Outer plate material clamping and flanging material clamping force calculation method, electronic equipment, server and storage medium

Abstract

The invention provides an outer plate clamping and flanging clamping force calculation method, electronic equipment, a server and a storage medium. The outer plate clamping and flanging clamping force calculation method comprises the following steps that finite element analysis software is adopted to conduct simulation calculation on clamping force parameters of clamping and flanging based on a clamping and flanging mechanism; material clamping force parameters of material clamping and flanging are set; setting a material clamping force parameter to meet a formula; verifying that the material clamping force parameter meets the formula; and a material clamping force formula is obtained through a pressure formula of a material pressing plate on the outer plate flanging die. The method has the beneficial effects that the material clamping force of material clamping and flanging can be accurately calculated, in addition, the calculation formula is also applied to calculation of the material clamping force of material clamping and flanging of all parts including inner plates, and the applicability of the method is further improved.

Description

Technical Field

[0001] The invention belongs to the field of outer panel clamping and flanging, and in particular relates to an outer panel clamping and flanging clamping force calculation method, electronic equipment, a server and a storage medium. Background Art

[0002] In recent years, the outer panel clamping and flanging mechanism has been widely used in the industry, such as Figure 1 As shown, the clamping and flanging do play an obvious role in controlling the rebound of the entire workpiece after flanging, which is widely recognized in the industry. However, there is no reliable conclusion in the industry on how to choose the clamping force of the lower support core. At present, a reference value has been summarized from practical applications, that is, the clamping force of the lower support core is selected according to 30% of the pressure of the upper pressure core. This is only a reference value. In actual mold debugging, the value is sometimes too large and sometimes too small. A large value causes the clamping force to be too tight, causing the flanging to elongate, and the nitrogen cylinder needs to be disassembled; sometimes it is too small, and the debugging process still causes instability and wrinkling, which does not play the role it should play. In this way, the mold needs to be rectified and a nitrogen spring needs to be added. The present invention provides a reliable theoretical basis for the accurate calculation of the clamping force. Summary of the invention

[0003] In view of this, the present invention aims to provide a method for calculating the clamping force of outer panel clamping and flanging, an electronic device, a server and a storage medium to solve at least one problem existing in the above-mentioned prior art.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A method for calculating the clamping force of outer plate clamping and flanging, comprising the following steps:

[0006] S1. Based on the clamping and flanging mechanism, finite element analysis software is used to simulate and calculate the clamping force parameters of the clamping and flanging;

[0007] S2. Set the clamping force parameters for clamping and flanging;

[0008] S3. Set the clamping force parameters to satisfy the formula;

[0009] S4. Verify that the clamping force parameters satisfy the formula;

[0010] S5. The clamping force formula is obtained through the pressure formula of the pressing plate on the outer panel flanging die.

[0011] Furthermore, in step S1, the clamping and flanging mechanism includes an upper mold, a lower mold, a flanging insert, an upper pressure plate and a lower pressure plate. The upper mold and the lower mold are used in combination, the upper pressure plate is installed on the concave surface of the upper mold, the outer side of the upper pressure plate is provided with a flanging insert, and the lower pressure plate is installed on the convex surface of the lower mold.

[0012] Furthermore, in step S2, the clamping force parameters include the flange contour line length L, in mm, and the flange height B, in mm.

[0013] Furthermore, in step S3, the clamping force parameter satisfies the formula:

[0014] F = L*B*3;

[0015] Wherein, F is the clamping force, unit is N.

[0016] Furthermore, in step S5, the pressure formula of the upper pressing plate of the outer panel flanging die is:

[0017] P = 0.3*flanging force = 0.3LTδb;

[0018] Among them, P is the pressure of the upper pressing plate, L is the length of the flanging line, T is the material thickness, and δb is the tensile strength of the material.

[0019] Furthermore, in step S5, the clamping force is 30% of the pressure of the upper pressing plate, and the clamping force formula is:

[0020] F = 0.3P;

[0021] Among them, F is the clamping force, the unit is N, and P is the pressure of the upper pressing plate.

[0022] An electronic device comprises a processor and a memory which is in communication with the processor and is used to store executable instructions of the processor, wherein the processor is used to execute the method for calculating the clamping force of outer panel clamping and flanging.

