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To produce a flanged pipe unit, a separate flange is put on a pipe and then the pipe is subjected to a punching to achieve an interlocked connection between the flange and the pipe. The flanged pipe unit produced by the method of the invention comprises a metal pipe including a larger expanded porti

To produce a flanged pipe unit, a separate flange is put on a pipe and then the pipe is subjected to a punching to achieve an interlocked connection between the flange and the pipe. The flanged pipe unit produced by the method of the invention comprises a metal pipe including a larger expanded portion, a smaller expanded portion and a raised portion which are axially aligned so that the smaller expanded portion is placed between the larger expanded portion and the raised portion; and a metal flange having a through bore through which the pipe passes, the through bore including a larger diameter portion, a smaller diameter portion and a tapered end portion which are axially aligned so that the smaller diameter portion is placed between the larger diameter portion and the tapered end portion. The larger expanded portion, the smaller expanded portion and the raised portion of the pipe are intimately engaged with the larger diameter portion, the smaller diameter portion and the tapered end portion of the through bore respectively thereby to establish a dove-tail coupling between the pipe and the flange.

대표청구항 ▼

1. A device for producing a flanged pipe unit, comprising:a clamping tool including holding blocks by which a pipe is held, a plurality of supporting pins slidably received in respective holes formed in the holding blocks, springs for biasing said supporting pins in one direction thereby to project

1. A device for producing a flanged pipe unit, comprising:a clamping tool including holding blocks by which a pipe is held, a plurality of supporting pins slidably received in respective holes formed in the holding blocks, springs for biasing said supporting pins in one direction thereby to project the pins from said holding blocks by a given degree, and a detachable stopper positioned away from said holding blocks, wherein said pipe abuts at its leading end with said detachable stopper to position said pipe; and a punching tool including a punching rod having a spherical head portion, a flange holder slidably disposed on said punching rod and a spring compressed between a base of said punching rod and said flange holder.