第四部分对球透镜的制备工艺进行研究，包括槽沉法制备球透镜、球透镜的抛光和基本性能测试。
In the fourth part, the researches of preparation technology are proceeded, including fabricating ball lenses using sagging method, polishing of ball lenses and basic performance measurement.
本文还提供了等温淬火球墨铸铁基本性能的技术回顾，包括各种各样的优点：良好的力学性能，以及独特的铸造工艺。
The paper also provides a technical review of the Austempered Ductile Iron fundamentals including various advantageous, mechanical properties and the unique casting process.
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