CN107590318B - Simulation analysis method for hot riveting process of automobile thrust rod - Google Patents
Simulation analysis method for hot riveting process of automobile thrust rod Download PDFInfo
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Abstract
The invention discloses a simulation analysis method for a hot riveting process of an automobile thrust rod, which realizes the simulation of the whole procedure of the hot riveting process of the thrust rod by means of a plastic mechanics theory and finite element simulation software of a forming process, can reproduce the hot riveting process, the change conditions of all internal characteristics (such as stress strain, metal flow line and the like) and external characteristics (such as sleeve deformation, contact between a ball head and the sleeve and the like) of the sleeve, the characteristics are data which can not be obtained by a trial-manufacture experimental research method, the formation mechanism of the defects in the hot riveting process can be intuitively analyzed through the characteristics, the method has the advantages that the optimization design of the process parameters is realized by the contrastive analysis under different process parameters, the risk of trial production tests is effectively reduced, the process parameter determination period of the thrust rod is greatly shortened, the production cost of the thrust rod is greatly reduced, and the method provides powerful support for the thrust rod product to be rapidly pushed to the market.
Description
Technical Field
The invention relates to a technology for analyzing and optimizing a hot riveting production process of an automobile thrust rod, in particular to a method for simulating and analyzing the hot riveting process of the automobile thrust rod.
Background
The automobile thrust rod is one of key parts of a balance suspension and an air suspension, and plays a vital role in automobile running safety. In the running process of the vehicle, the thrust rod plays a vital role in the aspects of force transmission, limiting, vibration isolation, impact mitigation and the like. The thrust rod in the current market is assembled by a ball head and a sleeve, wherein the ball head is an assembly part of the thrust rod, one end of the ball head is a ball handle, riveting corrugations are arranged at the end of the ball handle and are used for realizing connection with the sleeve through a hot riveting process, and the other end of the ball handle is annular and is used for installing a ball hinge; the sleeve is an assembly part of the thrust rod, and a certain length is generally intercepted by adopting a seamless steel pipe.
The assembly process for connecting the ball head of the thrust rod and the sleeve mainly comprises three processes of friction welding, hot riveting and threaded connection, wherein the hot riveting accounts for most of the processes. The hot riveting process comprises the following steps: heating one end or two ends of the sleeve to a process temperature, assembling the sleeve and the ball head together, placing the sleeve and the ball head on a specific mould, carrying out mould pressing through hydraulic equipment, pressing the sleeve and the ball head tightly, unloading the mould after maintaining pressure for a certain time, and hanging the assembly part for cooling. The process needs to ensure that the connection strength of the thrust rod on design needs to be met in terms of performance, namely, the sleeve and the ball head cannot have relative displacement under the action of certain pulling force or torque. The main parameters of the process comprise heating temperature, maximum pressure, riveting corrugation number and the like.
In the actual production process of the thrust rod, the problems of insufficient tensile strength and torsional strength of a product, cooling cracking and the like exist, and factors such as process parameters, a die structure and the like need to be adjusted, so that the process is improved, and the problems are solved. Therefore, the hot riveting technological process is researched, the optimal design of the hot riveting technological parameters is realized, and the quality control of the mass production of the thrust rod products is strongly supported. At present, the research of the hot riveting process of the thrust rod mainly focuses on the aspects of an experience formula, corrugation adjustment, structure improvement, mold improvement and the like, a large amount of products are trial-manufactured to perform product performance tests, and batch production can be performed after small batches of products are all qualified.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the simulation analysis method for the hot riveting process of the automobile thrust rod is provided, the forming mechanism of defects in the hot riveting process can be visually analyzed, the conditions of various internal characteristics (such as stress strain, metal flow lines and the like) and external characteristics (such as deformation of the sleeve, contact between a ball head and the sleeve and the like) of the sleeve are contrastively analyzed, the optimization design of process parameters is realized, the trial-manufacturing frequency of the process is effectively reduced, the trial-manufacturing period is shortened, the process cost is reduced, the trial-manufacturing efficiency of the product process is improved, the support is provided for the structural design and the mold design of the connecting area of the sleeve and the ball head of the thrust rod, and the support can be provided for the material selection of the thrust rod product.
