The CAD system of steel pipe cold drawing process based on computer simulation optimization Han Baoyun Jin Ming Wu Youcai Zhong Qianxia (Steel Research Institute) results are directly analyzed and processed into the CAD system, so that the CAD system can help each cold drawing enterprise to quickly and effectively Design optimized extraction procedures.
Cold drawing of steel pipes is one of the traditional pressure processing methods and has always played an important role in the field of steel pipe manufacturing. Years of production experience have formed several relatively stereotyped drawing methods and corresponding technologies. However, like many other pressure processing methods, due to the lack of theoretical basis and effective research methods, the complicated multi-pass steel pipe cold drawing process has been adopted. Experience-based trial-and-error process design and research methods have led to some common problems in cold-drawn steel pipe production. With the rapid development of the welded pipe industry, the traditional cold-drawn seamless steel pipe industry is facing increasing Competitive pressure. How to use advanced high-tech and modern research methods to change the empirical design method of steel pipe cold drawing process is not only a way to improve the efficiency of relevant enterprises, but also has become a problem that enterprises must solve in the market competition. The research work done by the steel pipe room of the Iron and Steel Research Institute in this regard was introduced. Based on the new ideas of computer simulation technology and computer aided design technology (CAD), based on a large number of computer simulation research, the general software of CAD system for cold drawing process of steel pipe with direct optimization function is developed. The software can be applied to various enterprises in the steel pipe cold drawing industry, optimize the existing process system, or optimize the design of the new process system, so that the enterprise can reduce the production cost by 1% to 5% according to the existing level. The main problem is the traditional production method. The steel pipe cold drawing process has the characteristics of simple equipment, high product quality and flexible production. However, at the same time, the cold drawing process of steel pipes also has obvious weaknesses, that is, the number of deformation passes is large, the process is complicated, and the production cost is high. How to arrange the drawing regulations reasonably has been one of the main problems.
The design basis of the traditional drawing procedure is the semi-analytical and semi-empirical method to verify the design and research method is the field test or.
The finite element simulation study of the cold drawing process of the steel tube of the overall research scheme can be seen from the above research scheme, the workload of the whole research and development is very huge, so it is necessary to make scientific arrangements for the specific research and development program.
First of all, although the cold drawing process rules of various steel pipes in the world have their own characteristics, there are mainly four commonly used drawing methods: the arc-shaped die is drawn out; the tapered die is drawn out; the curved die-casting core is drawn; The tapered mold core is drawn. These four methods of extraction are selected as the main research object. The most typical materials are selected from the research: 15 steel pipes are treated as elastoplastic bodies, considering work hardening and strain. The effect of the rate. The material data is taken from a special simulation database. According to the wall thickness of the steel pipe, the wall thickness is divided into 4-finite elements to calculate the total number of elements in each model between 1200 and 2000. The elements are very fine and the simulation accuracy is guaranteed.
Using large-scale nonlinear finite element simulation software MARC, its good front-back processor makes modeling and result processing convenient and effective. Its world-leading solver makes the analogy result very reliable. The simulation work is carried out on HP dual-CPU microcomputer workstation.
In order to arrange the simulation test plan, it is first necessary to analyze the main independent influence parameters of various extraction methods. When the material of the steel tube is determined to be No. 15 steel and 00Cr19Ni9, the material parameters can be disregarded first. The remaining ones are the analysis method of the similarity theory for the process parameters, mold parameters and deformation parameters. The various parameters are expressed by the dimensionless relative parameters. In this way, the research results can be extended to any steel pipe size specification. After selecting the independent parameters of the four extraction methods, the simulation test can be arranged according to the possible variation range of these parameters in the production. All the main influencing factors and the possible range of these factors in actual production, the research results are systematic, can be extended to the whole steel pipe cold drawing industry, each enterprise describes the four independent extraction parameters of the different extraction methods, the rest Unknown parameters (such as stress, strain drawing force, etc.) are in the process of determining the parameters that need to be studied and studied. After MARC post-processing, the distribution of these parameters in the deformation zone can be conveniently studied, and the specific values ​​can be read. The values ​​of these parameters to be studied and the corresponding influence parameter values, using the series These models are based on a wide range of simulation tests and are applicable to the entire cold drawing industry. Through the study of material properties, the results of No. 15 steel and 00Cr19Ni9 can be extended to other similar steel grades. In addition to the influence of the above factors, the pull-out elongation coefficient must also make the single-pass maximum plastic strain X* less than a certain limit (1) CAD combined with simulation technology, which can solve the value well. The X-model can predict the Xx value of each pass should be less than the optimization problem of a cold drawing process of a steel pipe. The value of this method for other processing processes will otherwise produce microscopic quality problems. The study of lourcEhttp:// Net CAD system and function (2) After a large number of computer simulation studies under a wide range of process conditions, the necessary related parameter models are obtained. Based on these models, CAD software for the cold drawing CAD system of the steel tube is developed. More optimized function (continued from page 18) has a cross-indoor stockyard. The scrap steel used is relatively strict in management, the rust content is low, and various auxiliary materials are properly protected from moisture. In addition, some hydrogen can be removed under high-speed decarburization conditions. The hydrogen in the steel before the VD treatment is maintained at (6~8) X 106, and after VD vacuum treatment, it can reach 2<10 6 or less. VD uses an on-line hydrogen meter for hydrogen process control, which can quickly obtain accurate hydrogen content and determine VD high vacuum holding time.
4 Conclusion The concept of pure steel is actually very historic. As users become more and more demanding on the performance of steel products and the development of the steel industry itself, the former “pure†steel may be today. It is already of inferior quality. Therefore, only by continuously improving process measures and strengthening process control can we keep up with the pace of development of pure steel
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