Device and method for automatically cutting brazing filler metal overflowing from ceramic copper-clad plate
阅读说明：本技术 一种自动切除陶瓷覆铜板溢出钎料的装置及方法 (Device and method for automatically cutting brazing filler metal overflowing from ceramic copper-clad plate ) 是由 张德库 罗小阳 何思源 贺琼 唐甲林 于 2019-09-17 设计创作，主要内容包括：本发明公开一种自动切除陶瓷覆铜基板溢出钎料的装置及方法,其中,所述装置包括用于放置所述陶瓷覆铜板的变位工作台、设置在所述变位工作台上方且可移动的超声波换能器和激光切割器,以及与所述超声波换能器和激光切割器分别电连接的计算机。本发明提供的装置能够有效切除多余的铜板和溢出的钎料,避免溢出料与铜板表面发生共晶反应从而污染铜板,提升了活性钎焊法制备的陶瓷覆铜板的品质,同时,切割掉多余的铜板,能够有效减少陶瓷覆铜板刻蚀工序的生产成本,并还减少了刻蚀过程中对环境的污染。(The invention discloses a device and a method for automatically cutting off brazing filler metal overflowing from a ceramic copper-clad substrate, wherein the device comprises a displacement workbench for placing the ceramic copper-clad substrate, an ultrasonic transducer and a laser cutter which are arranged above the displacement workbench and can move, and a computer which is respectively and electrically connected with the ultrasonic transducer and the laser cutter. The device provided by the invention can effectively cut off redundant copper plates and overflowing brazing filler metal, prevent overflow materials from generating eutectic reaction with the surfaces of the copper plates so as to pollute the copper plates, improve the quality of the ceramic copper-clad plate prepared by an active brazing method, and simultaneously cut off the redundant copper plates, can effectively reduce the production cost of the etching process of the ceramic copper-clad plate and also reduce the pollution to the environment in the etching process.)
1. The device for automatically cutting the overflowing brazing filler metal of the ceramic copper-clad plate is characterized by comprising a displacement workbench for placing the ceramic copper-clad plate, an ultrasonic transducer and a laser cutter which are arranged above the displacement workbench and can move, and a computer which is respectively and electrically connected with the ultrasonic transducer and the laser cutter.
2. The device for automatically cutting off the overflowing brazing filler metal from the ceramic copper-clad plate according to claim 1, further comprising a first bracket fixedly connected with the displacement workbench and a second bracket fixedly connected with the ultrasonic transducer, wherein the first bracket and the second bracket are connected through a sliding guide rail.
3. The device for automatically cutting off the brazing filler metal overflowing from the ceramic copper-clad plate according to claim 2, wherein a backing plate is arranged between the displacement workbench and the ceramic copper-clad plate.
4. A method for automatically cutting off overflowing brazing filler metal of a ceramic copper-clad plate comprises the following steps:
under the control of a computer, scanning a ceramic copper-clad plate by moving an ultrasonic transducer to obtain boundary contour information of the ceramic copper-clad plate;
and the laser cutter receives the boundary contour information of the ceramic copper-clad plate sent by the computer and cuts off the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate according to the boundary contour information.
5. The method for automatically cutting off the brazing filler metal overflowing from the ceramic copper-clad plate according to claim 4, wherein under the control of the control computer, before scanning the ceramic copper-clad plate by moving the ultrasonic transducer to obtain the boundary contour information of the ceramic copper-clad plate, the method further comprises the following steps:
and cleaning the ceramic-based copper clad laminate, and coating a coupling agent on the surface of the cleaned ceramic copper clad laminate.
6. The method for automatically cutting off the overflowing brazing filler metal of the ceramic copper-clad plate according to claim 5, wherein the couplant is engine oil or glycerol.
