A method for preparing a high-strength automobile axle housing

Abstract

The application relates to the field of automobile axle housing preparation, in particular to a high-strength automobile axle housing preparation method. The application obtains a target stamping model, identifies a plurality of deformation regions of the target stamping model, performs stress propagation analysis based on the deformation regions, constructs a plurality of virtual propagation regions based on the edge contours of the deformation regions, determines a stress propagation sensitive region according to the superposition of the virtual propagation regions, calculates a stress propagation interference coefficient based on a plurality of recess morphological features corresponding to the stress propagation sensitive region, judges the stress propagation interference category of a stamping process, stamps the stamping part based on the stress propagation interference category, prepares an axle housing component, reduces the influence of stress propagation interference around the deformation region in the axle housing preparation process on the quality of the axle housing, reduces the irreversible deformation and abnormal strength of the axle housing, and guarantees the quality of the axle housing.

Description

Technical Field

[0001] This invention relates to the field of automotive axle housing manufacturing, and more particularly to a method for manufacturing a high-strength automotive axle housing. Background Technology

[0002] The axle housing is a key component of the automotive drive axle. Its main functions are to support and protect the main reducer, differential, and half-shafts, transmit vehicle loads, and bear the driving force, braking force, lateral force, and torque transmitted from the drive wheels. Due to its complex load-bearing capacity and high reliability requirements, its manufacturing process is crucial. Currently, automotive axle housing components are mainly manufactured through casting or stamping processes.

[0003] For example, Chinese Patent Publication No. CN114713724A discloses a heating equipment and stamping process for high-strength steel medium-thick slabs used in automotive axle housings, relating to the field of stamping forming technology. The equipment includes a linear heating module at the axle bend of the slab and an annular heating module at the square-to-round transition area. Different models of heating modules can be replaced to adapt to different slab models. Annular and linear heating elements are installed in the annular and linear heating modules, respectively. The cross-sectional profile of the inner wall of the heating modules is elliptical, with the heating unit and the slab located at the two foci of the ellipse. The process includes: activating the circulating cooling system, activating each heating module, and implementing an atmosphere protection system and a safety monitoring system. Local heating is applied to the axle bend and the square-to-round transition area of ​​the slab. After completion, the slab is transferred to a stamping press. The equipment and the accompanying differential temperature stamping process reduce the forming pressure of medium-thick slab axle housings, prevent cracking at the aforementioned two locations during stamping, minimize mold wear, achieve a high product qualification rate, and reduce costs.

[0004] However, the following problems still exist in the existing technology. During the fabrication of bridge shells using stamping technology, the deformation area of ​​the bridge shell is actually formed under stress stamping. The material around the deformation area is thinned, the stress around the deformation area is relatively concentrated, and the stress between the deformation areas will propagate and form interference. Moreover, the stress propagation is discrete and difficult to predict accurately, which leads to some areas being relatively weak, which may result in irreversible deformation and abnormal strength, affecting the quality of the finished product. Summary of the Invention

[0005] This invention provides a method for preparing a high-strength automotive axle housing. In the prior art, when axle housings are prepared using a stamping process, the stress around the deformation area of ​​the axle housing is relatively concentrated, and the stress between the deformation areas will propagate and interfere. Furthermore, the stress propagation is discrete and difficult to predict accurately, which leads to some areas being relatively weak and potentially causing irreversible deformation and abnormal strength, thus affecting the quality of the finished product.

[0006] To achieve the above objectives, the present invention provides a method for preparing a high-strength automotive axle housing, comprising: Obtain the target stamping model and identify several deformation regions of the target stamping model; Stress propagation analysis is performed on each of the aforementioned deformation regions to extract the concave morphological features and edge contours of each deformation region. Several virtual propagation regions are constructed based on the edge contours of each deformation region, and the stress propagation sensitive region is determined based on the superposition of the virtual propagation regions. The stress propagation interference coefficient is calculated based on several concave morphological features corresponding to the stress propagation sensitive area to determine the stress propagation interference category in the stamping process. The stamping component is placed in a stamping die, and the stamping is performed based on the stress propagation interference category to prepare the bridge shell component, including... The stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient. Infrared images of the reference viewpoint are obtained during the stamping process. The stress propagation sensitive area is marked in the infrared image. The stamping process is judged to be abnormal based on the stress propagation sensitive area and the adjacent temperature profile band. Alternatively, maintain the stamping parameters to complete the stamping process; The reference viewpoint is the viewpoint parallel to the stamping direction.

