Etching process for curved metal parts

Abstract

The present invention discloses a curved metal part etching process, comprising the following steps: S1, pretreatment: cleaning the curved metal part, removing oil, dust and oxide layer impurities on the surface; S2, coating the anti-corrosion layer: selecting any one of photoresist and ink, using the spraying method of printing equipment, and coating the anti-corrosion layer on the surface of the curved metal part to ensure the thickness and uniformity of the anti-corrosion layer. The present invention can not only overcome many shortcomings of traditional processing methods, but also facilitate fast and stable positioning of the curved metal part in the etching process, thereby improving the processing positioning efficiency; at the same time, it is also convenient to adaptively adjust the positioning position according to the curved surface morphology, thereby ensuring the stability of the curved metal part in the subsequent etching positioning, greatly ensuring the etching effect, and also making the limitations in positioning use smaller, expanding the scope of application, and being conducive to meeting the diversified needs of different industries for curved metal parts.

Description

Technical Field

[0001] The invention relates to the technical field of etching processing, and in particular to an etching processing technology for a curved surface metal part. Background Art

[0002] As we all know, in etching processing, the formation of shapes and patterns does not rely on tools, but is achieved through anti-corrosion layers. Before etching, a layer of anti-corrosion layer will be coated on the surface of the metal part. This layer of anti-corrosion layer can be a material such as photoresist and ink. The anti-corrosion layer is covered in the required shape and pattern by means of photolithography, printing, film pasting, etc. When the metal part is placed in the etching solution, the part not covered by the anti-corrosion layer will react with the chemical solution and be etched away. The part protected by the anti-corrosion layer will not be corroded by the chemical solution and will be retained. After the etching is completed, the anti-corrosion layer is removed to obtain a metal part with a specific shape and pattern. For example, if a circular pattern is to be etched on a metal part, a layer of anti-corrosion material will be first covered on the metal surface, and then the anti-corrosion material in the middle circular area will be removed, and then etching will be performed, and finally a metal part with a circular depression or protrusion in the middle will be obtained.

[0003] In addition, during the etching process of curved metal parts, it is usually necessary to position the workpiece. Accurate positioning can ensure that the etched pattern or shape is in the expected position of the metal part to avoid deviation. And positioning helps to perform accurate operations during the processing, such as coating of the anti-corrosion layer, immersion of the etching solution, etc.

[0004] However, the existing technology often causes the position of the curved metal workpiece to be unstable or inaccurate when coating the anti-corrosion layer, which can easily lead to uneven coverage or position shift of the anti-corrosion layer, thus affecting the etching effect. In addition, traditional common positioning methods such as simple fixture fixation or mechanical positioning can usually only position curved workpieces of specific shapes, and cannot adapt to and adjust the positioning position according to different curved surface shapes. They are often unable to fully adapt to the complex curved shapes of curved metal parts, resulting in inaccurate positioning; this not only easily causes deviations in the etching position, affects the accuracy and stability of etching, and makes it difficult to ensure the etching effect, but also makes the positioning application range during etching processing smaller.

[0005] In addition, although the existing curved metal part etching process can overcome many shortcomings of traditional processing methods, the existing curved metal part etching process is complex and inefficient, and it is difficult to meet the increasingly diverse needs of different industries for curved metal parts. To this end, the present invention proposes a curved metal part etching process. Summary of the invention

[0006] Based on the technical problems existing in the background technology, the present invention proposes a curved metal part etching process.

[0007] The invention provides a curved metal part etching process, comprising the following steps:

[0008] S1. Pretreatment: Clean the curved metal parts to remove oil, dust and oxide impurities on the surface;

[0009] S2. Coating an anti-corrosion layer: Select any one of photoresist and ink, use a spraying method of a printing device, and coat the anti-corrosion layer on the surface of the curved metal part to ensure the thickness and uniformity of the anti-corrosion layer;

[0010] S3, etching: placing the curved metal part coated with the anti-corrosion layer into an etching solution; the etching solution contains strong acid and oxidant components and is stirred and mixed, the etching solution temperature and etching time are controlled, and the etching depth is monitored in real time to ensure that the required etching accuracy and shape are achieved;

[0011] S4. Removing the anti-corrosion layer: After etching is completed, a chemical solvent is used to remove the anti-corrosion layer on the surface of the curved metal part without damaging the etched metal surface;

