Stamping method, device and equipment for hood inner plate integrated with hood reinforcing plate

Abstract

The invention discloses a stamping method, device and equipment for a hood inner plate integrated with a hood reinforcing plate. The stamping method comprises the steps that the hood reinforcing plate and the hood inner plate which are integrally connected are obtained; the edge, closest to the to-be-cut part of the hood inner plate, of the hood reinforcing plate is integrally connected to the front windshield side of the hood inner plate to form a zero-distance connection section. A cut-off tool is controlled to stamp and separate the hood reinforcing plate and the hood inner plate; wherein the cut-off tool completely falls on the hood reinforcing plate in the stamping separation process, and the cut edge of the to-be-cut part deforms to a first transition form in the target direction while the cut-off tool and the hood reinforcing plate are stamped and separated; shaping the separated hood inner plate and hood reinforcing plate; wherein the hood reinforcing plate continuously deforms to the target form from the first transition form to the target direction. According to the scheme, compared with the original mode that two parts are independently manufactured, the material utilization rate can be increased, the two parts are both produced in the field, the material cost, the transportation cost and the loss cost caused by external manufacturing of the hood reinforcing plate are saved, and then the bicycle manufacturing cost is reduced.

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 panel. 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 an external stamping part. 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 coating 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, and 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 an inner panel of a hood with an integrated hood reinforcement plate, which can solve 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 solution:

[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 plate; wherein the edge of the hood reinforcement plate closest to the to-be-cut portion of the hood inner plate is integrally connected to the front windshield side of the hood inner plate to form a zero-distance connected connection section;

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

[0009] The hood inner panel and the hood reinforcement panel are shaped and separated; wherein the cutting edge of the to-be-cut portion continues to deform from the first transition shape to the target direction to the target shape 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 plate comprises the following steps:

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

[0012] The cutting edge of the to-be-cut portion 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 panel through the virtual connection area, and determining a springback compensation scheme for the hood inner panel and the hood reinforcement panel during the shaping process;

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

[0017] In combination 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 scheme 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 panel 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 panel as a whole according to the preset clamping point selection principle, the following steps are included:

[0021] Obtaining a first rebound result of the area where the hood inner panel is located after the hood inner panel and the hood reinforcement panel, which are considered as a whole, are subjected to a rebound analysis based on the clamping scheme, and obtaining a second rebound result after the hood inner panel is subjected to a rebound analysis at the same clamping point alone; 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 springback result of the area where the hood reinforcement plate is located after the hood inner panel and the hood reinforcement plate, which are considered as a whole, are subjected to springback analysis based on the clamping scheme, and obtaining a fourth springback result after the hood reinforcement plate is subjected to springback analysis alone at the same clamping point; determining whether an error between the third springback result and the fourth springback 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 simultaneously meet the first error threshold requirement and the second error threshold requirement.

[0024] In combination with the first aspect, in one embodiment, the performing of 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:

[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 the springback compensation effect after the springback compensation scheme shapes the integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area meets the preset size requirements;

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

[0029] In a second aspect, an embodiment of the present application provides a stamping die for a hood inner panel with an integrated 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 that can move up and down in a vertical direction;

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

[0033] A reset assembly is arranged 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 to-be-cut portion deformed to the second transitional form upward to the first transitional form.

[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 the top column 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] In the process of stamping the cutting knife downward to separate the part to be cut, after the top column presses down the top block and compresses the elastic reset member, the cutting knife contacts the part 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 a 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 in 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 brought by the technical solution 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 connecting area of ​​the two, so that the two can be easily separated by stamping 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 work 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 caused 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 the present application are There is no transition material section between the inner panels to match the cutting knife, thereby avoiding the waste of waste caused by the 8mm transition material section in the traditional stamping process, that is, improving 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 formed by the 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 A schematic 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 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 punching method of the hood inner panel with integrated hood reinforcement plate of 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 with integrated hood reinforcement plate of this application;

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

[0047] Figure 6 for Figure 4 The 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 when the stamping die has completed cutting off the hood reinforcement plate and the die is in a separated state;

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

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

[0051] Fig.10 Axonometric drawing of the ejector being limited by the limit block on the lower die base;

