Forming apparatus for a steel roof and method thereof

Abstract

A forming device and method of a steel top cover, comprising an upper die seat, a lower die seat and a material belt, the upper die seat comprises an upper die plate, a stripping plate, a center punch assembly, a notch punch, a flanging punch and a blanking punch, the lower die seat comprises a lower die plate, a die fixing plate, a stretching die, a forming punch and a flanging die, the die plate is fixedly arranged in the die fixing plate, the material belt is arranged between the stripping plate and the die fixing plate, the upper die plate drives the center punch assembly to press down, stretches the material belt to form a center groove, the material belt steps, the center groove continuously receives stamping, and a center hole is formed on the material belt; the forming punch stamps in the direction of approaching the upper die seat to form a convex on the material belt, the notch punch stamps the material belt to punch out a notch on the material belt, the blanking punch presses down to punch out a product on the material belt, and the flanging punch performs flanging operation on the product to form bending on both sides of the product; the method gradually stretches through multiple processes.

Description

Technical Field

[0001] This invention relates to the technical field of steel top cover forming, and more particularly to a steel top cover forming apparatus and method. Background Technology

[0002] Currently, conventional stamping processes face numerous technical challenges and bottlenecks when manufacturing multifunctional integrated steel top covers with large central drawn holes, precision scoring, bent edges, and raised bumps: 1. The size of the central drawn inner hole is in large proportion to the product's overall size, making the drawn portion prone to thinning; 2. The inner wall of the drawn hole has a required smoothness; 3. It is difficult to guarantee a surface flatness of 0.05; 4. The product material is nickel-plated steel with high hardness, and scoring will cause cracks in the product, and the material discharged from the scored area will affect the flatness; 5. The upper surface of the bent edge of the cover plate has flatness and minimum flatness requirements. Summary of the Invention

[0003] In view of the shortcomings and defects of the prior art, this invention provides a steel top cover forming device and method, and provides the following technical solution to achieve the goal of forming a better steel top cover that meets the requirements.

[0004] A forming device for a steel top cover includes an upper mold base, a lower mold base, and a strip material. The upper mold base includes an upper template, a stripper plate, a central punch assembly, a scoring punch, a flanging punch, and a blanking punch. The lower mold base includes a lower template, a die fixing plate, a stretching die, a forming punch, and a flanging die. The die fixing plate is fixedly disposed within the die fixing plate. The strip material is disposed between the stripper plate and the die fixing plate. The upper template drives the central punch assembly to press down, stretching the strip material to form a central groove. The strip material steps forward, and the central groove is continuously subjected to punching, forming a central hole on the strip material. The forming punch punches towards the upper mold base, forming a protrusion on the strip material. The scoring punch punches the strip material, punching out scoring marks. The blanking punch presses down, punching the product out of the strip material. After blanking, the flanging punch performs a flanging operation on the product, forming bent edges on both sides of the product.

[0005] Compared with the prior art, the present invention stretches the strip to form a central groove by setting a central punch assembly, and stretches it in a rounded transition manner to prevent scratches or indentations on the product surface, so as to ensure that the arc wall thickness of the final formed central hole does not become thin. When forming the upward convex bulge, the forming marks are formed, and some of the material that surges upward can also be discharged during the forming of the convex bulge. After subsequent forming can no longer affect the marks, a fine mark is made to ensure that the formed marks meet the product requirements. When forming the bending edge, a pre-fold line is first pre-made, then the material is cut out to form the product shape, and finally the outer edge bending edge is formed upward by flanging, so that the flatness and minimum flatness of the upper surface of the cover plate bending edge meet the requirements.

[0006] Furthermore, the central punch assembly includes a plurality of drawing punches and punching punches. The punch of the drawing punch is arc-shaped. During the stepping process of the strip, the diameter of the punch of the drawing punch gradually decreases, so that the central groove formed on the strip gradually decreases until it meets the requirements of the central hole. The punching punch presses the central groove to form the central hole. The central punch assembly includes a pre-forming punch, which punches out the pre-forming area of ​​the groove on the strip.

[0007] Through the above improvements, the central punch assembly includes several stretching punches and punching punches. The stretching punches are used to stretch the strip and form a central groove on the strip. Multiple stretching punches are used to stretch the strip step by step, and circular arc stretching is used to ensure that the circular arc wall thickness of the central groove does not become thin. During the process of forming the central hole, a pre-marking line is inserted to discharge the material first and reduce stress.

