In making rectangular tubes, die sets F300-F301 and F302-F303 are often used as a progressive combination. A slight curvature can be expected on the formed side but, whether it is convex or concave, can be controlled in the forming. Die set F302-F303 has its own locating gauge so the operator does not have to hold the part during the closing operation. This gauge also prevents the part from slipping out of the dies. With metals having large springback, the closed edges will open considerably. If the seam is to be welded closed, a welding jig or fixture will be necessary.
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