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利用干砂消失模铸造工艺 ,对铸铁件表面合金化铸渗机理进行了研究 ,通过建立数学模型 ,对铸渗过程中铁水传输进行了理论分析 ,给出了铸渗量与浇口的大气压力、铁水静压力、渣液阻力及附加压力的关系式 ,提出了铸渗量大小主要取决于铸渗孔道半径的新观点 .用正交试验对合金涂层中合金粉粒度、合金粉加入量、溶剂加入量及涂层中聚苯乙烯泡沫加入量等进行了考证 ,得出最佳工艺配方为 :合金粉粒度 75 10 0目 ;泡沫加入量 30 % 5 0 % (φ(B) ) ;溶剂加入量 4% .在配制合金涂料时 ,适当加入一定量泡沫珠粒 ,有利于母液渗透 ,这与理论推导结果相符 ,易获得 3mm以上合金层厚度 .合金层具有珠光体基体及大量M7C3 碳化物 ,并具有高硬度及高抗磨性
By using dry sand extinction die casting process, the mechanism of alloying infiltration on the surface of cast iron was studied. The mathematical model was established to analyze the hot metal transport in the process of infiltration and infiltration. The relationship between infiltration capacity and gate pressure , Hydrostatic pressure, slag resistance and additional pressure, the new viewpoint that the amount of infiltration and infiltration is mainly determined by the radius of the infiltration tunnel is proposed.Orthogonal test was used to study the effects of the alloy powder size, alloy powder addition, The amount of added solvent and the amount of polystyrene foam in the coating were investigated. The optimum technological formula was obtained: 75 10 0 mesh size of alloy powder, 30% 50% foam (φ (B)), solvent The amount of 4% .In the preparation of alloy coatings, the appropriate amount of foam beads added, is conducive to the mother liquor infiltration, which is consistent with the theoretical deduction, easy access to alloy layer thickness of 3mm above the alloy layer with pearlite matrix and a large number of M7C3 carbide , And has high hardness and high abrasion resistance