Method, device and apparatus for stamping an inner hood panel of an integrated hood reinforcement panel

Abstract

A kind of stamping method, device and equipment of hood inner plate of integrated hood reinforcement plate, it includes: obtaining integrally connected hood reinforcement plate and hood inner plate;Wherein, the edge of the closest hood reinforcement plate to the cutting position of hood inner plate is integrally connected to the front windshield side of hood inner plate to form the connecting section of zero distance connection;Control cutting knife stamping separates hood reinforcement plate and hood inner plate;Wherein, cutting knife is all fallen on hood reinforcement plate during stamping separation, and the cutting edge of the cutting position is deformed to the first transition mode in the target direction while stamping separates the two;Shaping after separation hood inner plate and hood reinforcement plate;Wherein, hood reinforcement plate continues to deform to target mode in the target direction from the first transition mode.This scheme realizes compared with original two parts separately production, and material utilization rate can be improved, and two pieces are produced in the field, save the material cost, transportation cost and loss cost brought by hood reinforcement plate outside, to reduce the cost of single vehicle manufacturing.

Description

Technical Field

[0001] The present application relates to the field of automobile stamping parts manufacturing, and in particular to a stamping method, device and equipment for a hood inner panel with an integrated hood reinforcement plate. Background Art

[0002] The hood inner panel and hood reinforcement plate are essential stamping parts for the entire vehicle. Under the traditional stamping process, the hood inner panel is usually a stamping part made in-house by the OEM, and the hood reinforcement plate is a stamping part made outside. Finally, the hood sub-assembly is produced in the OEM's welding plant.

[0003] However, under this production method, the external production of the hood reinforcement plate involves profit management fees, transportation and other costs, and the hood reinforcement plate is drawn separately during the external production process, and its material utilization rate is low. In addition, the lower side of the hood reinforcement plate is welded to the hood inner panel, and there is a 3mm glue gap between the upper side of the hood reinforcement plate and the hood outer panel, which serves to support and strengthen the front area of ​​the hood outer panel to prevent the front of the hood outer panel from shaking during vehicle driving. However, due to the flat shape of the hood reinforcement plate and the soft parts, it is easy to deform during transportation back to the factory after external production. If it is strengthened, it can only be done by increasing the material thickness of the hood reinforcement plate, which will increase the weight of the part. Therefore, the risk of deformation of the external hood reinforcement plate is high, which will affect the quality after installation. Summary of the Invention

[0004] The present application provides a method, device and equipment for stamping a hood inner panel with an integrated hood reinforcement plate, which can solve the related technical problems existing in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a method for stamping a hood inner panel with an integrated hood reinforcement plate, using the following technical solutions:

[0006] A method for stamping a hood inner panel integrated with a hood reinforcement plate, the method comprising:

[0007] Obtain an integrally connected hood reinforcement plate and hood inner panel; wherein the edge of the hood reinforcement plate closest to the portion to be cut of the hood inner panel is integrally connected to the front windshield side of the hood inner panel to form a zero-distance connected connection segment;

[0008] Controlling the cutting blade to punch and separate the hood reinforcement plate and the hood inner panel; wherein, during the punching and separation process, the cutting blade completely falls on the hood reinforcement plate, and while punching and separating the two, pushes the cutting edge of the to-be-cut portion to deform in a target direction to a first transitional shape;

[0009] The hood inner panel and the hood reinforcement panel are reshaped and separated; wherein, the cutting edge of the portion to be cut continues to deform from the first transition form to the target direction to the target form during the shaping process.

[0010] In combination with the first aspect, in one embodiment, the controlling the cutting blade to punch and separate the hood reinforcement plate and the hood inner panel comprises the following steps:

[0011] Punching and separating the cutting edge of the portion to be cut, so that the cutting edge is deflected and deformed in the target direction until it is completely separated from the hood inner panel, thereby forming a cutting edge in a second transitional form;

[0012] The cutting edge of the portion to be cut is pushed in the opposite direction of the target direction to a first transitional state.

[0013] In combination with the first aspect, in one embodiment, the shaping and separating of the hood inner panel and the hood reinforcement panel comprises the following steps:

[0014] determining a virtual connection area between the hood inner panel and the hood reinforcement panel;

[0015] performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area, and determining a springback compensation scheme for the hood inner panel and the hood reinforcement plate during the shaping process;

[0016] According to the rebound compensation scheme, the hood inner panel and the hood reinforcement panel are compensated.

[0017] In conjunction with the first aspect, in one embodiment, before performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area and determining a springback compensation solution for the hood inner panel and the hood reinforcement plate during the shaping process, the following steps are included:

[0018] According to the preset clamping point selection principle, a clamping scheme for clamping the hood inner panel and the hood reinforcement plate regarded as a whole is determined.

[0019] In combination with the first aspect, in one embodiment, the clamping point selection principles include at least the free rebound value of the clamping area, the rebound value stability, the distance from the gauge clamping point and the RPS clamping point, the part rigidity, the clamping force of all clamping points and the locating pin shear force, the distance from the part boundary and the overall number of clamping points.

