Method for improving flatness of metal plate based on convex hull machining procedure and keyboard support machining method

Abstract

The invention discloses a method for improving the flatness of a metal plate based on a convex hull machining procedure and a keyboard support machining method. The method for improving the flatness of the metal plate based on the convex hull machining procedure comprises the steps that when a metal plate is stamped by a stamping module to form a convex hull, the convex hull is formed; and the front face and the back face of the metal plate are integrally punched to form a front face pressing rib and a back face pressing rib surrounding the periphery of the convex hull. The keyboard support machining method comprises the step that in the keyboard support machining process, the convex hulls, the front face pressing ribs and the back face pressing ribs are formed in a punch forming mode through the method. According to the method for improving the planeness of the metal plate based on the convex hull machining procedure and the keyboard support machining method, the advantage that a plurality of convex hulls on a product structure are evenly distributed and formed is utilized, front-face and back-face light-depth pressing ribs are additionally arranged on the peripheries of the convex hulls of the product, and the convex hulls, front-face pressing ribs and back-face pressing ribs of the product are formed in one step through front-face and back-face stamping and pressing; the internal stress of poor flatness caused by the convex hull surface shape of the material can be dispersed while the hard spot punching process is canceled, and the production yield of products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of workpiece processing, and in particular to a method for improving the flatness of a sheet metal based on a convex hull processing procedure and a method for processing a keyboard bracket. Background Art

[0002] During the convex hull stamping process, the material is subjected to local pressure and undergoes plastic deformation. This deformation is not limited to the convex hull area, but also produces a pulling or squeezing effect on the surrounding materials. Due to the uneven deformation of various parts inside the material, internal stresses of mutual squeezing and twisting will be generated. These internal stresses may still exist in the material after the stamping is completed, causing overall or partial deformation of the product, such as bending or twisting, thereby affecting the flatness of the product and the accuracy of subsequent processing.

[0003] The current solution is to configure the convex hull process and the punching process on two stamping machines, and add a shaping device between the two machines. Although this solution can improve the flatness of the product to a certain extent, it has the following disadvantages: (1) High process complexity: multiple equipment and multiple processes are required, which increases the complexity and management difficulty of the production process; (2) High equipment cost: It is necessary to purchase additional shaping equipment, which increases the equipment investment cost; (3) High production cost: Due to the increase in process complexity and equipment cost, the production cost will inevitably increase. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a method for improving the flatness of sheet metal based on a convex hull processing process and a keyboard bracket processing method, which can reduce process complexity, reduce equipment cost and production cost, improve processing efficiency, and ensure product flatness.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: a method for improving the flatness of sheet metal based on a convex hull processing process is provided. When the sheet metal is punched by a stamping die to form a convex hull, the front and back surfaces of the sheet metal are punched integrally to form front and back embossed ribs surrounding the outer periphery of the convex hull.

[0006] Furthermore, the front embossed ribs, the back embossed ribs and the convex bumps are formed by stamping using the same stamping die set.

[0007] Furthermore, the stamping die set comprises:

[0008] An upper die punch, wherein the lower end surface of the upper die punch has a concave portion, and the lower end surface of the upper die punch is provided with a first convex surface for forming the front rib around the concave portion, and the height of the first convex surface is lower than the lower end surface of the upper die punch; and

[0009] A lower die punch, wherein the upper end face of the lower die punch has a convex portion arranged corresponding to the concave portion, and the upper end face of the lower die punch is provided with a second convex surface surrounding the convex portion for forming the reverse rib, and the height of the second convex surface is higher than the upper end face of the lower die punch.

[0010] Furthermore, the depth of the front embossed ribs and the back embossed ribs each accounts for 8% to 20% of the thickness of the sheet metal.

[0011] Furthermore, the thickness of the sheet metal is configured to be 0.2 mm, the depth of the front embossed rib is configured to be 0.03 mm, and the depth of the back embossed rib is configured to be 0.02 mm.

