Method and apparatus for bending tubes using split bend die

Details Method and apparatus for bending tubes using split bend die Method and apparatus for bending tubes using split bend die

1993-12-27

1994-08-16

Crane, Daniel C.

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

72159, 72150, 72369, B21D 704

Patent

active

053375904

ABSTRACT:
Method and apparatus for bending serpentine heat exchanger tubes using a split bend die having a relatively short upper die section with a straight back end. After the tube is bent in conventional manner using a clamp die and a pressure die, the bend die is split along a shaft and rotated through a predetermined angle to position the straight back end substantially parallel to a straight segment of the tube at the output of the bend die. The input segment of the tube is then moved next to the shaft in preparation for rotating above the input segment to raise the output segment above the upper section of the bend die. Such lateral motion reduces the segment spacing required for clearance of the upper section. Other features for reducing the spacing are providing an indentation on the shaft, angling the back end with respect to the sides to provide a minimum length, and truncation an upper portion along the back end.

REFERENCES:
patent: 4691555 (1987-09-01), Vaughan
patent: 5142895 (1992-09-01), Schuchert
patent: 5187963 (1993-02-01), Sutton, Jr. et al.
patent: 5284041 (1994-02-01), Christensen

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