Multi-curvature forming method for stainless steel cylinder

A molding method and multi-curvature technology, applied in the field of manufacturing stainless steel cylinders

Active Publication Date: 2015-02-11
SHANGHAI TONGHUA STAINLESS STEEL PRESSURE VESSEL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, the present invention proposes a multi-curvature progressive forming method for stainless steel cylinders according to the cylinder rolling forming mech

Method used

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  • Multi-curvature forming method for stainless steel cylinder
  • Multi-curvature forming method for stainless steel cylinder
  • Multi-curvature forming method for stainless steel cylinder

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Experimental program
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Embodiment Construction

[0022] The concrete mode of implementing the present invention is carried out according to the following steps:

[0023] 1. Cut the material according to the unfolded length of the middle diameter of the cylinder to be rolled: determine the cylinder to be rolled 01 ( figure 1 ) parameters: inner diameter Φ, length L, wall thickness δ, middle diameter D = inner diameter Φ + wall thickness δ; cylindrical sheet 3 ( figure 2 ) with the expanded length πD of the cylinder to cut the material, without reserve length; process the welding groove 2 around the sheet metal by mechanical processing method ( figure 2 ), to ensure the quality of the groove to improve the welding quality;

[0024] 2. The first curvature arc rolling forming: put the cylindrical sheet on the upper roller 6 of the rolling machine ( image 3 ) and lower rollers 4, 5 ( image 3 ), the big end of the welding groove 2 faces the upper roll of the bending machine ( image 3 ); Cylindrical sheet 3 ( image 3 ) o...

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Abstract

The invention discloses a multi-curvature forming method for a stainless steel cylinder. The method is characterized by comprising the following steps: performing scribing and blanking according to the developed length of the medium diameter of a cylinder to be wound; machining peripheral welding grooves of a plate; rolling-forming a first-curvature circular arc, namely reserving a straight section, not to be wound for the formation of a circular arc, with a width B of 200 to 600 mm at each of the two ends of the cylindrical plate, and bending and winding the middle part of the cylindrical plate into a large circular arc with a curvature radius R of more than or equal to 0.5 Phi to form the first-curvature circular arc of the cylinder; rolling-forming second-curvature circular arcs, namely rolling the parts between the roots of the straight sections with the widths B of 200 to 600 mm and the large circular arc into circular arcs with curvature radiuses r of 0.2 to 0.5 Phi to form second-curvature circular arcs; rolling transition parts between the second-curvature circular arcs and the first-curvature circular arc into smooth transition; performing rolling until the grooves 2 in the two ends of the straight sections get close to each other; performing longitudinal seam assembly and welding on the cylinder, placing the cylindrical body at a horizontal position, and welding longitudinal seams; performing roundness correction on the cylinder after welding.

Description

technical field [0001] The invention relates to the manufacture of stainless steel pressure vessels, especially the manufacture method of stainless steel cylinders. Background technique [0002] Stainless steel pressure vessels have developed rapidly in recent years, which has played a positive role in the upgrading of production technology and product quality in the fields of medicine, chemical industry, food, and beverages. [0003] Austenitic stainless steel is commonly used for stainless steel pressure vessels. This material has high ductility and allows large deformation during the forming process. However, due to its high hardness and obvious cold hardening characteristics, the deformation is too large and the number of strains is too high. Too much can cause breakage. Secondly, the defects such as scratches, pits, pits and heavy skin on the surface of stainless steel are amplified with the deformation of the sheet during the rolling process, and even directly lead to...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21D5/14
CPCB21D5/14
Inventor 吴新华
Owner SHANGHAI TONGHUA STAINLESS STEEL PRESSURE VESSEL ENG
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