vulcanizer

例句：

1. 1. The vulcanizer is used to melt metals into a uniform shape.
   锻压机用于将金属熔化成均匀的形状。
2. 2. The vulcanizer has been upgraded to handle larger pieces of steel.
   锻压机已被升级，能够处理更大的钢铁块。
3. 3. The vulcanizer was the first machine to create steel ingots.
   锻压机是第一个制造钢锭的机器。