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Threaded fasteners
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Proceedings Papers
HT 2021, Heat Treat 2021: Extended Abstracts from the 31st Heat Treating Society Conference and Exposition, 33-37, September 14–16, 2021,
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This paper discuss recent developments in mesh belt heat treating systems used in the production of automotive fasteners. Methods for heat treating threaded fasteners have evolved significantly over the last 20 years as low-capacity shaker hearth, rotary hearth, and plate-belt systems are replaced by soft handling mesh belt heat treatment systems. Design innovations for improving the accuracy of tempering furnace tolerance bands and integrating inline zinc phosphate removal systems are discussed along with their respective benefits.
Proceedings Papers
HT 2019, Heat Treat 2019: Proceedings from the 30th Heat Treating Society Conference and Exposition, 185-192, October 15–17, 2019,
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This paper discusses the basic principles of multi-frequency eddy current testing and explains how it can be used on high-volume production lines to detect faulty heat-treated parts based on case depth, hardness patterns, tensile strength, carbon content, soft spots, and surface decarburization. It also presents examples showing how the method is used in high-speed inspection of cam shafts, screws, balls of various sizes and materials, distance pins, and complex bolts.