CN114406500A - Laser cutting method for ferrite composite material - Google Patents
Laser cutting method for ferrite composite material Download PDFInfo
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- CN114406500A CN114406500A CN202210202130.8A CN202210202130A CN114406500A CN 114406500 A CN114406500 A CN 114406500A CN 202210202130 A CN202210202130 A CN 202210202130A CN 114406500 A CN114406500 A CN 114406500A
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- composite material
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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
Abstract
The invention discloses a laser cutting method of a ferrite composite material, which comprises the following steps: firstly, installing a ferrite composite material to ensure that a protective layer is cut preferentially; secondly, emitting laser and focusing to obtain a focused beam, and controlling the focused beam to form a focus on the surface of the ferrite composite material; and thirdly, controlling the focused light beam to move along a set track, and intermittently and repeatedly scanning the ferrite composite material until the cutting is finished. The invention overcomes the defect that the complex-shaped ferrite composite material is easy to generate brittle damage in the cutting process, the focused light beam cuts the ferrite composite material through melting, the protective layer is cut preferentially, the protective layer can relieve the heat accumulation process and play a role in protecting the ferrite layer, the intermittent repeated scanning cutting heat affected zone is smaller, the brittle damage can be further prevented, and the cutting effect is better.
Description
Technical Field
The invention belongs to the technical field of laser processing, and particularly relates to a laser cutting method for a ferrite composite material.
Background
With the rapid development of communication technology, various wireless devices are widely applied to various terminal devices, but there is a serious interference phenomenon among various signals. The use of the electromagnetic shielding material can obviously reduce the interference phenomenon and ensure the stability and safety of the equipment. The novel ferrite composite material is widely adopted due to small volume and stable shielding. However, in the using process, the novel ferrite composite material still needs to be cut with high quality to meet the customized patch requirements of various terminal devices.
The traditional cutting method is mechanical cutting, adopts die cutting and punching modes, has low processing efficiency, and is easy to break the ferrite composite material during processing. The patent publication No. CN211804430U discloses a ferrite die cutting device with high cutting precision, which has high processing efficiency, but has poor cutting quality, is easy to cause brittle fracture of material edges, and has limitation in cutting complex shapes. The patent publication No. CN104107983A discloses a novel ferrite laser cutting method, which only realizes simple linear cutting, and cannot realize complex cutting tracks. The patent publication No. CN111822879A discloses an ultrafast laser processing apparatus and a processing method for ferrite materials, which have good processing quality and high precision, but the ultrafast laser processing apparatus is expensive and has low processing efficiency, and cannot be applied and popularized on a large scale. The patent publication No. CN 112008236A discloses a laser cutting method and a laser cutting device for ferrite, which have good cutting quality, complex dual laser device and difficult repeated positioning, and need continuous maintenance in long-term operation, which is not favorable for batch production.
In summary, the cutting method of ferrite material still has the contradiction problem between cutting efficiency and cutting quality at present, and lacks the cutting method that low edge damage, high cutting efficiency and be applicable to complicated shape to satisfy light-weighted, customization cutting demand.
Disclosure of Invention
Therefore, the invention provides a laser cutting method for a ferrite composite material, which overcomes the defect that the edge damage is easy to generate under the condition of high-efficiency cutting of the ferrite composite material with a complex shape.
A laser cutting method for ferrite composite materials comprises the following steps:
firstly, installing a ferrite composite material to ensure that a protective layer is cut preferentially;
secondly, emitting laser and focusing to obtain a focused beam, and controlling the focused beam to form a focus on the surface of the ferrite composite material;
and thirdly, controlling the focused light beam to move along a set track, and intermittently and repeatedly scanning the ferrite composite material until the cutting is finished.
Preferably, the following steps are further performed before the intermittent repeated scanning: optimizing a scanning path, wherein the scanning path comprises cutting track corner rounding, filling space optimization and filling line scanning sequence optimization; and optimizing the scanning speed, and sequentially simulating the scanning speed from high to low to select the highest scanning speed capable of realizing cutting.
Preferably, the intermittent repeated scanning comprises a scanning process and a cooling process;
the scanning process is that the focused light beam repeatedly scans the processing area along a set track, and the repetition times is n;
the cooling process is to cool the processing area for t;
and firstly, carrying out a scanning process, then carrying out a cooling process, carrying out the next scanning process after the ferrite composite material is cooled to the temperature before scanning, then carrying out the cooling process, and repeating the process for N times until the ferrite composite material is cut.
