Forming device and method for steel top cover

Abstract

The steel top cover forming device comprises an upper die base, a lower die base and a material belt, the upper die base comprises an upper die plate, a stripper plate, a central male die assembly, a nicking male die, a flanging male die and a blanking male die, the lower die base comprises a lower die plate, a female die fixing plate, a stretching female die, a forming male die and a flanging female die, the female die plate is fixedly arranged in the female die fixing plate, and the lower die plate is fixedly arranged in the female die fixing plate. A material belt is arranged between the stripper plate and the female die fixing plate, the upper die plate drives the center male die assembly to press downwards, the material belt is stretched to form a center groove, the material belt is stepped, the center groove is continuously punched, and a center hole is formed in the material belt. The forming male die conducts stamping in the direction close to the upper die base, a convex hull is formed on a material belt, the nicking male die conducts stamping on the material belt, nicks are punched on the material belt, the blanking male die presses downwards, a product is punched on the material belt, the flanging male die conducts flanging operation on the product after blanking, and the two sides of the product are formed and bent. According to the method provided by the invention, step-by-step stretching is carried out through multiple procedures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rigid top cover forming, and particularly relates to a steel top cover forming device and method. BACKGROUND

[0002] At present, in manufacturing such multifunctional integrated steel top cover with a large proportion of central tensile hole, precise scoring, bending edge and convex, the conventional stamping forming process faces many technical challenges and bottlenecks: 1. The size of the central tensile inner hole and the size of the product shape are in a large proportion, and the stretched part is prone to thinning; 2. The inner wall of the tensile hole has smoothness requirements; 3. It is difficult to guarantee the surface flatness of 0.05; 4. The product material is steel plated with nickel, which has high hardness, and the scoring will cause cracks in the product, and the material discharged by the scoring part will affect the flatness; 5. The upper surface of the cover plate bending edge has flatness and minimum plane requirements. SUMMARY

[0003] In view of the deficiencies and defects of the prior art, a steel top cover forming device and method are provided to achieve the purpose of forming a better steel top cover that meets the requirements.

[0004] A steel top cover forming device comprises 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 scoring punch, a flanging punch and a blanking punch, the lower die seat comprises a lower die plate, a concave die fixing plate, a stretching concave die, a forming punch and a flanging concave die, the concave die plate is fixedly arranged in the concave die fixing plate, the material belt is arranged between the stripping plate and the concave 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 is continuously subjected to stamping to form a center hole on the material belt; the forming punch is stamped towards the upper die seat to form a convex bump on the material belt, the scoring punch is stamped on the material belt to punch out a score, the blanking punch is pressed down to punch out a product on the material belt, and the flanging punch is used for flanging operation on the product after blanking to form bending edges on both sides of the product.

[0005] Compared with the prior art, the center punch assembly is arranged to stretch the material belt to form a center groove in a circular arc transition manner, so as to prevent the product surface from being scratched or causing a pressure mark, to ensure that the circular arc wall thickness of the finally formed center hole is not thinned, the score is formed when the convex bump is formed upwards, and the part of the material that flows upwards can also be discharged through the forming convex bump, so that the score formed by the subsequent forming cannot affect the score, and the score formed finally can meet the product requirements; when the bending edge is formed, a circle of pre-folding line is first punched, then the product shape is cut out, and finally the outer edge bending edge is formed upwards by the flanging method, so that the flatness and minimum plane of the upper surface of the cover plate bending edge can meet the requirements.

[0006] Further, the center punch assembly comprises a plurality of stretch punches and punching punches, the punch of the stretch punch is in the shape of a circular arc, and the diameter of the punch of the stretch punch gradually decreases during the stepping of the material belt, so that the center groove formed on the material belt gradually decreases until it meets the requirements of the center hole; the punching punch punches the center groove to form the center hole; the center punch assembly comprises a preforming punch, and the preforming punch punches the preforming area of the score on the material belt.

