A circular arc wave cutting edge punching die and a punching force calculation method and system thereof

Abstract

The present invention discloses a circular arc wave cutting edge punching die and a method and system for calculating its punching force. The method comprises: establishing a cross-sectional model diagram when the convex cutting edge of the circular arc wave cutting edge punching die is about to cut out the lower surface of the sheet material; in the cross-sectional model diagram, calculating the overlapping area of ​​the circular arc wave cutting edge punching die and the overlapping area of ​​the sheet material, as well as the punching cross-sectional area of ​​the sheet material; calculating the standard punching force when the sheet material is punched with a flat cutting edge; and calculating the punching force when the circular arc wave cutting edge punching die punches the sheet material based on the overlapping area, the punching cross-sectional area and the standard punching force. A detailed method and process for calculating the punching force of the circular arc cutting edge is provided, which can accurately and quickly complete the calculation of the punching force, and is convenient for the promotion and use of the circular arc cutting edge.

Description

Technical Field

[0001] The invention relates to the technical field of blanking tool edge design, and in particular to a circular arc wave edge blanking die and a blanking force calculation method and system thereof. Background Art

[0002] In stamping production, blanking is a widely used processing method. The size of the blanking force is an important parameter that needs to be considered in the selection of stamping equipment, cost control, noise control, and quality control. Blanking is generally divided into flat edge blanking (see Figure 1 ) and wave edge punching, among which the most commonly used wave edge is the oblique edge form (see Figure 2 ). The use of wavy cutting edges can not only reduce the punching force, but also significantly reduce the vibration and noise during punching.

[0003] In addition to the commonly used bevel edge form, the wave edge also has a circular arc edge form (see Figure 3 ), the radius of the circle corresponding to the arc cutting edge is generally larger, also known as a large arc cutting edge. Traditionally, because the processing of the bevel cutting edge does not require wire cutting and CNC milling machines, it has cost advantages, so it is often used. The processing of large arc cutting edges requires the use of wire cutting and CNC milling machines, which are relatively expensive, so it is rarely used. However, with the popularization of wire cutting and CNC milling machines, the processing cost has been greatly reduced, especially for wire cutting processing equipment. The processing cost is close to that of ordinary milling machines and grinders, and the number of molds using large arc wavy cutting edges has also continued to increase. The significant advantage of the large arc cutting edge is that multiple cutting edges are punched at the same time, and the force on the mold is more uniform and balanced, which can significantly reduce noise and extend the service life of the mold. In recent years, the research on the structure of the wavy cutting edge and the calculation of the punching force has gradually increased, but it is basically estimated by multiplying the punching force of the flat cutting edge by a coefficient K, and there is also a lack of design research on the actual structure. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a circular arc wave edge punching die and a method and system for calculating the punching force thereof, which can reduce the punching force through the circular arc edge design and can calculate the punching force in advance and quickly, providing a theoretical calculation basis for the selection of the tonnage of the stamping machine tool.

[0005] In order to solve the above technical problems, the present invention provides a circular arc wavy cutting edge punching die, comprising a concave cutting edge and a convex cutting edge arranged adjacent to each other, the cutting edge arc lines of the concave cutting edge and the convex cutting edge are circular arc lines with the same radius, and the chord heights of the two circular arc lines are the same, and the chord height directions are both along the punching direction.

[0006] Preferably, the chord height of the arc line of the convex cutting edge is equal to the thickness of the sheet to be punched. This structure reduces the punching force even more. When the sheet thickness is t and the height of the large arc wave cutting edge is H=2t, the punching force is about 33.33% of the punching force of the flat cutting edge, which significantly saves the cost of the stamping process.

[0007] In order to solve the above technical problems, the present invention provides a method for calculating the blanking force based on the above arc wave edge blanking die, comprising the following steps:

[0008] Step 1: Create a cross-sectional model diagram of the convex cutting edge of the arc wave cutting edge punching die when it is about to cut out the lower surface of the sheet;

[0009] Step 2: In the cross-sectional model diagram, calculate the overlapping area of ​​the arc wave edge punching die and the overlapping area of ​​the sheet, as well as the punching cross-sectional area of ​​the sheet;

[0010] Step 3: Calculate the standard blanking force when the sheet is blanked with a flat edge;

[0011] Step 4: Calculate the blanking force of the arc wave edge blanking die when blanking the sheet according to the overlapping area, blanking cross-sectional area and standard blanking force.

