A flexible electromagnetic progressive shape correction method for continuous large skin contour peak height defects

Abstract

The application discloses a flexible electromagnetic progressive correction method for a skin continuous large-profile peak high defect, constructs a deformation prediction model of a large-profile peak high of an electromagnetic correction skin, and determines the influence of material flow on deformation of adjacent correction areas in the correction process of the continuous large-profile peak high skin sheet metal part, so that the electromagnetic forming force caused by excessive electromagnetic forming force is avoided to cause the electromagnetic correction critical angle of the adjacent correction area to be out of tolerance, and meanwhile, the application restricts the influence of the electromagnetic correction of the protruding area on the deformation of the adjacent protruding area, optimizes the electromagnetic correction times and the single electromagnetic correction force, realizes the automatic correction of the continuous large-profile peak high skin sheet metal part, and improves the efficiency and reduces the labor cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electromagnetic sheet metal forming, and particularly relates to a flexible electromagnetic progressive shape correction method for skin continuous large profile peak high defects. BACKGROUND

[0002] Under artificial operation conditions, electromagnetic force is applied to the skin, and the skin is deformed by the electromagnetic force, so that the skin continuous large profile peak high defects can be corrected. However, in the existing skin electromagnetic correction process, the deformation amount of the skin under the influence of different electromagnetic forces and the posture after electromagnetic deformation cannot be predicted, so the electromagnetic force applied to the skin can only rely on the experience of artificial operation, and after each electromagnetic force is applied, the posture of the skin after deformation needs to be measured again, and then the electromagnetic force parameters applied to the skin next time are estimated again based on the measurement results. This results in that the existing skin electromagnetic correction process and the experience of the operator are relied on, and whether the electromagnetic force applied in the skin electromagnetic correction process is appropriate and whether the deformation amount of the skin meets the expectation are difficult to predict, so the processing efficiency of the skin correction is greatly affected, and the skin may be cracked, wrinkled and uneven in thickness due to the inappropriate electromagnetic force parameters.

[0003] Therefore, in view of the above problems existing in the existing electromagnetic correction of the skin continuous large profile peak high defect area, the application discloses a flexible electromagnetic progressive shape correction method for skin continuous large profile peak high defects. SUMMARY

[0004] The application discloses a flexible electromagnetic progressive shape correction method for skin continuous large profile peak high defects, which can accurately determine the deformation amount, posture and influence relationship of adjacent deformation regions of the skin after the skin is stressed in the skin electromagnetic correction process, and optimize the best electromagnetic correction force and processing mode, so as to meet the high-quality and efficient forming requirement and reduce the influence of wrinkles, uneven thickness and the like after correction on the forming quality.

[0005] The application is implemented through the following technical scheme:

[0006] A flexible electromagnetic progressive correction method for continuous large-profile peak height defects in skin is established. A deformation prediction model for electromagnetic correction of large-profile peak height defects in skin is established. The deformation prediction model is used to characterize the influence of material flow caused by continuous large-profile peak height defects in skin sheet metal parts during electromagnetic correction on the deformation of adjacent correction areas. The skin surface function corresponding to electromagnetic forces of different sizes acting on the raised areas of the skin is solved based on the deformation prediction model, and a mold surface function is established. The correction points of the skin in different raised areas are solved based on the skin surface function and the mold surface function. Electromagnetic correction forces are applied at the correction points, and the deformation prediction model is used to predict the optimal influence of the electromagnetic correction force applied at the current correction point on the deformation of the adjacent correction areas. The electromagnetic correction force corresponding to the optimal influence is input into the deformation prediction model for iterative optimization until the distance between the skin and the mold is equal to the thickness of the skin, and the optimal electromagnetic correction force for each correction area is output.

[0007] In order to better implement the present invention, the following steps are further specifically included:

[0008] Step 1: Establish a number of skin feature points on the skin, and based on the electromagnetic correction parameters at the skin feature points, establish the force deformation and deformation constraint conditions of the skin feature points to obtain a deformation prediction model;

[0009] Step 2: Input different electromagnetic correction parameters into the deformation prediction model to obtain the corresponding skin surface function when electromagnetic forces of different magnitudes act on the raised area of ​​the skin;

[0010] Step 3: Establish several mold feature points on the skin mold, and obtain the mold surface function based on the mold feature points;

[0011] Step 4: Solve the correction points of the skin in different raised areas based on the skin surface function and the mold surface function. The correction points include the contact points between the skin and the mold and the highest points of the skin raised areas. The correction angles of any two adjacent raised areas are established based on the contact points and the highest points.