[0020] In combination with the first aspect, in one embodiment, after determining the clamping scheme for clamping the hood inner panel and the hood reinforcement plate as a whole according to the preset clamping point selection principle, the following steps are included:

[0021] Obtaining a first rebound result of a region of the hood inner panel after performing a rebound analysis on the hood inner panel and the hood reinforcement panel as a whole based on the clamping scheme, and obtaining a second rebound result of performing a rebound analysis on the hood inner panel alone at the same clamping point; and determining whether an error between the first rebound result and the second rebound result meets a preset first error threshold requirement;

[0022] Obtaining a third rebound result of the area where the hood reinforcement plate is located after performing a rebound analysis on the hood inner panel and the hood reinforcement plate as a whole based on the clamping scheme, and obtaining a fourth rebound result of performing a rebound analysis on the hood reinforcement plate alone at the same clamping point; and determining whether an error between the third rebound result and the fourth rebound result meets a preset second error threshold requirement;

[0023] If the first error threshold requirement or the second error threshold requirement is not met, the clamping scheme is readjusted to meet both the first error threshold requirement and the second error threshold requirement.

[0024] In combination with the first aspect, in one embodiment, performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area to determine a springback compensation scheme for the hood inner panel and the hood reinforcement plate during the shaping process includes the following steps:

[0025] Obtaining a springback result of an integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area;

[0026] Determining a springback compensation scheme for the integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area according to the springback result of the integral profile;

[0027] determining whether a springback compensation effect after the springback compensation scheme reshapes the integral surface formed by the hood inner panel and the hood reinforcement panel through the virtual connection area meets a preset dimensional requirement;

[0028] If not, the springback compensation solution is optimized according to the springback compensation effect and the preset size requirement to meet the preset size requirement.

[0029] In a second aspect, an embodiment of the present application provides a stamping die for a hood inner panel integrated with a hood reinforcement plate, which adopts the following technical solution:

[0030] A stamping die for implementing the stamping method of a hood inner panel integrated with a hood reinforcement plate as described above, the stamping die comprising:

[0031] an upper die base including a cutting knife movable up and down in a vertical direction;

[0032] a lower die base, on which a cutting zone is provided directly below the cutting blade; and when the integrally connected hood reinforcement plate and hood inner plate are placed on the lower die base, the portion of the hood reinforcement plate to be cut is suspended above the cutting zone, and the connecting section is aligned with the edge of the cutting zone;

[0033] A reset assembly is provided in the cutting area and comprises a top block which can move up and down, and the top block is used to push the cutting edge of the part to be cut which is deformed to the second transitional shape upward to the first transitional shape.

[0034] In combination with the second aspect, in one embodiment, the upper die base is further provided with a top column, the top column is vertically positioned lower than the cutting knife and moves up and down together with the cutting knife;

[0035] The reset assembly includes an elastic reset member that is telescopic in the vertical direction, and a top block connected to the top of the elastic reset member; and,

[0036] During the stamping process of the cutting blade pressing downward to separate the portion to be cut, after the top column presses down the top block and compresses the elastic reset member, the cutting blade contacts the portion to be cut again. In a third aspect, an embodiment of the present application provides a stamping device for a hood inner panel with an integrated hood reinforcement plate, which adopts the following technical solution:

[0037] A stamping device for a hood inner panel with an integrated hood reinforcement plate, the stamping device for the hood inner panel with an integrated hood reinforcement plate comprising a processor, a memory, and a stamping program for the hood inner panel with an integrated hood reinforcement plate stored on the memory and executable by the processor, wherein when the stamping program for the hood inner panel with an integrated hood reinforcement plate is executed by the processor, the steps of the stamping method for the hood inner panel with an integrated hood reinforcement plate as described above are implemented.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which adopts the following technical solution:

[0039] A computer-readable storage medium stores a stamping program for a hood inner panel with an integrated hood reinforcement plate, wherein when the stamping program for the hood inner panel with an integrated hood reinforcement plate is executed by a processor, the steps of the stamping method for the hood inner panel with an integrated hood reinforcement plate as described above are implemented.

[0040] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0041] By integrally forming the hood reinforcement plate and the hood inner panel, and the hood reinforcement plate is integrally formed on the front windshield side of the hood inner panel, there is no structural overlap in the connection area between the two, so that it is easy to stamp the two apart in the subsequent process, and the material utilization rate can be improved compared with the original two parts produced separately, and the plastic strain generated in the stamping process will be more sufficient, that is, the stamping hardening effect of the two parts obtained after integral molding will be better and the rigidity will be better; and both parts are produced on site, eliminating the material cost, transportation cost and loss cost brought by the external production of the hood reinforcement plate, thereby reducing the manufacturing cost of a single vehicle. In addition, since the hood reinforcement plate and the hood in this application are connected There is no transition material section between the inner panels to match the cutting knife, which can avoid the waste of waste caused by the 8mm transition material section in the traditional stamping process, that is, improve the utilization rate of stamping materials; at the same time, when the hood reinforcement plate without a transition material section is directly subjected to the stamping of the cutting knife, the first transition form of its cutting edge after deformation separation will be closer to the target form of the final finished product state than the state before cutting. Therefore, after separating the two by the stamping separation method of the present application, the hood reinforcement plate and the hood inner panel can be shaped more quickly and conveniently, and finally the finished hood reinforcement plate and hood inner panel are obtained, and the overall stamping process produces less waste and is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flow chart of an embodiment of a method for stamping a hood inner panel with an integrated hood reinforcement plate of the present application;

[0043] Figure 2 This is a schematic diagram of the process flow involved in the stamping method of the hood inner panel integrated with the hood reinforcement plate of the present application;