Preferably, when the scanning process and the cooling process are completed once in the intermittent repeated scanning process, the depth of the cutting seam is increased, and the focus moves downwards by 0.02-0.03 mm.
Preferably, when the thickness of the ferrite composite material is 0.1-0.2 mm, n is 30 times;
when the thickness of the ferrite composite material is 0.2-0.4 mm, n is 20 times;
when the thickness of the ferrite composite material is more than 0.4mm, n is 10 times.
Preferably, the cooling time t is proportional to the number of scanning times n;
the number N of the intermittent repeated scanning is in direct proportion to the thickness of the ferrite composite material (6), and the number N of the intermittent repeated scanning is in inverse proportion to the moving speed of the focus.
Preferably, the cooling process is air cooling.
Preferably, the cutting process is provided with a shielding gas.
Has the advantages that: the invention overcomes the defect that the complex-shaped ferrite composite material is easy to generate brittle damage in the cutting process, the focused light beam cuts the ferrite composite material through melting, the protective layer is cut preferentially, the protective layer can relieve the heat accumulation process and play a role in protecting the ferrite layer, the intermittent repeated scanning cutting heat affected zone is smaller, the brittle damage can be further prevented, and the cutting effect is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of an embodiment of the present invention;
FIG. 2 is a schematic view of the apparatus connection;
FIG. 3 is a schematic structural view of a ferrite composite;
FIG. 4 is a low damage cut heat affected zone characterization of a polymer protective layer;
FIG. 5 is a low damage cut heat affected zone characterization of the rubber substrate layer;
FIG. 6 is a diagram showing the cutting effect of the ferrite composite material;
description of reference numerals:
1. ultraviolet nanosecond laser; 2. an optical component; 3. a digital galvanometer; 4. a telecentric field lens; 5. focusing the light beam; 6. a ferrite composite material; 61. a polymeric protective layer; 62. a ferrite layer; 63. a rubber substrate layer; 64. an adhesive layer; 7. an engineering machine.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
A laser cutting method for ferrite composite material, as shown in fig. 1, comprising the following steps:
a cutting device preparation phase for preparing a device comprising:
the engineering machine 7 is provided with laser software and cutting software;
the nanosecond ultraviolet laser 1 is controlled by laser software and used as a laser source to provide laser, and the parameters are that the pulse width is less than 15ns, the wavelength is 355nm, the power is 5-20W, and the maximum repetition frequency is 200 kHz.
An optical assembly 2 which can be used to condition the laser light emitted by the nanosecond ultraviolet laser 1.
A telecentric field lens 4 for focusing the laser light to form a focused beam 5.
A digital galvanometer 3, controlled by cutting software, for controlling the movement of the focal point of the focused beam 5 and scanning the ferrite composite material 6.
The device is configured as shown in fig. 2, the engineering machine is respectively connected with the nanosecond ultraviolet laser 1 and the digital galvanometer 3, the optical component 2 is arranged between the output end of the nanosecond ultraviolet laser 1 and the digital galvanometer 3, and the telecentric field lens 4 is arranged between the digital galvanometer 3 and the ferrite composite material 6.
The cutting preparation stage comprises the following steps:
in a first step, the ferrite composite material 6 is installed with the protective layer facing upwards. As shown in fig. 3, the ferrite composite material 6 is generally a laminated structure, and includes a ferrite polymer protective layer 61, a rubber base layer 63 and a ferrite layer 62, the ferrite layer 62 is disposed between the ferrite polymer protective layer 61 and the rubber base layer 63, and adhesive layers 64 are disposed between the ferrite layer 62 and the ferrite polymer protective layer 61 and the rubber base layer 63, respectively, and connected by the adhesive layers 64, so as to form a flexible composite structure.
In this embodiment, ferrite layer 62 thermal conductivity is big, and rubber substrate layer 63 and polymer protective layer 61 are low melting point material, and in the cutting process, can produce a large amount of heats, and rubber materials can strongly absorb these heats, and rubber substrate layer 63 can lead to the heat to accumulate fast and produce kerf edge melting and splash upwards, and ferrite polymer protective layer 61 can show up and alleviate the heat accumulation process, reduces the heat affected zone, improves the cutting quality, reduces marginal damage.
A protective gas is provided as a protective layer to protect the ferrite composite material 6.
On one hand, the shielding gas can prevent the ferrite layer 62 from being oxidized in the cutting process, and on the other hand, the shielding gas can be used as a refrigerating medium to reduce the temperature reduction in the repeated scanning process and the intermittent period and inhibit the expansion of a heat affected zone.
