pattern metal
铜铍合金制模 beryllium copper mould mating
指出辊模拔制合金钢棒材比辊模拔丝更能发挥其优越性，并提出了辊模和固定模串联组合的新工艺。
It is pointed out that roller dies are more suitable for drawing alloy steel rods than for drawing wire and thread.
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