A method and device for correcting the springback of a crankshaft oil seal skeleton during stamping

Abstract

The present invention discloses a method and device for correcting the springback of a crankshaft oil seal skeleton during stamping. The method comprises: determining the springback deformation and distribution of the crankshaft oil seal skeleton by using a stamping forming simulation method; determining the main compensation surface and the optimal compensation coefficient according to the springback deformation and distribution; completing the punching, flanging, pressing, trimming and drawing forming processes of the crankshaft oil seal skeleton during stamping forming; determining the compensation profile and inclination angle of the correction profile boss of the correction device according to the optimal compensation coefficient, and by correcting the height of the screw in the correction device, the correction screw cooperates with the clamping and fixing device and the correction profile boss to achieve accurate correction of the workpiece; completing the stamping of the positioning hole and flanging of the workpiece. The device comprises a clamping and fixing device, a positioning device, a correction profile boss and a correction screw.

Description

Technical Field

[0001] The invention relates to the technical field of stamping production, and in particular to a stamping springback correction method and device for an automobile crankshaft oil seal skeleton. Background Art

[0002] The automobile crankshaft oil seal skeleton is an important component of the engine. Its main function is to seal the crankshaft and the crankcase of the engine to prevent engine oil leakage and prevent sand, dust and other pollutants from entering the engine. It plays a vital role in preventing oil leakage and protecting the internal environment of the engine. Its forming quality affects the life and performance of the automobile engine to a certain extent. In order to achieve good sealing performance, the flatness of the workpiece is very high. In traditional production, the automobile crankshaft oil seal skeleton generally adopts the method of casting and then cutting to ensure good flatness, but this also leads to problems such as excessive weight of the workpiece and low production efficiency. With the rapid development of the intelligent manufacturing industry, automobile production is constantly developing in the direction of lightweight. Whether in terms of production efficiency or quality, the quality requirements for automobile crankshaft oil seal skeletons have been significantly improved, especially the requirements for workpiece weight and flatness. Therefore, the production of crankshaft oil seal skeletons adopts stamping with higher production efficiency to play a role in weight reduction and meet the requirements of automobile lightweighting. However, due to the small thickness of the sheet material of the crankshaft oil seal cover formed by stamping, defects such as wrinkling, cracking, and insufficient forming are prone to occur during stamping, and the workpiece has a large rebound after forming, the dimensional accuracy is low, and the forming quality is difficult to control. Therefore, it is particularly important to develop a stamping rebound correction method for automobile crankshaft oil seal skeletons to solve the flatness problem caused by rebound in actual production. It can be adaptively adjusted for plates with different mechanical performance parameters and is suitable for different types of automobile crankshaft oil seal skeletons.

[0003] The existing stamping springback control method mainly compensates the molding die surface, that is, the stamping springback compensation method. Using this method to control the automobile crankshaft oil seal skeleton requires surface processing of the molding die surface, and multiple mold repairs and adjustments are required during mass production, which increases processing costs and production cycles; it is impossible to quickly adapt to the problem of different mechanical performance parameters caused by different batches of plates, and it is not universal for different types of automobile crankshaft oil seal skeletons, and it cannot be reused, which cannot reduce production costs and improve workpiece production efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a method and device for correcting the stamping rebound of an automobile crankshaft oil seal skeleton.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for correcting the springback of a crankshaft oil seal skeleton during stamping, the method using the following correction device:

[0007] It includes a clamping and fixing device, a positioning device, a correction profile boss and a correction screw;

[0008] The clamping and fixing device is located at the center of the correction device and is used to apply fixing pressure to ensure that the workpiece can be firmly fixed on the correction device;

[0009] The positioning device is used for accurately positioning the workpiece to be corrected during the correction process;

[0010] The correction profile boss includes a compensation profile and an inclination angle to accommodate the correction of the workpiece;

[0011] The correction screw is used in conjunction with the clamping and fixing device and the correction profile boss to correct the workpiece through the action force;

[0012] The method comprises:

[0013] A process stamping simulation method is used to determine the springback deformation and distribution of the automobile crankshaft oil seal skeleton;

[0014] B. Determine the main compensation surface and the optimal compensation coefficient according to the springback deformation amount and distribution;

