Adhesive-Bonded Cylindrical Joint for Higher Torsional Strength
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Solution Overview
Problem
The existing manufacturing methods for cylindrical bodies, such as those described in Japanese Patent Laid-Open No. 2011-121682, often result in insufficient strength due to inadequate bonding and structural integrity.
Innovation Solution
A cylindrical body is formed by bending a metal plate into a cylindrical shape and using a nonmetallic adhesive member to bond the end faces, where the adhesive is strategically placed between non-parallel parts of the end faces to enhance bonding strength and torsional rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal plate is formed into a cylindrical shape by facing the end faces, then the manufacturing cost is reduced, but the strength and torsional rigidity are insufficient
Solution Approach 1:
The end faces of the cylindrical member are processed in advance to create non-parallel surfaces (tapered or angled ends) before assembly. This preliminary action ensures that when the ends are bonded, they form a mechanically interlocked structure that resists torsional forces, thereby improving strength without increasing manufacturing complexity
Solution Approach 2:
The invention uses a combination of metal plate material and adhesive material to create a composite cylindrical structure. The adhesive layer between the non-parallel end faces creates a bonded joint that significantly enhances torsional rigidity compared to simple butted joints, while maintaining the low-cost advantage of forming the cylinder from a single metal plate
2Device complexity
If the end faces are bonded using conventional methods, then the manufacturing process is simple, but the bonding strength is insufficient
Solution Approach 1:
The end faces are made asymmetric or non-parallel to each other, creating a tapered or angled configuration. This asymmetry prevents the ends from simply sliding past each other under load and creates a mechanical interlock that significantly improves bonding strength. The non-parallel configuration ensures that bonding forces are distributed more effectively across the joint area
Solution Approach 2:
The non-parallel configuration of the end faces is prepared in advance during the forming process, before the bonding operation. This preliminary preparation of the bonding surfaces ensures that when adhesive is applied, the joint geometry itself contributes to strength, not just the adhesive material
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
The solution significantly improves the torsional strength and durability of the cylindrical body while maintaining cost-effectiveness, making it suitable for various applications requiring high accuracy and reliability.
Implementation Method 1
a nonmetallic adhesive member bonding the first end face to the second end face
Data Source
AI summary
A cylindrical body includes a cylindrical member, made by forming a metal plate into a cylindrical shape such that the two end faces of the metal plate face each other, and a nonmetallic adhesive member bonding the two end faces together. The two end faces each include an adhesive part, and the adhesive member is disposed between the adhesive parts of the end faces. The adhesive part of one end face is not parallel to the adhesive part of the other end face. Each end face also includes a contact part which is in contact with the contact part of the other end face.