[0052] Fig.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 the present application;

[0053] Fig.12 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 of the present application;

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

[0055] Reference numerals:

[0056] 1. Hood inner plate; 2. Hood reinforcement plate; 110. Punch; 150. Pressing plate; 151. Ejector column; 152. Upper die seat; 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 one; 22. Waste material two; 23. Waste material three; 32. Connection section one; 33. Connection section two; 41-50. Flange; 60. Virtual connection area; 71. Part to be cut one; 72. Part to be cut two. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, 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 the present application clearer, the implementation methods of the present 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 schematic flow chart of a first embodiment of a stamping method for a hood inner panel 1 integrated with a hood reinforcement panel 2 of the present 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 plate 1; wherein the edge of the hood reinforcement plate 2 closest to the to-be-cut portion of the hood inner plate 1 is integrally connected to the front windshield side of the hood inner plate 1 to form a zero-distance connected connection segment;

[0062] In this embodiment, since 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. Fig.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 plate 1; wherein, during the punching and separation process, the cutting blade 154 all 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 form;

[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 seat of the stamping die, while the connecting section and the part to be cut of the hood reinforcement plate 2 on the other side of the connecting section 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 and separating the 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 to obtain the hood reinforcement plate 2 and the hood inner panel 1 connected in one piece at zero distance through the connecting section, the acquisition 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 in zero distance, there is still a connecting material body with a certain area that cannot be avoided due to the one-piece molding between the hood reinforcement plate 2 and the hood inner panel 1, it is necessary to cut off the connecting material body except the connecting section, that is, it is necessary to trim and punch the whole body 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, namely 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, and then ensuring that the trimming knife body strength is strong enough when trimming and separating the large and small parts, but this splicing distance will result in the need for a transition material section of at least 8 mm width as a connecting section, resulting in the need to increase the sheet material, resulting in a waste of blank material;

[0068] This solution uses a process arrangement and an adaptive mold structure to achieve a 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 of the two in the OP20 trimming and punching process; then, refer to Figure 4 , the remaining connection segment 1 32 and connection segment 2 33 of the two will be cut and separated in the OP30 stamping and separation process. Therefore, in the stamping and separation process, it is necessary to set a cutting knife 154 on the upper and lower die seats at the connection segment 1 32 and the connection segment 2 33. After the stamping and separation process is completed, the two separated parts will be shaped. For the hood reinforcement plate 2, it is necessary to continue to shape the trimming area thereon from the first transition shape to 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 seat after the stamping separation process is completed, further, in one embodiment, the step S200, controlling the cutting knife 154 to stamp and separate the hood reinforcement plate 2 and the hood inner plate 1, that is, the stamping separation process, includes the following steps:

[0070] S210, stamping and separating the portion to be cut of the hood reinforcement plate 2, so that it is deflected and deformed in the target direction until it is completely separated from the hood inner plate 1, forming a cutting edge of a second transitional form;

[0071] During stamping separation, the hood reinforcement plate 2 is separated from the hood inner plate 1 along the connecting section.

[0072] S220, pushing the cutting edge of the hood reinforcement plate 2 in the opposite direction of the target direction to a first transitional state.

[0073] Specifically, in this embodiment, a reset component is provided below the hollow area 3131 between two to-be-cut portions of the hood reinforcement plate 2 in the cutting zone, and the cut edge of the hood reinforcement plate 2 is pushed upward by the reset component.

[0074] In this embodiment, when the cutting portion of the hood reinforcement plate 2 is stamped and separated to form the cutting edge of the second transitional form, the cutting edge in the deformed state is pressed against the side wall of the lower die seat close to the hood inner plate 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 forming the cutting edge of the second transitional form, the present application uses a reset component arranged in the lower area of ​​the second transitional form to push the hood reinforcement plate 2 in the opposite direction of the target direction to the first transitional form, see Figure 7 , so that it can be smoothly taken out after passing over the lower die seat under the hood inner panel 1, and finally the deformation degree of the to-be-cut part of the hood reinforcement plate 2 in the target direction reaches a first transition form which is lower than the second transition form.

