CN109033512B - A Judgment Method for Optimal Cutting Edge Shape of Fine Blanking Die - Google Patents

Abstract

The invention belongs to the technical field of die manufacturing, and discloses a method for judging the shape of an optimal cutting edge of a fine blanking die, which comprises the following steps: step 1, simulating to obtain a region in which plastic deformation occurs to a mold cutting edge in the fine blanking process; step 2, determining a cutting edge area to be analyzed; step 3, at least one of a cutting edge deformation quantity judging method, a cutting edge internal stress judging method and a die integral stress judging method is selected to judge the shape of the cutting edge; and step 4, obtaining a judging result. The beneficial effects of the invention include: the method utilizes finite element software to simulate the stress and plastic deformation of the cutting edge of the die in the processing process of a certain part, judges the stress and plastic deformation, helps to judge the shape of the optimal cutting edge, and has the advantages of strong universality, high accuracy, low cost, low risk and the like.

Description

A Judgment Method for Optimal Cutting Edge Shape of Fine Blanking Die

technical field

The invention relates to the technical field of die manufacturing, in particular to a method for judging the optimal cutting edge shape of a fine blanking die.

Background technique

The cutting edge of the fine blanking die is usually a circular cutting edge, and the fillet radius is much smaller than that of the ordinary die, and the fillet R of the fine blanking die is about 0.01-0.1mm.

Since the fine blanking die is subjected to a large reverse force from the sheet during its service, and it is mainly concentrated on the cutting edge of the die, cracks are most likely to occur inside the cutting edge of the die, resulting in die failure. In order to improve the life of the mold and reduce the force and deformation of the cutting edge of the mold as much as possible, there are currently two main ways to optimize the shape of the cutting edge of the mold. One is to constantly trim the shape of the cutting edge of the mold according to the experience of the engineer, and the other is to increase the radius of the mold fillet. The former method has certain risks, cannot guarantee a stable mold life, and the optimization cycle is long, and the applicable versatility is not strong. The latter method can easily lead to excessive burrs on the part. The commonality of the above problems is that it is impossible to scientifically ensure that the shape of the cutting edge of the die is in an optimal state.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a method for judging the optimal edge shape of a fine blanking die, and solve the technical problem in the prior art that there is no scientific determination of the optimal edge shape of a die.

In order to achieve the above-mentioned technical purpose, the present invention provides a method for judging the optimal cutting edge shape of a fine blanking die, comprising the following steps:

Step 1. For the initial die edge shape set for a certain part, a simulation cycle is performed on the fine blanking process of the part to obtain the plastically deformed area of the die edge during the fine blanking process.

Step 2, determining the cutting edge area to be analyzed, which includes the area where the plastic deformation occurs, and the area extending to the periphery of the area where the plastic deformation occurs. The extension area should not be too large, in order to ensure that the area where plastic deformation occurs can be included in the judgment and improve the accuracy of judgment.

Step 3: Select at least one of the following discrimination methods to determine the edge shape of the edge area to be analyzed: a method for determining the deformation of the cutting edge, a method for determining the internal stress of the cutting edge, and a method for determining the overall force of the mold.

The method for discriminating the amount of deformation of the cutting edge aims to ensure the stability of the cutting edge shape, and it includes the following steps:

Step 3.1.1, projecting the cutting edge area to be analyzed on a Cartesian coordinate grid, the number of grid nodes i _m in the cutting edge area to be analyzed is m, and the coordinates are i ₁ (x ₁ , y ₁ , z ₁ ), i ₂ (x ₂ , y ₂ , z ₂ )…i _m (x _m , y _m , z _m );

Step 3.1.2, sequentially calculate the deformation amount D _i,n of the node i at the cutting edge in the latest simulation cycle, the average deformation D _n of the cutting edge, and the variance of the cutting edge deformation

Among them, n represents the current total number of simulation cycles; m represents the number of nodes at the cutting edge of the fine blanking die currently being studied; D _1,n , D _2,n ,..., D _m,n represent the The first edge node, the second edge node...the deformation of the mth edge node; D _n is the mean value of D _1,n , D _2,n ,..., D _m,n , is the variance of D _1,n , D _2,n ,..., D _m,n ;

