Jet printing-stripping conformal manufacturing method of complex curved surface micropattern

Abstract

The invention discloses a spray printing-stripping conformal manufacturing method for a complex curved surface micropattern, and belongs to the technical field of advanced manufacturing, and the method comprises the following steps: depositing soluble glue on the surface of a complex curved surface workpiece matrix in an electric jet form to form a strippable structure, and realizing high-precision manufacturing of the strippable structure in cooperation with a motion platform; electrically spraying a conductive metal layer on the surface of the workpiece on which the peelable structure is prepared by taking conductive metal ink as a jet printing material; standing until the strippable structure based on the soluble gel is completely dissolved, and completing etching of the pattern on the surface of the conductive metal layer; and the workpiece is heated according to the conductive metal ink sintering condition, so that the conductive metal layer reaches the preset conductive performance, and the electrical performance is ensured. According to the method, the electrofluid jet printing technology and the dissolution etching technology are combined, the multi-axis linkage platform is matched, high-precision, high-efficiency and damage-free preparation of the complex curved surface conformal micro-pattern can be achieved, and the method has good application prospects.

Description

Technical Field

[0001] The invention belongs to the field of advanced manufacturing technology and relates to a printing-peeling conformal manufacturing method for complex curved surface micro-patterns. Background Art

[0002] Micropatterns are the basis for electronic devices to realize functions such as circuit arrangement, sensor drive, signal transmission and reception, etc. They have important applications in integrated circuits, metamaterials and antennas. Micropatterns that meet the requirements of miniaturization, integration and complex surface conformal have shown great value and potential in the fields of new generation spacecraft, stealth weapons, mobile communication equipment, wearable electronics, etc. In order to realize the manufacture of micropatterns on complex curved substrates, the mainstream method at this stage is to first prepare flexible micropatterns on a plane and then transfer the micropatterns to the curved substrate, such as transfer method, film pasting method, etc. These methods inevitably have the problems of low conformal degree and poor dimensional accuracy, and cannot achieve the precision manufacture of complex surface conformal micropatterns.

[0003] Electrofluidic inkjet printing is an additive manufacturing technology that deposits liquid materials on the surface of a substrate through the action of an electric field. It has the characteristics of spatial freedom, high precision, high controllability, and high stability. Liquid functional materials form a fine jet under the shearing action of the electric field force, and can achieve high-resolution on-demand printing of patterns in conjunction with the movement of the substrate. It is an ideal manufacturing method for complex surface conformal micropatterns. However, the existing electrofluidic printing manufacturing methods for complex surface conformal micropatterns mostly directly adopt the additive direct writing method. Although this method has the advantage of high resolution of electrofluidic printing, when the manufacturing object is a micropattern composed of a large area of ​​metal and a small number of gaps, such as a gap-type metamaterial, a microstrip antenna, and an array micro-pitch electrode, the preparation efficiency is low and the preparation cycle is long, which is not of practical significance. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an improved preparation method to achieve high-precision and high-efficiency preparation of conformal micro-patterns on complex curved surfaces.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present invention proposes a printing-peeling conformal manufacturing method for complex curved surface micro-patterns, comprising the following steps: using sol as the printing material, depositing it on the surface of a complex curved workpiece substrate in the form of an electric jet, cooperating with a moving platform to achieve high-precision manufacturing of the sol gap pattern, that is, preparing a peelable structure on the surface of the complex curved workpiece, thereby obtaining a first intermediate piece; using conductive metal ink as the printing material, forming a conductive metal layer on the surface of the first intermediate piece by electrospraying, thereby obtaining a second intermediate piece; placing the second intermediate piece in a dissolving and peeling agent of the sol, and letting it stand for a period of time until the peelable structure based on the sol is completely dissolved and peeled off, completing the etching of the surface pattern of the conductive metal layer, and obtaining a third intermediate piece; and heating the third intermediate piece according to the sintering conditions of the conductive metal ink, so that the conductive metal layer reaches a preset conductive property.

[0006] Furthermore, laser thermal curing treatment is performed during the printing process of the peelable structure to ensure the dimensional accuracy of the structure and avoid adhesion of the metal layer to the soluble glue during the printing process.

[0007] Furthermore, during the printing process of the conductive metal layer, in order to control the consistency of the thickness and electrical properties of the metal conductive layer, laser thermal curing treatment is also performed during the printing process to prevent the conductive metal ink from dissolving in the dissolving stripping agent and causing damage to the conductive metal layer.

[0008] Furthermore, the conductive metal ink is nano silver ink or nano copper ink or other conductive inks.

[0009] Furthermore, the soluble gel material is a photoresist or a protective gel, preferably BP212 photoresist, AZ701 photoresist or electroplating protective gel.

[0010] Furthermore, the dissolving and stripping agent is a photoresist developer or a soluble corresponding dissolving agent.