[0012] Furthermore, the width of the back-side rib is configured to be greater than the width of the front-side rib; on a horizontal projection plane, the back-side rib covers the front-side rib.

[0013] Furthermore, the width of the front rib is configured to be 0.5 mm, and the width of the back rib is configured to be 1 mm.

[0014] In order to solve the above technical problems, another technical solution adopted by the present invention is: providing a method for processing a keyboard bracket, during the processing, the method described above is used to stamp and form a convex bulge, a front embossed rib and a back embossed rib.

[0015] Furthermore, the processing method of the keyboard bracket includes the following steps:

[0016] Rough cutting of waste: With the keyboard bracket forming area as the center, the area around the keyboard bracket forming area on the sheet metal is regarded as the area to be cut off, and at least two discontinuous hollow cutting areas are cut off on the area to be cut off, and the at least two hollow cutting areas are not connected at the beginning and the end, and each area that is not connected at the beginning and the end forms a connecting part connecting the sheet metal and the keyboard bracket forming area;

[0017] Convex hull, front rib and back rib forming: forming convex hull, front rib and back rib;

[0018] Convex punching: each convex area is punched and perforated;

[0019] Processing button holes: processing button holes at the position corresponding to each button on the keyboard bracket molding area;

[0020] Cutting: Cut off the connecting part to separate the keyboard bracket from the sheet metal.

[0021] Furthermore, in the rough cutting process of the waste material, eight hollow cutting areas which are not connected end to end are punched out in the area to be cut, wherein:

[0022] The first hollow cut-out area, the second hollow cut-out area and the third hollow cut-out area are all distributed on one side of the keyboard bracket forming area along the transmission direction of the sheet metal, and the lengths of the first hollow cut-out area, the second hollow cut-out area and the third hollow cut-out area are all distributed along a direction perpendicular to the transmission direction;

[0023] The fourth hollow cut-out area, the fifth hollow cut-out area and the sixth hollow cut-out area are located on the other side of the keyboard bracket forming area along the transmission direction of the sheet metal, and the lengths of the fourth hollow cut-out area, the fifth hollow cut-out area and the sixth hollow cut-out area are distributed along a direction perpendicular to the transmission direction;

[0024] The seventh hollow cut-out area is distributed on one side of the keyboard bracket forming area along a direction perpendicular to the transmission direction, and the eighth hollow cut-out area is distributed on the other side of the keyboard bracket forming area along a direction perpendicular to the transmission direction; and the lengths of the seventh hollow cut-out area and the eighth hollow cut-out area are both distributed along the transmission direction of the sheet metal;

[0025] In the first to eighth hollow cut-out areas, a connecting portion is formed between every two adjacent hollow cut-out areas, and each edge of the keyboard bracket forming area is connected to the sheet metal through the corresponding connecting portion.

[0026] In summary, the present invention has the following beneficial effects: taking advantage of the uniform distribution of many convex hulls on the product structure, adding light depth ribs on the front and back sides around the convex hull of the product, and forming the convex hull, front ribs and back ribs of the product in one step by positive and negative punching, while eliminating the pitting process, it can disperse the internal stress caused by the convex hull surface of the material that causes poor flatness, improve the product production yield, and make the product reference size tolerance meet the customer's use requirements. Based on this, the present invention does not need to add additional shaping equipment and flatness processing technology, which reduces the process complexity, improves processing efficiency and saves processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a schematic diagram of the stamping state in which a stamping die simultaneously stamps a convex hull, a front embossed rib and a back embossed rib of a sheet metal in one embodiment of the method for improving the flatness of a sheet metal based on a convex hull processing procedure of the present invention.

[0029] Figure 2 yes Figure 1 Exploded diagram.

[0030] Figure 3 yes Figure 2 Enlarged view of part A in the figure.

[0031] Figure 4 yes Figure 2 Enlarged view of part B in the middle.

[0032] Figure 5 yes Figure 2 Enlarged view of part C in the middle.