And secondly, emitting laser and focusing to obtain a focused beam, and controlling the focused beam to form a focus on the surface of the ferrite composite material. The nanosecond ultraviolet laser 1 is controlled to emit laser beams through laser software on the engineering machine 7. The wavelength of the laser beam is 355nm, the laser beam is adjusted through the optical component 2, then enters the digital galvanometer 3, finally generates a focused beam 5 through the telecentric field lens 4, and the focused beam 5 forms a focus on the upper surface of the ferrite composite material 6 to prepare for starting cutting.
In the embodiment, the nanosecond ultraviolet laser has high peak power, high photon energy and short wavelength, the absorption rate of various metal materials, oxides and non-metal materials is higher than that of visible light and infrared bands, and the processing quality and efficiency of the ferrite composite material 6 can be obviously improved, and especially the cutting damage to the rubber substrate 63 and the polymer protective layer 61 can be reduced.
And thirdly, controlling the focused light beam 5 to move along a set track, and intermittently and repeatedly scanning the ferrite composite material 6 until the cutting is finished. A cutting track is set in advance in cutting software, the digital galvanometer 3 is controlled through the cutting software on the engineering machine 7, the position of a focusing point is adjusted by the digital galvanometer 3, and then a focusing light beam 5 is controlled to intermittently and repeatedly scan the ferrite composite material 6 to form the cutting track.
In this embodiment, the scanning of the digital galvanometer 3 has the advantages of high speed, high precision, high repetition precision and the like, and can realize the scanning of various complex shapes and precise patterns. The nanosecond ultraviolet laser can obtain a high-intensity focused light spot after being focused by the telecentric field lens 4. The digital galvanometer 3 can realize high-precision and rapid scanning of focused light spots by matching with the telecentric field lens 4, and various complex shapes can be processed in the breadth.
The scan path and scan speed are optimized prior to the intermittent repeat scan.
Optimizing a scanning path, wherein the scanning path comprises cutting track corner rounding, filling space optimization and filling line scanning sequence optimization; the scanning speed is optimized, and the higher scanning speed is prioritized. The cutting software can record the graphic data in advance. Basically, scanning paths such as straight lines, curves, closed graphs and complex combined graphs can be quickly realized by cutting software so as to meet the requirements of cutting of various electromagnetic shielding patches. Different scanning paths correspond to different scanning parameters, which are optimized by the system, and relate to laser parameters (such as power and frequency) and scanning speed, filling mode and the like.
The intermittent repetitive scanning includes a scanning process and a cooling process.
The scanning process is that the focused light beam 5 repeatedly scans the processing area along a set track, and the repetition times is n;
the cooling process is to cool the processing area for t;
and firstly, carrying out a scanning process, then carrying out a cooling process, carrying out the next scanning process after the ferrite composite material is cooled to the temperature before scanning, then carrying out the cooling process, and repeating the process for N times until the ferrite composite material is cut.
When the intermittent repeated scanning is carried out, the cutting depth is increased when the scanning process and the cooling process are completed once, the focus moves downwards by 0.02-0.03 mm, and the moving distance of the focus is determined by the expansion speed of the cutting depth of the material.
The repeated scanning times n can be adjusted according to the cutting efficiency and quality requirements of the ferrite composite material 6 with different thicknesses, generally 10-30 times, 30 times for the material with the thickness of 0.1-0.2 mm, 20 times for the material with the thickness of 0.2-0.4 mm, and 10 times for the material with the thickness of more than 0.4 mm.
The cooling time t is proportional to the number of repeated scanning times n, and generally, the more the number of repeated scanning times is, the more heat is generated when cutting the ferrite composite material 6, and the more time is required for the corresponding cooling process. Generally, the cooling process adopts the air cooling, and the air cooling is comparatively convenient, in addition, can add the refrigerant or blow according to the demand and further reduce the cooling time, promote cutting efficiency.
The number of intermittent repetitive scans N is related to the thickness of the ferrite composite material 6 and the movement of the focal point of the focused beam 5.
As can be seen from the above-mentioned number of repeated scanning N, the thicker the ferrite composite material 6 is, the smaller the number of repeated scanning N is, and the larger the number of intermittent repeated scanning N becomes when the cutting efficiency of the focused beam 5 is constant.
The thickness of the ferrite composite material 6 is not changed, the repeated scanning times are not changed, and the higher the downward moving speed of the focus is, the higher the cutting efficiency of the focused light beam 5 is, and correspondingly, the intermittent repeated scanning times N are reduced.
