Plug is one of the key deformation tools in crosspiercing. Its function is turning a solid bar into a hollow bloom.
顶头是斜轧穿孔主要的变形工具之一,其作用是将实心管坯穿轧成一定壁厚的空心毛管。
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In the crosspiercing process, as the piercing precession power can not overcome the resistance force, it will lead to rear-jamming when rolling thick-wall tubes or high alloy tubes.