我厂先进车工朱大仙同志,在技木革新运动中,刻苦钻研,虚心地学习各种先进经验,从而改进了一把加工铸铁用的高速切削车刀。用这把车刀加工铸铁工件,切削速度高达每分钟810米,创造了我厂加工铸铁的最高记录,为铸铁的高速切削开辟了途径。我们知道,切削铸铁工件,通常是以增加切削深度和走刀量来提高生产效率的,而很少采用高速切削。这是因为铸铁表面的硬度较高,而且不太平整;切削时,冲击力很大,刀具容易损坏,因而很难提高切削速度。在精车 Comrade Zhu Da Xian, an advanced mechanic in our factory, studied assiduously with all kinds of advanced experience in the technological innovation movement, thus improving a high-speed cutting turning tool for processing cast iron. With this lathe machining cast iron parts, cutting speed up to 810 meters per minute, I created the highest record of processing cast iron plant, opened the way for high-speed cutting of cast iron. We know that cutting cast iron workpieces often increases productivity by increasing depth of cut and tooling, and rarely uses high-speed cutting. This is because the cast iron surface hardness is high, and not very smooth; cutting, the impact of large, easy to damage the tool, it is difficult to improve the cutting speed. In fine car