[0011] Furthermore, the motion platform is a five-axis linkage motion platform, which has the function of complex surface processing; the five-axis linkage motion platform includes a printing module and a control module.

[0012] Further, the printing module includes a Z axis 6, an adapter plate 7, an XY motion platform 8, an adapter plate 9, a micro-displacement platform 10, a laser curing device 11, a positioning camera 12, a laser rangefinder 13, a material storage tube 14, an electro-jet printing valve 15, an observation camera 16, a fixture 17, a fixed back plate 18, and a B / C rotating shaft 19. The Z axis 6 is mounted on the bottom plate 20 through the fixed back plate 18; the XY motion platform 8 is fixed on the Z axis 6 through the adapter plate 7, and the adapter plate 9 is fixed to the lower surface of the XY motion platform 8; the positioning camera 12, the laser rangefinder 13, and the electro-jet printing valve 15 are all fixed on the adapter plate 9 through the fixture 17; the laser curing device 11 and the observation camera 16 are fixed to the lower surface of the adapter plate 9 through the micro-displacement platform 10; the B / C rotating shaft 19 is fixed on the bottom plate 20, and the workpiece 21 to be processed is mounted on the B / C rotating shaft 19. The material storage tube 14 is filled with soluble gel material and connected to the electro-jet printing valve 15 . The nozzle of the electro-jet printing valve 15 can be replaced according to the characteristics of the actual strippable structure 22 .

[0013] Furthermore, the control module includes a cabinet 1, an operation panel 2, an electric field controller 3, a flow field controller 4 and an industrial computer 5. The industrial computer 5 controls the movement of the shaft; the operation panel 2 controls the flow field controller 4 through the industrial computer 5 to provide a stable driving force for the material storage tube 14; the operation panel 2 controls the electric field controller 3 to generate a high-voltage electric field for the electrojet printing valve 15, and various forms of electrojet printing manufacturing can be realized under appropriate flow supply and electric field.

[0014] The beneficial effects of the present invention include: The strippable structure printed by the electrofluidic printing technology of the present invention can achieve high-precision and high-resolution depiction of the gap pattern on the metal structure.

[0015] The present invention can realize large-area, high-efficiency deposition of a conductive metal layer on the surface of a workpiece and high-precision control of thickness through an electro-fluid printing technology in the form of electrospray.

[0016] The present invention can realize the movement and positioning functions of the workpiece and the nozzle required for complex surface processing during the printing process through the five-axis motion platform.

[0017] Compared with a single electrofluidic printing process, the complex curved micro-pattern printing-peeling conformal manufacturing method provided by the present invention retains the high-precision and high-resolution characteristics of electrofluidic printing, while avoiding the time waste and processing errors caused by cumbersome path planning and multiple depositions, thereby greatly improving manufacturing efficiency and precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a process of a printing-peeling conformal manufacturing method for complex curved surface micro-patterns according to an embodiment of the present invention; Figure 2A schematic diagram of a five-axis linkage electrofluid printing platform used in an embodiment of the present invention; Figure 3 A schematic diagram of preparing a peelable structure on a curved surface in an embodiment of the present invention; Figure 4 is a schematic diagram of preparing a conductive metal layer on a curved surface in an embodiment of the present invention; Figure 5 It is a schematic diagram of the dissolution and peeling process of the peelable structure in an embodiment of the present invention; Figure 6 Schematic diagram of sintering of a conductive metal layer in an embodiment of the present invention; In the figure: 1 cabinet; 2 operation panel; 3 electric field controller; 4 flow field controller; 5 industrial computer; 6 Z axis; 7 adapter plate; 8 XY motion platform; 9 adapter plate; 10 micro displacement platform; 11 laser curing device; 12 positioning camera; 13 laser rangefinder; 14 material storage tube; 15 electrojet printing valve; 16 observation camera; 17 fixture; 18 fixed back plate; 19 B / C rotating axis; 20 bottom plate; 21 workpiece; 22 peelable structure; 23 conductive metal layer; 24 dissolving stripping agent; 25 infrared heater. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the specific implementation modes of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] A printing-peeling conformal manufacturing method for complex curved surface micro-patterns, such as Figure 1 As shown, it can be mainly divided into four steps: Step 1: electrospray a strippable structure based on a gap structure pattern on a complex curved surface using a soluble gel material; Step 2: electrospray a conductive metal layer on the curved surface using a conductive metal ink; Step 3: place the workpiece in a dissolving stripping agent to remove the strippable structure and complete the etching of the gap structure on the conductive metal layer; and Step 4: heat the workpiece to complete the sintering of the conductive metal layer.

