Supporting Member Screw Fastening Deformation
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Solution Overview
Problem
Conventional methods for fastening components to metal plate members using screws often result in deformation of the metal plate, leading to misalignment of screw axes with female thread axes, which can cause breakage of the female thread portion and compromise the stability and accuracy of the fastening process, especially when using thin metal plates.
Innovation Solution
A supporting member is designed with a metal plate member that includes a first plate portion with a female thread, a second plate portion hemmed to contact the first plate portion, and a third plate portion bent at a right angle, creating a structure that prevents interference and supports the female thread during screw fastening, thereby minimizing deformation and maintaining axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a screw is fastened to a metal plate member, then another component part can be mounted on the metal plate member, but the metal plate member is deformed so as to be inclined with respect to the screw inserting direction, causing the female thread portion to break
Solution Approach 1:
The metal plate member is segmented into multiple functional portions: a first plate portion containing the female thread portion, a second plate portion providing support, and a third plate portion extending in a different direction. This segmentation distributes the fastening forces across different regions, preventing localized deformation that would cause the female thread portion to break while maintaining mounting capability.
2Ease of operation
If the metal plate member is deformed during fastening with the screw, then the position of the screw axis and female thread portion axis are displaced, but this leads to breakage of the female thread portion
Solution Approach 1:
Different portions of the metal plate member are given different structural qualities: the first plate portion contains the female thread portion, the second plate portion is positioned to provide support during fastening, and the third plate portion extends in a direction that prevents interference. This local differentiation of structural properties ensures that each region performs its specific function, maintaining axis alignment while allowing the fastening operation to proceed.
3Device complexity
If a simple metal plate member structure is used, then manufacturing is simple, but deformation occurs during screw fastening
Solution Approach 1:
The metal plate member transitions from a simple two-dimensional plate to a three-dimensional structure by adding a third plate portion that extends in a direction different from the first and second plate portions. This dimensional change creates a more stable spatial configuration that resists deformation during fastening while maintaining relative manufacturing simplicity through integrated forming processes.
Data Source
AI summary
A supporting member includes a first plate portion including a supporting surface, a first hole, and a female thread portion formed at an inner peripheral surface of the first hole; a second plate portion provided by hemming the metal plate member; a third plate portion provided by bending the metal plate member at one end portion of the second plate portion at substantially a right angle; and a second hole continuing between the second and third plate portions so that the screw threadably engageable with the female thread portion is prevented from interfering with the second and third plate portions. The second and third plate portions provide a bent portion therebetween positioned within a range of a nominal diameter of the female thread portion with respect to a thickness direction of the third plate portion, as seen in a direction perpendicular to the thickness direction.