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天津車輛彈簧厂卷簧用的心軸,过去完全是用45鋼制成。制做时先鍛成毛胚,再加工成心軸,这样材料和工时的消耗都很大。去年我厂技术員提出用球墨鑄鉄代替45鋼来制造心軸,經試驗証明它的机械性能和抗拉强度都合乎要求,使用了一年多沒有发生任何問題,使用寿命和鋼制的完全一样。經过計算全年可以节約鋼材3600公斤,并使心軸制造成本降
The mandrel used for coil springs in the Tianjin Vehicle Spring Plant was completely made of 45 steel. When the system is made, it is forged into a blank embryo and then processed into a mandrel. This consumes a lot of material and man hours. Last year, our factory technician proposed to replace the 45 steel with a spheroidal cast for mandrels. After testing, it proved that its mechanical properties and tensile strength are all in compliance with the requirements. It has been used for more than a year without any problems. Its service life and steel complete same. After calculation, 3,600 kilograms of steel can be saved throughout the year and the manufacturing cost of the mandrel is reduced