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我厂在加工矿山设备时,碰到一批A3钢和45钢调质的工件,需用丝锥加工G3/4in和M30×2的盲孔螺纹各2只,用20号机械油和合成锭子油润滑、冷却攻丝,由于“烂牙”造成废品率达10～15％左右,丝锥损耗也大。用植物油(菜油)及二硫化钼润滑、冷却,效果也不理想。后改用3~#钙基润滑脂(黄油)涂丝锥攻丝,近二年来,加工一百余件,未发生“烂牙”现象。据我们分析,丝锥切削点的最高温度约220°～250℃,而20号机械油或
I plant in the processing of mining equipment, met a batch of A3 steel and 45 steel quenched and tempered workpiece, the need to tap processing G3 / 4in and M30 × 2 of the blind hole thread two, with 20 and synthetic spindle oil Lubrication, cooling tapping, due to “rotten teeth” resulting in rejection rate of 10 to 15%, tap loss is also large. With vegetable oil (vegetable oil) and molybdenum disulfide lubrication, cooling, the effect is not satisfactory. After the switch to 3 ~ # calcium-based grease (butter) tap tapping, the past two years, processing more than 100 pieces, did not happen “rotten teeth” phenomenon. According to our analysis, the maximum temperature of the tap cutting point is about 220 ° ~ 250 ° C while the No. 20 machine oil or