METHOD FOR ADJUSTING MOISTURE OF MOLDING SAND

摘要

PURPOSE:To adjust moisture to a target value with good accuracy by correcting automatically the preset amt. of the sand to be processed in a sand mill. CONSTITUTION:The moisture value and temp. before and after mixing of molding sand are measured at prescribed time intervals which are preliminarily set. The average values of the measured values are determined for every plural pieces which are preliminarily set time-serially. The required amt. of the water to be added for the target moisture value is determined from such average values and the preset amt. of the sand to be processed. The amt. determined in such a way is fed to a sand mill, by which the moisture of the molding sand is adjusted. The preset amt. of the molding sand to be processed is corrected by a computer in this case according to the difference between the target moisture value and the moisture value after mixing.