Accumulator Exterior Body Joining to Prevent Weld Gaps
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Solution Overview
Problem
The existing manufacturing method for accumulators, which involves welding the bottom, shell, and port, often results in detachment of connection portions during conveyance and a subsequent decrease in fatigue strength of the exterior body after joining.
Innovation Solution
A manufacturing method that involves press fitting the bottom into the shell and melting and solidifying a region including a part of the connection portion, followed by press fitting the port into the shell and welding the connection portions, ensuring continuous pressure contact without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bottom, shell, and port are welded together in the conventional manufacturing method, then the connection portions are joined, but detachment occurs during conveyance and fatigue strength decreases after joining
Solution Approach 1:
The invention applies preliminary action by press-fitting the bottom and port into the shell before welding. This preliminary mechanical connection ensures that the connection portions remain stable and detached-free during conveyance, and maintains continuous pressure contact during welding to prevent gap formation, thereby improving both reliability and fatigue strength
Solution Approach 2:
The invention changes the physical state and contact parameters of the connection portions by applying continuous pressure during the press-fitting process. This pressure contact is maintained throughout welding, ensuring optimal welding conditions and preventing gap formation, which improves both the stability and fatigue strength of the joints
2Ease of manufacture
If the connection portions are joined by welding, then the exterior body is assembled, but gaps form after joining which lowers fatigue strength
Solution Approach 1:
The invention maintains the parameter of continuous pressure contact during the entire welding process. By press-fitting components before welding and maintaining this pressure during welding, the invention prevents gap formation at connection portions, ensuring high fatigue strength while keeping the manufacturing process straightforward
Solution Approach 2:
The preliminary press-fitting action establishes continuous pressure contact before welding begins. This preliminary action ensures that no gaps form during welding, eliminating the need for complex gap-prevention mechanisms while maintaining high fatigue strength
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 effectively suppresses detachment of connection portions during conveyance and maintains the fatigue strength of the exterior body after joining, enhancing the durability and reliability of the accumulator.
Implementation Method 1
press fitting the port into the shell
Implementation Method 2
melting and solidifying a region including a connection portion which has been press fitted
Data Source
AI summary
A manufacturing method for manufacturing an exterior body of an accumulator including a bottom, a shell, and a port, includes: press fitting the bottom into the shell; and melting and solidifying a region including a part of a connection portion between the bottom and the shell which has been press fitted.