is not easy to distribute.
Empty hop rate degree: laser does not go out light, the speed of galvanometer operation when completing empty jump movement.
Laser Q frequency: referring to the umber of pulse of pulse laser sending per second, and under same time, frequency is higher, single pulse energy
Measure smaller, the destructive power of laser is also smaller, and laser is mainly reflected in thermal energy at this time.
Pulse width: referring to single pulse duration, and pulse width is smaller, and the laser duration is shorter, peak work
Rate is higher, and the destructive power of laser is bigger.Conversely, pulse width is bigger, the laser duration is longer, and peak power is lower, laser
It is mainly reflected in thermal energy.
Laser power: the output power of laser.
It opens the light delay: the regulating time that laser starting point is combined with galvanometer movement starting point, galvanometer system before laser opens the light
In advance or time for delaying.
Guan Guang delay: laser tail point is moved into the regulating time that tail point combines with galvanometer, galvanometer shifts to an earlier date before laser light off
Or the time delayed.
It turns round and is delayed: in graphics track corner, galvanometer being made to move to the regulating time of curve in place.
It jumps delay: after sky is jumped, galvanometer being made to move to static regulating time in place.
The thickness and reflectivity of aluminium foil and copper foil in positive/negative plate, there are also the thickness of coat differences.Cutting used
Technological parameter is different.
When exposed area 21 is aluminium foil, the parameter of laser cutting such as table 1:
When 1 exposed area of table is aluminium foil, the parameter of laser cutting
When exposed area 21 is copper foil, the parameter of laser cutting such as table 2:
When 2 exposed area of table is copper foil, the parameter of laser cutting
The present invention is shorter since First Transition area 23 and the second transition region 24 join arc section with coat 22 respectively, if
It, can be because the delay of switch light, the turn of second laser 6, which are delayed and jump delay, be caused cutting effect very using right angle cuts
Difference, or even the case where cut to get off, so right angle is changed to circular arc cutting, and extend cutting line, allow for cutting in this way
When, laser, which is cut, to close light when coat 22 jumps to First Transition area 23 or the second transition region 24 a little later and is jumping to exposed area
It earlier opens the light when 21, and then solves the above problem.
Right angle is changed to circular arc cutting by the present invention, and extends cutting line, and being intended to explanation is made due to extending cutting line
Go out optical track mark (i.e. the cutting pattern) of laser is able to extend or shorten, and the morning and evening for switching light is by extending or shortening cutting pattern
Extended line at delivery position is delayed to obtain come what is obtained rather than just by laser switch light；Because if simply by
The delay of laser switch light come if controlling laser switch light, get up more troublesome by parameter regulation, needs to make repeated attempts to match and cut
Cut figure and other cutting parameters.And if slightly changed from figure, so that it may the adjustment being much less in parameter, from
And reduce technological parameter debugging difficulty.
The adjustment of figure of the present invention is exactly " right angle cuts are changed to circular arc cutting, and extend cutting line ", and here it is paintings
The position in coating 22 and First Transition area 23 and the handover of the second transition region 24, two parts can extend one section, coat in fact
Layer 22 and 21 junction of exposed area are also to have extended line, and only figure is overlapped, without coat 22 and First Transition area 23 and the
The handover handover of two transition regions 24 is seen intuitive.Because extending part out, laser will be than not prolonging if extending cutting line in this way
The long light that has more is a bit of, this is equivalent to laser and earlier goes out light, closes light a little later.C sections are cut, when jumping to b sections, junction b
Section circular arc extended line also extends a part, and the position of Laser output, has more when this is from coat 22 to First Transition area 23
One section is just comparable to laser and goes out light in advance.Processing is it is ensured that be not in the difference between each section due to cutting parameter in this way
And the phenomenon that causing pole piece to be cut to fall.And the laser in parameter open the light delay and close light delay be for debug different materials cutting
When cutting effect and laser cutting speed, Q frequency etc. match, thus the cutting effect got well.
So when cutting aluminium foil and copper foil, laser switch light delay different from used, exposed area and first when cutting aluminium foil
Transition region 23 and the second transition region 24 switch light delay be all 0, this is because with other cutting parameters match as a result, not being
It says that this part does not open the light in advance and postpones to close light when cutting aluminium foil, but is realized by extended line and open the light and postpone to close light in advance.
About the length of extended line, can be obtained according to extension line length and cutting speed required for cutting this elongated segment line
Time t, this time t is greater than the time of laser switch light delay, but cannot be too long, will affect cutting efficiency.
Be exactly in brief, laser switch light delay, be for ensuring that cutting cutting effect and laser cutting speed, Q
Frequency etc. matches, thus the cutting effect got well.And extend the cutting line of each junction, it is to guarantee
Pole piece can completely be cut down.If not extending cutting line, in different sections of junction switched laser devices and parameter, due to
The latency issue of laser, it may appear that the phenomenon that pole piece cannot be cut away completely appearance.
The cutting mode that the present invention uses cuts for prefocusing mode (that is: before condenser lens is mounted on galvanometer system, to be gathered
Focus lens are placed in beam expanding lens and galvanometer system middle position, and such cutting mode laser is completed to focus when not passing through galvanometer,
Optical track mark is then controlled out by galvanometer system again, the sphere of action of large format can be obtained), it is all made of with the cutting of existing pole piece
Rear focusing cutting mode (that is: condenser lens is mounted on after scanning galvanometer, and laser is by being applied directly to after condenser lens
On workpiece), compared to rear focusing, focal beam spot is smaller for prefocusing, and laser power density is bigger at hot spot, can be improved cutting speed
Degree cooperates three axis galvanometers, and cut coverage is big, can be carried out large format cutting and small breadth batch is cut, improve cutting efficiency, save
Cost.
