High-precision curved surface transfer device and method

Abstract

The application relates to the field of curved surface transfer printing, in particular to a high-precision curved surface transfer printing device and method. The device comprises a mechanical part and an upper computer part, the mechanical part comprises a bearing frame module, a motion control module, an electric cylinder motion module, a module motion module, a scraping module, a glue head centering module and an alignment module. Firstly, a conformal algorithm is used, modeling simulation and experiment are combined in simulation software, the position mapping relationship between the plane and the curved surface under the deformation of the glue head is obtained, the required pattern is calculated, the pattern is prepared on a template, high-precision alignment is carried out through an alignment rod and an alignment plate, the plane pattern on the template is picked up by the flexible glue head and is released to the curved surface, so that high-precision and high-efficiency transfer printing of the curved surface pattern is realized, and the flexibility of the transfer printing equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of curved surface transfer printing, and more particularly to a high-precision curved surface transfer printing device and method. Background Technology

[0002] Transfer printing is a technique for assembling and transferring material from a donor substrate to a recipient substrate. Its basic process includes two stages: pick-up and release. In the pick-up stage, a stamp is used to peel the device from the source substrate; in the release stage, the device is released onto the surface of a flexible / bent target substrate. In pattern transfer printing, a pattern can first be created on a planar substrate, and then the pattern can be transferred from the planar substrate to a curved surface using transfer printing technology.

[0003] Transfer printing technology has great potential in the field of curved surface pattern preparation, but it still faces many challenges. The most pressing problem to be solved is how to transfer patterns from a flat surface to a curved surface with high precision and efficiency.

[0004] Chinese invention patent CN202310750819.9, "A curved surface transfer device and method suitable for flexible electronic devices," proposes a curved surface transfer device for flexible electronic devices. By controlling a densely arranged array of pin pressure and distance sensors, the device achieves the adsorption and deformation of the flexible electronic devices, effectively reducing damage and achieving non-destructive transfer. However, this device is limited in its ability to transfer on surfaces with high curvature.

[0005] Chinese invention patent CN202010534781.8, "A Curved Surface Transfer Device and Method for Flexible Electronic Devices," provides a curved surface transfer device and method for flexible electronic devices. The transfer device uses a push-pull mechanism to move a curved part into and out of a cavity. When the curved part enters the cavity, an elastic membrane deforms, pressing the flexible electronic device onto the curved part, thus achieving adhesion between the flexible electronic device and the curved part. The mechanized operation results in good transfer repeatability, and the uniform force applied to the elastic membrane promotes tight adhesion. Although this method can achieve high curved surface positioning accuracy, because it relies on the deformation of the elastic membrane to press the flexible electronic device onto the curved part, it cannot guarantee high geometric accuracy of the flexible electronic device on the target substrate surface after transfer.

[0006] Chinese invention patent CN201610535950.3, "A Thin Film Transfer Device and Method Based on a Thermodegradable Flexible Stamp," describes a thin film transfer device and method based on a thermodegradable flexible stamp. This device uses a poly(α-methylstyrene) polymer loaded on a heating plate as a transfer stamp. Global heating causes the polymer to thermally degrade, allowing the thin film or functional layer of the device on the flexible stamp to peel off to the target substrate in a simple and controllable manner, thereby selectively transferring the functional units onto the target substrate. This invention is suitable for the automated fabrication of large-scale inorganic flexible and stretchable electronic devices; however, the use of thermal degradation reduces efficiency and results in poor adaptability. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and to invent a high-precision curved surface transfer device and method. This invention aims to overcome problems such as poor positioning and geometric accuracy, low efficiency, and poor adaptability on the target substrate surface during pattern transfer. A high-precision curved surface transfer device and method are designed. First, a conformal algorithm is used, combining modeling and simulation in simulation software with experiments to obtain the positional mapping relationship between the plane and the curved surface under the deformation of the adhesive head. Based on this, the desired pattern is calculated. Then, the pattern is prepared on a die, and high-precision alignment is performed using an alignment rod and alignment plate. Finally, a flexible adhesive head picks up the pattern on the die and releases it onto the curved surface, thereby achieving high-precision and high-efficiency transfer of curved surface patterns.

[0008] The technical solution of this invention:

[0009] A high-precision curved surface transfer device, comprising a mechanical part and a host computer part; the mechanical part includes a load-bearing frame module 1, a motion control module 2, an electric cylinder motion module 3, a module motion module 4, a scraping module 5, a glue head centering module 6, and an alignment module 7.

[0010] The load-bearing frame module 1 includes a support frame 1-1 and an optical breadboard 1-2; the support frame 1-1 is a base, and its top surface is provided with an optical breadboard 1-2 with through holes; the load-bearing frame module 1 is equipped with a motion control module 2; the upper surface of the load-bearing frame module 1 is equipped with an electric cylinder motion module 3, a module motion module 4 and a scraping module 5;

[0011] Motion control module 2 includes a base plate 2-1, a module driver 2-2, an electric cylinder driver 2-3, a motion controller 2-4, an analog-to-digital converter module 2-5, a weighing transmitter 2-6, a DC switching power supply A2-7, and a DC switching power supply B2-8. The bottom of the base plate 2-1 is connected to the support frame 1-1. The module driver 2-2, electric cylinder driver 2-3, motion controller 2-4, analog-to-digital converter module 2-5, weighing transmitter 2-6, DC switching power supply A2-7, and DC switching power supply B2-8 are mounted on the top of the base plate 2-1. DC switching power supply A2-7 is the electric cylinder driver 2. -3 provides voltage; DC switching power supply B2-8 provides voltage to module driver 2-2, motion controller 2-4, analog-to-digital converter module 2-5, and weighing transmitter 2-6; module driver 2-2 is used to drive module 4-2; electric cylinder driver 2-3 is used to drive electric cylinder 3-8; motion controller 2-4 is used to send drive signals to module driver 2-2 and electric cylinder driver 2-3; analog-to-digital converter module 2-5 is used to convert the analog signal of weighing transmitter 2-6 into a digital signal; weighing transmitter 2-6 is used to convert the pressure on weighing sensor 3-9 into an analog signal.