[0007] Through the above improvement, the center punch assembly comprises a plurality of stretch punches and punching punches, the stretch punch is used for stretching the material belt, the center groove is formed on the material belt, a plurality of stretch punches are used for gradual stretching, circular arc stretching is adopted to ensure that the circular arc wall thickness of the center groove does not become thin; during the center hole forming process, a pre-marking line is inserted to arrange the material and reduce the stress.

[0008] Further, a limiting protrusion is arranged on the flanging concave die, the lower end of the convex block forms a matching groove, and a limiting groove is arranged on the lower end of the flanging punch of the material removal plate, the limiting protrusion and the matching groove are arranged in clamping connection during clamping, and the convex block and the limiting groove are arranged in clamping connection; the product comprises a bending section and a straightening section, the bending section is arranged in clamping connection between the side wall of the flanging concave die and the limiting protrusion after flanging, and the straightening section abuts against the side wall of the flanging concave die.

[0009] Through the above improvement, a limiting protrusion is arranged on the flanging punch, a limiting groove is arranged on the material removal plate, the limiting protrusion and the matching groove are arranged in clamping connection during clamping, and the convex block and the limiting groove are arranged in clamping connection, the limiting protrusion is arranged to fix the material belt, so as to prevent the product on the material belt from deviating during flanging; the product comprises a bending section and a straightening section, the bending section is arranged in clamping connection between the side wall of the flanging concave die and the limiting protrusion, so that the forming effect of the bending edge is better.

[0010] Further, a positioning column is arranged on the lower die plate, and the material belt is fixedly arranged on the positioning column.

[0011] Through the above improvement, a positioning column is arranged on the lower die plate, and the material belt is fixedly arranged on the positioning column, so as to better fix the material belt and improve the accuracy and stability during stamping forming.

[0012] Further, a blowing device is arranged on one side of the lower die seat close to the flanging concave die.

[0013] Through the above improvement, a blowing device is arranged on one side of the lower die seat close to the flanging concave die, and the product can be conveniently separated from the material belt through the blowing device.

[0014] A forming method of a steel top cover is provided, and the specific steps are as follows: Step 1, trimming and punching: the material belt is sent into the stamping equipment, and the material belt is continuously fed forward on the stamping equipment, and a trimming hole is punched around the pre-forming area of the material belt product, and positioning holes are punched on both sides of the material belt during the material belt stepping; Step 2, center hole forming: during the material belt stepping, the material belt is continuously punched by a plurality of stretching punches to form a center groove on the material belt, and the center hole is continuously stretched to gradually reduce the diameter of the center groove until it is stretched to the size of the finally formed center hole; the center hole is formed on the material belt by punching the center groove with a punching punch; Step 3, forming a notch: during the material belt stepping, the notch punch on the upper die holder punches the side of the material belt close to the upper die holder to form a notch on the material belt; Step 4, forming a bent edge: during the material belt stepping, a pre-folding line is first formed on the side of the material belt close to the upper die holder, then the product shape is cut out by the blanking punch, and the cut-out product shape is clamped on the material belt for flanging forming, and finally the product is blown out from the material belt by blowing.

[0015] Step 5, waste cutting: after the final forming, the remaining waste on the material belt is cut off.

[0016] Compared with the prior art, the method provided by the application gradually stretches through multiple processes to ensure that the arc wall thickness of the finally formed center hole does not thin out, preventing the product surface from being scratched or causing indentation; after the stretching is completed, the center inner hole is punched, the punch head of the punching punch punches, and the rear part of the belt is tapered to extrude the side wall, so that the inner wall of the stretched hole meets the requirements; when the convexity is formed upward, the notch is formed, part of the upward flowing material can also be discharged when the convexity is formed, and the notch is further precisely punched after the subsequent forming cannot affect the notch, ensuring that the formed notch meets the product requirements; when the outer edge bent edge is formed, a pre-folding line is first formed, then the product shape is cut out, and finally the bent edge is formed upward by flanging. Through this forming method, the flatness and minimum plane of the upper surface of the cover plate bent edge can meet the requirements.

