Fitting and Annular Protrusions to Eliminate Press-Fit Join Gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The Ring Mash joining method often results in a not-joined portion between the fitting and annular members as the press-fitting depth increases, leading to unfavorable burr formation and gaps.
Innovation Solution
The fitting member is designed with a protrusion on its outside face, and the annular member with a protrusion on its inside face, both extending towards the potential not-joined areas, ensuring complete contact and preventing the occurrence of not-joined portions during the joining process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If press-fitting depth is increased to achieve deep joining and coaxial accuracy, then joining depth and coaxial accuracy are improved, but not-joined portions and gaps are produced between members
Solution Approach 1:
The fitting member is provided with a fitting protrusion that extends outward from the outside face, and the annular member is provided with an annular protrusion that extends toward the inside space from the inside face. These protrusions are formed in advance to prevent not-joined portions from occurring during the joining process, thereby ensuring complete contact between members while maintaining deep joining and coaxial accuracy
2Length of moving object
If press-fitting depth is increased to achieve deep joining, then joining depth is improved, but burr formation and not-joined portions occur
Solution Approach 1:
The fitting protrusion and annular protrusion are formed in advance on the fitting member and annular member respectively. These protrusions ensure complete contact between members during joining, preventing not-joined portions and reducing burr formation even when achieving deep joining
Solution Approach 2:
The protrusions are strategically positioned to convert potential not-joined portions and gap formations into beneficial contact areas. By extending into the potential not-joined areas, the protrusions transform what would be harmful gaps into productive joining surfaces, eliminating burr formation while maintaining deep joining
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 configuration allows for the prevention of not-joined portions and burr formation, enhancing the joining process by ensuring solid-phase contact and eliminating the need for subsequent machining steps, thus improving manufacturing efficiency.
Implementation Method 1
the annular metal member and the rod-like metal member are overlapped slightly and supplied with a current under a pressure so that those member are softened by Joule heat and joined together
Data Source
AI summary
To provide a fitting member, an annular member, a joined member and a method of manufacturing the joined member, which prevent occurrence of a not-joined portion. A fitting member 10 has a fitting protrusion 10p which is protruded outward on an outside face 10s. An annular member 20 contains a space 20h in which the fitting member 10 is to be fitted. An annular member 20 has an annular protrusion 20p on an inside face 20f. When the fitting member 10 is fitted into the space 20h at a predetermined depth, the fitting protrusion 10p and the annular protrusion 20p fill not-joined portions which may be generated assuming that they are not provided. A joined member 30 is produced by fitting the fitting member 10 into the space 20h at the predetermined depth, so that a contact portion between the fitting member 10 and the annular member 20 is joined in solid phase.