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我厂所有2、4类轴承(特大型轴承除外)的铜保持架的铆钉孔加工,均用φ2～5mm钻头在Z512机床上直接钻孔。 以前,用20＃机油润滑冷却,但加工时,冷却性能仍不理想,钻头易发烫,使铜保持架铆钉孔的精度受到影响。而且,由于钻头发烫,钻头上的机油一部分以油烟形式带走,另一部分却牢牢地粘在铆钉孔周围。虽经表面脱脂处理,但仍不能彻底除掉。用长时间脱脂,其粘附的油污虽能除去,但基体的颜色却受到严重影响。为了保证表面处理后的质量,我们曾改用表面处理前汽油清洗,但工人的劳动强度增加,同时还花费了不少汽油。
All 2,4 bearing bearings (except for large bearings) copper cage rivet hole processing, are used φ2 ~ 5mm drill in the Z512 machine direct drilling. In the past, with 20 # oil lubrication cooling, but the processing, the cooling performance is still not ideal, the drill easy to hot, so that the accuracy of copper cage rivet holes affected. Moreover, due to the bit is hot, part of the oil on the drill bit is taken away in fume form, while the other part is firmly stuck around the rivet hole. Although the surface degreasing, but still can not be completely removed. With a long time degreasing, although the adhesion of oil can be removed, but the color of the substrate has been seriously affected. In order to ensure the quality of the surface treatment, we have switched to the use of gasoline before surface treatment, but the labor intensity of the workers has increased, at the same time, it has also spent a lot of gasoline.