Punch systems, multiple

Multiple punch systems are often referred fo as gang punch systems. These machines are commonly configured for a particular part and panel size. For example, a 150-mm panel width and a 10-mm square component size arranged in a 15 x 15 matrix can be rapidly punched by simultaneously activating one punch for each of the 225 component locations. The tape layer can then be moved to the next desired via location and all 225 punches (1 per 10-mm component area) are then activated simultaneously to form 225 vias in the time that would normally be required to form 1 via in a standard CNC punching system. Obviously, this approach dramatically improves the speed of the via-formation process in a given layer. However, some flexibility... 

Instrumented tablet presses with computer interfaces allow the pharmaceutical scientist to study the mechanism of compaction and the relationship of the mechanism to tablet-compaction properties and formulations. In addition, automated systems are useful to develop compression profiles for reference purposes, to control weight of tablets during development and production, and to monitor punch wear. This automation reduces the burden on personnel faced with the requirements of quality control. Merck Sharp and Dohme s major production facility in the United Kingdom is fully computerized to manufacture a high-volume tablet product as well as multiple-tablet products. " ... 

Multiple-action pressing Multiple-action pressing systems are those that support and compact each level of multilevel parts with a separate punch or tool member. Such tooling is used to minimize density gradients in complex compacts. Therefore, all of these more sophisticated machines also use one or the other method of double-motion pressing, as demonstrated in Figure 216. With the above descriptions the figures are self-explanatory. 

Figure 216. Schematic representations of three multiple-action tooling systems. (a) Upper and lower punches pressing, die stationary, (b) Upper punches pressing, floating withdrawal die. (c) Upper punches pressing, controlled withdrawal of die and lower punches...

The above example illustrates screening at its simplest. In practice, screens are more often multiples of 8 bits, to accord with normal computer practice they may be open-ended [i.e. of variable length) rather than fixed length, and may be combined or superimposed in various ways. The technique. of superimposed coding was first developed by Mooers for a purely mechanical punched card system, but has since been incorporated into a highly sophisticated computer system... 

This is a design whose time has really come with the advent of high-performance closedloop servo drives and the use of computers as system controllers. Feed rolls should be considered if your parts have complex hole patterns with many dimensional variations. Traditionally, multiple dies and very large presses would be required. The more common arrangement for this type of system is shown in Fig. 19. The punch tools inside the die are selectable by moving blocks over the... 

FR-2 is comprised of multiple plies of paper impregnated with a flame-resistant phenolic resin. It possesses good punching characteristics and is relatively low in cost. It has typically been used in simple applications such as radios, calculators, and toys, where dimensional stability and high performance are not required. FR-3 is also paper-based, but uses an epoxy resin system. 

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