[0012] The electric cylinder motion module 3 includes a portal-shaped support and reinforcement frame, an electric cylinder 3-8, and a weighing sensor 3-9. The electric cylinder 3-8 passes through the top of the portal-shaped support and reinforcement frame and is mounted on the portal-shaped support and reinforcement frame via a flange. The weighing sensor 3-9 is mounted on the external thread of the push rod of the electric cylinder 3-8 through a threaded hole and is used to measure the magnitude of the output thrust of the electric cylinder 3-8 when it is working. The module motion module 4 includes two module pads 4-1, a module 4-2, a stencil mounting plate 4-3, and a stencil 4-4. The two module pads 4-1 are installed in parallel above the optical breadboard 1-2, with a fixed distance between them. The module 4-2 is installed above the two module pads 4-1. The stencil mounting plate 4-3 is installed on the sliding platform of the module 4-2. The stencil 4-4 is installed on the stencil mounting plate 4-3, and has a pattern on it and pin holes on both sides. During the picking stage, the pattern is picked up by contacting the glue head 6-1 and is attached to the glue head 6-1. The pin holes are used to precisely position the stencil 4-4 on the stencil mounting plate 4-3.

[0013] The scraping module 5 includes a support rod 5-1, an oil cup fixing plate 5-2, and an oil cup 5-3; the bottom end of the support rod 5-1 is installed above the optical bread board 1-2; the oil cup fixing plate 5-2 is installed on the top of the four support rods 5-1 through through holes, and the through hole in the middle of the oil cup fixing plate 5-2 is used to fix the position of the oil cup 5-3; the oil cup 5-3 is fitted into the middle round through hole of the oil cup fixing plate 5-2 and is located above the engraving plate 4-4.

[0014] The rubber head alignment module 6 includes a rubber head 6-1, a rubber head fixing plate 6-2, an alignment clamp A6-3, an alignment clamp B6-4, and a rubber head seat 6-5. The rubber head 6-1 is fixed to the rubber head fixing plate 6-2 by a mold during fluid solidification. During pickup and release, its precise deformation ensures high geometric accuracy of the transferred pattern on the workpiece 7-3 surface. The alignment clamp A6-3 is located below the rubber head fixing plate 6-2, and the rubber head 6-1 passes through the central through-hole of the alignment clamp A6-3. The stepped surface of the alignment clamp B6-4 is mounted on the upper surface of the alignment clamp A6-3, and the central through-hole at the top of the alignment clamp B6-4 is used for the threaded exit of the rubber head seat 6-5. The rubber head seat 6-5 is mounted above the rubber head fixing plate 6-2 by self-tapping screws, and the other end is threadedly connected to the lower part of the electric cylinder motion module 3.

[0015] The alignment module 7 includes a workpiece mounting platform 7-1, a workpiece centering plate 7-2, a workpiece 7-3, a scribe plate mounting plate 4-3, two alignment rods 7-4, and an electric cylinder centering plate 7-5. The workpiece mounting platform 7-1 is mounted on top of the optical breadboard 1-2 through a specially designed threaded through hole. The through hole in the middle of the workpiece centering plate 7-2 is used to determine the position of the workpiece 7-3. After alignment, the workpiece 7-3 is mounted on the workpiece mounting platform 7-1, and the scribe plate mounting plate 4-3 is mounted on the sliding platform of the module 4-2. The electric cylinder centering plate 7-5 is mounted on the lower surface of the front flange of the electric cylinder 3-8, and the pin holes on both sides are used to precisely position the electric cylinder centering plate 7-5 and the electric cylinder 3-8.

[0016] The host computer is connected to motion controllers 2-4.

[0017] Furthermore, the precise deformation of the rubber head 6-1 during the two stages of pickup and release is obtained by conducting material mechanics tests, namely material tensile tests and material compression tests, to obtain deformation experimental data of the rubber head 6-1. Then, the obtained experimental data is used to fit an image, and the obtained fitted image is used to establish a hyperelastic constitutive model of the rubber head 6-1. Finally, simulation is performed to obtain the precise deformation required for different patterns, so as to realize the transfer of different patterns from a plane to an irregular curved surface.

[0018] Furthermore, the centering clamps A6-3 and B6-4 are precisely positioned by pin holes, and the central through holes of the centering clamps A6-3 and B6-4 are used to ensure the positional accuracy between the rubber head 6-1 and the rubber head seat 6-5.

[0019] Furthermore, the pattern on the die 4-4 is obtained by using a conformal algorithm to obtain the positional mapping relationship between the plane and the curved surface. Then, the corresponding two-dimensional pattern data is calculated by using the three-dimensional pattern data formed after the transfer on the workpiece 7-3. The pattern is then prepared on the die 4-4. In this way, the corresponding two-dimensional pattern data on the die 4-4 can be obtained according to different workpiece 7-3 surfaces and the three-dimensional pattern formed after the transfer, and prepared on the die 4-4. The pattern on the die 4-4 can be quickly replaced and used through a standard threaded hole.

[0020] Furthermore, the oil cup 5-3 includes a cup body, a magnet, and a blade ring. The cup body is fitted inside the central through hole of the oil cup fixing plate 5-2. The function of the cup body is to store ink and replenish ink to the pattern when the pattern on the engraving plate 4-4 moves to the bottom of the oil cup 5-3. The magnet is installed inside the cup body and its function is to attract the oil cup 5-3 to the engraving plate 4-4. The blade ring is installed below the cup body and contacts the engraving plate 4-4. The function of the blade ring is to scrape off excess ink from the pattern when the pattern on the engraving plate 4-4 moves out of the cup body of the oil cup 5-3.

[0021] Furthermore, each end of the electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 has two through holes, which form a clearance fit with the two alignment rods 7-4. When the two alignment rods 7-4 pass through the two through holes on the electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 respectively, that is, when the two through holes on the electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 coincide in the vertical direction, after the rubber head 6-1 and the engraving plate 4-4 are respectively installed on the electric cylinder 3-8 and the engraving plate 4-3, the patterns on the rubber head 6-1 and the engraving plate 4-4 are aligned with the workpiece 7-3 with high precision.

