"板条辊轧机" can be translated as "slat rolling mill" or "bar and strip rolling mill" (depending on the specific context and the type of slat or bar being processed).
"Slat rolling mill" is a more direct translation if referring specifically to a machine for rolling slats.
"Bar and strip rolling mill" is a broader term that may encompass machines for rolling various bar and strip products, which could include slats as a subset.
In technical or industrial contexts, the exact translation might vary slightly based on the machine's specific design, purpose, and the industry standards in use. If "板条" refers to a specific type of profile or product, a more precise translation might be required, but "slat rolling mill" is a reasonable and commonly used approximation.