Tapered coiling technology for high-strength large-size plate

Abstract

The invention discloses a tapered coiling technology for a high-strength large-size plate, which comprises the following steps of: (1) making equant marks on a to-be-coiled fan-shaped plate; (2) causing an upper roller of a plate-coiling machine to be lower than a theoretical distance of an upper surface of the fan-shaped plate when a big-head end of the fan-shaped plate is coiled and causing the upper roller of the plate-coiling machine to be lower than the theoretical distance of the upper surface of the fan-shaped plate when a small-head end of the fan-shaped plate is coiled; (3) calculating a resilience value of the fan-shaped plate; and (4) successively coiling the big-head end and the small-head end in sequence. Compared with the prior art, the technology provided by the invention has the advantages that a joint of the big-head end and the small-head end is smoothly transited; the problem that a design demand is not met because of the insufficient accuracy caused by the overlong fan-shaped plate is solved; and meanwhile, the problems that an upper rolling bearing and a supporting bearing of the plate-coiling machine are easily abraded and a roller wheel of the plate-coiling machine is seriously damaged by adopting the traditional rotary feeding coiling technology are avoided. Therefore, the tapered coiling technology for the high-strength large-size plate has the advantages that the products manufactured by adopting the technology are ultrahigh in precision, the products are once formed in the subsequent wholly splicing, assembling and centering, and the staggered joint quantity is small.

Description

technical field [0001] The invention relates to a tapered rolling process of a high-strength large-size plate body. Background technique [0002] The CB20 cone module of AP1000 nuclear power containment duplex stainless steel water tank needs to roll a fan-shaped plate to meet the installation requirements. Since the fan-shaped plate is made of American standard duplex stainless steel, the yield strength of this material is above 450MPa, which is higher than that of ordinary materials. The yield strength is much higher. If the previous rotary feeding rolling process is used, it is very easy to wear the bearing and support of the upper roll of the plate rolling machine. The rollers of the ring bending machine will be seriously damaged during the mutual extrusion of the retaining wheels. On the other hand, because the length of the conical plate is too long (up to 8452mm), in order to achieve the purpose of passive design, the conical sub-module needs to be precisely docked w...

AI Technical Summary

Problems solved by technology

[0005] The process of the present invention adopts the method of rolling the big end and the small end respectively successively, and has overlapped parts when rolling the big end and the small end, so that the junction of the big end and the small end is smoothly transitioned, and the problem caused by the sector is solved. The board is too long, resulting in insufficient precision, which cannot meet the design requirements; at the same time, the present invention divides the large end and the small end into several equal parts, and rolls each equal part separately, that is, the size can be easily completed. The coiling of the head avoids the use of rotary feeding rolling process in the past, which is very easy to wear the upper roller bearing and support of the plate rolling machine. The problem that the rollers of the ring bending machine will be seriously damaged during the mutual extrusion process with the retaining wheel