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我厂接受了援外工程设备特大轴承中3米内齿圈的加工任务。该齿圈外径φ2996毫米,内径φ2592毫米,宽度270毫米,材料是5CrMnMo合金钢,热处理硬度HB230～270,模数M16,齿数164,精度9Dc,原安排在5米滚齿机用内铣头圆片铣刀,单分齿加工,分三次铣削完成,估计一个月可加工好一件。但由于采用附加内铣头,大大降低机床刚性,不能采用较大的切削用量,生产效率很低,实际加工一件需3个多月,5件要到75年3季度才能完成,这不仅严重影响援外任务的完成,还由于长期占用5米滚齿机这台关键设备,影响其他产品任务的完成。
Our factory has accepted the processing task of the 3-meter ring gear in the large bearing of foreign aid engineering equipment. The ring outside diameter φ2996 mm, inner diameter φ2592 mm, width 270 mm, the material is 5CrMnMo alloy steel, heat treatment hardness HB230 ~ 270, modulus M16, the number of teeth 164, the accuracy of 9Dc, Milling cutter, a single tooth processing, milling three times in a single month is estimated to be able to process a good one. However, due to the use of additional milling head, greatly reducing machine rigidity, can not use a large amount of cutting, the production efficiency is very low, the actual processing of a need more than three months, five to 75 in the third quarter to complete, not only serious Affect the completion of foreign aid mission, but also due to the long-term occupation of 5 meters hobbing machine this key equipment, affecting the completion of other product tasks.