Press monitoring boosts operating time

Long runtimes and precision are needed for industrial presses.

Modern industrial production would be unthinkable without presses. The range of products extends from coins to large automobile parts. Presses run at up to 800 strokes per minute.

The quality of the workpieces that are produced must nevertheless always remain constant.

One way to achieve this is by using HBM sensors and PMX press monitoring. PMX measuring chains record pressing forces as they occur with absolutely no interference, either in a direct force flow or in a force shunt measurement. The high resolution of the PMX, 24 bits, also makes it possible to record very small partial forces. For example, sensors based on strain gauges and carrier frequency amplifiers can be placed on each column of a 2-/4-frame press. PX455, the four-channel measuring card for full and half bridges, force transducers and load cells reliably records these signals.

Internal calculation channels analyze the measurement signal in terms of its curve and peak forces. The PX878 multi input/output card has a total of eight digital inputs, eight digital outputs and five analog outputs. This makes it possible to calculate limit values quickly in up to 50 µsec, which ensures a high level of machine protection. The analog outputs can be used for output of measurement or computing channels – ideal for service and maintenance.

PX01PN, the Profinetcard with IRT protocol, ensures that these reliably predictive signals are directed via real-time Ethernet interfaces to the press controller, so that the press parameters can be readjusted.

With an automation system concept of this kind, press manufacturers can increase the runtime and quality of their presses while lowering maintenance costs. The concept is becoming increasingly common in retooling, i.e. retrofitting or upgrading presses.

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