Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 111, Issue 1-3, Pages 219-224Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0924-0136(01)00543-X
Keywords
ceramic injection molding; jetting in sprue; melt front asperity; counter-flow joining; welding defects; welding-defect elimination criterion
Ask authors/readers for more resources
Melt front roughness was examined firstly, and it was found that an injected part is separated into two regions: a rough surface region and a fine surface region. The rough surface region results from melt front asperities generated by the blowout of voids at the front surface which an mixed into the material by jetting flour in the sprue. It war also found that voids in the sprue can be eliminated by applying counter-pressure. Secondly, the generation property of welding defects, weld line and voids, has been examined by counter-flow joining and their elimination criteria are obtained. It was shown that both criteria approximately coincide with each other. The welding-defect elimination criterion obtained is applied to the evaluation of welding-defect generation under various injection conditions and it was found that the criterion does not depend greatly on the asperities of the flow front. Furthermore, the criterion is also effective for estimating welding defects in injection molding using a mold cavity with inserts. Finally, it was confirmed that the above criterion approximately coincides with that in a previous paper which was obtained by the use of simple void-reducing conditions in the joining of green ceramic blocks with artificially grooved surfaces. (C) 2001 Published by Elsevier Science B,V.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available