[0012] S5, post-processing: cleaning and drying the etched curved metal parts to remove residual chemicals; finally, the etched metal parts with a concave or convex middle are obtained;

[0013] The curved metal part etching process also includes a positioning mechanism for positioning the curved metal part, the positioning mechanism includes an etching box for storing etching solution, a sealed box is fixedly installed on the bottom inner wall of the etching box, a vertically arranged electric telescopic cylinder is sealed and rotatably installed in the sealed box through a rotating mechanism, the output end of the electric telescopic cylinder is fixedly connected to a first positioning link, and the two ends of the first positioning link are respectively rotatably connected to a second positioning link in sequence through an adjusting mechanism; and push rod motors are fixedly installed on the tops of the first positioning link and the second positioning link, and the output end of the push rod motor is fixedly connected to a positioning suction head for vacuum negative pressure positioning of the bottom side of the curved metal part; negative pressure pumps are fixedly installed on the inner walls of both sides of the sealed box, and the suction ends of the negative pressure pumps are respectively connected to each positioning suction head through flexible suction pipes;

[0014] The adjustment mechanism includes a stepper motor fixedly mounted on one end of the first positioning link, and the output shaft of the stepper motor is fixedly connected to the second positioning link; the adjustment mechanism between the first positioning link and the second positioning link is the same as the adjustment mechanism between two adjacent second positioning links.

[0015] As a further feature of the present invention, in the pretreatment step of S1, acid pickling and alkaline washing methods are used in combination with ultrasonic cleaning; subsequently, surface activation treatment is performed, using plasma treatment and chemical immersion to enhance the reactivity of the metal surface with the etching solution, so as to remove oil stains, dust and oxide layer impurities on the surface of curved metal parts; and the pretreatment cleaning is performed for 5-10 minutes and ultrasonic treatment is performed for 10-15 minutes, and the surface activation treatment is performed for 5-8 minutes.

[0016] As a further feature of the present invention, in the etching step of S3, the anti-corrosion layer coated on the curved metal part is etched in an etching solution at a temperature of 30-40° C. for 10-15 minutes.

[0017] As a further feature of the present invention, in the post-processing step S5, the surface of the curved metal part is subjected to a surface passivation treatment or a protective film coating treatment to improve the corrosion resistance and appearance of the curved metal part after etching.

[0018] As a further feature of the present invention, the rotating mechanism includes a rotating shaft rotatably installed in a sealed box, the top of the rotating shaft is fixedly connected to the bottom end of the electric telescopic cylinder; a telescopic motor is fixedly installed on the right inner wall of the sealed box, the output end of the telescopic motor is fixedly connected to a spur rack, a gear is fixedly sleeved on the rotating shaft, and the spur rack is meshed with the gear transmission.

[0019] As a further feature of the present invention, a mounting hole is provided on the top inner wall of the sealing box, a sealing bearing is provided in the mounting hole, and the electric telescopic cylinder is sealed and rotatably installed on the sealing bearing; a bearing seat is provided on the bottom inner wall of the sealing box, and the bottom end of the rotating shaft is rotatably installed on the bearing seat; the positioning suction head is specifically made of rubber material.

[0020] As a further feature of the present invention, a controller is also provided on the right side of the etching box, and the controller is electrically controlled and connected with the electric telescopic cylinder, telescopic motor, stepper motor, and push rod motor respectively; the electric telescopic cylinder, telescopic motor, stepper motor, and push rod motor also adopt a sealed and waterproof structure.

[0021] As a further feature of the present invention, the first positioning link and the second positioning link, as well as the combination of two adjacent second positioning links, form a multi-axis linkage positioning system, and the etching angle and posture of the curved metal part are adjusted through the coordinated movement of multiple axes.

[0022] The beneficial effects of the present invention are:

[0023] 1. The curved metal parts etching process can achieve good results in the application of different materials; this not only overcomes many shortcomings of traditional processing methods and improves the scope of application; at the same time, the etching process of curved metal parts is simple, which improves the processing efficiency and is conducive to meeting the increasingly diversified needs of different materials for curved metal parts.

