Porous shielding cover forming process method

Abstract

The present invention relates to a porous shielding cover forming process method, which includes the following steps: S1, punching out contour positioning holes, convex bulges and shaping holes for positioning the outer peripheral contour of the porous shielding cover on a sheet material; the contour positioning holes define a middle area and an ear forming area on the sheet material; the convex bulges and shaping holes are located in the middle area; S2, punching out shaping grooves of side inverted structures on the edge of the middle area; S3, performing multiple stamping operations simultaneously in the middle area and the ear forming area to form a middle porous structure and a fixed position structure; S4, performing multiple stamping and folding operations on the edge of the middle area to form a side inverted structure. The porous shielding cover forming process method of the present invention abandons the etching process and mainly adopts the stamping process, which greatly reduces the production cost; and, the punching and folding operations are performed simultaneously, so that the middle porous structure and the fixed position structures on both sides can be formed simultaneously, which greatly shortens the processing cycle of the porous shielding cover.

Description

Technical Field

[0001] The present invention relates to the technical field of communication equipment, and in particular to a method for forming a porous shielding cover. Background Art

[0002] In order to achieve signal shielding, some communication equipment (such as servers) need to be customized and assembled with large-sized and high-precision porous shielding covers (such as Figure 1-3 The conventional manufacturing process for porous shields currently involves first etching the overall outer frame and the porous structure within the shield. A multi-station stamping process is then used to fold and shape the edges of the shield multiple times at different stations to form the shield's fixed structure and side undercuts. This conventional manufacturing process for porous shields, due to the use of an etching-multi-station stamping process, suffers from complex processes, long processing cycles, and high costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved method for forming a porous shielding cover.

[0004] The technical solution adopted by the present invention to solve the technical problem is to provide a porous shielding cover forming process method, which includes the following steps:

[0005] S1. Punching a contour positioning hole for positioning the outer peripheral contour of the porous shielding cover, a convex bulge, and a shaping hole for forming a fixing structure of the porous shielding cover on a sheet material; the contour positioning hole defines a middle area on the sheet material; the convex bulge and the shaping hole are located in the middle area; and the contour positioning hole further defines an ear forming area for forming a fixing structure at the location of the convex bulge and the shaping hole;

[0006] S2. Stamping a shaping groove on the edge of the middle region to form a side undercut structure of the porous shielding cover;

[0007] S3, performing multiple stamping operations simultaneously in the middle area and the ear forming area to form a middle porous structure of the porous shielding cover and fixed position structures on both sides of the porous shielding cover;

[0008] S4. Punch and fold the edges of the middle area multiple times to form a side inverted structure of the porous shielding cover.

[0009] Preferably, the contour positioning holes are strip-shaped and include transverse positioning holes and vertical positioning holes; the vertical positioning holes and transverse positioning holes define the middle area;

[0010] Step S1 includes:

[0011] S1.1. Punching out two opposite vertical positioning holes, and the convex bulge and the shaping hole between the two vertical positioning holes on the sheet material;

[0012] S1.2. According to the positions of the vertical positioning holes, convex hulls and shaping holes, the transverse positioning holes are positioned and punched out on the sheet material.

[0013] Preferably, in step S1.1, the method further comprises: punching out four guide holes for auxiliary positioning at four corners of the sheet material; the guide holes are located outside the middle area.

[0014] Preferably, in step S3, the sheet material is stamped five times successively;

[0015] Among them, after three punching operations, the middle porous structure of the porous shielding cover is formed on the sheet material; after four punching operations, the ears of the fixed position structure of the porous shielding cover are formed in the ear forming area; and after the fifth punching operation, the folded edges of the ears of the fixed position structure are flattened.

[0016] Preferably, in step S3, at least two punching operations also simultaneously flatten the edges of the middle area inward to form anti-scratch folded edges.