[0017] Further, in step 2, the specific steps of center hole forming are as follows: Step 21, stretching the material belt: during the material belt stepping, a plurality of stretching punches arranged on the upper die holder punch the material belt to form a center groove on the material belt, and a plurality of stretching punches with gradually decreasing diameters are used for gradual stretching to ensure the arc wall thickness during stretching; Step 22, notch pre-forming: during the material belt stepping, a notch pre-forming area is punched on the side of the material belt close to the upper die holder when step 21 is performed; Step 23, center hole forming: in the process of material strip stepping, the upper die plate drives the punching convex die to punch the center groove on the material strip, forming the center hole on the material strip, the punching convex die has a taper, and the head of the punching convex die punches when punching, and the rear part extrudes.

[0018] Through the above improvement, a pre-scar forming step is added in step 2 to reduce stress by discharging the material first, and then the discharged material is flattened by continuing to stretch and beat.

[0019] Further, in step 3, the specific steps of the notch forming are: Step 31, notch forming: in the process of material strip stepping, the notch convex die on the upper die seat punches the side of the material strip close to the upper die seat to form a notch on the material strip; Step 32, convexity forming: in the process of material strip stepping, the forming convex die on the lower die seat punches the material strip, and the pressed part of the material strip protrudes upward to form a convexity; Step 33, fine punching of notch: in the process of material strip stepping, the formed notch on the convexity is further processed.

[0020] Through the above improvement, the notch is formed after the notch is formed, and part of the material that flows upward can also be discharged when the convexity is formed. Finally, a step of fine punching of the notch is performed after the subsequent forming does not affect the notch, to ensure that the formed notch meets the product requirements. Finally, the notch is fine punched again to ensure the stability of the notch and meet the product requirements.

[0021] Further, in step 4, the specific steps of the bending edge forming are: Step 41, forming a pre-folding line: in the process of material strip stepping, a pre-folding line is punched on the side of the material strip close to the upper die seat; Step 42, product blanking: in the process of material strip stepping, the blanking convex die on the upper die seat punches the material strip, and after calculating the required allowance of the outer bending edge of the product, the product shape is cut out; Step 43, bending edge forming: in the process of material strip stepping, the flanging concave die on the lower die seat is used to fix the material strip, and the flanging convex die on the upper die seat punches the product of the material strip, which is punched into the flanging concave die. During the falling of the product into the flanging concave die, the bending edge forming of the product is completed; Step 44, product separation from the material strip: in the process of material strip stepping, the product area on the material strip is blown by the blowing device arranged on the lower die seat, so that the product is separated from the material strip.

[0022] Through the above improvement, after the forming of the previous process is completed, a pre-folding line is first punched to reduce the flanging force, and then after the required allowance of the product outer edge bending edge is calculated, the product shape is cut out, clamped on the material belt and sent to the next process for flanging forming, and finally the product is blown out through blowing, so that the flatness and minimum plane of the upper surface of the cover plate bending edge can meet the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A flow chart of a forming method of a steel top cover; Figure 2 A structure diagram of a material belt of a forming device of a steel top cover; Figure 3 A structure diagram of a forming device of a steel top cover when the mold is closed; Figure 4 A structure diagram of a forming device of a steel top cover when the mold is opened; Figure 5 An enlarged structure diagram of A when the mold of a forming device of a steel top cover is closed; Figure 6 A product structure diagram of a forming device of a steel top cover.

