Composite Fluid Application Tube for Centrifugal Casting Wear Reduction

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Solution Overview

Problem

The fluid application outer tube in centrifugal casting devices experiences friction and abrasion issues due to its cantilevered design, leading to premature wear and maintenance needs, while requiring both weight reduction and strength to handle fluid weight, with limitations on wall thickness reduction.

Innovation Solution

A fluid blow-out structure incorporating a resin hollow tube with a metal tube covering its outer surface, featuring a tapered inner surface and constant outer diameter, which supports weight reduction and abrasion resistance, and optionally using light metals for further weight and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of moving object

If the fluid application outer tube is made thinner to reduce weight, then weight reduction is achieved, but strength and abrasion resistance deteriorate

Engineering Contradiction:

Improveweight of fluid application outer tubeVSAvoidstrength and abrasion resistance

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The fluid application outer tube is constructed as a composite structure with a resin hollow tube as the base and a metal tube covering its outer circumferential surface. This composite design allows the resin to provide lightweight structural support while the metal layer delivers the necessary strength and abrasion resistance against the guide mechanism, thereby achieving weight reduction without compromising mechanical performance

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal tube is applied selectively on the outer circumferential surface where abrasion resistance is most needed, particularly in regions contacting the guide mechanism. This localized reinforcement approach ensures that material is added only where required for friction resistance, rather than uniformly thickening the entire tube, thus optimizing the balance between weight and abrasion resistance

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If the wall thickness is reduced to improve weight reduction, then weight decreases, but the ability to bear fluid weight deteriorates

Engineering Contradiction:

Improveweight of fluid application outer tubeVSAvoidability to bear fluid weight

Core Design Contradiction:

Weight of moving objectVSForce

Solution Approach 1:

The composite structure of resin hollow tube plus metal tube provides sufficient load-bearing capacity even with reduced wall thickness. The metal tube reinforces the structure to support fluid weight while the resin core maintains lightweight characteristics, allowing thin-walled design without compromising structural integrity

Inventive Principle:

Principle #40Composite materials

3Length of moving object

If the fluid application outer tube is made longer to reach the mold, then coverage is improved, but bending due to gravity increases

Engineering Contradiction:

Improvelength of fluid application outer tubeVSAvoidbending of leading end

Core Design Contradiction:

Length of moving objectVSShape

Solution Approach 1:

The metal tube covering the resin hollow tube enhances the overall rigidity and bending resistance of the long fluid application outer tube. This composite construction prevents the leading end from bending downward under gravity during insertion operations, maintaining proper alignment with the guide mechanism throughout the tube's length

Inventive Principle:

Principle #40Composite materials

4Area of moving object

If the fluid application outer tube is made thinner for small product manufacturing, then diameter is reduced, but vulnerability to friction increases

Engineering Contradiction:

Improvediameter of fluid application outer tubeVSAvoidfriction and wear

Core Design Contradiction:

Area of moving objectVSObject-affected harmful factors

Solution Approach 1:

The metal tube layer is applied on the outer circumferential surface of the thin-walled resin hollow tube, providing a hard, friction-resistant surface that protects the thinner tube body from wear caused by contact with the guide mechanism, enabling small-diameter design without increasing vulnerability to friction

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal coating is applied specifically on the outer surface regions subject to friction with the guide mechanism, providing localized abrasion resistance where needed most, while allowing the tube to maintain its reduced diameter for small product manufacturing

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11642722B2Fluid blow-out structure

Publication Date: 2023.05.09 HONDA MOTOR CO LTD

AI summary

A fluid blow-out structure of a centrifugal casting device 1, for blowing out a fluid to inner surface of a rotating cylindrical mold 2, including: fluid application outer tube 5 inserted into the mold 2; movable mechanism 6 supporting a base end of the fluid application outer tube 5; outlet 8 through which the fluid is blown out, the outlet 8 provided at a leading end of the fluid application outer tube 5; fluid supply tube 9 inserted in the fluid application outer tube 5 and connected to the outlet 8; and guide mechanism 7 contacting an outer circumferential surface of the fluid application outer tube 5, and guides the fluid application outer tube 5 into and out of the mold 2. The fluid application outer tube 5 includes a resin hollow tube 10 and a metal tube 11 covering outer circumferential surface of the resin hollow tube 10.