毛刺：过多余量从锥模和顶模中挤出后引起的软滚子缺陷。
FLASH : Green roller defect, caused by excessive stock forced out between taper die and head die.
顶模是弯管全套模具的重要部件，它的设计直接影响弯管质量和弯管效率。
The top die is the important component of the complete set of pipe-bending die, the design of which directly impact the bending quality and the bending efficiency.
将一块大小足以充填模腔并能稍有溢出的加热金属放入底模，并将顶模加压合拢，这块金属便获得该模腔的形状。
A piece of hot metal sufficient to slightly overfill the die shape is placed in the bottom die, and the top die is forced against it, so that the metal takes the internal shape of the die.
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