[0007] Furthermore, the process of performing stress propagation analysis on each deformation region includes, Identify the edge contours of each deformed region and determine the area of ​​the edge contours; Determine the maximum depth of each deformation region; The area and maximum depth are defined as the concave morphological features; The deformation area refers to the area where the stamped part has a depression or a bulge.

[0008] Furthermore, the process of determining the stress propagation sensitive area includes, The edge contour of the deformed region is enlarged by a predetermined ratio to form the virtual propagation region; Determine the superposition area of ​​each virtual propagation area, and define the superposition area as the stress propagation sensitive area; The predetermined ratio is adjusted based on the concave morphological characteristics of the deformed region.

[0009] Furthermore, the process of calculating the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive region includes, Determine several virtual propagation regions corresponding to the stress propagation sensitive region, and determine the deformation region corresponding to each virtual propagation region; Solve for the depression morphology characteristics corresponding to each deformation region, and solve for the mean area and the mean maximum depth; Calculate the first ratio between the mean area and the preset area threshold; Calculate the second ratio between the maximum average depth and the preset depth threshold; The stress propagation interference coefficient is obtained by weighted summing of the first ratio and the second ratio.

[0010] Furthermore, the process of determining the type of stress propagation interference in the stamping process includes, If the stress propagation interference coefficient is greater than or equal to the preset stress propagation interference threshold, it is determined to be the first stress propagation interference category; If the stress propagation interference coefficient is less than the preset stress propagation interference threshold, it is determined to be the second stress propagation interference category.

[0011] Furthermore, the stamping process involves placing the stamping part in a stamping die and stamping the part based on the stress propagation interference category, including... If it is determined to be the first stress propagation interference category, the stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient, an infrared image of the reference view during the stamping process is obtained, the stress propagation sensitive area is marked in the infrared image, and the stamping process is determined to be abnormal based on the temperature profile band adjacent to the stress propagation sensitive area. If it is determined to be the second stress propagation interference category, then the stamping parameters are maintained to complete the stamping and prepare the bridge shell component.

[0012] Furthermore, adjusting the stamping speed and stamping pressure based on the stress propagation interference coefficient includes, Reducing the stamping speed results in a positive correlation between the reduction in the stress propagation interference coefficient and the amount of reduction. Increasing the stamping pressure increases the amount of material, which is positively correlated with the stress propagation interference coefficient.

[0013] Furthermore, it also includes determining the temperature profile band adjacent to the stress propagation sensitive region. The determination process includes, The edge of the stress propagation sensitive area is divided into several contour zones. The two ends of each contour zone are connected to the edge contour of the nearest deformation area with the shortest distance to form a closed area. The closed area is defined as the temperature contour zone.

[0014] Furthermore, determining whether the stamping process is abnormal based on the stress propagation sensitive area and the adjacent temperature profile zone includes: Determine the stress propagation sensitive area and the temperature change rate and temperature dispersion of each temperature profile zone during the stamping process; If the abnormal conditions are met, the stamping process is determined to be abnormal. The temperature dispersion is calculated based on the variance of the temperature in the stress propagation sensitive area and the local area in each temperature profile band. The abnormal condition is that the temperature change rate is not within the standard rate range and the temperature dispersion is greater than the predetermined temperature dispersion threshold.

[0015] Furthermore, it also includes issuing a warning signal in response to the determination that an abnormality exists in the stamping process.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention obtains a target stamping model, identifies several deformation regions of the target stamping model, performs stress propagation analysis based on each deformation region, constructs several virtual propagation regions based on the edge contours of each deformation region, determines stress propagation sensitive regions based on the superposition of virtual propagation regions, calculates stress propagation interference coefficients based on several concave morphological features corresponding to the stress propagation sensitive regions to determine the stress propagation interference category of the stamping process, and stamps the stamped part based on the stress propagation interference category to prepare bridge shell components. By adaptively optimizing process parameters, the influence of stress propagation interference around the deformation regions on the quality of the bridge shell during the bridge shell preparation process is reduced, irreversible deformation and abnormal strength bridge shells are reduced, and the quality of the bridge shell is guaranteed.

