| 不锈钢铸造工艺的两大基本特点 |
| 添加时间：2018/3/19 16:34:11 浏览次数： |
| 由于不锈钢精细铸造的缩短大大超过铸铁，为避免铸件呈现缩孔、缩松缺点，在铸造工艺上大都选用冒口和、冷铁和补助等办法，以完成次序凝结。 Because the shortening of stainless steel precision casting is much higher than that of cast iron, in order to avoid the shrinkage and porosity of castings, the risers, chills and subsidies are mostly used to complete the order setting. 为避免不锈钢铸件发生缩孔、缩松、气孔和裂纹缺点，应使其壁厚均匀、避免尖角和直角结构、在铸型用型砂中加锯末、在型芯中加焦炭、以及选用空心型芯和油砂芯等来改进砂型或型芯的让步性和透气性。 In order to avoid the occurrence of stainless steel casting shrinkage, porosity and crack defects, should make the uniform wall thickness, avoid sharp corners and rectangular structure, in casting sand, sawdust in core and coke, and the selection of hollow core and oil core to improve the yield of sand or cores and air of. 由于钢液的流动性差，为避免铸钢件发生冷隔和浇缺乏，铸钢件的壁厚不能小于8mm;选用干铸型或热铸型;恰当进步浇注温度，一般为1520°～1600℃，由于浇注温度高，钢水的过热度大、保持液态的时间长，流动性可得到改进。可是浇温过高，会引起晶粒粗大、热裂、气孔和粘砂等缺点。 Because of the fluidity of molten steel, in order to avoid the occurrence of cold steel castings and casting by lack of wall thickness of steel castings, not less than 8mm; the dry cast or hot mould; the proper progress of pouring temperature is 1520 DEG to 1600 DEG, because of high temperature casting, molten steel superheat, keep the liquid time long, liquidity can be improved. But the high temperature can cause the defects of coarse grain, hot crack, gas hole and sanding. 因此一般小型、薄壁及形状杂乱的精细铸造件，其浇注温度约为钢的熔点温度+150℃;浇注体系的结构力求简略、且截面尺度比铸铁的大;大型、厚壁铸件的浇注温度比其熔点高出100℃左右。 Therefore, generally, the casting temperature of small, thin walled and disordered shape castings is about +150 melting point of molten steel. The structure of gating system is simple and the section size is larger than that of cast iron. The pouring temperature of large and thick wall castings is higher than that of its melting point, which is about 100 degrees. |
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