[0022] Furthermore, the supporting and reinforcing frame includes two support plates 3-1, two lower reinforcing plates 3-2, two left reinforcing plates 3-3, two middle reinforcing plates 3-4, two right reinforcing plates 3-5, four upper reinforcing plates 3-6, and a crossbeam 3-7. The support plates 3-1 and lower reinforcing plates 3-2 are respectively installed above the optical breadboard 1-2 through threaded through holes on the optical breadboard 1-2. The two left reinforcing plates 3-3, two middle reinforcing plates 3-4, and two right reinforcing plates 3-5 are respectively symmetrically installed on the inner sides of the two support plates 3-1 to increase the stability of the support plates 3-1. The crossbeam 3-7 is installed above the two support plates 3-1. The four upper reinforcing plates 3-6 are respectively installed at both ends of the lower surface of the crossbeam 3-7 and fixed to the two support plates 3-1 to reinforce the installation of the crossbeam 3-7 and the two support plates 3-1.

[0023] A high-precision curved surface transfer method, wherein the high-precision curved surface transfer method is implemented by the aforementioned high-precision curved surface transfer device, includes the following steps:

[0024] Step 1: Establish a hyperelastic constitutive model of the rubber head 6-1 material in the simulation software, and simulate the two processes of picking up in the plane and releasing on the curved surface;

[0025] Step 2: Analyze the displacement trend of the surface of the rubber head 6-1 in the plane and curved surfaces during the simulation process, and design the corresponding two-dimensional pattern 4-4a based on the displacement trend;

[0026] Step 3: Prepare the designed planar pattern and conduct experiments to obtain experimental data for the three-dimensional pattern 7-3c. Measure the displacement gradient of the two-dimensional pattern 4-4a transferred to the three-dimensional pattern 7-3c during the experiment.

[0027] Step 4: Based on the obtained displacement gradient, obtain the positional mapping relationship between the lower plane and the curved surface of the rubber head 6-1 under deformation;

[0028] Step 5: Calculate the data of the two-dimensional pattern 4-4a corresponding to the three-dimensional pattern 7-3c by using the positional mapping relationship between the obtained plane and the curved surface;

[0029] Step 6: Based on the obtained pattern data, prepare the two-dimensional pattern 4-4a on the stencil 4-4;

[0030] Step 7: Place workpiece 7-3 on workpiece mounting table 7-1, and fit the center round through hole of workpiece centering plate 7-2 onto workpiece 7-3;

[0031] Step 8: The mounting plate 4-3 is installed on the sliding platform of module 4-2, and the two have a certain range of relative movement.

[0032] Step 9: Adjust the positions of the engraving plate 4-3 and the workpiece centering plate 7-2 so that the two alignment rods 7-4 pass through the two through holes on the electric cylinder centering plate 7-5, the engraving plate 4-3 and the workpiece centering plate 7-2 from top to bottom;

[0033] Step 10: Fix the stencil mounting plate 4-3 to the sliding platform of module 4-2, and position the stencil 4-4 on the stencil mounting plate 4-3 by pins;

[0034] Step 11: Fix workpiece 7-3 on workpiece mounting table 7-1, fix the relative positions of the two, and remove workpiece centering plate 7-2 and two alignment rods 7-4;

[0035] Step 12: Install the rubber head centering module 6 below the electric cylinder motion module 3. At this time, the pattern on the rubber head 6-1 and the engraving plate 4-4 is aligned with the workpiece 7-3 with high precision.

[0036] Step 13: After the module 4-2 moves and moves the pattern on the engraving plate 4-4 to below the oil cup 5-3, the oil cup 5-3 replenishes the pattern with ink, and then the module 4-2 moves and moves the engraving plate 4-4 to move the pattern back to the corresponding position below the glue head 6-1.

[0037] Step 14: The electric cylinder 3-8 moves, causing the rubber head 6-1 to pick up the pattern on the engraving plate 4-4 and return to its original position;

[0038] Step 15: The movement of module 4-2 causes the pattern on plate 4-4 to return to the bottom of oil cup 5-3;

[0039] Step 16: The electric cylinder 3-8 moves, causing the pattern picked up on the rubber head 6-1 to be released onto the surface of the workpiece 7-3 and then return to its original position.

[0040] The beneficial effects of this invention are: compared with the prior art, the high-precision curved surface transfer device proposed in this invention not only achieves high-precision and high-efficiency transfer on the curved surface of the target substrate during pattern transfer, but also improves the flexibility of the curved surface transfer device. Attached Figure Description

[0041] Figure 1 This is an overall structural diagram of a high-precision curved surface transfer device.

[0042] Figure 2 This is a structural diagram of the load-bearing frame module of a high-precision curved surface transfer device.

[0043] Figure 3 This is a structural diagram of the motion control module of a high-precision curved surface transfer device.

[0044] Figure 4 This is a structural diagram of the electric cylinder motion module of a high-precision curved surface transfer device.

[0045] Figure 5 This is a structural diagram of the motion module of a high-precision curved surface transfer device.

[0046] Figure 6 This is a structural diagram of the scraping module of a high-precision curved surface transfer device.

[0047] Figure 7(a) is a structural diagram of the glue head centering module of a high-precision curved surface transfer device.

[0048] Figure 7(b) is a cross-sectional view of the glue head centering module of a high-precision curved surface transfer device.

[0049] Figure 8 This is a structural diagram of the alignment module of a high-precision curved surface transfer device.

[0050] Figure 9 This is a schematic diagram of the die structure of a high-precision curved surface transfer device.

[0051] Figure 10(a) is a structural diagram of the workpiece before transfer in a high-precision curved surface transfer device.

[0052] Figure 10(b) is a structural diagram of the workpiece after transfer using a high-precision curved surface transfer device.

[0053] Figure 11 This is a flowchart of the conformal algorithm for a high-precision surface transfer device.

[0054] Figure 12(a) is a structural diagram of a saddle-shaped curved surface before transfer in a high-precision curved surface transfer device.

[0055] Figure 12(b) is a structural diagram of a saddle-shaped curved surface after transfer using a high-precision curved surface transfer device.