[0015] C completes the punching, flanging, pressing, trimming and drawing processes of the automobile crankshaft oil seal skeleton stamping;

[0016] D. Determine the compensation profile and inclination angle of the correction profile boss of the correction device according to the optimal compensation coefficient, and make the correction screw cooperate with the clamping fixture and the correction profile boss by correcting the height of the screw in the correction device to achieve accurate correction of the workpiece;

[0017] E. Complete the punching of the positioning holes and the flanging of the workpiece;

[0018] In A, a full-process stamping forming simulation method is used to determine the springback deformation and distribution of the crankshaft oil seal skeleton. The full-process stamping forming simulation refers to importing the mechanical property parameters of different batches of plates into Autoform, performing forming simulation for each step, adding a springback simulation process after the workpiece completes the shaping process simulation, and setting it to free springback. The engineering stage is set to FV for simulation, and the finite element model of the crankshaft oil seal cover of the automobile is used as the reference geometric benchmark for normal displacement. The normal displacement deviation between the final workpiece and the original part model is analyzed, which is the springback deformation;

[0019] In B, the determination of the optimal compensation coefficient includes:

[0020] According to the full-process stamping springback simulation, by comparing the springback deformation of the workpiece after completing each step, it is determined that the springback effect of the drawing process on the workpiece is the greatest among all the processes;

[0021] The die surface of the drawing process is selected for springback compensation. The compensation die surface is divided into two areas: fixed compensation area and direct compensation area. The convex surface in the die surface is selected as the fixed compensation area, and the non-convex surface in the die surface is selected as the direct compensation area.

[0022] By adjusting the compensation coefficient in the Autoform springback compensation function, multiple full-process stamping springback simulations are performed. When the simulated springback amount of the final flanging process of the workpiece meets the allowable requirements of the workpiece, the compensation coefficient is the optimal compensation coefficient.

[0023] Furthermore, the stamping process of the automobile crankshaft oil seal skeleton also includes punching, trimming and flanging, and shaping and flanging.

[0024] Further, according to the optimal compensation coefficient, the drawing profile after springback compensation is compared with the original reference surface to analyze the compensated surface characteristics, and the compensation profile and inclination angle of the correction profile boss of the correction device are determined according to the compensated surface characteristics;

[0025] The normal deviation value between the springback-compensated molding surface and the original reference surface is converted into the height of the springback correction device stud pressing down, and the correction screw is rotated to adjust the height to achieve accurate correction of the workpiece springback after the drawing process.

[0026] Furthermore, the correction device corrects the profile of the workpiece after drawing by closing the upper and lower dies to correct the process with the greatest impact of springback.

[0027] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0028] The springback problem of automobile crankshaft oil seal frame stamping was solved by a special springback correction device, so that the flatness of the product can be guaranteed;

[0029] The springback correction device can quickly adapt to plates with different mechanical property parameters during production. It is also suitable for different types of automobile crankshaft oil seal skeletons to control the springback amount, significantly reduce the number of mold repairs and adjustments, improve workpiece production efficiency, and further ensure the workpiece flatness quality.

[0030] Furthermore, the clamping and fixing device is fixed at the center of the upper die base and the lower die base, and the upper die base moves downward, and the clamping and fixing device is closed to fix the workpiece;

[0031] The positioning device is fixed to the upper left corner of the lower die base;

[0032] The correcting profile boss is fixed on the lower die base and is located in front and behind the clamping and fixing device.

[0033] Furthermore, the correction profile boss includes a front correction boss and a rear correction boss, the top of the front correction boss has a conical surface with three inclined surfaces; the two ends of the top surface of the rear correction boss have inclined surfaces, and the middle part is a compensation plane with steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of the method for correcting the springback of a crankshaft oil seal skeleton punched by the present invention;

[0035] Figure 2 This is a stamping process diagram of the automobile crankshaft oil seal skeleton of the present invention;

[0036] Figure 3 It is a diagram of a device for correcting the springback of a crankshaft oil seal frame stamping.

[0037] Figure 4 This is a product diagram of an automobile crankshaft oil seal skeleton of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with embodiments and drawings.

