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对直径小且细长(L/d>25)易变形的各种高速钢刀具,我厂过去采用二次分级冷却淬火工艺,弯曲变形大,校直工时多,废次品率高。为提高刀具质量,自1979年起对φ10×310mm的W18Cr4V钢铣制直柄钻头以及φ14×280mm的深孔铰刀等工具,采用了贝氏体等温处理工艺,效果显著。基本满足了对弯曲变形和性能的要求。 1.原用热处理工艺:以前采用二次分级淬火工艺(400℃×4min,280～300℃×15～20min)。淬火后弯曲超差达70%,热校劳动强度大,校直稳定性差;回火(560℃×90mn×3次)后再度弯曲数量多,废次品率平均8～10%,使用过程中易发生断裂和崩
On the small diameter and slender (L / d> 25) easy to deform a variety of high-speed steel cutting tools, I used to plant the second grading cooling quenching process, large bending deformation, straightening hours, waste defective rate. In order to improve the quality of the tool, the billet isothermal treatment process has been applied to the tools such as the straight shank drills made of φ10 × 310mm W18Cr4V steel and the deep-hole reamers of φ14 × 280mm since 1979, and the effect is remarkable. Basically meet the bending deformation and performance requirements. 1. The original heat treatment process: before the use of secondary classification quenching process (400 ℃ × 4min, 280 ~ 300 ℃ × 15 ~ 20min). After quenching, the bending tolerance is up to 70%, and the labor intensity in the thermal school is large, and the straightening stability is poor. After the tempering (560 ° C × 90mn × 3 times), the number of bending is more and the percentage of defective rejects is on average 8 to 10% Easy to break and collapse