[0012] Step 5: Apply an electromagnetic shaping force at the highest point of any raised area, and use the deformation prediction model to predict the electromagnetic shaping force corresponding to the moment when the deformation of the adjacent raised area reaches the critical value of the shaping angle when the electromagnetic shaping force is applied at the current highest point. This is used as one of the shaping parameters and input into the deformation prediction model.

[0013] Step 6: Repeat steps 2 to 5 alternately in different adjacent raised areas until the distance between the highest point of the raised area and the mold is equal to the thickness of the skin. Output the electromagnetic shaping force applied to the raised area at this time as the optimal electromagnetic shaping force.

[0014] In order to better implement the present invention, further, establishing a deformation prediction model includes the following steps:

[0015] Step A1, establishing S skin feature points on the skin based on the global coordinate system, and establishing a skin local coordinate system relative to the global coordinate system in the cutting direction of any skin feature point;

[0016] Step A2, establishing a force relationship function between two adjacent skin feature points;

[0017] Step A3, establishing a deformation relationship function between the electromagnetic shaping parameter at any skin feature point and the force deformation amount;

[0018] Step A4, establishing a deformation amount constraint condition function of the skin feature point;

[0019] Step A5, the force relationship function, the deformation relationship function, and the deformation amount constraint condition function are solved to obtain a deformation prediction model.

[0020] In order to better realize the present application, further, the force relationship function in step A2 is as follows:

[0021] ;

[0022] Wherein: represents the deflection angle of the skin local coordinate system relative to the global coordinate system; represents the deformation amount of the skin along the X t direction of the skin local coordinate system; represents the deformation amount of the skin along the Y t direction of the skin local coordinate system; represents the radial force received by the s-th skin feature point; represents the tangential force received by the s-th skin feature point; represents the bending moment received by the s-th skin feature point; represents the radial force received by the first skin feature point; represents the tangential force received by the first skin feature point; represents the bending moment received by the first skin feature point; k represents the curvature of the skin.

[0023] In order to better realize the present application, further, the deformation relationship function in step A3 is as follows:

[0024]

[0025] Wherein: represents the radial force received by the t-th skin feature point, t≤s; represents the tangential force received by the t-th skin feature point; represents the bending moment received by the t-th skin feature point; denotes the X direction deformation variable of the skin along the local coordinate system of the skin t denotes the X direction deformation variable of the skin along the global coordinate system denotes the Y direction deformation variable of the skin along the local coordinate system of the skin t denotes the Y direction deformation variable of the skin along the global coordinate system denotes the angle between the tangent of the arbitrary skin feature point and the tangent force; k denotes the curvature of the skin.

[0026] In order to better realize the present application, further, the deformation variable constraint function in step A4 is as follows:

[0027] ;

[0028] Wherein: S denotes s skin feature points; t denotes the tth skin feature point, t≤s; denotes the X direction deformation variable of the skin along the global coordinate system t denotes the X direction deformation variable of the skin along the global coordinate system denotes the Y direction deformation variable of the skin along the global coordinate system t denotes the Y direction deformation variable of the skin along the global coordinate system denotes the deformation variable of the tangent direction at the tth skin feature point; denotes the deformation variable of the normal direction at the tth skin feature point; k denotes the curvature of the skin. denotes the angle between the tangent direction of the arbitrary skin feature point and the horizontal direction; denotes the angle between the tangent direction of the arbitrary skin feature point and the horizontal direction; k denotes the curvature of the skin.

[0029] In order to better realize the present application, further, the formula for solving the contact point between the skin and the mold in step 4 is as follows:

[0030] F s (x, y) = F m (x, y);

[0031] At least three contact points between the skin and the mold are calculated based on the formula of the contact point: 、 、 ;

[0032] Wherein: F s (x, y) denotes the skin surface function; F m (x, y) denotes the mold surface function; denotes the coordinates of the contact point A; denotes the coordinates of the contact point C; denotes the coordinates of the contact point E.

