| 摘要 |
A tubular body having integral branch tubes for use in a distribution tank of a car air conditioner and a method for producing such tubular body. The tubular body is produced almost solely by a deformation process. The process for forming the tubular body includes a swelling step for swelling the sheet metal at predetermined positions to create cylindrically swelled portions by several stages, a boring step for boring the top end of the swelled portion to create branch tubes, a channel creating step for creating mating channel throughout the whole length of the sheet metal, a rounding step for rounding the sheet metal to form a tube having a desired sectional shape, and a mating step for mating the end of the rounded sheet metal with the mating channel. The production process further includes a divider creating step for dividing the space in the tubular body into a plurality of compartments by squeezing the tubular body. Preferably, the production method further includes a thickness increasing step for increasing the thickness at the mating channel.
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