[0012] Furthermore, assuming that the radius of the cutting edge arc of the convex cutting edge (2) is R, the chord height is h, and the corresponding arc area when the chord height of the cutting edge arc is x is S x , the plate thickness is t, the number of the convex cutting edges (2) and the concave cutting edges (1) are the same and are both n;

[0013] In step 2, calculating the overlapping area between the arc wave cutting edge punching die and the overlapping area of ​​the sheet material includes:

[0014] When the plate thickness t is less than the chord height h of the cutting edge arc of the convex cutting edge (2), the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is t is calculated. (x＝t) And multiply it by the number n of the convex cutting edges (2), which is the overlapping area;

[0015] When the plate thickness t is equal to the chord height h of the cutting edge arc of the convex cutting edge (2), the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is taken as h is calculated. (x＝h) And multiply it by the number n of the convex cutting edges (2), which is the overlapping area;

[0016] When the plate thickness t is greater than the chord height h of the cutting edge arc of the convex cutting edge (2) and less than 2h, the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is 2h-t is calculated. (x＝2h-t) , and calculate the cross-sectional area P of the sheet metal above the convex cutting edge (2) within the length of a single cutting edge (t-h) , S (x＝2h-t) and P (t-h)The sum is multiplied by the number n of the convex cutting edges (2) to obtain the overlapping area.

[0017] By providing a detailed calculation method for the blanking force of the arc cutting edge, the blanking force can be calculated accurately and quickly, the structural design of the arc cutting edge can be accelerated, the promotion and use of the arc cutting edge can be facilitated, and the blanking quality can be improved.

[0018] In order to solve the above technical problems, the present invention further provides a system based on the above blanking force calculation method, comprising:

[0019] An input module is used to obtain the following information of the circular wave cutting edge blanking die to be calculated: the cutting edge arc radius, the chord height, the number of the convex cutting edges and the concave cutting edges, and the plate thickness and material shear strength of the sheet to be blanked;

[0020] Comparison module: used to compare the plate thickness and chord height obtained by the input module to obtain the size relationship;

[0021] Storage module: used to store the overlapping area calculation formula corresponding to the size relationship between different plate thicknesses and chord heights;

[0022] The first calculation module is used to refer to the corresponding overlapping area calculation formula in the storage module according to the size relationship between the plate thickness and the chord height obtained by the comparison module, and bring in the plate thickness and the chord height obtained by the input module to calculate the overlapping area;

[0023] The second calculation module is used to calculate the blanking cross-sectional area and the standard blanking force according to the radius, chord height, number of convex cutting edges and concave cutting edges, plate thickness and material shear strength obtained by the input module;

[0024] The third calculation module: calculates the blanking force of the arc wave edge blanking die when blanking the sheet material according to the overlapping area, the blanking cross-sectional area and the standard blanking force;

[0025] Output module: used to output the blanking force value calculated by the third calculation module. This system can quickly and accurately calculate the blanking force of the arc wave edge blanking die, which can effectively save design time, reduce calculation workload, and improve accuracy when conducting relevant preliminary designs.

[0026] To sum up, the above-mentioned arc wavy edge punching die and its punching force calculation method and system are adopted to provide an optimal arc edge structure design, which can reduce the punching force; and through the punching force calculation method and system developed in this case, the punching force of the arc wavy edge punching die can be quickly calculated, providing a theoretical calculation basis for the selection of the tonnage of the stamping machine tool, saving design time and reducing calculation workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In the attached picture:

[0028] Figure 1 This is a schematic diagram of flat edge blanking.

[0029] Figure 2 This is a schematic diagram of oblique edge blanking.

[0030] Figure 3 It is a schematic diagram of arc wave edge punching.

[0031] Figure 4 It is a structural diagram of the circular arc wave cutting edge punching die of the present invention.

[0032] Figure 5 It is a schematic diagram of the punching of the circular arc wave cutting edge punching die of the present invention.

[0033] Figure 6 It is a schematic diagram of blanking when the plate thickness is smaller than the chord height of the arc cutting edge according to the present invention.

[0034] Figure 7 It is a blanking schematic diagram when the plate thickness is equal to the chord height of the arc cutting edge of the present invention.

