对于形状复杂的油砂芯、合脂砂芯等,生产上多用蜡线法排气,这里再介绍两种方法,以供选用。1.制造如图所示的气眼针。扎气眼时,持手柄使针头沿K向从芯头端部(必要时可从砂芯的任何部位)进入砂芯,并注意使压块轻压在砂芯表面上,沿K向移动手柄,针头在 For the complex shape of the oil sand core, synthetic sand core, etc., the production of wax exhaust method, here again introduced two methods for selection. 1. Make the eye needle as shown When the gas is being blinded, the handle holds the needle in the K-direction from the end of the core head (from any part of the sand core, if necessary) into the sand core, with care being taken that the compact is gently pressed against the surface of the sand core and the handle is moved in K Needle in