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缩松是高牌号灰口铸铁件常见的缺陷之一,它的主要特征是在铸件热节处内部形成微小的缩孔,加工后在加工面上出现团簇状微小孔,有的是分隔的,也有连通的,愈向缩松的中心,孔洞愈大,愈密集。我厂生产防爆电机,防爆规程规定外壳材质灰口铸铁牌号不低于HT25-47,并规定在隔爆加工面否允许出现缩松缺陷及直径大于0.2的孔洞缺陷,如气孔、渣孔、砂眼等。
Shrinkage is one of the common defects of high grade gray cast iron. Its main feature is the formation of tiny shrinkage cavities in the hot section of castings. After processing, clusters of tiny holes appear on the machined surface, some are separated, Connected, the more the center of the contraction, the larger the hole, the more intensive. I plant production of explosion-proof motor, explosion-proof procedures require gray gray cast iron shell material grade is not less than HT25-47, and the provisions of the explosion-proof processing surface is allowed to appear shrinkage defects and hole diameter greater than 0.2 defects such as pores, slag holes, trachoma Wait.