[0035] Figure 8 It is a schematic diagram of blanking when the plate thickness is greater than the chord height of the arc cutting edge of the present invention. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0037] Example 1

[0038] Figure 4-5 The present invention shows a circular arc wave cutting edge punching die. The circular arc wave cutting edge punching die comprises a concave cutting edge 1 and a convex cutting edge 2 arranged adjacent to each other. The cutting edge arcs of the concave cutting edge 1 and the convex cutting edge 2 are circular arcs with the same radius, and the chord heights of the two circular arcs are the same, and the chord height directions are both along the punching direction. Figure 5 As shown: the cutting edge arc of the concave cutting edge 1 has a center of O', a radius of R (mm), a chord height of h (mm), and a chord length of S1 (mm); the cutting edge arc of the convex cutting edge (2) has a center of O, a radius of R (mm), a chord height of h (mm), and a chord length of S2 (mm), and S1 = S2.

[0039] Optionally, the arcs of the concave cutting edge 1 and the convex cutting edge 2 are connected to each other in the same plane, and the connection is smooth. The best way is to make the arcs of the concave cutting edge 1 and the convex cutting edge 2 tangent at the connection point, so that the cutting edge applies continuous and uniform force to the sheet during the cutting process, thereby improving the blanking quality.

[0040] Optionally, the chord height of the edge arc of the convex edge 1 is equal to the thickness of the sheet to be blanked. If the thickness of the sheet to be blanked is t (mm), then when t=h, the blanking force of the circular arc wave edge structure can be obtained through blanking force calculation. In addition, H=2h is set, H is the edge height of the circular arc wave edge blanking die, and the H value is generally not less than t.

[0041] like Figure 4 As shown in the figure, the sum of the arc chord lengths of the concave cutting edge 1 and the convex cutting edge 2 is the cutting edge unit length, and the cutting edge unit length value can divide the length of the sheet to be punched. A concave cutting edge 1 and a convex cutting edge 2 are connected to form a cutting edge unit. Usually, a tool cutting edge is composed of multiple cutting edge units. Let: L is the punching length (mm), that is, the length of the sheet to be punched, that is, the length of the tool cutting edge line; S is the cutting edge unit length (mm), then:

[0042] S = S1 + S2;

[0043] L = n*S; n = 1, 2, 3…

[0044] The length of the cutting edge unit and the number n of the cutting edge units are designed according to the length of the sheet to be punched. Flexible design is combined with actual needs. When punching, multiple arc cutting edges are punched at the same time, and the force is more uniform and stable.

[0045] During the blanking process of the circular arc wave edge blanking die, the magnitude of the instantaneous blanking force is constantly changing, and the blanking force to be calculated is actually to find the maximum force on the edge during the blanking process, which is used as the design blanking force. From the force analysis, the instantaneous blanking force is the force required to shear the plate by Δh in the blanking direction. Therefore, the magnitude of the instantaneous blanking force is related to the contact between the edge arc and the residual slab in the instantaneous state. Since the edge arc contacts the slab with the arc, but the blanking force is related to the contact width of the contact arc along the chord length of the edge, that is, the blanking force is positively correlated with the instantaneous contact width. The blanking force when the instantaneous blanking width is the largest is analyzed as the design blanking force. The conventional area ratio method is usually used to calculate the blanking force.

[0046] Analysis: ① When the plate thickness is less than the chord height, as the convex cutting edge 2 of the punching die penetrates into the plate, the instantaneous punching width gradually increases, and the punching force increases, until the convex cutting edge 2 is about to cut out the bottom surface of the plate, and the punching force at this time is assumed to be M1; after the convex cutting edge 2 cuts out the bottom surface of the plate, it can be seen from the arc structure of the cutting edge of the convex cutting edge 2 that when cutting out the same height, the width of the end of the convex cutting edge 2 moving out of the plate will be greater than the sum of the widths of the two sides cutting into the plate, and the instantaneous punching width decreases, so the punching force decreases, until the convex cutting edge 2 cuts out the plate and the concave cutting edge 1 cuts into the plate; as the concave cutting edge 1 cuts into the plate, the instantaneous punching width gradually increases, and the punching force continues to increase, until the top of the concave cutting edge 1 is about to cut into the plate. From the geometric relationship, it can be seen that the punching force at this time is equal to M1, and then the punching force will decrease. Therefore, when the plate thickness is less than the chord height, the maximum blanking force value occurs when the convex cutting edge 2 is about to cut out the bottom surface of the plate, or when the concave cutting edge 1 is about to cut into the surface of the plate.

