Transformation of metal from slug shape to tube shape by the impact extrusion process does mot involve any assembly of parts in the fabrication of collapsible tubes.

 
  • 在制作(装)膏状物小(金属)管过程中,将条状(或是块状)的金属通过冷挤压转化为管状的工序并不包含任何零件的装配。
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