Casting Method and Process Improvement of Gray Iron Machine Tool Base
The structure and technical requirements of the gray iron machine tool base were introduced,original casting method and process,and caused shrinkage cavity and porosities as well as the deformation defects were described in details.Through increasing spherical riser dimensions,setting chills to chill hot spots to earlier solidify and thereby to realize earlier solidification.Through increasing steel scrap adding ratio,increasing the control median of manganese content,decreasing carbon content and silicon content to ensure pearlite volume fraction and thereby ensure casting hardness.Through adding strengthening ribs to prevent casting contraction deformation.Production results showed:continuously producing 10-piece machine tool base castings having not defect on top surface,not shrinkage cavity and porosities,the deformation was controlled less than 2 mm.Improving effect was obvious.
万方数据
维普
