相对地地下铁汽车的新不锈钢类型，如此为接近地在门之前仅仅响的铃命名。
Relatively new stainless-steel type of subway car, so named for the bell that rings just before the doors close.
主要介绍了不锈钢球形响壶盖的落料、拉伸、挤边复合模的详细结构、模具工作过程、工艺分析。
Mainly introduced the detailed structure and working process and the technology analysis of the blanking-drawing-extruding compound die for the stainless steel whistle pot cover.
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