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本生产性试验的目的,是研究齿轮锻坯酸洗后凹槽还残存的氧化皮对气体渗碳的影响。试验结果表明:气体渗碳炉中有了氧化皮,对炉子气氛影响很大;炉中CO_2％大大地超过了正常的CO_2％。通过试验,研究带有氧化皮齿轮的气体渗碳的一般规律,采取了相应措施,从而保证了此类齿轮的渗碳质量。同时对氧化皮影响气体渗碳进行了计算与分析,提出了在炉子中加入焦碳有可能使炉中的CO_2％较快地降低到正常的CO_2％量。试验表明:高温下加入焦碳后,确有强化渗碳气氛和加快渗碳速度等效果。通过本试验进一步推论渗碳炉马弗罐的“老化”主要是“氧化”的问题,采取了除去马弗灌壁上的氧化皮等措施后,使曾“报废”了的马弗罐重新投入生产。
The purpose of this productive test is to study the effect of the oxide scale remaining on the groove after carburizing the gear forging on the carburization of the gas. The experimental results show that there is oxide scale in the gas carburizing furnace, which has a great influence on the furnace atmosphere. The CO 2% in the furnace greatly exceeds the normal CO 2%. Through the experiment, the general law of gas carburizing with scale gear was studied and corresponding measures were taken to ensure the quality of carburizing of such gear. At the same time, the influence of scale on gas carburizing was calculated and analyzed, and it was proposed that the addition of coke in the furnace could cause the CO 2% in the furnace to decrease rapidly to the normal amount of CO 2%. Tests show that: After adding coke under high temperature, does have the effect of strengthening carburizing atmosphere and speeding up carburizing speed. Through this test to further infer the carburizing furnace muffle “aging” is the main “oxidation” problem, taken to remove muffle irrigation scale and other measures, the once “muffled” muffle re-enter produce.