[0044] Figure 3 This is a partial diagram of the OP20 trimming and punching process in the stamping method of the hood inner panel with an integrated hood reinforcement plate in this application;

[0045] Figure 4 This is a partial diagram of the OP30 trimming and separation process in the stamping method of the hood inner panel integrated with the hood reinforcement plate of this application;

[0046] Figure 5 This is a partial view of the OP30 trimming and separation die used in the stamping method of the hood inner panel with an integrated hood reinforcement plate in this application;

[0047] Figure 6 for Figure 4 Cross-sectional view of the middle BB section when the stamping die is in the closed state;

[0048] Figure 7 for Figure 4 The middle BB section is a cross-sectional view of the hood reinforcement plate after the stamping die has cut through and the die is in the separated state;

[0049] Figure 8 for Figure 4 Cross-sectional view of the middle CC section when the stamping die is in the closed state;

[0050] Figure 9 for Figure 4 Cross-sectional view of the middle CC section when the stamping die is in the closed state;

[0051] Figure 10 This is an axonometric view of the limit block on the lower die base limiting the ejector;

[0052] Figure 11 This is a schematic diagram of the OP40 shaping process in the stamping method of the hood inner panel with integrated hood reinforcement plate of this application;

[0053] Figure 12 This is a schematic diagram of a virtual connection area between a hood reinforcement plate and a hood inner panel in a stamping method of a hood inner panel integrated with a hood reinforcement plate according to the present application;

[0054] Figure 13 This is a schematic diagram of the hardware structure of the stamping equipment for the hood inner panel with integrated hood reinforcement plate involved in the embodiment of the present application.

[0055] Reference numerals:

[0056] 1. Hood inner panel; 2. Hood reinforcement plate; 110. Punch; 150. Pressing plate; 151. Ejector column; 152. Upper die base; 153. Nitrogen cylinder; 154. Cutting knife; 31. Hollow area; 111. Ejector block; 112. Limit block; 113. Ejector; 114. Spring; 116. Limit gap; 21. Waste material 1; 22. Waste material 2; 23. Waste material 3; 32. Connection section 1; 33. Connection section 2; 41-50. Flange; 60. Virtual connection area; 71. Part to be cut 1; 72. Part to be cut 2. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0059] In a first aspect, an embodiment of the present application provides a method for stamping a hood inner panel with an integrated hood reinforcement plate.

[0060] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the stamping method of the hood inner panel 1 integrated with the hood reinforcement panel 2 of this application. Figure 1 As shown, the stamping method of the hood inner panel 1 integrated with the hood reinforcement panel 2 includes:

[0061] S100, obtaining an integrally connected hood reinforcement plate 2 and hood inner panel 1; wherein the edge of the hood reinforcement plate 2 closest to the portion to be cut of the hood inner panel 1 is integrally connected to the front windshield side of the hood inner panel 1 to form a zero-distance connection segment;

[0062] In this embodiment, the hood reinforcement plate 2 has two symmetrical and spaced portions to be cut on one side close to the hood inner plate 1, namely, a portion to be cut 71 and a portion to be cut 72 (see FIG. Figure 12 ). Therefore, the obtained hood reinforcement plate 2 and hood inner plate 1 have two zero-distance connection sections, namely connection section 1 32 and connection section 2 33, see Figure 3 .

[0063] S200, controlling the cutting blade 154 to punch and separate the hood reinforcement plate 2 and the hood inner panel 1; wherein, during the punching and separation process, the cutting blade 154 completely falls on the hood reinforcement plate 2, and while punching and separating the two, the cut edge of the hood reinforcement plate 2 is deformed in the target direction to a first transitional shape;

[0064] Among them, during the stamping separation process, the hood inner panel 1 on the connecting section 32 side is placed on the lower die base of the stamping die, while the connecting section and the hood reinforcement plate 2 on the other side of the connecting section to be cut are suspended on the cutting area of ​​the stamping die. When the cutting knife 154 is pressed down, its edge close to the hood inner panel 1 will be aligned with the connecting section. Then, the cutting knife 154 will separate the hood inner panel 1 and the hood reinforcement plate 2 at the connecting section during the stamping process, and cause the suspended part to be cut of the hood reinforcement plate 2 to deform toward the cutting area below.

[0065] S300, shaping the separated hood inner panel 1 and the hood reinforcement plate 2; wherein, the cut edge of the hood reinforcement plate 2 continues to deform from the first transition shape to the target direction to the target shape during the shaping process.

[0066] Among them, regarding step S100 of obtaining the hood reinforcement plate 2 and the hood inner panel 1 connected in one piece at zero distance through the connecting section, the obtaining process is specifically for the hood reinforcement plate 2 and the hood inner panel 1 formed simultaneously on a blank sheet. Since at this time, in addition to the connecting section connected at zero distance, there is still a connecting material body with a certain area that is unavoidable due to the integral molding, so the connecting material body except the connecting section needs to be cut off, that is, the whole needs to be trimmed and punched to obtain the hood reinforcement plate 2 and the hood inner panel 1 connected in zero distance only through the connecting section. Therefore, for a sheet of sheet material with the hood reinforcement plate 2 and the hood inner panel 1 formed, it will go through the following process. Figure 2 The four processes shown include OP10 drawing, OP20 trimming and punching (OP10 and OP20 correspond to step S100 provided in this application), OP30 stamping and separation (corresponding to step 200 provided in this application), and OP40 shaping (corresponding to step S300 provided in this application). Finally, a blank sheet is used to obtain two parts, the hood inner panel 1 and the hood reinforcement panel 2.