[0039] like Figure 1 As shown, the process of the stamping springback correction method for the automobile crankshaft oil seal skeleton is shown, which includes the following steps:

[0040] Step 10 uses a process stamping simulation method to determine the rebound deformation and distribution of the automobile crankshaft oil seal skeleton;

[0041] Step 20: determining the main compensation surface and the optimal compensation coefficient according to the springback deformation amount and distribution;

[0042] Step 30 completes the punching, flanging, pressing, trimming and drawing processes of the automobile crankshaft oil seal skeleton stamping forming;

[0043] Step 40 determines the compensation profile and inclination angle of the correction profile boss of the correction device according to the optimal compensation coefficient, and by correcting the height of the screw in the correction device, the correction screw is matched with the clamping and fixing device and the correction profile boss to achieve accurate correction of the workpiece springback after the drawing process.

[0044] In the above step 10, the full-process stamping springback simulation is performed. The mechanical property parameters of different batches of plates are imported into Autoform, and forming simulation is performed for each step. After the workpiece completes the shaping process simulation, the springback simulation process is added and set to free springback. The engineering stage is set to FV for simulation, and the finite element model of the automobile crankshaft oil seal cover is used as the reference geometric benchmark for the normal displacement. The normal displacement deviation between the final workpiece and the original part model, that is, the springback deformation, is analyzed.

[0045] In the above step 20, according to the full-process stamping springback simulation, by comparing the springback deformation of the workpiece after each step, it is determined that the springback effect of the drawing process on the workpiece is the largest among all processes, and the drawing process die surface is selected for springback compensation. The compensation die surface is divided into two areas: a fixed compensation area and a direct compensation area. The boss surface in the die surface is used as the fixed compensation area, and the remaining die surface areas of this process are selected as direct compensation areas. By adjusting the compensation coefficient in the Autoform springback compensation function, multiple full-process stamping springback simulations are performed. When the simulated springback amount of the final flanging process of the workpiece meets the workpiece permit requirements, the compensation coefficient is determined to be the optimal compensation coefficient. According to the optimal compensation coefficient, the drawing surface after springback compensation is compared with the original reference surface to analyze the compensated surface features, and the correction device's correction surface boss compensation surface and inclination angle are determined; the normal deviation value of the springback compensation surface and the original reference surface is converted into the height of the springback correction device stud pressing down, and the correction screw is rotated to adjust the height to achieve accurate correction of the workpiece springback after the drawing process.

[0046] The stamping forming process of the automobile crankshaft oil seal cover includes: ① OP10 punching and flanging; ② OP20 pressing; ③ OP30 trimming; ④ OP40 drawing; ⑤ OP50 punching; ⑥ OP60 trimming and flanging; ⑦ OP70 shaping and flanging (such as Figure 2 as shown).

[0047] The correction device corrects the workpiece profile after drawing by closing the upper and lower dies to correct the process with the greatest impact of springback and ensure that the flatness of the final product is within the permitted range.

[0048] like Figure 3 and Figure 4 As shown, this embodiment also provides a device for correcting the stamping rebound of an automobile crankshaft oil seal skeleton, comprising: a pressing and fixing device 1, a positioning device 2, a correcting profile boss 3 and a correcting screw 4;

[0049] The clamping and fixing device is located at the center of the correction device and is used to apply fixing pressure to ensure that the workpiece can be firmly fixed on the correction device; the positioning device, in this embodiment, adopts a positioning pin, but is not limited to this; it is used to accurately position the workpiece to be corrected during the correction process; the correction surface boss includes a front correction boss 31 and a rear correction boss 32, the top of the front correction boss 31 has a conical surface with three inclined surfaces, and the two ends of the top surface of the rear correction boss 32 have inclined surfaces, and the middle part is a compensation plane with steps to accommodate the correction of the workpiece; the correction screw is used in conjunction with the clamping and fixing device and the correction surface boss to correct the workpiece through the applied force.

[0050] The clamping and fixing device is fixed at the center of the upper die base and the lower die base. When the upper die base moves downward, the clamping and fixing device closes to fix the workpiece. The positioning device is fixed at the upper left corner of the lower die base. The correcting profile boss is fixed on the lower die base and is located in front and behind the clamping and fixing device.

