Preparation method of high-strength automobile axle housing

Abstract

Relates to the field of automobile axle housing preparation, in particular to a high-strength automobile axle housing preparation method which comprises the steps that a target stamping model is obtained, a plurality of deformation areas of the target stamping model are recognized, stress propagation analysis is conducted on the basis of the deformation areas, and a plurality of virtual propagation areas are constructed on the basis of the edge contours of the deformation areas; a stress propagation sensitive area is determined according to superposition of the virtual propagation areas, a stress propagation interference coefficient is calculated based on a plurality of concave morphological characteristics corresponding to the stress propagation sensitive area so as to judge the stress propagation interference type in the stamping process, stamping is conducted on the stamping part based on the stress propagation interference type, and the axle housing component is prepared. By adaptively optimizing process parameters, the influence of stress propagation interference around a deformation area on the quality of the axle housing in the axle housing preparation process is reduced, the axle housing with irreversible deformation and abnormal strength is reduced, and the quality of the axle housing is ensured.

Description

Technical Field

[0001] The invention relates to the field of automobile axle housing preparation, and in particular to a method for preparing a high-strength automobile axle housing. Background Art

[0002] The automobile axle housing is a key component of the automobile drive axle. Its main function is to support and protect the main reducer, differential and half-axles, transmit vehicle loads, and withstand the driving force, braking force, lateral force and torque transmitted by the drive wheels. Due to its complex load-bearing and high reliability requirements, its preparation process is crucial. At present, automobile axle housing components are mainly prepared by casting or stamping processes.

[0003] For example, Chinese Patent Publication No. CN114713724A discloses a heating equipment and stamping process for medium-thick high-strength steel slabs for automobile axle shells, which relates to the field of stamping forming technology. The equipment includes a linear heating module at the bridge bend of the slab and an annular heating module at the square-circle transition. Different types of heating modules can be replaced to adapt to different types of slabs; annular and linear heating elements are installed in the annular heating module and the linear heating module respectively. The cross-sectional profile of the inner wall of the heating module is elliptical, and the heating unit and the slab are respectively located at the two foci of the ellipse. The process includes: turning on the circulating cooling system, turning on each heating module, the atmosphere protection system and the safety monitoring system, and locally heating the bridge bend and the square-circle transition of the slab. After completion, the slab is transferred to the stamping machine. The equipment and the supporting differential temperature stamping process reduce the forming pressure of the medium-thick plate axle shell, prevent cracking at the above two locations during the stamping process, reduce mold wear, and have a high product qualification rate and low cost.

[0004] However, the prior art still has the following problems:

[0005] During the preparation of the bridge shell using the stamping process, 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 to form interference. In addition, the stress propagation is discrete and difficult to predict accurately, which leads to some areas being relatively weak, and irreversible deformation and strength abnormalities may occur, affecting the quality of the finished product. Summary of the Invention

[0006] The present invention provides a method for preparing a high-strength automobile bridge shell, which is designed to solve the problem in the existing technology that, during the preparation of the bridge shell by a stamping process, the stress around the deformation area of ​​the bridge shell is relatively concentrated, and the stress between the deformation areas will propagate to form interference. In addition, the stress propagation is discrete and difficult to accurately predict, which leads to some areas being relatively weak, and irreversible deformation and abnormal strength may occur, affecting the quality of the finished product.

[0007] To achieve the above object, the present invention provides a method for preparing a high-strength automobile axle housing, which comprises:

[0008] Acquire a target stamping model and identify several deformation regions of the target stamping model;

[0009] Performing stress propagation analysis based on each of the deformed regions to extract concave morphological features and edge contours of each deformed region;

[0010] Based on the edge contours of each deformation area, several virtual propagation areas are constructed, and the stress propagation sensitive area is determined by superposition of the virtual propagation areas;

[0011] 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 type of the stamping process;

[0012] The stamping original part is placed in the stamping die, and the stamping part is stamped based on the stress propagation interference category to prepare the bridge shell component, including:

[0013] The stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the reference angle during the stamping process is acquired. The stress propagation sensitive area is calibrated in the infrared image. The stress propagation sensitive area and the adjacent temperature contour band are used to determine whether the stamping process is abnormal.