7. The method for automatically cutting off the overflowing brazing filler metal of the ceramic copper-clad substrate according to claim 4, wherein the step of scanning the ceramic copper-clad plate by moving an ultrasonic transducer under the control of a control computer to obtain the information of the ceramic boundary contour comprises the following steps:
scanning the ceramic copper-clad plate by an ultrasonic transducer, and recording the time of the change of the reflected wavelength signal of the ultrasonic transducer in real time by the computer;
and the computer obtains the specific coordinates of the brazing filler metal overflowing from the ceramic copper-clad plate according to the time when the ultrasonic transducer reflects the wavelength signal to change and the average displacement speed of the ultrasonic transducer, and generates a two-dimensional cloud picture with boundary contour information.
8. The method for automatically cutting off the brazing filler metal overflowing from the ceramic copper-clad plate according to claim 4, wherein the step of cutting off the brazing filler metal and the excessive copper plate overflowing from the ceramic copper-clad plate by the laser cutter according to the boundary contour information of the ceramic copper-clad plate sent by the computer comprises the following steps:
obtaining the thickness of the copper plate in the ceramic copper-clad plate, and comparing the thickness of the copper plate with a thickness threshold value preset in a computer;
if the thickness of the copper plate in the ceramic copper-clad plate is smaller than the thickness threshold value, the laser cutter cuts off the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate at one time according to the boundary contour information;
and if the thickness of the copper plate in the ceramic copper-clad plate is larger than or equal to the thickness threshold value, the laser cutter cuts the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate twice according to the boundary contour information.
9. The method for automatically cutting off the brazing filler metal overflowing from the ceramic copper clad substrate according to claim 8, wherein the thickness threshold is 0.5 mm.
10. The method for automatically cutting off the brazing filler metal overflowing from the ceramic copper-clad plate according to claim 4, wherein the ceramic copper-clad plate comprises a first copper plate, a first brazing seam, a first active layer, a ceramic plate, a second active layer, a second brazing seam and a second copper plate which are sequentially arranged.
Technical Field
The invention relates to the field of manufacturing of ceramic copper-clad plates, in particular to a device and a method for automatically cutting off overflowing brazing filler metal of a ceramic copper-clad plate.
Background
The ceramic copper-clad plate is a composite metal ceramic substrate formed by fixedly welding high-conductivity oxygen-free copper with the surface of ceramic under the pressurization and high temperature, has the characteristics of high thermal conductivity, high electrical insulation, high mechanical strength, low expansion and the like of the ceramic, has the high conductivity and excellent welding performance of the oxygen-free copper metal, is easy to etch various patterns, and is a key material for packaging and connecting a chip and a radiating substrate of a power module in the field of power electronics. The common preparation technology of the ceramic copper-clad plate mainly comprises the following steps: the copper clad laminate comprises an active brazing method, a direct copper clad method and a chemical copper clad method, however, in the process of preparing the ceramic copper clad laminate by adopting the active brazing method, the brazing filler metal is easy to overflow due to the capillary action, the overflowing brazing filler metal is easy to have eutectic reaction with the surface of the copper plate, and then the copper plate can be polluted, and the use performance of the ceramic copper clad laminate is influenced.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a device and a method for automatically cutting off the overflowing brazing filler metal of a ceramic copper-clad plate, and aims to solve the problems that the existing ceramic copper-clad plate prepared by an active brazing method is easily polluted by the brazing filler metal and has poor service performance.
The technical scheme of the invention is as follows:
the device comprises a displacement workbench for placing the ceramic copper-clad plate, an ultrasonic transducer and a laser cutter which are arranged above the displacement workbench and can move, and a computer which is respectively and electrically connected with the ultrasonic transducer and the laser cutter.
The device for automatically cutting the brazing filler metal overflowing from the ceramic-based copper-clad plate comprises a first support fixedly connected with a displacement workbench and a second support fixedly connected with an ultrasonic transducer, wherein the first support and the second support are connected through a sliding guide rail.
The device for automatically cutting the brazing filler metal overflowing from the ceramic-based copper-clad plate is characterized in that a base plate is arranged between the displacement workbench and the ceramic copper-clad plate.
