CN110798994A - Device and method for preparing curved conformal multilayer printed board - Google Patents
Device and method for preparing curved conformal multilayer printed board Download PDFInfo
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
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Abstract
The invention provides a device and a method for preparing a curved conformal multilayer printed board, which are based on a five-axis motion system combined with a piezoelectric ink-jet technology, and adopt a double-nozzle design, wherein one nozzle sprays and deposits a nano conductive material, the other nozzle sprays and deposits a dielectric material, and the two materials are deposited on a curved substrate according to a certain sequence. The material is quickly solidified and shaped by matching with a real-time solidifying device in the process of spraying and forming the material, so that the solvent in the nano conductive material is volatilized to meet the conduction and interconnection, and the molecular chain of the dielectric material is spread and shaped after the cross-linking reaction. The curing mode is an exposure curing mode of the conformal curved surface, and the phenomena of inconsistent curing effect and inconsistent thickness caused by the exposure of the planar light source to the curved surface are avoided. The printing of the curved conformal multilayer circuit board is finally realized by printing and stacking the two materials layer by layer and controlling the curing conditions in the process.
Description
Technical Field
The invention relates to the technical field of preparation of curved surface conformal multilayer printed boards, in particular to a device and a method for preparing a curved surface conformal multilayer printed board.
Background
The traditional printed board is usually manufactured by processes of exposure etching of developing glue, chemical plating, laser etching and the like to realize the manufacture of a single-layer circuit, and then is formed into a multilayer board in a laminating mode. And the vertical interconnection features realize interconnection and intercommunication among multiple layers in a chemical copper deposition mode after laser drilling and mechanical drilling. The whole process is complicated and needs chemical plating and etching, so that material waste and environmental pollution are caused. For the manufacture of curved conformal rigid boards, the traditional process usually adopts a curved surface attaching layer pressing or gluing mode for forming after the soft board is manufactured, and the curved surface pressing process can cause the deformation of lines in the soft board so as to damage and influence signal transmission if the curvature of the curved surface is larger. For the manufacture of curved surface multilayer hard plates, the traditional process has almost no existing solution.
The piezoelectric ink-jet technology utilizes the deformation effect of piezoelectric ceramics under the action of an electric field to realize the on-demand extrusion of ink drops. Flat printed electronics, such as RFID antennas, sensors, OLEDs, etc. are now used in large numbers. Currently, the nanodimensionion of Israel corporation adopts an array piezoelectric nozzle to realize the printing of a planar multilayer printed board, so that the printing of a curved multilayer board is expected to be realized by adopting an ink jet technology. The traditional installation method of the printed board in the curved surface shell (the seeker and the curved surface radio frequency antenna array) is carried out in a plane installation mode. The space is wasted, the interconnection and intercommunication connection between the planar printed board and the front antenna is complex due to the installation mode of the planar printed board, and the scattering cross section and loss indexes are increased due to the existence of gaps, so that the signal transmission of the antenna and the related stealth performance are not facilitated. Therefore, it is also very necessary to develop a process for manufacturing a curved conformal printed board.
Disclosure of Invention
The invention provides a device and a method for preparing a curved conformal multilayer printed board, aiming at solving the problems in the prior art. The material is quickly solidified and shaped by matching with a real-time solidifying device in the process of spraying and forming the material, so that the solvent in the nano conductive material is volatilized to meet the conduction and interconnection, and the molecular chain of the dielectric material is spread and shaped after the cross-linking reaction. The curing mode is an exposure curing mode of the conformal curved surface, and the phenomena of inconsistent curing effect and inconsistent thickness caused by the exposure of the planar light source to the curved surface are avoided. The printing of the curved conformal multilayer circuit board is finally realized by printing and stacking the two materials layer by layer and controlling the curing conditions in the process.
