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Analysis Of Minimum Safe Cycle Time In Injection Molding: Selection Of Frozen Layer Thickness

Chang, Keh-Chyou
http://rave.ohiolink.edu/etdc/view?acc_num=osu1212609470

Abstract Details

2008, Master of Science, Ohio State University, Industrial and Systems Engineering.
The largest component of the injection molding cycle is the cooling time. Thus it is highly desirable, to be able to predict what its minimum acceptable value can be. This is becoming even more important with increased competition from regions where the labor cost is low. In an injection molding operation, the mold thermal state changes from its initial value until a quasi steady state is reached. The minimum required cooling time increases with continuous molding until a steady state value is achieved. Improving the mold thermal design will decrease the cooling time thus reducing total cycle time. The overall goal of this work is to develop a simple reliable method to predict a minimum safe cycle time for steady manufacturing. The first part of the thesis describes software capable of simulating the thermal state of the part and the mold for multiple injection molding cycles while balancing simulation time with results accuracy. Three case studies are presented, one done in our labs and two on-site at an automotive manufacturing facility. The three case studies are used to evaluate the ability of the software to predict part surface temperature for continuous molding. The second part of the thesis, evaluates, the minimum frozen layer thickness required before the part can be demolded and how the growth of this frozen layer is affected as the mold thermal state changes with continuous molding cycles. Experiments are conducted in our labs to relate the minimum frozen layer thickness to part dimensional stability. Based on these experiments, an ejection criterion is selected in order to obtain a minimum safe cooling time.
Jose M. Castro, Doctor (Committee Chair)
Allen Yi, Doctor (Committee Member)
116 p.
Engineering; Industrial Engineering; Plastics; Polymers
Injection Molding; Cycle Time

Recommended Citations

Citations

  • Chang, K.-C. (2008). Analysis Of Minimum Safe Cycle Time In Injection Molding: Selection Of Frozen Layer Thickness [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1212609470

    APA Style (7th edition)

  • Chang, Keh-Chyou. Analysis Of Minimum Safe Cycle Time In Injection Molding: Selection Of Frozen Layer Thickness. 2008. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1212609470.

    MLA Style (8th edition)

  • Chang, Keh-Chyou. "Analysis Of Minimum Safe Cycle Time In Injection Molding: Selection Of Frozen Layer Thickness." Master's thesis, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1212609470

    Chicago Manual of Style (17th edition)

osu1212609470
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© 2008, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.