Step 3.1.3, judge "D _n < D ₀ , and "Whether it is true, if it is "Yes", it is determined that the shape of the cutting edge meets the judgment criteria in the discrimination method, that is, the shape of the cutting edge that is updated after the mold is initially obtained after being affected by plastic deformation; if it is "No", it is determined that the shape of the cutting edge does not meet the criteria The judgment standard in the judgment method; among them, D ₀ is the judgment standard value of the average value of the deformation of the cutting edge node, and its value logic depends on the mold precision standard in the fine blanking industry, generally not less than 0.01mm, not more than 0.1mm; /> It is the discriminative standard value of the variance of the deformation of the cutting edge node, and its value logic is 5-20% of _D0 .

The method for judging the maximum internal stress of the cutting edge aims to ensure that the concentrated stress of the cutting edge decreases and tends to be stable, and it includes the following steps:

Step 3.2.1, obtaining the maximum mises equivalent stress P _n,max of the cutting edge during the latest simulation cycle from the simulation results, where n represents the current total number of simulation cycles;

Step 3.2.2, judge whether "P _n,max <P ₀ "is true, if it is "yes", it is determined that the cutting edge shape meets the judging criteria in the judgment method, that is, the updated cutting edge shape after the mold is initially obtained after being affected by plastic deformation ; If it is "No", it is judged that the shape of the cutting edge does not meet the judgment criteria in the judgment method; among them, P ₀ is the standard value of stress judgment, and its value logic is a value between the yield strength and tensile strength of the mold material , and is close to the value of the yield strength of the mold material.

The method for discriminating the overall force of the die is aimed at reducing the load of the press and reducing energy consumption, which includes the following steps:

Step 3.3.1, obtain the maximum overall force F _n,max of the mold during the latest simulation cycle from the simulation results, and count the maximum overall force F _max of the mold obtained in the simulation results so far, where n represents the current total number of simulation cycles;

Step 3.3.2, judge whether "F _n,max /F _max <a" is true, if it is "yes", it is judged that the edge shape meets the judgment standard in the judgment method, that is, the updated edge after the plastic deformation of the mold is initially obtained If it is "No", it is judged that the shape of the cutting edge does not meet the judgment criteria in the discrimination method; where a is the drop standard value that the maximum overall force of the mold needs to meet, and its value logic is that the overall force of the mold is the largest The value needs to meet the trend of gradually decreasing with the increase of the number of simulation cycles, and the ratio of the maximum overall force of the mold to the maximum overall force of the mold in this and all previous simulation cycles must reach the maximum value of the overall force of the mold The standard value of the drop ratio, the value range of a is 0.6~0.9.

Step 4, if the cutting edge shape satisfies the judgment criteria in any of the above-mentioned discrimination methods, then it is judged that the cutting edge shape at this time is the optimal mold cutting edge shape; otherwise, the cutting edge shape at this time is taken as the new initial mold cutting edge shape , return to step 1. The optimal die edge shape is a gradually stable edge shape after multiple continuous fine blanking processes.

Step 5, calculate the wear of the die edge, and use the finite element software and the following wear model to calculate the wear of the die edge:

Among them, W is the amount of wear, K is the wear coefficient of the material, S is the average life of the mold, P is the contact stress, v is the sliding speed, and H is the Rockwell hardness of the material; the calculation of the wear of the cutting edge of the mold is based on the average life of the mold and The result of multiplying the wear of a single fineblanking.

Of course, if you are still unsatisfied with the shape of the cutting edge determined by the above method, you can continue to step 6, and redesign the obtained optimal mold cutting edge shape according to the specific working conditions, that is, perform secondary optimization, and the redesigned The cutting edge shape needs to meet the requirements of ensuring the processing quality of the part, the high similarity between the cutting edge shape and the calculation result, and the smooth transition of the cutting edge shape. After redesigning the optimal mold cutting edge shape, you can return to step 1 and judge through this method again.

Preferably, the simulation cycle includes a fine-blanking stamping process and a die springback process.

Preferably, the simulation cycle is realized by using finite element software, in which the mold (that is, the mold parts and sheets to be optimized) is set as an elastic-plastic body.