The technical scheme of the invention is as follows:
the preparation facilities of conformal multilayer printing board of curved surface which characterized in that: the system comprises a five-axis motion system, an industrial personal computer, a curing system, a printing head device, a liquid supply system, a CCD camera and a printing platform;
the five-axis motion system comprises a five-axis motion platform and a clamping platform, the five-axis motion platform is used as a carrier of the printing platform, and the clamping platform is used as a carrier of the printing head device; the five-axis motion system is controlled by an industrial personal computer to realize the relative motion of the printing platform and the printing head device;
the printing head device comprises two piezoelectric nozzles and a liquid drop generator, and the liquid drop generator drives piezoelectric ceramics to work and extrude ink through pulse voltage excitation; the liquid drop generator can set a piezoelectric waveform, a voltage magnitude and a pulse frequency for the piezoelectric nozzle to realize a required liquid drop spraying form;
the liquid supply system comprises a gas circuit controller and an ink storage bottle; conductive ink and dielectric ink are respectively stored in different ink storage bottles, and the ink storage bottles storing different inks are respectively connected with corresponding piezoelectric nozzles; the gas path controller is externally connected with a positive pressure source and a negative pressure source; the gas circuit controller can control the printing liquid drops of the piezoelectric nozzle to be in a semi-arc shape by adjusting the positive pressure and the negative pressure output to the ink storage bottle;
the curing system is used for realizing curing of the conductive ink and the dielectric ink;
the CCD camera is used for observing the printing state and the liquid drop state and assisting in positioning the piezoelectric nozzle;
the printing platform has a heating function and a vacuum adsorption function, the heating function is used for assisting in curing the conductive material, and the adsorption function is used for fixing the soft rubber base material.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: and the five-axis motion system receives a control code obtained after processing the design file in the industrial personal computer, analyzes the control code and sends the control code to a corresponding driver, so that the relative motion of the printing platform and the printing head device is realized.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: the industrial personal computer receives the design file of the curved conformal printed board, generates a tool path file according to the design file by using CAM software, and performs printing head frequency and speed matching according to the tool path file.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: the curing system comprises a conductive ink curing lamp and a dielectric ink curing lamp which are both arranged on the clamping table and controlled by the industrial personal computer; the conductive ink curing lamp adopts a near infrared lamp curing lamp, a laser or a xenon lamp; the dielectric ink curing lamp is an ultraviolet curing lamp.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: a filter element is arranged in a transmission pipeline between the ink storage bottle and the piezoelectric nozzle, and the ink is transmitted to the piezoelectric nozzle after passing through the filter element.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: the piezoelectric nozzles are single nozzles or array nozzles, and the diameters of the nozzles of the two piezoelectric nozzles are consistent; the piezoelectric nozzle is also provided with a heating device, so that the temperature control of the piezoelectric nozzle can be realized.
In a further preferred embodiment, the device for preparing the curved conformal multilayer printed board is characterized in that: the CCD cameras are divided into a coaxial CCD camera and a paraxial CCD camera, and the optical axis of the coaxial CCD camera is parallel to the axis of the piezoelectric nozzle and used for positioning and observing the printing process; the paraxial CCD camera is a same-frequency camera and is used for observing the ink drop form.
The preparation method for realizing the curved conformal multilayer printed board by using the preparation device is characterized by comprising the following steps of: the method comprises the following steps:
step 1: selecting conductive ink and dielectric ink with the viscosity ranging from 10 to 45cp and the surface tension ranging from 10 to 55dyn/cm, and respectively filling the conductive ink and the dielectric ink in an ink storage bottle;
step 2: adjusting the gas path controller, observing the shape of the ink drop in the spray head through a paraxial CCD camera until the shape of the ink drop in the spray head is a flat arc smaller than the radius of the spray nozzle, and fixing the output pressure value of the gas path controller;
and step 3: adjusting the piezoelectric waveform, voltage and pulse frequency output by the droplet generator, and observing the ejection state of ink droplets through a paraxial CCD (charge coupled device) camera until the ink droplets ejected by the piezoelectric nozzle are in a continuous ball form without satellite sputtering points;
and 4, step 4: in an industrial personal computer, generating a tool path file by using CAM software according to the current nozzle diameter and a three-dimensional model design file, and setting a proportional relation between the speed and the injection frequency to realize speed reduction and proportional injection frequency reduction; at the moment of opening when the tool path file is also inserted with a curing system: when the angular deviation between the axial direction of the piezoelectric nozzle and the normal direction of the printing starting point of the piezoelectric nozzle after the previous curing system of the same type is closed is judged to reach a set threshold value through calculation, the curing system of the same type is started, and the printing material at the stage is cured; if the angle deviation set threshold value is not reached in the printing process of a layer of material, after the printing of the layer of material is finished, starting a curing system of the same type to cure the layer of printing material;
and 5: the printing platform is controlled by an industrial personal computer to be preheated to 80-120 ℃ before printing, and then a five-axis motion system is controlled to print according to a tool path file;
step 6: after printing is finished, the industrial personal computer controls the temperature of the heating printing platform to 160-200 ℃, post-treatment curing of the multilayer board printed on the curved surface is carried out, and the performance of the conductor material is stabilized.
