FIELD: metal processing.
SUBSTANCE: invention relates to metal forming, particularly to production of flexible sharp bend seamless branch pipes from various grades of steel. Initial billet is centrifugally cast pipe with specific geometrical sizes and wall thickness. Performing pipe inner surface mechanical boring with bore center offset and producing asymmetric inner surface. At that, pipe bending is performed on pipe-bending mill with certain width zone heating by HF currents, with certain rates until bend angle of 60 degrees and with its further increase and at a certain temperature.
EFFECT: certain selection of workpiece geometrical parameters and bending modes ensure technological process stability and improved quality of bends.
3 cl, 2 dwg, 1 ex
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| PRODUCTION OF 299×10-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL | 2012 |
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| PRODUCTION OF 465×75 MM SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS FROM ESR INGOTS OF "10Х9МФБ-Ш"-GRADE STEEL | 2012 |
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| PRODUCTION OF 530×25-60 mm SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL | 2012 |
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| MANUFACTURING METHOD OF SEAMLESS TUBES WITH DIMENSIONS OF 530×25-30 mm FOR STEAM BOILERS, STEAM LINES AND HEADERS OF PLANTS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS FROM INGOTS OF ELECTROSLAG REMELTING PROCESS FROM STEEL GRADE "10Х9МФБ-Ш" | 2013 |
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