[0033] Figure 6 It is a schematic diagram of the extrusion force flow direction when a stamping die stamps a convex hull, a front embossing rib and a back embossing rib of a sheet metal in one embodiment of the method for improving the flatness of a sheet metal based on a convex hull processing procedure of the present invention.

[0034] Figure 7 It is a flow chart of an implementation method of a keyboard bracket processing method of the present invention.

[0035] Figure 7a It is a schematic diagram of the process of punching positioning holes, roughly cutting waste materials, convex hulls and punching holes of the convex hulls in one embodiment of the keyboard bracket processing method of the present invention.

[0036] Figure 7b yes Figure 7a Enlarged view of the part D in the middle.

[0037] Figure 7c It is a schematic diagram of the process of processing key holes in one embodiment of the keyboard bracket processing method of the present invention.

[0038] Figure 7d It is a schematic diagram of the process of plane fine adjustment, material cutting and waste cutting in one embodiment of the keyboard bracket processing method of the present invention.

[0039] The accompanying drawings in the specification are as follows:

[0040] Sheet metal 100; convex 110; flat convex surface 111; first side elevation 112; outer rounded corner 113; flat concave surface 114; second side elevation 115; front rib 120; back rib 130; positioning hole 140; keyboard bracket forming area 150; first hollow cut-out area 151; second hollow cut-out area 152; third hollow cut-out area 153; fourth hollow cut-out area 154; fifth hollow cut-out area 155; sixth hollow cut-out area 156; seventh hollow cut-out area 157; eighth hollow cut-out area 158; connecting part 159; first section 15a; second section 15b; inner concave surface 15c; outer convex surface 15d;

[0041] The stamping die set 200 ; the upper die punch 210 ; the concave portion 211 ; the flat concave wall 211 a ; the first side wall 211 b ; the inner fillet 211 c ; the first convex surface 212 ; the lower die punch 220 ; the convex portion 221 ; the flat convex wall 221 a ; the second side wall 221 b ; and the second convex surface 222 . DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0045] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 1 It is a schematic diagram of the stamping state in which the stamping die simultaneously stamps the convex hull, the front embossing rib and the back embossing rib of the sheet metal. Figure 3 yes Figure 2 Enlarged view of part A in the figure. Figure 4 yes Figure 2 Enlarged view of part B in the middle. Figure 5 yes Figure 2 Enlarged view of part C in the middle. Figure 6 It is a schematic diagram of the extrusion force flow direction when the stamping die stamps the convex hull, front rib and back rib of the sheet metal.

[0046] Figures 1 to 6In the illustrated embodiment, the convex hull 110 is circular in a horizontal projection plane, and has a convex surface protruding from the front side (the upper surface shown in the figure) of the sheet metal 100. The convex surface has a flat convex surface 111 parallel to the front side of the sheet metal 100 and a first side elevation 112 surrounding the periphery of the flat convex surface 111 and connected between the flat convex surface 111 and the front side of the sheet metal 100, and an outer rounded corner 113 is formed between the first side elevation 112 and the flat convex surface 111. The convex hull 110 also has a concave surface concave inwardly on the reverse side (the lower surface shown in the figure) of the sheet metal 100. The concave surface has a flat concave surface 114 parallel to the reverse side of the sheet metal 100 and a second side elevation 115 surrounding the periphery of the flat concave surface 114 and connected between the flat concave surface 114 and the reverse side of the sheet metal 100.

[0047] The method for improving the flatness of the sheet metal 100 based on the convex hull 110 processing step according to the embodiment of the present invention is specifically that when the sheet metal 100 is punched by the punching die set 200 to form the convex hull 110, the front and back surfaces of the sheet metal 100 are punched integrally to form the front ribs 120 and the back ribs 130 surrounding the outer periphery of the convex hull 110. Preferably, the front ribs 120, the back ribs 130 and the convex hull 110 are punched and formed by the same punching die set 200.

[0048] The stamping die set 200 includes an upper punch 210 and a lower punch 220 .