[0014] Or, maintain the stamping parameters and complete the stamping;

[0015] The reference viewing angle is the viewing angle parallel to the punching direction.

[0016] Furthermore, the process of stress propagation analysis for each deformation area includes:

[0017] Identify the edge contours of each deformed region and determine the area of ​​the edge contours;

[0018] Determine the maximum depth of each deformation region;

[0019] Determining the area and maximum depth as depression morphological features;

[0020] The deformation area is the area where the stamping original part is concave or convex.

[0021] Furthermore, the process of determining the stress propagation sensitive area includes,

[0022] Enlarging the edge contour of the deformation area by a predetermined ratio to form the virtual propagation area;

[0023] determining an overlapping area of ​​each virtual propagation area, and determining the overlapping area as the stress propagation sensitive area;

[0024] The predetermined ratio is adjusted based on the concave morphological characteristics of the deformation area.

[0025] Furthermore, the process of calculating the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive area includes:

[0026] determining a plurality of virtual propagation regions corresponding to the stress propagation sensitive region, and determining a deformation region corresponding to each virtual propagation region;

[0027] Solve the concave morphological characteristics corresponding to each deformation area, and calculate the mean area and the mean maximum depth;

[0028] Calculating a first ratio of the area mean to a preset area threshold;

[0029] Calculating a second ratio of the maximum depth mean to a preset depth threshold;

[0030] The stress propagation interference coefficient is obtained by performing a weighted summation of the first ratio and the second ratio.

[0031] Furthermore, the process of determining the stress propagation interference category of the stamping process includes:

[0032] If the stress propagation interference coefficient is greater than or equal to a preset stress propagation interference threshold, it is determined to be a first stress propagation interference category;

[0033] If the stress propagation interference coefficient is less than a preset stress propagation interference threshold, it is determined to be a second stress propagation interference category.

[0034] Furthermore, the stamping original part is placed in the stamping die, and the stamping part is stamped based on the stress propagation interference category, including:

[0035] If the stress propagation interference category is determined to be the first, the stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the stamping process is acquired from a reference viewing angle. Stress propagation-sensitive areas are calibrated in the infrared image. The temperature profile bands adjacent to the stress propagation-sensitive areas are used to determine whether the stamping process is abnormal.

[0036] If it is determined to be the second stress propagation interference category, the stamping parameters are maintained to complete the stamping and prepare the bridge housing component.

[0037] Furthermore, adjusting the stamping speed and stamping pressure based on the stress propagation interference coefficient includes:

[0038] Reduce the punching speed. The reduction is positively correlated with the stress propagation interference coefficient.

[0039] Increasing the stamping pressure, the increase is positively correlated with the stress propagation interference coefficient.

[0040] Furthermore, it also includes determining the temperature contour zone adjacent to the stress propagation sensitive area, and the determination process includes:

[0041] The stress propagation sensitive area is divided into several contour bands along its edge, and the two ends of each contour band are connected to the edge contour of the nearest deformation area at the shortest distance to form a closed area, which is determined as the temperature contour band.

[0042] Furthermore, judging whether the stamping process is abnormal based on the stress propagation sensitive area and the adjacent temperature contour zone includes:

[0043] Determine the stress propagation sensitive area and the temperature change rate of each temperature contour zone during the stamping process, as well as the temperature dispersion;

[0044] If the abnormal conditions are met, it is determined that there is an abnormality in the stamping process;

[0045] The temperature dispersion is calculated based on the variance of the temperature of each local area in the stress propagation sensitive area and each temperature contour band. The abnormal condition is that the temperature change rate is not within the standard rate range and the temperature dispersion is greater than a predetermined temperature dispersion threshold.

[0046] Furthermore, the method also includes issuing a warning signal in response to determining that an abnormality exists in the stamping process.

