过去我们在湿型合箱前,要撒复料。这不仅浪费时间,而且也恶化了劳动条件。现在将作复料的黑石墨粉直接加到面砂里,在造型后即合箱浇注,其效果仍很理想。不仅清砂方便了,而且铸件表面光滑,粘砂、气孔等缺陷也减少了。 In the past, we were going to dispense materials before we got the wet closures. This not only wasting time, but also aggravating working conditions. The black graphite powder, which will be re-materialized, will now be added directly to the surface sand, which will be put into the box after molding, and the effect is still very satisfactory. Not only easy to clean sand, but also smooth casting surface, sticky sand, porosity and other defects are also reduced.