In a further preferred embodiment, the method for preparing the curved conformal multilayer printed board is characterized in that: the angle difference in step 4 is set to a threshold value of 30 °.
In a further preferred embodiment, the method for preparing the curved conformal multilayer printed board is characterized in that: the conductive ink is nano silver ink, nano nickel ink or nano copper ink, and the dielectric ink is acrylic resin or epoxy resin.
Advantageous effects
The invention has the beneficial effects that:
1) according to the curved surface conformal multilayer printed board preparation device provided by the invention, the double-pressure electric spray head is adopted to support the simultaneous printing of the conductive material and the dielectric material, different printing parameters can be given according to the attributes of the materials in the printing process, and the accurate printing and forming of the double materials are realized.
2) The preparation device of the curved conformal multilayer printed board provided by the invention has various curing systems, can realize on-line rapid curing of photosensitive and thermosetting materials, and avoids subsequent secondary treatment.
3) The preparation method of the curved surface conformal multilayer printed board can quickly prepare the conformal line or the conformal printed board on the curved surface, and provides a new solution for the traditional process.
4) The preparation method of the curved surface conformal multilayer printed board can be derived and applied to curved surface conformal spray painting, curved surface sensors, curved surface multilayer frequency selection antennas and the like, and meanwhile, the scheme can also be used for printing of a planar multilayer circuit board.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a curved conformal multilayer printed board;
FIG. 2 a process of printing a dielectric material;
FIG. 3 a process of printing conductive material;
wherein: 1. a five-axis motion table; 2. a dielectric material printhead; 3. a conductive material printhead; 4. paraxial CCD; 5. a droplet generator; 6. a clamping table; 7. a coaxial CCD; 8. an infrared sensor; 9. an ultraviolet curing lamp; 10. a near infrared curing lamp; 11. a motion controller; 12. a motion control card; 13. a material storage bottle; 14. inputting at positive pressure; 15. inputting negative pressure; 16. a gas path controller; 17. designing a file; 18. an industrial personal computer; CAM software; 20. secondary development plug-ins; 21. a filter element; 22. a turntable support frame; 23. and rotating the platform.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and not to be construed as limiting the invention.
The basic principle of the invention is that dielectric ink and conductive ink are respectively formed on a curved substrate by applying a piezoelectric ink-jet printing mode, the curing processes of Near Infrared (NIR) and Ultraviolet (UV) and substrate heating are assisted in the middle process, and the on-demand ink jet of an ink-jet printing head is realized by running a processed program through an industrial personal computer and matching the jet frequency and mechanical motion. The curved conformal multilayer printed board is formed by stacking, printing and molding conductive ink and dielectric ink layer by layer.
As shown in fig. 1, the apparatus for manufacturing a curved conformal multilayer printed board in this embodiment includes a five-axis motion system, an industrial personal computer, a curing system, a printing head device, a liquid supply system, a CCD camera, and a printing platform.
