pipe crown
压力型顶镦弯管 Pressure-type booster tube-bending
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.
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