Interlocking Flanged Bushing Stamping Process
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Solution Overview
Problem
Existing methods for forming flanged bushings, such as roll forming and draw forming, result in extensive material stretching and deformation, leading to material thinning, wrinkling, or rupture, and create discontinuities that concentrate stresses and loads, potentially causing separation or decoupling of the bushing.
Innovation Solution
A method involving a stamping assembly that transforms a metal strip into a fully flanged bushing with interlocking features by trimming and punching to create tabs and interlocking members, forming an annular shape, and flanging the workpiece with tabs positioned co-planar on the flange, which fills in the 'V' shaped gap and provides adjacent material support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flange's radial distance is increased to provide greater support area, then the flange can support more load, but the material stretching becomes excessive causing thinning, wrinkling, or rupture
Solution Approach 1:
The flange is segmented into multiple radial sections or zones with varying thickness or reinforcement. This allows the flange to support higher loads through distributed structural support while controlling material stretching in any single location, preventing thinning and rupture.
Solution Approach 2:
The flange design transitions from a simple planar radial extension to a three-dimensional structure with vertical thickness variation, reinforcement ribs, or layered construction. This adds a dimensional aspect that increases load support capacity without proportionally increasing radial area, thereby reducing material stretching requirements.
2Reliability
If a discontinuity is introduced to relieve excessive stretching, then material thinning and wrinkling are reduced, but stress concentration increases causing potential separation or decoupling
Solution Approach 1:
The discontinuity is designed with locally varied properties such as varying depth, width, or shape along its length. Certain sections may be deeper or wider to provide stress relief where needed, while other sections maintain continuity to preserve structural strength. This local differentiation allows simultaneous achievement of both material integrity and stress resistance.
Solution Approach 2:
The discontinuity incorporates built-in stress distribution features such as rounded transitions, tapered sections, or integrated reinforcement elements that cushion and distribute stresses before they can concentrate at any single point. This preemptive stress management prevents separation while maintaining material integrity.
3Productivity
If roll forming or draw forming processes are used to achieve the final bushing form, then manufacturing efficiency is improved, but extensive material stretching occurs causing work hardening and grain structure deformation
Solution Approach 1:
The bushing is pre-formed into a near-final shape with minimal stretching requirements before the final forming operation. Intermediate forming steps or pre-shaping operations are performed to reduce the magnitude of deformation needed in subsequent steps, thereby maintaining material property uniformity while achieving manufacturing efficiency.
Solution Approach 2:
The forming process parameters are optimized and varied through multiple stages, including temperature control, strain rate adjustment, and tooling geometry modification. These parameter changes allow the material to undergo necessary deformation with minimal work hardening and grain structure deformation, maintaining uniform material properties throughout the final product.
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 prevents excessive stretching and material failure by providing continuous support to the flange, reducing stress concentration and enhancing the structural integrity of the bushing.
Implementation Method 1
The workpiece is formed into an annular shape by abutting a portion of the first trimmed edge with the workpiece's second opposing end
Implementation Method 2
The annular form is then flanged creating a radial flange
Data Source
AI summary
The provided process creates a fully flanged interlocked bushing by feeding a metal strip into a stamping assembly having a plurality of tool stations. The stations blank a workpiece from the metal strip, and trim the workpiece's two opposing ends forming a triangular shaped tab and a puzzle locking feature on either end. The workpiece is then formed into an annular shape, wherein the triangular shaped tabs are overlapped as the opposing ends are abutted and interlocked. A flange is then imparted into the side wall of the workpiece relieving the tab's overlapping condition, causing the tabs to abut one another and become co-planar with the flange. This creating a fully flanged part with a tightly fitted parting line. This invention also includes products formed by the aforementioned process.