A laser engraving device and automatic front and back frame integrated laser engraving process

Abstract

This application provides a laser engraving device and an automated integrated laser engraving process for the front and back surfaces of a mid-frame. First, the mid-frame to be laser engraved is positioned and fixed on a positioning fixture, with the mid-frame in an initial position where the TP (top) surface faces upwards. Then, a controlled rotating mechanism rotates the positioning fixture and the mid-frame to different workstations with different predetermined angles. At each workstation where the TP surface faces upwards, a controlled laser engraving process applies laser engraving finishing to the mid-frame. Next, the controlled rotating mechanism rotates the positioning fixture and the mid-frame until the BP (bottom) surface faces upwards, and the controlled laser engraving process applies laser engraving finishing to the outer periphery of the BP surface of the mid-frame. Finally, after the laser engraving finishing is completed, the controlled rotating mechanism rotates the positioning fixture and the mid-frame back to their initial position. The technical solution provided by this application effectively simplifies the laser engraving finishing process for the mid-frame, improves processing accuracy, and thus contributes to increased production capacity and product yield.

Description

Technical Field

[0001] This application belongs to the field of laser engraving technology, and more specifically, it relates to a laser engraving device and an automated integrated laser engraving process for the front and back of the middle frame. Background Technology

[0002] In the production process of mobile phone mid-frames, painting is usually required. However, during the painting process, paint may inevitably be sprayed onto the non-painted areas of the TP (top panel) and BP (bottom panel) of the mid-frame, causing adverse effects, such as, but not limited to, affecting the adhesion of adhesives in subsequent assembly processes and impacting the overall structural performance of the phone. The current industry solution to this problem is to perform laser engraving and paint removal on the mid-frame. However, existing laser engraving and paint removal processes typically use conventional laser engraving equipment. The usual procedure involves fixing a positioning fixture on the laser engraving machine's table, positioning and fixing the mid-frame within the fixture, and then using laser engraving to remove the paint from the TP surface. Then, the mid-frame is removed and placed in another positioning fixture on a different laser engraving machine, where the paint from the BP surface is removed using laser engraving. This laser engraving and splattering process requires two machines and two employees to complete. The laser engraving and removal of splattered oil on the TP and BP surfaces also needs to be done separately in two separate steps. Furthermore, the process of moving the middle frame up and down between two sets of positioning fixtures also wastes a lot of time. As a result, the existing laser engraving and splattering process not only occupies a large production space, but also has low production efficiency and high labor and equipment costs. Summary of the Invention

[0003] The purpose of this application is to provide a laser engraving device to solve the above-mentioned technical problems existing in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a laser engraving device for performing an integrated laser engraving process on a mid-frame, the laser engraving device comprising:

[0005] The machine is equipped with a flat platform, which includes a working area.

[0006] The laser mechanism includes a support column, a first connecting plate, a laser, and a laser lens; the support column is vertically fixed on the platform, the laser is connected to the support column through the first connecting plate, the first connecting plate can slide on the support column in the vertical direction, and the laser lens is provided at the front end of the laser and is located directly above the working area.

[0007] A positioning fixture, used to position and fix the middle frame, is located directly below the laser lens and above the working area; and,

[0008] The rotating mechanism is installed on the support column. One end of the rotating mechanism is connected to the support column and can slide up and down along the support column. The other end of the rotating mechanism is connected to the positioning fixture. The rotating mechanism can controllably drive the positioning fixture and the middle frame to rotate to a predetermined work position and a predetermined angle.

[0009] Optionally, the rotating mechanism includes a second connecting plate, a first rotating drive member, a third connecting plate, and a second rotating drive member; the second connecting member is slidably connected to the support column, the first rotating drive member is mounted on the second connecting plate, the third connecting plate is connected to the first rotating drive member, and the second rotating drive member and the positioning fixture are respectively disposed on both sides of the surface of the third connecting plate; the first rotating drive member is coaxially arranged with the third connecting plate and is controlled to drive the third connecting plate to rotate axially, and the axial direction is parallel to the platform but perpendicular to the support column; the axial direction of the second rotating drive member is perpendicular to the third connecting plate, and the second rotating drive member is controlled to drive the positioning fixture and the middle frame to rotate axially.