[0047] ② When the plate thickness is equal to the chord height, the process is similar to the above process and will not be described in detail. The maximum blanking force value occurs when the convex cutting edge 2 is about to cut out the bottom surface of the plate, or when the concave cutting edge 1 is about to cut into the surface of the plate.

[0048] ③ When the plate thickness is greater than the chord height, as the convex cutting edge 2 of the punching die penetrates into the plate, the instantaneous punching width gradually increases, and the punching force increases, until the convex cutting edge 2 completely cuts into the plate and is about to cut out the bottom surface of the plate. Suppose the punching force at this time is M2; as the convex cutting edge 2 cuts out the bottom surface of the plate, it can be seen from the arc structure of the cutting edge of the convex cutting edge 2 that when cutting out the same height, the width of the end of the convex cutting edge 2 moving out of the plate will be greater than the sum of the widths of the concave cutting edge 1 cutting into the plate, and the instantaneous punching width decreases, so the punching force decreases, but because within a certain range close to the top of the concave cutting edge 1, the sum of the widths of the concave cutting edge 1 cutting into the plate will be greater than the cutting width of the convex cutting edge 2, the punching force gradually increases until the fixed point of the concave cutting edge 1 cuts into the plate. It can be seen from the geometric relationship that the punching force at this time is equal to M2, and then the punching force will decrease. Therefore, when the plate thickness is greater than the chord height, the maximum blanking force value also appears when the convex cutting edge 2 is about to cut out the bottom surface of the plate, or when the concave cutting edge 1 is about to cut into the surface of the plate.

[0049] Figure 4-8 The present invention shows a method for calculating the blanking force based on the above-mentioned arc wave cutting edge blanking die, comprising the following steps:

[0050] Step S01: Figure 4 As shown, a cross-sectional model diagram is established when the convex cutting edge 2 of the arc wave cutting edge blanking die is about to cut out the lower surface of the sheet material.

[0051] Step S02: In the cross-sectional model diagram, the overlapping area between the arc wave cutting edge punching die and the overlapping area of ​​the sheet material, and the punching cross-sectional area of ​​the sheet material are calculated.

[0052] (1) Calculate the overlapping area

[0053] Suppose the arc chord height of the convex cutting edge 2 is x, and the corresponding arc area is S x (mm 2 ), the chord length is S3 (mm), then the calculation formula of the sector area and triangle area can be obtained:

[0054]

[0055] Then from the trigonometric function relationship, we get:

[0056]

[0057]

[0058] but:

[0059]

[0060] Assume the plate thickness is t, the number of convex edges 2 and concave edges 1 is the same and both are n, and the overlapping area is S 阴 , the specific calculation process is as follows:

[0061] ① Such as Figure 6 As shown, if t<h, then

[0062]

[0063] ② If Figure 7 As shown, if t = h, then

[0064]

[0065] ③ Such as Figure 8 As shown, if 2h>t>h, the overlapping area is divided into two parts, which can be divided into S (x＝h) and the remaining part, assuming that the cross-sectional area of ​​the sheet metal that is higher than the convex cutting edge 2 within the length of a single cutting edge is P (t-h) ;but

[0066]

[0067]

[0068]

[0069] (2) Calculate the blanking cross-sectional area

[0070] ① Based on the cutting edge arc radius R and chord height h of the convex cutting edge 2, calculate the chord length S2 of the cutting edge arc of the convex cutting edge 2.

[0071]

[0072] ② Calculate twice the chord length S2 multiplied by the number of convex cutting edges 2 n, and then multiplied by the plate thickness t, which is the blanking cross-sectional area. Suppose the blanking cross-sectional area is S 平 , the specific calculation process is as follows:

[0073]

[0074] Step S03: Calculate the standard blanking force when the sheet is blanked with a flat blade. Assuming the standard blanking force is F0 (unit: N), the blanking force calculation formula for the flat blade is:

[0075] F0=K1*L*t*τ;

[0076] In the formula, L is the blanking length (mm), t is the plate thickness (mm), τ is the shear strength of the plate material (Mpa), and K1 is the safety factor. Considering factors such as the wear of the mold edge, the movement of the mold gap, the change of the material mechanical properties and the material thickness deviation, K=1.3 is generally taken.

