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一、前言 热处理采用保护气体,可避免零件表面氧化、脱碳,且保持光洁。从而确保零件具有所需要的表面性能,特别是抗疲劳性能,同时可减少热处理后的研磨加工量。在国外早已广泛采用,但在我国还仅仅是开始,没有定型的设备,工艺也在摸索中。 轴承零件在空气电炉中淬火加热,发现有较严重的氧化、脱碳,据洛阳轴承厂中央试验室检验统计:脱碳深度:箱式电炉为0.08～0.14毫米,严重的达到0.25毫米;输送带式电炉为0.10～0.14毫米,严重的达到0.30毫米;鼓型电炉为0.10～0.14毫米,严重的达到0.20毫米,且形成很厚的氧化皮。大大地影响了零件的表面质量,甚至因此而报废。为清除氧化皮和脱碳层,研磨加工量很大。不但浪费了材料、加工费用和劳动工时,而且严重地影响了产品外观与工作性能,使轴承过早地损坏。为解决此问题,决定选用外热式木炭保护气体进行试验。试验
First, the introduction of heat treatment using protective gas, parts can be avoided oxidation, decarburization, and keep clean. This ensures that the part has the required surface properties, especially fatigue resistance, while reducing the amount of grinding after heat treatment. In foreign countries already widely used, but in our country is still only the beginning, there is no stereotyped equipment, technology is also groping. Bearing parts in the air furnace quenching and heating, found to have more serious oxidation, decarburization, according to Luoyang Bearing Factory Central Laboratory test statistics: Depth of decarburization: box furnace 0.08 ~ 0.14 mm, a serious 0.25 mm; conveyor belt The electric furnace ranged from 0.10 to 0.14 mm, reaching a severity of 0.30 mm; the drum-type electric furnace ranged from 0.10 to 0.14 mm, reaching a severe 0.20 mm and formed a very thick scale. Greatly affected the surface quality of parts, and even scrapped. In order to remove the scale and decarburized layer, a large amount of grinding processing. Not only waste materials, processing costs and labor hours, but also seriously affected the appearance and performance of the product, the bearing premature damage. In order to solve this problem, we decided to use external thermal charcoal shielding gas for testing. test