论文部分内容阅读
泥浆泵中皮带轮铸件是重要关键件之一,质量要求高,加工面不允许有铸造缺陷存在。铸件材质HT20—40,重量136kg。车间原工艺方案如图1,浇注系统采用开放式内浇口、闸门式横浇口,F_内:F_横:F_直=1:1.34:1,内浇口为扁形8×32mm,横浇口34(38)×40mm,直浇口φ30mm,采用锯齿形闸门横浇口进行挡渣。但自1968～1972年统计,废品率占20％左右,其中气孔废品占80％以上,其余为冷融、起皮等。
Mud pump pulley casting is one of the key components, high quality requirements, the casting surface does not allow casting defects exist. Casting material HT20-40, weight 136kg. The original process plan of the workshop is shown in Fig.1. The pouring system adopts an open inner gate and gate type horizontal gate. F_: horizontal: F_ straight = 1: 1.34: 1, the inner gate is flat 8 × 32mm, Horizontal gate 34 (38) × 40mm, sprue φ30mm, the use of zigzag gate gate to stop slag. However, statistics from 1968 to 1972, the rejection rate of about 20%, of which stomatal waste accounted for more than 80%, the rest of the cold-melting, peeling and so on.