树脂砂型(芯)裂纹的产生机理和控制措施

Mechanism of Crack on Resin Sand Core/Mold and Prevention Methods

树脂砂型(芯)表面使用醇基涂料,点燃后常常会产生裂纹,影响型(芯)质量。浇注金属液后常因为砂型(芯)的开裂导致铸件出现脉纹和毛刺缺陷,影响铸件的质量。树脂砂型(芯)在浇注前和浇注后开裂的根本原因在于型(芯)砂受热后的膨胀。避免涂料点燃后型(芯)裂纹的产生,要防止涂料燃烧过程中对型(芯)的加热,减少型(芯)在铁液浇注后的开裂措施,可以避免型(芯)在受热后膨胀过程中产生压应力。

Resin sand mould(core)surface using alcohol based coating,after ignition often crack,it affected the quality of the sand core/mould.Veins and burr defects often occur in casting due to sand mold(core)cracking after pouring metal liquid,which affected the quality of casting.The root cause of the cracking of resin sand mould(core)before and after pouring is the expansion of sand mould(core)after being heated.To avoid the paint after ignition(core)crack generation,to prevent the paint in the combustion process of the type(core)heating,reduce the type(core)in the iron liquid pouring cracking measures,it can avoid the type(core)in the process of expansion after heating compressive stress.