A method for automatically cutting solder overflowing from a ceramic-based copper-clad plate comprises the following steps:
under the control of a computer, scanning a ceramic copper-clad plate by moving an ultrasonic transducer to obtain boundary contour information of the ceramic copper-clad plate;
and the laser cutter receives the boundary contour information of the ceramic copper-clad plate sent by the computer, and cuts off the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate according to the boundary contour information.
The method for automatically cutting the brazing filler metal overflowing from the ceramic copper-clad plate comprises the following steps of, under the control of a computer, scanning the ceramic copper-clad plate by moving an ultrasonic transducer, and before obtaining boundary contour information of the ceramic copper-clad plate:
and cleaning the ceramic copper clad laminate, and coating a coupling agent on the surface of the cleaned ceramic copper clad laminate.
The method for automatically cutting the brazing filler metal overflowing from the ceramic copper-clad plate is characterized in that the coupling agent is glycerol or engine oil.
The method for automatically cutting the brazing filler metal overflowing from the ceramic-based copper-clad plate comprises the following steps of scanning the ceramic-clad plate by moving an ultrasonic transducer under the control of a computer, and acquiring boundary contour information of the ceramic-clad plate:
scanning the ceramic copper-clad plate by an ultrasonic transducer, and recording the time of the change of the reflected wavelength signal of the ultrasonic transducer in real time by the computer;
and the computer obtains the specific coordinates of the brazing filler metal overflowing from the ceramic copper-clad plate according to the time when the ultrasonic transducer reflects the wavelength signal to change and the average displacement speed of the ultrasonic transducer, and generates a two-dimensional cloud picture with boundary contour information.
The method for automatically cutting the brazing filler metal overflowing from the ceramic copper-clad plate comprises the following steps of:
obtaining the thickness of the copper plate in the ceramic copper-clad plate, and comparing the thickness of the copper plate with a thickness threshold value preset in a computer;
if the thickness of the copper plate in the ceramic copper-clad plate is smaller than the thickness threshold value, the laser cutter cuts off the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate at one time according to the boundary contour information;
and if the thickness of the copper plate in the ceramic copper-clad plate is larger than or equal to the thickness threshold value, the laser cutter cuts the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate twice according to the boundary contour information.
The method for automatically cutting the brazing filler metal overflowing from the ceramic copper-clad plate is characterized in that the thickness threshold value is 0.5 mm.
The method for automatically cutting the brazing filler metal overflowing from the ceramic copper-clad plate comprises a first copper plate, a first brazing seam, a first active layer, a ceramic plate, a second active layer, a second brazing seam and a second copper plate which are sequentially stacked.
Has the advantages that: the invention designs a device for automatically cutting off the overflowing brazing filler metal of a ceramic copper-clad plate, which is characterized in that the ceramic copper-clad plate is scanned by an ultrasonic transducer under the control of a computer to obtain the outline information of the ceramic boundary, and then a laser obtains the outline information of the ceramic boundary to cut off the overflowing brazing filler metal and redundant copper plates.
Drawings
FIG. 1 is a schematic structural diagram of a device for automatically cutting off overflow brazing filler metal from a ceramic copper-clad plate according to the present invention.
FIG. 2 is a flow chart of a preferred embodiment of the method for automatically cutting solder overflow from a ceramic-based copper-clad plate according to the present invention.
Detailed Description
The invention provides a device and a method for automatically cutting off overflowing brazing filler metal of a ceramic copper-clad plate, and the invention is further described in detail below in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a device for automatically cutting off solder overflowing from a ceramic copper-clad plate according to an embodiment of the present invention, and as shown in the figure, the device includes a displacement table 20 for placing the ceramic copper-clad plate 10, an
In the embodiment, the computer sends information to the ultrasonic transducer to enable the ultrasonic transducer to scan the ceramic copper-clad plate to obtain boundary contour information of the ceramic copper-clad plate, then the computer connected with the laser cutter sends the boundary contour information of the ceramic copper-clad plate to the laser cutter, the laser cutter receives the boundary contour information of the ceramic copper-clad plate, moves to any boundary contour position, cuts the ceramic copper-clad plate under the protection of inert gas, and cuts overflowing brazing filler metal and redundant copper plates.
