高強鋼汽車傳動軸管輥彎成型過程管坯變形行為及輥形設計方法研究
[Abstract]:The drive shaft tube is an important part of the transmission system. The shaft tube of a large commercial vehicle is usually made of ordinary steel with a yield strength of 480MPa. In order to meet the mechanical performance requirements, the wall thickness of the drive shaft is larger and affects the light weight of the automobile. The mechanical properties of the shaft tube made of high strength steel instead of ordinary steel are good in mechanical properties, energy saving and emission reduction. The high strength steel transmission shaft tube is usually made of roll bending and high frequency welding, in which roll bending is the most basic and important molding process, and it has important influence on the quality of subsequent welding. Therefore, it has important theoretical significance and application value to study the bending forming technology of high strength steel automobile shaft tube roll. In the process of roll bending, the slab deformation is complicated, involving nonlinear material, geometric nonlinearity and contact nonlinearity. High strength steel has the characteristics of high material strength, large resilience, poor plasticity, and difficult welding. Its forming difficulty is larger than that of ordinary steel. There are many factors affecting roll shape of high strength steel, including roll shape design, process parameters and so on, among which roll shape The design is closely related to the deformation process of the tube billet, which has an important influence on the quality of the tube billet. Therefore, the design method of the roll shape and the deformation law of the tube blank in the bending of high strength steel are studied. The relationship between the roll shape and the forming quality in the molding of high strength steel is revealed, and the shape of the springback, the edge state of the tube billet, the quality of the tube billet and the subsequent welding are controlled. This paper mainly studies the roll shape design, the whole deformation behavior and the edge forming rule of the high strength steel shaft tube roll forming. The research object is that the shaft pipe of 120 x 4mm is used as the research object, and the material is 700QZ high strength steel. Based on the ABAQUS simulation software, the modeling method suitable for the bending forming of high strength steel shaft tube is studied. The finite element numerical simulation model of roll forming process is established by using reasonable roll simplification and forming process parameters. Through experiments, the section shape, opening and longitudinal depth of the slab are compared and verified. The axial tube of 134 x 4mm high strength steel is used as the study of the image, and the common double radius method is used in the roll bending forming. The roll shape design is carried out. The deformation law of the slab, the distribution characteristic of stress and strain, the excessive stress and strain in the forming and the interference of the slab are revealed. The first roll shape optimization design scheme is analyzed and proposed, and the design of the roll gap, the vertical roll and the closed roll are improved. The first optimization method can not solve the molding. In the second time optimization method, the W roll shape is designed and applied to the high strength steel shaft tube forming. The combined forming system of double W roll and double radius roller is established, which improves the deformation distribution and the stress concentration in the vertical roll group in the forming process. In this paper, a new method of three radius roll shape design is put forward in this paper. In this paper, a new method of three radius roll shape design is put forward. With the example of the shaft pipe of 134 x 4mm high strength steel, the roll shape is designed in detail. The size of stress and strain, the uniformity of the distribution and the thickness variation of the slab section are systematically analyzed. Law, the stress distribution of the vertical roll group is compared with the forming results of the common double radius method. The study shows that the three radius forming method has obvious advantages in realizing the uniform deformation of the high strength steel plate and improving the stress concentration of the vertical roll group. The application of single pass W and double pass W in the three half diameter forming method are studied, and the double W combination roll is systematically analyzed. The influence of the stress and strain distribution and the stress state of the vertical roll group provides a new idea for the design of the roll shape of the high strength steel transmission shaft. According to the stress concentration problem of the vertical roll group, the deformation of the common double radius, the double W double radius and the three radius forming method in the vertical roll form is analyzed, and the deformation distribution of the slab and the stress concentration in the region are revealed. The relationship between the edge deformation and the edge deformation control in the roll forming process is studied. The influence of the edge deformation roll and the W forming roller on the stress state of the edge of the slab is analyzed and compared. The strain distribution in the outer wall of the solid slab in the double W composite roll is studied, and the relative variation of the inner and outer wall deformation of the slab is proposed. The relative deformation of the inner and outer walls under different forming rollers was compared, and the influence of different initial forming rollers on the parallel butt of the edge was summarized. The contact and force state of the single radius and double radius vertical rollers on the slab were analyzed. The setting of the double radius and three radius vertical rollers was put forward to avoid the stress concentration and the Springback Control. By analyzing the shortcomings of the edge control of the ordinary single radius closed roll, the design method of double radius closed roll shape design considering the length of the slab and realizing the edge control is put forward, which provides a reference for the edge control in the roll bending.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG30;U463.2
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