[0010] Optionally, the positioning fixture is provided with a positioning protrusion, an internal contour positioning part and a vacuum suction hole for connecting the air pipe. The positioning protrusion is adapted to the positioning hole on the middle frame, the internal contour positioning part is positioned and snapped into the middle frame, and the vacuum suction hole is used to adsorb and fix the middle frame.

[0011] This application also proposes an automated integrated laser engraving process for the front and back surfaces of a middle frame, which is completed using the laser engraving equipment described above. The middle frame has opposing TP and BP surfaces, and also includes an outer perimeter, which includes an outer side wall and several steps located on the inner side of the outer side wall. The automated integrated laser engraving process for the front and back surfaces of the middle frame includes the following steps:

[0012] Position and fix the middle frame to be laser engraved on the positioning fixture, with the middle frame in the initial position with the TP side facing upward;

[0013] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to different work stations with different predetermined angles. At each work station with the TP face facing up, the laser mechanism is controlled to perform laser engraving and splatter oil treatment on the middle frame.

[0014] The rotating mechanism is controlled to rotate the positioning fixture and the middle frame until the BP surface is facing upwards, and the laser mechanism is controlled to perform laser engraving and splatter oil treatment on the outer periphery of the BP surface of the middle frame.

[0015] After the laser engraving and oil treatment is completed, the rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate back to the initial position.

[0016] Optionally, the outer perimeter is formed by sequentially connecting the first short side, the second long side, the third short side, and the fourth long side, with the first short side facing the third short side and the second long side facing the fourth long side. The rotating mechanism, under control, drives the positioning fixture and the middle frame to rotate until the BP surface faces upward. The rotating mechanism, under control, drives the positioning fixture and the middle frame to different workstations with different predetermined angles. At each workstation where the BP surface faces upward, the laser mechanism performs laser engraving and varnishing on the middle frame, including the following sub-steps:

[0017] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the first station. At the first station, the middle frame is tilted relative to the table and the short side of the first face is located at the lower end. The laser mechanism performs laser engraving and splattering on the steps on the short side of the first face.

[0018] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the second station. At the second station, the middle frame is tilted relative to the table and the long side of the second surface is located at the bottom. The laser mechanism performs laser engraving and splattering on the steps on the long side of the second surface.

[0019] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the third station. At the third station, the middle frame is tilted relative to the table and the short side of the third surface is located at the bottom. The laser mechanism performs laser engraving and splattering treatment on the steps on the short side of the third surface.

[0020] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fourth station. At the fourth station, the middle frame is tilted relative to the table and the long side of the fourth face is located at the bottom. The laser mechanism performs laser engraving and splattering treatment on the steps on the long side of the fourth face.

[0021] The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fifth station. At the fifth station, the TP surface of the middle frame faces upward and is parallel to the table. The laser emitted by the laser mechanism runs around the outer perimeter for a full circle, and laser engraving and splattering are performed on the outer perimeter except for the steps.

[0022] Optionally, when the TP face is facing up, in each unidirectional scan of the laser engraving and oiling process, the laser's tool path is from the inner starting end of the step away from the outer wall along the width direction of the outer perimeter until the junction of the step and the outer wall.

[0023] Optionally, the rotating mechanism controls the positioning fixture and the middle frame to rotate until the BP surface faces upward, and the laser mechanism controls the laser engraving and varnishing treatment of the outer periphery of the BP surface of the middle frame, which includes the following sub-steps:

[0024] The rotating mechanism is controlled to rotate the positioning fixture and the middle frame until the BP surface is facing upwards and parallel to the platform.

[0025] The laser mechanism performs laser engraving and varnishing on the corner areas of the outer perimeter of the BP surface.

[0026] Optionally, in laser engraving and splattering, a two-stage cross-filling method is used; the first filling angle is used during the first filling, and the second filling angle is used during the second filling; the first filling angle is an acute angle, and the second filling angle is an obtuse angle.

[0027] Optionally, in laser engraving and varnishing, the laser speed is 3500-5500 mm / s, the frequency is 40-70 kHz, the pulse width is 3-10 microseconds, the focal length is 20-40 cm, and the fill line spacing is 0.04-0.06 mm.

[0028] Optionally, on the TP surface, the width of the outer wall is less than or equal to one-third of the width of the outer perimeter; on the BP surface, the reserved gap between the laser path and the outer wall during laser engraving and oiling is less than or equal to 0.2mm.