[0047] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention obtains the target stamping model, identifies several deformation areas of the target stamping model, performs stress propagation analysis based on each of the deformation areas, constructs several virtual propagation areas based on the edge contours of each deformation area, determines the stress propagation sensitive area according to the superposition of the virtual propagation areas, calculates the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive area to determine the stress propagation interference category of the stamping process, stamps the stamping parts based on the stress propagation interference category, prepares the bridge shell components, and reduces the influence of stress propagation interference around the deformation area during the preparation of the bridge shell on the quality of the bridge shell by adaptively optimizing the process parameters, reduces the bridge shell with irreversible deformation and abnormal strength, and ensures the quality of the bridge shell.

[0048] In particular, the present invention identifies stress-sensitive areas based on the superposition of virtual propagation regions. In actual axle housings, deformation occurs during the stamping process due to the force applied by the punch, with deformation primarily concentrated at the edges. Consequently, significant stress is released near the edges of the deformation regions. Based on this, the present invention constructs virtual propagation regions, the size of which is determined by the concave morphology of the deformation regions. This allows for adaptive characterization of stress propagation around different deformation regions. Since an axle housing may contain multiple deformation regions, each generating stress, these stresses interfere with each other after discrete propagation, resulting in sensitive areas with significant interference. Therefore, the present invention identifies areas with relatively concentrated stress and significant interference by superposing virtual propagation regions. Due to the discrete and unpredictable nature of stress propagation, these areas may exhibit abnormal deformation or low strength during the stamping process. Therefore, identifying stress-sensitive areas facilitates subsequent determination of the stress propagation interference category during the stamping process, allowing for timely intervention in process parameters. This, in turn, reduces the impact of stress propagation interference around deformation regions during axle housing fabrication on axle housing quality, reduces irreversible deformation, and reduces the incidence of abnormal strength, thereby ensuring axle housing quality.

[0049] In particular, the present invention calculates the stress propagation interference coefficient based on several concave morphological features 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, the concave morphological features of the deformation area corresponding to the virtual propagation area are considered. In actual conditions, the larger the area and the deeper the depth, the greater the deformation amount. The stress propagation and concentration phenomenon at the edge of the deformation area are more intense. Based on this, the superposition effect of each deformation area on the stress propagation sensitive area is considered, and the stress propagation interference coefficient is calculated by the concave morphological features of each deformation area to characterize the stress concentration of the stress propagation sensitive area subjected to multi-party stress interference, and then the stress propagation interference category of the stamping process is determined. The process parameters are subsequently adaptively adjusted to reduce the impact of stress propagation interference around the deformation area during the preparation of the bridge shell on the quality of the bridge shell, reduce irreversible deformation and abnormal strength of the bridge shell, and ensure the quality of the bridge shell.

[0050] In particular, the stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient. For the first stress propagation interference category, there are areas where stress interference occurs in multiple directions and stress is concentrated and the stress interference is strong. Therefore, the stamping speed is adaptively reduced first to slow down the stress release. At the same time, the stamping pressure is appropriately increased to reduce the stress caused by rebound. The focus is on monitoring the stress propagation sensitive areas and the adjacent temperature contour bands. In actual situations, the stress in the stress propagation sensitive areas is concentrated, 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 contour band is constructed to reflect whether there is a temperature anomaly, characterize the situation of excessive stress concentration, and timely identify stamping anomalies, reduce the impact of stress propagation interference around the deformation area during the bridge shell preparation process on the bridge shell quality, reduce bridge shells with irreversible deformation and strength abnormalities, and ensure the quality of the bridge shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the steps of a method for preparing a high-strength automobile axle housing according to an embodiment of the present invention;

[0052] Figure 2 A logic block diagram for determining the stress propagation interference category of a stamping process according to an embodiment of the present invention;

[0053] Figure 3 A logic block diagram of stamping a stamped part based on stress propagation interference classification to prepare a bridge housing component according to an embodiment of the present invention;

[0054] Figure 4 This is a logic block diagram for determining whether a stamping process is abnormal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0056] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0057] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating 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 does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0058] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] See also Figure 1 As shown, Figure 1 Schematic diagram of the steps of a method for preparing a high-strength automobile axle housing according to an embodiment of the present invention. The method for preparing a high-strength automobile axle housing according to an embodiment of the present invention comprises:

[0060] Step S1, obtaining a target stamping model and identifying several deformation regions of the target stamping model;

[0061] Step S2, performing stress propagation analysis based on each of the deformed regions to extract concave morphological features and edge contours of each deformed region;

[0062] Step S3, constructing a number of virtual propagation areas based on the edge contours of each deformation area, and determining the stress propagation sensitive area according to the superposition of the virtual propagation areas;

[0063] Step S4, calculating the stress propagation interference coefficient based on a number of concave morphological features corresponding to the stress propagation sensitive area to determine the stress propagation interference type of the stamping process;

[0064] Step S5, placing the stamping original part on a stamping die, and stamping the stamping part based on the stress propagation interference category to prepare the bridge housing component, including:

[0065] The stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the reference angle during the stamping process is acquired. The stress propagation sensitive area is calibrated in the infrared image. The stress propagation sensitive area and the adjacent temperature contour band are used to determine whether the stamping process is abnormal.

[0066] Or, maintain the stamping parameters and complete the stamping;

[0067] The reference viewing angle is the viewing angle parallel to the punching direction.

[0068] Specifically, there is no limitation on the specific structure of the stamping die and the stamping equipment. Those skilled in the art in the stamping die can design it according to the structural requirements of the bridge shell. The stamping equipment only needs to provide stamping pressure to the stamping die to complete the stamping. These are all existing technologies and will not be elaborated here.

[0069] Specifically, the stamped original part of the bridge housing is usually a plate. In order to meet different needs, several deformation areas are formed on the plate by stamping. The deformation area is the area where there is a depression or a protrusion.

[0070] Specifically, the target stamping model is a pre-built three-dimensional model, that is, the three-dimensional model corresponding to the rear axle housing after forming. Through the three-dimensional model, the deformation area, the corresponding concave morphological features and edge contours can be determined, which will not be repeated here.

[0071] Specifically, there is no limitation on the method of obtaining infrared images. The purpose of obtaining infrared images is to consider the temperature field of the stamping die. Existing infrared image acquisition equipment with strong penetration can be used. It only needs to realize the corresponding function. This will not be elaborated.

[0072] Specifically, the process of stress propagation analysis for each deformation area includes:

[0073] Identify the edge contours of each deformed region and determine the area of ​​the edge contours;

[0074] Determine the maximum depth of each deformation region;

[0075] Determining the area and maximum depth as depression morphological features;

[0076] The deformation area is the area where the stamping original part is concave or convex.

[0077] Specifically, the process of determining the stress propagation sensitive areas includes:

[0078] Enlarging the edge contour of the deformation area by a predetermined ratio to form the virtual propagation area;

[0079] determining an overlapping area of ​​each virtual propagation area, and determining the overlapping area as the stress propagation sensitive area;

[0080] The predetermined ratio is adjusted based on the concave morphological characteristics of the deformation area.

[0081] The present invention identifies stress-sensitive areas based on the superposition of virtual propagation regions. In actual axle housings, deformation occurs during the stamping process due to the force applied by the punch, with deformation primarily concentrated at the edges. Consequently, significant stress is released near the edges of the deformation regions. Based on this, the present invention constructs virtual propagation regions, the size of which is determined by the concave morphology of the deformation regions. This allows for adaptive characterization of stress propagation around different deformation regions. Since an axle housing may contain multiple deformation regions, each generating stress, these stresses interfere with each other after discrete propagation, resulting in sensitive areas with significant interference. Therefore, the present invention identifies areas with relatively concentrated stress and significant interference by superposing virtual propagation regions. Due to the discrete and unpredictable nature of stress propagation, these areas may exhibit abnormal deformation or low strength during the stamping process. Therefore, identifying stress-sensitive areas facilitates subsequent determination of the stress propagation interference category during the stamping process, allowing for timely intervention in process parameters. This, in turn, reduces the impact of stress propagation interference around deformation regions during axle housing fabrication on axle housing quality, reduces irreversible deformation, and reduces strength abnormalities, thereby ensuring axle housing quality.