[0056] In the diagram: 1-Supporting frame module, 2-Motion control module, 3-Electric cylinder motion module, 4-Module motion module, 5-Scraping module, 6-Glue head centering module, 7-Alignment module, 1-1-Support frame, 1-2-Optical breadboard, 2-1-Base plate, 2-2-Module driver, 2-3-Electric cylinder driver, 2-4-Motion controller, 2-5-Analog-to-digital converter module, 2-6-Weighing transmitter, 2-7-DC switching power supply A, 2-8-DC switching power supply B, 3-1-Support plate, 3-2-Lower reinforcing plate, 3-3-Left reinforcing plate, 3-4-Middle... Reinforcing plate, 3-5-Right reinforcing plate, 3-6-Upper reinforcing plate, 3-7-Crossbeam, 3-8-Electric cylinder, 3-9-Weighing sensor, 4-1-Module pad, 4-2-Module, 4-3-Engraving plate mounting plate, 4-4-Engraving plate, 5-1-Support rod, 5-2-Oil cup fixing plate, 5-3-Oil cup, 6-1-Glue head, 6-2-Glue head fixing plate, 6-3-Centering clamp A, 6-4-Centering clamp B, 6-5-Glue head seat, 7-1-Workpiece mounting platform, 7-2-Workpiece centering plate, 7-3-Workpiece, 7-4-Alignment rod and 7-5-Electric cylinder centering plate. 4-4a Two-dimensional pattern; 4-4b Plane; 7-3a Lower flange; 7-3b Printing surface; 7-3c Three-dimensional pattern; Detailed Implementation

[0057] The specific embodiments of the present invention are described in detail below with reference to the technical solutions and accompanying drawings.

[0058] A specific embodiment is taken as an example of a hemispherical radar dome workpiece.

[0059] A high-precision curved surface transfer device mainly consists of a mechanical part and a host computer part. The mechanical part mainly consists of a load-bearing frame module 1, a motion control module 2, an electric cylinder motion module 3, a module motion module 4, a scraping module 5, a glue head centering module 6, and an alignment module 7.

[0060] The load-bearing frame module 1 mainly consists of a support frame 1-1 and an optical breadboard 1-2. The support frame 1-1 is assembled to form a base, and the motion control module 2 is arranged inside the base. The optical breadboard 1-2 has through holes on its surface and is connected to the support frame 1-1 by elastic nuts and bolts placed in the support frame 1-1. The electric cylinder motion module 3, the module motion module 4, and the scraper module 5 are mounted on the upper surface of the load-bearing frame module 1.

[0061] The motion control module 2 includes a base plate 2-1, a module driver 2-2, an electric cylinder driver 2-3, a motion controller 2-4, an analog-to-digital converter module 2-5, a weighing transmitter 2-6, a DC switching power supply A2-7, and a DC switching power supply B2-8. The base plate 2-1 has through holes on its surface. Its upper surface contacts the module driver 2-2, the electric cylinder driver 2-3, the motion controller 2-4, the analog-to-digital converter module 2-5, the weighing transmitter 2-6, the DC switching power supply A2-7, and the DC switching power supply B2-8, and is connected to them by hexagonal screws. Its lower surface contacts the support frame 1-1 and is connected to it by elastic nuts and hexagonal screws placed in the support frame 1-1.

[0062] The electric cylinder motion module 3 includes two support plates 3-1, two lower reinforcing plates 3-2, two left reinforcing plates 3-3, two middle reinforcing plates 3-4, two right reinforcing plates 3-5, four upper reinforcing plates 3-6, a crossbeam 3-7, an electric cylinder 3-8, and a weighing sensor 3-9. The support plates 3-1 and lower reinforcing plates 3-2 are mounted above the optical breadboard 1-2 of the load-bearing frame module 1 using hexagonal socket head cap screws. The two left reinforcing plates 3-3, two middle reinforcing plates 3-4, and two right reinforcing plates 3-5 are connected to the support plates 3-1 and lower reinforcing plates 3-2 respectively using hexagonal socket head cap screws. The crossbeam 3-7 is mounted above the two support plates 3-1 using hexagonal socket head cap screws. The four upper reinforcing plates 3-6 are connected to the crossbeam 3-7 and support plates 3-1 respectively using hexagonal socket head cap screws. The non-standard flange of the electric cylinder 3-8 has through holes and is mounted to the crossbeam 3-7 using hexagonal socket head cap screws. The load cell 3-9 is installed on the external thread of the push rod of the electric cylinder 3-8 via a threaded connection.

[0063] The module motion module 4 includes two module pads 4-1, a module 4-2, a plate mounting plate 4-3, and a plate 4-4.

[0064] The two module pads 4-1 have countersunk holes and threaded through holes. The countersunk holes are used to mount the module 4-2 onto the optical breadboard 1-2 using hex socket screws. The threaded through holes are used to secure the module 4-2.

[0065] Module 4-2 is located above the two module pads 4-1. Its main function is to move the engraving plate 4-4 to a designated position. Before the glue head 6-1 performs the picking operation, it moves the engraving plate 4-4 to move the two-dimensional pattern 4-4a on the engraving plate 4-4 to a designated position below the glue head 6-1. Before the glue head 6-1 performs the release operation and when replenishing ink, it moves the engraving plate 4-4 back to below the oil cup 5-3.

[0066] The mounting plate 4-3 has a slotted through hole and a threaded through hole. The slotted through hole is used to mount the plate to the sliding platform of module 4-2 using hex socket screws. The threaded through hole is used to fix the plate 4-4.

[0067] The upper surface of the die 4-4 includes a two-dimensional pattern 4-4a and a plane 4-4b, which are mounted on the die mounting plate 4-3 by hexagonal screws and locating pins.

[0068] The required pattern can be calculated using the modular motion module 4 based on the conformal algorithm, and the required two-dimensional pattern 4-4a can be prepared on the stencil 4-4, thereby improving the flexibility of the picking module.