[0051] Although the embodiments disclosed in the present invention are as above, the above contents are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A method for correcting the springback of a crankshaft oil seal skeleton, characterized in that: The correction device used in the method includes: a pressing and fixing device, a positioning device, a correction profile boss and a correction screw; The clamping and fixing device is located at the center of the correction device and is used to apply fixing pressure to ensure that the workpiece can be firmly fixed on the correction device; The positioning device is used for accurately positioning the workpiece to be corrected during the correction process; The correction profile boss has a compensation profile and an inclination angle to adapt to the correction of the workpiece; The correction screw is used in conjunction with the clamping and fixing device and the correction profile boss to correct the workpiece through the action force; Wherein: the clamping and fixing device is fixed at the center of the upper die base and the lower die base, and when the upper die base moves downward, the clamping and fixing device is closed to fix the workpiece; The positioning device is fixed to the upper left corner of the lower die base; The correcting profile boss is fixed on the lower die base and is located in front and behind the clamping and fixing device; The method comprises: A uses a full-process stamping simulation method to determine the springback deformation and distribution of the crankshaft oil seal skeleton of the automobile; the stamping process of the crankshaft oil seal skeleton of the automobile includes: punching and flanging, pressing, trimming, drawing, punching, trimming and flanging, and shaping and flanging; B. Determine the main compensation surface and the optimal compensation coefficient according to the springback deformation amount and distribution; C completes the punching, flanging, pressing, trimming and drawing processes of the automobile crankshaft oil seal skeleton stamping; D. Determine the compensation profile and inclination angle of the correction profile boss of the correction device according to the optimal compensation coefficient, and make the correction screw cooperate with the clamping fixture and the correction profile boss by correcting the height of the correction screw in the correction device to achieve accurate correction of the springback of the workpiece after the drawing process; E. Complete the punching of the positioning holes and the flanging of the workpiece; The full-process stamping forming simulation in A refers to importing the mechanical property parameters of different batches of plates into Autoform, performing forming simulation for each step of the process, adding a springback simulation process after the workpiece completes the shaping process simulation, and setting it to free springback, setting the engineering stage to FV for simulation, using the finite element model of the automobile crankshaft oil seal cover as the reference geometric benchmark for normal displacement, analyzing the normal displacement deviation between the final workpiece and the original part model, that is, the springback deformation; In B, the determination of the optimal compensation coefficient includes: According to the full-process stamping springback simulation, by comparing the springback deformation of the workpiece after completing each step, it is determined that the springback effect of the drawing process on the workpiece is the greatest among all the processes; The die surface of the drawing process is selected for springback compensation. The compensation die surface is divided into two areas: fixed compensation area and direct compensation area. The convex surface in the die surface is selected as the fixed compensation area, and the non-convex surface in the die surface is selected as the direct compensation area. By adjusting the compensation coefficient in the Autoform springback compensation function, multiple full-process stamping springback simulations are performed. When the simulated springback amount of the final flanging process of the workpiece meets the allowable requirements of the workpiece, the compensation coefficient is the optimal compensation coefficient.

2. The method for correcting the stamping rebound of the automobile crankshaft oil seal skeleton according to claim 1, characterized in that: According to the optimal compensation coefficient, the drawing profile after springback compensation is compared with the original reference surface to analyze the compensated surface characteristics, and the compensation profile and inclination angle of the correction profile boss of the correction device are determined according to the compensated surface characteristics; The normal deviation value between the springback-compensated molding surface and the original reference surface is converted into the height of the springback correction device's correction screw, and the correction screw is rotated to adjust the height, thereby achieving precise correction of the workpiece springback after the drawing process.

3. The method for correcting the stamping rebound of the automobile crankshaft oil seal skeleton according to claim 1, characterized in that: The correction device corrects the profile of the workpiece after drawing by closing the upper and lower dies, so as to correct the process with the greatest impact of springback.

4. The method for correcting the stamping rebound of the automobile crankshaft oil seal skeleton according to claim 1, characterized in that: The correction profile boss comprises a front correction boss and a rear correction boss. The top of the front correction boss has a conical surface with three inclined surfaces; the two ends of the top surface of the rear correction boss have inclined surfaces, and the middle part is a compensation plane with steps.

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