[0075] After the hood inner panel 1 and the hood reinforcement panel 2 have been cut and separated into two independent parts, they need to be reshaped in OP40. Fig.11 , the shadow mark area of ​​the hood inner panel 1 in the figure needs to be reshaped, that is, the side of the front windshield of the hood inner panel 1 previously connected to the hood reinforcement plate 2 needs to be reshaped, but the flanges 41 to 50 have been formed in place by drawing, and the amount of reshaping is basically small. Therefore, for the hood inner panel 1, the reshaping of the shadow mark area has little effect on the final springback; but Fig.11 The ten flanges 41~50 of the middle hood reinforcement plate 241~50 need to be shaped in place at OP40, and the shaping amount is large. The large shaping amount will cause the product surface of the hood reinforcement plate 2 except the shaping areas 41~50 to have a large springback. Therefore, the springback result must take into account the influence of the shaping process. For the hood reinforcement plate 2, in order to ensure its size is qualified, the springback value after shaping must be used, and then the whole process compensation must be performed 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 separate springback results of the hood inner panel 1 or the hood reinforcement panel 2 can be analyzed. For the compensation strategy, the compensation method using the separate springback results of the hood inner panel 1 or the hood reinforcement panel 2 is as follows:

[0077] Step 1: First, compensate with the separate springback result after shaping of the hood reinforcement plate 2. 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 before, until the hood reinforcement plate 2 whose dimensional analysis meets the requirements after compensation is obtained. The above is the first compensation step; in 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: Based on the new 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 separate springback compensation on the hood inner panel 1 based on this springback result, using 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, the stamping finite element simulation software is used 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 need 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 separately based on the new compensated profile of each process in the second step.

[0080] However, since the profile after the second step compensation is different from the profile after the first step 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 is completed. Therefore, the rebound result of the hood reinforcement plate 2 after the second step compensation is inevitably different from the rebound result after the first step compensation. It may be necessary to repeat 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, 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, performing a springback compensation analysis on the integral profile formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 6060, and determining a springback compensation scheme 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 scheme.

[0085] In this solution, the two parts are considered as a whole for full process compensation during 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. Fig.12 As shown, the present scheme 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, and regards the two separate parts as a whole, and conducts comprehensive springback 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 subjected to shaping, that is, this virtual connection area 60 is basically not affected by the shaping, and its width is as narrow as possible. Therefore, in the present embodiment, it is preferably in 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, and there is no shaping content on the hood reinforcement plate 2, 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 as a whole.

[0087] However, before officially starting the springback compensation, it is necessary to determine which clamping state's springback result to use for compensation. Generally, since all parts clamped at RPS points are over-constrained and cannot reflect the actual springback of the parts, compensation is generally not recommended. The free springback of parts in an unclamped state does not consider gravity and is not clamped, so it is significantly different from the actual measurement and is not recommended for compensation.

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

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

[0090] Among them, the principles for selecting clamping points include at least the free rebound value of the clamping area, the stability of the rebound value, 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 overall number of clamping points.

[0091] Specifically, in this solution, the hood inner panel 1 and the hood reinforcement panel 2 are connected by a virtual connection area 60, and the minimum clamping points are selected as a whole, and the springback result under the minimum clamping solution is used for springback compensation. The principle of selecting the minimum clamping point is as follows:

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

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

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

[0095] 4. Choose a part 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. Don’t be 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 satisfying the above principles, the minimum clamping point of the present solution requires that the rebound result of the hood inner panel 1 alone at the minimum clamping point should 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 should also 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 the hood inner panel 1 and the hood reinforcement panel 2, which are regarded as a whole, are subjected to a rebound analysis based on the clamping scheme, and obtaining a second rebound result of the hood inner panel 1 after a rebound analysis is performed on the hood inner panel 1 alone at the same clamping point; 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 the hood inner panel 1 and the hood reinforcement plate 2 regarded as a whole are subjected to a rebound analysis based on the clamping scheme, and obtaining a fourth rebound result of the hood reinforcement plate 2 after a rebound analysis is performed on the hood reinforcement plate 2 alone at the same clamping point; judging whether the 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 is not met 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 springback 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 taken 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 according to 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 springback compensation scheme meets the preset size requirement after the springback compensation scheme shapes the integral profile formed by the hood inner panel 1 and the hood reinforcement panel 2 through the virtual connection area 60;