Preferably, the finite element software includes Abaqus and/or Deform. Abaqus is a powerful finite element software for engineering simulation, which can solve problems ranging from relatively simple linear analysis to many complex nonlinear problems. Abaqus includes a rich library of elements that can model arbitrary geometries. And it has various types of material model libraries, which can simulate the performance of typical engineering materials, including metals, rubber, polymer materials, composite materials, reinforced concrete, compressible superelastic foam materials, and geological materials such as soil and rock. In addition to solving a large number of structural (stress/displacement) problems, Abaqus can also simulate many problems in other engineering fields, such as heat conduction, mass diffusion, thermoelectric coupling analysis, acoustic analysis, rock and soil mechanics analysis (fluid penetration/stress coupling analysis) and piezoelectric dielectric analysis. Deform is a finite element-based process simulation system for analyzing various forming processes and heat treatment processes in metal forming and related industries. By simulating the entire machining process on the computer, it helps engineers and designers: design tools and product process, and reduce expensive field test costs. Improve mold design efficiency and reduce production and material costs. Shorten the research and development cycle of new products.

Compared with the prior art, the beneficial effects of the present invention include: using finite element software to simulate the force and plastic deformation of the die edge during the processing of a certain part, and judge it to help determine the optimal edge shape, which has universality Strong, high accuracy, low cost, small risk and other advantages; can significantly reduce the force and deformation of the fine blanking edge, delay the failure of the die; meet the higher requirements of the fine blanking industry for improving the life of the fine blanking die and reducing energy consumption damage the trend of.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is the cutting edge shape not judged by the present invention;

Fig. 3 is the cutting edge shape obtained after the judgment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The invention provides a method for judging the optimal cutting edge shape of a fine blanking die, which is used to optimize the cutting edge shape of various common fine blanking dies to prolong the life of the die. For the cutting edge that is deformed and gradually stable in shape due to stress in the multiple stamping process, based on the three judgment criteria for the deformation of the cutting edge, the internal stress of the cutting edge, and the overall force of the mold, the optimal die is calculated scientifically. Cutting edge shape, so as to reduce the force on the cutting edge of the mold and improve the life of the mold under the premise of ensuring the machining accuracy of the parts.

Specifically, the deformation of the cutting edge caused by force during the service of the fine blanking die includes two aspects. One is that the plastic deformation of the cutting edge causes the shape of the cutting edge to change, and the other is that the cutting edge wears and causes the shape of the cutting edge to change. The calculation of the plastic deformation of the cutting edge is based on the continuous simulation calculation of the accumulation of plastic deformation of the cutting edge during the fine blanking process of the fine blanking die, and the calculation of the wear amount of the cutting edge is based on a single simulation calculation of the wear of the cutting edge during the fine blanking process of the fine blanking die The product of the amount and the average life of the fine blanking die. According to the discriminant criteria of edge deformation, edge internal stress and overall force of the die, calculate the edge deformation, or the internal stress of the edge, or the overall force of the die to determine the edge shape of the fine blanking die during a single fine blanking process Whether to enter a stable state, that is, the deformation of the cutting edge is negligible. The edge shape obtained by superimposing the plastic deformation and wear amount of the fine blanking die edge is the most suitable edge shape for the part. It can be artificially redesigned on the basis of the optimal cutting edge shape as needed.

Table 1 lists the range of threshold values for the optimal edge shape of the fine blanking die under the above-mentioned criteria for edge deformation, internal stress of the edge, and overall force of the die. It should be noted that, for an embodiment, the threshold value is a point value within the range listed in Table 1.

Table 1

Embodiment 1: Execute the process corresponding to the above steps by the finite element software ABAQUS and/or Deform software to control the above execution form of the cutting edge deformation in the above Table 1, the specific process is as follows.

Step 1. Use finite element software to perform a simulation cycle on the fine blanking process of a certain part. The simulation cycle includes the fine blanking process and the springback process of the die to obtain the plastic deformation area of the die edge during the fine blanking process. The shape of the cutting edge is shown in Figure 2.

Step 2, delineate the cutting edge area to be analyzed, which should not only include the plastic deformation area of the cutting edge, but also slightly expand on the basis of the plastic deformation area of the cutting edge, so as to judge accurately.