[0024] 2. The etching process for curved metal parts can also perform negative pressure vacuum adsorption positioning on the bottom side of the curved metal parts through the cooperation of a negative pressure pump, a flexible suction pipe, and a positioning suction head; this vacuum adsorption positioning method can evenly apply adsorption force to adapt to curved surfaces of different shapes, and can provide a stable fixing effect, and has a simple structure, which is convenient for fast and stable positioning of curved metal parts during the etching process, thereby improving the processing positioning efficiency.

[0025] 3. The etching process of the curved metal part is also provided with an adjustment mechanism and a rotation mechanism, so that the positioning position can be adjusted according to the actual curved surface requirements of the curved metal part during positioning, so as to ensure the subsequent accurate positioning of the curved metal part; and the first positioning link and the second positioning link, as well as the two adjacent first positioning links, constitute a multi-axis linkage positioning system as a whole, and through the coordinated movement of multiple axes, it is used to adjust the etching angle and posture of the curved metal part to achieve the best etching angle and position, thereby achieving the best positioning effect. In this way, by stably positioning the curved metal part, it is possible to avoid the situation where the etching position deviation caused by unstable positioning affects the etching accuracy and stability, thereby greatly ensuring the etching effect.

[0026] To sum up, the curved metal part etching processing technology provided by the present invention can achieve good results in the application of different materials. It not only overcomes many shortcomings of traditional processing methods and improves the scope of application; it is also convenient for the rapid and stable positioning of the curved metal parts during the etching process, thereby improving the processing positioning efficiency; at the same time, it is also convenient for adaptive adjustment of the positioning position according to the curved surface shape, thereby ensuring the stability of the curved metal parts in subsequent etching positioning, greatly ensuring the etching effect, and also making the limitations in positioning use smaller, thereby expanding the scope of application, which is conducive to meeting the diversified needs of different industries for curved metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of positioning during etching of curved metal parts according to the present invention;

[0028] Figure 2 For the present invention Figure 1 The structural diagram of the enlarged part A in the middle;

[0029] Figure 3It is a schematic diagram of a part of the positioning mechanism of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure among the telescopic motor, spur rack, gear and rotating shaft of the present invention.

[0031] In the figure: 1. etching box; 2. sealing box; 3. telescopic motor; 4. spur rack; 5. gear; 6. rotating shaft; 7. electric telescopic cylinder; 8. first positioning connecting rod; 9. second positioning connecting rod; 10. stepping motor; 11. push rod motor; 12. positioning suction head; 121. flexible suction tube; 122. negative pressure pump; 13. controller; 14. sealed bearing. DETAILED DESCRIPTION

[0032] The present invention will be further explained below in conjunction with specific embodiments. Example

[0033] refer to Figure 1-4 In this embodiment, a curved metal part etching process is proposed, comprising the following steps:

[0034] S1. Pretreatment: Clean the curved metal parts to remove oil, dust and oxide impurities on the surface;

[0035] S2. Coating an anti-corrosion layer: Select any one of photoresist and ink, use a spraying method of a printing device, and coat the anti-corrosion layer on the surface of the curved metal part to ensure the thickness and uniformity of the anti-corrosion layer;

[0036] S3, etching: placing the curved metal part coated with the anti-corrosion layer into an etching solution; the etching solution contains strong acid and oxidant components and is stirred and mixed, the etching solution temperature and etching time are controlled, and the etching depth is monitored in real time to ensure that the required etching accuracy and shape are achieved;

[0037] S4. Removing the anti-corrosion layer: After etching is completed, a chemical solvent is used to remove the anti-corrosion layer on the surface of the curved metal part without damaging the etched metal surface;

[0038] S5, post-processing: cleaning and drying the etched curved metal parts to remove residual chemicals; finally, the etched metal parts with a concave or convex middle are obtained;

[0039] Among them, in the pretreatment step of S1, acid pickling and alkaline washing methods are used, combined with ultrasonic cleaning; then surface activation treatment is carried out, using plasma treatment and chemical immersion to enhance the reactivity of the metal surface with the etching solution, which is used to remove oil, dust and oxide layer impurities on the surface of curved metal parts; and the pretreatment cleaning is 5-10 minutes and ultrasonic treatment is used for 10-15 minutes, and the surface activation treatment is 5-8 minutes.

