Vortex Tube Tool Holder Cooling for Dry Machining

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Solution Overview

Problem

Existing cooling methods, such as dry air streams, are insufficient for materials with low specific heat and poor heat conductivity like composite materials, hard metals, and titanium alloys during dry machining, as they fail to adequately control temperature levels and prevent damage or jamming.

Innovation Solution

A tool holder equipped with a vortex tube device that produces cold air by injecting compressed air tangentially to create a fast vortex flow, which is then cooled and distributed internally and externally through channels to effectively lower tool and swarf temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a stream of dry air is used to cool the tool, then the cooling system is simple, but the temperature reduction is insufficient for materials with low specific heat and poor heat conductivity

Engineering Contradiction:

Improvecooling system structureVSAvoidtool temperature

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The patent introduces vortex tubes as an intermediary device between the compressed air source and the tool. The vortex tubes convert compressed air into extremely cold air (up to -40°C) through the Ranque-Hilsch effect, acting as a thermal mediator that amplifies the cooling capability of the air stream without adding complex mechanical cooling systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the temperature parameter of the cooling air from ambient temperature (dry air stream) to sub-zero temperatures (vortex-cooled air). This parameter transformation is achieved through the vortex tube device, which converts isothermal compressed air into a temperature-stratified flow with extremely cold output, thereby dramatically improving cooling effectiveness.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If oil or oil-air mixture is used for cooling, then temperature control improves, but the risk of inflammability and environmental pollution increases

Engineering Contradiction:

Improvetemperature controlVSAvoidinflammability risk

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces expensive and hazardous cooling media (oil, oil-air mixtures) with inexpensive, non-hazardous compressed air. The air is consumed in the process (disposable in the sense that it's a continuous flow resource), but it eliminates all risks associated with oil-based cooling systems, including inflammability, environmental pollution, and tool contamination.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention uses compressed air as an inert, non-flammable cooling medium. Unlike oil-based systems that present fire hazards, the air stream creates a safe, inert environment that eliminates inflammability risks while still providing effective cooling through the vortex tube-enhanced cold air flow.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Temperature

If the cooling power is increased to adequately cool the tool, then temperature control improves, but the device complexity increases

Engineering Contradiction:

Improvetemperature controlVSAvoidcooling device structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical cooling systems (such as refrigeration units, compressors, or liquid cooling circuits) with a purely pneumatic vortex tube device. The vortex tube has no moving parts and relies on fluid dynamics (the Ranque-Hilsch effect) to generate extreme temperature differences, thereby achieving high cooling power without mechanical complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention uses pneumatic principles to achieve cooling. The vortex tube device utilizes compressed air flow and vortex dynamics to generate extremely cold air through the Ranque-Hilsch effect. This pneumatic approach provides high cooling power while maintaining device simplicity, as it eliminates the need for mechanical refrigeration components.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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 solution provides a significant temperature difference of up to 70°C, reducing tool and swarf temperatures, preventing damage, and improving machining efficiency by reducing adhesion and optimizing cutting speeds, thus enhancing productivity in dry machining processes.

Implementation Method 1

the air injected tangentially into the tube creates an extremely fast vortex flow

Methodology Applied

Scientific EffectVortex flow: Vortex Ring

Implementation Method 2

The cold air is produced by vortex tubes, also called Ranque-Hilsch tubes, which are thermodynamic devices with no moving parts that produce cold air

Methodology Applied

Scientific EffectRanque-Hilsch effect: Ranque-Hilsch Effect

Data Source

PatentUS8876447B2Tool holder comprising a cooling means

Publication Date: 2014.11.04 EURON AERONAUTIC DEFENCE & SPACE

AI summary

A tool holder for a machining tool includes a cooling means for a compressed air blowing tool and a device for cooling air compressed by a vortex tube device. The tool holder is generally cylindrical and the vortex tube device advantageously includes a plurality of vortex tubes placed annularly around the axis of the cylinder and the cold air outputs of which are directed at the tool held by the tool holder.