[0017] In particular, this invention determines stress propagation sensitive areas based on the superposition of virtual propagation regions. In actual bridge shells, the deformation region is formed by the force applied by the punch during the stamping process, and its deformation is mainly concentrated at the edge. More stress is released near the edge of the deformation region. Based on this, this invention constructs virtual propagation regions, and the size of the virtual propagation regions is determined based on the concave morphological characteristics of the deformation regions to adaptively characterize the stress propagation around different deformation regions. Since there may be multiple deformation regions in the bridge shell, each deformation region will generate stress. After the stress propagates discretely, it interferes with each other, and there are sensitive areas with strong interference. Therefore, this invention determines the regions with relatively concentrated stress and strong interference by superimposing virtual propagation regions. Due to the discreteness and unpredictability of stress propagation, such regions may have abnormal deformation or low strength bridge shells during the stamping process. Therefore, identifying stress propagation sensitive areas facilitates the subsequent determination of the stress propagation interference type in the stamping process, timely intervention in process parameters, and thus reduces the impact of stress propagation interference around the deformation regions on the bridge shell quality during the bridge shell manufacturing process, reduces irreversible deformation and abnormal strength bridge shells, and ensures the quality of the bridge shell.

[0018] In particular, this invention calculates the stress propagation interference coefficient based on the morphological characteristics of several depressions corresponding to the stress propagation sensitive area. For the stress propagation sensitive area, it is actually the result of the superposition of virtual propagation areas. Therefore, considering the depression morphological characteristics of the deformation area corresponding to the virtual propagation area, in reality, the larger the area and the deeper the depth, the greater the deformation. The stress propagation and concentration phenomena at the edge of the deformation area are more intense. Based on this, considering the superposition effect of each deformation area on the stress propagation sensitive area, the stress propagation interference coefficient is calculated through the depression morphological characteristics of each deformation area to characterize the stress concentration situation of the stress propagation sensitive area under the interference of multiple stresses. Then, the stress propagation interference category of the stamping process is determined, and the process parameters are adjusted adaptively to reduce the impact of stress propagation interference around the deformation area on the quality of the bridge shell during the bridge shell preparation process, reduce the bridge shell with irreversible deformation and abnormal strength, and ensure the quality of the bridge shell.

[0019] In particular, based on the stress propagation interference coefficient, the stamping speed and stamping pressure are adjusted. For the first stress propagation interference category, there are areas with multi-directional stress interference and relatively concentrated stress with strong interference. Therefore, the stamping speed is first adaptively reduced to slow down stress release. At the same time, the stamping pressure is appropriately increased to reduce the stress caused by springback. The focus is on monitoring the stress propagation sensitive area and the adjacent temperature profile band. In reality, the stress propagation sensitive area has stress concentration, which is also accompanied by micro-deformation and heat release. Since this area is affected by the stress released by multiple adjacent deformation areas, a temperature profile band is constructed to reflect whether there is a temperature anomaly, characterize the situation of excessive stress concentration, and identify stamping anomalies in a timely manner. This reduces the impact of stress propagation interference around the deformation area on the quality of the bridge shell during the bridge shell preparation process, reduces bridge shells with irreversible deformation and abnormal strength, and ensures the quality of the bridge shell. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the steps in the high-strength automotive axle housing preparation method according to an embodiment of the present invention; Figure 2 This is a logic block diagram for determining the stress propagation interference category in the stamping process according to an embodiment of the present invention; Figure 3 This is a logic block diagram of stamping a bridge shell component based on stress propagation interference category according to an embodiment of the present invention. Figure 4 This is a logic block diagram for determining whether the stamping process is abnormal according to an embodiment of the present invention. Detailed Implementation

