Date of Award
Mechanical, Automotive, and Materials Engineering
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During machining, cutting forces exerted on a toolholder will cause its shank to bend within the spindle. If the shank's deflections are larger than the gap separating the two surfaces, impacting will occur. The repetitive impacting motion between the spindle and toolholder results in a fretting condition. Over time, this will lead to wear and corrosion damage that is costly to repair and can potentially affect machining performance. Typical means of dealing with fretting include the use of surface treatments such as coatings or the use of wear resistant materials. However, these are only treatments and not solutions. Although they may reduce fretting damage, they do not prevent the fretting condition. The proper solution would be to prevent the contact that causes the fretting. Through finite element simulations and experimental testing, modal analysis was performed on various toolholder designs. Since different designs will have different dynamic characteristics, the goal was to find those designs that would minimize shank deflections, and thus minimize fretting damage. Two types of toolholders were studied: straight shank and tapered shank. The design of each was altered by varying the overall length and diameter. Within typical operating frequencies, it was generally found that shank deflections were less in tapered designs than in straight designs and that the deflections decreased as the length of the toolholder decreased. Increasing the diameter had no significant effect on deflections. By understanding how design modifications can affect shank deflections, a toolholder can be created to minimize the chance of fretting.Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1998 .J68. Source: Masters Abstracts International, Volume: 39-02, page: 0583. Advisers: W. North; R. Du. Thesis (M.A.Sc.)--University of Windsor (Canada), 1998.
Jouraij, Joseph., "Controlling toolholder fretting through design modification." (1998). Electronic Theses and Dissertations. 1571.