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多孔塑压模型腔板外形尺寸为140×120×12mm,一般有60～70个工作孔,孔径φ1.3～13.3mm不等,孔距公差要求为±0.01～0.03mm,平面翘曲不大于0.02mm,硬度要求为HRC53～58。我厂选用Cr12MoV钢制造,其化学成分为:C 1.45～1.70%、Cr 11～12.5%、Mo 0.4～0.6%、V 0.15～0.30%Mn≤0.05%、Si≤0.4%。这种钢材合金含量高,主要形成(Cr、Fe)_7C_3型碳化物。淬火加热时随加热温度升高,溶入奥氏体中的碳化物量增多,未溶入的碳化物则阻碍晶粒长大,可保持相当韧性。淬火回火后自马氏体析出大量碳化物呈弥散分布,可提高耐磨性。但由于钢中碳化
Porous plastic mold cavity plate dimensions of 140 × 120 × 12mm, generally 60 to 70 working holes, aperture φ1.3 ~ 13.3mm ranging from the pitch tolerance of ± 0.01 ~ 0.03mm, flat warping is not greater than 0.02mm, hardness requirements for HRC53 ~ 58. Our factory choose Cr12MoV steel, the chemical composition: C 1.45 ~ 1.70%, Cr 11 ~ 12.5%, Mo 0.4 ~ 0.6%, V 0.15 ~ 0.30% Mn ≤ 0.05%, Si ≤ 0.4%. This high content of steel alloy, the main formation (Cr, Fe) _7C_3 type carbide. Quenching heating with the heating temperature increases, the amount of dissolved carbides in the increase in the amount of carbide, carbide is not dissolved in the growth of the grain, can maintain a considerable toughness. After quenching and tempering a large number of carbides precipitated from the martensite was dispersed, can improve the wear resistance. But due to carbonization in steel