[0017] Preferably, step S4 includes:

[0018] S4.1. Punching the edge of the middle region to complete the primary folding of the side undercut structure of the porous shielding cover;

[0019] S4.2. Punching at the four corners of the middle area;

[0020] S4.3. Punch again at the edge of the middle area to complete the secondary folding of the side undercut structure of the porous shielding cover.

[0021] Preferably, in step S4.1, one-time stamping is performed at four edge positions of the middle area to complete one-time folding forming of the side undercut structure of the porous shielding cover.

[0022] Preferably, the secondary folding of the side undercut structure of the porous shielding cover is completed by two stamping steps, and step S4.3 includes:

[0023] S4.3.1. Perform a first punching operation at two opposite edge positions of the middle region to complete the secondary folding of the undercut structures on two side edges of the porous shielding cover.

[0024] S4.3.2. Perform a second stamping operation at the other two opposite edge positions of the middle region to complete the secondary folding of the other two side undercut structures of the porous shielding cover.

[0025] Preferably, the contour positioning hole is strip-shaped, including a transverse positioning hole and a vertical positioning hole; the vertical positioning hole and the transverse positioning hole define the middle area; the molding groove includes a transverse molding groove and a vertical molding groove;

[0026] Step S2 includes: punching out a transverse shaping groove on both side edges of the middle region parallel to the vertical positioning hole; and punching out a vertical shaping groove on both side edges of the middle region parallel to the transverse positioning hole.

[0027] Preferably, the porous shielding cover forming process further comprises step S5: punching out the four corners of the middle area so that the porous shielding cover is removed from the sheet material along its outer periphery.

[0028] The implementation of the present invention has the following beneficial effects: the porous shielding cover forming process method of the present invention abandons the etching process and mainly adopts the stamping process, which greatly reduces the production cost; and, the punching and folding are carried out simultaneously, and the middle porous structure and the fixed position structures on both sides can be formed simultaneously, which greatly shortens the processing cycle of the porous shielding cover and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 It is a schematic diagram of the structure of a porous shield at one viewing angle;

[0031] Figure 2 yes Figure 1 A schematic structural diagram of the porous shield shown in another perspective;

[0032] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0033] Figure 4 It is a partial schematic diagram of a material strip diagram of a method for forming a porous shielding cover according to an embodiment of the present invention;

[0034] Figure 5 It is a partial schematic diagram of a material strip diagram of a method for forming a porous shielding cover according to an embodiment of the present invention;

[0035] Figure 6 yes Figure 5 A magnified schematic diagram of part B;

[0036] Figure 7 yes Figure 5 A magnified schematic diagram of part C;

[0037] Figure 8It is a partial schematic diagram of a material strip diagram of a method for forming a porous shielding cover according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] like Figure 1-3 As shown, the porous shielding cover is roughly frame-shaped and includes a central porous structure 1, fixed structures 2 on either side, and side inverted structures 3 on the four edges. The fixed structure 2 includes ears 20 with multiple folds, a convex bump 22 on the ears 20, and a shaped hole 21. The shaped hole 21 is circular and located near the convex bump 22. The side inverted structures 3 are distributed around the periphery of the porous shielding cover, or on the four edges of the porous shielding cover, forming a V-shaped fold by folding the edges twice.

[0039] As mentioned in the background, the conventional manufacturing process for porous shielding covers is as follows: first, an etching process is used to form the overall outer frame contour and the intermediate porous structure 1 of the porous shielding cover. Then, a multi-station stamping process is used to fold and shape the periphery of the porous shielding cover multiple times at different stations to complete the formation of the fixed position structure 2 and the side undercut structure 3. That is, in the conventional manufacturing process for porous shielding covers, due to the use of an etching-multi-station stamping process, the intermediate porous structure 1 and the outer frame contour structure are completed by the etching process; the fixed position structure 2 and the side undercut structure 3 are completed by a multi-station process by folding the edges multiple times at different locations.

[0040] The defects of this existing process are: the etching process has a high production cost; the etching process itself is time-consuming, especially the etching of the middle porous structure 1 of the shielding cover, which requires a long processing cycle. The production of samples and mass production require a long processing cycle, low production efficiency, and low finished product yield.

