Cylindrical Member Joining with Pre-Grooving After Roller Bending
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Solution Overview
Problem
The existing methods for manufacturing core barrels in nuclear reactors face challenges in achieving accurate joining of thick plate materials due to deformation during roller bending, leading to difficulties in electron-beam welding and resulting in low-quality cylindrical members.
Innovation Solution
A method involving end bending, primary grooving, bending into a ring shape, secondary grooving, and electron beam welding of the plate material's end portions to ensure precise alignment and minimize deformation, allowing for high-quality cylindrical member production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thick plate material is subjected to roller bending to form a ring shape, then the cylindrical member can be manufactured, but the joining surface of each end portion deforms making highly accurate joining difficult
Solution Approach 1:
The patent applies preliminary action by performing grooving operations on the end portions before the final joining process. The grooves are created in advance to compensate for and control the deformation that occurs during roller bending, ensuring that the joining surfaces remain accurate despite the bending process.
Solution Approach 2:
The patent changes the physical parameters of the end portions by creating grooves with specific dimensions and geometries. These parameter changes in the end portion structure allow for compensation of deformation and enable precise joining even after roller bending has caused some distortion.
2Strength
If end portions are joined by electron-beam welding, then strong joining is achieved, but deformation of the joining surface prevents highly accurate joining
Solution Approach 1:
The grooving operation is performed as a preliminary action before electron-beam welding to pre-position and stabilize the end surfaces. This preliminary grooving ensures that when electron-beam welding is applied for strong joining, the surfaces remain properly aligned and accurate despite the intense heat and potential deformation from the welding process.
3Shape
If roller bending is used to form the plate material into a ring, then the cylindrical shape is achieved, but the end surfaces become non-parallel reducing joining quality
Solution Approach 1:
The patent changes the geometric parameters of the end surfaces by creating grooves that compensate for the non-parallelism introduced by roller bending. The groove dimensions and positions are specifically designed to restore parallelism between the end surfaces, enabling high-quality joining while maintaining the required cylindrical shape.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables accurate and deformation-free joining of the plate material's end portions, resulting in a high-quality cylindrical member with reduced welding distortion and improved manufacturing precision.
Implementation Method 1
ending portions of a plate material are joined by electron beam welding
Data Source
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AI summary
Provided is a method for manufacturing a cylindrical member which includes end bending (S11) of respective end portions of a plate material (101) in a longitudinal direction, primary grooving (S12) of respective end surfaces of the plate material (101) subjected to end bending, bending (S13) of the plate material (101) to a ring shape, secondary grooving (S14) of respective end surfaces (103, 104) of the plate material (101) subjected to bending in a ring shape, and joining (S15) of respective end surfaces (104) of the plate material (101). Therefore, it is possible to manufacture a high-quality cylindrical member.