[0108] S324: If not satisfied, 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 springback 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 construction will be carried out in the external CAD software according to 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 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 Figure 6-Figure 10 , the stamping die comprises:

[0113] An upper die holder 152 including a cutting knife 154 that can move up and down in the vertical direction;

[0114] A lower die base is provided with a cutting area directly below the cutting knife 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 on the cutting area, and the connecting section is aligned with the edge of the cutting area;

[0115] A reset assembly is arranged in the cutting area, and comprises a top block 111 which can move up and down, and the top block 111 is used to push the cutting edge of the to-be-cut portion 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 in which the cutting blade 154 punches downward to separate the portion to be cut, after the top column 151 presses down the top block 111 and compresses the elastic reset member, the cutting blade 154 contacts the portion to be cut again.

[0118] Specifically, in this embodiment, a cutting knife 154, a pressure plate 150, and a nitrogen cylinder 153 are provided on the upper die base 152. A push column 151 is provided on the pressure plate 150. The pressure plate 150 is also provided with a limit position to ensure that it can be pushed out of the upper die base 152 for a certain stroke 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 to-be-cut parts of the cutting zone. Correspondingly, a round 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 a raised state, and its upper surface is in contact with the lower surface of the product. The pressing plate 150 is in an ejected state under the action of the nitrogen cylinder 153. As the upper die seat 152 moves downward, the pressing plate 150 first presses the sheet material and Figure 6 and Fig. 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 down 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 seat 152 moves upward, the pressing plate 150 finally separates from the lower die seat, the spring 114 begins to release, and the top block 111 is pushed out until the top 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 the cross-sectional views of the stamping die CC section before and after closing and the axial view of the ejector block 111 assembly. It can be seen from the figure that before the die is closed, the spring 114 is in the released state, and the support and the ejector block 111 are ejected to their upper dead center. At this time, the stop block 112 fixed on the lower die seat is in contact with the protrusion on one side of the ejector 113, that is, the stop gap 116 is zero, and the ejector block 111 is in contact with the bottom surface of the sheet. As the upper die seat 152 moves downward, the ejector column 151 begins to contact the ejector block 111, compressing the spring 114 to the lower dead center, ensuring that the ejector block 111 is 20mm away from the sheet. At this time, the stop block 112 and the ejector 113 have a stop gap of 20mm; after closing and cutting, the die moves upward, 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 to prevent the hood reinforcement plate 2 from being stuck in the cutting edge of the punch 110 after being cut, resulting in the problem of being unable to remove the parts.

[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 the 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 function.

[0124] Reference Fig.13 , Fig.13 The hardware structure diagram of the punching equipment of the hood inner panel with integrated hood reinforcement plate involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the punching equipment of 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, the memory, and the communication interface.

[0126] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to realize the interconnection of devices inside the punching equipment of the hood inner panel of the integrated hood reinforcement plate, and an interface used to realize the interconnection between the punching equipment of the hood inner panel of the integrated hood reinforcement plate and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), 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, which may call the stamping program of the hood inner panel of the integrated hood reinforcement plate stored in the memory, and execute the stamping method of the hood inner panel of the integrated hood reinforcement plate provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the stamping program of the hood inner panel of the integrated hood reinforcement plate is called may refer to the various embodiments of the stamping method of the hood inner panel of the integrated hood reinforcement plate of the present application, which will not be repeated here.

[0129] Those skilled in the art will understand that Fig.13 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[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 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.

[0132] Among them, the method implemented when the stamping procedure of the hood inner panel of the integrated hood reinforcement plate is executed can refer to the various embodiments of the stamping method of the hood inner panel of the 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 only for description 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 "first", "second" and "third" to different types.