In order to solve the technical problems, the invention adopts the technical scheme that:
a simulation analysis method for a hot riveting process of an automobile thrust rod is characterized by comprising the following implementation steps:
1) simplifying and decomposing an automobile thrust rod hot riveting process for hot riveting a sleeve and a ball head into an automobile thrust rod into three processes of sleeve heating, riveting forming and integral cooling in sequence, generating at least one group of process parameters based on a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof, and selecting one group of process parameters as current process parameters;
2) acquiring input data including a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof corresponding to current process parameters, and establishing an assembly geometric model of a sleeve, a fixed mold and a heating mold, wherein the fixed mold is used for fixing the sleeve in a sleeve heating procedure, and the heating mold is used for heating the sleeve in the sleeve heating procedure; establishing an assembly geometric model of a ball head, a die pressing die and a guide die, wherein the die pressing die is used for pressing the sleeve by using hydraulic equipment in the riveting forming process, and the guide die is used for guiding the movement of the ball head in the riveting forming process;
3) a sleeve heating procedure is newly built in finite element simulation software, geometric models of the assembled sleeve, a fixed die and a heating die are respectively led into the finite element simulation software, a multi-section metal flow line is set in a sleeve heating area, grids are divided, material attributes and thermal attributes are given, a sleeve heating simulation model is built, and sleeve heating procedure simulation is carried out;
4) reading a sleeve temperature distribution simulation result simulated in the sleeve heating procedure, judging whether the sleeve temperature distribution simulation result is consistent with the sleeve heating process temperature, if so, exporting the sleeve temperature distribution simulation result, and skipping to execute the step 5); otherwise, correcting the material attribute and the thermal attribute aiming at the sleeve heating simulation model, simulating the sleeve heating procedure again, and skipping to execute the step 4);
5) establishing a riveting forming procedure in finite element simulation software, respectively introducing geometric models of an assembled ball head, a die pressing die and a guide die into the finite element simulation software, setting the ball head as a deformable die and introducing a sleeve geometric model of a sleeve heating procedure as a workpiece, adjusting the distance between an upper die and a lower die of the die pressing die to enable the upper die and the lower die of the die pressing die to be just in contact with a sleeve, setting the descending speed of hydraulic equipment to be connected with the upper die of the die pressing die, setting the hydraulic equipment to stop when the maximum process pressure is reached, dividing the ball head into grids, defining material attributes of the sleeve and the ball head by using the grids in the previous sleeve heating procedure simulation, establishing a riveting forming simulation model and performing riveting forming procedure simulation;
6) in the process of simulating the riveting forming process, analyzing the change conditions of various internal characteristics and external characteristics of the sleeve along with the increase of pressure in the process of simulating the grain diameter and the rib width of the sleeve in the riveting forming process, wherein the internal characteristics comprise at least one of stress strain and metal flow line, and the external characteristics comprise at least one of sleeve deformation and contact between a ball head and the sleeve; meanwhile, reading the diameter of the corrugation formed by the sleeve and the width of the rib in the process of simulating the riveting forming process, if the diameter of the corrugation formed by the sleeve and the width of the rib are consistent with a preset empirical value, deriving a simulation result of the riveting forming process, and skipping to execute the step 7); otherwise, correcting the material properties of the sleeve and the ball head, simulating the riveting forming process again, and skipping to execute the step 6);
7) newly building an integral cooling process in finite element simulation software, deriving a geometric model of a sleeve and a ball head in a riveting forming process, introducing the geometric model of a fixed mold, setting the non-riveting end of the fixed mold and the sleeve as Glud, adopting the existing grids for the ball head and the sleeve, defining material attributes for the sleeve and the ball head, building an integral cooling process simulation model, simulating the integral cooling process, and reading a cooling change distribution result of the temperature obtained by simulation;
8) judging whether the time length of cooling to the normal temperature is consistent with a preset actual experience value, if not, modifying the attributes of the sleeve and the ball head in the simulation model of the overall cooling process, simulating the overall cooling process again, reading a cooling change distribution result of the temperature obtained by simulation, and skipping to execute the step 8); otherwise, the step of executing the jump is ended and the step 9 of executing the jump is executed);
9) judging whether the process parameters are traversed or not, if not, traversing and selecting the next group of process parameters as the current process parameters, and skipping to execute the step 2); otherwise, selecting the technological parameter with the optimal simulation result from all the technological parameters as the simulation analysis result of the automobile thrust rod hot riveting process and outputting the simulation analysis result.