[0008] Furthermore, the flanging die is provided with a limiting protrusion, the lower end of the protrusion forms a mating groove, and the lower end of the flanging punch on the stripper plate is provided with a limiting groove. When the die is closed, the limiting protrusion engages with the mating groove, and the protrusion engages with the limiting groove. The product includes a bending section and a straightening section. After flanging, the bending section is engaged between the side wall of the flanging die and the limiting protrusion, and the straightening section abuts against the side wall of the flanging die.

[0009] Through the above improvements, a limiting protrusion is provided on the flanging punch, and a limiting groove is provided on the stripper plate. When the mold is closed, the limiting protrusion and the matching groove are engaged and matched. The protrusion and the limiting groove are engaged and matched. The limiting protrusion is used to fix the strip and prevent the product on the strip from shifting during the flanging process. The product includes a bending section and a straightening section. The bending section is engaged and matched between the side wall of the flanging die and the limiting protrusion, so that the forming effect of the bending edge is better.

[0010] Furthermore, the lower template is provided with positioning posts, and the material strip is fixedly mounted on the positioning posts.

[0011] With the above improvements, positioning posts are set on the lower template, and the strip is fixed on the positioning posts, which can better fix the strip and improve the accuracy and stability of stamping.

[0012] Furthermore, an air blowing device is provided on the side of the lower mold base near the flanging die.

[0013] With the above improvements, an air blowing device is provided on the side of the lower die holder near the flanging die. The air blowing device makes it easy for the product to be separated from the strip.

[0014] A method for forming a steel top cover is provided, and the specific steps of forming are as follows:

[0015] Step 1, Trimming and Punching: Feed the strip into the stamping equipment and feed it forward continuously. During the stepping process, punch trimming holes around the pre-forming area of ​​the strip product and punch positioning holes on both sides of the strip.

[0016] Step 2, Center Hole Forming: During the strip stepping process, a center groove is formed on the strip by the continuous pressing of the strip by several stretching punches. The diameter of the center groove is gradually reduced by the continuous stretching of the strip through the center hole until it matches the size of the final formed center hole. The punching punch presses the center groove to form the center hole on the strip.

[0017] Step 3, Score Forming: During the material strip stepping process, the score punch on the upper die holder punches the side of the material strip closest to the upper die holder to form scores on the material strip;

[0018] Step 4, Bending edge forming: During the material strip stepping process, a pre-fold line is first formed on the side of the material strip close to the upper die base. Then, the product shape is cut out by the blanking punch, and the cut product shape is clamped on the material strip for flanging forming. Finally, the product is blown out of the material strip by air blowing.

[0019] Step 5, Waste Removal: During the material conveyor stepping process, after final forming, the remaining waste material on the material conveyor is removed.

[0020] Compared with existing technologies, the method provided by this invention uses multiple processes to gradually stretch the material, ensuring that the arc wall thickness of the final formed center hole remains unchanged, preventing surface scratches or indentations. After stretching, the center inner hole is punched, with the punch head punching the hole and the rear part tapering the sidewall to ensure the inner wall of the stretched hole meets the requirements. When forming the upward convex bulge, scoring is formed, and some of the material that surges upward can be discharged during the convex bulge formation. After subsequent forming can no longer affect the scoring, a fine scoring step is performed to ensure that the scoring meets the product requirements. When forming the outer edge bending edge, a pre-fold line is first pre-marked, then the material is blanked to cut out the product shape, and finally the bending edge is formed upward by flanging. Through this forming method, the flatness and minimum flatness of the upper surface of the cover plate bending edge can meet the requirements.

[0021] Furthermore, in step 2, the specific steps for forming the center hole are as follows:

[0022] Step 21, Strip stretching: During the strip stepping process, several stretching punches set on the upper die base punch the strip to form a central groove on the strip. Multiple stretching punches with gradually decreasing diameters are used to stretch the strip step by step to ensure the arc wall thickness during stretching.

[0023] Step 22, Score Pre-forming: During the material strip stepping process, when performing step 21, a score pre-forming area is punched out on the side of the material strip near the upper die holder.

