Using patent analysis methods, this paper analyzes the patent layout of automotive hot stamping dies from the perspectives of patent application trends, regional distribution, and applicants, and taking automotive B-pillar hot stamping dies and automotive longitudinal beam hot stamping dies as examples to interprets important patent technical solutions. From a patent perspective, this paper analyzes the development status of automotive hot stamping die technology from both macro and micro perspectives, and provides reference for subsequent research, development and innovation directions in the field of automotive hot stamping die technology.

In order to solve the problem of the leakage of the flat tube of the all-aluminum low-temperature water tank in the thermal shock test, this article proposes 3 design adjustments, namely, widening the flat tube, changing the O-type collector tube and adding the spacer plate. Finite element analysis software Abaqus is used on the original design scheme and all-aluminum low-temperature water tank under 3 kinds of adjustment scheme for Finite Element Analysis (FEA) analysis, to get the maximum local stress of the flat tube at the leakage area and the maximum plastic strain and its distribution. Thermal shock bench tests are conducted using thermal shock life and the number and location of flat tube leaks as indicators. The results show that the thermal shock life is inversely proportional to the maximum local stress and plastic strain. The location of the leaking flat pipe of the test piece is consistent with the local stress and plastic strain distribution pattern, and the FEA simulation analysis is in good agreement with the test verification. Therefore, in order to extend the thermal shock life of the all-aluminum low temperature water tank, the program sequence is optimized as follows: use of O-type collector tubes, use of narrow flat tubes and use of double bulkheads.

At present, the automotive industry mainly through the process monitoring based on coating specifications, as well as the result monitoring based on the final bonding effect to effectively ensure the quality of the coating. In order to improve coating quality detection efficiency, this paper, by learning from to the ultrasonic welding spot nondestructive testing technology, explores the application of ultrasonic phased array technology in the detection of body glue, and proves its feasibility theoretically, Moreover, this paper also uses ultrasonic phased array nondestructive testing instrument for practical application inspection, and finally realizes the nondestructive testing of body glue.

In order to evaluate the feasibility of the application of thin Al-Si coated hot formed steel in automobile body, hot stamping test, spot welding test, adhesive matching test and coating test and corrosion resistance test are carried out on single-sided Al-Si coated materials with the weight of 20 g/m² (AS20) and 75 g/m² (AS75). The results show that: AS20 material can use the same heating temperature as the AS75 material, but the heating time is less than the AS75 material; under the optimal heating process, the mechanical properties of the two materials are comparable; the ultimate sharp cold bending angle and maximum force of the AS20 material are higher than those of the AS75 material; the shear strengths of the adhesive joints between the two materials and the structural adhesive currently used in production are comparable, the AS20 material matches well with the structural adhesive currently used in production; the peeling diameter of the fully damaged welding point and the fusion diameter and failure mode of the welding assembly where the two materials are located are equivalent, the spot weldability of the AS20 material is equivalent to that of the AS75 material; the adhesion and corrosion resistance of the electrophoretic paint film of the two materials are comparable. Overall, based on multi-performance comparative evaluation analysis, the main application properties of thin aluminum silicon coated hot formed steel meets the using requirements of OEMs.

Based on the characteristics of e-ink, flexible segment-code e-ink diaphragm is used to integrate with the trim strip of a vehicle, in order to explore the feasibility of integrating e-ink and interior parts, and the vehicle specification test is conducted. Environmental tests show that the e-ink diaphragm or module can withstand the high and low temperature range of -40~70 ℃, and the e-ink diaphragm will be damaged if the temperature exceeds 70 ℃. The alternating test in the temperature range of -30~85 ℃ is easy to cause the wrinkle or stratification of the multi-layer structure of the module. Therefore, the structure and material of e-ink cannot fully meet the automobile specification test, and further research is needed to identify the application potential of e-ink in automobile interior parts.

Gap interference exists between the left front combination lamp and the fender of a vehicle model. The design requirement is (1.2±1.0) mm. To ensure the exterior fit meets the design requirements, this paper analyzes the issue from a dimensional perspective. PolyWorks software is used to make dimensional measurements on the beam and side panel assembly, and the headlamp is virtually installed to simulate its posture for verification. This paper also concludes the impact of the parallelism deviation of the integrated bracket mounting surface on the BIW frame on the headlamp’s posture. Combining this with the actual welding process on site, the body fixtures are adjusted and the gap interference issue between the headlamp and the fender is solued ultimately.

In order to rationally plan workshop layout, this paper proposes an assembly workshop layout planning method based on genetic algorithm. A mathematical model of workshop layout planning is constructed by linear programming, and the model is solved by genetic algorithm, then assembly workshop of an enterprise is taken as example to verify effectiveness of the model. The research findings indicate that the proposed method can effectively address the workshop layout problem resulting from logistics upgrading, which presents a general solution for the workshop layout planning in discrete manufacturing enterprises under similar circumstances.

In response to the occurrence of defects such as shrinkage and porosity during the casting process, which lead to stress concentration under high load conditions, produce local high stress-strain zones and local yielding, resulting in reducing the service life of the parts. By using a combination of finite element simplified modeling and experimental analysis verification, the effects of the distance between micropores and the free surface, the distance between the pores, the porosity morphology and the distribution angles on the stress concentration in A356 cast aluminum alloys are systematically studied. The relationship between the influence of each defect feature on the stress-strain concentration is established, and the established relationship is verified by actual pores in the sample.

To solve the quality issues that rear quarter PVC residue interference with assembly shop installation, PVC material, nozzle temperature and robot application program are optimized as following. For PVC material, Relevant viscosity and yield value with the precondition of no influence to the tightness and appearance are increased; The nozzle temperature is reduced and the PVC residue amount is decreased; The gun on-and-off points of rear quarter are cancelled and two adjacent seams are combined to one big seam. The result indicates that the solutions above remove the PVC residue on rear quarter and avoid the PVC interference to assembly installation surface.

Based on the existing wet spray booth scrubber system in the domestic automotive manufacturing industry, this study analyzes the wet eliminator to dry carton system proposal, modifies the exit structure and develops the targeted solutions according to different building height,spray booth width, layout and surroundings. At the same time, simulation software is used to simulate and optimize the field flow, in order to shorten modification cycle, reduce the investment cost and optimize the equipment.