Segmented Wear Ring for Die-Casting Piston Seal Adaptation

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Solution Overview

Problem

Existing wear rings for die-casting pistons face challenges in providing effective seals and accommodating variations in piston bore dimensions, leading to potential seal failures and costly downtime due to wear and misalignment.

Innovation Solution

A wear ring with an annular body featuring a gap with circumferentially offset pairs of facing surfaces and arc-shaped recesses, allowing for expansion, compression, and rotational adjustment to maintain a secure seal and adapt to irregularities in the piston bore.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional wear ring with a single gap is used, then the structure is simple and easy to manufacture, but the wear ring cannot accommodate variations in piston bore dimensions and leads to seal failures

Engineering Contradiction:

Improveaccommodation of piston bore variationsVSAvoidwear ring structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The wear ring is segmented into multiple sections separated by gaps, allowing each section to move independently to accommodate variations in piston bore dimensions while maintaining the sealing function

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wear ring transitions from a static rigid structure to a dynamic structure with movable sections that can adjust their positions to adapt to irregularities in the piston bore, improving adaptability

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If a wear ring with fixed positioning is used, then the installation is straightforward, but the wear ring cannot be adjusted for misalignment and causes downtime

Engineering Contradiction:

Improveadjustability during installationVSAvoiddowntime due to misalignment

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The wear ring incorporates movable sections that can be adjusted during installation to accommodate misalignment, eliminating the need for costly downtime and complex realignment procedures

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The wear ring allows for changes in the positional parameters of its sections to accommodate misalignment and irregularities in the piston bore, improving ease of operation

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a wear ring without expansion capability is used, then the installation is simple, but the seal effectiveness is compromised due to inability to adapt to bore irregularities

Engineering Contradiction:

Improveseal effectivenessVSAvoidwear ring design

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The wear ring is divided into multiple sections with gaps between them, allowing each section to expand and contract independently to maintain effective sealing contact with the piston bore

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wear ring sections are designed with flexibility to expand and contract, enabling them to adapt to bore irregularities and maintain reliable sealing contact

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS10718433B2Wear ring for die-casting piston, and die-casting piston incorporating same

Publication Date: 2020.07.21 EXCO TECHNOLOGIES LTD

AI summary

A wear ring for a piston of a die-casting apparatus comprises an annular body having a gap extending therethrough, the gap being configured to define at least two circumferentially offset pairs of circumferentially spaced apart facing surfaces. The annular body comprises an axial end face having at least one arc-shaped recess formed therein.