[0067] The difference between the present application and the conventional stamping scheme of the integrated hood inner panel 1 is that: in the conventional scheme, the splicing distance between the hood reinforcement plate 2 and the hood inner panel 1 generally needs to be greater than 8 mm, ensuring that the trimming knife in the separation process is at least 8 mm wide, thereby ensuring that the trimming knife body is strong enough when trimming and separating the large and small parts. However, this splicing distance will result in the need for a transition material section at least 8 mm wide as a connecting section, resulting in the need to increase the sheet material and causing waste of blank material;

[0068] This solution uses process arrangement and adaptive mold structure to achieve zero splicing distance between the hood reinforcement plate 2 and the hood inner plate 1. Figure 2 As shown, the subsequent hood reinforcement plate 2 and the hood inner plate 1 will first cut off the waste 1 21, waste 22, and waste 3 23 on both sides of the connection section between the two in the OP20 trimming and punching process; then, refer to Figure 4 The remaining connecting segments 1 32 and 2 33 will be cut and separated during the OP30 stamping and separation process. Therefore, cutting blades 154 are required on the upper and lower die blocks at both connecting segments 1 32 and 2 33. After the stamping and separation process is completed, the separated segments will be reshaped. For the hood reinforcement plate 2, its trimmed area will need to be further reshaped from the first transitional shape toward the target direction to the final target shape.

[0069] In order to prevent the deformed portion of the hood reinforcement plate 2 to be cut from being stuck on the lower die base after the stamping separation process is completed, further, in one embodiment, the step S200 of controlling the cutting blade 154 to stamp and separate the hood reinforcement plate 2 and the hood inner panel 1, i.e., the stamping separation process, includes the following steps:

[0070] S210, the cutting part of the hood reinforcement plate 2 is separated by stamping, and is deformed to the target direction to completely separate from the inner panel 1, and a second transition form is formed;

[0071] When stamping and separating, the hood reinforcement plate 2 is separated from the inner panel 1 along the connecting section.

[0072] S220, the cutting edge of the hood reinforcement plate 2 is pushed to the first transition form in the opposite direction of the target direction.

[0073] Specifically, in the embodiment, the lower part of the hollow area 3131 between the two cutting parts of the hood reinforcement plate 2 in the cutting area is provided with a reset assembly, and the cutting edge of the hood reinforcement plate 2 is pushed upward by the reset assembly.

[0074] In the embodiment, when the cutting part of the hood reinforcement plate 2 is completely separated by stamping to form a second transition form of the cutting edge, the cutting edge in the deformed state is tightly pressed against the side wall of the lower die seat on the side close to the inner panel 1 due to the upward reset of the material, see Figure 6 , there is a possibility that the separated hood reinforcement plate 2 cannot be directly taken out, therefore, after the second transition form of the cutting edge is formed, the reset assembly arranged in the lower area of the second transition form is used to push the cutting edge to the first transition form in the opposite direction of the target direction, see Figure 7 , so that it can smoothly be taken out after passing through the lower die seat below the inner panel 1, and finally the deformation degree of the cutting part of the hood reinforcement plate 2 in the target direction comes to the first transition form which is lower than the second transition form.

[0075] After the inner panel 1 and the hood reinforcement plate 2 are cut and separated into two independent parts; it is necessary to shape them at OP40. See Figure 11 , the shaded area of the inner panel 1 needs to be shaped, that is, the front windshield side of the inner panel 1 connected with the hood reinforcement plate 2 needs to be shaped, but the flanges 41-50 are already formed in place by drawing, and the shaping amount is basically small, so the shaping of the shaded area of the inner panel 1 has little effect on the final springback; but Figure 11 The ten flanges 41-50 of the hood reinforcement plate 241-50 need to be shaped in place at OP40, and the shaping amount is large, which will cause a large springback of the product surface of the hood reinforcement plate 2 except the shaping areas 41-50, so the springback result must consider the influence of the shaping process. In order to ensure the size of the hood reinforcement plate 2 is qualified, the springback value after shaping must be used to compensate in the stamping finite element compensation software.

[0076] However, since the two parts have been separated, if the two parts are analyzed separately, only the individual rebound results of the hood inner panel 1 or the hood reinforcement panel 2 can be analyzed. The compensation strategy uses the individual rebound results of the hood inner panel 1 or the hood reinforcement panel 2 for compensation. The specific process is as follows:

[0077] Step 1: First, use the separate springback result after the shaping of the hood reinforcement plate 2 to compensate. The product surface of the hood reinforcement plate 2 except the shaping areas shown in Figures 41-50 is used as the direct springback compensation area, the pressing surface and the mold surface where the hood inner panel 1 is located are used as the fixed area, and the other areas are used as the transition area between the fixed area and the compensation area. The stamping finite element simulation software is used to automatically perform springback compensation on all the processes involved until the hood reinforcement plate 2 with the dimensional analysis meeting the requirements after compensation is obtained. The above is the first compensation step. During the first compensation process, the stamping finite element simulation software may need multiple rounds of full-process compensation to obtain the ideal springback result of the hood reinforcement plate.