[0069] The scraping module 5 includes four support rods 5-1, an oil cup fixing plate 5-2, and an oil cup 5-3. The four support rods 5-1 are threadedly connected and installed above the optical breadboard 1-2 of the load-bearing frame module 1. They have a through hole in the center to fix the position of the oil cup 5-3. The oil cup 5-3 includes a cup body, a magnet, and a blade ring. The cup body is fitted into the through hole in the center of the oil cup fixing plate 5-2. The function of the cup body is to store ink and replenish the ink for the pattern on the engraving plate 4-4 when it moves to the bottom of the oil cup 5-3. The magnet is installed inside the cup body and its function is to attract the oil cup 5-3 to the engraving plate 4-4. The blade ring is installed below the cup body and contacts the engraving plate 4-4. The function of the blade ring is to scrape off the excess ink on the pattern when it moves out of the cup body of the oil cup 5-3.

[0070] The glue head alignment module 6 includes a glue head 6-1, a glue head fixing plate 6-2, an alignment clamp A 6-3, an alignment clamp B 6-4, and a glue head seat 6-5.

[0071] The rubber head 6-1 is fixed to the rubber head fixing plate 6-2 by a mold during fluid solidification. The centering clamp A6-3 has a through hole in its center, which forms a clearance fit with the outer cylindrical surface of the rubber head 6-1. The centering clamp B6-4 has a through hole in its center, which forms a clearance fit with the shaft below the external thread of the rubber head seat 6-5. The rubber head seat 6-5 is installed below the electric cylinder motion module 3 via a threaded connection. The centering clamps A6-3 and B6-4 are connected by hexagonal socket screws and locating pins for positioning. The function of the centering clamps A6-3 and B6-4 is to ensure accurate positioning between the rubber head 6-1 and the rubber head seat 6-5.

[0072] When installing the rubber head centering module 6, first ensure the fit between the centering clamp A6-3 and the rubber head 6-1, and between the centering clamp B6-4 and the rubber head seat 6-5. Then, use hex socket screws and locating pins to position and connect the centering clamp A6-3 and the centering clamp B6-4. Finally, use self-tapping screws to pass through the through hole above the centering clamp B6-4 to fix the rubber head fixing plate 6-2 and the rubber head seat 6-5.

[0073] The precise deformation of the rubber head 6-1 during the two stages of pickup and release is obtained by conducting material mechanics tests, namely material tensile tests and material compression tests, to obtain deformation experimental data of the rubber head 6-1. Then, the obtained experimental data is used to fit an image, and a hyperelastic constitutive model of the rubber head 6-1 is established based on the fitted image. Finally, simulation is performed to obtain the precise deformation required for different patterns, so as to realize the transfer of different patterns from a plane to an irregular curved surface.

[0074] The alignment module 7 consists of a workpiece mounting platform 7-1, a workpiece centering plate 7-2, a workpiece 7-3, a die mounting plate 4-3, two alignment rods 7-4, and an electric cylinder centering plate 7-5.

[0075] The workpiece mounting table 7-1 has a countersunk hole and a threaded through hole. The countersunk hole is used to connect to the optical breadboard 1-2 through an internal hex screw, and the threaded through hole is used to connect to the workpiece 7-3 through an internal hex screw.

[0076] The workpiece centering plate 7-2 has a through hole at its center, which forms a clearance fit with the largest circle of the hemispherical part of the workpiece 7-3. The purpose of this fit is to ensure the precise position between the workpiece centering plate 7-2 and the workpiece 7-3. The electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 each have two circular through holes at both ends, forming a clearance fit with two alignment rods 7-4. The purpose of this fit is that when the two alignment rods 7-4 pass through the two through holes on the electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 respectively, i.e., when the two through holes on the electric cylinder centering plate 7-5, the engraving plate 4-3, and the workpiece centering plate 7-2 coincide in the vertical direction, after the rubber head 6-1 and the engraving plate 4-4 are respectively installed on the electric cylinder 3-8 and the engraving plate 4-3, the patterns on the rubber head 6-1 and the engraving plate 4-4 are aligned with the workpiece 7-3 with high precision.

[0077] The workpiece 7-3 can be of different shapes. Although the surface curvature, size and transfer pattern are different between different shapes, they all have a lower flange 7-3a and a printing surface 7-3b. After the transfer, the surface of the workpiece 7-3 will have a three-dimensional pattern 7-3c.

[0078] During positioning and alignment, the stencil mounting plate 4-3 and the workpiece 7-3 are installed onto the sliding platform and workpiece mounting table 7-1 of module 4-2 using hex socket screws. They are not completely fixed and have a certain range of motion. By fine-tuning the stencil mounting plate 4-3 and the workpiece 7-3, the two alignment rods 7-4 are made to pass through the round holes on both sides of the electric cylinder centering plate 7-5, the stencil mounting plate 4-3, and the workpiece centering plate 7-2 in sequence. Then, the hex socket screws are tightened to completely fix the stencil mounting plate 4-3 and the workpiece 7-3 onto the sliding platform and workpiece mounting table 7-1 of module 4-2. Finally, the two alignment rods 7-4 and the workpiece centering plate 7-2 are removed to complete the positioning and alignment.

[0079] Conformal Algorithm:

[0080] S1. Establish a hyperelastic constitutive model of the rubber head 6-1 material in the simulation software, and simulate the two processes of picking up in the plane and releasing in the curved surface.

[0081] S2. Analyze the displacement trend of the rubber head 6-1 surface in the plane and curved surface during the simulation process, and design the corresponding two-dimensional pattern 4-4a based on the displacement trend.

[0082] S3. Prepare the designed two-dimensional pattern 4-4a and conduct experiments to obtain experimental data of the three-dimensional pattern 7-3c. Measure the data displacement gradient of the two-dimensional pattern 4-4a transferred to the three-dimensional pattern 7-3c during the experiment.

[0083] S4. Based on the obtained displacement gradient, obtain the positional mapping relationship between the lower plane and the curved surface of the rubber head 6-1 under deformation.

[0084] S5. Calculate the required pattern by using the positional mapping relationship between the obtained plane and the curved surface.

