Method and apparatus for the characterization and control of powder compaction

摘要

A method and device for characterizing the compaction result of a powder and monitoring the compaction of the powder during the compaction process. In the method sound emission produced by the compaction process is measured by a sensor and transformed into a frequency spectrum in which the sound intensity is presented as a function of frequency. The intensity of the band relating to the sound emission arising from the compaction of the powder is recorded using different compressive forces, and the compaction result is obtained as a function of the intensity of the band relating to the sound emission arising from compaction. The device includes a roller compactor, a microphone disposed proximate to the roller compactor, an amplifier connected to the microphone, an analog/digital converter connected to the amplifier, a frequency analyzer connected to the converter, a monitor connected to the analyzer, a regulator for detecting deviation between a value from the monitor and a set value from a standard spectrum and generating a control signal on the basis of the detected deviation, and an actuator for adjusting the roller compactor to vary the compressive force applied to the powder during compaction, the actuator being activated by the control signal generated by the regulator.