[0024] Step 23, Center Hole Forming: During the material strip stepping process, the upper template drives the punching punch to punch the center groove on the material strip, forming a center hole on the material strip. The punching punch has a taper. During punching, the head of the punch punches the hole, and the rear part is extruded.

[0025] With the above improvements, a scoring pre-forming step is added in step 2 to reduce stress by first excluding the material, and then the excluded material is flattened by continuing to stretch and thin it.

[0026] Furthermore, in step 3, the specific steps for score forming are as follows:

[0027] Step 31, Scoring Forming: During the material strip stepping process, the scoring punch on the upper die holder punches the side of the material strip closest to the upper die holder to form scoring on the material strip;

[0028] Step 32, convex bulge forming: During the material strip stepping process, the forming punch on the lower die holder punches the material strip, and the pressure point of the material strip protrudes towards the upper die holder to form a convex bulge;

[0029] Step 33, Fine blanking: During the material strip stepping process, the formed blanks on the convex bulge are further refined.

[0030] Through the above improvements, an upward convex bump is formed after the forming groove. At this time, some of the material that surges upward can also be discharged during the forming of the convex bump. Finally, after the subsequent forming can no longer affect the groove, a fine-tuning step is taken to ensure that the formed groove meets the product requirements. Finally, after ensuring that the forming of the subsequent station has no impact on the groove, a fine-tuning is done again to ensure the stability of the groove and meet the product requirements.

[0031] Furthermore, in step 4, the specific steps for forming the bent edge are as follows:

[0032] Step 41, forming pre-fold lines: During the material strip stepping process, pre-fold lines are punched out on the side of the material strip close to the upper die holder;

[0033] Step 42, Product Blanking: During the material strip stepping process, the blanking punch on the upper die holder punches the material strip. After calculating the required allowance for the outer edge bending of the product, the product shape is cut out.

[0034] Step 43, Bending edge forming: During the material strip stepping process, the flanging die on the lower die base is used to fix the material strip, and the flanging punch on the upper die base punches the product of the material strip, punching the product into the flanging die. During the process of the product falling into the flanging die, the bending edge of the product is formed.

[0035] Step 44, Product detachment from the material strip: During the material strip stepping process, the product area on the material strip is blown by the air blowing device set on the lower die base, so that the product detaches from the material strip.

[0036] With the above improvements, after the previous forming process is completed, a pre-fold line is first made to reduce the flanging force. Then, after calculating the required allowance for the outer edge bending edge of the product, the product shape is cut out, clamped on the material strip and sent to the next process for flanging forming. Finally, the product is blown out by air, so that the flatness and minimum flatness of the upper surface of the cover plate bending edge can meet the requirements. Attached Figure Description

[0037] Figure 1 A flowchart of a method for forming a steel top cover;

[0038] Figure 2 This is a structural diagram of the material strip in a forming device for a steel top cover;

[0039] Figure 3 This is a structural diagram of a steel top cover forming device during mold closing.

[0040] Figure 4 This is a structural diagram of a molding device for a steel top cover during mold opening.

[0041] Figure 5 This is an enlarged structural view of point A during the mold closing process of a forming device for a steel top cover.

[0042] Figure 6 This is a structural diagram of a steel top cover forming device.

