将工件冷却至-20～-150℃左右进行切削加工称之为冷冻切削,又称为低温加工。钢的低温脆性如图1所示,软钢在-100℃时其冲击值接近于零。试验证明:在低温下用车床切削软钢要比在常温下容易得多,常温下连在一起的带状切削,在低温下断成了碎屑(图2)。这样,对铁屑的处理就容易了,同时刀具的寿命提高,钢的复原性好,即钢件经过低温加工后,回到室温时,能够继续保持原有钢件的使用性能。 The workpiece is cooled to -20 ~ -150 ℃ for machining called frozen cutting, also known as low-temperature processing. Low temperature brittleness shown in Figure 1, soft steel at -100 ℃ when the impact value close to zero. Experiments show that: at low temperatures with the lathe cutting mild steel than at room temperature is much easier, at room temperature, together with ribbon cutting, broken into pieces at low temperatures (Figure 2). In this way, the treatment of scrap iron is easy, while tool life increases, steel recovery is good, that steel after low temperature processing, back to room temperature, can continue to maintain the original steel performance.