The invention discloses a high nickel austenitic nodular cast iron engine exhaust pipe back fire technology, belonging to the automobile parts production technology field, including casting technology and casting mould, the casting mould includes sand mould, sand core and casting system, the casting system includes straight runner, cross runner located at the lower part of the straight runner, and inner runner located at both sides of the horizontal runner. The end of the inner runner is connected with the fire inlet with a slag ladle, and the exhaust pipe body is provided with an insulating riser in the middle of the air inlet flange surface. The invention takes fire from the back of the casting and discharges the cavity gas from the riser of the intake flange to ensure that the molten iron does not wrap the isolated air bag during the pouring process; the front end of the intake port of the casting is designed with a slag ladle, on the one hand, the impact of molten iron on the cavity is reduced, the molten iron enters the cavity smoothly, and other casting defects such as inclusion slurry are avoided; at the same time, the problems of scaling, porosity and shrinkage of the casting are solved. It is also suitable for casting triethylamine cold core.
【技术实现步骤摘要】
一种高镍奥氏体球墨铸铁发动机排气管背部进火工艺
本专利技术涉及汽车零部件生产
,具体涉及一种高镍奥氏体球墨铸铁发动机排气管背部进火工艺。
技术介绍
高镍奥氏体球墨铸铁发动机排气管,在中高档轿车发动机中有着广泛的应用。砂型铸造是大批量生产高镍球铁铸件的基本工艺。三乙胺法冷芯盒制芯,具有高效节能,铸件表面质量好,尺寸精度高,砂芯溃散好等优点,适用于砂型铸造大批量生产。高镍球铁,有钢液流动性差,凝固收缩大,浇注温度高等工艺特点。铸件缩松倾向大,表面易夹杂、起皮。同时排气管结构复杂,形状不规则,流道精密度高,壁厚较薄,铸造工艺难度大。在实际铸造生产应用中,由于覆膜砂乏气量大,浇注系统设计不合理等原因,起皮问题时有发生、铸件气孔、缩松缺陷比例很大,制约着产品的生产。特别是在大批量生产使用三乙胺冷芯时,起皮呛火格外严重,铸件废品率极高。为了提高铸件成品率,提高生产效率,需要从浇注系统上着手,寻求一种理想的解决方案。公开号为CN201410432490.2的专利文献公开了轻型车排气管浇注工艺,其特征在于包括以下工艺过程:将浇口的位置从边侧移到排气管中间的管口部位,使铁水从两个管口注入型腔,从而型腔内的气体在上升铁水推动下,分别由两处浇注通道排出,与此同时又及时的调整了芯头的间隙。但是该浇注工艺中,型腔内的气体从浇注通道内排出,铸件起皮呛火现象严重,气孔、缩松等缺陷多,成品合格率低。公告号为CN205904387U的专利公开了一种高镍球铁排气管浇注系统,包括直浇道、设置在所述直浇道下部两侧的横浇道、设置在所述横浇道两侧的内浇道;所述内浇道末端连接补缩冒口,所述补缩冒 ...
【技术保护点】
1.一种高镍奥氏体球墨铸铁发动机排气管背部进火工艺,包括铸造工艺和铸造模具,所述铸造模具包括砂型、砂芯和浇注系统,其特征在于:所述浇注系统包括直浇道、设置在所述直浇道下部的横浇道、设置在所述横浇道两侧的内浇道;所述内浇道的末端与设有积渣包的进火口相连接,所述排气管本体在进气法兰面中部设置保温冒口。
【技术特征摘要】
1.一种高镍奥氏体球墨铸铁发动机排气管背部进火工艺,包括铸造工艺和铸造模具,所述铸造模具包括砂型、砂芯和浇注系统,其特征在于:所述浇注系统包括直浇道、设置在所述直浇道下部的横浇道、设置在所述横浇道两侧的内浇道;所述内浇道的末端与设有积渣包的进火口相连接,所述排气管本体在进气法兰面中部设置保温冒口。2.如权利要求1所述的一种高镍奥氏体球墨铸铁发动机排气管背部进火工艺,其特征在于:所述进火口设置在排气管本体的背部和/或出气法兰面。3.如权利要求1所述的一种高镍奥氏体球墨铸铁发动机...
【专利技术属性】
技术研发人员:程凯,田书涛,史玉锋,李小娟,袁超林,王金双,
申请(专利权)人:西峡县内燃机进排气管有限责任公司,
类型:发明
国别省市:河南,41
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