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在一般小巧的冷热模具制造中,由于热处理、模具材料等原因,常会出现硬点(一般在HRC 60以上),使锉刀无法加工。遇到以上情况时,可用滴硫酸的方法解决。具体做法,可先取一玻璃滴管(其它非金属容器也可),吸一点硫酸,硫酸的浓度视加量而定,大或硬则浓,反之则应淡一些。使用前先滴几点在待锉削表面上,经数分钟后,用碱水棉球将其擦净便可进行锉削、砂光。
In the general small hot and cold mold manufacturing, due to heat treatment, mold materials and other reasons, often appear hard point (usually above HRC 60), the file can not be processed. In the event of the above situation, the solution can be used sulfuric acid solution. Specific approach, you can take a glass dropper (other non-metallic containers can be), suck a little sulfuric acid, sulfuric acid concentration depending on the amount of the increase, large or hard is concentrated, otherwise it should be lighter. A few minutes before use, the surface to be filing, after a few minutes, with alkaline cotton wipe it can be filleted, sanding.