[0085] The high-precision curved surface transfer device of the present invention has the following positioning and alignment process:

[0086] T1. After placing the workpiece 7-3 into the center hole of the workpiece centering plate 7-2, install it on the workpiece mounting table 7-1 with hexagon socket screws. The two are not completely fixed and have a certain range of motion.

[0087] T2. Install the mounting plate 4-3 onto the sliding platform of module 4-2 using hex socket screws. The two are not completely fixed and have a certain range of motion.

[0088] T3. Pass the two alignment rods 7-4 through the round holes on both sides of the electric cylinder centering plate 7-5, the engraving plate mounting plate 4-3, and the workpiece centering plate 7-2 in sequence.

[0089] T4. Fix workpiece 7-3 to workpiece mounting platform 7-1 with hex socket screws. Mount plate 4-3 on the sliding platform of module 4-2 with hex socket screws and fix it completely.

[0090] T5. By finely adjusting the caliper mounting plate 4-3 and the workpiece 7-3, the two alignment rods 7-4 pass through the round holes on both sides of the electric cylinder centering plate 7-5, the caliper mounting plate 4-3, and the workpiece centering plate 7-2 in sequence.

[0091] T6. Tighten the hex socket screws to completely fix the plate mounting plate 4-3 and workpiece 7-3 to the sliding platform of module 4-2 and the workpiece mounting table 7-1.

[0092] T7. Remove the two alignment rods 7-4 and the workpiece centering plate 7-2.

[0093] The high-precision curved surface transfer device described in this invention has the following transfer process:

[0094] U1. Install the rubber head centering module 6 below the electric cylinder motion module 3. At this time, the pattern on the rubber head 6-1 and the engraving plate 4-4 is aligned with the workpiece 7-3 with high precision.

[0095] U2, the movement of module 4-2 moves the pattern on the engraving plate 4-4 to below the oil cup 5-3 and then moves it out, moving the pattern to the corresponding position below the rubber head 6-1;

[0096] U3 and the electric cylinder 3-8 move, causing the rubber head 6-1 to pick up the pattern on the engraving plate 4-4 and return to its original position;

[0097] U4 and module 4-2 move to bring the pattern on plate 4-4 back below the oil cup 5-3;

[0098] U5 and the electric cylinder 3-8 move, causing the pattern picked up on the rubber head 6-1 to be released onto the surface of the workpiece 7-3 and then return to its original position.

[0099] Specific embodiment two: Taking a saddle-shaped curved surface workpiece as an example.

[0100] Conformal Algorithm:

[0101] S1. Establish a hyperelastic constitutive model of the rubber head 6-1 material in the simulation software, and simulate the two processes of picking up in the plane and releasing in the curved surface.

[0102] S2. Analyze the displacement trend of the rubber head 6-1 surface in the plane and curved surface during the simulation process, and design the corresponding two-dimensional pattern 4-4a based on the displacement trend.

[0103] S3. Prepare the designed two-dimensional pattern 4-4a and conduct experiments to obtain experimental data of the three-dimensional pattern 7-3c. Measure the data displacement gradient of the two-dimensional pattern 4-4a transferred to the three-dimensional pattern 7-3c during the experiment.

[0104] S4. Based on the obtained displacement gradient, obtain the positional mapping relationship between the lower plane and the curved surface of the rubber head 6-1 under deformation.

[0105] S5. Calculate the required pattern by using the positional mapping relationship between the obtained plane and the curved surface.

[0106] The high-precision curved surface transfer device of the present invention has the following positioning and alignment process:

[0107] T1. After placing the workpiece 7-3 into the center hole of the workpiece centering plate 7-2, install it on the workpiece mounting table 7-1 with hexagon socket screws. The two are not completely fixed and have a certain range of motion.

[0108] T2. Install the mounting plate 4-3 onto the sliding platform of module 4-2 using hex socket screws. The two are not completely fixed and have a certain range of motion.

[0109] T3. Pass the two alignment rods 7-4 through the round holes on both sides of the electric cylinder centering plate 7-5, the engraving plate mounting plate 4-3, and the workpiece centering plate 7-2 in sequence.

[0110] T4. Fix workpiece 7-3 to workpiece mounting platform 7-1 with hex socket screws. Mount plate 4-3 on the sliding platform of module 4-2 with hex socket screws and fix it completely.

[0111] T5. By finely adjusting the caliper mounting plate 4-3 and the workpiece 7-3, the two alignment rods 7-4 pass through the round holes on both sides of the electric cylinder centering plate 7-5, the caliper mounting plate 4-3, and the workpiece centering plate 7-2 in sequence.

[0112] T6. Tighten the hex socket screws to completely fix the plate mounting plate 4-3 and workpiece 7-3 to the sliding platform of module 4-2 and the workpiece mounting table 7-1.

[0113] T7. Remove the two alignment rods 7-4 and the workpiece centering plate 7-2.

[0114] The high-precision curved surface transfer device described in this invention has the following transfer process:

[0115] U1. Install the rubber head centering module 6 below the electric cylinder motion module 3. At this time, the pattern on the rubber head 6-1 and the engraving plate 4-4 is aligned with the workpiece 7-3 with high precision.

[0116] U2, after the movement of module 4-2 moves the pattern on the engraving plate 4-4 to below the oil cup 5-3, the oil cup 5-3 replenishes the pattern with ink, and then the movement of module 4-2 moves the engraving plate 4-4 back to the corresponding position below the glue head 6-1;

[0117] U3 and the electric cylinder 3-8 move, causing the rubber head 6-1 to pick up the pattern on the engraving plate 4-4 and return to its original position;

[0118] U4 and module 4-2 move to bring the pattern on plate 4-4 back below the oil cup 5-3;

[0119] U5 and the electric cylinder 3-8 move, causing the pattern picked up on the rubber head 6-1 to be released onto the surface of the workpiece 7-3 and then return to its original position.

