Tool Holder Cooling via Coanda-Effect Flow Amplifier
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Solution Overview
Problem
Current cooling methods, such as blowing dry air, are insufficient for materials with low specific heat and poor thermal conductivity like composites with organic matrices or hard metals during machining, leading to tool damage and chip packing issues due to inadequate temperature control.
Innovation Solution
A Coanda-effect flow amplifier device is integrated into a tool holder to generate a high-flow rate air flow around the tool, utilizing pressurized air and ambient air amplification, along with optional endothermic phase transformation fluids for enhanced cooling within the tool's lubrication channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dry air blowing is used for cooling, then the cooling system is simple, but the temperature reduction is insufficient for materials with low thermal conductivity
Solution Approach 1:
The patent introduces a Coanda effect nozzle as an intermediary device that redirects the cooling air flow to follow the tool surface contour, ensuring the cooling medium effectively contacts the tool surface and removes heat from hard-to-reach areas, thereby achieving sufficient temperature reduction without complicating the overall cooling system structure
Solution Approach 2:
The patent changes the flow direction and distribution parameters of the cooling air by using the Coanda effect, which causes the air jet to adhere to and follow the tool surface, thereby improving heat removal efficiency without requiring a more complex cooling system
2Temperature
If air flow rate is increased to improve cooling, then temperature control improves, but energy consumption increases
Solution Approach 1:
The patent changes the flow parameters by using the Coanda effect to redirect and concentrate the cooling air along the tool surface, improving thermal coupling between the cooling medium and tool, thereby achieving better temperature control with moderate air flow rates and reduced energy consumption
3Productivity
If cooling is not sufficient, then productivity increases due to higher cutting speeds, but tool damage and chip packing occur
Solution Approach 1:
The Coanda effect nozzle acts as an intermediary that ensures efficient heat removal from the tool surface, maintaining tool integrity at high cutting speeds and enabling sustained productivity without tool damage or chip packing issues
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
This solution effectively reduces tool temperatures by several hundred degrees, preventing damage and chip packing, while improving productivity by maintaining a cooler tool environment and preventing chip jamming, especially in dry machining processes.
Implementation Method 1
A Coanda-effect flow amplifier device is integrated into a tool holder to generate a high-flow rate air flow around the tool, utilizing pressurized air and ambient air amplification
Implementation Method 2
the fluid is a phase transformation fluid, the vaporization of which is endothermic, delivered in the tool's lubrication channels in liquid form and vaporizing in the tool's flutes at the tip of the tool
Data Source
AI summary
Device for cooling a rotating tool mounted on a machine, including elements for generating a continually renewed first flow of air, external to the tool and around the tool, at a high flow rate, produced via a Coanda-effect flow amplifier device realized in a housing fixed on the machine around the tool holder connected to a source of pressurized air.