[0082] Specifically, in order to focus on the stress propagation in the vicinity of the deformation area, the initial predetermined ratio is set to 1.5 times.

[0083] In implementation, optionally,

[0084] Calculating the ratio of the area of ​​the concave morphological feature of the deformation region to a preset area threshold to obtain a first consideration factor;

[0085] Calculating the ratio of the maximum depth to a preset depth threshold to obtain a second consideration factor;

[0086] The first consideration factor and the second consideration factor are weighted and summed to obtain the concave morphological characteristic consideration factor;

[0087] In order to comprehensively consider the two factors, the weights are both 0.5 in the weighted sum.

[0088] If the concave morphological characteristic consideration factor is within the predetermined standard range, the predetermined ratio is set as the initial predetermined ratio;

[0089] If the concave morphological characteristic consideration factor is greater than the upper limit of the predetermined standard range, the predetermined ratio is set to 1.25 times the initial predetermined ratio;

[0090] If the concave 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.

[0091] 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.

[0092] Specifically, the process of calculating the stress propagation interference coefficient based on several concave morphological features corresponding to the stress propagation sensitive area includes:

[0093] determining a plurality of virtual propagation regions corresponding to the stress propagation sensitive region, and determining a deformation region corresponding to each virtual propagation region;

[0094] Solve the concave morphological characteristics corresponding to each deformation area, and calculate the mean area and the mean maximum depth;

[0095] Calculating a first ratio of the area mean to a preset area threshold;

[0096] Calculating a second ratio of the maximum depth mean to a preset depth threshold;

[0097] The stress propagation interference coefficient is obtained by performing a weighted summation of the first ratio and the second ratio.

[0098] Specifically, the preset area threshold and the preset depth threshold are predetermined. Several open source target stamping models are obtained in advance as samples, the concave morphological features are extracted, the area mean and the maximum depth mean are solved, the preset area threshold is set as the product of the area mean and the offset coefficient, and the depth threshold is set as the product of the maximum depth mean and the offset coefficient. The offset coefficient is selected within the interval [1.05, 1.15].

[0099] During weighted summation, the weights of the first ratio and the second ratio are both 0.5.

[0100] The present invention calculates the stress propagation interference coefficient based on several concave morphological features 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, the concave morphological features of the deformation area corresponding to the virtual propagation area are considered. In actual conditions, the larger the area and the deeper the depth, the greater the deformation amount. The stress propagation and concentration phenomena at the edge of the deformation area are more intense. Based on this, the superposition effect of each deformation area on the stress propagation sensitive area is considered. The stress propagation interference coefficient is calculated by the concave morphological features of each deformation area to characterize the stress concentration of the stress propagation sensitive area subjected to multi-party stress interference, and then the stress propagation interference category of the stamping process is determined. The process parameters are subsequently adaptively adjusted to reduce the influence of stress propagation interference around the deformation area during the preparation of the bridge shell on the quality of the bridge shell, reduce irreversible deformation and abnormal strength of the bridge shell, and ensure the quality of the bridge shell.

[0101] Specifically, see Figure 2 As shown, Figure 2 This is a logic block diagram for determining the stress propagation interference category of a stamping process according to an embodiment of the present invention. The process of determining the stress propagation interference category of a stamping process includes:

[0102] If the stress propagation interference coefficient is greater than or equal to a preset stress propagation interference threshold, it is determined to be a first stress propagation interference category;

[0103] If the stress propagation interference coefficient is less than a preset stress propagation interference threshold, it is determined to be a second stress propagation interference category.

[0104] The stress propagation interference threshold is a stress propagation interference coefficient calculated when the area mean is equal to a preset area threshold and the maximum depth mean is equal to a preset depth threshold.

[0105] Specifically, see Figure 3 As shown, Figure 3 This is a logic diagram of stamping parts based on stress propagation interference categories to prepare bridge housing components in an embodiment of the present invention.