[0041] The key difference from the existing etching-multi-station stamping process is that the porous shielding cover forming process method of the present invention abandons the etching process and mainly adopts the stamping process, which greatly reduces the production cost; and, the punching and folding are carried out simultaneously, and the middle porous structure 1 and the fixed position structure 2 on both sides can be formed simultaneously, which greatly shortens the processing cycle and delivery cycle of the porous shielding cover.

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0043] In the following description, it should be noted that the terms "horizontal" and "vertical" are relative concepts defined for ease of understanding and can be understood by referring to the orientations and reference numerals in the accompanying drawings and the specific embodiments provided below. However, if the placement of the object being explained changes, the meanings of "horizontal" and "vertical" may or may not change accordingly. However, these interpretations are made for ease of understanding and should not be construed as limiting the scope of protection of this technical solution.

[0044] Please also read Figure 4 The material strip diagram (or layout diagram or process diagram) shown shows the process and process steps of the porous shielding cover forming process method according to an embodiment of the present invention. Figure 4 、 Figure 5 、 Figure 8 From left to right, a complete strip diagram can be formed. In each diagram, multiple stamping stations are shown from left to right. Figure 4 The rightmost position is a transition area (shown in the figure), which only represents the plane figure presented after step S1 and does not belong to a stamping station. In the mass production stage, the stamping die can be a set of continuous dies, that is, a set of dies with several different stations to complete multiple stamping processes simultaneously. After each stamping cycle, the material strip moves a fixed distance, so that multiple porous shielding covers can be continuously formed on a single strip, or until the strip is stripped.

[0045] A method for forming a porous shielding cover according to an embodiment of the present invention includes the following steps:

[0046] S1. Punch out the outline positioning hole 5, the convex bulge 22 and the shaping hole 21 on the sheet material 10. The outline positioning hole 5 is used to locate the outer peripheral contour of the porous shielding cover. The convex bulge 22 and the shaping hole 21 are used to form the fixing structure 2 of the porous shielding cover.

[0047] The plate 10 may be made of stainless steel or other materials.

[0048] The contour positioning hole 5 defines a middle area 6 on the sheet material 10. The convex bulge 22 and the shaping hole 21 are located in the middle area 6. The contour positioning hole 5 also defines an ear forming area 7 for forming the fixing structure 2 at the location of the convex bulge 22 and the shaping hole 21.

[0049] Because the convex bump 22, the molded hole 21, and the ear portion 20 with multiple folded edges together form the fixed position structure 2 of the porous shield, the positions of the convex bump 22, the molded hole 21, and the ear portion forming area 7 of the fixed position structure 2 correspond to each other. Therefore, in terms of process sequence, the planar position of the convex bump 22 and the molded hole 21 can be determined first, and then the planar position of the ear portion forming area 7; alternatively, the planar position of the ear portion forming area 7 can be determined first, and then the planar position of the convex bump 22 and the molded hole 21 can be determined.

[0050] After determining the relative positions of the bulge 22, the shaping hole 21, and the ear 20 on the plane, the ear forming area 7 is stamped and folded multiple times to obtain the ear 20 with multiple folds, and also to obtain the fixed position structure 2 with the ear 20, the bulge 22 and the shaping hole 21.

[0051] Furthermore, in this embodiment, the contour positioning holes 5 are strip-shaped and include transverse positioning holes 51 and vertical positioning holes 50, and the transverse positioning holes 51 and the vertical positioning holes 50 define a middle area 6. The transverse positioning holes 51 and the vertical positioning holes 50 are perpendicular to each other.

[0052] Specifically, two vertical positioning holes 50 are positioned opposite each other, and two transverse positioning holes 51 are positioned opposite each other, thereby enclosing a central region 6. The transverse positioning holes 51 are bent a certain height in the middle of their length, forming an arched bridge. This arched bridge portion is formed in each of the transverse positioning holes 51 on opposite sides. This arched bridge portion defines the ear forming region 7 on the sheet material 10.