[0023] A server includes at least one processor and a memory communicatively connected to the processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor so that the at least one processor executes the outer panel clamping and flanging clamping force calculation method.

[0024] A computer-readable storage medium stores a computer program, wherein the computer program is executed by a processor to calculate the outer plate clamping and flanging clamping force.

[0025] Compared with the prior art, the method for calculating the clamping force of outer plate clamping and flanging described in the present invention has the following advantages:

[0026] The method for calculating the clamping force of outer panel clamping and flanging described in the present invention can accurately calculate the clamping force of clamping and flanging. In addition, the calculation formula of the present invention is also applied to the calculation of the clamping force of clamping and flanging of all parts including inner panels, further improving the applicability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a schematic diagram of a material clamping and flanging mechanism of an outer panel flanging die in the prior art;

[0029] Figure 2 Schematic diagram of the flanging process of the front door outer panel OP30 according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of another perspective of the flanging process of the front door outer panel OP30 according to an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of a material clamping and flanging mechanism according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the lower die of the clamping and flanging mechanism according to an embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of the upper die of the clamping and flanging mechanism described in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] like Figures 1 to 6 As shown, a method for calculating the clamping force of outer plate clamping flange includes the following steps:

[0039] S1. Based on the clamping and flanging mechanism, finite element analysis software is used to simulate and calculate the clamping force parameters of the clamping and flanging;

[0040] S2. Set the clamping force parameters for clamping and flanging;

[0041] S3. Set the clamping force parameters to satisfy the formula;

[0042] S4. Verify that the clamping force parameters satisfy the formula;

[0043] S5. Obtain the final pressure formula of the pressing plate on the outer panel flanging die.

[0044] In step S1, the clamping and flanging mechanism includes an upper mold, a lower mold, a flanging insert, an upper pressing plate and a lower pressing plate. The upper mold and the lower mold are used in combination. The upper pressing plate is installed on the concave surface of the upper mold, a flanging insert is provided on the outer side of the upper pressing plate, and the lower pressing plate is installed on the convex surface of the lower mold.

[0045] To calculate the clamping force, we must first understand the working mechanism of clamping and flanging, that is, why clamping and flanging can reduce springback. As we all know, the springback of outer panels is mainly caused by over-material flanging or under-material flanging. Over-material flanging causes the parts to collapse, while under-material flanging causes the parts to arch up. Especially for over-material flanging, the flanging surface becomes unstable and wrinkled during the flanging process, forming a state similar to a flower skirt. After the flanging is demolded, the compressive stress in the flanging surface causes the stress to release and produce springback. Figure 2 and Figure 3 This is the flanging process of the OP30 front door outer panel, which involves flanging all around.

[0046] The principle of controlling springback by clamping flanging is that during the entire flanging process, the flanging is always clamped by the flanging die and the lower support core, and no instability or wrinkling occurs during the process. After the flanging is completed, there is not much residual stress on the flanging surface. Therefore, the springback value of the part after demolding is significantly improved compared to that of ordinary flanging dies.

[0047] Therefore, the key point is how much clamping force should be used to ensure that the material does not become unstable and wrinkle during the flanging process. The stamping die industry has a parameter value when setting the edge clamping force of the drawing die, that is, when 3MPa (megapascal) pressure is applied to each square meter of material (that is, 1 Newton per square millimeter), the material will not become unstable and wrinkle during the drawing process. This application also basically sets this parameter when using finite element analysis software for simulation calculation. This parameter is still applicable to the case of clamping and flanging.

[0048] The present invention provides the following settings:

[0049] Flanging contour length = L (unit: mm);

[0050] Flanging height = B (unit: mm);

[0051] In order to prevent the L*B flange area from becoming unstable and wrinkling, the following conditions must be met:

[0052] Clamping force F = L*B*3 (unit N)

[0053] Let’s do the following verification:

[0054] Assume that the flange length L = 1000mm,

[0055] Usually the outer plate flange height is B = 8mm.

[0056] According to the above formula, the clamping force F = 1000*8*3 = 24000N.