[0077] Step S04: Calculate the blanking force of the circular arc wave edge blanking die when blanking the sheet material according to the overlapping area, the blanking cross-sectional area and the standard blanking force, set to F (unit: N). The calculation process includes:

[0078] ① Divide the overlapping area by the blanking cross-sectional area to obtain the proportional coefficient. Let the proportional coefficient be K2, then:

[0079] Optionally, for ease of calculation, the calculation of the proportionality factor K2 can be completed within one cutting edge length, which is the same as the calculation result within the entire blanking length, so Figure 6-8 The figure shows the position relationship between the punching edge and the sheet within one cutting edge length.

[0080] ② Multiply the proportional coefficient by the standard blanking force, and the calculated value is the blanking force when the arc wave edge blanking die blanks the sheet.

[0081]

[0082] The corresponding S 阴 , S 平 Substitute F0 into the calculation to find the solution.

[0083] In addition, through the above calculation process, the functional relationship between the blanking force F and the plate thickness t and the chord height can be obtained: F(t, h). In the actual production process, when the plate thickness t is given, through the functional relationship F(t, h)→F(h), it can be calculated that when h=t, the blanking force is the smallest, which is about 33.33% of F0. Therefore, the present invention also provides a circular arc wave cutting edge blanking die, including a concave cutting edge 1 and a convex cutting edge 2 arranged adjacently, the cutting edge arcs of the concave cutting edge 1 and the convex cutting edge 2 are circular arcs with the same radius, and the chord heights of the two circular arcs are the same, and the chord height directions are all along the blanking direction, and the cutting edge arc chord height of the convex cutting edge 1 is equal to the thickness of the plate to be blanked.

[0084] The present invention provides a blanking force calculation method system based on the above blanking force calculation method, comprising:

[0085] The input module is used to obtain the following information of the circular wave cutting edge blanking die to be calculated: the cutting edge arc radius and chord height of the convex cutting edge 2, the number of convex cutting edge 2 and concave cutting edge 1, and the plate thickness and material shear strength of the sheet to be blanked. ;

[0086] Comparison module: used to compare the plate thickness and chord height obtained by the input module to obtain the size relationship;

[0087] Storage module: used to store the overlapping area calculation formula corresponding to the size relationship between different plate thicknesses and chord heights;

[0088] The first calculation module is used to refer to the corresponding overlapping area calculation formula in the storage module according to the size relationship between the plate thickness and the chord height obtained by the comparison module, and bring in the plate thickness and the chord height obtained by the input module to calculate the overlapping area;

[0089] The second calculation module is used to calculate the blanking cross-sectional area and the standard blanking force according to the radius, chord height, number of convex cutting edge 2 and concave cutting edge 1, plate thickness and material shear strength obtained by the input module;

[0090] The third calculation module: calculates the blanking force of the arc wave edge blanking die when blanking the sheet material according to the overlapping area, the blanking cross-sectional area and the standard blanking force;

[0091] Output module: used to output the blanking force value calculated by the third calculation module.

