Die Pressure

1.) The hydraulic pressure of the stock measured in the die cavity. 2.)A pressure die is used to improve lubricant uptake to enable hydrodynamic lubrication. A pressure die composed of two dies. The first die is 7% to 10% larger than the incoming wire diameter so that a narrow gap exists between the die and the incoming wire surface. The second die is the working die in which the actual reduction occurs. The gap size is very important: if it is too narrow, lubricant take-up on the wire will be reduced, preventing hydrodynamic lubrication; if it is too big, there will be no pressure build up in the working die and lubrication will be equivalent to a conventional die. See Hydrodynamic Drawing.