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A Morphing Extrusion Die for Manufacturing of Thermoplastic Hoses

Gilmore, Paul
http://orcid.org/0000-0002-1323-1794
http://rave.ohiolink.edu/etdc/view?acc_num=osu1429799958

Abstract Details

2015, Master of Science, Ohio State University, Mechanical Engineering.
Thermoplastic hoses are manufactured in an industrial process where molten plastic comes out of an extruder as an unshaped tube, and then goes through a precisely machined sizing die that forms its outer diameter. The hose then enters a vacuum chamber which maintains a set thickness and shape while it cools and solidifies to its finished size. The final diameter must satisfy a tight tolerance, and the line operator can regulate the vacuum pressure, extruder speed, and puller speed to stay within these limits. However, during startup and before steady state operation is reached, these control variables are often inadequate for maintaining the required diameter. This results in scrap generation, which is an unwanted and potentially preventable cost for the manufacturer. Therefore, the goal of this thesis is to develop a morphing die with a programmable inner diameter that can be set by the operator to regulate the size of the finished tube during transient extrusion conditions. It is expected that this direct control of the die diameter will significantly reduce scrap and be a cost savings for the manufacturer. The work here includes the research, analysis, and design necessary for evaluating the feasibility of a morphing die for use in a thermoplastic extrusion line. From qualitative and quantitative analysis performed in this thesis, different combinations of die materials, die designs, and actuation mechanisms are identified. The candidate that best meets the shop floor requirements is identified to be a combination of a superelastic alloy, self-centering actuation mechanism and an electric motor. The specifications for a complete morphing die are recommended for subsequent development.
Vishnu-Baba Sundaresan (Advisor)
Amos Gilat (Committee Member)
75 p.
Mechanical Engineering
morphing; superelastic alloys; Nitinol; thermoplastic hoses

Recommended Citations

Citations

  • Gilmore, P. (2015). A Morphing Extrusion Die for Manufacturing of Thermoplastic Hoses [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429799958

    APA Style (7th edition)

  • Gilmore, Paul. A Morphing Extrusion Die for Manufacturing of Thermoplastic Hoses. 2015. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1429799958.

    MLA Style (8th edition)

  • Gilmore, Paul. "A Morphing Extrusion Die for Manufacturing of Thermoplastic Hoses." Master's thesis, Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429799958

    Chicago Manual of Style (17th edition)

osu1429799958
681
© 2015, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.