[0029] The beneficial effects of the laser engraving equipment and automated integrated laser engraving process for the front and back sides of the middle frame provided in this application are as follows: First, the rotating mechanism is adjusted to a suitable height position, and the laser mechanism is set up as required; then, the middle frame is positioned and fixed on the positioning fixture, and after receiving the control signal, the rotating mechanism controls the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle; then, the laser emitted by the laser mechanism first performs laser engraving and varnishing treatment on the area to be processed on the TP surface of the middle frame; then, the rotating mechanism controls the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle with the BP surface facing upwards, and then controls the laser engraving mechanism to perform laser engraving and varnishing treatment on the area to be processed on the BP surface of the middle frame. In this way, by setting the positioning fixture on the rotating mechanism, the rotating mechanism can controllably drive the positioning fixture and the middle frame to rotate to a predetermined position and angle. The rotating mechanism can also adjust its position by sliding up and down on the support column. This enables automatic laser engraving and smearing treatment of the TP and BP surfaces of the middle frame in the same positioning fixture on a single laser engraving machine. Therefore, compared with the existing method of using two laser engraving machines and two sets of positioning fixtures to complete the laser engraving and smearing treatment of the TP and BP surfaces respectively, this laser engraving equipment has the advantages of requiring fewer equipment and fixtures, lower equipment, labor and material costs, saving floor space, high laser engraving accuracy, and simplified processes, which is conducive to improving production efficiency and product yield. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A front view of the laser engraving equipment provided in the embodiments of this application;

[0032] Figure 2 A side view of the laser engraving equipment provided in an embodiment of this application;

[0033] Figure 3 A top view of the laser engraving equipment provided in the embodiments of this application;

[0034] Figure 4 A process flow diagram of the automated integrated laser engraving process for the front and back sides of the middle frame provided in this application embodiment.

[0035] Explanation of icon numbers:

[0036] label name label name 100 machine 110 Tabletop 120 work area 111 Through hole 200 Laser mechanism 210 pillar 220 First connecting plate 230 laser 240 laser lens 300 monitor 250 Focus adjustment dial Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this application are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0040] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0044] This application provides a laser engraving device.

[0045] Please see Figures 1 to 3 In one embodiment, the laser engraving equipment is used for integrated laser engraving of the middle frame. Specifically, the laser engraving equipment includes a machine base 100, a laser mechanism 200, a positioning fixture, and a rotating mechanism. The machine base 100 has a flat platform 110, which includes a working area 120. The laser mechanism 200 includes a support column 210, a first connecting plate 220, a laser 230, and a laser lens 240. The support column 210 is vertically fixed to the platform 110. The laser 230 is connected to the support column 210 via the first connecting plate 220, which can slide vertically on the support column 210. The laser lens 240 is located at the front end of the laser 230 and is positioned directly above the working area 120. The positioning fixture is used to position and fix the middle frame, and is located directly below the laser lens 240 and above the working area 120. The rotating mechanism is installed on the support column 210. One end of the rotating mechanism is connected to the support column 210 and can slide up and down along the support column 210. The other end of the rotating mechanism is connected to the positioning fixture, and the rotating mechanism can controllably drive the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle.

[0046] Based on this design, in this embodiment, firstly, the rotating mechanism is adjusted to a suitable height position, and the laser mechanism 200 is set as required; then, the middle frame is positioned and fixed on the positioning fixture, and after receiving the control signal, the rotating mechanism controls the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle; then, the laser emitted by the laser mechanism 200 first performs laser engraving and varnishing treatment on the area to be processed on the TP surface of the middle frame; then, the rotating mechanism controls the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle with the BP surface facing upwards, and then controls the laser engraving mechanism to perform laser engraving and varnishing treatment on the area to be processed on the BP surface of the middle frame. In this way, by setting the positioning fixture on the rotating mechanism, the rotating mechanism can controllably drive the positioning fixture and the middle frame to rotate to a predetermined position and angle. The rotating mechanism can also adjust its position by sliding up and down on the support column 210. This enables automatic laser engraving and varnishing of the TP and BP surfaces of the middle frame in the same positioning fixture on a single laser engraving machine. Therefore, compared with the existing method of using two laser engraving machines and two sets of positioning fixtures to complete the laser engraving and varnishing of the TP and BP surfaces respectively, this laser engraving equipment has the advantages of requiring fewer equipment and fixtures, lower equipment, labor and material costs, saving floor space, high laser engraving accuracy, and simplified processes, which is conducive to improving production efficiency and product yield.