Preferably, when the assembling geometric model of the sleeve, the fixed mold and the heating mold is established in the step 2), the corrugated structures at the ball handle connected with the ball head and the sleeve are all provided with corrugated structures, and the corrugated structures at the ball handle connected with the sleeve on the ball head correspond to the die pressing mold;
preferably, when the assembling geometric model of the sleeve, the fixed mold and the heating mold is established in the step 2), the heating mold is in a circular tube shape, the inner diameter of the heating mold is larger than the outer diameter of the sleeve, and the length of the heating mold is consistent with the actual heating length in the process file.
Preferably, when the assembly geometric model of the ball head, the molding die and the guide die is established in the step 2), the guide die is cylindrical or tubular.
Preferably, when the sleeve heating simulation model is established in the step 3), the assembling relationship between one end of the sleeve and the fixed mold is set to be "Glud", the other end of the sleeve is flush with the heating mold, a short-distance heat radiation mode is set for heating, grids are divided for the sleeve heating simulation model, and the grid type is "Overlay Hex".
Preferably, the detailed step of setting the multi-section metal streamline in the sleeve heating area in the step 3) comprises the following steps: the flow lines of Near-surface lines are arranged in a multi-section mode in the sleeve heating long area, and the distance between the flow lines is 1 mm.
Preferably, when the ball head is set as a deformable mold and the bushing geometric model of the bushing heating process is introduced as a workpiece in the step 5), the ball head is introduced as the mold and set as a deformable body, and when the ball head is divided into grids, the minimum size of the grid unit and the internal coarsening degree of the ball head are consistent with those of the bushing.
The simulation analysis method for the hot riveting process of the automobile thrust rod realizes the simulation reproduction of the whole process of the hot riveting process of the thrust rod, can reproduce the change conditions of various internal characteristics (such as stress strain, metal streamline and the like) and external characteristics (such as deformation of the sleeve, contact between a ball head and the sleeve and the like) of the sleeve in the hot riveting process, and has the following advantages:
1. the simulation analysis method for the hot riveting process of the automobile thrust rod realizes the simulation reproduction of the whole process of the hot riveting process of the thrust rod. The change conditions of various internal characteristics (such as stress strain, metal flow line and the like) and external characteristics (such as sleeve deformation, contact between a ball head and the sleeve and the like) of the sleeve in the hot riveting process are reproduced, and the formation mechanism of defects in the hot riveting process can be intuitively analyzed through the characteristics.
2. Based on the model of the simulation analysis method for the automobile thrust rod hot riveting process, different process parameter schemes are adjusted, and comparison analysis is performed on the conditions of various internal characteristics (such as stress strain, metal flow line and the like) and external characteristics (such as sleeve deformation, contact between a ball head and a sleeve and the like) of the sleeve, so that the optimization design of process parameters is realized.
3. The simulation analysis method for the hot riveting process of the automobile thrust rod can effectively reduce the trial-manufacturing times of the process, shorten the trial-manufacturing period, reduce the process cost and improve the trial-manufacturing efficiency of the process of the product.
4. The simulation analysis method for the hot riveting process of the automobile thrust rod can provide support for the structural design and the die design of the connecting area of the sleeve and the ball head of the thrust rod.
5. The simulation analysis method for the hot riveting process of the automobile thrust rod can provide support for material selection of a thrust rod product.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the implementation steps of the simulation analysis method for the automobile thrust rod hot riveting process in the embodiment include:
1) the automobile thrust rod hot riveting process for hot riveting the sleeve and the ball head into the automobile thrust rod is simplified and decomposed into three processes of sleeve heating, riveting forming and integral cooling in sequence, at least one group of process parameters are generated based on a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof, and one group of process parameters is selected as current process parameters.
2) Acquiring input data including a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof corresponding to current process parameters, and establishing an assembly geometric model of a sleeve, a fixed mold and a heating mold, wherein the fixed mold is used for fixing the sleeve in a sleeve heating procedure, and the heating mold is used for heating the sleeve in the sleeve heating procedure; and establishing an assembly geometric model of the ball head, a die pressing die and a guide die, wherein the die pressing die is used for pressing the sleeve by using hydraulic equipment in the riveting forming process, and the guide die is used for guiding the movement of the ball head in the riveting forming process.
In the embodiment, when the assembling geometric model of the sleeve, the fixed mold and the heating mold is established in the step 2), the corrugated structures at the ball handle connected with the ball head and the sleeve are all provided with corrugated structures, and the corrugated structure at the ball handle connected with the sleeve on the ball head corresponds to the mold pressing mold;
in this embodiment, when the assembly geometric model of the sleeve, the fixed mold and the heating mold is established in step 2), the heating mold is in a circular tube shape, the inner diameter of the heating mold is larger than the outer diameter of the sleeve, and the length of the heating mold is consistent with the actual heating length in the process file.
