Three-step hydraulic precise forming die and method for rectangular corrugated pipe
The invention discloses a three-step hydraulic precise forming die and method for a rectangular corrugated pipe. The three-step hydraulic precise forming die is characterized in that a lower core shaft and a lower end cover are placed on the surface of the center of a lower guide plate, a rectangula...
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Format: | Patent |
Sprache: | chi ; eng |
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