The five-axis motion system comprises a five-axis motion table, a clamping table, a driver and a motion control card, and a motor and a transmission screw rod are mainly used as power and transmission devices. The five-axis motion platform is used as a carrier of the printing platform, and the clamping platform is used as a carrier of the printing head device; the motion control card in the five-axis motion system receives control codes obtained after the design files are processed in the industrial personal computer, the motion control card analyzes the codes and sends the codes to the corresponding driver and other control ports one by one, and after the commands are executed, all devices cooperatively operate, including relative motion of the printing platform and the printing head device, so that printing action is realized.
The industrial personal computer receives the design file of the curved conformal printed board, generates a tool path file according to the design file by using CAM software, performs printing head frequency and speed matching according to the tool path file, and inserts control codes such as a curing lamp switch.
The printing head device comprises two piezoelectric nozzles and a liquid drop generator, and the liquid drop generator drives piezoelectric ceramics to work and extrude ink through pulse voltage excitation; and the liquid drop generator can set a piezoelectric waveform, a voltage magnitude and a pulse frequency for the piezoelectric nozzle to realize a required liquid drop spraying form. The piezoelectric nozzles are single nozzles or array nozzles, the diameters of the nozzles of the two piezoelectric nozzles are consistent, and the preferred diameter range of the nozzles is 20-100 mu m. The piezoelectric nozzle is also provided with a heating device, so that the temperature control of the piezoelectric nozzle can be realized.
The liquid supply system comprises a gas circuit controller and an ink storage bottle; conductive ink and dielectric ink are respectively stored in different ink storage bottles, the ink storage bottles for storing different inks are respectively connected with corresponding piezoelectric nozzles, a filter element is arranged in a transmission pipeline between the ink storage bottles and the piezoelectric nozzles, and the filter element has the main function of removing agglomerated nano particles to prevent the nozzles from being blocked. The air path controller is externally connected with a positive pressure source and a negative pressure source, provides pressure for the ink storage bottle, and conveys ink to the piezoelectric nozzle after passing through the filter element from the ink storage bottle under the driving of the pressure. The air path controller stably controls the pressure and air pressure output (the adjustment precision is less than or equal to 0.01MPa) by adjusting the positive pressure and the negative pressure output to the ink storage bottle, and controls the printing liquid drops of the piezoelectric nozzle to be in a semi-arc shape.
The curing system is used to effect curing of the conductive ink and the dielectric ink. The curing system comprises a conductive ink curing lamp and a dielectric ink curing lamp which are both arranged on the clamping table and controlled by the industrial personal computer; the conductive ink curing lamp adopts a near infrared lamp curing lamp, a laser or a xenon lamp; the dielectric ink curing lamp is an ultraviolet curing lamp.
The CCD camera is divided into a coaxial CCD camera and a paraxial CCD camera, the optical axis of the coaxial CCD camera is parallel to the axis of the piezoelectric nozzle, and the coaxial CCD camera is mainly used for observing a printed and formed line and positioning functions; the paraxial CCD camera is a camera with the same frequency as the piezoelectric nozzle and is used for observing the ink drop form. In addition, the positioning function of the coaxial CCD camera can be replaced by a tool setting gauge.
The printing platform has a heating function and a vacuum adsorption function, the heating function can meet the heating requirement within the range of 200 ℃, and the main function is to heat and print the substrate to assist in curing the conductive material in the printing process. The adsorption function is used for fixing silica gel and film soft base materials.
The preparation method for realizing the curved conformal multilayer printed board by using the preparation device comprises the following steps:
step 1: selecting conductive ink and dielectric ink with the viscosity ranging from 10 to 45cp and the surface tension ranging from 10 to 55dyn/cm, and respectively filling the conductive ink and the dielectric ink in an ink storage bottle; the conductive ink can be selected from nano silver ink, nano nickel ink, nano copper ink and the like, and the dielectric ink can be selected from acrylic resin, epoxy resin and the like.
Step 2: and adjusting the gas path controller, observing the form of the ink drops in the spray head through a paraxial CCD camera until the form of the ink drops in the spray head is a flat arc smaller than the radius of the spray nozzle, and fixing the output pressure value of the gas path controller.
