The basic characteristics of stamping process

Used for the production time stamping process there are a lot of hungry name has a variety of forms, but plastic deformation is essentially the same. Stamping has the characteristics of several very prominent. ( 1) In vertical direction of the board face pressure per unit area, its value is not defecate is enough to make the plate on the direction of the plate plastic deformation. Because the pressure on unit area perpendicular to the surface direction is far less than the quality of the panel on the direction of stress, so most of the stamping deformation can approximatively regarded as plane stress state, the analysis and calculation of process parameters of large deformation mechanics work? Feeling is greatly simplified. ( 2) As a result of the stamping with embryo the relative thickness of the plate is very small, so the compressive stress under the action of buckling resistance is also very poor, so without buckling resistance devices ( Such as pressure to coil, etc. ) Conditions, it is difficult to successfully finish stamping forming process under free state. Is given priority to with tensile stress effect, therefore, the elongation of class stamping process than is given priority to with compressive stress effect of compression forming process. ( 3) Stress in sheet stamping forming, MAO embryo value equal to or less than the yield stress of the material. At this point, stamping and forming size difference is very big. Stress state during stamping deformation zones, therefore, the hydrostatic pressure component influence on forming limit and deformation resistance, has lost its volume in forming an important degree, in some cases, even can not be considered completely, even if it is necessary to consider, the processing method is not the same. ( 4) In stamping, die sheet of hair embryo force formed by the constraints of the role of lighter, unlike volume forming ( Such as die forging) Is to rely on parts with exactly the same shape of cavity for implementing comprehensive contact MAO embryo enclosed. In stamping, in most cases, the plank MAO embryo have some degree of freedom, are often only a surface in contact with the mould, and even sometimes there have to mold plate on both sides of the surface contact deformation of the part. In this case, the deformation of the part of hair embryo is on mold on the adjacent part of the external force to achieve its control function. Conical surface and spherical parts forming, for example, the suspended part and the end of tube embryo when edge forming belong to this kind of situation. Because the stamping has some of these aspects of the deformation and mechanics characteristic, the stamping technology and formed some characteristics different from bulk forming. Because you don't need to plate the surface of the hair a lot of unit pressure can make its forming, so the stamping technology of mold strength and stiffness of the study is not very important, but instead developed many simple mould technology. For the same reason, also prompted by gas or liquid pressure forming process to develop. Plane stress state when stamping or more pure strain state ( In comparison with bulk forming) , the current in stamping forming of deformation and force of hair embryo can parameters research thorough, reasonable use of conditional scientific method of stamping processing. With the help of the electronic computer and advanced testing means, in the performance of plate stamping and deformation parameters in real time measurement and analysis, based on the realization of stamping process intelligent control research work are also carried out. People have to leave in the stamping process, after more in-depth understanding of recognises that stamping molding and raw materials have a very close relationship. So, the formability of sheet stamping performance and shape stability research, at present has become one of the important contents of stamping technology. Research on the properties of sheet metal stamping is not only the needs of the development of stamping technology, but also promote the development of the iron and steel industry production technology, to improve the quality of plate for its provides a reliable foundation and basis.