[0024] Wherein, 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 bump forming station; 106, fine punching station; 107, pre-folding line station; 108, blanking station; 109, flanging station; 110, waste material cutting station; 1, upper die holder; 1.1, upper die plate; 1.2, stripper plate; 1.3, center punch assembly; 1.31, stretching punch; 1.32, punching punch; 1.33, pre-forming punch; 1.4, scoring punch; 1.5, flanging punch; 1.51, limiting groove; 1.6, blanking punch; 2, lower die holder; 2.1, lower die plate; 2.2, concave die fixing plate; 2.3, stretching concave die; 2.4, forming punch; 2.5, flanging concave die; 2.51, limiting protrusion; 2.6, positioning column; 2.7, blowing device; 3, material belt; 3.1, center groove; 3.2, center hole; 3.3, convex bump; 3.4, scoring; 3.5, product; 3.6, bending edge; 3.61, bending section; 3.62, straightening section; 3.7, matching groove, 3.8, trimming hole; 3.9 positioning hole. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] As shown in Figures 1 to 6 A forming device for a steel top cover, comprising an upper die seat 1, a lower die seat 2 and a material strip 3, the upper die seat 1 comprising an upper die plate 1.1, a stripping plate 1.2, a center punch assembly 1.3, a notch 3.4 punch 1.4, a flanging punch 1.5 and a blanking punch 1.6, the lower die seat 2 comprising a lower die plate 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 plate being fixedly arranged in the die fixing plate 2.2, the material strip 3 being arranged between the stripping plate 1.2 and the die fixing plate 2.2, the upper die plate 1.1 driving the center punch assembly 1.3 to press downward, stretching the material strip 3 to form a center groove 3.1, the material strip 3 stepping, the center groove 3.1 continuously being subjected to stamping to form a center hole 3.2 on the material strip 3; the forming punch 2.4 stamping in the direction of approaching the upper die seat 1 to form a convex 3.3 on the material strip 3, the notch 3.4 punch 1.4 stamping the material strip 3 to punch out a notch 3.4 on the material strip 3, the blanking punch 1.6 pressing downward to punch out a product 3.5 on the material strip 3, the blanking flanging punch 1.5 performing flanging operation on the product 3.5 to form bending edges 3.6 on both sides of the product 3.5.

[0028] The center punch assembly 1.3 comprises a plurality of stretching punches 1.31 and punching punches 1.32, the punch of the stretching punch 1.31 being in the shape of a circular arc, in the process of stepping of the material strip 3, the diameter of the punch gradually decreases, so that the center groove 3.1 formed on the material strip 3 gradually decreases until it meets the requirements of the center hole 3.2, the stretching punch 1.31 is used for stretching the material strip 3 to form the center groove 3.1 on the material strip 3, a plurality of stretching punches 1.31 are used for gradual stretching, circular arc stretching is adopted to ensure that the circular arc wall thickness of the center groove 3.1 does not become thinner; the punching punch 1.32 punches the center groove 3.1 to form the center hole 3.2; The center punch assembly 1.3 comprises a pre-forming punch 1.33, the pre-forming punch 1.33 punches out a pre-forming area of the notch 3.4 on the material strip 3, in the process of forming the center hole 3.2, a pre-punching line is inserted to first discharge material to reduce stress.

[0029] The limiting protrusion 2.51 is arranged on the flanging concave die 2.5, the lower end of the convexity 3.3 is formed into a matching groove 3.7, and the limiting groove 1.51 is arranged at the lower end of the flanging convex die 1.5. When the mold is closed, the limiting protrusion 2.51 is in clamping cooperation with the matching groove 3.7, and the convexity 3.3 is in clamping cooperation with the limiting groove 1.21. When the mold is closed, the limiting protrusion 2.51 is in clamping cooperation with the matching groove 3.7, and the convexity 3.3 is in clamping cooperation with the limiting groove 1.51. The limiting protrusion 2.51 is arranged to fix the material belt 3, so as to prevent the product 3.5 on the material belt 3 from deviating 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 clamped between the side wall of the flanging concave die 2.5 and the limiting protrusion 2.51, so that the bending edge 3.6 has a better forming effect.