And step 3: and adjusting the piezoelectric waveform, the voltage and the pulse frequency output by the liquid drop generator, and observing the ejection state of the ink drops through a paraxial CCD camera until the ink drops ejected by the piezoelectric nozzle are in a continuous ball form without satellite sputtering points. The drop generator parameters can be indirectly judged whether the drop generator parameters are proper or not by printing a standard pattern and observing whether the line edge has sputtering points or not.
And 4, step 4: in an industrial personal computer, generating a tool path file by utilizing CAM (computer aided manufacturing) software (such as Mastercam) according to the current nozzle diameter and a three-dimensional model design file, and setting a proportional relation between the moving speed of a piezoelectric nozzle and the injection frequency to realize speed reduction and proportional injection frequency reduction; at the moment of opening when the tool path file is also inserted with a curing system: when the angular deviation between the axial direction of the piezoelectric nozzle and the normal direction of the printing starting point of the piezoelectric nozzle after the last curing system of the same type is closed is judged to reach 30 degrees through calculation, the curing system of the same type is opened, and the printing material printed at the stage is cured; if the angle deviation set threshold value is not reached in the printing process of one layer of material, after the printing of the layer of material is finished, the same type of curing system is started to cure the layer of printing material. The alternating relation between the printing layer number of the two materials in the printing process is set according to the deposition thickness of the specific materials.
In this embodiment, the circuit pattern and the medium base material in the three-dimensional model design file are in an assembly form, and when a tool path file is generated in the CAM, different tool bits are selected to generate the tool path file.
And 5: the printing platform is controlled by an industrial personal computer to be preheated to 80-120 ℃ before printing, and then a five-axis motion system is controlled to print according to a tool path file; if the curved surface base member temperature is difficult to be stable, then can carry out external heating device to the base plate, if bury the auxiliary heating of heating rod in the curved surface base plate, its aim at is supplementary to be printed in-process solvent and volatilizees fast in the conductive ink, makes conductive ink spray to the substrate on back quick design.
The curved substrate on the printing platform is a supporting body of the curved printing multilayer board, and in order to ensure the adhesion between the medium material and the base material, the adhesion is increased by adding a transition layer on the surface of the curved substrate and performing plasma treatment, so that the warping and peeling phenomenon in the printing process is prevented.
The printing process is judged according to the program, and the time of turning on the near infrared and ultraviolet curing lamps is judged according to the curvature (namely the angle deviation), so that the ink is ensured to be quickly shaped, and the thickness unevenness caused by flowing due to the action of gravity is prevented. Wherein near infrared is mainly used for curing the conductive ink, and ultraviolet is mainly used for curing the dielectric ink.
Step 6: after printing is finished, the temperature of the heating printing platform is controlled to 160-200 ℃ by the industrial personal computer, heat is preserved for 0.5-1 h, post-treatment curing of the multilayer board printed on the curved surface is carried out, and the performance of the conductor material is stabilized. The purpose of the temperature rise here is to further promote the fusion of the nano silver particles under the action of heat to form a good conductor.
The near infrared output power irradiation can be increased in an auxiliary manner while the temperature of the substrate is raised, so that the performance of the conductor on the surface of the multilayer board is improved. Of course, post-treatment curing of the flexographic multilayer sheet can also be performed in an oven.
Fig. 2 is a process of printing a dielectric material, and fig. 3 is a process of printing a conductive material. The conductive material selected in the embodiment is nano-silver ink, the diameter of nano-particles is 20-100 nm, the viscosity is 25cp, the surface tension is 35dyn/cm, and the curing temperature is 120 ℃/10min @1 mil. The dielectric ink is acrylic modified resin, the viscosity is 45cp, the surface tension is 30dyn/cm, and the ultraviolet wavelength is 365nm for curing. The two piezoelectric ink jet print heads select the orifice diameter of 60 μm.
The specific implementation process comprises the following steps:
step 1: conformal multi-layer circuit board design is carried out according to a substrate blank model through three-dimensional software SolidWorks, wherein the dielectric substrate and the conductor material are in an assembly form. And respectively generating a tool path file aiming at the two tool bits through a MasterCam. And setting related parameters in software, matching and inserting the speed, the frequency and the on-off light path control, and generating a printing execution file.