[0057] Then roughly calculate the clamping force based on 30% of the upper pressure plate pressure mentioned above:

[0058] After long-term exploration, the pressure formula of the upper pressing plate of the outer plate flanging die is set:

[0059] P=0.3*flanging force=0.3LTδb,

[0060] L is the flange length, we assume L = 1000mm,

[0061] T is the material thickness, we usually use the outer plate thickness T = 0.7mm;

[0062] δb is the tensile strength of the material, and is selected based on the tensile strength of the general outer panel opening and closing parts material H180YD = 370.

[0063] In this way, the core pressure P=1000*0.7*370*0.3=77700N,

[0064] The estimated clamping force is F=0.3P=0.3*77700=23310N.

[0065] It can be seen that the estimated value of 23310N based on the core pressure is roughly equivalent to the value of 24000N calculated according to the invented formula. The reason why the estimated value is inaccurate in actual application is due to various influencing factors, such as different core pressure and flange force coefficients selected by different mold factories; the estimation based on empirical values ​​ignores the influence of flange height. The invented formula is a theoretical calculation of the actual value to avoid flange instability.

[0066] Therefore, the present invention can accurately calculate the clamping force of the clamping flange, and the calculation formula of the present invention is also applied to the calculation of the clamping force of the clamping flange of all parts including the inner panel, further improving the applicability of the present invention.

[0067] The present invention also proposes an electronic device, comprising a processor and a memory which is communicatively connected to the processor and is used to store executable instructions of the processor, wherein the processor is used to execute the method for calculating the clamping force of the outer panel clamping and flanging.

[0068] The present invention also proposes a server, comprising at least one processor, and a memory communicatively connected to the processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor so that the at least one processor executes the method for calculating the clamping force of the outer panel clamping and flanging.

[0069] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to calculate the outer panel clamping and flanging clamping force.

[0070] This application is a special project of Hebei Province's Major Science and Technology Support Program, Innovative Application Scenarios, project number 242Q1803Z.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating the clamping force of outer plate clamping and flanging, characterized in that: The following steps are involved: S1. Based on the clamping and flanging mechanism, finite element analysis software is used to simulate and calculate the clamping force parameters of the clamping and flanging; S2. Set the clamping force parameters for clamping and flanging; S3. Set the clamping force parameters to satisfy the formula; S4. Verify that the clamping force parameters satisfy the formula; S5. The clamping force formula is obtained through the pressure formula of the pressing plate on the outer panel flanging die.

2. A method for calculating the clamping force of outer plate flanging according to claim 1, characterized in that: In step S2, the clamping force parameters include the flange contour length L, in mm, and the flange height B, in mm.

3. A method for calculating the clamping force of outer plate flanging according to claim 2, characterized in that: In step S3, the clamping force parameter satisfies the formula: F = L*B*3; Wherein, F is the clamping force, unit is N.

4. A method for calculating the clamping force of outer plate flanging according to claim 3, characterized in that: In step S5, the pressure formula of the upper pressing plate of the outer panel flanging die is: P = 0.3*flanging force = 0.3LTδb; Among them, P is the pressure of the upper pressing plate, L is the length of the flanging line, T is the material thickness, and δb is the tensile strength of the material.

5. The method for calculating the clamping force of outer plate flanging according to claim 4 is characterized in that: In step S5, the clamping force is 30% of the pressure of the upper pressing plate, and the clamping force formula is: F = 0.3P; Among them, F is the clamping force, the unit is N, and P is the pressure of the upper pressing plate.

6. The method for calculating the clamping force of outer plate flanging according to claim 1, characterized in that: In step S1, the clamping and flanging mechanism includes an upper mold, a lower mold, a flanging insert, an upper pressing plate and a lower pressing plate. The upper mold and the lower mold are used in combination. The upper pressing plate is installed on the concave surface of the upper mold, a flanging insert is provided on the outer side of the upper pressing plate, and the lower pressing plate is installed on the convex surface of the lower mold.

7. An electronic device, comprising a processor and a memory connected to the processor for storing instructions executable by the processor, characterized in that: The processor is used to execute the outer panel clamping and flanging clamping force calculation method described in any one of claims 1 to 6.

8. A server, characterized in that: It includes at least one processor and a memory communicatively connected to the processor, the memory storing instructions executable by the at least one processor, the instructions being executed by the processor so that the at least one processor executes the method for calculating the clamping force of outer panel clamping and flanging as described in any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for calculating the clamping force of the outer panel clamping and flanging as described in any one of claims 1 to 6 is implemented.

Images