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在我厂的生产过程中,曾经有过不少经验教训。1965年间生产C6016型、6～8m~3自行式铲运机,其终传动轴大端接盘直径φ400,轴径φ140d4,φ130g6,材质45钢,因为正火处理不良,在加工后从机床往下吊放下时,在φ140d4处齐口断裂;1978年在生产TL180轮胎推土机中,其变矩器外壳,常因铸件壁薄结构不对称,形状复杂,在加工过程中变形较大,尺寸精度不稳定,并随气温的变化而变化,甚至同一工件日夜两次测量就相差0.05～0.12mm.曾单纯从零件结构上考虑,解决不了问题。后来对加工全过程调查研究后,发现退火处理炉温度不够高,而且不均匀,修了炉子保证了温度后,工件加工精度也提高了,但有时还不稳定,说明加工过程中也会产生内应力,粗加工后破坏了内应力平衡,所以还得消除内应力。消除内
In our factory production process, there have been many experiences and lessons. 1965 C6016-type production, 6 ~ 8m ~ 3 self-propelled scraper, the final drive shaft large end dish diameter φ400, shaft diameter φ140d4, φ130g6, 45 steel material, because normalizing poor, after processing from the machine down When hanging down, φ140d4 at Qi mouth fracture; in the production of TL180 tire bulldozer in 1978, the torque converter shell, often due to the thin wall structure of the casting asymmetric, complex shape, large deformation in the process, the dimensional accuracy of instability , And changes with the temperature changes, and even the same piece of the difference between the two measurements on a day and night 0.05 ~ 0.12mm. Had simply considered from the structural parts, can not solve the problem. Later on the whole process of processing and research and found that annealing furnace temperature is not high enough, and uneven, repair the furnace to ensure the temperature, the workpiece processing accuracy is also increased, but sometimes not stable, that process will produce internal stress , After roughing destroyed the balance of internal stress, so have to eliminate internal stress. Eliminate