[0053] In this embodiment, to facilitate positioning, it is preferred to first determine the planar position of the convex bulge 22 and the molding hole 21, and then determine the planar position of the ear molding area 7. It is understood that in other embodiments, the planar position of the ear molding area 7 may also be determined first, and then the planar position of the convex bulge 22 and the molding hole 21 may be determined.

[0054] like Figure 4 As shown, step S1 includes:

[0055] S1.1. Punch out two opposite vertical positioning holes 50 , and a convex bulge 22 and a shaping hole 21 between the two vertical positioning holes 50 on the sheet material 10 .

[0056] Preferably, four guide holes 8 for auxiliary positioning can be punched out at the four corners of the sheet material 10. The four guide holes 8 are all located outside the middle area 6 on the sheet material 10.

[0057] S1.2. According to the positions of the vertical positioning hole 50 , the convex bulge 22 and the shaping hole 21 , a transverse positioning hole 51 is punched out on the sheet material 10 .

[0058] In this way, the relative positions of the vertical positioning hole 50, the horizontal positioning hole 51, the convex hull 22 and the shaping hole 21 on the plane are completed, preparing for the subsequent positioning of the stamping and folding.

[0059] Specifically, in step S.1.1, the vertical positioning holes 50, and the convex ridge 22 and the shaping hole 21 located between the two vertical positioning holes 50 can be formed simultaneously by a single stamping operation or by stamping in separate steps. When stamping simultaneously by a single stamping operation, one more operation can be saved, thereby shortening the processing cycle accordingly.

[0060] When the vertical positioning holes 50, and the convex bulge 22 and the shaping hole 21 between the two vertical positioning holes 50 are formed by stamping in steps, step S.1.1 may include:

[0061] S1.1.1. Punch out two oppositely arranged vertical positioning holes 50 on the sheet material 10.

[0062] S1.1.2. Position and punch the convex bump 22 and the shaped hole 21 between the two vertical positioning holes 50, based on the positions of the vertical positioning holes 50. That is, based on the positions of the vertical positioning holes 50, determine the planar positions of the convex bump 22 and the shaped hole 21 on the sheet material 10 between the two vertical positioning holes 50. Then, use a stamping die with the corresponding shapes of the convex bump 22 and the shaped hole 21 to perform positioning and punching at these planar positions.

[0063] More specifically, the convex bump 22 and the shaping hole 21 may be positioned and punched out according to the positions of the vertical positioning hole 50 and the guide hole 8 to achieve more convenient and accurate positioning.

[0064] S1.2. Position and punch out the transverse positioning hole 51 in the sheet material 10 based on the positions of the vertical positioning hole 50, the convex bump 22, and the shaped hole 21. That is, the planar position of the transverse positioning hole 51 is determined in the sheet material 10 based on the positions of the vertical positioning hole 50, the convex bump 22, and the shaped hole 21. Then, a stamping die with a shape corresponding to the transverse positioning hole 51 is used to perform positioning and punching at this planar position.

[0065] More specifically, the transverse positioning hole 51 may be positioned and punched out according to the positions of the vertical positioning hole 50 , the convex bulge 22 , the shaping hole 21 , and the guide hole 8 , so as to achieve more convenient and accurate positioning.

[0066] Step S2: punching a shaping groove on the edge of the middle region 6 to form the side undercut structure 3 of the porous shielding cover.

[0067] Furthermore, in this embodiment, the molding groove includes a transverse molding groove 91 and a vertical molding groove 90 .

[0068] like Figures 4 to 5As shown, step S2 includes: punching out transverse molding grooves 91 on both sides of the middle region 6 parallel to the vertical positioning holes 50; and punching out vertical molding grooves 90 on both sides of the middle region 6 parallel to the transverse positioning holes 51. In other words, the transverse molding grooves 91 are perpendicular to the vertical positioning holes 50, and the vertical molding grooves 90 are perpendicular to the transverse positioning holes 51.