[0021] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0022] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0024] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please see Figure 1 As shown, Figure 1 This is a schematic diagram illustrating the steps of a high-strength automotive axle housing preparation method according to an embodiment of the present invention. The high-strength automotive axle housing preparation method according to an embodiment of the present invention includes: Step S1: Obtain the target stamping model and identify several deformation regions of the target stamping model; Step S2: Perform stress propagation analysis based on each of the deformation regions to extract the concave morphological features and edge contours of each deformation region; Step S3: Construct several virtual propagation regions based on the edge contours of each deformation region, and determine the stress propagation sensitive region based on the superposition of the virtual propagation regions; Step S4: Calculate the stress propagation interference coefficient based on several indentation morphological features corresponding to the stress propagation sensitive area to determine the stress propagation interference category in the stamping process. Step S5: Place the stamping part in the stamping die, and stamp the part based on the stress propagation interference category to prepare the bridge shell component, including: The stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient. Infrared images of the reference viewpoint are obtained during the stamping process. The stress propagation sensitive area is marked in the infrared image. The stamping process is judged to be abnormal based on the stress propagation sensitive area and the adjacent temperature profile band. Alternatively, maintain the stamping parameters to complete the stamping process; The reference viewpoint is the viewpoint parallel to the stamping direction.

[0026] Specifically, the specific structure of the stamping die and the stamping equipment is not limited. Those skilled in the art can design the stamping die according to the structural requirements of the bridge housing. The stamping equipment only needs to provide stamping pressure to the stamping die to complete the stamping. All of these are existing technologies and will not be elaborated further.

[0027] Specifically, the stamped components of the bridge housing are usually sheet metal. To meet different needs, several deformation areas are formed on the sheet metal by stamping. The deformation areas are areas with depressions or protrusions.

[0028] Specifically, the target stamping model is a pre-constructed three-dimensional model, that is, the three-dimensional model corresponding to the axle housing after forming. Through the three-dimensional model, the deformation area, as well as the corresponding concave morphological features and edge contours, can be determined, which will not be elaborated further.

[0029] Specifically, there are no restrictions on the method of acquiring infrared images. The purpose of acquiring infrared images is to consider the temperature field of the stamping die. Existing infrared image acquisition equipment with strong penetration can be used, as long as it can achieve the corresponding function. This will not be elaborated further.

[0030] Specifically, the process of performing stress propagation analysis on each deformation region includes, Identify the edge contours of each deformed region and determine the area of ​​the edge contours; Determine the maximum depth of each deformation region; The area and maximum depth are defined as the concave morphological features; The deformation area refers to the area where the stamped part has a depression or a bulge.

[0031] Specifically, the process of determining the stress propagation sensitive area includes, The edge contour of the deformed region is enlarged by a predetermined ratio to form the virtual propagation region; Determine the superposition area of ​​each virtual propagation area, and define the superposition area as the stress propagation sensitive area; The predetermined ratio is adjusted based on the concave morphological characteristics of the deformed region.

[0032] This invention determines stress propagation sensitive areas based on the superposition of virtual propagation regions. In actual bridge shells, the deformation region is formed by the force applied by the punch during the stamping process, and its deformation is mainly concentrated at the edge. More stress is released near the edge of the deformation region. Based on this, this invention constructs virtual propagation regions, and the size of the virtual propagation regions is determined based on the concave morphological characteristics of the deformation regions to adaptively characterize the stress propagation around different deformation regions. Since there may be multiple deformation regions in the bridge shell, each deformation region will generate stress. After the stress propagates discretely, they interfere with each other, and there are sensitive areas with strong interference. Therefore, this invention determines the regions with relatively concentrated stress and strong interference by superimposing virtual propagation regions. Due to the discreteness and unpredictability of stress propagation, such regions may have abnormal deformation or a bridge shell with low strength during the stamping process. Therefore, identifying stress propagation sensitive areas facilitates the subsequent determination of the stress propagation interference type in the stamping process, timely intervention of process parameters, and thus reduces the impact of stress propagation interference around the deformation regions on the quality of the bridge shell during the bridge shell manufacturing process, reduces irreversible deformation and abnormal strength bridge shells, and ensures the quality of the bridge shell.

[0033] Specifically, to focus on stress propagation in the vicinity of the deformation zone, the initial predetermined ratio was set at 1.5 times.

[0034] In implementation, optional, The ratio of the area of ​​the depression morphology feature in the deformed region to the preset area threshold is calculated to obtain the first consideration factor; The ratio of the maximum depth to the preset depth threshold is calculated to obtain the second consideration factor; The weighted sum of the first and second consideration factors yields the factors for considering the concave morphological characteristics. To comprehensively consider the two factors, the weights are all 0.5 when performing a weighted summation.

