As for flat roll of F4 ~ F6 stands, their pre-grinding crowns were optimized and the flatness of strips was greatly improved.
对F4 ~ F6机架平辊的预磨凸度进行优选，明显改善了带钢的平直度。
2
Batten: One of several flexible strips of wood placed in pockets at the outer edge of a sail to keep it flat.
木条，板条：几块放在船帆外部用以保持船帆平整的柔韧木条。
3
A flat-end cutter was used, its paths were generated based on the constant scallop height principle and machining strips were enlarged by adjusting inclinati.