Claims

1. A high-precision curved surface transfer method, characterized in that, The high-precision curved surface transfer method is achieved by a high-precision curved surface transfer device, which includes a mechanical part and a host computer part; the mechanical part includes a load-bearing frame module (1), a motion control module (2), an electric cylinder motion module (3), a module motion module (4), a scraping module (5), a glue head centering module (6), and an alignment module (7). The load-bearing frame module (1) includes a support frame (1-1) and an optical breadboard (1-2); the support frame (1-1) is a base, and its top surface is provided with an optical breadboard (1-2) with through holes; the load-bearing frame module (1) is equipped with a motion control module (2); the upper surface of the load-bearing frame module (1) is equipped with an electric cylinder motion module (3), a module motion module (4) and a scraping module (5); The motion control module (2) includes a base plate (2-1), a module driver (2-2), an electric cylinder driver (2-3), a motion controller (2-4), an analog-to-digital converter (2-5), a weighing transmitter (2-6), a DC switching power supply A (2-7), and a DC switching power supply B (2-8); the bottom of the base plate (2-1) is connected to the support frame (1-1); the module driver (2-2), the electric cylinder driver (2-3), the motion controller (2-4), the analog-to-digital converter (2-5), the weighing transmitter (2-6), the DC switching power supply A (2-7), and the DC switching power supply B (2-8) are mounted on the top of the base plate (2-1); the DC switching power supply A (2-7) is the electric cylinder driver. The actuator (2-3) provides voltage; the DC switching power supply B (2-8) provides voltage to the module driver (2-2), motion controller (2-4), analog-to-digital converter (2-5), and weighing transmitter (2-6); the module driver (2-2) drives the module (4-2); the electric cylinder driver (2-3) drives the electric cylinder (3-8); the motion controller (2-4) sends drive signals to the module driver (2-2) and the electric cylinder driver (2-3); the analog-to-digital converter (2-5) converts the analog signal from the weighing transmitter (2-6) into a digital signal; the weighing transmitter (2-6) converts the pressure on the weighing sensor (3-9) into an analog signal. The electric cylinder motion module (3) includes a portal-shaped support reinforcement frame, an electric cylinder (3-8), and a weighing sensor (3-9); the electric cylinder (3-8) passes through the top of the portal-shaped support reinforcement frame and is mounted on the portal-shaped support reinforcement frame via a flange; the weighing sensor (3-9) is mounted on the external thread of the push rod of the electric cylinder (3-8) via a threaded hole and is used to measure the magnitude of the output thrust when the electric cylinder (3-8) is working; the module motion module (4) includes two module pads (4-1), a module (4-2), a stencil mounting plate (4-3), and a stencil (4-4); Two module pads (4-1) are mounted in parallel above the optical breadboard (1-2) with a fixed distance between them; the module (4-2) is mounted above the two module pads (4-1); the engraving plate (4-3) is mounted on the sliding platform of the module (4-2); the engraving plate (4-4) is mounted on the engraving plate (4-3), which has a pattern and pin holes on both sides. During the picking stage, the pattern is picked up by contacting the glue head (6-1) and is attached to the glue head (6-1). The pin holes are used to accurately position the engraving plate (4-4) on the engraving plate (4-3). The scraping module (5) includes a support rod (5-1), an oil cup fixing plate (5-2), and an oil cup (5-3); the bottom end of the support rod (5-1) is installed above the optical bread board (1-2); the oil cup fixing plate (5-2) is installed on the top of the four support rods (5-1) through through holes, and the through hole in the middle of the oil cup fixing plate (5-2) is used to fix the position of the oil cup (5-3); the oil cup (5-3) is fitted into the middle round through hole of the oil cup fixing plate (5-2) and is located above the engraving plate (4-4); The glue head centering module (6) includes a glue head (6-1), a glue head fixing plate (6-2), centering clamp A (6-3), centering clamp B (6-4), and a glue head seat (6-5). The glue head (6-1) is fixed on the glue head fixing plate (6-2) by a mold when the fluid is solidified. During pickup and release, its precise deformation ensures that the pattern transfer has high geometric accuracy on the surface of the workpiece (7-3). The centering clamp A (6-3) is located on the glue head fixing plate (6-5). Below the fixed plate (6-2), the rubber head (6-1) passes through the middle round hole of the centering clamp A (6-3); the stepped surface of the centering clamp B (6-4) is installed on the upper surface of the centering clamp A (6-3), and the middle round hole at the top of the centering clamp B (6-4) is used for the rubber head seat (6-5) to be threaded out; the rubber head seat (6-5) is installed above the rubber head fixing plate (6-2) by self-tapping screws, and the other end is installed below the electric cylinder motion module (3) by threaded connection; The alignment module (7) includes a workpiece mounting platform (7-1), a workpiece centering plate (7-2), a workpiece (7-3), a scribe plate mounting plate (4-3), two alignment rods (7-4), and an electric cylinder centering plate (7-5). The workpiece mounting platform (7-1) is mounted on top of the optical breadboard (1-2) through a specially made threaded through hole on the optical breadboard (1-2). The through hole in the middle of the workpiece centering plate (7-2) is used to determine the position of the workpiece (7-3). After alignment, the workpiece (7-3) is mounted on the workpiece mounting platform (7-1), and the scribe plate mounting plate (4-3) is mounted on the sliding platform of the module (4-2). The electric cylinder centering plate (7-5) is mounted on the lower surface of the front flange of the electric cylinder (3-8), and the pin holes on both sides are used to accurately position the electric cylinder centering plate (7-5) and the electric cylinder (3-8). The host computer is connected to the motion controller (2-4); The method includes the following steps: Step 1: Establish a hyperelastic constitutive model of the rubber head (6-1) material in the simulation software, and simulate the two processes of picking up in the plane and releasing on the curved surface; Step 2: Analyze the displacement trend of the rubber head (6-1) surface in the plane and curved surface during the simulation process, and design the corresponding two-dimensional pattern (4-4a) based on the displacement trend. Step 3: Prepare the designed planar pattern and conduct experiments to obtain experimental data of the three-dimensional pattern (7-3c). Measure the data displacement gradient of the two-dimensional pattern (4-4a) transferred to the three-dimensional pattern (7-3c) during the experiment. Step 4: Based on the obtained displacement gradient, obtain the positional mapping relationship between the plane and the curved surface under the deformation of the rubber head (6-1); Step 5: Calculate the data of the two-dimensional pattern (4-4a) corresponding to the three-dimensional pattern (7-3c) by using the positional mapping relationship between the obtained plane and the curved surface; Step 6: Based on the obtained pattern data, prepare the two-dimensional pattern (4-4a) on the stencil (4-4). Step 7: Place workpiece (7-3) on workpiece mounting table (7-1), and fit the center through hole of workpiece centering plate (7-2) onto workpiece (7-3); Step 8: The mounting plate (4-3) is installed on the sliding platform of the module (4-2), and the two have a certain range of relative movement. Step 9: Adjust the positions of the engraving plate (4-3) and the workpiece centering plate (7-2) so that the two alignment rods (7-4) pass through the two through holes on the electric cylinder centering plate (7-5), the engraving plate (4-3), and the workpiece centering plate (7-2) from top to bottom; Step 10: Fix the stencil mounting plate (4-3) to the sliding platform of the module (4-2), and position the stencil (4-4) on the stencil mounting plate (4-3) with pins; Step 11: Fix the workpiece (7-3) on the workpiece mounting table (7-1), and fix the relative positions of the two. Remove the workpiece centering plate (7-2) and the two alignment rods (7-4). Step 12: Install the rubber head centering module (6) below the electric cylinder motion module (3). At this time, the pattern on the rubber head (6-1), the engraving plate (4-4) and the workpiece (7-3) are aligned with high precision. Step 13: After the module (4-2) moves and moves the pattern on the engraving plate (4-4) to below the oil cup (5-3), the oil cup (5-3) replenishes the pattern with ink, and then the module (4-2) moves and moves the engraving plate (4-4) back to the corresponding position below the glue head (6-1); Step 14: The electric cylinder (3-8) moves, causing the rubber head (6-1) to pick up the pattern on the die (4-4) and return to its original position; Step 15: The movement of module (4-2) causes the pattern on the engraving plate (4-4) to return to the bottom of the oil cup (5-3); Step 16: The electric cylinder (3-8) moves, causing the pattern picked up on the rubber head (6-1) to be released onto the surface of the workpiece (7-3) and then return to its original position.