Step 3, select the method for judging the amount of cutting edge deformation to judge the cutting edge shape of the cutting edge area to be analyzed. The cutting edge area to be analyzed is projected on a Cartesian coordinate grid, the number of grid nodes in the cutting edge area to be analyzed is 18, and the grid nodes are derived from the finite element software, their node numbers and The coordinates are as described in Table 2:

Table 2

Step 4: Calculate the deformation D _{i,1 of node i at the cutting edge in the latest simulation cycle,} the average deformation D ₁ of the cutting edge, and the variance of the cutting edge deformation through the following model

After calculation, the specific data are: D _i,1 is as described in Table 3, D ₁ =7.7 μm;

table 3

Select and judge D ₀ =0.85μm according to the actual situation, Discrimination "D _n < D ₀ , and /> ” is not established, then take the cutting edge shape at this time as the new initial die cutting edge shape, return to step 1, and repeat steps 1 to 3, and so on, calculate the fine blanking process for many times, and update the cutting edge shape continuously until The updated edge shape meets the criteria.

After 6 simulations, the deformation amount D _i,6 of node i at the cutting edge in the simulation cycle is shown in Table 4, the average deformation of the cutting edge D ₆ =0.84μm, and the variance of the cutting edge deformation If it meets the criterion of edge deformation, it is judged that the edge shape at this time is the optimal mold edge shape most suitable for the part.

Table 4

Step 5, on the basis of the deformation of the die edge after the sixth plastic deformation, use the finite element software and the following wear model to calculate the wear of the die edge:

Among them, W is the amount of wear, K is the wear coefficient of the material, S is the average life of the mold, P is the contact stress, v is the sliding speed, and H is the Rockwell hardness of the material; the calculation of the wear of the cutting edge of the mold is based on the average life of the mold and The result of multiplication of single fine blanking and wear results in a new cutting edge shape, as shown in Figure 3.

If you are still unsatisfied with the shape of the cutting edge determined by the above method, you can redesign the optimal mold cutting edge shape according to the specific working conditions. High similarity of calculation results, smooth transition of cutting edge shape and other requirements. After redesigning the optimal mold cutting edge shape, you can return to step 1 and judge through this method again.

Embodiment 2: The process corresponding to the above steps is executed by the finite element software ABAQUS and/or Deform software to control the above execution form of the cutting edge deformation in the above Table 1, and the specific process is as follows.

Step 1. Use finite element software to perform a simulation cycle on the fine blanking process of a certain part. The simulation cycle includes the fine blanking process and the springback process of the die to obtain the plastic deformation area of the die edge during the fine blanking process. The shape of the cutting edge is shown in Figure 2.

Step 2, delineate the cutting edge area to be analyzed, which should not only include the plastic deformation area of the cutting edge, but also slightly expand on the basis of the plastic deformation area of the cutting edge, so as to judge accurately.

Step 3, select the edge internal stress discrimination method to determine the edge shape of the edge area to be analyzed.

Step 4. Obtain the maximum value of the mises equivalent stress P _1,max on the cutting edge during the latest simulation cycle from the simulation results. The specific data is: P _1,max = 3051.15MPa;

Select and judge P ₀ = 2200MPa according to the actual situation; judge that "P _1,max <P ₀ "is not established, then use the cutting edge shape at this time as the new initial mold cutting edge shape, return to step 1, and repeat steps 1~3 , and so on, calculate multiple fine blanking processes, and continuously update the initial die edge shape until the updated edge shape meets the criteria.

After 6 simulations, the internal stress P _{n,max of} the cutting edge in the simulation cycle is shown in Table 5, and the internal stress P _6,max of the cutting edge is 2177.55MPa, which meets the criteria for determining the internal stress of the cutting edge. The optimum die edge shape for the part.

table 5

Step 5, on the basis of the deformation of the die edge after the sixth plastic deformation, use the finite element software and the following wear model to calculate the wear of the die edge:

Among them, W is the amount of wear, K is the wear coefficient of the material, S is the average life of the mold, P is the contact stress, v is the sliding speed, and H is the Rockwell hardness of the material; the calculation of the wear of the cutting edge of the mold is based on the average life of the mold and The result of multiplication of single fine blanking and wear results in a new cutting edge shape, as shown in Figure 3.