[0069] It should be noted that step S2 is not necessarily a separate step. It can be understood that step S2 can be a separate step; or step S2 can be incorporated into step S1; or step S2 can be incorporated into step S3; or step S2 can be partially incorporated into step S1 and partially incorporated into step S3.

[0070] Please refer to Figures 4 and 5 In this embodiment, the preferred process method is to combine part of step S2 with step S1 and the other part with step S3. This can rationally arrange the forming timing of the horizontal molding groove 91 and the vertical molding groove 90, and minimize the processing cycle while ensuring the quality of the finished product.

[0071] Specifically, in step S1.3, when punching the transverse positioning hole 51, a stamping die corresponding to the shape of the transverse positioning hole 51 and a stamping die corresponding to the shape of the transverse molding groove 91 are set at the same time. Because the directions of the transverse positioning hole 51 and the transverse molding groove 91 are consistent or parallel, the two can be formed together in the same stamping, thereby further shortening the processing time.

[0072] During the first stamping in step S3, a stamping die corresponding to the shape of the vertical groove 90 is also provided; or the shape of the vertical groove 90 is also designed into the stamping die used in step S3. Then, during the first stamping in step S3, the shape of the vertical groove 90 is simultaneously stamped out on the middle area 6.

[0073] like Figure 5 As shown, in step S3, to achieve good flatness and smoothness in the finished porous shielding cover, multiple stamping operations are performed simultaneously in the middle region 6 and the ear-forming regions 7. This forms the central porous structure 1 of the porous shielding cover in the middle region 6. Ears 20 with multiple folded edges are formed in the ear-forming regions 7, thereby forming the fixing structures 2 on both sides of the porous shielding cover.

[0074] Furthermore, in step S3 of this embodiment, the sheet material 10 is punched five times in succession. Figure 5The orientation shown is, from left to right, followed by the first punching, the second punching, the third punching, the fourth punching, and the fifth punching. As mentioned above, the vertical molding groove 90 can be formed together during the first punching.

[0075] The holes are punched three times to form the middle porous structure 1 of the porous shielding cover on the sheet material 10 . This can be achieved by replacing a mold with a different hole arrangement each time the punching is performed.

[0076] After four times of stamping and folding, the ears 20 with multiple folding edges are formed in the ear forming area 7, thereby forming the fixed position structure 2 on both sides of the porous shielding cover. The position of each stamping and folding edge is positioned on the sheet material 10, and the stamping and folding edge mold can be used to achieve it. Figure 5 The stamping and folding die is not shown in the figure.

[0077] In the fifth punching, one of the folded edges of the ear portion 20 of the fixed position structure 2 is flattened to form the following Figure 1-3 The fixing structure 2 on the porous shield is shown.

[0078] Furthermore, the at least two punching operations in step S3 also simultaneously flatten the edges of the middle area 6 inward to form the anti-scratch folded edges 4 .

[0079] Specifically, if Figures 5 to 7 As shown, after the contour positioning hole 5 is formed, the edge of the middle region 6 has sharp portions 93, which appear very sharp in the actual object. To avoid the risk of scratches to the operator when handling the actual object, the sharp portions 93 corresponding to the edges of the middle region 6 can be incorporated into the design layout of the stamping die used in step S3; or a separate flattening die can be provided corresponding to the edges of the middle region 6, thereby simultaneously flattening the edges of the middle region 6 inward during stamping to form the anti-scratch folded edge 4.

[0080] Theoretically, the anti-scratch fold 4 can be formed by flattening the sharp portion 93 twice. The first flattening forms a 90-degree bend in the sharp portion 93, and the second flattening forms a 180-degree bend in the sharp portion 93. Therefore, the at least two punching operations in step S3 can simultaneously flatten the edges of the middle region 6 inward to form the anti-scratch fold 4.