[0040] In the etching step of S3, the anti-corrosion layer coated on the curved metal part is etched in an etching solution at a temperature of 30-40° C. for 10-15 minutes.

[0041] In the post-processing step of S5, the surface of the curved metal part is subjected to a surface passivation treatment or a protective film coating treatment to improve the corrosion resistance and appearance of the curved metal part after etching.

[0042] Based on the above implementation, two further embodiments are implemented as follows: Example

[0043] Taking stainless steel curved metal parts as an example, pretreatment is first performed, using alkaline solution cleaning and ultrasonic treatment for 15 minutes, and then plasma activation treatment for 5 minutes. Photoresist is used to form an anti-corrosion layer by spin coating, and then etched for 10 minutes in an etching solution at a temperature of 40°C. The etching solution is a mixture of hydrochloric acid, nitric acid and hydrogen peroxide. After etching, the anti-corrosion layer is removed with an organic solvent, and finally cleaning and passivation treatment are performed. Example

[0044] For copper curved metal parts, the pretreatment is pickling for 10 minutes and ultrasonic treatment for 10 minutes, and the surface activation treatment is chemical immersion for 8 minutes. The anti-corrosion layer is formed by spraying with special ink, and etched in an etching solution at 35°C for 15 minutes. The etching solution is ferric chloride solution. After etching, the anti-corrosion layer is removed with an alkaline solution, cleaned and plated.

[0045] Through the above embodiments, it can be seen that the curved metal part etching process provided by the present invention can achieve good results in the application of different materials. This not only overcomes many shortcomings of traditional processing methods, but also uses a wider range of etching materials, which increases the scope of application; at the same time, the process of etching curved metal parts is simple, which improves the processing efficiency and is conducive to meeting the increasingly diverse needs of different materials for curved metal parts.

[0046] See also Figure 1-4As a further improvement, it is also convenient to quickly and stably position the curved metal parts during the etching process, thereby improving the processing positioning efficiency. The curved metal part etching process also includes a positioning mechanism for positioning the curved metal parts, the positioning mechanism includes an etching box 1 for storing etching solution, a sealed box 2 is fixedly installed on the bottom inner wall of the etching box 1, a vertically arranged electric telescopic cylinder 7 is installed in the sealed box 2 through a rotating mechanism for sealing and rotation, the output end of the electric telescopic cylinder 7 is fixedly connected to a first positioning link 8, and the two ends of the first positioning link 8 are also respectively connected to the second positioning link 9 in sequence through an adjusting mechanism; and a push rod motor 11 is fixedly installed on the top of the first positioning link 8 and the second positioning link 9, and the output end of the push rod motor 11 is fixedly connected to a positioning suction head 12 for vacuum negative pressure positioning of the bottom side of the curved metal part; negative pressure pumps 122 are fixedly installed on the inner walls on both sides of the sealed box 2, and the suction ends of the negative pressure pumps 122 are respectively connected to each positioning suction head 12 through flexible suction pipes 121;

[0047] The adjustment mechanism includes a stepper motor 10 fixedly mounted on one end of the first positioning link 8, and the output shaft of the stepper motor 10 is fixedly connected to the second positioning link 9; the adjustment mechanism between the first positioning link 8 and the second positioning link 9 is the same as the adjustment mechanism between two adjacent second positioning links 9.

[0048] The rotating mechanism includes a rotating shaft 6 rotatably installed in the sealed box 2, the top of the rotating shaft 6 is fixedly connected to the bottom end of the electric telescopic cylinder 7; a telescopic motor 3 is fixedly installed on the right inner wall of the sealed box 2, the output end of the telescopic motor 3 is fixedly connected to a spur rack 4, a gear 5 is fixedly sleeved on the rotating shaft 6, and the spur rack 4 is in transmission meshing with the gear 5.

[0049] Among them, a mounting hole is provided on the top inner wall of the sealed box 2, a sealed bearing 14 is provided in the mounting hole, and the electric telescopic cylinder 7 is sealed and rotatably installed on the sealed bearing 14; a bearing seat is provided on the bottom inner wall of the sealed box 2, and the bottom end of the rotating shaft 6 is rotatably installed on the bearing seat; the positioning suction head 12 is specifically made of rubber material; a controller 13 is also provided on the right side of the sealed box 2, and the controller 13 is electrically controlled and connected with the electric telescopic cylinder 7, the telescopic motor 3, the stepper motor 10, and the push rod motor 11 respectively; the electric telescopic cylinder 7, the telescopic motor 3, the stepper motor 10, and the push rod motor 11 also adopt a sealed and waterproof structure.