[0092] Through modular system design, each step in the calculation process is completed by a corresponding module. A device with input and output such as a keyboard, mouse, and display can be designed to integrate these modules to automatically complete the blanking force calculation. In actual production life, when it is necessary to calculate the blanking force of a circular arc wave edge blanking die, directly input the corresponding edge arc radius of the convex edge 2, the chord height, the number of convex edges 2 and concave edges 1, and the thickness of the sheet to be blanked and the shear strength of the material and other design parameters into the input module, and the blanking force value can be directly obtained from the output module, which greatly simplifies the workload and improves efficiency.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A method for calculating the blanking force of a blanking die with a circular arc wave edge, characterized in that: The steps include: Step 1: Create a cross-sectional model diagram of the convex cutting edge (2) of the arc wave cutting edge punching die when it is about to cut out the lower surface of the sheet material; Step 2: In the cross-sectional model diagram, calculate the overlapping area of ​​the arc wave edge punching die and the overlapping area of ​​the sheet, as well as the punching cross-sectional area of ​​the sheet; Step 3: Calculate the standard blanking force when the sheet is blanked with a flat edge; Step 4: Calculate the blanking force of the arc wave edge blanking die when blanking the sheet material according to the overlapping area, the blanking cross-sectional area and the standard blanking force; The circular arc wave cutting edge punching die comprises a concave cutting edge (1) and a convex cutting edge (2) arranged adjacent to each other, the cutting edge arc lines of the concave cutting edge (1) and the convex cutting edge (2) are circular arc lines with the same radius, and the chord heights of the two circular arc lines are the same, and the chord height directions are both along the punching direction; In step 2, calculating the overlapping area between the arc wave cutting edge punching die and the overlapping area of ​​the sheet material includes: When the plate thickness t is less than the chord height h of the cutting edge arc of the convex cutting edge (2), the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is t is calculated. (x=t) And multiplied by the number n of convex edges (2), that is, the overlapping area; When the plate thickness t is equal to the chord height h of the cutting edge arc of the convex cutting edge (2), the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is taken as h is calculated. (x=h) And multiplied by the number n of convex edges (2), that is, the overlapping area; When the plate thickness t is greater than the chord height h of the cutting edge arc of the convex cutting edge (2) and less than 2h, the arc area S corresponding to the cutting edge arc of the convex cutting edge (2) when x is taken as 2h-t is calculated. (x=2h-t) , and calculate the cross-sectional area P of the sheet metal above the convex cutting edge (2) within the length of a single cutting edge (t-h) , S (x=2h-t) and P (t-h) The sum is then multiplied by the number n of convex cutting edges (2) to obtain the overlapping area; The fourth step comprises: Divide the overlap area by the blanking section area to get the proportionality factor; Multiply the proportionality coefficient by the standard blanking force, and the calculated value is the blanking force when the arc wave edge blanking die blanks the sheet.

2. A method for calculating blanking force according to claim 1, characterized in that: The cutting edge arcs of the concave cutting edge (1) and the convex cutting edge (2) are connected to each other in the same plane, and the connection is smoothly transitioned.

3. A blanking force calculation method according to claim 1 or 2, characterized in that: The cutting edge arcs of the concave cutting edge (1) and the convex cutting edge (2) are tangent at the connection point.

4. A method for calculating blanking force according to claim 1, characterized in that: The chord height of the arc line of the convex cutting edge (2) is equal to the thickness of the sheet material to be punched.

5. A blanking force calculation method according to claim 1, characterized in that: The sum of the chord lengths of the cutting edge arcs of the concave cutting edge (1) and the convex cutting edge (2) is the cutting edge unit length, and the cutting edge unit length value can divide the length of the sheet material to be punched.

6. A method for calculating blanking force according to claim 1, characterized in that: In step 2, the calculation of the blanking cross-sectional area of ​​the sheet includes: According to the arc radius R and the chord height h of the convex cutting edge (2), the chord length S2 of the arc of the cutting edge of the convex cutting edge (2) is calculated; Calculate twice the chord length S2, multiply by the number n of the convex cutting edges (2), and then multiply by the plate thickness t to obtain the blanking cross-sectional area.

7. A system based on the blanking force calculation method according to any one of claims 1 or 6, characterized in that: include: An input module is used to obtain the following information of the circular arc wave cutting edge punching die to be calculated: the cutting edge arc radius and chord height of the convex cutting edge (2), the number of the convex cutting edge (2) and the concave cutting edge (1), and the plate thickness and material shear strength of the sheet to be punched; Comparison module: used to compare the plate thickness and chord height obtained by the input module to obtain the size relationship; Storage module: used to store the overlapping area calculation formula corresponding to the size relationship between different plate thicknesses and chord heights; The first calculation module is used to refer to the corresponding overlapping area calculation formula in the storage module according to the size relationship between the plate thickness and the chord height obtained by the comparison module, and bring in the plate thickness and the chord height obtained by the input module to calculate the overlapping area; A second calculation module is used to calculate the blanking cross-sectional area and the standard blanking force according to the radius, chord height, number of convex cutting edges (2) and concave cutting edges (1), plate thickness and material shear strength obtained by the input module; The third calculation module: calculates the blanking force of the arc wave edge blanking die when blanking the sheet material according to the overlapping area, the blanking cross-sectional area and the standard blanking force; Output module: used to output the blanking force value calculated by the third calculation module.

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