[0033] In order to better realize the present application, further, the formula for solving the highest point between the skin and the mold in step 4 is as follows:

[0034] ;

[0035] ;

[0036] The highest point of any two adjacent convex regions between the skin and the mold is calculated by the formula based on the highest point as follows: , ;

[0037] Wherein: Fs (x, y) represents the skin surface function; Fm (x, y) represents the mold surface function; represents the coordinates of the highest point B of the first convex region; represents the coordinates of the highest point D of the second convex region.

[0038] In order to better realize the present application, further, the calculation formula of the shape correction angle of any two adjacent convex regions is as follows:

[0039] ;

[0040] ;

[0041] Wherein: represents the shape correction angle of the first convex region; represents the shape correction angle of the second convex region; represents the horizontal coordinate of the contact point A; represents the vertical coordinate of the contact point A; represents the horizontal coordinate of the highest point B; represents the vertical coordinate of the highest point B; represents the horizontal coordinate of the contact point C; represents the vertical coordinate of the contact point C; represents the horizontal coordinate of the highest point D; represents the vertical coordinate of the highest point D; represents the horizontal coordinate of the contact point E; represents the vertical coordinate of the contact point E.

[0042] In order to better realize the present application, further, the shape correction angle critical value is 85°.

[0043] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0044] The present application constructs a deformation prediction model of the large profile peak height of the electromagnetic calibration skin, and determines the influence of the material flow in the calibration process of the continuous large profile peak height skin sheet metal part on the deformation of the adjacent calibration area, thereby avoiding the excessive electromagnetic forming force to cause the adjacent electromagnetic calibration critical angle of the calibration area to be out of tolerance, and the present application optimizes the electromagnetic calibration times and the single electromagnetic calibration force by restraining the influence of the electromagnetic calibration of the convex area on the deformation of the adjacent convex area, realizes the automatic calibration of the continuous large profile peak height skin sheet metal part, improves the efficiency, and reduces the labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 The flowchart of the method of the present application is shown in the figure;

[0046] Figure 2 The schematic diagram of the electromagnetic calibration force applied to the first convex area is shown in the figure;

[0047] Figure 3 The schematic diagram of the electromagnetic calibration force applied to the second convex area is shown in the figure;

[0048] Figure 4 The schematic diagram of the calibration angle of the first convex area reaching the critical value is shown in the figure;

[0049] Figure 5 The schematic diagram of the calibration of the first convex area is shown in the figure;

[0050] Figure 6 The schematic diagram of the calibration of the first and second convex areas is shown in the figure;

[0051] Figure 7 The schematic diagram of the local coordinate system of the skin is shown in the figure;

[0052] Figure 8 The schematic diagram of the calibration parameter at the feature point of the skin is shown in the figure. DETAILED DESCRIPTION

[0053] Example 1:

[0054] The skin continuous large contour peak height defect flexible electromagnetic progressive correction method of the embodiment, a deformation prediction model of the electromagnetic correction skin large contour peak height defect is established, and the deformation prediction model is used to represent the influence degree of the material flow of the skin sheet metal part continuous large contour peak height defect in the electromagnetic correction process on the deformation of the adjacent correction area; based on the deformation prediction model, the corresponding skin surface function of the electromagnetic force of different sizes acting on the convex area of the skin is calculated, the mold surface function is established, the correction points of the skin in different convex areas are calculated based on the skin surface function and the mold surface function, the electromagnetic correction force is applied at the correction points, and the optimal influence degree of the electromagnetic correction force applied at the current correction point on the adjacent correction area deformation is predicted through the deformation prediction model, the electromagnetic correction force corresponding to the optimal influence degree is input into the deformation prediction model for iterative optimization, and the optimal electromagnetic correction force of each correction area is output when the distance between the skin and the mold is equal to the thickness of the skin.

