Metal Injection Molding Process Parameters as A Function of Filling Performance of 3D Printed Polymer Mold

Abstract

Metal injection molding (MIM) is a swift manufacturing process, which can produce complex and intricate parts with good repeatability and accuracy. However, to quickly address low-volume demands of customized MIM parts, manufacturing of mold could be a potential challenge. Typically, machined metal molds are used for MIM, but they are expensive and need more lead time. The machined metal mold becomes useless once the design is changed or requirement of MIM parts is met. Therefore, for MIM production of a low volume of highly customized parts, machined metal mold could be substituted by 3D printed polymer molds. However, knowledge of filling behavior of MIM feedstock in polymer mold is a grey area, which demands study to investigate the effects of injection parameters on mold filling. The present study investigates the effects of machine injection parameters on feedstock filling behavior in 3D printed polymer molds. An attempt has been made to determine the trend of feedstock filling in the polymer mold as a function of injection parameters. Further, the design of experiment (DOE) has been used to estimate the weight of injection parameters.

Characterization of Green Part of Steel from Metal Injection Molding: An Analysis Using Moldflow

“…Confidence to fill, resulting from Moldflow ( Figure 3 a), revealed that the entire body of the green part has high value (green color) and no indication of the occurrence of short shot. It was suggested that processing conditions were deemed incorrect if confidence of fill result was low [ 24 ]. One of the Moldflow results is pressure drop, as shown in Figure 3 b.…”