If you are still unsatisfied with the shape of the cutting edge determined by the above method, you can redesign the optimal mold cutting edge shape according to the specific working conditions. High similarity of calculation results, smooth transition of cutting edge shape and other requirements. After redesigning the optimal mold cutting edge shape, you can return to step 1 and judge through this method again.

Embodiment 3: Execute the process corresponding to the above steps through the finite element software ABAQUS and/or Deform software to control the above execution form of the cutting edge deformation in the above Table 1, the specific process is as follows.

Step 1. Use finite element software to perform a simulation cycle on the fine blanking process of a certain part. The simulation cycle includes the fine blanking process and the springback process of the die to obtain the plastic deformation area of the die edge during the fine blanking process. The shape of the cutting edge is shown in Figure 2.

Step 2, delineate the cutting edge area to be analyzed, which should not only include the plastic deformation area of the cutting edge, but also slightly expand on the basis of the plastic deformation area of the cutting edge, so as to judge accurately.

Step 3, select the overall force judgment method of the mold to judge the cutting edge shape of the cutting edge area to be analyzed.

Step 4, calculate the maximum overall force F _1,max of the mold in the latest simulation cycle through the following model, and count the maximum overall force F _max of the mold obtained in the simulation results so far; the specific data is: F _1,max =636.28kN; F _max =636.28kN.

Select and judge a=0.7 according to the actual situation; judge whether "F _1,max /F _max <a" is true, if not, use the cutting edge shape at this time as the new initial mold cutting edge shape, return to step 1, and Repeat steps 1 to 3, such a cycle, calculate the fine blanking process for many times, and continuously update the shape of the cutting edge until the updated shape of the cutting edge meets the discrimination standard.

After 6 simulations, the overall force F _{n,max of} the mold in the simulation cycle is shown in Table 6, F _1,max /F _max = 0.68, which meets the criterion for the deformation of the cutting edge, and the shape of the cutting edge at this time is judged is the optimal die edge shape most suitable for the part.

Table 6

Step 5, on the basis of the deformation of the die edge after the sixth plastic deformation, use the finite element software and the following wear model to calculate the wear of the die edge:

Among them, W is the amount of wear, K is the wear coefficient of the material, S is the average life of the mold, P is the contact stress, v is the sliding speed, and H is the Rockwell hardness of the material; the calculation of the wear of the cutting edge of the mold is based on the average life of the mold and The result of multiplication of single fine blanking and wear results in a new cutting edge shape, as shown in Figure 3.

If you are still unsatisfied with the shape of the cutting edge determined by the above method, you can redesign the optimal mold cutting edge shape according to the specific working conditions. High similarity of calculation results, smooth transition of cutting edge shape and other requirements. After redesigning the optimal mold cutting edge shape, you can return to step 1 and judge through this method again.

The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (10)

1. A judging method of the optimal cutting edge shape of a fine blanking die comprises the following steps:

step 1, aiming at the shape of the cutting edge of an initial die set for a certain part, carrying out 1 simulation cycle on the fine blanking process of the part to obtain a region where plastic deformation occurs on the cutting edge of the die in the fine blanking process, wherein the plastic deformation occurs on the cutting edge to cause the shape of the cutting edge to change, and calculating the plastic deformation accumulation of the cutting edge in the fine blanking process of the fine blanking die;

step 2, determining a cutting edge area to be analyzed, wherein the cutting edge area to be analyzed comprises the area subjected to plastic deformation and an area extending to the periphery of the area subjected to plastic deformation;

step 3, judging the cutting edge shape of the cutting edge area to be analyzed by selecting at least one of the following judging methods to judge whether the cutting edge shape of the fine blanking die enters a stable state or not: the cutting edge deformation judging method is used for indicating whether the deformation of the cutting edge area to be analyzed is lower than the judging standard of the cutting edge deformation or not, the cutting edge internal stress judging method is used for indicating whether the maximum stress of the cutting edge area to be analyzed is lower than the judging standard of the stress or not, the judging standard of the stress is between the yield strength and the tensile strength of a die material, and the die integral stress judging method is used for indicating whether the ratio of the die integral stress maximum value in the current simulation cycle to the die integral stress maximum value in the current and all previous simulation cycles reaches the descending proportion standard value of the die integral stress maximum value or not;