[0055] As shown in Figure 1 , specifically comprising the following steps:

[0056] Step 1, a plurality of skin feature points are established on the skin, the stress deformation of the skin feature points is established based on the electromagnetic correction parameters at the skin feature points, and the deformation prediction model is obtained based on the deformation constraint condition;

[0057] Step 2, different electromagnetic correction parameters are input into the deformation prediction model, and the corresponding skin surface function of the electromagnetic force of different sizes acting on the convex area of the skin is fitted;

[0058] Step 3, a plurality of mold feature points are established on the skin mold, and the mold surface function is fitted based on the mold feature points;

[0059] Step 4, the correction points of the skin in different convex areas are calculated based on the skin surface function and the mold surface function, the correction points include the contact points between the skin and the mold and the highest points of the convex area of the skin, and the correction angles of any two adjacent convex areas are established based on the contact points and the highest points;

[0060] Step 5, the electromagnetic correction force is applied at the highest point of any convex area, and the electromagnetic correction force corresponding to the critical value of the correction angle of the adjacent convex area when the deformation reaches the correction angle is input into the deformation prediction model as one of the correction parameters through the deformation prediction model when the electromagnetic correction force is applied at the current highest point;

[0061] Step 6, steps 2-5 are repeatedly iterated in different adjacent convex areas, as shown in Figures 2-6 , until the distance between the highest point of the convex area and the mold is equal to the thickness of the skin, and the electromagnetic correction force applied by the convex area at this time is output as the optimal electromagnetic correction force.

[0062] Embodiment 2:

[0063] This embodiment further optimizes the above embodiment 1, and establishes a deformation prediction model including the following steps:

[0064] Step A1: establishing S skin feature points on the skin based on the global coordinate system, and establishing a skin local coordinate system relative to the global coordinate system in the cutting direction of any skin feature point;

[0065] Step A2: establishing a force relationship function between two adjacent skin feature points;

[0066] Step A3: establishing a deformation relationship function between the electromagnetic correction parameters and the force deformation at any skin feature point;

[0067] Step A4: establishing a deformation constraint function of the skin feature points;

[0068] Step A5: The deformation prediction model can be obtained by simultaneously combining the force relationship function, the deformation relationship function, and the deformation constraint condition function.

[0069] The force relationship function in step A2 is as follows:

[0070] ;

[0071] in: Indicates the deflection angle of the skin local coordinate system relative to the global coordinate system; Indicates the X coordinate of the skin along the global coordinate system t Directional deformation; Indicates the Y coordinate of the skin along the global coordinate system t Directional deformation; Indicates the radial force on the sth skin feature point; Indicates the tangential force on the s-th skin feature point; represents the bending moment of the sth skin feature point; Indicates the radial force acting on the first skin feature point; Indicates the tangential force on the first skin feature point; represents the bending moment of the first skin feature point; k represents the skin curvature.

[0072] The deformation relationship function in step A3 is as follows:

[0073]

[0074] in: Indicates the radial force on the t-th skin feature point, t≤s; Indicates the tangential force on the t-th skin feature point; M , t represents the bending moment of the tth skin feature point. t direction deformation variable. , t represents the bending moment of the tth skin feature point. t direction deformation variable. , k represents the curvature of the skin.

[0075] The deformation constraint function in step A4 is as follows:

[0076] ;

[0077] Wherein: S represents s skin feature points; t represents the tth skin feature point, t≤s; , t represents the bending moment of the tth skin feature point. t direction deformation variable. , t represents the bending moment of the tth skin feature point. t direction deformation variable. , t represents the deformation of the tth skin feature point in the tangent direction. , t represents the deformation of the tth skin feature point in the normal direction; k represents the curvature of the skin. β t , t represents the angle between the tangent direction of the tth skin feature point and the horizontal direction. , k represents the curvature of the skin.

[0078] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1, and will not be described again.

[0079] Embodiment 3:

[0080] This embodiment is further optimized on the basis of the above-mentioned embodiments 1 or 2, and the formula for solving the contact points between the skin and the mold in step 4 is as follows:

[0081] F s (x, y) = F m (x, y);

[0082] As shown in the formula for calculating the contact points between the skin and the mold based on the contact points: Figures 2-6 , , , ;

[0083] Wherein: F s (x, y) represents the skin surface function; F m (x, y) represents the mold surface function. represents the coordinates of the contact point A. coordinates of the contact point C; coordinates of the contact point E.