[0030] The lower die plate 2.1 is provided with a positioning column 2.6, and the material belt 3 is fixedly arranged on the positioning column 2.6, which can better fix the material belt 3 and improve the accuracy and stability during stamping forming.

[0031] The lower die seat 2 is further provided with a blowing device 2.7 near one side of the flanging concave die 2.5. The blowing device 2.7 can facilitate the product 3.5 to separate from the material belt 3.

[0032] A forming method for preventing the hole orifice chamfer of the liquid injection hole from being eccentric, the method flow is as shown in Figure 1 The cutting edge punching station 100, the center groove forming station 101, the center hole forming station 102, the notch pre-forming station 103, the notch forming station 104, the convexity forming station 105, the fine punching station 106, the pre-folding line station 107, the blanking station 108, the flanging station 109, and the waste material cutting station 110 are respectively arranged in the step-forward feeding direction of the material belt 3.

[0033] A forming method for a steel top cover is provided, and the specific steps of the forming are as follows: Step 1, cutting edge punching: the material belt 3 is sent into the stamping equipment, and the material belt 3 is continuously fed forward on the stamping equipment. In the process of the step-forward feeding of the material belt 3, the cutting edge hole 3.8 is punched around the pre-forming area of the product 3.5 of the material belt 3, and the positioning hole 3.9 is punched on both sides of the material belt 3.

[0034] Step 2, center hole 3.2 forming: in the process of the step-forward feeding of the material belt 3, the material belt 3 is continuously punched by a plurality of stretching convex dies 1.31, the center groove 3.1 is formed on the material belt 3, and the center hole 3.2 is continuously stretched on the material belt 3, so that the diameter of the center groove 3.1 gradually decreases until it is stretched to the size consistent with the finally formed center hole 3.2. The center hole 3.2 is formed on the material belt 3 by punching the center groove 3.1 by the punching convex die 1.32.

[0035] In step 2, the specific steps of center hole 3.2 forming are as follows: Step 21, stretch the material belt 3: during the step of the material belt 3, a plurality of stretch punches 1.31 arranged on the upper die holder 1 stamp the material belt 3 to form a center groove 3.1 on the material belt 3, and a plurality of stretch punches 1.31 with gradually decreasing diameters are used for step-by-step stretching to ensure the arc wall thickness during stretching; Step 22, pre-forming of score 3.4: during the step of the material belt 3, the pre-forming area of the score 3.4 is punched on the side of the material belt 3 close to the upper die holder 1 when step 21 is performed; Step 23, forming of center hole 3.2: during the step of the material belt 3, the upper die plate 1.1 drives the punching punch 1.32 to stamp the center groove 3.1 on the material belt 3 to form the center hole 3.2 on the material belt 3, and the punching punch 1.32 has a taper, and during punching, the head of the punching punch 1.32 punches, and the rear part is extruded.

[0036] By adding a step of pre-forming the score 3.4 in step 2, the material is first discharged to reduce stress, and then the stretched and thinned material is discharged by continuing to stretch and thin.

[0037] Step 3, forming of score 3.4: during the step of the material belt 3, the score 3.4 punch 1.4 on the upper die holder 1 stamps the side of the material belt 3 close to the upper die holder 1 to form the score 3.4 on the material belt 3.

[0038] In step 3, the specific steps of score 3.4 forming are as follows: Step 31, forming of score 3.4: during the step of the material belt 3, the score 3.4 punch 1.4 on the upper die holder 1 stamps the side of the material belt 3 close to the upper die holder 1 to form the score 3.4 on the material belt 3; Step 32, forming of convexity 3.3: during the step of the material belt 3, the forming punch 2.4 on the lower die holder 2 stamps the material belt 3, and the pressed part of the material belt 3 protrudes towards the upper die holder 1 to form the convexity 3.3; Step 33, fine punching of score 3.4: during the step of the material belt 3, the formed score 3.4 on the convexity 3.3 is further processed.