[0049] The lower end surface of the upper die punch 210 has a concave portion 211, which is concavely arranged upward from the lower end surface of the upper die punch 210, and is shaped like the convex surface of the convex hump 110, and is used for punching and cooperating with the lower die punch 220 to form the convex surface (the flat convex surface 111 and the first side elevation surface 112) of the convex hump 110. In this embodiment, the concave portion 211 has a flat concave wall 211a shaped like the flat convex surface 111, and a first side wall 211b surrounding the outer periphery of the flat concave wall 211a and connected between the flat concave wall 211a and the lower end surface of the upper die punch 210, and an inner fillet 211c shaped like the outer fillet 113 is provided between the flat concave wall 211a and the first side wall 211b.

[0050] The lower end surface of the upper die punch 210 is provided with a first convex surface 212 for forming the front rib 120 around the concave portion 211, and the height of the first convex surface 212 is lower than the lower end surface of the upper die punch 210. Specifically, the height of the first convex surface 212 protruding from the lower end surface of the upper die punch 210 accounts for 8% to 20% of the thickness of the sheet metal 100, so that the front rib 120 after forming accounts for 8% to 20% of the thickness of the sheet metal 100, and the front rib 120 with this proportion can make the flatness of the sheet metal 100 better. Taking the sheet metal 100 with a thickness of 0.2mm as an example, the height of the first convex surface 212 protruding from the lower end surface of the upper die punch 210 can be configured to be 0.03mm (accounting for 15% of the thickness of the sheet metal 100), so that the height of the front rib 120 after forming is lower than 0.03mm of the front of the sheet metal 100. The width of the first convex surface 212 is preferably configured to be 0.5 mm, so that the width of the front rib 120 after molding is 0.5 mm.

[0051] The upper end surface of the lower die punch 220 has a convex portion 221 arranged corresponding to the concave portion 211. The convex portion 221 is formed by convexly protruding upward from the upper end surface of the lower die punch 220, and is shaped like the concave surface of the convex hump 110, and is used for punching and cooperating with the upper die punch 210 to form the concave surface (the flat concave surface 114 and the second side elevation surface 115) of the convex hump 110. In this embodiment, the convex portion 221 has a flat convex wall 221a shaped like the flat concave surface 114, and a second side wall 221b surrounding the outer periphery of the flat convex wall 221a and connected between the flat convex surface 111 and the upper end surface of the lower die punch 220. On the horizontal projection plane, the second side wall 221b is located in the inner side direction of the first side wall 211b (the second side wall 221b is closer to the center of the convex hump 110 in the radial direction, and the first side wall 211b is farther away from the center of the convex hump 110 in the radial direction).

[0052] The upper end surface of the lower die punch 220 is provided with a second convex surface 222 for forming the reverse rib 130 around the convex portion 221. The width of the second convex surface 222 is configured to be greater than the width of the first convex surface 212. On a horizontal projection plane, the second convex surface 222 covers (e.g., completely covers) the first convex surface 212, so that the width of the reverse rib 130 after forming is greater than the width of the front rib 120, and on a horizontal projection plane, the reverse rib 130 covers the front rib 120. Specifically, the inner edge of the second convex surface 222 extends to the second side wall 221b, so that the inner edge of the reverse rib 130 after forming is located inside the inner edge of the front rib 120. Compared with the outer edge of the first convex surface 212, the outer edge of the second convex surface 222 is further away from the center of the convex 110, so that the outer edge of the formed reverse rib 130 is located outside the outer edge of the front rib 120. In this way, the reverse rib 130 is configured to be wider than the front rib 120 and covers the front rib 120, which can repair the deformation and stress caused by punching the convex 110 from top to bottom. The configuration of the double-sided ribs breaks up and blocks the force around the convex 110, thereby locking the stress on the convex 110 and preventing it from spreading, so that no stress is generated in the area outside the convex 110, so as to ensure the flatness of the product.

