Abstract
Optimization of Spheroidized Process Parameters for Two AISI 1022 Steel Wires Using Taguchi Approach
Highlights
The manufacturing processes of fasteners generally include wire-manufacturing, forming, heat treating, coating
Materials and Methods In this study, the wires are spheroidizing annealed after drawing AISI 1022 steel wire coils WA (Φ5.5mm) and WB (Φ6.5mm) to a specific size (Φ3.5mm) with section-area reductions of about 60% for wire WA and 70% for wire WB, respectively
Four factors affect the quality of spheroidized annealing such as spheroidized annealing temperature, prolonged heating time, furnace cooling time and flow rate of nitrogen
Summary
The manufacturing processes of fasteners generally include wire-manufacturing, forming, heat treating, coating. A cold-heading-quality alloy steel rod is used to manufacture wire for cold heading. The wire that is spheroidizing-annealed-in-process is produced by drawing wire coil into wire, followed by heat treatment, cleaning and coating, and a final drawing operation for cold forming. A cold heading quality AISI 1022 steel wire is widely used to manufacture self-drilling screw and tapping screw. For wire-manufacturers, some companies purchase steel wires, cold reduce, and spheroidize them before selling to bolt manufacturers; some companies are bolt manufacturers who spheroidize the wires themselves before cold heading. Most companies were using a subcritical process by prolonged holding at a temperature just below Ae1 [1]
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