FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling. Mandrel consists of working, locking and end sections with mandrel ring fitted on end part. Safety margin in increased by making the mandrel working part consisting of three or more n periodical taper sections of decreasing diameter connected by two or more n-1 taper transitions, transition length Ii making 50-100 mm. Larger lengths are located between larger-diameter taper sections. Note here that difference between end diameters of every taper section Δd makes 2.0-4.0 mm, larger values of said difference being relates to taper section of larger diameter. Note here that the difference between diameters of tape transition between taper sections Δi is specified.
EFFECT: higher safety margin in commercial production.
1 dwg
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