[0078] Step 2: Using the newly compensated profiles of each process in the first step, analyze the individual springback results of the hood inner panel 1 after the shaping process is completed, and then perform individual springback compensation on the hood inner panel 1 based on this springback result. Use the area where the hood inner panel 1 is located as the direct springback compensation area, the profiles where the pressing surface and the hood reinforcement plate 2 are located as the fixed area, and other areas as the transition area between the fixed area and the compensation area. Similarly, use the stamping finite element simulation software to perform full-process automatic springback compensation on all the processes involved until a qualified hood inner panel 1 is obtained. Similarly, in the second step compensation process, the stamping finite element simulation software may require multiple rounds of full-process compensation to obtain the ideal springback result of the hood reinforcement version.

[0079] Step 3: Recheck the springback result of the hood reinforcement plate 2 using the newly compensated profiles obtained in each process in step 2.

[0080] However, since the profile after the second step of compensation is different from the profile after the first step of compensation, and the hood inner panel 1 and the hood reinforcement plate 2 are formed using the same sheet of material, the plastic strain state of each part of the entire sheet of material will change compared to the state after the first step. Therefore, the rebound result of the hood reinforcement plate 2 after the second step of compensation is inevitably different from the rebound result after the first step of compensation. It may be necessary to repeat the steps of the first step to compensate for the rebound of the hood reinforcement plate 2, and the ideal compensation result may not be obtained, which may lead to compensation failure, and so on.

[0081] Based on the above problems that may arise from performing separate compensation analysis on the two parts, further, in some embodiments provided in the present application, the step S300 of shaping the separated hood inner panel 1 and the hood reinforcement panel 2, i.e., the shaping process, includes the following steps:

[0082] S310, determining a virtual connection area 6060 between the hood inner panel 1 and the hood reinforcement panel 2;

[0083] S320: Perform a springback compensation analysis on the integral surface formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 6060 to determine a springback compensation solution for the hood inner panel 1 and the hood reinforcement panel 2 during the shaping process.

[0084] S330. Compensate the hood inner panel 1 and the hood reinforcement panel 2 according to the rebound compensation solution.

[0085] This solution treats the two parts as a whole for full process compensation when performing springback compensation. However, since the two parts have been separated and are two separate parts, they cannot be considered as a whole according to the existing process, which brings difficulties to part development. To solve the above problems, Figure 12 As shown, this solution selects a virtual connection area 60, and connects the hood inner panel 1 and the hood reinforcement plate 2 after the OP40 sequence is completed using the virtual connection area 60, regards the two separate parts as a whole, and conducts comprehensive rebound analysis and compensation. The virtual connection area 60 needs to be set in an area where the hood inner panel 1 and the hood reinforcement plate 2 are not shaped, that is, this virtual connection area 60 is basically not affected by the shaping, and its width is as narrow as possible. Therefore, in this embodiment, it is preferably the middle position between the two parts to be cut, and the width is preferably 10 mm, because there is no shaping amount on the flanges 41 to 50 of the hood inner panel 1 here, and there is no shaping content on the hood reinforcement plate 2 here, and it is far away from the two parts to be cut 71 and 72 to be cut, and the driving effect on the virtual connection area 60 shown is extremely small.

[0086] After the virtual connection area 60 is selected, the hood inner panel 1 and the hood outer panel can be regarded as a whole during the shaping process, and the springback analysis after the shaping is completed is performed on the whole.

[0087] However, before officially starting springback compensation, it is necessary to determine which clamping state's springback results will be used for compensation. Generally, since parts clamped entirely at RPS points are overconstrained and cannot reflect the actual springback of the parts, compensation is generally not recommended. Free springback of parts in an unclamped state does not consider gravity and is not clamped, and the difference from the actual measurement is large, so compensation is also not recommended.

[0088] Therefore, further, the present application provides some embodiments, which include the following steps before step S300, i.e., the shaping process:

[0089] S230. Determine a clamping scheme for clamping the hood inner panel 1 and the hood reinforcement panel 2 as a whole according to a preset clamping point selection principle.

[0090] Among them, the principles for selecting clamping points include at least the free rebound value of the clamping area, the rebound value stability, the distance from the clamping point of the gauge and the RPS clamping point, the rigidity of the part, the clamping force of all clamping points and the shear force of the locating pin, the distance from the part boundary, and the total number of clamping points.

[0091] Specifically, this solution connects the hood inner panel 1 and the hood reinforcement panel 2 with a virtual connection area 60, selects the minimum clamping points as a whole, and uses the rebound result under the minimum clamping solution to perform rebound compensation. The principle of selecting the minimum clamping points is as follows:

[0092] 1. Prioritize the selection in the area with small free rebound and stable rebound value;

[0093] 2. Get as close as possible to the clamping point of the gauge and the RPS clamping point;

[0094] 3. Determine in the final inspection posture;

[0095] 4. Select parts with good rigidity;

[0096] 5. The clamping force of the minimum clamping point and the shear force of the positioning pin are ≤10KN;

[0097] 6. Do not get too close to the boundary of the part;

[0098] 7. The number should not be too large, 4-6 is recommended to avoid excessive constraints.