In this embodiment, when the assembly geometric model of the ball head, the molding die and the guide die is established in step 2), the guide die is cylindrical or tubular.
3) A sleeve Heating process (named as a Heating process in the embodiment) is newly built in finite element simulation software, geometric models of the assembled sleeve, a fixed mold and a Heating mold are respectively led into the finite element simulation software, a multi-section metal streamline is set in a sleeve Heating area, meshes are divided, material attributes and thermal attributes are given, a sleeve Heating simulation model is built, and sleeve Heating process simulation is carried out.
In this embodiment, the finite element simulation software specifically adopts simulact forming process simulation analysis software.
In this embodiment, when the sleeve heating simulation model is established in step 3), the assembly relationship between one end of the sleeve and the fixed mold is set to be "Glud", the other end of the sleeve is flush with the heating mold, heating is performed in a short-distance thermal radiation manner, grids are divided for the sleeve heating simulation model, and the grid type is "Overlay Hex".
In this embodiment, the detailed step of setting a multi-section metal flow line in the sleeve heating area in step 3) includes: the flow lines of Near-surface lines are arranged in a multi-section mode in a sleeve heating long area, and the distance between the flow lines is 1mm, so that the change condition of the metal flow lines of the sleeve section can be conveniently and clearly observed.
4) Reading a sleeve temperature distribution simulation result simulated in the sleeve heating procedure, judging whether the sleeve temperature distribution simulation result is consistent with the sleeve heating process temperature, if so, exporting the sleeve temperature distribution simulation result, and skipping to execute the step 5); otherwise, correcting the material attribute and the thermal attribute aiming at the sleeve heating simulation model, simulating the sleeve heating procedure again, and skipping to execute the step 4).
5) The method comprises the steps of newly establishing a riveting forming process (named as a forming process in the embodiment) in finite element simulation software, respectively introducing geometric models of an assembled ball head, a die pressing die and a guide die into the finite element simulation software, setting the ball head as a deformable die, introducing a sleeve geometric model of a sleeve heating process as a workpiece, adjusting the distance between an upper die and a lower die of the die pressing die to enable the upper die and the lower die of the die pressing die to be just in contact with a sleeve, setting the descending speed of hydraulic equipment to be connected with the upper die of the die pressing die, setting the hydraulic equipment to stop when the maximum process pressure is reached, dividing the ball head into grids, adopting the grids in the simulation of the sleeve heating process in the previous step for the sleeve, defining material properties of the sleeve and the ball head, establishing a riveting forming simulation model and. In the analysis and forming process of the riveting and forming process simulation, the change conditions of various internal characteristics (such as stress strain, metal flow line and the like) and external characteristics (such as sleeve deformation, contact between a ball head and a sleeve and the like) of the sleeve along with the increase of pressure can be analyzed, and the defect forming mechanism in the hot riveting process can be intuitively analyzed.
In this embodiment, when the ball head is set as the deformable mold in step 5) and the bushing geometric model of the bushing heating process is introduced as the workpiece, the ball head is introduced as the mold and set as the deformable body (deformable mold), and when the ball head is divided into grids, the minimum size of the grid unit of the ball head and the internal coarsening degree of the ball head are consistent with those of the bushing. The forming process software mainly aims at a forming process (a process for processing a metal material by utilizing the plastic property of the metal material to enable the metal material to have a required shape), the material hardness of a die in the forming process is at least one order of magnitude stronger than that of a machined part, and in general forming process analysis, only one machined part is generally considered without considering die deformation. In the process of the hot riveting process, the hardness difference between the ball head and the sleeve is not large, so that the ball head is taken as a deformable die as a second workpiece in the embodiment, and the unit size is consistent with the inner coarsening level, so that the simulation precision can be improved.
6) In the process of simulating the riveting forming process, analyzing the change conditions of various internal characteristics and external characteristics of the sleeve along with the increase of pressure in the process of simulating the grain diameter and the rib width of the sleeve in the riveting forming process, wherein the internal characteristics comprise at least one of stress strain and metal flow line, and the external characteristics comprise at least one of sleeve deformation and contact between a ball head and the sleeve; meanwhile, reading the diameter of the corrugation formed by the sleeve and the width of the rib in the process of simulating the riveting forming process, if the diameter of the corrugation formed by the sleeve and the width of the rib are consistent with a preset empirical value, deriving a simulation result of the riveting forming process, and skipping to execute the step 7); otherwise, correcting the material properties of the sleeve and the ball head, simulating the riveting forming process again, and skipping to execute the step 6).