[0043] Among them, 100, trimming and punching station; 101, center groove forming station; 102, scoring pre-forming station; 103, center hole forming station; 104, scoring forming station; 105, convex bulge forming station; 106, fine blanking station; 107, pre-folding station; 108, blanking station; 109, flanging station; 110, scrap removal station; 1, upper die base; 1.1, upper template; 1.2, stripper plate; 1.3, center punch assembly; 1.31, drawing punch; 1.32, punching punch; 1.33, pre-forming punch; 1.4, scoring punch; 1 1.5 Flanging punch; 1.51 Limiting groove; 1.6 Blanking punch; 2. Lower die base; 2.1 Lower template; 2.2 Die fixing plate; 2.3 Stretching die; 2.4 Forming punch; 2.5 Flanging die; 2.51 Limiting protrusion; 2.6 Positioning pin; 2.7 Air blowing device; 3. Strip material; 3.1 Center groove; 3.2 Center hole; 3.3 Protrusion; 3.4 Score; 3.5 Product; 3.6 Bending edge; 3.61 Bending section; 3.62 Straightening section; 3.7 Mating groove; 3.8 Trimming hole; 3.9 Positioning hole. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] like Figures 1 to 6 As shown, a forming device for a steel top cover includes an upper mold base 1, a lower mold base 2, and a strip material 3. The upper mold base 1 includes an upper template 1.1, a stripper plate 1.2, a central punch assembly 1.3, a scoring punch 1.4, a flanging punch 1.5, and a blanking punch 1.6. The lower mold base 2 includes a lower template 2.1, a die fixing plate 2.2, a stretching die 2.3, a forming punch 2.4, and a flanging die 2.5. The die fixing plate is fixedly disposed within the die fixing plate 2.2. The strip material 3 is disposed between the stripper plate 1.2 and the die fixing plate 2.2. The upper template 1.1 drives the central punch assembly 1.6. The punch assembly 1.3 presses down, stretching the strip 3 to form a center groove 3.1. The strip 3 steps forward, and the center groove 3.1 is continuously pressed, forming a center hole 3.2 on the strip 3. The forming punch 2.4 presses towards the upper die holder 1, forming a protrusion 3.3 and a notch 3.4 on the strip 3. The punch 1.4 presses the strip 3, punching out notches 3.4 on the strip 3. The blanking punch 1.6 presses down, punching out the product 3.5 on the strip 3. After blanking, the flanging punch 1.5 performs a flanging operation on the product 3.5, forming bent edges 3.6 on both sides of the product 3.5.

[0047] The central punch assembly 1.3 includes several drawing punches 1.31 and punching punches 1.32. The punch of the drawing punch 1.31 is arc-shaped. During the stepping process of the strip 3, the diameter of the punch gradually decreases, so that the central groove 3.1 formed on the strip 3 gradually decreases until it meets the requirements of the central hole 3.2. The drawing punch 1.31 is used to draw the strip 3 and form the central groove 3.1 on the strip 3. Multiple drawing punches 1.31 are used to draw gradually and arc-shaped to ensure that the arc wall thickness of the central groove 3.1 does not become thin. The punching punch 1.32 punches the central groove 3.1 to form the central hole 3.2.

[0048] The central punch assembly 1.3 includes a pre-forming punch 1.33, which punches out a pre-forming area with etched marks 3.4 on the strip 3. During the forming process of the central hole 3.2, a pre-cutting line is inserted to discharge the material first and reduce stress.

[0049] A limiting protrusion 2.51 is provided on the flanging die 2.5, and a mating groove 3.7 is formed at the lower end of the protrusion 3.3. A limiting groove 1.51 is also provided at the lower end of the flanging punch 1.5. When the mold is closed, the limiting protrusion 2.51 and the mating groove 3.7 are engaged and mated, and the protrusion 3.3 and the limiting groove 1.21 are engaged and mated. The limiting protrusion 2.51 is used to fix the strip 3 to prevent the product 3.5 on the strip 3 from shifting during the flanging process. The product 3.5 includes a bending section 3.51 and a straightening section 3.52. After flanging, the bending section 3.51 is engaged between the side wall of the flanging die 2.5 and the limiting protrusion 2.51, so that the forming effect of the bending edge 3.6 is better.

[0050] The lower template 2.1 is provided with positioning posts 2.6, and the strip 3 is fixedly set on the positioning posts 2.6, which can effectively fix the strip 3 and improve the accuracy and stability during stamping.

[0051] An air blowing device 2.7 is also provided on the side of the lower die base 2 near the flange die 2.5. The air blowing device 2.7 can facilitate the product 3.5 to be separated from the strip 3.

[0052] A molding method for preventing the chamfer of the injection hole opening from being eccentric, the method flow is as follows: Figure 1 As shown, in the direction of the forward feeding of the material strip 3, there are respectively provided a cutting and punching station 100, a center groove forming station 101, a center hole forming station 102, a scoring pre-forming station 103, a scoring forming station 104, a convex bulge forming station 105, a fine blanking station 106, a pre-folding station 107, a blanking station 108, a flanging station 109, and a waste material removal station 110.