The present invention is cut using nanosecond+picosecond twin-laser same light path according to the case where battery pole piece coat, and is cut
Mode is cut to cut using prefocusing mode.Prefocusing is compared to existing rear focusing cutting mode, and focal beam spot is smaller, light
Laser power density is bigger at spot, can be improved cutting speed, cooperates three axis galvanometers, cut coverage is big, can be carried out large format and cuts
It cuts and is cut with small breadth batch, improve cutting efficiency, save the cost.And picosecond laser solves nanosecond laser and is cutting
Without coat pole piece when be easy to the phenomenon that defect occur, then cooperate reasonable technological parameter, improve cutting well
Effect, notch is neat, basic impulse- free robustness and edge-curl phenomenon.
The preferred embodiment of the present invention has been described above in detail, but during present invention is not limited to the embodiments described above
Detail can carry out a variety of equivalents to technical solution of the present invention within the scope of the technical concept of the present invention, these
Equivalents all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of laser cutting method, the cutting region of workpiece includes: exposed area, coat, the exposed area in connection left side and painting
Second transition region in the First Transition area of coating and the exposed area on connection right side and coat；Wherein, First Transition area and
Two transition regions include and the connection arc section of coat and the equal straightways that connect with exposed area；It is characterised in that it includes
Following steps:
Step 1: cutting pattern track and the cutting parameter of first laser device and second laser are set separately in control system；
Variable mirror is made to be in 0 ° of position of level step 2: control system issues signal in advance；Control system control first
Laser issues laser, and laser is cut through coat of the galvanometer system to workpiece；
Step 3: first laser device is cut by laser coat；After cutting terminates, control system issues signal in advance to be made
It obtains variable mirror and is in 45 ° of positions of level；
Step 4: control system control second laser issues laser, laser is reflexed to through stationary mirror and variable mirror
It is laser switch starting point, second laser pair to the arc section in the First Transition area of workpiece and coat junction after galvanometer system
It is cut using circular arc in First Transition area；
Step 5: after the completion of second laser cuts First Transition area；Second laser jumps cutting and First Transition area phase
Exposed area even, second laser are cut by laser exposed area；
Step 6: after the completion of second laser cutting exposed area；Second laser jumps to the second transition being connected with exposed area
For the straightway in area as laser starting point, the arc section that the second transition region joins with coat is so far complete as laser light off position
The laser cutting of battery pair pole piece.
2. laser cutting method according to claim 1, it is characterised in that: the laser of the second step is specific to coat
Cutting sequence are as follows: start light out by laser starting point of the left side of coat first, then arrive at the right side extended line of coat and be
Laser light off point completes the laser cutting to coat.
3. laser cutting method according to claim 1, it is characterised in that: laser is to the specific cutting sequence in First Transition area
Are as follows: second laser jumps to the junction with laser light off point extended line and First Transition area extended line on the right side of coat,
The arc section in First Transition area and the extended line junction of coat are as laser switch starting point, and second laser is to First Transition
Area is cut by laser.
4. a kind of laser cutting method, the cutting region of workpiece includes: exposed area, coat, the exposed area in connection left side and painting
Second transition region in the First Transition area of coating and the exposed area on connection right side and coat；Wherein, First Transition area and
Two transition regions include and the connection arc section of coat and the equal straightways that connect with exposed area；It is characterised in that it includes
Following steps:
Step 1: cutting pattern track and the cutting parameter of first laser device and second laser are set separately in control system；
Variable mirror is made to be in 0 ° of position of level step 2: control system issues signal in advance；Control system control first
Laser issues laser, and laser is cut through coat of the galvanometer system to workpiece；
Step 3: first laser device is cut by laser coat；After cutting terminates, control system issues signal in advance to be made
It obtains variable mirror and is in 45 ° of positions of level；
Step 4: control system control second laser issues laser, laser is reflexed to through stationary mirror and variable mirror
It is laser switch starting point, second laser pair to the arc section of the second transition region of workpiece and coat junction after galvanometer system
Second transition region is cut using circular arc；
Step 5: after the completion of second laser cuts the second transition region；Second laser jumps cutting and the second transition region phase
Exposed area even, second laser are cut by laser exposed area；
Step 6: after the completion of second laser cutting exposed area；Second laser jumps to the First Transition being connected with exposed area
For the straightway in area as laser starting point, the arc section that First Transition area joins with coat is so far complete as laser light off position
The laser cutting of battery pair pole piece.
5. laser cutting method according to claim 4, it is characterised in that: the laser of the second step is specific to coat
Cutting sequence are as follows: start light out by laser starting point of the right side of coat first, then arrive at the left side extended line of coat and be
Laser light off point completes the laser cutting to coat.
6. laser cutting method according to claim 4, it is characterised in that: laser is to the specific cutting sequence of the second transition region
Are as follows: second laser jumps to the junction with laser light off point extended line and the second transition region extended line on the left of coat,
The arc section of second transition region and the extended line junction of coat are as laser switch starting point, and second laser is to the second transition
Area is cut by laser.
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| CN107931861A (en) * | 2017-11-30 | 2018-04-20 | 大族激光科技产业集团股份有限公司 | Laser cutting machine |
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