畢業(yè)設(shè)計中英文翻譯資料--沖壓成形與板材沖壓-wenkub
2023-01-28 06:34:45 本頁面
【正文】 can also be formed by stamping. 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, etc. The process, equipment and die are the three foundational problems that needed to be studied in stamping. The characteristics of the sheet metal forming are as follows: (1) High material utilization (2) Capacity to produce thinwalled parts of plex shape. (3) Good interchangeability between stamping parts due to precision in shape and dimension. (4) Parts with lightweight, highstrength and fine rigidity can be obtained. (5) High productivity, easy to operate and to realize mechanization and automatization. The manufacture of the stamping die is costly, and therefore it only fits to mass production. For the manufacture of products in small batch and rich variety, the simple stamping die and the new equipment such as a stamping machining center, are usually adopted to meet the market demands. The materials for sheet metal stamping include mild steel, copper, aluminum, magnesium alloy and highplasticity alloysteel, etc. 2 Stamping equipment includes plate shear punching press. The former shears plate into strips with a definite width, which would be pressed later. The later can be used both in shearing and forming. of stamping forming There are various processes of stamping forming with different working patterns and names. But these processes are similar to each other in plastic deformation. There are following conspicuous characteristics in stamping: （ 1）． 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 forming can be treated approximately as that of the plane stress state to simplify vastly the theoretical analysis and the calculation of the process parameters. （ 2）． Due to the small relative thickness, the antiinstability capability of the blank is weak under pressive stress. As a result, the stamping process is difficult to proceed successfully without using the antiinstability device (such as blank holder). Therefore the varieties of the stamping processes dominated by tensile stress are more than dominated by pressive stress. （ 3）． During stamping forming, the inner stress of the blank is equal to or sometimes less than the yield stress 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 deformation zone to the forming limit and the deformation resistance is not so important as to the bulk forming. In some circumstances, such influence may be neglected. Even in the case when this influence should be considered, the treating method is also different from that of bulk forming. （ 4）． In stamping forming, the restrain action of the die to the blank is not severs as in the case of the bulk forming (such as die fing). In bulk forming
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