[0039] After forming the score 3.4, the upward convexity 3.3 is formed, at this time, part of the upward material can also be discharged through the forming convexity 3.3, and finally, after the subsequent forming does not affect the score 3.4, the score 3.4 is further punched to ensure that the formed score 3.4 meets the product 3.5 requirements; finally, after ensuring that the subsequent forming does not affect the score 3.4, the score 3.4 is further punched to ensure the stability of the score 3.4, and to meet the product 3.5 requirements.

[0040] Step 4, bending edge 3.6 forming: in the process of the strip 3 stepping, first, a pre-folding line is formed on the side of the strip 3 close to the upper die holder 1, then the shape of the product 3.5 is cut out by the blanking punch 1.6, and the cut-out product 3.5 shape is clamped on the strip 3 for flanging forming, and finally the product 3.5 is blown out from the strip 3 by blowing.

[0041] In step 4, the specific steps of bending edge 3.6 forming are as follows: Step 41, forming a pre-folding line: in the process of the strip 3 stepping, a pre-folding line is punched on the side of the strip 3 close to the upper die holder 1; Step 42, product 3.5 blanking: in the process of the strip 3 stepping, the blanking punch 1.6 on the upper die holder 1 punches the strip 3, and after calculating the required allowance of the product 3.5 outer edge bending edge 3.6, the product 3.5 shape is cut out; Step 43, bending edge forming: in the process of the strip 3 stepping, the flanging concave die 2.5 on the lower die holder 2 is used to fix the strip 3, and the flanging convex die 1.5 on the upper die holder 1 punches the product 3.5 of the strip 3, and the product 3.5 is punched into the flanging concave die 2.5, and in the process of the product 3.5 falling into the flanging concave die 2.5, the bending edge 3.6 of the product 3.5 is formed; Step 44, product 3.5 separation from the strip 3: in the process of the strip 3 stepping, the product 3.5 area on the strip 3 is blown by the blowing device 2.7 arranged on the lower die holder 2, so that the product 3.5 is separated from the strip 3.

[0042] Through the above improvement, after the forming of the previous process is completed, a pre-folding line is first punched to reduce the flanging force, then after calculating the required allowance of the product 3.5 outer edge bending edge 3.6, the product 3.5 shape is cut out, clamped on the strip 3 and sent to the next process for flanging forming, and finally the product 3.5 is blown out by blowing, so that the flatness and minimum plane of the upper surface of the cover plate bending edge 3.6 can meet the requirements.

[0043] Step 5, waste cutting: in the process of the strip 3 stepping, after the final forming, the remaining waste on the strip 3 is cut off.

[0044] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

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 die is fixedly disposed within the die fixing plate (2.2). 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, thereby... The strip (3) is stretched to form a center groove (3.1). The strip (3) is stepped, and the center groove (3.1) is continuously pressed to form a center hole (3.2) 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) presses the strip (3) to punch a score (3.4) on the strip (3). The blanking punch (1.6) presses down to punch 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 the product (3.5) has bent edges (3.6) formed on both sides.

2. The forming device for a steel top cover according to claim 1, characterized in that: 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).

3. The forming device for a steel top cover according to claim 1, characterized in that: 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 fitted together, and the protrusion (3.3) and the limiting groove (1.51) are engaged and fitted together. 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 and fitted between the side wall of the flanging die (2.5) and the limiting protrusion (2.51), and the straightening section (3.52) abuts against the side wall of the flanging die (2.5).

4. 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).

5. 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).

6. The forming apparatus for a steel top cover according to any one of claims 1-5, and a method for forming 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 (3.4) 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.

7. The method for forming a steel top cover according to claim 6, 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.

8. The method for forming a steel top cover according to claim 6, 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 (3.4) 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.

9. The method for forming a steel top cover according to claim 5, 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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