Surface treatment method for bearing cast iron blank

The invention discloses a surface treatment method of a bearing cast iron blank, which comprises the following steps: step 1, placing the bearing cast iron blank under the condition that the temperature is 700-800 DEG C, preserving heat for 2-5 hours, and carrying out decarburization treatment on the surface of the bearing cast iron blank; secondly, the bearing cast iron blank obtained after decarburization treatment is subjected to shot peening strengthening; and thirdly, alkali washing oil removal and acid washing rust removal are conducted, and the bearing cast iron blank surface meeting the white alloy casting requirement is obtained. Graphite on the surface of the bearing cast iron blank can be effectively removed, and the bonding strength of subsequent cast iron matrix casting white alloy is improved. 本发明公开了一种轴承铸铁毛坯的表面处理方法，其包括如下步骤：步骤一，将轴承铸铁毛坯置于温度为700~800℃的条件下保温2~5h，对轴承铸铁毛坯表面进行脱碳处理；步骤二，将脱碳处理后的轴承铸铁毛坯进行喷丸强化；步骤三，进行碱洗除油、酸洗除锈，得到满足白合金浇铸要求的轴承铸铁毛坯表面。其能够有效去除轴承铸铁毛坯表面的石墨，提高后续铸铁基体浇铸白合金的结合强度。