为了提高钢粒钻头的质量和解决钻头料的货源问题,我们从1973年开始,学习制造铸钢钢粒钻头,一年多来,已陆续制出φ110及φ91毫米的铸钢钻头三百多个,都已投入生产使用.为了对比普通轧制的钢粒钻头同自制铸钢钻头的使用效果,我们随意各抽了五个钻头在同一层位和同等工艺条件下,进行了生产测定,实测结果列于表1.钻进条件:主要设备为北京600型转盘钻机,配用BW200/40往复式泥浆泵;井深为 In order to improve the quality of drill bit and to solve the problem of the supply of drill bit material, we started to study and manufacture cast steel drill bits in 1973. Over the past year, we have successively produced more than 300 cast steel drill bits of φ110 and φ91 mm , Have been put into production use.In order to compare the ordinary rolling of steel bits with the use of cast steel drill bits, we randomly pumping five drill bit in the same level and the same process conditions, the determination of the production, the measured results Listed in Table 1. Drilling conditions: The main equipment for the Beijing 600 turntable rig, equipped with BW200 / 40 reciprocating mud pump; well depth