[0053] A method for forming a steel top cover is provided, and the specific steps of forming are as follows:

[0054] Step 1, Trimming and Punching: Feed the strip 3 into the stamping equipment and make the strip 3 continuously step forward on the stamping equipment. During the stepping process of the strip 3, trimming holes 3.8 are punched around the pre-forming area of ​​the product 3.5 of the strip 3, and positioning holes 3.9 are punched on both sides of the strip 3.

[0055] Step 2, Forming the center hole 3.2: During the stepping process of the strip 3, the center groove 3.1 is formed on the strip 3 by the continuous pressing of the strip 3 by several stretching punches 1.31. The diameter of the center groove 3.1 is gradually reduced by the continuous stretching of the strip 3 through the center hole 3.2 until it matches the size of the final formed center hole 3.2. The punching punch 1.32 presses the center groove 3.1 to form the center hole 3.2 on the strip 3.

[0056] In step 2, the specific steps for forming the center hole 3.2 are as follows:

[0057] Step 21, Strip 3 stretching: During the stepping process of strip 3, several stretching punches 1.31 set on the upper die holder 1 stamp the strip 3 to form a central groove 3.1 on the strip 3. Multiple stretching punches 1.31 with gradually decreasing diameters are used to stretch the strip 3 step by step to ensure the arc wall thickness during stretching.

[0058] Step 22, Score 3.4 preforming: During the stepping process of strip 3, when performing step 21, the score 3.4 preforming area is punched out on the side of strip 3 near the upper mold base 1;

[0059] Step 23, forming the center hole 3.2: During the stepping process of the strip 3, the upper template 1.1 drives the punching punch 1.32 to punch the center groove 3.1 on the strip 3, forming the center hole 3.2 on the strip 3. The punching punch 1.32 has a taper. During punching, the head of the punching punch 1.32 punches the hole, and the rear part is extruded.

[0060] By adding a scoring step 3.4 pre-forming in step 2 to reduce stress during material discharge, the discharged material is then flattened by continuing to stretch and thin it.

[0061] Step 3, Score 3.4 Forming: During the stepping process of the strip 3, the score 3.4 punch 1.4 on the upper die holder 1 stamps the side of the strip 3 near the upper die holder 1 to form the score 3.4 on the strip 3.

[0062] In step 3, the specific steps for forming the notch 3.4 are as follows:

[0063] Step 31, Score 3.4 Forming: During the stepping process of the strip 3, the score 3.4 punch 1.4 on the upper die holder 1 punches the side of the strip 3 near the upper die holder 1 to form the score 3.4 on the strip 3;

[0064] Step 32, Forming of the protrusion 3.3: During the stepping process of the strip 3, the forming punch 2.4 on the lower die holder 2 presses the strip 3, and the pressed part of the strip 3 protrudes towards the upper die holder 1 to form the protrusion 3.3;

[0065] Step 33, Fine blanking 3.4: During the stepping process of the strip 3, the formed blanking 3.4 on the convex 3.3 is further finely processed.

[0066] After forming the groove 3.4, form the upward protrusion 3.3. At this time, some of the material that surges upward can also be discharged when forming the protrusion 3.3. Finally, after subsequent forming can no longer affect the groove 3.4, refine the groove 3.4 again to ensure that the formed groove 3.4 meets the requirements of product 3.5. Finally, after ensuring that the forming of subsequent stations has no impact on the groove 3.4, refine it once more to ensure the stability of the groove 3.4 and meet the requirements of product 3.5.

[0067] Step 4, Bending edge 3.6 Forming: During the stepping process of the strip 3, a pre-fold line is first formed on the side of the strip 3 close to the upper die holder 1. Then, the blanking punch 1.6 cuts out the shape of the product 3.5 and clamps the cut-out product 3.5 on the strip 3 for flanging. Finally, the product 3.5 is blown out of the strip 3 by air blowing.

[0068] In step 4, the specific steps for forming the bending edge 3.6 are as follows:

[0069] Step 41, forming pre-fold lines: During the stepping process of the strip 3, pre-fold lines are punched out on the side of the strip 3 close to the upper die holder 1;

[0070] Step 42, Blanking of product 3.5: During the stepping process of strip 3, the blanking punch 1.6 on the upper die holder 1 punches strip 3. After calculating the required allowance for the outer edge bending edge 3.6 of product 3.5, the outer shape of product 3.5 is cut out.