[0135] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed 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 a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially 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, disk, CD) as described above, and includes a number of instructions for 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 are not intended to 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 method for stamping a hood inner panel with an integrated hood reinforcement plate, characterized in that: The stamping method of the hood inner panel of the integrated hood reinforcement plate comprises: Obtain an integrally connected hood reinforcement plate and hood inner plate; wherein the edge of the hood reinforcement plate closest to the to-be-cut portion of the hood inner plate is integrally connected to the front windshield side of the hood inner plate to form a zero-distance connected connection section; Controlling the cutting blade to punch and separate the hood reinforcement plate and the hood inner plate; wherein, during the punching and separation process, the cutting blade all falls on the hood reinforcement plate, and while punching and separating the two, the cutting edge of the to-be-cut portion is pushed to deform in the target direction to a first transitional form; The hood inner panel and the hood reinforcement panel are shaped and separated; wherein the cutting edge of the to-be-cut portion continues to deform from the first transition shape to the target direction to the target shape during the shaping process.

2. The method for punching a hood inner panel with an integrated 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 to-be-cut portion, so that it is deflected and deformed in the target direction until it is completely separated from the hood inner panel, thereby forming a cutting edge of a second transitional form; The cutting edge of the to-be-cut portion is pushed in the opposite direction of the target direction to a first transitional state.

3. The method for stamping a hood inner panel with an integrated hood reinforcement plate according to claim 1, characterized in that: The hood inner panel and the hood reinforcement panel after shaping and separation include 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 panel through the virtual connection area, and determining a springback compensation scheme for the hood inner panel and the hood reinforcement panel during the shaping process; According to the rebound compensation scheme, the hood inner panel and the hood reinforcement panel are compensated.

4. The method for punching a hood inner panel with an integrated 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 scheme for the hood inner panel and the hood reinforcement plate during the shaping process, the following steps are included: According to the preset clamping point selection principle, a clamping scheme for clamping the hood inner panel and the hood reinforcement panel regarded as a whole is determined.

5. The method for stamping a hood inner panel with an integrated hood reinforcement plate as claimed in claim 4, characterized in that: 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 stamping a hood inner panel with an integrated hood reinforcement plate according to claim 5, characterized in that: After determining the clamping scheme for clamping the hood inner panel and the hood reinforcement panel as a whole according to the preset clamping point selection principle, the following steps are included: Obtaining a first rebound result of the area where the hood inner panel is located after the hood inner panel and the hood reinforcement panel, which are considered as a whole, are subjected to a rebound analysis based on the clamping scheme, and obtaining a second rebound result after the hood inner panel is subjected to a rebound analysis at the same clamping point alone; determining whether an error between the first rebound result and the second rebound result meets a preset first error threshold requirement; Obtaining a third springback result of the area where the hood reinforcement plate is located after the hood inner panel and the hood reinforcement plate, which are considered as a whole, are subjected to springback analysis based on the clamping scheme, and obtaining a fourth springback result after the hood reinforcement plate is subjected to springback analysis alone at the same clamping point; determining whether an error between the third springback result and the fourth springback 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 simultaneously meet the first error threshold requirement and the second error threshold requirement.

7. The method for stamping a hood inner panel with an integrated hood reinforcement plate as claimed in claim 3, characterized in that: The method 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 the springback compensation effect after the springback compensation scheme shapes the integral profile formed by the hood inner panel and the hood reinforcement panel through the virtual connection area meets the preset size requirements; If not, the springback compensation scheme is optimized to meet the preset size requirement according to the springback compensation effect and the preset size requirement.

8. A stamping die for implementing the stamping method of the hood inner panel of the integrated hood reinforcement plate as claimed in any one of claims 1 to 7, characterized in that: The stamping die comprises: An upper die base including a cutting knife that can move up and down in a vertical direction; A lower die base is provided with a cutting area directly below the cutting knife; and when the integrally connected hood reinforcement plate and hood inner plate are placed on the lower die base, the portion to be cut of the hood reinforcement plate is suspended on the cutting area, and the connecting section is aligned with the edge of the cutting area; A reset assembly is arranged 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 to-be-cut portion deformed to the second transitional form upward to the first transitional form.

9. The punching device for the hood inner panel integrated with the hood reinforcement plate according to claim 8, characterized in that: The upper die base is also provided with a top column, the top column is vertically positioned 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 knife 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 knife 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 in 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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