Method for reducing surface oxidation rate of hard alloy

The invention belongs to the technical field of hard alloy deep processing, and particularly relates to a method for reducing the surface oxidation rate of hard alloy. The cutting fluid is used for rough grinding and accurate grinding of hard alloy, appearance defects of the alloy caused by cobalt loss due to surface local oxidation can be reduced, and after rough grinding and accurate grinding, the product is protected by the soaking protection fluid, so that appearance defects caused by oxidation after air contact due to the fact that the surface of the processed product still has high temperature can be effectively avoided; by adopting the process disclosed by the invention, the appearance oxidation rate of the alloy after finish machining can be controlled below 0.2%. 本发明属于硬质合金深加工技术领域，具体涉及一种降低硬质合金表面氧化率的方法，采用磨削液和/或抗氧化剂配置形成切削液和浸泡保护液，切削液用于硬质合金的粗磨和精磨可降低因表面局部氧化造成的钴流失导致合金产生的外观缺陷，且粗磨和精磨后，产品均采用浸泡保护液保护，可有效避免因加工后产品表面仍有较高温度而导致空气接触后发生氧化产生外观缺陷；采用本发明所述工艺，精加工后合金外观氧化率可控制在0.2％以下。