[0071] Step 43, Bending edge forming: During the stepping process of the strip 3, the flanging die 2.5 on the lower die base 2 is used to fix the strip 3, and the flanging punch 1.5 on the upper die base 1 punches the product 3.5 of the strip 3, punching the product 3.5 into the flanging die 2.5. During the process of the product 3.5 falling into the flanging die 2.5, the bending edge 3.6 of the product 3.5 is formed.

[0072] Step 44, Product 3.5 detaches from material strip 3: During the stepping process of material strip 3, the air blowing device 2.7 set on the lower mold base 2 blows air onto the product 3.5 area on material strip 3, causing product 3.5 to detach from material strip 3.

[0073] Through the above improvements, after the forming process is completed, a pre-fold line is first made to reduce the flanging force. Then, after calculating the required allowance for the outer edge bending edge 3.6 of product 3.5, the shape of product 3.5 is cut out, clamped on the material strip 3 and sent to the next process for flanging. Finally, product 3.5 is blown out by air, so that the flatness and minimum flatness of the upper surface of the cover plate bending edge 3.6 can meet the requirements.

[0074] Step 5, Waste Removal: During the stepping process of strip 3, after final forming, the remaining waste on strip 3 is removed.

[0075] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A forming device for a steel top cover, characterized in that: The assembly includes an upper die base (1), a lower die base (2), and a strip (3). The upper die base (1) includes an upper template (1.1), a stripper plate (1.2), a central punch assembly (1.3), a scoring punch (1.4), a flanging punch (1.5), and a blanking punch (1.6). The lower die base (2) includes a lower template (2.1), a die fixing plate (2.2), a stretching die (2.3), a forming punch (2.4), and a flanging die (2.5). The strip (3) is disposed between the stripper plate (1.2) and the die fixing plate (2.2). The upper template (1.1) drives the central punch assembly (1.3) to press down, stretching the strip (3). A center groove (3.1) is formed, the strip (3) is stepped, the center groove (3.1) is continuously pressed, and a center hole (3.2) is formed on the strip (3); the forming punch (2.4) presses towards the upper die holder (1) to form a protrusion (3.3) on the strip (3); the scoring punch (1.4) punches the strip (3) to punch a score (3.4) on the strip (3); the blanking punch (1.6) presses down to punch out a product (3.5) on the strip (3); after blanking, the flanging punch (1.5) performs a flanging operation on the product (3.5), and bent edges (3.6) are formed on both sides of the product (3.5); The central punch assembly (1.3) includes several drawing punches (1.31) and punching punches (1.32). The punch of the drawing punch (1.31) is arc-shaped. During the stepping process of the strip (3), the diameter of the punch of the drawing punch (1.31) gradually decreases, and the central groove (3.1) formed on the strip (3) gradually decreases until it meets the requirements of the central hole (3.2). The punching punch (1.32) punches the central groove (3.1) to form the central hole (3.2). The central punch assembly (1.3) includes a pre-forming punch (1.33). The pre-forming punch (1.33) punches out the pre-forming area of ​​the groove (3.4) on the strip (3). The flanging die (2.5) is provided with a limiting protrusion (2.51), and the lower end of the protrusion (3.3) forms a mating groove (3.7). The flanging punch (1.5) is provided with a limiting groove (1.51). When the die is closed, the limiting protrusion (2.51) and the mating groove (3.7) are engaged and mated, and the protrusion (3.3) and the limiting groove (1.51) are engaged and mated. The product (3.5) includes a bending section (3.61) and a straightening section (3.62). After flanging, the bending section (3.61) is engaged between the side wall of the flanging die (2.5) and the limiting protrusion (2.51), and the straightening section (3.62) abuts against the side wall of the flanging die (2.5).

2. The forming device for a steel top cover according to claim 1, characterized in that: The lower template (2.1) is provided with a positioning post (2.6), and the material strip (3) is fixedly installed on the positioning post (2.6).

3. The forming device for a steel top cover according to claim 1, characterized in that: An air blowing device (2.7) is provided on the side of the lower mold base (2) near the flange die (2.5).