[0081] Furthermore, considering the actual operation difficulty, the quality control of the forming, and other factors, a work station can be left empty, that is, a stamping work station can be reserved, so that the shape of the anti-scratch fold 4 can be adjusted in practice. Therefore, in this embodiment, the three stampings in step S3 simultaneously flatten the edges of the middle area 6 inward to form the anti-scratch fold 4. Please refer to Figure 5 Specifically, the sharp portion 93 is flattened synchronously during the second, fourth and fifth stamping, and after the fifth stamping, a Figure 7 The anti-scratch folding edge 4 shown in FIG. Wherein, the station position of the fourth punching is the reserved punching station.

[0082] In addition, during the fourth punching, the intermediate porous structure 1 formed after the third punching is also flattened and shaped simultaneously.

[0083] like Figure 8 As shown, step S4 includes: performing multiple punching and folding operations on the edge of the middle area 6 to form the side undercut structure 3 of the porous shielding cover.

[0084] Furthermore, in this embodiment, to form the side undercut structure 3, step S4 includes:

[0085] S4.1. Punch the edge of the middle region 6 to complete the one-time folding of the side undercut structure 3 of the porous shielding cover.

[0086] S4.2. Please refer to Figure 8 To complete the secondary hemming, a punching operation is performed at the four corners of the middle region 6. Specifically, a special die with two vertically arranged diamond-shaped holes 60 is used for punching at the intersection of adjacent vertical positioning holes 50 and transverse positioning holes 51. This creates two diamond-shaped notches at the intersection of adjacent vertical positioning holes 50 and transverse positioning holes 51 (i.e., at each corner of the middle region 6), enabling the subsequent secondary hemming.

[0087] S4.3, stamping is performed again at the edge of the middle area 6 to complete the secondary folding of the side undercut structure 3 of the porous shielding cover. Figure 1-3 As shown, after the secondary folding, the side undercut structure 3 finally presents a V-shaped folding shape.

[0088] Furthermore, in this embodiment, the primary folding forming is completed by one-time stamping; the secondary folding forming is completed by two stampings.

[0089] Specifically, in step S4.1, one-time stamping is performed at four edge positions of the middle region 6 to complete one-time folding of the side undercut structure 3 of the porous shielding cover.

[0090] In step S4.3, the secondary folding of the side undercut structure 3 of the porous shielding cover is completed by two stamping steps. Step S4.3 includes:

[0091] S4.3.1. Perform a first punching operation at two opposite edge positions of the middle region 6 to complete the secondary folding of two side undercut structures 3 of the porous shielding cover.

[0092] S4.3.2. Perform a second punching operation at the other two opposite edge positions of the middle region 6 to complete the secondary folding of the other two side undercut structures 3 of the porous shielding cover.

[0093] It can be understood that in other embodiments, the one-time folding forming can also be completed by multiple stampings; the two-time folding forming can also be completed by one-time stamping.

[0094] like Figure 8 As shown, in order to realize the removal of the finished porous shielding cover from the sheet material 10 after forming, the porous shielding cover forming process method of the present invention may also include step S5: punching the four corners of the middle area 6 so that the porous shielding cover is removed from the sheet material 10 along its outer periphery, thereby obtaining the finished porous shielding cover.

[0095] Steps S1 to S5 are merely intended to illustrate the specific process for forming a porous shield in one embodiment of the present invention, and should not be construed as implying a specific temporal sequence for steps S1 to S5. As described above, preferably, a continuous die set can be employed to implement the present invention. When a continuous die is employed, the material strip moves a fixed distance after each punching operation. Steps S1 to S5 can be understood as being performed simultaneously on the same material strip. Of course, in other embodiments, if a die other than a continuous die is employed, steps S1 to S5 may also be sequentially executed.