2. The high-precision curved surface transfer method according to claim 1, characterized in that, The precise deformation of the rubber head (6-1) during the two stages of pickup and release is obtained by conducting material mechanics tests, namely material tensile tests and material compression tests, to obtain experimental data on the deformation of the rubber head (6-1). Then, the obtained experimental data is used to fit an image, and a hyperelastic constitutive model of the rubber head (6-1) is established based on the fitted image. Finally, simulation is performed to obtain the precise deformation required for different patterns, so as to realize the transfer of different patterns from a plane to an irregular curved surface.

3. The high-precision curved surface transfer method according to claim 1, characterized in that, The centering clamps A (6-3) and B (6-4) are precisely positioned by pin holes. The central through holes of the centering clamps A (6-3) and B (6-4) are used to ensure the positional accuracy between the rubber head (6-1) and the rubber head seat (6-5).

4. The high-precision curved surface transfer method according to claim 1, characterized in that, The pattern on the die plate (4-4) is obtained by using a conformal algorithm to obtain the positional mapping relationship between the plane and the curved surface. Then, the corresponding two-dimensional pattern data is calculated by using the three-dimensional pattern data formed after the transfer on the workpiece (7-3). The pattern is then prepared on the die plate (4-4). In this way, the pattern data on the die plate (4-4) can be obtained according to different workpiece (7-3) surfaces and the required transferred pattern, and the pattern can be prepared on the die plate (4-4). The pattern on the die plate (4-4) can be quickly replaced and used through a standard threaded hole.

5. The high-precision curved surface transfer method according to claim 1 is characterized in that, The oil cup (5-3) includes a cup body, a magnet, and a blade ring. The cup body is fitted inside the central through hole of the oil cup fixing plate (5-2). The function of the cup body is to store ink and replenish the ink for the pattern on the engraving plate (4-4) when it moves to the bottom of the oil cup (5-3). The magnet is installed inside the cup body and its function is to attract the oil cup (5-3) to the engraving plate (4-4). The blade ring is installed below the cup body and contacts the engraving plate (4-4). The function of the blade ring is to scrape off the excess ink on the pattern when it moves out of the oil cup (5-3).

6. The high-precision curved surface transfer method according to claim 1, characterized in that, The electric cylinder centering plate (7-5), the engraving plate mounting plate (4-3), and the workpiece centering plate (7-2) each have two through holes at both ends, which form a clearance fit with the two alignment rods (7-4). When the two alignment rods (7-4) pass through the two through holes on the electric cylinder centering plate (7-5), the engraving plate mounting plate (4-3), and the workpiece centering plate (7-2), respectively, that is, when the two through holes on the electric cylinder centering plate (7-5), the engraving plate mounting plate (4-3), and the workpiece centering plate (7-2) coincide in the vertical direction, after the rubber head (6-1) and the engraving plate (4-4) are installed on the electric cylinder (3-8) and the engraving plate mounting plate (4-3), respectively, the pattern on the rubber head (6-1) and the engraving plate (4-4) is aligned with the workpiece (7-3) with high precision.

7. The high-precision curved surface transfer method according to claim 1, characterized in that, The aforementioned support and reinforcement frame includes two support plates (3-1), two lower reinforcement plates (3-2), two left reinforcement plates (3-3), two middle reinforcement plates (3-4), two right reinforcement plates (3-5), four upper reinforcement plates (3-6), and a crossbeam (3-7). The support plates (3-1) and lower reinforcement plates (3-2) are respectively installed above the optical breadboard (1-2) through threaded through holes on the optical breadboard (1-2). The two left reinforcement plates (3-3), two middle reinforcement plates (3-4), and two right reinforcement plates (3-5) are respectively symmetrically installed on the inner side of the two support plates (3-1) to increase the stability of the support plates (3-1). The crossbeam (3-7) is installed above the two support plates (3-1). The four upper reinforcement plates (3-6) are respectively installed at both ends of the lower surface of the crossbeam (3-7) and fixed to the two support plates (3-1) to reinforce the installation of the crossbeam (3-7) and the two support plates (3-1).

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