4. A forming apparatus for a steel top cover according to any one of claims 1-3, and a forming method for a steel top cover, characterized in that: The specific steps for molding are as follows: Step 1, Trimming and punching: Feed the strip (3) into the stamping equipment and feed the strip (3) forward continuously on the stamping equipment. During the stepping process of the strip (3), punch trimming holes around the pre-forming area of ​​the product (3.5) of the strip (3) and punch positioning holes on both sides of the strip (3). Step 2, forming the center hole (3.2): During the stepping process of the strip (3), the strip (3) is continuously pressed by several stretching punches (1.31) to form the center groove (3.1) on the strip (3). The strip (3) is continuously stretched by the center hole (3.2) so that the diameter of the center groove (3.1) gradually decreases until it matches the size of the final formed center hole (3.2); the punching punch (1.32) presses the center groove (3.1) to form the center hole (3.2) on the strip (3); Step 3, Scratching (3.4) forming: During the stepping process of the strip (3), the scratching punch (1.4) on the upper die holder (1) punches the side of the strip (3) close to the upper die holder (1) to form scratches (3.4) on the strip (3); Step 4, forming the bent edge (3.6): During the stepping process of the strip (3), a pre-fold line is first formed on the side of the strip (3) close to the upper die holder (1). Then, the blanking punch (1.6) cuts out the shape of the product (3.5) and clamps the cut-out product (3.5) on the strip (3) for flanging. Finally, the product (3.5) is blown out of the strip (3) by air blowing. Step 5, waste removal: During the stepping process of the strip (3), after final molding, the remaining waste on the strip (3) is removed.

5. The method for forming a steel top cover according to claim 4, characterized in that: In step 2, the specific steps for forming the center hole (3.2) are as follows: Step 21, Strip (3) stretching: During the stepping process of the strip (3), several stretching punches (1.31) set on the upper die holder (1) punch the strip (3) to form a central groove (3.1) on the strip (3). Multiple stretching punches (1.31) with gradually decreasing punch diameters are used to stretch the strip step by step to ensure the arc wall thickness during stretching. Step 22, Scratching (3.4) preforming: During the stepping process of the strip (3), when performing step 21, a scratch (3.4) preforming area is punched out on the side of the strip (3) close to the upper mold base (1); Step 23, forming the center hole (3.2): During the stepping process of the strip (3), the upper template (1.1) drives the punch (1.32) to punch the center groove (3.1) on the strip (3) to form the center hole (3.2) on the strip (3). The punch (1.32) has a taper. During punching, the head of the punch (1.32) punches the hole and the rear part is squeezed.

6. The method for forming a steel top cover according to claim 4, characterized in that: In step 3, the specific steps for forming the notch (3.4) are as follows: Step 31, Scratching (3.4) forming: During the stepping process of the strip (3), the scratching punch (1.4) on the upper die holder (1) punches the side of the strip (3) close to the upper die holder (1) to form scratches (3.4) on the strip (3); Step 32, Forming of the protrusion (3.3): During the stepping process of the strip (3), the forming punch (2.4) on the lower die holder (2) presses the strip (3), and the pressure point of the strip (3) protrudes towards the upper die holder (1) to form a protrusion (3.3); Step 33, fine blanking (3.4): During the stepping process of the strip (3), the formed blanks (3.4) on the convex bulge (3.3) are further finely processed.

7. The method for forming a steel top cover according to claim 4, characterized in that: In step 4, the specific steps for forming the bent edge (3.6) are as follows: Step 41, forming pre-fold lines: During the stepping process of the strip (3), pre-fold lines are punched out on the side of the strip (3) close to the upper mold base (1); Step 42, Product (3.5) blanking: During the stepping process of the strip (3), the blanking punch (1.6) on the upper die holder (1) punches the strip (3). After calculating the required allowance for the outer edge bending edge (3.6) of the product (3.5), the product (3.5) shape is cut out. Step 43, bending edge forming: During the stepping process of the strip (3), the flanging die (2.5) on the lower die base (2) is used to fix the strip (3), and the flanging punch (1.5) on the upper die base (1) punches the product (3.5) of the strip (3) and punches the product (3.5) into the flanging die (2.5). During the process of the product (3.5) falling into the flanging die (2.5), the bending edge (3.6) of the product (3.5) is formed. Step 44, Product (3.5) detaches from material strip (3): During the stepping process of material strip (3), the product (3.5) area on material strip (3) is blown by the air blowing device (2.7) set on the lower mold base (2) so that the product (3.5) detaches from material strip (3).

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