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发黑处理工艺简介
发布者:admin  发布时间:2016-12-27 14:44:56  点击:3354

本文由无锡志丰工程机械设备厂提供,更多电缆输送机发黑处理 资讯请访问:www.wxzfgc.com

    发黑处理是一种轴承套圈倒角及挡边的发蓝防锈处理工艺。轴承套圈在热处理后经过除油脱脂,然后在氢氧化钠、亚硝酸钠、硝酸钠和水的混合溶液中进行变色处理,其配比为2-3∶1,其余加水;加水量以温度在 135℃-145℃为合适;时间15-25分钟;取出套圈用清水冲洗后进行钝化处理,钝化处理用重铬酸钾溶液作为填充液,其浓度为12%-18%;在室温下 1-2分钟;经钝化处理并干燥后,放入105℃-120℃的机油或防锈油中 1-3分钟,至气泡完全消失后取出,停放10-15分钟后检验。本发明生成的氧化物薄膜性能稳定,在常温下可长期保护套圈倒角、挡边处不生锈,轴承的外观质量得到明显改善。发黑处理工艺具有以下效果:

(1)发黑安全不用电,用碱性高温发黑需100%用电。
(2)提高工效:共需1-2小时。
(3)发黑成本低,设备简单,操作方便;对发黑时间作了严格的控制。
(4)工艺适应性强:解决了球墨铸铁不能发黑的难题。

 

 Is a kind of bearing ring chamfer and bluing antirust processing technology of the guard.Bearing ring after oil removal after heat treatment, and then in a mixture of sodium hydroxide, sodium nitrite and sodium nitrate and water color processing in the solution, the ratio of 2-3:1, the rest of the water.Add water to the temperature at 135 ℃ to 145 ℃ for appropriate;15 to 25 minutes;Take out the ring after wash passivation treatment, passivation treatment with potassium dichromate solution for filling liquid, the concentration of 12% to 12%;1 to 2 minutes at room temperature;After passivation treatment and drying oil is put in the 105 ℃ to 120 ℃ or rust-proof oil 1-3 minutes, to take out after bubble disappear entirely, park 10 to 15 minutes after the inspection.This invention generated oxide film performance is stable, at room temperature can be long-term protection ring chamfer, guard not rusting, the appearance of the bearing quality is obviously improved.Black finish process has the following effects:(1) black security is not electricity, use high temperature alkaline black 100% utilization.(2) improve the working efficiency, need 1 to 2 hours.(3) black low cost, simple equipment, easy to operate;Make the strict control on black time.(4) the process adaptability is strong, solved the difficult problem of nodular cast iron can not black.

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