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我厂生产的某产品的接触器触头选用材料为T2紫铜,生产工艺:首先将φ30mm的棒料锻造成触头毛坯。加热温度为920℃,保温30分钟。一次在坯料出炉时发现有20件鼓泡,镦锻时在鼓泡处皱凸开裂,后另选一根棒材仍按上述工艺规范进行,出炉和镦锻时都未发现鼓泡和开裂。上述锻件材料分别是由两个单位分4批供货,进厂后炉号已混,其化学成分也未复验,为了寻找鼓泡原因,我们用上述尚未加热的混号材料进行了试验。
I plant production of a product contactors selected materials for the T2 copper, production technology: First φ30mm bar forging into the contact blank. Heating temperature is 920 ℃, heat for 30 minutes. Once found in the billets 20 bubbling upsetting ruffled at the bubbling rupture, after another bar is still selected according to the above process specifications, baked and upsetting were not found bubbling and cracking. The forging materials were supplied by two units in four batches. After entering the factory, the furnace number was mixed and its chemical composition was not re-tested. In order to find out the reason for the bubbling, we conducted the test with the above unheated mixed-material.