Title page for ETD etd-0427103-132453

Document Type	thesis
Author Name	Jenoski, Raymond Andrew
URN	etd-0427103-132453
Title	Measure and Correction of Sweep in Strip Steel
Degree	MS
Department	Mechanical Engineering
Advisors	Robert L. Norton, Advisor Eben C. Cobb, Committee Member Yong Mo Moon, Committee Member Gretar Tryggvason, Committee Member John M. Sullivan, Graduate Committee Rep
Keywords	thermal stress transient conduction 440 steel
Date of Presentation/Defense	2003-04-21
Availability	unrestricted
Abstract The hardening line at Gillette processes strip steel at 120 ft/min from a reel 25 miles long. The hardening line quickly heats and quenches the strip. This process transforms the strip from an annealed austenite to a hardened martensite structure. The quality of their razor blades is controlled by, among other methods, measuring and controlling blade sweep. Sweep is defined as the devaition of a steel strip's neutral axis from a straight line over a given chord length that occurs from thermal stress during phase transformation. The thermal stress applied to strip during phase transformation is adjusted via a quenching device that contains a manual screw adjustment. Research was conducted to analytically model the heat transfer occuring between the strip and quench device. A production hardening line was equipped with an automated screw adjustment and empirical data was obtained for comparison to the analytic models. A transfer function that correlates screw-adjustment to sweep was obtained. An algorithm was designed for correcting sweep via a closed-loop system that implements this transfer function.
Files	Jenoski.pdf

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