[0106] Specifically, the stamping original part is placed in the stamping die, and the stamping process is performed on the stamping part based on the stress propagation interference category, including:

[0107] If the stress propagation interference category is determined to be the first, the stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the stamping process is acquired from a reference viewing angle. Stress propagation-sensitive areas are calibrated in the infrared image. The temperature profile bands adjacent to the stress propagation-sensitive areas are used to determine whether the stamping process is abnormal.

[0108] If it is determined to be the second stress propagation interference category, the stamping parameters are maintained to complete the stamping and prepare the bridge housing component.

[0109] Specifically, adjusting the stamping speed and stamping pressure based on the stress propagation interference coefficient includes:

[0110] Reduce the punching speed. The reduction is positively correlated with the stress propagation interference coefficient.

[0111] Increasing the stamping pressure, the increase is positively correlated with the stress propagation interference coefficient.

[0112] In implementation, optionally,

[0113] Setting a first stress propagation interference coefficient comparison parameter and a second stress propagation interference coefficient comparison parameter;

[0114] 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, the stamping speed is reduced by 0.15 times the initial stamping speed; the stamping pressure is increased by 0.1 times the initial stamping pressure;

[0115] 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, the stamping speed decrease is 0.3 times the initial stamping speed, and the stamping pressure increase is 0.2 times the initial stamping pressure;

[0116] If the stress propagation interference coefficient is greater than or equal to the second stress propagation interference coefficient comparison parameter, the reduction in punching speed is 0.45 times the initial punching speed, and the increase in punching pressure is 0.3 times the initial punching pressure.

[0117] 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.

[0118] Specifically, it also includes determining the temperature contour zone adjacent to the stress propagation sensitive area, and the determination process includes:

[0119] The stress propagation sensitive area is divided into several contour bands along its edge, and the two ends of each contour band are connected to the edge contour of the nearest deformation area at the shortest distance to form a closed area, which is determined as the temperature contour band.

[0120] Specifically, the contour band is the edge of the stress propagation sensitive area. Since this area is affected by the stress release of multiple deformation areas, the stress propagation path is focused on by connecting the two ends of the contour band with the edge contour of the nearest deformation area with the shortest connection, and then focusing on monitoring the temperature changes on the corresponding path.

[0121] Specifically, see Figure 4 As shown, Figure 4 This is a logic block diagram for determining whether a stamping process is abnormal according to an embodiment of the present invention. Determining whether a stamping process is abnormal based on a stress propagation sensitive area and an adjacent temperature profile zone includes:

[0122] Determine the stress propagation sensitive area and the temperature change rate of each temperature contour zone during the stamping process, as well as the temperature dispersion;

[0123] If the abnormal conditions are met, it is determined that there is an abnormality in the stamping process;

[0124] The temperature dispersion is calculated based on the variance of the temperature of each local area in the stress propagation sensitive area and each temperature contour band. The abnormal condition is that the temperature change rate is not within the standard rate range and the temperature dispersion is greater than a predetermined temperature dispersion threshold.

[0125] Specifically, in implementation, the temperature dispersion is the variance of the temperature of each local area in each adjacent deformation area. The standard rate interval and the temperature dispersion threshold are both predetermined. The temperature change rate and temperature dispersion of the finished bridge shell that have passed the inspection are recorded in advance, and the mean value of the temperature change rate and the mean value of the temperature dispersion are solved. The temperature dispersion threshold is set to the product of the mean value of the temperature dispersion and the error coefficient. The upper limit of the standard rate interval is set to 1.25 times the mean value of the temperature change rate, and the lower limit of the standard rate interval is set to 0.75 times the mean value of the temperature change rate. The standard rate interval is an open interval, and the error coefficient is selected within the interval [1.15, 1.3].

[0126] The stamping speed and stamping pressure are adjusted based on the stress propagation interference coefficient. For the first stress propagation interference category, there are areas where stress interference occurs in multiple directions and stress is concentrated and the stress interference is strong. Therefore, the stamping speed is adaptively reduced first to slow down the 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 areas and the adjacent temperature contour bands. In actual situations, the stress propagation sensitive areas are concentrated, 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 contour band is constructed to reflect whether there is a temperature anomaly, characterize the situation where stress is too concentrated, and timely identify stamping anomalies, reduce the impact of stress propagation interference around the deformation area during the bridge shell preparation process on the bridge shell quality, reduce bridge shells with irreversible deformation and strength abnormalities, and ensure the quality of the bridge shell.