[0084] In step 4, the formula for solving the highest point between the skin and the mold is as follows:

[0085] ;

[0086] ;

[0087] The highest point between any two adjacent convex regions of the skin and the mold is calculated based on the formula of the highest point: , ;

[0088] Wherein: F s (x, y) represents the skin surface function; F m (x, y) represents the mold surface function; coordinates of the highest point B of the first convex region; coordinates of the highest point D of the second convex region.

[0089] The calculation formula of the alignment angle of any two adjacent convex regions is as follows:

[0090] ;

[0091] ;

[0092] Wherein: the alignment angle of the first convex region; the alignment angle of the second convex region; the horizontal coordinate of the contact point A; the vertical coordinate of the contact point A; the horizontal coordinate of the highest point B; the vertical coordinate of the highest point B; the horizontal coordinate of the contact point C; the vertical coordinate of the contact point C; the horizontal coordinate of the highest point D; the vertical coordinate of the highest point D; the horizontal coordinate of the contact point E; the vertical coordinate of the contact point E.

[0093] Further, the alignment angle critical value is 85°

[0094] Example 4:

[0095] The embodiment is further optimized on the basis of any one of the above embodiments 1-3, S skin feature points are established on the skin, as shown in Figure 7 The skin local coordinate system O t is established in the cutting direction of any skin feature point relative to the global coordinate system O t , is the deflection angle of the skin local coordinate system O xy relative to the global coordinate system O t , t is the deflection angle of the skin local coordinate system O t , is the deflection angle of the skin local coordinate system O t , , β t is the deflection angle of the skin local coordinate system O is the deflection angle of the skin local coordinate system O

[0096] As shown in Figure 8 , F t represents the radial force on the skin feature point, P t represents the tangential force on the skin feature point, and M t represents the bending moment on the skin feature point.

[0097] Let R be the radius of the skin, L be the length of the skin, and k be the curvature, then:

[0098] ;

[0099] The first step is to construct the force relationship function between the s-1th skin feature point and the s th skin feature point as follows:

[0100] ;

[0101] The second step is to construct the deformation relationship function between the electromagnetic shaping parameters at the skin feature point and the deformation amount as follows:

[0102]

[0103] The third step is to establish the deformation amount constraint function of the skin feature point as follows:

[0104] ;

[0105] The force relationship function, the deformation relationship function, and the deformation amount constraint function are solved simultaneously, and the F t , P t , M t , x t , y t , Any three parameters can be solved to solve the other three parameters.

[0106] Optimization of the best electromagnetic shaping force and processing method:

[0107] By restricting the convex area electromagnetic shaping after the influence of the deformation of the adjacent convex area, the shaping angle of the adjacent convex area needs to be greater than or equal to 85°, as shown in the figure, that is, it needs to meet ≥85°、 ≥85°, optimize the number of electromagnetic shaping and the single electromagnetic shaping force, the optimization of the best electromagnetic shaping force and processing method is as follows:

[0108] Through the deformation prediction model of the electromagnetic shaping skin large contour peak high defect, the deformation prediction model is known F t , P t , M t , x t , y t , , solve the coordinates of any skin feature points in the global coordinate system after the first convex area is acted on by electromagnetic force of different sizes, and then fit different skin surface functions F s (x, y) formed by different electromagnetic forces. A number of mold feature points are established on the skin mold, and the mold surface function F m (x, y) is fitted based on the mold feature points.

[0109] Solve the contact points A, C, E and the highest points B, D by combining different skin surface functions F s (x, y) and mold surface functions F m (x, y).

[0110] When <85°, the electromagnetic force is too large to meet the demand; solve decreases to approach 85°, and the optimal electromagnetic shaping force F 1max of the first convex area;

[0111] Repeat the above steps when <85°, the electromagnetic force is too large to meet the demand; solve decreases to approach 85°, and the optimal electromagnetic shaping force F 2max of the second convex area;

[0112] Iterate the above steps until the distance between the highest point of the skin and the mold is equal to the thickness of the skin.