Step 2: the printing curved substrate is fixed on a printing platform, a CCD camera or a tool setting gauge is used for positioning the curved substrate, a printing starting point is determined, and the height of a printing head is set to be 1.2 mm.
And step 3: preheating the printing substrate to 100 ℃, and executing a printing program after the temperature is stable through thermocouple feedback.
When a section of dielectric material is printed, the program is controlled according to a curvature algorithm, the ultraviolet lamp is started to be matched with the rotary platform to move for real-time curing, and the consistency of material curing on the curved surface is ensured. As shown in fig. 2. According to the same principle, after each section of conductive material is printed, an infrared lamp is used for curing.
And 4, step 4: and repeating the printing process and the curing process of the dielectric layer and the conductive layer to form two materials which are stacked layer by layer according to the track.
And 5: after printing, the printing substrate is heated to 150 ℃ according to a preset program, and heat preservation is carried out for 0.5 h.
Step 6: the resistance and the on-off condition of the reserved point are tested through a universal meter, the curing condition is judged, if the resistivity is large, the heat preservation time can be prolonged, and the temperature of the substrate is slowly reduced after the resistance is reduced.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. The utility model provides a preparation facilities of conformal multilayer printing board of curved surface which characterized in that: the system comprises a five-axis motion system, an industrial personal computer, a curing system, a printing head device, a liquid supply system, a CCD camera and a printing platform;
the five-axis motion system comprises a five-axis motion platform and a clamping platform, the five-axis motion platform is used as a carrier of the printing platform, and the clamping platform is used as a carrier of the printing head device; the five-axis motion system is controlled by an industrial personal computer to realize the relative motion of the printing platform and the printing head device;
the printing head device comprises two piezoelectric nozzles and a liquid drop generator, and the liquid drop generator drives piezoelectric ceramics to work and extrude ink through pulse voltage excitation; the liquid drop generator can set a piezoelectric waveform, a voltage magnitude and a pulse frequency for the piezoelectric nozzle to realize a required liquid drop spraying form;
the liquid supply system comprises a gas circuit controller and an ink storage bottle; conductive ink and dielectric ink are respectively stored in different ink storage bottles, and the ink storage bottles storing different inks are respectively connected with corresponding piezoelectric nozzles; the gas path controller is externally connected with a positive pressure source and a negative pressure source; the gas circuit controller can control the printing liquid drops of the piezoelectric nozzle to be in a semi-arc shape by adjusting the positive pressure and the negative pressure output to the ink storage bottle;
the curing system is used for realizing curing of the conductive ink and the dielectric ink;
the CCD camera is used for observing the printing state and the liquid drop state and assisting in positioning the piezoelectric nozzle;
the printing platform has a heating function and a vacuum adsorption function, the heating function is used for assisting in curing the conductive material, and the adsorption function is used for fixing the soft rubber base material.
2. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 1, wherein: and the five-axis motion system receives a control code obtained after processing the design file in the industrial personal computer, analyzes the control code and sends the control code to a corresponding driver, so that the relative motion of the printing platform and the printing head device is realized.
3. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 2, wherein: the industrial personal computer receives the design file of the curved conformal printed board, generates a tool path file according to the design file by using CAM software, and performs printing head frequency and speed matching according to the tool path file.
4. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 1, wherein: the curing system comprises a conductive ink curing lamp and a dielectric ink curing lamp which are both arranged on the clamping table and controlled by the industrial personal computer; the conductive ink curing lamp adopts a near infrared lamp curing lamp, a laser or a xenon lamp; the dielectric ink curing lamp is an ultraviolet curing lamp.
5. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 1, wherein: a filter element is arranged in a transmission pipeline between the ink storage bottle and the piezoelectric nozzle, and the ink is transmitted to the piezoelectric nozzle after passing through the filter element.
6. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 1, wherein: the piezoelectric nozzles are single nozzles or array nozzles, and the diameters of the nozzles of the two piezoelectric nozzles are consistent; the piezoelectric nozzle is also provided with a heating device, so that the temperature control of the piezoelectric nozzle can be realized.
7. The apparatus for manufacturing a curved conformal multilayer printed board according to claim 1, wherein: the CCD cameras are divided into a coaxial CCD camera and a paraxial CCD camera, and the optical axis of the coaxial CCD camera is parallel to the axis of the piezoelectric nozzle and used for positioning and observing the printing process; the paraxial CCD camera is a same-frequency camera and is used for observing the ink drop form.
8. The manufacturing method for realizing the curved conformal multilayer printed board by using the manufacturing device of claim 1 is characterized in that: the method comprises the following steps:
step 1: selecting conductive ink and dielectric ink with the viscosity ranging from 10 to 45cp and the surface tension ranging from 10 to 55dyn/cm, and respectively filling the conductive ink and the dielectric ink in an ink storage bottle;
step 2: adjusting the gas path controller, observing the shape of the ink drop in the spray head through a paraxial CCD camera until the shape of the ink drop in the spray head is a flat arc smaller than the radius of the spray nozzle, and fixing the output pressure value of the gas path controller;
and step 3: adjusting the piezoelectric waveform, voltage and pulse frequency output by the droplet generator, and observing the ejection state of ink droplets through a paraxial CCD (charge coupled device) camera until the ink droplets ejected by the piezoelectric nozzle are in a continuous ball form without satellite sputtering points;
and 4, step 4: in an industrial personal computer, generating a tool path file by using CAM software according to the current nozzle diameter and a three-dimensional model design file, and setting a proportional relation between the speed and the injection frequency to realize speed reduction and proportional injection frequency reduction; at the moment of opening when the tool path file is also inserted with a curing system: when the angular deviation between the axial direction of the piezoelectric nozzle and the normal direction of the printing starting point of the piezoelectric nozzle after the previous curing system of the same type is closed is judged to reach a set threshold value through calculation, the curing system of the same type is started, and the printing material at the stage is cured; if the angle deviation set threshold value is not reached in the printing process of a layer of material, after the printing of the layer of material is finished, starting a curing system of the same type to cure the layer of printing material;
and 5: the printing platform is controlled by an industrial personal computer to be preheated to 80-120 ℃ before printing, and then a five-axis motion system is controlled to print according to a tool path file;
step 6: after printing is finished, the industrial personal computer controls the temperature of the heating printing platform to 160-200 ℃, post-treatment curing of the multilayer board printed on the curved surface is carried out, and the performance of the conductor material is stabilized.
9. The method for manufacturing the curved conformal multilayer printed board according to claim 8, wherein: the angle difference in step 4 is set to a threshold value of 30 °.
10. The method for manufacturing the curved conformal multilayer printed board according to claim 8, wherein: the conductive ink is nano silver ink, nano nickel ink or nano copper ink, and the dielectric ink is acrylic resin or epoxy resin.
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| CN114126242A (en) * | 2021-10-20 | 2022-03-01 | 哈尔滨工业大学（威海） | Preparation method of 3D printing conformal circuit |
| CN114126242B (en) * | 2021-10-20 | 2022-05-20 | 哈尔滨工业大学（威海） | 3D printing conformal circuit preparation method |
| CN114029506A (en) * | 2021-11-05 | 2022-02-11 | 鑫精合激光科技发展（北京）有限公司 | Composite additive manufacturing process for curved surface double-material titanium alloy part |
| CN114029506B (en) * | 2021-11-05 | 2023-08-08 | 鑫精合激光科技发展（北京）有限公司 | Composite additive manufacturing process of curved surface bi-material titanium alloy part |
| CN114131921A (en) * | 2021-11-17 | 2022-03-04 | 西安交通大学 | Curved surface conformal 4D printing method of thin-wall heterostructure and heterostructure |
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| CN114552169A (en) * | 2022-04-25 | 2022-05-27 | 中国电子科技集团公司第二十九研究所 | Construction method of broadband curved surface conformal radio frequency functional circuit assembly |
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