1、 英文资料 Methods to study stamping forming The objective of the stamping forming research is to realize and apply the principles to solve various engineering problems through study on the stamping forming procedure. Recently, the research on stamping has been carried out in wide range with various meth
2、ods. The research can be summed up substantially into following types. The double line arrows in the picture denote the procedure of formal theoretical research. In such research, the actions of the equipment and die are decomposed into micro-ingredients of the force and applied on the microstructur
3、e of the metal according to the multi-crystal microstructure of the deformation metal, the deformation of the metal microstructure is then investigated and the deformation of the microstructure to macro-deformation of the sheet metal is summed up. This scientific method is perfect, but current devel
4、opment in mechanics and metallurgy cannot meet such demand, therefore this kind of formal theoretical research is still in burgeoning, and is not applicable in practice. Since the formal theoretical research method encounters formidable difficulty, a kind of simplified theoretical method appears in
5、the research field of the stamping forming. The characteristic of this kind of research method is denoted by continuous line in the picture, which is the main trend of the recent research. This research assumes metal as the ideal homogeneous solid and simplifies the property parameters, the boundary
6、 conditions and the blank geometrical parameters of the metal, the stamping process and principle are analyzed and described by mathematical method. Naturally, the assumptions adopted in the analysis would induce some deviation between the real stamping process and its simulation. The result is cert
7、ainly approximate and does not reflect the real stamping process completely. Especially in analyzing complex stamping forming, this theory is not so valid. In recent years, due to the development of the finite element method and computer technology, this kind of theoretical method has greatly progre
8、ssed, it shows applicable prospect even in analyzing complex stamping forming. The application of this kind of theoretical method mainly focuses on some special stamping deformation investigation, and it is expected that more achievements can be obtained in the fundamental principle of stamping form
9、ing. On the other hand, due to the simplification and assumptions, experiments are indispensable to test the validity of this theory. The third method to study stamping forming is shown by dashed dotted line in the picture. The characteristic of this method is that ignoring the deformation process o
10、f the blank under the action of the load during stamping forming conditions (including the structure of the die, the geometrical parameters of the die working portion and the properties of the stamping equipment) with the final results of the stamping forming. It is a rational empirical method, and
11、widely used in stamping technology filed in recent years. This method is intuitional, simple and easy to be adopted by engineers, but it cannot be used to reveal the real procedure of the stamping deformation, so it is not the radical method to investigate the principles of the stamping forming more
12、 thoroughly and its usage is strictly limited. The fourth method to study stamping forming is denoted by dashed line in the picture. Based on the fundamental knowledge of the mechanics and metallurgy, the essential characteristics and principle of the stamping forming are investigated to solve the p
13、ractical problems in stamping process. In comparison with other plastic processes, the characteristics of the stamping forming, the principles of the sheet metal deformation are unique. So this method has definitely aim and the analysis results can be used directly to solve different problems in sta
14、mping forming. The characteristics and effects of this research of this research of this research method are illustrated by following examples. (1)The sequence of the stamping process can be decided by the trend rule of the stamping deformation. (2)According to the rule of uniform velocity distribut
15、ion in the outer flange of the deformation zone during multi-pass deep drawing for the box parts, the shape and dimension of the blank during process sequence can be calculated. Therefore the calculation the for deep box parts of the multi-pass deep drawing technology is based on scientific foundati
16、on to improve the technique level of stamping forming. (3)According to the research on the wrinkle during the sheet metal forming caused by non-uniform tensile and shearing force, a new research field is developed beyond the traditional compressive instability theory. The results obtained offer an e
17、ffective measure to cope directly with wrinkle during stamping forming. (4)The theory of sorting stamping forming based on the characteristics of the stamping deformation and mechanics and mechanics is an easy approach to systematize of the stamping forming, and can be used to deepen the investigati
18、on on stamping forming limit, to point out a clear and definite direction for improve the stamping forming limit. Above examples indicate that this method is closely relevant to the real stamping forming process. It can be used to analyze and solve the stamping forming problems effectively. Although this method is in the junior stage, mainly focusing on the qualitative analysis for stamping forming now . With the constant progress of this method and combined with modern mechanics, the breakthrough of this method is
