Shrink Ring Extrusion Die Structure for Mandrel Stress Control
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Solution Overview
Problem
Hollow extrusion dies are susceptible to excessive compressive stress during operation, leading to elastic and plastic deformation, distortion, and potential failure, resulting in costly downtime and scrap products.
Innovation Solution
A shrink ring is integrated into the extrusion die, featuring a circumferential groove on the mandrel and a corresponding tab on the die plate, which applies localized compressive stress to the rear portion of the mandrel, reducing deformation and preventing cracking failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hollow extrusion dies are used to produce hollow extruded products, then product complexity and versatility are improved, but the die becomes more susceptible to excessive compressive stress leading to deformation and failure
Solution Approach 1:
The mandrel is divided into multiple segments (first mandrel segment, second mandrel segment, third mandrel segment) connected by connection elements. This segmentation allows each segment to independently bear and distribute compressive stresses, preventing stress concentration and deformation while maintaining the hollow structure needed for producing hollow extruded products
Solution Approach 2:
The connection elements are positioned within circumferential grooves of the mandrel segments, creating a nested structure where connection elements fit inside the mandrel segments. This nested design provides internal support and reinforcement to the hollow mandrel structure, enhancing its resistance to compressive stress without increasing external dimensions
2Shape
If the extrusion die structure is made more intricate to produce hollow shapes, then product shape capability is improved, but manufacturing complexity and susceptibility to stress increase
Solution Approach 1:
The mandrel is segmented into multiple sections that can be manufactured separately using standard machining processes, then assembled using connection elements. This segmentation reduces manufacturing complexity of individual components while achieving the complex hollow shape capability through modular assembly
Solution Approach 2:
The connection elements serve multiple functions: they connect mandrel segments together, provide internal reinforcement against compressive stress, and fit within circumferential grooves to maintain structural integrity. This multi-functionality reduces the need for additional complex components
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 shrink ring effectively reduces elastic and plastic deformation, minimizing distortion and extending the service life of the extrusion die while preventing costly downtime by localizing compressive stress and maintaining the shape of the extruded product.
Implementation Method 1
The distal-end outer peripheral surface of each of the bridge parts and the bridge-holding surface of the holder are joined by shrink-fitting
Data Source
AI summary
An extrusion die includes: a cylindrical mandrel, the mandrel having a circumferential groove formed therein; a cylindrical die plate, the mandrel and the die plate being coupled together; and a shrink ring disposed in the circumferential groove of the mandrel.