[0050] The first positioning link 8 and the second positioning link 9, as well as the combination of two adjacent second positioning links 9, form a multi-axis linkage positioning system, and the etching angle and posture of the curved metal part are adjusted through the coordinated movement of multiple axes.

[0051] During the etching process, it is convenient to position the curved metal parts to ensure the stability of the curved metal parts in the subsequent etching process, that is, when the etching positioning is used: the curved metal parts to be etched are placed on the positioning suction head 12 at the top of the first positioning link 8 and the second positioning link 9 along the arc-shaped curved surface; then the positioning suction head 12 is negatively adsorbed by the negative pressure pump 122 and the flexible suction pipe 121, and then the positioning suction head 12 is used to perform negative pressure vacuum adsorption positioning on the bottom side of the curved metal parts. In this way, the negative pressure generated by the negative pressure pump 122 can quickly adsorb the curved metal parts on the positioning suction heads 12 at the top of the first positioning link 8 and the second positioning link 9; and this vacuum adsorption positioning method can evenly apply adsorption force to adapt to curved surfaces of different shapes, and can provide a stable fixing effect. Finally, when etching, the curved metal parts coated with the anti-corrosion layer can be placed in the etching solution, that is, the output end of the electric telescopic cylinder 7 is contracted to drive the curved metal parts positioned by the positioning suction head 12 to be immersed in the etching solution in the etching box 1.

[0052] In addition, by setting an adjustment mechanism and a rotating mechanism, the positioning position can be adjusted according to the actual curved surface requirements of the curved metal part during positioning, that is, during adjustment: the angle position of the curved arc between the first positioning link 8 and the second positioning link 9 can be rotated and adjusted by using the forward and reverse rotation of the output shaft of the stepper motor 10, and the height position of the positioning suction head 12 can be further fine-tuned by the extension and retraction of the push rod motor 11, so that the positioning suction head 12 fits with the bottom side of the curved metal part to ensure the subsequent accurate positioning of the curved metal part; and the first positioning link 8 and the second positioning link 9, as well as the two adjacent first positioning links 8, constitute a multi-axis linkage positioning system as a whole, and the coordinated movement of multiple axes is used to adjust the etching angle and posture of the curved metal part to achieve the best etching angle and position, thereby achieving the best positioning effect; finally, the curved metal part can be stably positioned, which can avoid the etching position deviation caused by inaccurate and unstable positioning, thereby affecting the etching accuracy and stability, and greatly ensuring the etching effect.

[0053] To sum up, the curved metal part etching processing technology provided by the present invention can not only overcome the many shortcomings of traditional processing methods, but also facilitate the rapid and stable positioning of the curved metal parts during the etching process, thereby improving the processing positioning efficiency; at the same time, it is also convenient to adaptively adjust the positioning position according to the curved surface shape, thereby ensuring the stability of the curved metal parts in subsequent etching positioning, making the limitations of positioning use smaller, expanding the scope of application, and helping to meet the diverse needs of different industries for curved metal parts.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A curved metal part etching process, characterized in that: The following steps are involved: S1. Pretreatment: Clean the curved metal parts to remove oil, dust and oxide impurities on the surface; S2. Coating an anti-corrosion layer: Select any one of photoresist and ink, use a spraying method of a printing device, and coat the anti-corrosion layer on the surface of the curved metal part to ensure the thickness and uniformity of the anti-corrosion layer; S3, etching: placing the curved metal part coated with the anti-corrosion layer into the etching solution; The etching solution contains strong acid and oxidant components and is stirred and mixed, the etching solution temperature and etching time are controlled, and the etching depth is monitored in real time to ensure that the desired etching accuracy and shape are achieved; S4. Removing the anti-corrosion layer: After etching is completed, a chemical solvent is used to remove the anti-corrosion layer on the surface of the curved metal part without damaging the etched metal surface; S5, post-processing: cleaning and drying the etched curved metal parts to remove residual chemicals; finally, the etched metal parts with a concave or convex middle are obtained; The curved metal piece etching process also includes a positioning mechanism for positioning the curved metal piece, the positioning mechanism including an etching box (1) for storing etching solution, a sealing box (2) fixedly mounted on the bottom inner wall of the etching box (1), a vertically arranged electric telescopic cylinder (7) sealed and rotatably mounted in the sealing box (2) through a rotating mechanism, the output end of the electric telescopic cylinder (7) fixedly connected to a first positioning connecting rod (8), and the two ends of the first positioning connecting rod (8) are also respectively rotatably connected to second positioning connecting rods (9) through an adjusting mechanism; push rod motors (11) are fixedly mounted on the tops of the first positioning connecting rod (8) and the second positioning connecting rod (9), and the output ends of the push rod motors (11) are fixedly connected to positioning suction heads (12) for performing vacuum negative pressure positioning on the bottom side of the curved metal piece; negative pressure pumps (122) are fixedly mounted on the inner walls of both sides of the sealing box (2), and the suction ends of the negative pressure pumps (122) are respectively connected to the positioning suction heads (12) through flexible suction pipes (121); The adjustment mechanism comprises a stepper motor (10) fixedly mounted on one end of the first positioning link (8), and the output shaft of the stepper motor (10) is fixedly connected to the second positioning link (9); the adjustment mechanism between the first positioning link (8) and the second positioning link (9) is the same as the adjustment mechanism between two adjacent second positioning links (9).

