Machine Parts

Press tonnage:   Determine the die press tonnage for the given stock size of ½*2*2 inch made of cold rolled steel. Given that the shear strength of the material is 58 kg/inch. Press tonnage: The tonnage of a press is the force that the press ram is able to exert safely. What is the advantages of progressive die over compound die :   Progressive dies performs two or more operations at different stages every time the ram descends while a compound die performs two or more operations during one stroke of the press at one station only. But compound die is slower than progressive die. Moreover, progressive dies have advantages in case of long strip of material.

Progressive die : The dies which performed two or more operations at different stages every time the ram descends is known as Progressive die.   The principle advantage of Progressive die is in the number of operations that can be achieved with one handling of the stock strip. The main disadvantage is that work pieces may become “dished” as they pushed through the die as they generally have very little support. Compound die : A compound die differs from a progressive die in that it performs two or more cutting operations during one stroke of the press at one station only.   Compound dies are slower in operation than progressive dies but they have advantages for certain jobs, especially where tolerance are close (1) the cutting operation, by the action of the knockout plate ,ensures flatness of the blank.2 Large parts can be blanked in a smaller press if compound dies rather than progressive dies are   used. Combination dies:   A die in which a cuttin