In some embodiments, as shown in fig. 1, the ceramic copper clad laminate 10 includes a first copper plate 1, a first brazing seam 2, a first active layer 3, a ceramic plate 4, a second active layer 5, a second brazing seam 6, and a second copper plate 7, which are stacked in sequence from top to bottom. In the present embodiment, the excess copper plate refers to a non-overlapping area of the first copper plate 1 and the ceramic plate 4 and a non-overlapping area of the second copper plate 7 and the ceramic plate 4, and the overflowing brazing filler metal refers to brazing filler metal that overflows to the excess copper plate when brazing the first brazing seam 2 and the second brazing seam 6. The device for automatically cutting off the overflowing brazing filler metal of the ceramic copper-clad plate can effectively cut off the overflowing brazing filler metal and the redundant copper plate, thereby avoiding the phenomenon that the overflowing brazing filler metal and the surface of the copper plate are subjected to eutectic reaction to pollute the copper plate, and improving the quality of the ceramic copper-clad plate prepared by an active brazing method.
In some embodiments, as shown in fig. 1, a
In some embodiments, there is also provided a method for automatically cutting off an overflow solder of a ceramic copper-clad substrate, comprising the steps of:
s100, under the control of a computer, scanning a ceramic copper-clad plate by moving an ultrasonic transducer to obtain boundary contour information of the ceramic copper-clad plate;
s200, the laser cutter receives boundary contour information of the ceramic copper-clad plate sent by the computer, and cuts off brazing filler metal and redundant copper plates overflowing from the ceramic copper-clad plate according to the boundary contour information.
In the existing ceramic copper-clad plate prepared by adopting an active brazing method, brazing filler metal is easy to overflow due to capillary action in the welding process, and the overflowing brazing filler metal and the surface of the copper plate complete eutectic reaction to pollute the copper plate and influence the service performance of the ceramic copper-clad plate. According to the embodiment, the ceramic copper-clad plate is scanned by the ultrasonic transducer under the control of the computer to obtain the outline information of the ceramic boundary, then the computer connected with the laser sends the outline information of the ceramic boundary to the laser, the laser receives the outline information of the ceramic boundary, and the overflowing brazing filler metal and the redundant copper plate are cut off, so that the phenomenon that the copper plate is polluted due to eutectic reaction between the overflowing brazing filler metal and the surface of the copper plate is effectively avoided, and the quality of the ceramic copper-clad plate prepared by an active brazing method is improved.
In some embodiments, the step of obtaining the boundary contour information of the ceramic copper-clad plate by moving the ultrasonic transducer to scan the ceramic copper-clad plate under the control of the computer comprises:
s110, scanning the ceramic copper-clad plate through an ultrasonic transducer, and recording the time of the change of a reflected wavelength signal of the ultrasonic transducer in real time by the computer;
and S120, the computer obtains the specific coordinates of the solder overflowing from the ceramic copper-clad plate according to the time when the ultrasonic transducer reflects the wavelength signal to change and the average displacement speed of the ultrasonic transducer, and generates a two-dimensional cloud picture with boundary contour information.