[0096] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A porous shielding cover forming process, characterized in that: The following steps are involved: S1. Punching out a contour positioning hole (5) for positioning the outer peripheral contour of the porous shielding cover, a convex bulge (22) and a shaping hole (21) for forming a fixing structure (2) of the porous shielding cover on a sheet material (10); the contour positioning hole (5) defines a middle area (6) on the sheet material (10); the convex bulge (22) and the shaping hole (21) are located in the middle area (6); and the contour positioning hole (5) further defines an ear forming area (7) for forming the fixing structure (2) at the location of the convex bulge (22) and the shaping hole (21); S2, punching a shaping groove on the edge of the middle region (6) to form a side undercut structure (3) of the porous shielding cover; S3, performing multiple stamping operations simultaneously in the middle area (6) and the ear forming area (7) to form a middle porous structure (1) of the porous shielding cover and fixed position structures (2) on both sides of the porous shielding cover; In step S3, the sheet material (10) is punched five times in succession; wherein, after three punching operations, a middle porous structure (1) of the porous shielding cover is formed on the sheet material (10); after four punching operations, an ear (20) of the fixed position structure (2) of the porous shielding cover is formed in the ear forming area (7); and after the fifth punching operation, the folded edge of the ear (20) of the fixed position structure (2) is flattened; In step S3, at least two punching operations simultaneously flatten the edges of the middle region (6) inwards to form anti-scratch folded edges (4); S4, performing multiple punching and folding on the edge of the middle area (6) to form a side undercut structure (3) of the porous shielding cover; step S4 includes: S4.

1. Punching is performed at the edge of the middle region (6) to complete the one-step folding of the side undercut structure (3) of the porous shielding cover; S4.

2. To complete the secondary folding, punch out the four corners of the middle region (6); S4.3, stamping is performed again at the edge of the middle region (6) to complete the secondary folding of the side undercut structure (3) of the porous shielding cover; S5. Punching the four corners of the middle area (6) so that the porous shielding cover is removed from the sheet material (10) along its outer periphery.

2. The porous shielding cover forming process according to claim 1, characterized in that: The contour positioning hole (5) is strip-shaped and includes a transverse positioning hole (51) and a vertical positioning hole (50); the vertical positioning hole (50) and the transverse positioning hole (51) define the middle area (6); Step S1 includes: S1.

1. Punching out two opposite vertical positioning holes (50) on the sheet material (10), and the convex bulge (22) and the shaping hole (21) located between the two vertical positioning holes (50); S1.

2. Positioning and punching the transverse positioning hole (51) on the sheet material (10) according to the positions of the vertical positioning hole (50), the convex bump (22) and the shaping hole (21).

3. The porous shielding cover forming process according to claim 2, characterized in that: In step S1.1, it further includes: punching out four guide holes (8) for auxiliary positioning at the four corners of the sheet material (10); the guide holes (8) are located outside the middle area (6).

4. The porous shielding cover forming process according to claim 1, characterized in that: In step S4.1, one-time stamping is performed at four edge positions of the middle region (6) to complete one-time folding forming of the side undercut structure (3) of the porous shielding cover.

5. The porous shielding cover forming process according to claim 1, characterized in that: The secondary folding of the side undercut structure (3) of the porous shielding cover is completed by two stamping operations. Step S4.3 includes: S4.3.

1. Performing a first punching operation at two opposite edge positions of the middle region (6) to complete the secondary folding of two side undercut structures (3) of the porous shielding cover; S4.3.

2. Perform a second stamping operation at the other two opposite edge positions of the middle region (6) to complete the secondary folding of the other two side undercut structures (3) of the porous shielding cover.

6. The porous shielding cover forming process according to claim 1, characterized in that: The contour positioning hole (5) is strip-shaped and includes a transverse positioning hole (51) and a vertical positioning hole (50); the vertical positioning hole (50) and the transverse positioning hole (51) define the middle area (6); the molding groove includes a transverse molding groove (91) and a vertical molding groove (90); Step S2 comprises: punching the two side edges of the middle region (6) parallel to the vertical positioning hole (50) to form a transverse shaping groove (91); and punching the two side edges of the middle region (6) parallel to the transverse positioning hole (51) to form a vertical shaping groove (90).

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