Punches pressure tolerance

The pressure tolerance depends on the smallest diameter of the punch, e.g., the backing-off lathe at the punch tip and the cup depth. It is calculated from the load capacity of the tool steel. A guide for maximum pressure tolerance is given in Table 3. 

Once the material is selected and the component information is drawn from the database directly, the CAD Module is called in and the process parameters to produce the components such as punch pressure, punch force, tolerances are recommended. The punches are designed and material information of both punches and dies is made available to the user. 

Any clearance between the die wall and the punch affects the tableting behavior, as entrapped air will escape through the gap when pressure is applied. Fig. 9 presents the terminology. Table 1 summarizes manufacturing tolerances of punches and dies as well as the clearance between them. 

Table 11.9. Standard Tolerance Guide for Punched Holes and Slots in High-Pressure Laminated Grades of Sheet Stock, Rods, and Tubes, as Classified by the National Electrical Manufacturers Association (NEMA)...

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