product news/產品新聞 Te type of iron, chemistry, metallurgical consider-
ations and mechanical/physical properties all will influ- ence the choice of inoculant. In gray iron, for example, the need for a shorter
graphite flake to aid machining and good surface finish can be achieved with Superseed Extra inoculant, whereas Superseed75 is used globally as the preferred inoculant in the production of cylinder liners where the cooling is very rapid and a type A graphite is essential. Ductile iron throws up a raft of challenges. Products such as
Elkem’s patented Ultraseed Ce or the Rare Earth free alterna- tive Ultraseed Zr inoculants can be applied as part of a single or multiple inoculant addition, particularly in shrinkage prone irons. Te new UltraseedZr inoculant also finds application where chunky graphite is a problem. Tese two products also have been found very effective in irons made from pure magne- sium processes, such as converters and wire, where the residual nucleation levels are low. New types of ductile iron mean new challenges. Te increas-
ingly trialled solution-strengthened ferritic irons contain a lot of the graphitizing element silicon. Hence, the requirements of the inoculant are different and the effect is more of a modification than an undoing of the damage caused by magnesium. Too pow- erful an inoculant could promote shrinkage. Te same is true in compacted graphite irons where too much residual magnesium or inoculant lead to an excess of nodules. Careful consideration
needs to be given to the method and quantity of addition. ■ For further information, contact your local Elkem representative or visit us at
www.elkem.com/foundry.
会影响孕育剂的选择。
例如，对于灰铸铁，要获得良好的加工性和好的表 面效果需要较短的片状石墨，可以通过添加Super- seed Extra孕育剂获得，Superseed75在全球应用广 泛，是气缸套生产中优先选用的孕育剂。气缸套要求 的冷却速度非常快，因此A型石墨是必要的。 球墨铸铁对孕育剂提出了一系列挑战。Elkem公司 的专利产品Ultraseed Ce或者可替代稀土的Ultras- eed Zr孕育剂可以单独或配合其他孕育剂使用，尤其 适合在有缩松倾向的铸件中使用。新型UltraseedZr 孕育剂也可用于块状石墨中。这两种产品在添加纯镁 的铸铁中也非常有效，例如残余的成核水平比较低的 中频和工频炉熔炼中。
新型球墨铸铁意味着新的挑战。越来越多的试验 表明，固溶强化铁素体铸铁含有大量促进石墨化的元 素硅。因此，对于孕育剂的要求是不同的，其效果应 比改性孕育剂强，比消除镁元素造成的损坏更强。太 强的孕育可能引起缩松。这个结论同样适用于蠕墨铸 铁，因为残余的镁或孕育剂会产生大量的球状石墨。
添加剂的处理方式和使用量应慎重考虑。 ■ 更多信息，请联系Elkem当地经销商或访问：
www.elkem.com/foundry.
Diecasting Plunger System Tips 压铸柱塞系统的处理技巧
Te market for larger lightweight metal castings is in-
creasing; this is especially true for structural castings. Larger and more complex die castings require a plunger system with supreme thermal and dimensional stability for consistent
大型轻金属铸件的市场在不断扩大，尤其是结构铸件 市场。更大、更复杂的压铸件要求柱塞系统的热稳定性 和尺寸稳定性更好，以保证一致的射速，使工作周期较
Figure 1. The plunger tip over expands and the sleeve contracts near die end.
图1：冲头在冲模末端过度膨胀，而套筒收缩。 74 |
FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION September 2014
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