| 摘要 |
A cap has a body with an opening defined in one end of the body. A floor is formed in the opening and is parallel to an end wall of the body defining the opening. An annular flange perpendicularly extends from the floor in the opening. With a specific mold and a specific process, the cap can be formed with a die casting process without draft allowance. The process for forming the cap is simple and the cost for manufacturing the cap is low.
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