7) An integral Cooling process (named as a Cooling process in the embodiment) is newly established in finite element simulation software, a geometric model of a sleeve and a ball head in a riveting forming process is led out, the geometric model of a fixed mold is led in, the non-riveting end of the fixed mold and the sleeve is set to be Glud, the ball head and the sleeve both adopt the existing grids, material properties are defined for the sleeve and the ball head, an integral Cooling process simulation model is established, the integral Cooling process simulation is carried out, and the Cooling change distribution result of the temperature obtained through simulation is read.
8) Judging whether the time length of cooling to the normal temperature is consistent with a preset actual experience value, if not, modifying the attributes of the sleeve and the ball head in the simulation model of the overall cooling process, simulating the overall cooling process again, reading a cooling change distribution result of the temperature obtained by simulation, and skipping to execute the step 8); otherwise the jump execution step ends and the jump execution step 9).
9) Judging whether the process parameters are traversed or not, if not, traversing and selecting the next process file as the current process file, and skipping to execute the step 2); otherwise, selecting the technological parameter with the optimal simulation result from all the technological parameters as the simulation analysis result of the automobile thrust rod hot riveting process and outputting the simulation analysis result.
In summary, the simulation analysis method for the automobile thrust rod hot riveting process of the embodiment realizes the simulation of the whole process of the thrust rod hot riveting process by means of the plastic mechanics theory and the forming process finite element simulation software. The method reproduces the change conditions of various internal characteristics (such as stress strain, metal flow line and the like) and external characteristics (such as sleeve deformation, contact between a ball head and a sleeve and the like) of the sleeve in the hot riveting process, the characteristics are data which cannot be obtained through a trial test research method, the formation mechanism of defects in the hot riveting process can be visually analyzed through the characteristics, the comparison analysis under different process parameters is realized, the optimization design of the process parameters is realized, the risk of the trial test is effectively reduced, the process parameter determination period of the thrust rod is greatly shortened, the production cost of the thrust rod is greatly reduced, and the method provides powerful support for the thrust rod product to be rapidly pushed to the market.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A simulation analysis method for a hot riveting process of an automobile thrust rod is characterized by comprising the following implementation steps:
1) simplifying and decomposing an automobile thrust rod hot riveting process for hot riveting a sleeve and a ball head into an automobile thrust rod into three processes of sleeve heating, riveting forming and integral cooling in sequence, generating at least one group of process parameters based on a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof, and selecting one group of process parameters as current process parameters;
2) acquiring input data including a process file, a thrust rod three-dimensional model, a mold model and a material mark thereof corresponding to current process parameters, and establishing an assembly geometric model of a sleeve, a fixed mold and a heating mold, wherein the fixed mold is used for fixing the sleeve in a sleeve heating procedure, and the heating mold is used for heating the sleeve in the sleeve heating procedure; establishing an assembly geometric model of a ball head, a die pressing die and a guide die, wherein the die pressing die is used for pressing the sleeve by using hydraulic equipment in the riveting forming process, and the guide die is used for guiding the movement of the ball head in the riveting forming process;
3) a sleeve heating procedure is newly built in finite element simulation software, geometric models of the assembled sleeve, a fixed die and a heating die are respectively led into the finite element simulation software, a multi-section metal flow line is set in a sleeve heating area, grids are divided, material attributes and thermal attributes are given, a sleeve heating simulation model is built, and sleeve heating procedure simulation is carried out;
4) reading a sleeve temperature distribution simulation result simulated in the sleeve heating procedure, judging whether the sleeve temperature distribution simulation result is consistent with the sleeve heating process temperature, if so, exporting the sleeve temperature distribution simulation result, and skipping to execute the step 5); otherwise, correcting the material attribute and the thermal attribute aiming at the sleeve heating simulation model, simulating the sleeve heating procedure again, and skipping to execute the step 4);
5) establishing a riveting forming procedure in finite element simulation software, respectively introducing geometric models of an assembled ball head, a die pressing die and a guide die into the finite element simulation software, setting the ball head as a deformable die and introducing a sleeve geometric model of a sleeve heating procedure as a workpiece, adjusting the distance between an upper die and a lower die of the die pressing die to enable the upper die and the lower die of the die pressing die to be just in contact with a sleeve, setting the descending speed of hydraulic equipment to be connected with the upper die of the die pressing die, setting the hydraulic equipment to stop when the maximum process pressure is reached, dividing the ball head into grids, defining material attributes of the sleeve and the ball head by using the grids in the previous sleeve heating procedure simulation, establishing a riveting forming simulation model and performing riveting forming procedure simulation;