[0053] The height of the second convex surface 222 is higher than the upper end surface of the lower die punch 220. Specifically, the height of the second convex surface 222 protruding from the upper end surface of the lower die punch 220 accounts for 8% to 20% of the thickness of the sheet metal 100, so that the reverse rib 130 after forming accounts for 8% to 20% of the thickness of the sheet metal 100, and the reverse rib 130 of this proportion makes the flatness of the sheet metal 100 better. Taking the sheet metal 100 with a thickness of 0.2mm as an example, the height of the second convex surface 222 protruding from the upper end surface of the lower die punch 220 can be configured to be 0.02mm (accounting for 10% of the thickness of the sheet metal 100), so that the height of the reverse rib 130 after forming is lower than 0.02mm on the reverse side of the sheet metal 100. The width of the second convex surface 222 is preferably configured to be 1mm, so that the width of the reverse rib 130 after forming is 1mm. The total depth of the front pressed rib 120 and the back pressed rib 130 may be configured to account for 16% to 30% of the thickness of the sheet metal 100 .

[0054] See also Figure 7 , is a flow chart of an implementation method of a keyboard bracket processing method of the present invention. Figure 7In the illustrated embodiment, the keyboard bracket is processed in an automated manner with continuous feeding and continuous processing. Those skilled in the art will appreciate that the processing method of the keyboard bracket described below is only a specific exemplary embodiment and is not intended to limit the present invention. The method of improving the flatness of the sheet metal 100 of the present invention can be applied to various processing methods of keyboard brackets that require processing of the convex bump 110.

[0055] The processing method of the keyboard bracket comprises the following steps:

[0056] S101, Punching positioning holes: see Figure 7a , punching positioning holes 140 on the sheet metal 100; wherein the positioning holes 140 are punched on one long side and / or two long sides of the sheet metal 100 perpendicular to the transmission direction. In this embodiment, the positioning holes 140 are punched on both sides of the sheet metal 100.

[0057] In the punching process, the sheet metal 100 is continuously conveyed forward, and each time the sheet metal 100 is conveyed to the punching station by one step, the punches on the first punching unit corresponding to the two lateral edges of the sheet metal 100 punch out the positioning holes 140. Thus, a plurality of positioning holes 140 with equal spacing are punched out on both long sides of the sheet metal 100. The positioning holes 140 are used for positioning in subsequent processes.

[0058] S102, Rough Cuttings: Please continue to refer to Figure 7a , with the keyboard support forming area 150 as the center, the area around the keyboard support forming area 150 on the sheet metal 100 is regarded as the area to be cut off, and at least two discontinuous hollow cut-out areas are cut off on the area to be cut off, and the at least two hollow cut-out areas are not connected at the beginning and the end, and each area not connected at the beginning and the end forms a connecting part 159 connecting the sheet metal 100 and the keyboard support forming area 150. Among them, the length direction of the keyboard support forming area 150 is parallel to the width direction of the sheet metal 100, and the width direction of the keyboard support forming area 150 is parallel to the length direction of the sheet metal 100.

[0059] In this embodiment, eight hollow cut-out areas that are not connected end to end are punched out in the area to be cut, wherein: the first hollow cut-out area 151, the second hollow cut-out area 152, and the third hollow cut-out area 153 are all distributed on one side of the keyboard bracket forming area 150 along the transmission direction of the sheet metal 100 (the length direction of the sheet metal 100), and the lengths of the first hollow cut-out area 151, the second hollow cut-out area 152, and the third hollow cut-out area 153 are all distributed along a direction perpendicular to the transmission direction (the width direction of the sheet metal 100). The fourth hollow cut-out area 154, the fifth hollow cut-out area 155, and the sixth hollow cut-out area 156 are located on the other side of the keyboard bracket forming area 150 along the transmission direction of the sheet metal 100, and the lengths of the fourth hollow cut-out area 154, the fifth hollow cut-out area 155, and the sixth hollow cut-out area 156 are all distributed along a direction perpendicular to the transmission direction. The seventh hollow cutout area 157 is distributed on one side of the keyboard support molding area 150 along a direction perpendicular to the transmission direction, and the eighth hollow cutout area 158 is distributed on the other side of the keyboard support molding area 150 along a direction perpendicular to the transmission direction; and the lengths of the seventh hollow cutout area 157 and the eighth hollow cutout area 158 are distributed along the transmission direction of the sheet metal 100. Among the first to eighth hollow cutout areas, a connecting portion 159 is formed between each two adjacent hollow cutout areas, and each edge of the keyboard support molding area 150 is connected to the sheet metal 100 through the corresponding connecting portion 159.

