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我厂一台卧式组合机床用于铸铝件的深孔钻削和钻扩铰(图1),钻φ8.5×90深孔时为防止钻头过热粘刀,选用的是冷却性极好的水质切削液。在钻扩φ9.8和φ14孔时,采用碳素工具钢制造的浮动刀杆和固定式导向套保证产品位置精度(图2)。实践证明,刀杆与导向套的配合间隙宜在0.01～0.02mm内。 试加工发现,导向套与刀杆常发生相互咬死的“烧套”现象。为解决“烧套”现象,曾用加大刀杆浮动量改善浮动性,加大刀杆上的油槽,加大切削液流量,增大刀杆与导向套的硬度差等办法,效果都不理想,不能杜绝“烧套”现象。 究其原因,是因长时间工作产生的摩擦热或环境温度升高而导致的热膨胀,使得刀杆与导向套之间本来就较小的配合间隙变得更小,水质切削液冷却性虽好,但润滑性欠佳,使刀杆与导向套光滑的配合表面之
I plant a horizontal combination of machine tools for casting of aluminum parts of the deep hole drilling and drilling expansion hinge (Figure 1), drill φ8.5 × 90 deep hole to prevent overheating sticky knife, the choice of excellent cooling Water quality cutting fluid. In drilling φ9.8 and φ14 holes, using carbon tool steel floating arbor and fixed guide sleeve to ensure product positioning accuracy (Figure 2). Practice has proved that the gap between the cutter bar and the guide sleeve should be within 0.01 ~ 0.02mm. Trial processing found that the guide sleeve and arbor often bite each other “burn” phenomenon. In order to solve the “burn-in” phenomenon, it has been used to increase the floating amount of the arbor to improve the floatability, increase the oil groove on the cutter bar, increase the flow rate of the cutting fluid, increase the hardness difference between the cutter bar and the guide sleeve, and the effects are unsatisfactory. Put an end to “burn” phenomenon. The reason is due to friction heat generated by prolonged work or environmental temperature caused by thermal expansion, making the cutter bar and the guide sleeve has been smaller with the smaller gap between the original, although the cooling water cooling quality is good , But poor lubricity, the cutter bar and the guide sleeve with a smooth surface