[0047] It should be noted that this laser engraving equipment also includes other components, such as, but not limited to, a monitor 300, a keyboard, a mouse, and a focus adjustment dial 250. The monitor 300, used for displaying information, is fixed to the platform 110 and spaced apart from the laser engraving mechanism to facilitate real-time monitoring of the equipment's operation. The keyboard and mouse, used for inputting information, can be stored on a pull-out panel beneath the platform 110 and can be pulled out for use. The focus adjustment dial 250 is located at the top of the support column 210 to facilitate adjustment of the laser's focus.

[0048] Further, specifically in this embodiment, the rotating mechanism includes a second connecting plate, a first rotating drive member, a third connecting plate, and a second rotating drive member; the second connecting member is slidably connected to the support column 210, the first rotating drive member is mounted on the second connecting plate, the third connecting plate is connected to the first rotating drive member, and the second rotating drive member and the positioning fixture are respectively disposed on both sides of the surface of the third connecting plate; the first rotating drive member is coaxially arranged with the third connecting plate and is controlled to drive the third connecting plate to rotate axially, and the axial direction is parallel to the platform 110 but perpendicular to the support column 210; the axial direction of the second rotating drive member is perpendicular to the third connecting plate, and the second rotating drive member is controlled to drive the positioning fixture and the middle frame to rotate axially. In this way, the first rotating drive member can realize the rotation of the third connecting plate in the axial direction, i.e., the Y direction, thereby driving the positioning fixture and the middle frame to be laid flat, tilted, and to realize the flipping of the TP surface and BP surface; and the first rotating drive member can realize the rotation of the positioning fixture and the middle frame on the third connecting plate, thereby realizing automatic workstation switching.

[0049] Furthermore, in this embodiment, the positioning fixture is provided with positioning protrusions, an internal contour positioning part, and a vacuum suction hole for connecting the air pipe. The positioning protrusions are adapted to and connected to the positioning holes on the middle frame, the internal contour positioning part is positioned and snapped into the middle frame, and the vacuum suction hole is used to adsorb and fix the middle frame. Specifically, multiple positioning protrusions are provided and spaced apart, and multiple vacuum suction holes are also provided and spaced apart to improve the uniformity of adsorption. It can be understood that the middle frame fixed by multiple methods such as positioning protrusions, internal contour positioning parts, and vacuum adsorption has high positioning accuracy and fixing stability, which is beneficial to improving the accuracy of subsequent laser engraving and oil spraying. In addition, in this embodiment, the platform 110 is preferably, but not limited to, made of aluminum plate or semi-aluminum plate, and has multiple through holes 111 arranged in an array on the working area 120 to facilitate the fixing of other positioning fixtures and the adsorption and discharge of waste residue in other processes.

[0050] This application also proposes an automated integrated laser engraving process for the front and back surfaces of a mid-frame, which is performed using the laser engraving equipment described above. Here, the mid-frame has opposing TP and BP surfaces, and also includes an outer perimeter, which includes an outer side wall and several steps located inside the outer side wall. Specifically, the automated integrated laser engraving process for the front and back surfaces of the mid-frame includes the following steps:

[0051] S1. Position and fix the middle frame to be laser engraved on the positioning fixture, with the middle frame in the initial position with the TP side facing upward;

[0052] S2. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to different work stations with different predetermined angles. At each different work station with the TP face facing up, the laser mechanism 200 is controlled to perform laser engraving and oiling treatment on the middle frame.

[0053] S3. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate until the BP surface is facing upward. The laser mechanism 200 is controlled to perform laser engraving and splatter oil treatment on the outer periphery of the BP surface of the middle frame.

[0054] S4. After the laser engraving and oil treatment is completed, the rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate back to the initial position.

[0055] Here, the initial position is with the TP side of the middle frame facing upwards and parallel to the platform 110. Simultaneously, the length direction of the middle frame and the positioning fixture is perpendicular to the length direction of the third connecting plate. It can be understood that this rotating and flipping process allows for automatic laser engraving and oiling of the TP and BP sides of the middle frame within the same positioning fixture on a single laser engraving machine, without frequent machine and fixture changes. This offers advantages such as fewer required equipment and fixtures, lower equipment, labor, and material costs, space saving, high laser engraving precision, and simplified processes, thereby improving production efficiency and product yield.