[0099] At the same time, in addition to meeting the above principles, the minimum clamping point of this solution requires that the rebound result of the hood inner panel 1 alone at the minimum clamping point be similar to the rebound result of the hood inner panel 1 when the hood inner panel 1 and the hood reinforcement panel 2 are connected as a whole by the virtual connection area 60 and at the minimum clamping point. The rebound result of the hood reinforcement panel 2 alone at the minimum clamping point also needs to be similar to the rebound result of the hood reinforcement panel 2 when the hood inner panel 1 and the hood reinforcement panel 2 are connected as a whole by the virtual connection area 60 and at the minimum clamping point. Therefore, the present application further provides some embodiments, which, after step S230, also include the following steps:

[0100] S240, obtaining a first rebound result of the area where the hood inner panel 1 is located after performing a rebound analysis on the hood inner panel 1 and the hood reinforcement panel 2 as a whole based on the clamping scheme, and obtaining a second rebound result of performing a rebound analysis on the hood inner panel 1 alone at the same clamping point; and determining whether an error between the first rebound result and the second rebound result meets a preset first error threshold requirement;

[0101] S250, obtaining a third rebound result of the area where the hood reinforcement plate 2 is located after performing a rebound analysis on the hood inner panel 1 and the hood reinforcement plate 2 as a whole based on the clamping scheme, and obtaining a fourth rebound result of performing a rebound analysis on the hood reinforcement plate 2 alone at the same clamping point; and determining whether an error between the third rebound result and the fourth rebound result meets a preset second error threshold requirement;

[0102] S260: If the first error threshold requirement or the second error threshold requirement is not met, readjust the clamping scheme to meet both the first error threshold requirement and the second error threshold requirement.

[0103] After the minimum clamping scheme is selected through the above steps, the rebound result under the minimum clamping scheme after the shaping process is completed is used, and the hood inner panel 1 and the hood reinforcement plate 2 are treated as a whole in the stamping finite element simulation software to perform full-process springback compensation, that is, the springback result of the hood inner panel 1 and the hood reinforcement plate 2 as a whole under the minimum clamping scheme after the shaping process is used, and the hood inner panel 1 and the hood reinforcement plate 2 as a whole are used as the compensation area, the pressing surface is used as the fixed area, and the other surfaces are used as the transition area. By performing full-process compensation on all processing steps involved in the previous two parts, the final result after springback compensation is based on the hood inner panel 1 and the hood reinforcement plate 2 under their respective RPS clamping schemes. It is necessary to separately confirm the springback compensation effect until the compensation is qualified. According to this requirement, the present application further provides some embodiments,

[0104] Step S320 includes the following steps:

[0105] S321, obtaining a springback result of the integral profile formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 60;

[0106] S322, determining a springback compensation scheme for the integral surface formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 60 according to the springback result of the integral surface;

[0107] S323, determining whether the rebound compensation effect of the rebound compensation scheme on the overall surface formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 60 meets the preset size requirements;

[0108] S324: If not, optimize the springback compensation solution according to the springback compensation effect and the preset size requirement to meet the preset size requirement.

[0109] Among them, the preset size requirements are the size requirements of the hood inner panel 1 and the hood reinforcement panel 2 after rebound compensation is performed separately under their respective RPS clamping schemes.

[0110] After obtaining a springback compensation solution that meets the above requirements, the overall surface will be constructed in an external CAD software based on the springback compensation data of the stamping finite element simulation software, and finally imported into the stamping finite element simulation software for final springback result confirmation. After passing the test, multiple rounds of optimization will be carried out to produce the final processing data.

[0111] Finally, according to the solution of utilizing the virtual connection area 60 provided in this application, the hood reinforcement plate 2 and the hood inner panel 1 can be compensated simultaneously, so as to quickly and accurately complete the compensation when the two parts are integrated into a piece of sheet material, effectively reduce the number of compensation rounds, and realize the correct compensation under the integrated stamping scheme of the hood inner panel 1 and the hood reinforcement plate 2.

[0112] In a second aspect, the present application also provides a stamping die for implementing the stamping method of the hood inner panel 1 integrated with the hood reinforcement panel 2 as described above, see Figures 6-10 , the stamping die comprises:

[0113] an upper die base 152 comprising a cutting blade 154 that can move up and down in the vertical direction;

[0114] The lower die base is provided with a cutting area directly below the cutting blade 154; and when the integrally connected hood reinforcement plate 2 and hood inner plate 1 are placed on the lower die base, the portion to be cut of the hood reinforcement plate 2 is suspended above the cutting area, and the connecting section is aligned with the edge of the cutting area;

[0115] A reset assembly is provided in the cutting area and includes a top block 111 that can move up and down. The top block 111 is used to push the cutting edge of the portion to be cut that is deformed to the second transitional shape upward to the first transitional shape.

[0116] The reset assembly includes an elastic reset member that is telescopic in the vertical direction, and a top block 111 connected to the top of the elastic reset member; and,

[0117] During the punching process of the cutting blade 154 punching downward to separate the portion to be cut, after the top column 151 presses down the top block 111 and compresses the elastic return member, the cutting blade 154 contacts the portion to be cut again.

[0118] Specifically, in this embodiment, a cutting knife 154, a pressing plate 150, and a nitrogen cylinder 153 are provided on the upper die base 152. A push column 151 is provided on the pressing plate 150. The pressing plate 150 is also provided with a limit position to ensure that it can be pushed out of a certain stroke on the upper die base 152 but will not fall out; the nitrogen cylinder 153 is used to drive the cutting knife 154 and the push column 151 to move vertically.