2. The etching process for curved metal parts according to claim 1, characterized in that: In the pretreatment step of S1, acid washing and alkali washing are used in combination with ultrasonic cleaning; Subsequently, surface activation treatment is carried out, using plasma treatment and chemical immersion to enhance the reactivity of the metal surface with the etching solution to remove oil, dust and oxide layer impurities on the surface of curved metal parts; and the pretreatment cleaning is 5-10 minutes and ultrasonic treatment is used for 10-15 minutes, and the surface activation treatment is 5-8 minutes.

3. The etching process for curved metal parts according to claim 1, characterized in that: In the etching step of S3, the anti-corrosion layer coated on the curved metal part is etched in an etching solution at a temperature of 30-40° C. for 10-15 minutes.

4. The etching process for curved metal parts according to claim 1, characterized in that: In the post-processing step S5, the surface of the curved metal part is subjected to a surface passivation treatment or a protective film coating treatment to improve the corrosion resistance and appearance of the curved metal part after etching.

5. The etching process for curved metal parts according to claim 1, characterized in that: The rotating mechanism comprises a rotating shaft (6) rotatably mounted in a sealed box (2), the top end of the rotating shaft (6) being fixedly connected to the bottom end of an electric telescopic cylinder (7); a telescopic motor (3) being fixedly mounted on the right inner wall of the sealed box (2), the output end of the telescopic motor (3) being fixedly connected to a spur rack (4), a gear (5) being fixedly sleeved on the rotating shaft (6), and the spur rack (4) being in transmission meshing engagement with the gear (5).

6. The etching process for curved metal parts according to claim 5, characterized in that: A mounting hole is provided on the top inner wall of the sealing box (2), a sealing bearing (14) is provided in the mounting hole, and the electric telescopic cylinder (7) is mounted on the sealing bearing (14) in a sealed and rotatable manner.

7. The etching process for curved metal parts according to claim 5, characterized in that: A bearing seat is provided on the inner wall of the bottom of the sealing box (2), and the bottom end of the rotating shaft (6) is rotatably mounted on the bearing seat; the positioning suction head (12) is specifically made of rubber material.

8. The curved metal part etching process according to claim 1, characterized in that: A controller (13) is also provided on the right side of the etching box (1), and the controller (13) is electrically controlled and connected to the electric telescopic cylinder (7), the telescopic motor (3), the stepper motor (10), and the push rod motor (11) respectively; the electric telescopic cylinder (7), the telescopic motor (3), the stepper motor (10), and the push rod motor (11) also all adopt a sealed and waterproof structure.

9. The curved metal part etching process according to claim 1, characterized in that: The first positioning link (8) and the second positioning link (9), as well as two adjacent second positioning links (9), are combined to form a multi-axis linkage positioning system, and the etching angle and posture of the curved metal part are adjusted through the coordinated movement of multiple axes.

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