Partial Hardening of SK5 Tool Steel Saw Teeth by Induction Heat Treatment
|關鍵字:||高週波感應加熱;SK5工具鋼;局部硬化;High frequency induction heating;SK5 tool steel;Partial hardening|
Tool steels usually are used in a variety of cutting tools and hand tools, because they are easy to process, can achieve high hardness and have good wear resistance. However, tool steels have some drawbacks, such as low hardenability and temper softening. Tool steels must impose the appropriate heat treatment to improve the mechanical properties. The material of this study is JIS SK5 tool steel often used in Japanese woodworking handsaw blade. High frequency induction heating could heat a specific part of workpiece. To make use of this characteristic together with subsequent heat treatment, we hope to make an ideal saw tooth which have high hardness on the cutting edges and good wear resistance. However, if the saw don’t have appropriate toughness in the saw body, it will shorten the life of saw blade. The heat treatments in this study were high-frequency induction heating and air quenching, low temperature tempering after high-frequency induction heating and air quenching, double quenching after high-frequency induction heating and air quenching, and low temperature tempering after double quenching. To evaluate the effect of heat treatments we measured the hardness distribution on the saw teeth, examine the micro-structures of the teeth and wear testing. The results showed that the saw teeth treated with high-frequency air quenching and tempering for 30 minutes at 150℃had higher hardness on the cutting edges and better wear performance. On the other hand, the saw teeth rupture and shortening the life of the saw blade were caused by hard teeth tip without soft body texture to absorb the cutting force.
|Appears in Collections:||Thesis|
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