[0119] The lower die base is provided with a punch 110, and an ejector 113, i.e., a reset component, is provided in the hollow area 31 between the two parts to be cut in the cutting area. Correspondingly, a circular hole for installing the ejector 113 is provided in the punch 110, and a spring 114 is provided under the ejector 113. The ejector block 111 is fixed to the ejector 113 by bolts. In addition, the limit block 112 is fixed to the punch 110 by bolts.

[0120] Before the stamping die is closed, the top block 111 is in the jacking state, and its upper surface is in contact with the lower surface of the product. The pressing plate 150 is in the ejecting state under the action of the nitrogen cylinder 153. As the upper die base 152 descends, the pressing plate 150 first presses the sheet metal and Figure 6 and Figure 9 It can be seen that at this time, the top column 151 contacts the top block 111 in advance and compresses the spring 114, pressing the top block 111 down to the bottom dead center state to ensure that it is separated from the sheet material; the mold continues to move downward to the closed state, and under the action of the cutting knife 154 and the punch 110, the connecting section is cut off, and the hood inner panel 1 and the hood reinforcement panel 2 are in a cut-off and separated state; thereafter, refer to Figure 7 , the upper die base 152 moves upward, the pressing plate 150 finally separates from the lower die base, the spring 114 begins to release, and the ejector block 111 is ejected until the ejector block 111 pushes out the cut hood reinforcement plate 2, and then the hood inner plate 1 and the hood reinforcement plate 2 are taken out and placed on the OP40 shaping die to complete the subsequent process;

[0121] See also Figure 8-10 , respectively, are cross-sectional views of the stamping die CC section before and after closing, and an axonometric view of the ejector block 111 assembly. As can be seen from the figure, before the die is closed, the spring 114 is released, pushing the support and ejector block 111 to their top dead center. At this time, the stop block 112 fixed on the lower die base contacts the protrusion on one side of the ejector 113, that is, the limit gap 116 is zero, and the ejector block 111 is now in contact with the bottom surface of the sheet. As the upper die base 152 descends, the ejector column 151 begins to contact the ejector block 111, compressing the spring 114 to the bottom dead center, ensuring that the ejector block 111 is 20mm away from the sheet. At this time, there is a limit gap of 20mm between the stop block 112 and the ejector 113. After closing and cutting, the die ascends, and the ejector block 111 is ejected under the action of the spring 114, pushing the cut hood reinforcement plate 2 out of the punch 110, preventing the hood reinforcement plate 2 from getting stuck in the cutting edge of the punch 110 after being cut, resulting in the problem of being unable to remove the part.

[0122] Among them, the functional implementation of each module in the stamping device of the hood inner panel with the above-mentioned integrated hood reinforcement plate corresponds to the various steps in the embodiment of the stamping method of the hood inner panel with the above-mentioned integrated hood reinforcement plate, and its functions and implementation processes will not be repeated here one by one.

[0123] On the third aspect, an embodiment of the present application provides a stamping device for a hood inner panel with an integrated hood reinforcement plate. The stamping device for a hood inner panel with an integrated hood reinforcement plate can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0124] Reference Figure 13 , Figure 13 This is a schematic diagram of the hardware structure of the punching equipment for the hood inner panel with integrated hood reinforcement plate involved in the embodiment of the present application. In the embodiment of the present application, the punching equipment for the hood inner panel with integrated hood reinforcement plate may include a processor, a memory, a communication interface, and a communication bus.

[0125] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0126] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, used to interconnect components within the punching equipment for the hood inner panel of the integrated hood reinforcement plate, as well as interfaces used to interconnect the punching equipment for the hood inner panel of the integrated hood reinforcement plate with other devices (e.g., other computing devices or user devices). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user devices can be displays, keyboards, etc.

[0127] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0128] The processor may be a general-purpose processor that can call a stamping program for a hood inner panel with an integrated hood reinforcement plate stored in a memory and execute the stamping method for a hood inner panel with an integrated hood reinforcement plate provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the stamping program for a hood inner panel with an integrated hood reinforcement plate is called may refer to the various embodiments of the stamping method for a hood inner panel with an integrated hood reinforcement plate of the present application and will not be further described here.

[0129] Those skilled in the art will understand that Figure 13 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0130] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0131] The computer-readable storage medium of the present application stores a stamping program for the hood inner panel with an integrated hood reinforcement plate, wherein when the stamping program for the hood inner panel with an integrated hood reinforcement plate is executed by the processor, the steps of the stamping method for the hood inner panel with an integrated hood reinforcement plate as described above are implemented.

[0132] Among them, the method implemented when the stamping procedure of the hood inner panel with an integrated hood reinforcement plate is executed can refer to the various embodiments of the stamping method of the hood inner panel with an integrated hood reinforcement plate of the present application, and will not be repeated here.

[0133] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0134] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0135] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0136] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0137] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0138] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0139] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A stamping method for a hood inner panel with an integrated hood reinforcement plate, characterized in that: The stamping method of the hood inner panel integrated with the hood reinforcement plate includes: Obtain an integrally connected hood reinforcement plate and hood inner panel; wherein the edge of the hood reinforcement plate closest to the portion to be cut of the hood inner panel is integrally connected to the front windshield side of the hood inner panel to form a zero-distance connected connection segment; Controlling the cutting blade to punch and separate the hood reinforcement plate and the hood inner panel; wherein, during the punching and separation process, the cutting blade completely falls on the hood reinforcement plate, and while punching and separating the two, pushes the cutting edge of the to-be-cut portion to deform in a target direction to a first transitional shape; The hood inner panel and the hood reinforcement panel are reshaped and separated; wherein, the cutting edge of the portion to be cut continues to deform from the first transition form to the target direction to the target form during the shaping process.

