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日立金属公司对悬架部件的铸件形状采取了独特的设计方法——模型辅助铸件设计解析法,对要求壁薄而又不降低韧性的材料实施控制冷却;在制造薄壁强韧铸件时,为解决壁厚时发生激冷和珠光体量及整个铸件硬度的偏差大问题,改为在相变点A_1(约993K)以上从铸型中取出,一在1123K保持5min,以小于313K/min,的速度缓冷至923K的方法,可使球铁的机械性能达到延伸率>20％,疲劳强度达>6.5MPa。
Hitachi Metals has adopted a unique design approach to the shape of the suspension parts casting - model-assisted casting design analysis of the law requires thinning without reducing the toughness of the material to implement controlled cooling; in the manufacture of thin-walled tough casting, to solve the wall Thick chilled and pearlescent body volume and the hardness of the entire casting large deviation, instead of the phase transition point A_1 (about 993K) removed from the mold, a hold at 1123K 5min, at a speed of less than 313K / min, Slow cooling method to 923K, ductile iron can reach the mechanical properties of elongation> 20%, fatigue strength of> 6.5MPa.