Analysis of Dimensional Variation of Injection-Molded Part

With the aim to reduce the dimensional variation of the injection molded part in precision molding, relations between the dimensional variation and the molding factors have been studied. Three factors for the dimensional variation were deduced: packing (filling into the cavity and compression), ther...

Full description

Saved in:
Bibliographic Details
Published inKOBUNSHI RONBUNSHU Vol. 39; no. 5; pp. 351 - 358
Main Authors YOSHII, Masaki, AOKI, Masayoshi, SATO, Hidemi, KANEDA, Aizo
Format Journal Article
LanguageJapanese
Published The Society of Polymer Science, Japan 25.05.1982
Subjects
Cavity Pressure
Dimensional Variation
Injection Molding
Polyacetal
Online AccessGet full text

Cover

More Information
Summary:With the aim to reduce the dimensional variation of the injection molded part in precision molding, relations between the dimensional variation and the molding factors have been studied. Three factors for the dimensional variation were deduced: packing (filling into the cavity and compression), thermal expansion (or shrinkage) and crystallization factor). A new concept, the integration of the cavity pressure against time lapse, was introduced to elucidate the relationship between the packing state and the dimension of the molded part. For the cylinderical part molded with polyacetal, relations between the dimensional variation and the molding conditions (injection pressure, holding pressure, mold temperature, material temperature) were obtained experimentally. These relations were explained in terms of the three factors. The results show that the relations can be utilized for the quantitative molding control of the dimensional variation of the injection molded parts.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.39.351