我厂在制造750公斤空气锤时,有一材料力45号钢的锤杆(图1),其中 300×1075公厘的深孔无法锻出,必须采用机械加工来达到。当时我们考虑了三个方案:1)用车刀车出。2)采用大型深孔套料刀套出,再在该孔末端开一孔;用气割切断其连接部分,最后把孔堵死。3)苏联专家布诺夫同志建议用深 I plant in the manufacture of 750 kg air hammer, there is a material force 45 steel hammer (Figure 1), of which 300 × 1075 mm deep hole can not be forged out, you must use mechanical processing to achieve. At that time we considered three options: 1) car out with a lathe. 2) The use of large deep-hole sets of nesting knife sets out, and then at the end of the hole to open a hole; cut with gas cutting connection, and finally blocked the hole. 3) Comrade Bulov, a Soviet expert, suggested using deep