Micronanobubble Release Agent for Hot-Forging Die Cooling

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Solution Overview

Problem

Conventional release agents for hot-forging dies evaporate rapidly due to high temperatures, leading to insufficient cooling and non-uniform application, requiring excessive application and causing the Leidenfrost phenomenon, which reduces contact area and cooling efficiency.

Innovation Solution

Incorporating micronanobubbles into the release agent to enhance wettability and accelerate solvent vaporization, maintaining a sufficient and uniform release agent layer with improved cooling performance while minimizing application amount.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a conventional release agent is applied to the hot-forging die surface, then the die surface is cooled, but the release agent evaporates rapidly due to high temperature causing the Leidenfrost phenomenon which reduces contact area and cooling efficiency

Engineering Contradiction:

Improvedie surface temperatureVSAvoidcooling efficiency

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent changes the physical parameters of the release agent by incorporating micronanobubbles (0.1-200 μm) to modify its evaporation characteristics. The micronanobubbles create numerous nucleation sites that promote controlled bubble formation and enhance heat transfer, preventing the Leidenfrost phenomenon while improving cooling efficiency. This parameter change transforms the release agent from a conventional liquid into a microbubble-containing solution with superior thermal management properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transition mechanisms by incorporating micronanobubbles that undergo controlled vaporization. The micronanobubbles act as nucleation sites for phase change, allowing the release agent to transition from liquid to vapor in a controlled manner that maintains contact with the die surface. This controlled phase transition prevents rapid evaporation and the Leidenfrost effect, ensuring sustained cooling efficiency.

Inventive Principle:

Principle #36Phase transitions

2Temperature

If mass application of release agent is used to compensate for insufficient cooling capability, then cooling effect is improved, but uniform graphite membrane formation becomes difficult and application amount increases

Engineering Contradiction:

Improvedie cooling effectVSAvoidrelease agent application amount

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

The patent changes the concentration and distribution parameters of the release agent by incorporating micronanobubbles at controlled volumes (0.1-10 vol%). This parameter modification enables the release agent to achieve sufficient cooling capability with reduced application amounts, as the micronanobubbles enhance heat transfer efficiency and prevent rapid evaporation, eliminating the need for mass application.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The micronanobubbles serve as numerous distributed copying units of cooling function across the release agent droplet. Instead of relying on large quantities of conventional release agent, the patent uses multiple micronanobubble units that each contribute to heat transfer, achieving uniform cooling and graphite membrane formation with reduced overall material consumption.

Inventive Principle:

Principle #26Copying

3Temperature

If conventional release agent droplet contacts the hot die surface, then cooling occurs, but rapid evaporation causes updraft of steam reducing contact area and cooling capability

Engineering Contradiction:

Improvedie surface coolingVSAvoidcontact area of droplet

Core Design Contradiction:

TemperatureVSArea of stationary object

Solution Approach 1:

The patent changes the physical state parameters of the release agent by incorporating micronanobubbles, which modify the droplet's interaction with the hot surface. The micronanobubbles create controlled nucleation sites that prevent rapid vaporization and the formation of steam updrafts. This parameter change maintains larger contact area between the release agent and die surface, ensuring effective cooling.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful rapid evaporation effect into a beneficial controlled vaporization process. The micronanobubbles, which could be seen as potential defects, are instead utilized as advantageous nucleation sites that promote controlled bubble formation and enhance heat transfer. This transforms the evaporation harm into a benefit by maintaining droplet contact and improving cooling efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 release agent with micronanobubbles achieves efficient cooling of the die surface, forming a uniform and thick release agent layer that enhances lubricity and releasability, reducing the need for excessive application and preventing the Leidenfrost phenomenon.

Implementation Method 1

accelerating vaporization of a solvent component of the release agent from the contact face. The vaporization of the solvent component of the release agent is also accelerated from micronanobubbles present in the droplet of the release agent as cores

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

accelerating vaporization of a solvent component of the release agent from the contact face... It is therefore possible to cool the die in a short time

Methodology Applied

Scientific EffectEvaporative cooling: Evaporation