2. The punching method of the hood inner panel integrated with the hood reinforcement plate according to claim 1, characterized in that: The controlling cutting blade to punch and separate the hood reinforcement plate and the hood inner plate comprises the following steps: Punching and separating the cutting edge of the portion to be cut, so that the cutting edge is deflected and deformed in the target direction until it is completely separated from the hood inner panel, thereby forming a cutting edge in a second transitional form; The cutting edge of the portion to be cut is pushed in the opposite direction of the target direction to a first transitional state.

3. The punching method of the hood inner panel integrated with the hood reinforcement plate according to claim 1, characterized in that: The shaping and separation of the hood inner panel and the hood reinforcement panel comprises the following steps: determining a virtual connection area between the hood inner panel and the hood reinforcement panel; performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area, and determining a springback compensation scheme for the hood inner panel and the hood reinforcement plate during the shaping process; According to the rebound compensation scheme, the hood inner panel and the hood reinforcement panel are compensated.

4. The punching method of the hood inner panel integrated with the hood reinforcement plate according to claim 3, characterized in that: Before performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area and determining a springback compensation solution for the hood inner panel and the hood reinforcement plate during the shaping process, the steps include: According to the preset clamping point selection principle, a clamping scheme for clamping the hood inner panel and the hood reinforcement plate regarded as a whole is determined.

5. The method for punching a hood inner panel integrated with a hood reinforcement plate according to claim 4, wherein: The clamping point selection principles include at least the free rebound value of the clamping area, the rebound value stability, the distance from the gauge clamping point and the RPS clamping point, the part rigidity, the clamping force of all clamping points and the locating pin shear force, the distance from the part boundary and the total number of clamping points.

6. The method for punching a hood inner panel integrated with a hood reinforcement plate according to claim 5, wherein: After determining the clamping scheme for clamping the hood inner panel and the hood reinforcement plate as a whole according to the preset clamping point selection principle, the following steps are included: Obtaining a first rebound result of a region of the hood inner panel after performing a rebound analysis on the hood inner panel and the hood reinforcement panel as a whole based on the clamping scheme, and obtaining a second rebound result of performing a rebound analysis on the hood inner panel alone at the same clamping point; and determining whether an error between the first rebound result and the second rebound result meets a preset first error threshold requirement; Obtaining a third rebound result of the area where the hood reinforcement plate is located after performing a rebound analysis on the hood inner panel and the hood reinforcement plate as a whole based on the clamping scheme, and obtaining a fourth rebound result of performing a rebound analysis on the hood reinforcement plate alone at the same clamping point; and determining whether an error between the third rebound result and the fourth rebound result meets a preset second error threshold requirement; If the first error threshold requirement or the second error threshold requirement is not met, the clamping scheme is readjusted to meet both the first error threshold requirement and the second error threshold requirement.

7. The method for punching a hood inner panel integrated with a hood reinforcement plate according to claim 3, wherein: The step of performing a springback compensation analysis on the integral profile formed by the hood inner panel and the hood reinforcement plate through the virtual connection area to determine a springback compensation scheme for the hood inner panel and the hood reinforcement plate during the shaping process comprises the following steps: Obtaining a springback result of an integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area; Determining a springback compensation scheme for the integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area according to the springback result of the integral profile; determining whether a springback compensation effect after the springback compensation scheme reshapes the integral surface formed by the hood inner panel and the hood reinforcement panel through the virtual connection area meets a preset dimensional requirement; If not, the springback compensation solution is optimized according to the springback compensation effect and the preset size requirement to meet the preset size requirement.

8. A stamping die for implementing the stamping method of the hood inner panel integrated with the hood reinforcement plate according to claim 2, characterized in that: The stamping die comprises: an upper die base including a cutting knife movable up and down in a vertical direction; a lower die base, on which a cutting zone is provided directly below the cutting blade; and when the integrally connected hood reinforcement plate and hood inner plate are placed on the lower die base, the portion of the hood reinforcement plate to be cut is suspended above the cutting zone, and the connecting section is aligned with the edge of the cutting zone; A reset assembly is provided in the cutting area and comprises a top block which can move up and down, and the top block is used to push the cutting edge of the part to be cut which is deformed to the second transitional shape upward to the first transitional shape.

9. The stamping die according to claim 8, wherein: The upper die base is also provided with a top column, which is vertically lower than the cutting knife and moves up and down with the cutting knife; The reset assembly includes an elastic reset member that is telescopic in the vertical direction, and a top block connected to the top of the elastic reset member; and, During the punching process in which the cutting blade punches downward to separate the portion to be cut, after the top column presses down the top block and compresses the elastic reset member, the cutting blade contacts the portion to be cut again.

10. A stamping device for a hood inner panel with an integrated hood reinforcement plate, characterized in that: The stamping equipment of the hood inner panel of the integrated hood reinforcement plate includes a processor, a memory, and a stamping program of the hood inner panel of the integrated hood reinforcement plate stored on the memory and executable by the processor, wherein when the stamping program of the hood inner panel of the integrated hood reinforcement plate is executed by the processor, the steps of the stamping method of the hood inner panel of the integrated hood reinforcement plate as described in any one of claims 1 to 7 are implemented.

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