Experiment shows that stress relief anneal will not decrease the tool life of ground end mills and the hardness is not the main factor with influence the tool life within the hardness range HRC63～66 designe
试验表明，去应力退火不降低磨制立铣刀切削寿命，在设计要求硬度ＨＲＣ６３～６６范围内，硬度不是影响立铣刀切削寿命的主要因素。