In this embodiment, ferrite layer 62 among ferrite combined material 6 has a large thermal conductivity, and rubber substrate layer 63 and polymer protective layer 61 are low melting point materials, therefore ferrite layer 62 heat accumulation can lead to rubber substrate layer 63 and polymer protective layer 61 to melt seriously in the scanning process, intermittent type repeated scanning can show and reduce the heat affected zone, compare actual cutting effect, compare in continuous repeated scanning and the mode of continuously cooling, intermittent type scanning cutting heat affected zone is littleer, and the cooling mode can adopt more convenient air cooling, and continuous scanning is still relatively poor in the cutting effect under the condition of continuously injecting strong refrigeration medium.
The specific cutting process is as follows:
the ferrite composite 6 is 0.3mm thick with the ferrite layer 62 being 0.15mm thick.
The nanosecond ultraviolet laser 1 parameters are: frequency 80kHz, power 11W;
the scanning parameters are: the scanning speed is 1mm/s, the repeated scanning times n are 20, and the interval cooling (natural cooling in air) time is 10 s; the focus was not moved and the process was repeated for a number of times N of 7.
The cutting effect is as shown in fig. 4 and fig. 5, the edges of the cut are smooth and have no melting and burr, the width of the heat affected zone of the polymer protective layer 61 is 87 μm, the width of the heat affected zone of the rubber substrate layer 62 is 21 μm, and the low-damage and high-precision laser cutting of the ferrite composite material 6 is realized.
The specific cutting process is as follows:
the ferrite composite 6 shield patch cut as shown in fig. 6 comprises: circular section and antenna extraction grooving, the specific cutting process 1 is consulted to the laser parameter to set up the shielding gas, wherein antenna extraction grooving profile is through the filleting processing, and the fillet radius is 0.2 mm. After cutting, the shielding patch has clear outline and no burr, the ferrite layer 62 has no fragmentation, the size is accurate, the shape is attractive, the shape can be customized, and the application potential in the electronic industry is shown.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A laser cutting method for ferrite composite materials is characterized by comprising the following steps:
firstly, installing a ferrite composite material (6) to ensure that a protective layer is cut preferentially;
secondly, emitting laser and focusing to obtain a focused beam, and controlling the focused beam to form a focus on the surface of the ferrite composite material (6);
and thirdly, controlling the focused light beam (5) to move along a set track, and intermittently and repeatedly scanning the ferrite composite material (6) until the cutting is finished.
2. The laser cutting method for ferrite composite material as claimed in claim 1, wherein the following steps are further performed before the intermittent repeated scanning: optimizing a scanning path, wherein the scanning path comprises cutting track corner rounding, filling space optimization and filling line scanning sequence optimization; and optimizing the scanning speed, and sequentially simulating the scanning speed from high to low to select the highest scanning speed capable of realizing cutting.
3. The laser cutting method for ferrite composite material as claimed in claim 1, wherein said intermittently repeated scanning includes a scanning process and a cooling process;
the scanning process is that the focused light beam (5) repeatedly scans the processing area along a set track, and the repetition times is n;
the cooling process is to cool the processing area for t;
firstly, scanning, then cooling, waiting for the ferrite composite material (6) to be cooled to the temperature before scanning, then carrying out the next scanning, then carrying out the cooling, and repeating the process for N times until the ferrite composite material (6) is cut.
4. The laser cutting method for ferrite composite material as claimed in claim 3, wherein when the scanning process and the cooling process are repeated intermittently, the depth of the cut is increased and the focus is moved downward by 0.02-0.03 mm.
5. The laser cutting method for the ferrite composite material as claimed in claim 4, wherein when the thickness of the ferrite composite material (6) is 0.1-0.2 mm, n is 30 times;
when the thickness of the ferrite composite material (6) is 0.2-0.4 mm, n is 20 times;
when the thickness of the ferrite composite material (6) is more than 0.4mm, n is 10 times.
6. The laser cutting method for ferrite composite material as claimed in claim 5, wherein said cooling time t is proportional to the number of scanning times n;
the number N of the intermittent repeated scanning is in direct proportion to the thickness of the ferrite composite material (6), and the number N of the intermittent repeated scanning is in inverse proportion to the moving speed of the focus.
7. The laser cutting method for ferrite composite material as claimed in claim 5, wherein said cooling process is air cooling.
8. The laser cutting method for ferrite composite material as claimed in claim 1, wherein a shielding gas is provided during the cutting process.
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