Measurement of injection molding and machining process using ultrasonic technique

Abstract

In this study, several measuring techniques by using uluasonic waves have teen developed. The measured physical quantities are I ) the solidification behavior of the filled plastics in a cavity. 2) the pressure in a cavity, 3) the melted behavior of resin pellets in the barrel, 4) the thickness of the molded parts, S) the velocity of sound of the molded parts, in the injection molding process, 6 ) the workpiece shape and roughness in the machining process, 7) the surface condition of a grinding wheel, 8) the solidification behavior during the curing process of adhesive and so on. These quantities are obtained by measuring the amplitude and traveling time of ultrasonic waves.

A review of current developments in process and quality control for injection molding

“…[76][77][78][79][80] It was reported that ultrasonic sensors had been employed to investigate a wide range of process characteristics such as the melting behavior of the resin in the injection barrel, temperature and pressure variation in the nozzle, melt-front flow inside the cavity, cavity pressure, solidification behavior in the cavity, polymer orientation, and some quality responses such as part dimension.…”

“…For example, by using ultrasonic transducers, both the melt-front velocity in the filling stage and the gap between the part and mold wall surface during cooling can be detected. 78 It is expected that the innovative quality sensor will eventually enable quality control. Otherwise, one has to refine the generic, first-principle model and construct the "virtual sensor" for quality response, which is not trivial work either.…”