6) in the process of simulating the riveting forming process, analyzing the change conditions of various internal characteristics and external characteristics of the sleeve along with the increase of pressure in the process of simulating the grain diameter and the rib width of the sleeve in the riveting forming process, wherein the internal characteristics comprise at least one of stress strain and metal flow line, and the external characteristics comprise at least one of sleeve deformation and contact between a ball head and the sleeve; meanwhile, reading the diameter of the corrugation formed by the sleeve and the width of the rib in the process of simulating the riveting forming process, if the diameter of the corrugation formed by the sleeve and the width of the rib are consistent with a preset empirical value, deriving a simulation result of the riveting forming process, and skipping to execute the step 7); otherwise, correcting the material properties of the sleeve and the ball head, simulating the riveting forming process again, and skipping to execute the step 6);
7) newly building an integral cooling process in finite element simulation software, deriving a geometric model of a sleeve and a ball head in a riveting forming process, introducing the geometric model of a fixed mold, setting the non-riveting end of the fixed mold and the sleeve as Glud, adopting the existing grids for the ball head and the sleeve, defining material attributes for the sleeve and the ball head, building an integral cooling process simulation model, simulating the integral cooling process, and reading a cooling change distribution result of the temperature obtained by simulation;
8) judging whether the time length of cooling to the normal temperature is consistent with a preset actual experience value, if not, modifying the attributes of the sleeve and the ball head in the simulation model of the overall cooling process, simulating the overall cooling process again, reading a cooling change distribution result of the temperature obtained by simulation, and skipping to execute the step 8); otherwise, the step of executing the jump is ended and the step 9 of executing the jump is executed);
9) judging whether the process parameters are traversed or not, if not, traversing and selecting the next group of process parameters as the current process parameters, and skipping to execute the step 2); otherwise, selecting the technological parameter with the optimal simulation result from all the technological parameters as the simulation analysis result of the automobile thrust rod hot riveting process and outputting the simulation analysis result.
2. The simulation analysis method for the hot riveting process of the automobile thrust rod according to claim 1, wherein when the geometric assembly model of the sleeve, the fixed mold and the heated mold is established in the step 2), the corrugated structures at the ball shank connected with the ball head and the sleeve are all provided with corrugated structures, and the corrugated structure at the ball shank connected with the sleeve on the ball head corresponds to the die pressing mold.
3. The simulation analysis method for the automobile thrust rod hot riveting process according to claim 1, wherein when the assembly geometric models of the sleeve, the fixed mold and the heating mold are established in the step 2), the heating mold is in a circular tube shape, the inner diameter of the heating mold is larger than the outer diameter of the sleeve, and the length of the heating mold is consistent with the actual heating length in the process file.
4. The simulation analysis method for the hot riveting process of the automobile thrust rod according to claim 1, wherein when the assembly geometric model of the ball head, the die pressing die and the guide die is established in the step 2), the guide die is cylindrical or tubular.
5. The simulation analysis method for the automobile thrust rod hot riveting process according to claim 1, wherein when the sleeve heating simulation model is established in step 3), the assembly relationship between one end of the sleeve and the fixed mold is set to be "Glud", the other end of the sleeve is flush with the heating mold, heating is performed in a short-distance heat radiation manner, grids are divided for the sleeve heating simulation model, and the grid type is "Overlay Hex".
6. The simulation analysis method for the automobile thrust rod hot riveting process according to claim 1, wherein the detailed step of setting a multi-section metal streamline in the sleeve heating area in step 3) comprises the following steps: the flow lines of Near-surface lines are arranged in a multi-section mode in the sleeve heating long area, and the distance between the flow lines is 1 mm.
7. The simulation analysis method for the hot riveting process of the automobile thrust rod according to claim 1, wherein in the step 5), when the ball head is set as a deformable mold and the sleeve geometric model of the sleeve heating process is introduced as a workpiece, the ball head is introduced as the mold and set as a deformable body, and when the ball head is divided into grids, the minimum size of the grid unit of the ball head and the internal coarsening degree of the ball head are consistent with those of the sleeve.
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| CN112906276B (en) * | 2021-03-02 | 2023-01-17 | 上海博汇模具有限公司 | Die profile temperature analysis method based on database |
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