Download Computer Applications in Near Net-Shape Operations by S. K. Ong, A. Y. C. Nee (auth.), A. Y. C. Nee PhD, S. K. Ong PDF

By S. K. Ong, A. Y. C. Nee (auth.), A. Y. C. Nee PhD, S. K. Ong PhD, Y. G. Wang PhD (eds.)

Having edited "Journal of fabrics Processing expertise" (previously entitled "Journal of Mechanical operating Technology") for shut on 25 years, i've got obvious the numerous dramatic alterations that experience happened within the fabrics processing box. long past are the times while the one "materials processing" performed was once nearly the forming of traditional metals and alloys, and while the improvement of a brand new product or approach in numerous circumstances referred to as for numerous months of repetitive trial-and-error,' with many (mostly instinct- or experience-based) dear and time-consuming ameliorations being made to the dies, until eventually good fortune was once completed. even if a 'successful' product used to be shaped, its mechanical houses, when it comes to springback and dimensional accuracy, thickness diversifications, residual stresses, floor end, and so on. , remained to be decided. Bulk-forming operations often required pricey machining to be performed at the product to impart the necessary dimensional accuracy and floor fmish. through the years, the experience-based craft of steel forming has given option to the technology of fabrics processing. With using the pc, forming operations should be simulated with accuracy, to figure out the easiest forming course and the linked forming a lot and die stresses, and to foretell the mechanical houses of the shaped product, even right down to its floor texture.

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___ 0 •• _ . __ • • • _.. ® ···············,ffi··· . . ) . . . @ . ! · Tffi @ . . . · - ......... _ .... _-_ ................ --_ ... _-_ .. -..... - ................... _-_ ............... - ....................... " . : . 34: Split die construction. In designing progressive dies of split construction, the rules listed below are usually followed. 1. , the dividing lines should be perpendicular to the feeding direction. 2. The machining errors of the die sections should be compensated to facilitate adjustment and improve the accuracy of the assembly.

Most fme blanking dies are compound dies so that holes on the parts may be punched simultaneously. 20 shows a typical die used in fme blanking. 20: Fine blanking die: (1) punch-die, (2) blank holder, (3) die, (4) ejector, (5) punch. Chapter 2: CAD/CAM for sheet metal forming and related processes _ _ _ _ _ _ _ 27 Materials used in fme blanking should have good plasticity to prevent tearing during the blanking process. 35% produce satisfactory results in fine blanking. 70%, annealing should be carried out before fine blanking.

Dum. Before coding, a co-ordinate system is created where the drawing of the blanked part is put in the first quadrant. The contours of the part are numbered. The number of the outermost contour is 1, and the inner contours are 2, 3 and so forth. The elements of the outermost contour and inner contours are numbered in counter clockwise and clockwise directions respectively. Next, the elements can be described according to the coding scheme. 24, the data defIning its shape are listed below. 30 (.................

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