Specifically, as shown in fig. 2, in the present embodiment, the ceramic copper-clad plate is scanned by using the ultrasonic transducer disposed above the displacement table, and when the ultrasonic transducer scans through the non-overlapped region (excess copper plate) of the copper plate and the ceramic plate, the ultrasonic wave emitted by the ultrasonic transducer is transmitted in the solid copper plate for a certain distance and then is converted into a gaseous air; when the ultrasonic transducer scans the overlapped area of the copper plate and the ceramic plate, the transmitted ultrasonic wave sequentially passes through the solid first copper plate 1, the first brazing seam 2, the first active layer 3, the ceramic plate 4, the second active layer 5, the second brazing seam 6 and the second copper plate 7, the reflected wave of the ultrasonic wave is different from that of the ultrasonic wave which is transmitted in a solid medium when the overlapped area of the copper plate and the ceramic plate is scanned, namely the reflected wavelength signal changes, at the moment, a computer connected with the ultrasonic transducer records the time of the change of the reflected wavelength signal of the ultrasonic transducer in real time, the specific coordinate of the brazing filler metal overflowing from the ceramic copper-clad plate can be obtained according to the time of the change of the reflected wavelength signal of the ultrasonic transducer and the average displacement speed of the ultrasonic transducer, the computer can generate a two-dimensional cloud picture with complete boundary profile information after the whole surface of the copper plate is scanned, and then, extracting the boundary outline of the ceramic copper-clad plate, moving the laser cutter to any boundary outline position according to the extracted boundary outline of the ceramic copper-clad plate, cutting the ceramic copper-clad plate under the protection of inert gas, and cutting the overflowing brazing filler metal and the redundant copper plate.
In some embodiments, before the step of scanning the ceramic copper-clad plate by moving the ultrasonic transducer under the control of the computer to obtain the boundary contour information of the ceramic copper-clad plate, the method further comprises the following steps: and cleaning the ceramic copper clad laminate, and coating a coupling agent on the surface of the cleaned ceramic copper clad laminate.
Because in the scanning process, the oxide and the impurity on the surface of the ceramic-based copper-clad plate can influence the accuracy of the scanning result of the ultrasonic transducer, the ceramic-based copper-clad plate needs to be cleaned before scanning, the oxide and the impurity on the surface of the ceramic-based copper-clad plate are removed, and a layer of uniform coupling agent is coated on the surface of the ceramic-based copper-clad plate, so that the scanning accuracy can be effectively improved.
In some embodiments, the coupling agent is engine oil or glycerin.
In some embodiments, the step of receiving the boundary contour information of the ceramic copper-clad plate sent by the computer by the laser cutter and cutting the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate according to the boundary contour information comprises:
obtaining the thickness of the copper plate in the ceramic copper cladding, and comparing the thickness of the copper plate with a thickness threshold value preset in a computer;
if the thickness of the copper plate in the ceramic copper-clad plate is smaller than the thickness threshold value, the laser cutter cuts off the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate at one time according to the boundary contour information;
and if the thickness of the copper plate in the ceramic copper-clad plate is larger than or equal to the thickness threshold value, the laser cutter cuts the brazing filler metal and the redundant copper plate overflowing from the ceramic copper-clad plate twice according to the boundary contour information.
As shown in fig. 2, in order to improve the cutting effect and ensure that the quality of the cut copper-clad ceramic plate is not affected, in this embodiment, the thickness of the copper plate in the copper-clad ceramic plate is compared with a preset thickness threshold in a computer in advance, and if the thickness of the copper plate is smaller than the thickness threshold, the first copper plate, the second copper plate and the brazing filler metal overflowing from the first copper plate and the second copper plate in the copper-clad ceramic plate are cut off at one time; and if the thickness of the copper plate is larger than or equal to the thickness threshold value, cutting the brazing filler metal overflowing from the ceramic copper-clad plate and the redundant copper plate twice, specifically, cutting the first copper plate and the brazing filler metal overflowing from the first copper plate, and then cutting the second copper plate and the brazing filler metal overflowing from the second copper plate.
In some preferred embodiments, the thickness threshold is 0.5 mm. According to the invention, when the thickness of the copper plate is more than or equal to 0.5mm, the copper plate is cut twice, so that the cutting effect is effectively ensured, and the quality of the cut ceramic copper-clad plate is not affected.
The following further explains the device and method for automatically cutting the overflowing brazing filler metal of the ceramic copper-clad plate by the specific embodiment:
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