[0060] In the illustrated embodiment, the first hollow cut-out area 151 and the third hollow cut-out area 153 located at both ends of the long side of the keyboard support molding area 150, and the fourth hollow cut-out area 154 and the sixth hollow cut-out area 156 located at both ends of the other long side all have a first section 15a distributed along the length direction of the keyboard support molding area 150 and a second section 15b distributed along the short side direction of the keyboard support molding area 150 after being bent from the outer end of the first section 15a (the end facing the short side direction of the keyboard support molding area 150). Among them, the second section 15b of the first hollow cut-out area 151 and the second section 15b of the fourth hollow cut-out area 154 located at the same end extend in opposite directions, and the area between them is used to process the seventh hollow cut-out area 157. The second section 15b of the third hollow cut-out area 153 and the second section 15b of the sixth hollow cut-out area 156 located at the same end extend in opposite directions, and the area between them is used to process the eighth hollow cut-out area 158.

[0061] See also Figure 7bPreferably, the opposite sides of the second segment 15b of the first hollow cut-out area 151 and the second segment 15b of the fourth hollow cut-out area 154, and the opposite sides of the second segment 15b of the third hollow cut-out area 153 and the second segment 15b of the sixth hollow cut-out area 156 are all configured as inner concave surfaces 15c, and the shapes of the inner concave surfaces 15c may be in the shape of “(”, “)”, “<”, “>”, etc. Correspondingly, the two ends of the seventh hollow cut-out area 157 are respectively configured as outer convex surfaces 15d that are adapted to the shapes of the inner concave surfaces 15c of the first hollow cut-out area 151 and the fourth hollow cut-out area 154, such as the shapes of “<”, “>”, and the two ends of the eighth hollow cut-out area 158 are respectively configured as outer convex surfaces 15d that are adapted to the shapes of the inner concave surfaces 15c of the third hollow cut-out area 153 and the sixth hollow cut-out area 156, such as the shapes of “<”, “>”.

[0062] Based on the rough cutting waste steps described above, the two long side edges of the keyboard bracket molding area 150 can be connected to the sheet metal 100 through two connecting parts 159 distributed along the length direction thereof, and the two wide side edges of the keyboard bracket molding area 150 can be connected to the sheet metal 100 through two connecting parts 159 distributed along the width direction thereof, thereby improving the connection strength and stability of the keyboard bracket molding area 150 during the processing (each edge of the keyboard bracket molding area 150 has more than two connecting parts 159), preventing the keyboard bracket molding area 150 from easily separating from the sheet metal 100 during the processing due to fewer connecting points, thereby causing problems such as displacement caused by the keyboard bracket molding area 150 separating from the sheet metal 100 during the processing, preventing processing errors caused by the displacement of the keyboard bracket molding area 150, improving processing accuracy, and improving the yield of the keyboard bracket.

[0063] Preferably, the area of ​​each connecting part 159 at the long side edge of the keyboard bracket forming area 150 is larger than the area of ​​each connecting part 159 at the short side edge of the keyboard bracket forming area 150. That is, the width of each connecting part 159 at the long side edge of the keyboard bracket forming area 150 (the dimension along the width direction of the sheet metal 100) is larger than the width of each connecting part 159 at the short side edge of the keyboard bracket forming area 150 (the dimension along the length direction of the sheet metal 100).