[0056] Specifically, in this embodiment, the outer perimeter is formed by sequentially connecting the first short side, the second long side, the third short side, and the fourth long side, with the first short side facing the third short side and the second long side facing the fourth long side. The rotating mechanism, under control, drives the positioning fixture and the middle frame to rotate until the BP surface faces upwards. The rotating mechanism, under control, drives the positioning fixture and the middle frame to different workstations with different predetermined angles. At each workstation with the BP surface facing upwards, the laser mechanism 200 performs laser engraving and varnishing on the middle frame, including the following sub-steps:

[0057] S21. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the first station. At the first station, the middle frame is tilted relative to the table 110 and the short side of the first surface is located at the lower end. The laser mechanism 200 performs laser engraving and splattering on the steps on the short side of the first surface.

[0058] S22. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the second station. At the second station, the middle frame is tilted relative to the table 110 and the long side of the second surface is located at the lower end. The laser mechanism 200 performs laser engraving and splattering on the steps on the long side of the second surface.

[0059] S23. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the third station. At the third station, the middle frame is tilted relative to the table 110 and the short side of the third surface is located at the lower end. The laser mechanism 200 performs laser engraving and splattering treatment on the steps on the short side of the third surface.

[0060] S24. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fourth station. At the fourth station, the middle frame is tilted relative to the table 110 and the long side of the fourth face is located at the lower end. The laser mechanism 200 performs laser engraving and splattering on the steps on the long side of the fourth face.

[0061] S25. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fifth station. At the fifth station, the TP surface of the middle frame faces upward and is parallel to the table 110. The laser emitted by the laser mechanism 200 runs around the outer perimeter for one revolution, and performs laser engraving and splattering treatment on the outer perimeter except for the steps.

[0062] It should be noted that at the first and third workstations, the length direction of the middle frame is perpendicular to the length direction of the third connecting plate, meaning that both the positioning fixture and the middle frame are in a tilted, vertical position. At the second and fourth workstations, the length direction of the middle frame is consistent with the length direction of the third connecting plate, meaning that both the positioning fixture and the middle frame are in a tilted, horizontal position. As can be seen from the above specific processes, this process of processing the four edges separately and then along the perimeter of the TP surface ensures complete laser engraving and varnish removal of the steps on each edge, and also achieves a clean perimeter after varnish removal, thus further improving product yield.

[0063] Furthermore, specifically in this embodiment, when the TP surface is facing upwards, in each unidirectional scan of the laser engraving and overspray treatment, the laser's path starts from the inner end of the step away from the outer wall, along the width direction of the outer perimeter until the point where the step meets the outer wall. In other words, each laser scan proceeds from the inner side of the step to the outer side, ensuring that the laser engraving and overspray treatment at the step is fully completed, which helps improve product yield.

[0064] Furthermore, specifically in this embodiment, the step of the rotating mechanism controlling the positioning fixture and the middle frame to rotate until the BP surface faces upward, and the laser mechanism 200 controlling the laser engraving and varnishing treatment of the outer periphery of the BP surface of the middle frame includes the following sub-steps:

[0065] S31. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate until the BP surface is facing upwards and the BP surface is parallel to the table 110.

[0066] S32, the laser mechanism 200 performs laser engraving and varnishing on the corner area of ​​the outer periphery of the BP surface.

[0067] It is understandable that after completing the laser engraving and varnishing treatment on the TP side of the middle frame, the rotating mechanism can be directly controlled to rotate the middle frame so that the BP side is facing upwards. Then, the outer peripheral corner areas that need to be treated can be laser engraved and varnished without having to remove the middle frame and transfer it to another positioning fixture on another laser engraving machine to make the BP side of the middle frame face upwards. This rotating and flipping method can simplify the process, improve the degree of automation, and thus help improve production efficiency and product yield.

[0068] It should be specifically noted that in this application, a two-stage cross-filling method is used in the laser engraving spraying process. A first filling angle is used during the first fill, and a second filling angle is used during the second fill; the first filling angle is an acute angle, and the second filling angle is an obtuse angle. Specifically, in this embodiment, the first filling angle during the first fill is 45 degrees, and the second filling angle during the second fill is 135 degrees. It can be understood that this two-stage cross-filling method, compared to ordinary unidirectional or bidirectional filling, can fundamentally solve problems such as uniformity and light leakage, and has advantages such as eliminating grid light leakage, homogenizing surface texture, improving adhesion, and masking mechanical errors. However, this design is not limited to this; in other embodiments, appropriate filling times and filling angles can be set according to the actual needs of different products or models.

