FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and may be used for straightening tube ends. Inner surface side straightening die has top surface with circular arc-like cross-section and is secured to inner surface top part. Bottom surface with circular arc-like cross-section is rigidly secured to bottom of base arranged at surface outside section. Note here that every straightening die of inner surface side and that of outer surface are divided into multiple parts and rigidly secured so that clearance between split straightening die parts is located at proper central section of aforesaid dies.
EFFECT: better roundness.
10 cl, 3 dwg, 5 ex, 2 tbl
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