[0021] The specific process of each step is as follows: Step S1: Using soluble gel as the printing material, depositing it on the surface of a complex curved workpiece substrate in the form of an electric jet, and cooperating with a motion platform to achieve high-precision manufacturing of a peelable structure based on micro-pattern gaps.

[0022] First assemble as Figure 2The five-axis linkage electro-fluid printing platform shown includes a printing module and a control module. The printing module includes a Z axis 6, an adapter plate 7, an XY motion platform 8, an adapter plate 9, a micro-displacement platform 10, a laser curing device 11, a positioning camera 12, a laser rangefinder 13, a material storage tube 14, an electro-jet printing valve 15, an observation camera 16, a fixture 17, a fixed back plate 18, and a B / C rotating shaft 19. The Z axis 6 is mounted on the bottom plate 20 through the fixed back plate 18; the XY motion platform 8 is fixed on the Z axis 6 through the adapter plate 7; the adapter plate 9 is fixed to the lower surface of the XY motion platform; the positioning camera 12, the laser rangefinder 13, and the electro-jet printing valve 15 are fixed on the adapter plate 9 through the fixture 17; the laser curing device 11 and the observation camera 16 are fixed on the adapter plate 9 through the micro-displacement platform 10; and the B / C rotating shaft 19 is fixed on the bottom plate 20.

[0023] The control module is composed of a cabinet 1, an operation panel 2, an electric field controller 3, a flow field controller 4 and an industrial computer 5. The industrial computer 5 controls the movement of the axis through a numerical control G code program; the operation panel 2 controls the flow field controller 4 through the industrial computer 5 to provide a stable driving force for the material storage tube 14; the operation panel 2 generates a high-voltage electric field for the electrojet printing valve 15 by controlling the electric field controller 3, and various forms of electrojet printing manufacturing can be realized under appropriate flow supply and electric field.

[0024] Before printing and manufacturing the peelable structure 22, first, the workpiece 21 is firmly mounted on the B / C rotating shaft 19, and then the starting point for printing and manufacturing is determined. The storage tube 14 filled with soluble material is connected to the electrostatic printing valve 15, and the nozzle suitable for the peelable structure 22 is replaced. The model of the workpiece 21 is imported into the industrial computer 5, and the peelable structure 22 is laid on the surface of the workpiece 21. After path planning, the path planning code is generated, and a series of process parameters such as electric field parameters, flow field parameters, and printing height parameters in the printing process are added to generate the CNC printing G code. The G code of the peelable structure 22 is transmitted to the industrial computer 5, and the industrial computer 5 moves the laser rangefinder 13 to the starting point of the printing according to the position information fed back by the positioning camera 12. The industrial computer 5 collects the height information on the printing path through the laser rangefinder 13, and compensates the height of the nozzle during the printing process through the height information. The parameters of the laser curing device 11 are adjusted to focus the laser on the deposition site of the soluble material to achieve real-time curing during the printing process of the peelable structure.

[0025] like Figure 3 As shown, the industrial computer 5 will start sending the printing command to the Z axis 6, XY motion platform 8, B / C rotation axis 19, flow field controller 4, and electric field controller 3. The sol-gel forms a conical jet under the action of the electric field, and uses the laser curing device 11 to achieve precise curing to prevent the flow of the material from affecting the dimensional accuracy of the structure. In conjunction with the relative movement of the workpiece and the nozzle, a peelable structure 22 is printed on the surface of the workpiece 21, thereby obtaining the first intermediate piece.

[0026] The soluble gel material used in this embodiment is BP212 photoresist.

[0027] Step S2: Using conductive metal ink as the printing material, electrospray a metal conductive layer on the surface of the first intermediate component, thereby obtaining the second intermediate component. The details are as follows: Replace the storage tube 14 filled with conductive metal ink and the corresponding nozzle, plan a linear trajectory according to the single printing deposition area, and cover the surface of the workpiece 21 with the linear trajectory. Further, generate a path planning path code from the linear trajectory, add a series of process parameters to generate the CNC printing G code of the conductive metal layer 23, use the positioning camera 12 and the laser rangefinder 13 to perform positioning and height measurement, adjust the parameters of the laser curing device 11, focus the laser on the nanosilver ink deposition site, and realize real-time curing during the printing process of the conductive metal layer.

[0028] like Figure 4 As shown, the metal ink is deposited on the surface of the workpiece 21 in the form of electrospray, and through reasonable path planning and laser curing, the density and uniformity of the printed structure are ensured to achieve the preparation of the conductive metal layer 23.

[0029] The conductive metal ink used in this embodiment is nano silver ink.

[0030] Step S3: placing the second intermediate piece into a dissolving stripping agent of a sol-gel, and leaving it to stand until the strippable structure based on the sol-gel is completely stripped off, and the etching of the pattern on the metal structure is completed, thereby obtaining a third intermediate piece.