[0127] Thus far, the technical solutions of the present invention have been described in conjunction with 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 may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A method for preparing a high-strength automobile axle housing, characterized in that: include: Acquire a target stamping model and identify several deformation regions of the target stamping model; Performing stress propagation analysis based on each of the deformed regions to extract concave morphological features and edge contours of each deformed region; Based on the edge contours of each deformation area, several virtual propagation areas are constructed, and the stress propagation sensitive area is determined by superposition of the virtual propagation areas; 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 type of the stamping process; The stamping original part is placed in the stamping die, and the stamping part is stamped based on the stress propagation interference category to prepare the bridge shell component, including: The stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the reference angle during the stamping process is acquired. The stress propagation sensitive area is calibrated in the infrared image. The stress propagation sensitive area and the adjacent temperature contour band are used to determine whether the stamping process is abnormal. Or, maintain the stamping parameters and complete the stamping; The reference viewing angle is the viewing angle parallel to the punching direction.

2. The method for preparing a high-strength automobile axle housing according to claim 1, characterized in that: The process of stress propagation analysis for each deformation area 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; Determining the area and maximum depth as depression morphological features; The deformation area is the area where the stamping original part is concave or convex.

3. The method for preparing a high-strength automobile axle housing according to claim 1, characterized in that: The process of identifying areas susceptible to stress propagation includes, Enlarging the edge contour of the deformation area by a predetermined ratio to form the virtual propagation area; determining an overlapping area of ​​each virtual propagation area, and determining the overlapping area as the stress propagation sensitive area; The predetermined ratio is adjusted based on the concave morphological characteristics of the deformation area.

4. The method for preparing a high-strength automobile 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 area includes: determining a plurality of virtual propagation regions corresponding to the stress propagation sensitive region, and determining a deformation region corresponding to each virtual propagation region; Solve the concave morphological characteristics corresponding to each deformation area, and calculate the mean area and the mean maximum depth; Calculating a first ratio of the area mean to a preset area threshold; Calculating a second ratio of the maximum depth mean to a preset depth threshold; The stress propagation interference coefficient is obtained by performing a weighted summation of the first ratio and the second ratio.

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

6. The method for preparing a high-strength automobile axle housing according to claim 5, characterized in that: Place the stamping original part on the stamping die, and stamp the stamping part based on the stress propagation interference category, including: If the stress propagation interference category is determined to be the first, the stamping speed and pressure are adjusted based on the stress propagation interference coefficient. An infrared image of the stamping process is acquired from a reference viewing angle. Stress propagation-sensitive areas are calibrated in the infrared image. The temperature profile bands adjacent to the stress propagation-sensitive areas are used to determine whether the stamping process is abnormal. If it is determined to be the second stress propagation interference category, the stamping parameters are maintained to complete the stamping and prepare the bridge housing component.

7. The method for preparing a high-strength automobile axle housing according to claim 1, characterized in that: Adjusting the punching speed and punching pressure based on the stress propagation interference coefficient includes: Reduce the punching speed. The reduction is positively correlated with the stress propagation interference coefficient. Increasing the stamping pressure, the increase is positively correlated with the stress propagation interference coefficient.

8. The method for preparing a high-strength automobile axle housing according to claim 1, characterized in that: It also includes determining the temperature contour zone adjacent to the stress propagation sensitive area, and the determination process includes: The stress propagation sensitive area is divided into several contour bands along its edge, and the two ends of each contour band are connected to the edge contour of the nearest deformation area at the shortest distance to form a closed area, which is determined as the temperature contour band.

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

10. The method for preparing a high-strength automobile axle housing according to claim 1, characterized in that: The method further includes issuing a warning signal in response to determining that an abnormality exists in the stamping process.

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