[0113] The specific calculation process is as follows:

[0114] 1: flag = 1;

[0115] 2: while flag = 1;

[0116] 3: for F t =F rmin :5:F rmax (F rmin , F rmax ) represent the minimum and maximum electromagnetic force required for different materials and shapes of the correction);

[0117] 4: input P t , M t ;

[0118] 5: solve x t , y t , parameters according to the electromagnetic correction skin large contour peak height deformation prediction model;

[0119] 6: obtain the skin surface function F s (x, y) according to x t , y t , ;

[0120] 7: obtain the mold surface function F m (x, y) according to the mold feature point position coordinates;

[0121] 8: establish the relationship F s (x, y) = F m (x, y), and solve the contact point , , ;

[0122] 9: establish the equation and to obtain the highest point , ;

[0123] 10: ;

[0124] that is ;

[0125] 11: ;

[0126] 12: output the first convex region first time to apply the optimal electromagnetic correction force F 1max ;

[0127] 13: end

[0128] 14: end

[0129] 15: for F t = F rmin :5:Frmax ;

[0130] 16: input P t , M t ;

[0131] 17: solve x t , y t , parameters according to the electromagnetic calibration skin large profile peak height deformation prediction model;

[0132] 18: get the skin surface function F t (x, y) according to x t , y s , fitting;

[0133] 19: get the mold surface function F m (x, y) according to the mold feature point position coordinates fitting;

[0134] 20: establish F s (x, y) = F m (x, y) relationship, find out the contact point ;

[0135] 21: establish equation and get the highest point ;

[0136] 22: ;

[0137] that is ;

[0138] 23: if ;

[0139] 24: output the first convex region first time to apply the optimal electromagnetic calibration force F 2max ;

[0140] 25: end

[0141] 26: end

[0142] 27: judge whether the highest point of the skin , and the distance between the mold F m (x, y) is equal to the skin thickness;

[0143] 28: if equal, flag = 0, stop the loop;

[0144] 29: end

[0145] 30: end

[0146] 31: output the first convex region optimal electromagnetic straightening force F 1max and the second convex region optimal electromagnetic straightening force F 2max .

[0147] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change of the above embodiment according to the technical essence of the present application falls within the protection scope of the present application.

Claims

1. A flexible electromagnetic progressive correction method for continuous large-profile peak height defects in skin, characterized by: A deformation prediction model for continuous large contour peak height defects in the skin is established, and the deformation prediction model is used to characterize the influence of material flow caused by continuous large contour peak height defects in the skin during the electromagnetic correction process on the deformation of adjacent correction areas; based on the deformation prediction model, the corresponding skin surface function when electromagnetic forces of different sizes act on the convex area of ​​the skin is solved, and a mold surface function is established. Based on the skin surface function and the mold surface function, the correction points of the skin in different convex areas are solved, and electromagnetic correction forces are applied at the correction points. The deformation prediction model is used to predict the optimal influence of the electromagnetic correction force applied at the current correction point on the deformation of the adjacent correction areas, and the electromagnetic correction force corresponding to the optimal influence is input into the deformation prediction model for iterative optimization until the distance between the skin and the mold is equal to the thickness of the skin, and the optimal electromagnetic correction force for each correction area is output; specifically, the following steps are included: Step 1: Establish a number of skin feature points on the skin, and based on the electromagnetic correction parameters at the skin feature points, establish the force deformation and deformation constraint conditions of the skin feature points to obtain a deformation prediction model; Step 2: Input different electromagnetic correction parameters into the deformation prediction model to obtain the corresponding skin surface function when electromagnetic forces of different magnitudes act on the convex area of ​​the skin; Step 3: Establish several mold feature points on the skin mold, and obtain the mold surface function based on the mold feature points; Step 4: Solve the correction points of the skin in different raised areas based on the skin surface function and the mold surface function. The correction points include the contact points between the skin and the mold and the highest points of the skin raised areas. The correction angles of any two adjacent raised areas are established based on the contact points and the highest points. Step 5: Apply an electromagnetic shaping force at the highest point of any raised area, and use the deformation prediction model to predict the electromagnetic shaping force corresponding to the moment when the deformation of the adjacent raised area reaches the critical value of the shaping angle when the electromagnetic shaping force is applied at the current highest point. This is used as one of the shaping parameters and input into the deformation prediction model. Step 6: Repeat steps 2 to 5 alternately in different adjacent raised areas until the distance between the highest point of the raised area and the mold is equal to the thickness of the skin. Output the electromagnetic shaping force applied to the raised area at this time as the optimal electromagnetic shaping force.

2. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 1 is characterized in that: Establishing a deformation prediction model includes the following steps: Step A1: establishing S skin feature points on the skin based on the global coordinate system, and establishing a skin local coordinate system relative to the global coordinate system in the cutting direction of any skin feature point; Step A2: establishing a force relationship function between two adjacent skin feature points; Step A3: establishing a deformation relationship function between the electromagnetic correction parameters and the force deformation at any skin feature point; Step A4: establishing a deformation constraint function of the skin feature points; Step A5: Simultaneously combine the force relationship function, the deformation relationship function, and the deformation constraint condition function to obtain a deformation prediction model.

3. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 2 is characterized in that: The force relationship function in step A2 is as follows: ； in: Indicates the deflection angle of the skin local coordinate system relative to the global coordinate system; The X coordinate of the skin along the skin local coordinate system t Directional deformation; Indicates the Y coordinate of the skin along the skin local coordinate system t Directional deformation; Indicates the radial force on the sth skin feature point; Indicates the tangential force on the s-th skin feature point; represents the bending moment of the sth skin feature point; Indicates the radial force acting on the first skin feature point; Indicates the tangential force on the first skin feature point; represents the bending moment of the first skin feature point; k represents the skin curvature.

4. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 3 is characterized in that: The deformation relationship function in step A3 is as follows: in: Indicates the radial force on the t-th skin feature point, t≤s; Indicates the tangential force on the t-th skin feature point; represents the bending moment of the tth skin feature point; The X coordinate of the skin along the skin local coordinate system t Directional deformation; Indicates the Y coordinate of the skin along the skin local coordinate system t Directional deformation; It represents the angle between the tangent line and the tangential force at any skin feature point; k represents the curvature of the skin.

5. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 4 is characterized in that: The deformation constraint function in step A4 is as follows: ； Where: S represents s skin feature points; t represents the t-th skin feature point, t≤s; Indicates the X coordinate of the skin along the global coordinate system t Directional deformation; Indicates the Y coordinate of the skin along the global coordinate system t Directional deformation; Indicates the deformation in the tangential direction at the t-th skin feature point; represents the deformation in the normal direction at the tth skin feature point; k represents the curvature of the skin; Represents the angle between the tangent direction of any skin feature point and the horizontal direction; It represents the deflection angle of the skin's local coordinate system relative to the global coordinate system; k represents the curvature of the skin.

6. A flexible electromagnetic progressive correction method for continuous large-profile peak height defects of a skin according to any one of claims 1 to 5, characterized in that: In step 4, the formula for solving the contact point between the skin and the mold is as follows: F s (x,y)= F m (x,y); The calculation results show at least three contact points between the skin and the mold as follows: 、 、 ; Among them: F s (x, y) represents the skin surface function; F m (x, y) represents the mold surface function; represents the coordinates of contact point A; represents the coordinates of the contact point C; Represents the coordinates of the contact point E.

7. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 6 is characterized in that: In step 4, the formula for solving the highest point between the skin and the mold is as follows: ； ； The highest points of any two adjacent raised areas between the skin and the mold are calculated as: 、 ; Among them: F s (x, y) represents the skin surface function; F m (x, y) represents the mold surface function; Indicates the coordinates of the highest point B of the first raised area; Indicates the coordinates of the highest point D of the second raised area.

8. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 7 is characterized in that: The calculation formula for the correction angle of any two adjacent convex areas is as follows: ； ； in: Indicates the correction angle of the first raised area; represents the correction angle of the second raised area; represents the abscissa of the contact point A; Indicates the ordinate of contact point A; Indicates the abscissa of the highest point B; Indicates the ordinate of the highest point B; represents the abscissa of the contact point C; represents the ordinate of the contact point C; Indicates the abscissa of the highest point D; Indicates the ordinate of the highest point D; represents the abscissa of the contact point E; Represents the ordinate of the contact point E.

9. The flexible electromagnetic progressive correction method for continuous large-profile peak height defects of skin according to claim 8, characterized in that: The critical value of the correction angle is 85°.

Images