[0031] In this embodiment, step S3 is specifically as follows: like Figure 5 As shown, the workpiece with the metal layer 23 printed on it is removed and completely immersed in a container filled with a dissolving stripping agent 24, and left to stand for 40 minutes until all the strippable structures 22 on the surface of the workpiece 21 are dissolved and a gap pattern is etched on the surface of the conductive metal layer 23. The dissolving stripping agent used in this embodiment is a developer.

[0032] Step S4: heating the third intermediate piece according to the conductive ink sintering conditions so that the metal conductive layer reaches a preset conductive property. Figure 6 As shown, the workpiece 21 after the pattern etching on the surface of the conductive metal layer 23 is placed under the infrared heater 25, and the conductive metal layer is sintered according to the ink heating conditions to ensure the electrical performance.

[0033] In summary, the present invention provides a printing-peeling conformal manufacturing method for complex curved surface micro-patterns, which solves the problems of low resolution, low efficiency, low conformal degree, and high cost in the current manufacturing of complex curved surface micro-patterns. This method inherits the advantages of spatial freedom and high resolution of electrofluidic printing, while avoiding the time waste and dimensional errors caused by complex path planning and multiple depositions, and solves the problem of low efficiency in manufacturing large-format slit-type micro-patterns by electrofluidic printing technology, and can further improve the dimensional accuracy of the slit structure, and realize the high-efficiency and high-precision preparation of complex curved surface conformal micro-patterns.

[0034] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A printing-peeling conformal manufacturing method for complex curved surface micro-patterns, characterized in that: The following steps are involved: Using sol-gel as the printing material, depositing it on the surface of the complex curved workpiece substrate in the form of an electric jet, and cooperating with a moving platform to prepare a peelable structure on the surface of the complex curved workpiece, thereby forming a first intermediate piece; Using conductive metal ink as a printing material, forming a conductive metal layer on the surface of the first intermediate member by electrospraying, thereby obtaining a second intermediate member; placing the second intermediate piece into the dissolving and stripping agent of the sol-gel, and standing until the strippable structure based on the sol-gel is completely dissolved and stripped, and the etching of the surface pattern of the conductive metal layer is completed, thereby obtaining a third intermediate piece; The third intermediate piece is heated according to the conductive ink sintering conditions so that the conductive metal layer reaches a preset conductive property.

2. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: During the formation of the strippable structure, laser thermal curing treatment is performed to ensure the dimensional accuracy of the strippable structure and to prevent the metal layer from adhering to the sol-gel during the printing process.

3. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: During the printing process of the conductive metal layer, laser thermal curing treatment is performed to prevent the conductive metal ink from dissolving in the dissolving stripping agent and causing damage to the conductive metal layer.

4. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: The conductive metal ink is nano silver ink or nano copper ink.

5. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: The soluble glue is a photoresist or a protective glue.

6. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: The dissolving and stripping agent is a photoresist developer or a soluble corresponding dissolving agent.

7. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 1, characterized in that: The motion platform is a five-axis linkage motion platform.

8. The printing-peeling conformal manufacturing method of complex curved surface micro-patterns according to claim 7, characterized in that: The motion platform includes a printing module and a control module; The printing module comprises a Z axis (6), an adapter plate (7), an XY motion platform (8), an adapter plate (9), a micro-displacement platform (10), a laser curing device (11), a positioning camera (12), a laser rangefinder (13), a material storage tube (14), an electro-jet printing valve (15), an observation camera (16), a fixture (17), a fixed back plate (18), and a B / C rotating axis (19); the Z axis (6) is mounted on the bottom plate (20) via the fixed back plate (18); the XY motion platform (8) is fixed on the Z axis (6) via the adapter plate (7), and the adapter plate (9) is fixed to the XY motion platform (8). The positioning camera (12), the laser rangefinder (13), and the electro-jet printing valve (15) are all fixed to the adapter plate (9) by means of a clamp (17); the laser curing device (11) and the observation camera (16) are fixed to the lower surface of the adapter plate (9) by means of a micro-displacement platform (10); the B / C rotating shaft (19) is fixed to the bottom plate (20); the workpiece to be processed (21) is mounted on the B / C rotating shaft (19); the soluble gel material is placed in the material storage tube (14) and is connected to the electro-jet printing valve (15); the nozzle of the electro-jet printing valve (15) can be replaced according to the characteristics of the actual peelable structure (22); The control module comprises an operation panel (2), an electric field controller (3), a flow field controller (4) and an industrial computer (5); the industrial computer (5) controls the movement of each axis; the operation panel (2) controls the flow field controller (4) through the industrial computer (5) to provide a stable driving force for the material storage tube (14); the operation panel (2) generates a high-voltage electric field for the electrojet printing valve (15) by controlling the electric field controller (3) to realize various forms of electrojet printing manufacturing.

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