Dsign of Die

2.17. DESIGN PROCEDURE FOR PROGRESSIVE DIES A progressive soften, overly known as cut-and-carry die, is a multi station die that performs several(prenominal) operations in succession in a wholeness stroke of the press ram. The various operations may be all cutting operations or a faction of cutting and forming operations. The first step in the design of the die is the development of the blank. For this, the direction of metal grain is kept in mind. Normally, the grain of coiled strip is parallel to its length. To eliminate either tendency to fracture, the forming operating atomic number 18 usually performed perpendicular to the grain. Thus, term making a scale labout of the developed blank, the bend make is kept perpendicular to the strip. The next step is to plot the potential design of the scrap strip. In a progressive die, the several(prenominal) operations (which atomic number 18 normally relatively simple) are feature in several stations. Due to this, it is usually difficult to spud the most practical and economical strip design for best operations of the die. However, when establishing the sequence of operations for progressive dies, the following strike lines should be considered : While evolving the strip design, the positioning and proper fix of the stock in each station is of prime importance.

For this, pilots are incorporated in the die. Advantage should be taken of any required holes in the workpiece for pilot. This method is known as assume piloting. Thus piering operations must be primed(p) first in the sequence. However, sometimes (when direct piloting is not ideal or satisfactory) special piloting holes can e placed in the scrap part of the strip. This is called Indirect piloting. Advantages of indirect piloting are : greater freedom of coat or location and not affected by workpiece change. However, the textile width and lead may increase. Care must be taken to avoid having pierced holes tool close to a bend. Distribute pierced areas over several stations if they are close together... If you want to get a full essay, club it on our website: Orderessay

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