省煤管(又名颚片管)是我厂锅炉产品上大量生产的铸件:全长2米,壁厚只8毫米,外圈有散热片。铸件要经过水压试验(50公斤/公分~2),不准有渗水、漏水现象。这一点在我们铸造省煤管的六年历史中,一直没有得到彻底解决。省煤管的型芯长达2400毫米,过去我们从理论计算和实际经验上都认为必须采用泥芯撑;不然,泥芯由于受到铁水的浮力会被抬起来,造成铸件管 Coal pipe (also known as the jaw tube) is a large-scale production of castings on our boiler products: 2 meters in length, wall thickness of only 8 mm, the outer ring with heat sink. Casting to go through hydrostatic test (50 kg / cm ~ 2), are not allowed to seepage, leakage phenomenon. This has not been completely solved in our six-year history of coal-saving pipes. Coal core of the core up to 2400 mm, in the past we have both theoretical calculations and practical experience that must be used mud core support; otherwise, the mud core due to the buoyancy of molten iron will be lifted, resulting in casting tube