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国外来料加工,我们承担了一项波音737飞机零件的机械加工任务,该零件毛坯为356—T6(美国牌号)铝合金铸件,需要加工一个通孔,孔的直径为φ31.827~(+0·05)毫米,孔长为52毫米,粗糙度要求,相当于我国的6级。我们的加工方法是:钻孔后扩孔至φ31.3毫米,然后用我厂设计制造的一组(三把)专用铰刀铰至最后尺寸。使用并装铰模装夹工件和引导刀具,开始我们使用的机床为苏联59年生产的2A53摇臂钻床(该机床已用了二十余年),铰出的孔粗糙度只有4级,为了提高铰孔粗糙度,于是将冷却润滑液由乳化液改为豆油,又多次改变切削速度(V)和走刀量(S),然而铰孔粗糙度却仍然停留在4级,严重地威胁着国外订货任务的完成。恰在这时我们新购的一台升降台立式铣镗床(X5430B)安装完毕。于是我们改用该铣镗床加工。钻模、刀具和冷却润滑液(乳化液)不变,切削速度(V)和走刀量(S)也基本相同,然而铰孔粗糙度竟稳定地超过了6级,顺利地完成了生产任务。
Foreign processing, we assume a Boeing 737 aircraft parts machining tasks, the spare parts for the 356-T6 (US grade) aluminum alloy castings, the need to process a through hole diameter of φ31.827 ~ (+ 0 · 05) mm, hole length of 52 mm, roughness requirements, equivalent to China’s 6. Our processing method is: reaming hole to φ31.3 mm after drilling, and then use a group of factory designed and manufactured (three) dedicated reamer hinge to the final size. The tool used to assemble and guide the tooling with a hinged mold was used to start the machine we used for the 59 years of the Soviet Union 2A53 radial drilling machine (the machine has been used for more than 20 years), the hinge hole roughness of only 4, Increasing the reaming roughness, so the cooling liquid from the emulsion to soybean oil, and then change the cutting speed (V) and the amount of walking (S), however, reaming roughness still remain at level 4, a serious threat Completion of the task of ordering abroad. Just at this time we purchased a new Taiwan vertical milling and boring machine (X5430B) is installed. So we use the milling boring machine processing. The cutting speed (V) and the cutting speed (S) are basically the same for the die, the tool and the cooling lubricant (emulsion), however, the reaming roughness has steadily exceeded the level 6 and the production task has been successfully completed .