[0035] If the factors considering the morphological characteristics of the depression are within the predetermined standard range, then the predetermined ratio is set as the initial predetermined ratio. If the factors considered in relation to the morphological characteristics of the depression exceed the upper limit of the predetermined standard range, the predetermined ratio will be set to 1.25 times the initial predetermined ratio. If the indentation consideration factor is less than the lower limit of the predetermined standard range, the predetermined ratio is set to 0.85 times the initial predetermined ratio.

[0036] The standard range is determined based on the stress propagation interference threshold. The standard range is an open interval, with an upper limit of 1.25 times the stress propagation interference threshold and a lower limit of 0.85 times the stress propagation interference threshold.

[0037] Specifically, the process of calculating the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive region includes, Determine several virtual propagation regions corresponding to the stress propagation sensitive region, and determine the deformation region corresponding to each virtual propagation region; Solve for the depression morphology characteristics corresponding to each deformation region, and solve for the mean area and the mean maximum depth; Calculate the first ratio between the mean area and the preset area threshold; Calculate the second ratio between the maximum average depth and the preset depth threshold; The stress propagation interference coefficient is obtained by weighted summing of the first ratio and the second ratio.

[0038] Specifically, the preset area threshold and preset depth threshold are predetermined. Several open-source target stamping models are obtained as samples in advance, the dent morphology features are extracted, the average area and the average maximum depth are solved, the preset area threshold is set as the product of the average area and the offset coefficient, and the preset depth threshold is set as the product of the average maximum depth and the offset coefficient. The offset coefficient is selected in the interval [1.05, 1.15].

[0039] When performing a weighted summation, the weights for both the first ratio and the second ratio are 0.5.

[0040] This invention calculates the stress propagation interference coefficient based on the morphological characteristics of several depressions corresponding to the stress propagation sensitive area. For the stress propagation sensitive area, it is actually the result of the superposition of virtual propagation areas. Therefore, considering the depression morphological characteristics of the deformation area corresponding to the virtual propagation area, in reality, the larger the area and the deeper the depth, the greater the deformation, and the stronger the stress propagation and concentration phenomenon at the edge of the deformation area. Based on this, considering the superposition effect of each deformation area on the stress propagation sensitive area, the stress propagation interference coefficient is calculated through the depression morphological characteristics of each deformation area to characterize the stress concentration situation of the stress propagation sensitive area under the interference of multiple stresses, and then determine the stress propagation interference category of the stamping process. Subsequently, the process parameters are adjusted adaptively to reduce the impact of stress propagation interference around the deformation area on the quality of the bridge shell during the bridge shell preparation process, reduce the bridge shell with irreversible deformation and abnormal strength, and ensure the quality of the bridge shell.

[0041] Specifically, please refer to Figure 2 As shown, Figure 2 This is a logic block diagram illustrating the determination of the stress propagation interference category during the stamping process according to an embodiment of the present invention. The process for determining the stress propagation interference category during the stamping process includes: If the stress propagation interference coefficient is greater than or equal to the preset stress propagation interference threshold, it is determined to be the first stress propagation interference category; If the stress propagation interference coefficient is less than the preset stress propagation interference threshold, it is determined to be the second stress propagation interference category.

[0042] The stress propagation interference threshold is the stress propagation interference coefficient calculated when the mean area is equal to the preset area threshold and the mean maximum depth is equal to the preset depth threshold.

[0043] Specifically, please refer to Figure 3 As shown, Figure 3 This is a logic block diagram of a stamping process for fabricating a bridge shell component based on stress propagation interference category, according to an embodiment of the present invention. Specifically, placing the stamping part in the stamping die and stamping the part based on the stress propagation interference category includes, If it is determined to be the first stress propagation interference category, the stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient, an infrared image of the reference view during the stamping process is obtained, the stress propagation sensitive area is marked in the infrared image, and the stamping process is determined to be abnormal based on the temperature profile band adjacent to the stress propagation sensitive area. If it is determined to be the second stress propagation interference category, then the stamping parameters are maintained to complete the stamping and prepare the bridge shell component.

[0044] Specifically, adjusting the stamping speed and stamping pressure based on the stress propagation interference coefficient includes, Reducing the stamping speed results in a positive correlation between the reduction in the stress propagation interference coefficient and the amount of reduction. Increasing the stamping pressure increases the amount of material, which is positively correlated with the stress propagation interference coefficient.