[0064] Preferably, the rough cutting of waste includes the following two sub-steps: first, cutting off the first hollow cut-out area 151, the second hollow cut-out area 152, the third hollow cut-out area 153, the fourth hollow cut-out area 154, the fifth hollow cut-out area 155 and the sixth hollow cut-out area 156 at the two long side edges of the keyboard bracket molding area 150; secondly, cutting off the seventh hollow cut-out area 157 and the eighth hollow cut-out area 158 at the two wide (short) side edges of the keyboard bracket molding area 150.

[0065] In this embodiment, the positioning hole 140 punching process and the first hollow cut-out area 151, the second hollow cut-out area 152, the third hollow cut-out area 153, the fourth hollow cut-out area 154, the fifth hollow cut-out area 155 and the sixth hollow cut-out area 156 are performed in the same process step. The seventh hollow cut-out area 157 and the eighth hollow cut-out area 158 are cut out synchronously with the punching process, and the punching process is used to form a through hole based on the process requirements of the keyboard bracket. After the punching process, a step of shaping the through hole is also included to shape the through hole.

[0066] S103, forming the convex 110, the front rib 120 and the back rib 130: the keyboard bracket forming area 150 is covered with a plurality of convex ribs 110 spaced apart from each other, and the front side of the keyboard bracket forming area 150 (the front side of the sheet metal 100) forms a front rib 120 around the periphery of each convex 110, and the back side of the keyboard bracket forming area 150 (the back side of the sheet metal 100) forms a back rib 130 around the periphery of each convex 110. The specific forming method can be found in the above description, which will not be described one by one here. Since the keyboard bracket forming area 150 is covered with a plurality of convex ribs 110, these convex ribs 110 and their front ribs 120 and back ribs 130 can improve the flatness of the entire keyboard bracket forming area 150. Based on this step, the pockmarking process after the stamping process of the convex 110 in the prior art can be eliminated, thereby reducing the process complexity and manufacturing cost.

[0067] S104, punching the convex bump 110: punching each convex bump 110 area to form a hole.

[0068] S105, button hole processing: see Figure 7c , a key hole is processed at the position corresponding to each key on the keyboard support molding area 150. In this step, the key holes of various parts on the keyboard support molding area 150 are processed through multiple steps.

[0069] S106, flatness fine adjustment, see Figure 7d , used to fine-tune the flatness of the keyboard bracket molding area 150.

[0070] S107, Cutting: Please continue to refer to Figure 7d , cut off the connecting portion 159 to separate the keyboard bracket from the sheet metal 100.

[0071] In this step, the punching unit is made to punch downward the connecting portion 159 between each edge and the sheet metal 100 , and at the same time, the punching unit is made to punch downward the spacing portion between each two adjacent keyboard bracket forming areas 150 , so that the current keyboard bracket is separated from the sheet metal 100 .

[0072] S108, waste cutting: please continue to see Figure 7d , the two long sides of the sheet metal 100 are cut off to cut the continuous long sides into a plurality of waste blocks.

[0073] In summary, the present invention improves the flatness of sheet metal 100 based on the convex 110 processing procedure and the keyboard bracket processing method, and has the following beneficial effects: taking advantage of the uniform distribution of many convex 110 in the product structure, adding light depth ribs on the front and back sides around the convex 110 of the product, and forming the convex 110, the front rib 120 and the back rib 130 of the product in one step by positive and negative punching, while eliminating the pitting process, it can disperse the internal stress caused by the surface shape of the convex 110 of the material that causes poor flatness, improve the product production yield, and make the product reference size tolerance meet the customer's use requirements. Based on this, the present invention does not need to add additional shaping equipment and flatness processing technology, reduces the process complexity, improves processing efficiency and saves processing costs.

[0074] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for improving the flatness of sheet metal based on a convex hull processing step, characterized in that: When the sheet metal is punched by the punching die set to form a convex bulge, the front and back surfaces of the sheet metal are punched integrally to form front embossed ribs and back embossed ribs surrounding the outer periphery of the convex bulge.

2. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 1, characterized in that: The front embossed ribs, the back embossed ribs and the convex bumps are formed by stamping using the same stamping die set.

3. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 2, characterized in that: The stamping die set comprises: An upper die punch, wherein the lower end surface of the upper die punch has a concave portion, and the lower end surface of the upper die punch is provided with a first convex surface for forming the front rib around the concave portion, and the height of the first convex surface is lower than the lower end surface of the upper die punch; and A lower die punch, wherein the upper end face of the lower die punch has a convex portion arranged corresponding to the concave portion, and the upper end face of the lower die punch is provided with a second convex surface surrounding the convex portion for forming the reverse rib, and the height of the second convex surface is higher than the upper end face of the lower die punch.

4. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 1, characterized in that: The depth of the front ribs and the back ribs both accounts for 8% to 20% of the thickness of the sheet metal.

5. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 4, characterized in that: The thickness of the sheet metal is configured to be 0.2 mm, the depth of the front embossed rib is configured to be 0.03 mm, and the depth of the back embossed rib is configured to be 0.02 mm.

6. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 1, characterized in that: The width of the back pressure rib is configured to be greater than the width of the front pressure rib; on a horizontal projection plane, the back pressure rib covers the front pressure rib.

7. The method for improving the flatness of sheet metal based on a convex hull processing step according to claim 6, characterized in that: The width of the front rib is configured to be 0.5 mm, and the width of the back rib is configured to be 1 mm.

8. A method for processing a keyboard bracket, characterized in that: During the processing, the convex bulge, the front embossed rib and the back embossed rib are punched and formed by the method as described in any one of claims 1 to 7.

9. The method for processing a keyboard bracket according to claim 8, characterized in that: The following steps are involved: thick Cutting waste materials: taking the keyboard bracket forming area as the center, the area around the keyboard bracket forming area on the sheet metal is regarded as the area to be cut, and at least two discontinuous hollow cut-out areas are cut out on the area to be cut, wherein the at least two hollow cut-out areas are not connected at the beginning and the end, and each area not connected at the beginning and the end forms a connecting part connecting the sheet metal and the keyboard bracket forming area; Convex hull, front rib and back rib forming: forming convex hull, front rib and back rib; Convex punching: each convex area is punched and perforated; Processing button holes: processing button holes at the position corresponding to each button on the keyboard bracket molding area; Cutting: Cut off the connecting part to separate the keyboard bracket from the sheet metal.

10. The method for processing a keyboard bracket according to claim 9, characterized in that: In the rough cutting waste process, eight hollow cutting areas which are not connected end to end are punched out in the area to be cut, wherein: The first hollow cut-out area, the second hollow cut-out area and the third hollow cut-out area are all distributed on one side of the keyboard bracket forming area along the transmission direction of the sheet metal, and the lengths of the first hollow cut-out area, the second hollow cut-out area and the third hollow cut-out area are all distributed along a direction perpendicular to the transmission direction; The fourth hollow cut-out area, the fifth hollow cut-out area and the sixth hollow cut-out area are located on the other side of the keyboard bracket forming area along the transmission direction of the sheet metal, and the lengths of the fourth hollow cut-out area, the fifth hollow cut-out area and the sixth hollow cut-out area are distributed along a direction perpendicular to the transmission direction; The seventh hollow cut-out area is distributed on one side of the keyboard bracket forming area along a direction perpendicular to the transmission direction, and the eighth hollow cut-out area is distributed on the other side of the keyboard bracket forming area along a direction perpendicular to the transmission direction; and the lengths of the seventh hollow cut-out area and the eighth hollow cut-out area are both distributed along the transmission direction of the sheet metal; In the first to eighth hollow cut-out areas, a connecting portion is formed between every two adjacent hollow cut-out areas, and each edge of the keyboard bracket forming area is connected to the sheet metal through the corresponding connecting portion.

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