[0069] Specifically, in this embodiment, to achieve better processing results in laser engraving and overprinting, the preferred parameters are: laser speed of 3500-5500 mm / s, frequency of 40-70 kHz, pulse width of 3-10 microseconds, focal length of 20-40 cm, and fill line spacing of 0.04-0.06 mm. This ensures better accuracy and completeness in the laser engraving and overprinting process. Of course, in other embodiments, the aforementioned parameters can be set according to the specific requirements of different products or models. Here, to ensure the accuracy of the laser engraving and overprinting process, the corresponding parameter information needs to be specifically fixed before laser engraving. For different products or models, the corresponding optimized parameter information should be entered and checked in advance.

[0070] Furthermore, in this embodiment, on the TP surface, the width of the outer wall is less than or equal to one-third of the outer perimeter width; on the BP surface, the clearance between the laser path and the outer wall during laser engraving and overspray treatment is less than or equal to 0.2mm. It can be understood that the aforementioned optimized width and clearance settings minimize the impact of the laser on non-processed areas during the treatment process, thereby improving product yield. Of course, in other embodiments, the aforementioned parameter optimization settings can be set according to actual conditions for different products or models. Here, the various widths used for laser engraving are based on 2D specifications. In addition, during laser engraving and overspray treatment, special care should be taken to ensure that the laser does not engrave onto the outer surface of the middle frame to avoid defective products.

[0071] In addition, after laser engraving is completed, the mid-frame needs to undergo quality inspection. The inspection content and acceptance standards include, but are not limited to: a visually gray appearance, without blackening or carbonization; no obvious residue of fly oil, but dot-like residue is allowed; and under a 200x microscope, the laser-engraved surface is flat, without obvious unevenness, etc. After passing the inspection, the mid-frame can proceed to the next process.

[0072] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser engraving device for integrated laser engraving process on a middle frame, characterized in that, The laser engraving equipment includes: A machine platform, wherein a flat plate is provided on the machine platform, and the plate includes a working area; A laser mechanism includes a support column, a first connecting plate, a laser, and a laser lens; the support column is vertically fixed on the platform, the laser is connected to the support column through the first connecting plate, the first connecting plate can slide on the support column in the vertical direction, and the laser lens is provided at the front end of the laser, which is located directly above the working area; A positioning fixture is used to position and fix the middle frame, the positioning fixture being located directly below the laser lens and above the working area; and, A rotating mechanism is installed on the support column. One end of the rotating mechanism is connected to the support column and can slide up and down along the support column. The other end of the rotating mechanism is connected to the positioning fixture. The rotating mechanism can controllably drive the positioning fixture and the middle frame to rotate to a predetermined position and a predetermined angle.

2. The laser engraving apparatus of claim 1, wherein, The rotating mechanism includes a second connecting plate, a first rotating drive component, a third connecting plate, and a second rotating drive component; the second connecting component is slidably connected to the support column, the first rotating drive component is mounted on the second connecting plate, the third connecting plate is connected to the first rotating drive component, and the second rotating drive component and the positioning fixture are respectively disposed on both sides of the surface of the third connecting plate; the first rotating drive component is coaxially arranged with the third connecting plate and is controlled to drive the third connecting plate to rotate axially, and the axial direction is parallel to the platform but perpendicular to the support column; the axial direction of the second rotating drive component is perpendicular to the third connecting plate, and the second rotating drive component is controlled to drive the positioning fixture and the middle frame to rotate axially.

3. The laser engraving apparatus of claim 1, wherein, The positioning fixture is provided with a positioning protrusion, an internal contour positioning part and a vacuum suction hole for connecting the air pipe. The positioning protrusion is adapted to and connected to the positioning hole on the middle frame, the internal contour positioning part is positioned and snapped into the middle frame, and the vacuum suction hole is used to adsorb and fix the middle frame.

