发动机上有許多带內孔的零件,一般內孔的精度和光洁度要求都較高,在大量生产的情况下,大都采用拉削的加工方法来保証。大家都知道,拉刀的制造比較复杂,周期长,使用寿命較短。每只拉刀只能加工近万只零件,光洁度只有▽▽5。毛主席教导我們:“人类总得不断地总结经验,有所发现,有所发明,有所创造,有所前进。” There are many engine parts with holes, the general requirements of precision and finish the hole are higher, in the case of mass production, most of the use of broaching processing methods to ensure. We all know that the manufacture of broaches more complex, long cycle, shorter life expectancy. Each broach can only process nearly 10,000 parts, finish only ▽ ▽ 5. Chairman Mao taught us: “Mankind always has to sum up his experience, discover something, invent something, create something, and make progress.”