[0045] In implementation, optional, Set the first stress propagation interference coefficient comparison parameter and the second stress propagation interference coefficient comparison parameter; If the stress propagation interference coefficient is greater than the preset stress propagation interference threshold and less than or equal to the first stress propagation interference coefficient, then the stamping speed is reduced by 0.15 times the initial stamping speed; and the stamping pressure is increased by 0.1 times the initial stamping pressure. If the stress propagation interference coefficient is greater than the first stress propagation interference coefficient comparison parameter and less than the second stress propagation interference coefficient comparison parameter, then the reduction in stamping speed is 0.3 times the initial stamping speed, and the increase in stamping pressure is 0.2 times the initial stamping pressure. If the stress propagation interference coefficient is greater than or equal to the second stress propagation interference coefficient comparison parameter, then the reduction in stamping speed is 0.45 times the initial stamping speed, and the increase in stamping pressure is 0.3 times the initial stamping pressure.

[0046] Among them, the first stress propagation interference coefficient comparison parameter is 1.15 times the stress propagation interference threshold, and the second stress propagation interference coefficient comparison parameter is 1.3 times the stress propagation interference threshold.

[0047] Specifically, this also includes determining the temperature profile band adjacent to the stress propagation sensitive region. The determination process includes... The edge of the stress propagation sensitive area is divided into several contour zones. The two ends of each contour zone are connected to the edge contour of the nearest deformation area with the shortest distance to form a closed area. The closed area is defined as the temperature contour zone.

[0048] Specifically, the contour band is the edge of the stress propagation sensitive area. Since this area is affected by the stress released by multiple deformation areas, the stress propagation path is mainly considered by connecting the two ends of the contour band with the edge contour of the nearest deformation area through the shortest connection, and the temperature change along the corresponding path is then monitored.

[0049] Specifically, please refer to Figure 4 As shown, Figure 4 This is a logic block diagram for determining whether the stamping process is abnormal according to an embodiment of the present invention. Determining whether the stamping process is abnormal based on the stress propagation sensitive area and the adjacent temperature profile band includes... Determine the stress propagation sensitive area and the temperature change rate and temperature dispersion of each temperature profile zone during the stamping process; If the abnormal conditions are met, the stamping process is determined to be abnormal. The temperature dispersion is calculated based on the variance of the temperature in the stress propagation sensitive area and the local area in each temperature profile band. The abnormal condition is that the temperature change rate is not within the standard rate range and the temperature dispersion is greater than the predetermined temperature dispersion threshold.

[0050] Specifically, in implementation, temperature dispersion is the variance of the temperature in each local area of ​​each adjacent deformation region. The standard rate interval and temperature dispersion threshold are predetermined. Specifically, the temperature change rate and temperature dispersion of the stamping process of the qualified finished bridge housing are recorded in advance. The mean temperature change rate and the mean temperature dispersion are calculated. The temperature dispersion threshold is set as the product of the mean temperature dispersion and the error coefficient. The upper limit of the standard rate interval is set to 1.25 times the mean temperature change rate, and the lower limit of the standard rate interval is set to 0.75 times the mean temperature change rate. The standard rate interval is an open interval, and the error coefficient is selected within the interval [1.15, 1.3].

[0051] Based on the stress propagation interference coefficient, the stamping speed and stamping pressure are adjusted. For the first stress propagation interference category, there are areas with multi-directional stress interference and relatively concentrated stress with strong interference. Therefore, the stamping speed is first adaptively reduced to slow down stress release. At the same time, the stamping pressure is appropriately increased to reduce the stress caused by springback. The focus is on monitoring the stress propagation sensitive area and the adjacent temperature profile band. In reality, the stress propagation sensitive area has stress concentration, which is also accompanied by micro-deformation and heat release. Since this area is affected by the stress released by multiple adjacent deformation areas, a temperature profile band is constructed to reflect whether there is a temperature anomaly, characterize the situation of excessive stress concentration, and identify stamping anomalies in a timely manner. This reduces the impact of stress propagation interference around the deformation area on the quality of the bridge shell during the bridge shell preparation process, reduces bridge shells with irreversible deformation and abnormal strength, and ensures the quality of the bridge shell.