4. An automatic integrated laser engraving process for front and back surfaces of a middle frame, characterized in that, The laser engraving equipment as described in any one of claims 1 to 3 is used to complete the process. The middle frame has opposing TP and BP surfaces. The middle frame also includes an outer perimeter, which includes an outer side wall and several steps located inside the outer side wall. The automated integrated laser engraving process for the front and back surfaces of the middle frame includes the following steps: The middle frame to be laser-engraved is positioned and fixed on the positioning fixture, with the middle frame located in the initial position where the TP face is facing upward; The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to different work positions with different predetermined angles. At each different work position where the TP face is facing upward, the laser mechanism is controlled to perform laser engraving and splatter oil treatment on the middle frame. The rotating mechanism is controlled to rotate the positioning fixture and the middle frame until the BP surface faces upward, and the laser mechanism is controlled to perform laser engraving and varnishing treatment on the outer periphery of the BP surface of the middle frame; After the laser engraving and oil treatment is completed, the rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate back to the initial position.

5. The automatic front and back frame all-in-one laser engraving process of claim 4, wherein, The outer perimeter is formed by sequentially connecting a first short side, a second long side, a third short side, and a fourth long side, with the first short side facing the third short side and the second long side facing the fourth long side. The rotating mechanism, under control, drives the positioning fixture and the middle frame to rotate until the BP surface faces upwards. The rotating mechanism, under control, drives the positioning fixture and the middle frame to different workstations with different predetermined angles. At each workstation where the BP surface faces upwards, the laser mechanism performs laser engraving and varnishing on the middle frame, including the following sub-steps: The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the first station. At the first station, the middle frame is tilted relative to the table and the short side of the first surface is located at the lower end. The laser mechanism performs laser engraving and splattering treatment on the steps on the short side of the first surface. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the second station. At the second station, the middle frame is tilted relative to the table and the long side of the second surface is located at the lower end. The laser mechanism performs laser engraving and splattering treatment on the step on the long side of the second surface. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the third station. At the third station, the middle frame is tilted relative to the table and the short side of the third surface is located at the lower end. The laser mechanism performs laser engraving and splattering treatment on the steps on the short side of the third surface. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fourth station. At the fourth station, the middle frame is tilted relative to the table and the long side of the fourth face is located at the lower end. The laser mechanism performs laser engraving and splattering treatment on the step on the long side of the fourth face. The rotating mechanism is controlled to drive the positioning fixture and the middle frame to rotate to the fifth station. At the fifth station, the TP surface of the middle frame faces upward and is parallel to the table. The laser emitted by the laser mechanism runs around the outer perimeter for one revolution, and performs the laser engraving and oiling treatment on the other areas of the outer perimeter except for the step.

6. The automatic front and back frame all-in-one laser engraving process of claim 5, wherein, When the TP surface is facing upwards, in each unidirectional scan of the laser engraving and oiling process, the laser's path is from the inner starting point of the step away from the outer wall along the width direction of the outer perimeter until the point where the step meets the outer wall.

7. The automatic front and back surface of middle frame all-in-one laser engraving process of claim 4, wherein, The rotating mechanism is controlled to rotate the positioning fixture and the middle frame until the BP surface faces upward. The laser mechanism is controlled to perform laser engraving and oil spraying on the outer periphery of the BP surface of the middle frame, which includes the following sub-steps: The rotating mechanism is controlled to rotate the positioning fixture and the middle frame until the BP surface faces upward and the BP surface is parallel to the platform. The laser mechanism performs laser engraving and oil coating treatment on the corner area of ​​the outer periphery of the BP surface.

8. The automatic front and back frame all-in-one laser engraving process of claim 7, wherein, In the laser engraving and oil spraying process, a two-stage cross-filling method is used. During the first filling, a first filling angle is used, and during the second filling, a second filling angle is used. The first filling angle is an acute angle, and the second filling angle is an obtuse angle.

9. The automatic front and back integrated laser engraving process of claim 4, wherein, In the laser engraving and oil spraying process, the laser speed is 3500-5500 mm / s, the frequency is 40-70 kHz, the pulse width is 3-10 microseconds, the focal length is 20-40 cm, and the fill line spacing is 0.04-0.06 mm.

10. The automatic front and back integrated laser engraving process of claim 4, wherein, On the TP surface, the width of the outer side wall is less than or equal to one-third of the width of the outer perimeter; on the BP surface, the reserved gap between the laser cutting path in the laser engraving and oiling process and the outer side wall is less than or equal to 0.2mm.

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