step 4, if the judging result in the step 3 is satisfied, judging that the cutting edge shape at the moment is the optimal die cutting edge shape; otherwise, taking the cutting edge shape at the moment as a new initial die cutting edge shape, and returning to the step 1; and (3) circularly executing the steps 1 to 4 for a plurality of times, so that the optimal die cutting edge shape is the cutting edge shape which is gradually stable after a plurality of times of continuous fine blanking processing.

2. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: the simulation cycle includes a fine blanking process and a die rebound process.

3. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: the cutting edge deformation quantity judging method comprises the steps of,

step 3.1.1, projecting the cutting edge area to be analyzed on a rectangular coordinate grid to enable grid nodes i in the cutting edge area to be analyzed _m The number is m, and the coordinates are i in turn ₁ （x ₁ ，y ₁ ，z ₁ ）、i ₂ （x ₂ ，y ₂ ，z ₂ ）……i _m （x _m ，y _m ，z _m ）；

Step 3.1.2, calculating the deformation of the node i of the cutting edge part in the latest simulation cycle in sequenceAverage deformation amount of edge part->And variance of edge deformation +.>：

；

；

；

Wherein n represents the current total analog cycle number; m represents the number of nodes of the cutting edge part of the fine blanking die in the current research;respectively representing the deformation of the 1 st cutting edge node and the 2 nd cutting edge node … … m cutting edge node under the nth simulation cycle; />Is->Mean value of->Is->Is a variance of (2);

step 3.1.3, judging'< />And->< />Whether the cutting edge shape is established or not is judged, if yes, the cutting edge shape meets the judging standard in the judging method, namely, the updated cutting edge shape of the die is obtained after the influence of plastic deformation is obtained preliminarily; if not, judging that the cutting edge shape does not meet the judgment standard in the judgment method; wherein (1)>Is a judging standard value of the average value of the deformation of the cutting edge node, < + >>And the judgment standard value of the variance of the deformation of the cutting edge node is obtained.

4. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: the method for judging the maximum internal stress of the cutting edge comprises the steps of,

step 3.2.1 from the simulated junctionObtaining the maximum value of mises equivalent stress born by the cutting edge part in the latest simulation cycle processWherein n represents the current total analog cycle number;

step 3.2.2, judge'< P ₀ Whether the cutting edge shape is established or not is judged, if yes, the cutting edge shape is judged to meet the judgment standard in the judgment method; if not, judging that the cutting edge shape does not meet the judgment standard in the judgment method; wherein P is ₀ Is a standard value for judging stress.

5. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: the method for discriminating the overall stress of the die comprises the steps of,

step 3.3.1, obtaining the maximum value of the integral stress of the die in the latest simulation cycle process from the simulation resultAnd counting the maximum overall stress of the die obtained in the simulation results so far>Wherein n represents the current total analog cycle number;

step 3.3.2, judge'<a' is established, if yes, the cutting edge shape is judged to meet the judgment standard in the judgment method; if not, judging that the cutting edge shape does not meet the judgment standard in the judgment method; wherein a is the reduction reaching standard value which needs to be met by the maximum stress value of the whole die.

6. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: and 5, calculating the abrasion of the cutting edge of the die, and calculating the abrasion condition of the cutting edge of the die by using finite element software and the following abrasion model:

，

wherein,,for the amount of wear>For the wear coefficient of the material->For the average life of the mould>For contact stress->For the sliding speed +.>Is the Rockwell hardness of the material.

7. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 6, wherein: and step 6, after the step 5, redesigning the obtained optimal die cutting edge shape.

8. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 7, wherein: and (3) after redesigning the shape of the cutting edge of the optimal die, returning to the step (1).

9. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 1, wherein the method comprises the following steps: the simulation cycle is implemented using finite element software in which the mold is set to be a plastic body.

10. The method for determining the optimal cutting edge shape of the fine blanking die according to claim 9, wherein: the finite element software includes Abaqus and/or form.