[0052] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength automotive axle housing, characterized in that, include: Obtain the target stamping model and identify several deformation regions of the target stamping model; Stress propagation analysis is performed on each of the aforementioned deformation regions to extract the concave morphological features and edge contours of each deformation region. Several virtual propagation regions are constructed based on the edge contours of each deformation region, and the stress propagation sensitive region is determined based on the superposition of the virtual propagation regions. The stress propagation interference coefficient is calculated based on several concave morphological features corresponding to the stress propagation sensitive area to determine the stress propagation interference category in the stamping process. The stamping component is placed in a stamping die, and the stamping is performed based on the stress propagation interference category to prepare the bridge shell component, including... If it is determined to be the first stress propagation interference category, the stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient, an infrared image of the reference view during the stamping process is obtained, the stress propagation sensitive area is marked in the infrared image, and the stamping process is determined to be abnormal based on the stress propagation sensitive area and the adjacent temperature profile band. If it is determined to be the second stress propagation interference category, then the stamping parameters are maintained to complete the stamping; The reference viewpoint is the viewpoint parallel to the stamping direction.

2. The method for preparing a high-strength automotive axle housing according to claim 1, characterized in that, The process of performing stress propagation analysis on each deformation region includes, Identify the edge contours of each deformed region and determine the area of ​​the edge contours; Determine the maximum depth of each deformation region; The area and maximum depth are defined as the concave morphological features; The deformation area refers to the area where the stamped part has a depression or a bulge.

3. The method for preparing a high-strength automotive axle housing according to claim 1, characterized in that, The process of determining the stress propagation sensitive area includes, The edge contour of the deformed region is enlarged by a predetermined ratio to form the virtual propagation region; Determine the superposition area of ​​each virtual propagation area, and define the superposition area as the stress propagation sensitive area; The predetermined ratio is adjusted based on the concave morphological characteristics of the deformed region.

4. The method for preparing a high-strength automotive axle housing according to claim 3, characterized in that, The process of calculating the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive region includes: Determine several virtual propagation regions corresponding to the stress propagation sensitive region, and determine the deformation region corresponding to each virtual propagation region; Solve for the depression morphology characteristics corresponding to each deformation region, and solve for the mean area and the mean maximum depth; Calculate the first ratio between the mean area and the preset area threshold; Calculate the second ratio between the maximum average depth and the preset depth threshold; The stress propagation interference coefficient is obtained by weighted summing of the first ratio and the second ratio.

5. The method for preparing a high-strength automotive axle housing according to claim 4, characterized in that, The process of determining the type of stress propagation interference in the stamping process includes, If the stress propagation interference coefficient is greater than or equal to the preset stress propagation interference threshold, it is determined to be the first stress propagation interference category; If the stress propagation interference coefficient is less than the preset stress propagation interference threshold, it is determined to be the second stress propagation interference category.

6. The method for preparing a high-strength automotive axle housing according to claim 1, characterized in that, Adjusting stamping speed and stamping pressure based on stress propagation interference coefficient includes: Reducing the stamping speed results in a positive correlation between the reduction in the stress propagation interference coefficient and the amount of reduction. Increasing the stamping pressure increases the amount of material, which is positively correlated with the stress propagation interference coefficient.

7. The method for preparing a high-strength automotive axle housing according to claim 1, characterized in that, It also includes determining the temperature profile band adjacent to the stress propagation sensitive region. The determination process includes, The edge of the stress propagation sensitive area is divided into several contour zones. The two ends of each contour zone are connected to the edge contour of the nearest deformation area with the shortest distance to form a closed area. The closed area is defined as the temperature contour zone.

8. The method for preparing a high-strength automotive axle housing according to claim 7, characterized in that, Determining whether the stamping process is abnormal based on the stress propagation sensitive area and the adjacent temperature profile zone includes: Determine the stress propagation sensitive area and the temperature change rate and temperature dispersion of each temperature profile zone during the stamping process; If the abnormal conditions are met, the stamping process is determined to be abnormal. The temperature dispersion is calculated based on the variance of the temperature in the stress propagation sensitive area and the local area in each temperature profile band. The abnormal condition is that the temperature change rate is not within the standard rate range and the temperature dispersion is greater than the predetermined temperature dispersion threshold.

9. The method for preparing a high-strength automotive axle housing according to claim 1, characterized in that, It also includes issuing a warning signal in response to the determination that there is an abnormality in the stamping process.

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