STAMPING AND SHEET METAL FORMING——冲压成形和板材冲压【中英文.doc
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1、STAMPING AND SHEET METAL FORMING冲压成形和板材冲压【中英文对照】STAMPING AND SHEET METAL FORMINGStamping is a kind of plastic forming process in which a part is produced by means of the plastic forming the material under the action of a die,stamping is usually carried out under cold state, so it is also called stam
2、ping, heat stamping is used only when the blank thickness is greater than 8-100mm.the blank material for stamping is usually in the form of sheet or strip, and therefore is it also called sheet metal forming. Some non-metal sheets (such as plywood. Mica sheet, asbestos. Leather) can be formed by sta
3、mping.Stamping is widely used in various fields of the metalworking industry. And it plays a crucial role in the industries for manufacturing automobiles. Instruments. Military parts and household electrical appliances. EtcThe process, equipment and die are the three foundational problems that neede
4、d to be studied in stamping.The characteristics of the sheet metal forming are as follows;high material utilizationcapacity to produce thin-walled parts of complex shapeGood interchangeability stamping pares due to precision in shape and dimension.Parts with lightweight. High-strength and fine rigid
5、ity can be obtained.High productivity. Easy to operate and to realize mechanization and autoimmunization.The manufacturer of the stamping die is costly. And there pore it only fits to mass production for the manufacture of products in small batch and rich variety. The simple stamping die and the new
6、 equipment such as a stamping nothing center are usually adopted to meet the market demands.The materials for sheet metal stamping include mild steel. Copper, Aluminum, Magnesium alloy and high-plasticity alloy-steel, etc.Stamping equipment includes plate shear punching press. The former shears plat
7、e into strips with a definite width, which would be pressed later, the later be used both in shearing and forming.2, characteristics of stamping formingThree are various processes of stamping forming with different working patterns and names. But these processes are similar to each other in plastic
8、deformation. These are following conspicuous characteristics in stamping;The force per unit area perpendicular to the blank surface is not large but is enough to cause the material plastic deformation it is much less than the inner stresses on the plate plane directions. In most cases stamping formi
9、ng can be treated approximately as that of the plane stress state to simplify vastly the theoretical analysis and calculation of process parameters.Due to the small relative thickness, the anti-instability capability of the blank is weak under compressive stress. As a result, the stamping process is
10、 difficult to proceed successfully without using the anti-instability device; therefore the varieties of the stamping processes dominated by tensile are more than dominated by compressive stress.During stamping forming the inner stress of the blank is equal toor sometimes less than the yield stress
11、of the material in this point, the stamping is different from the bulk forming, during stamping forming, the influence of the hydrostatic pressure of the stress state in the bulk forming. In some circumstances, such influence may be neglected. Even in the case when this influence should be considere
12、d, the treating method is also different from that of bulk forming.In stamping forming. The restrain action of the die blank is not severs as in the case of the bulk forming, in bulk forming. The constraint forming is preceded by the die exactly the same shape of the part. Whereas in stamping. In mo
13、st cases. The blank has a certain degree of freedom. Only one surface of the blank contacts with the die. In some extra cases, such as the forming of the blank on the deforming zone contact the die.The deformation in these regions is and controlled by the die applying an external force to its adjace
14、nt area.Due to the characteristics of stamping deformation and mechanics mentioned stamping technique is different form the bulk metal forming;The importance or the strength and the rigidity of die in stamping forming that in bulk forming because can be formed without applying large area on its surf
15、ace. Instead. The simple die and the pneumatic forming are developed.Due to the plane stress or simple strain state in comparison with research on deformation or force and power parameters has been done, stamping forming can be performed by more reasonable scientific methods, based on the real time
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