Textured Shrink-Fit Tool Holder for Heat Dissipation and Tool Retention
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Solution Overview
Problem
Conventional shrink-fit tool holders experience heat-related self-release issues due to high thermal conduction and low heat capacity of tool shanks, leading to slippage and reduced tool life, as heat is conducted to the holder faster than it can be removed by coolant.
Innovation Solution
A tool holder with a textured surface on the outer surface of the tool holding section, featuring grooves and notches to increase heat dissipation, and optionally embedded materials with higher Young's modulus or a black coating for enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant is sprayed on the tool during use to remove heat, then heat removal is improved, but heat from the cutting tool is conducted to the tool holder faster than it can be removed by the coolant
Solution Approach 1:
The patent adds a textured surface dimension to the tool holder's outer surface, transforming a smooth two-dimensional surface into a three-dimensional textured surface with increased surface area. This dimensional enhancement allows for greater heat dissipation capacity without changing the fundamental geometry of the tool holder body.
Solution Approach 2:
The patent changes the surface area parameter of the tool holder by applying a textured surface coating or treatment. This parameter modification increases the effective surface area for heat transfer, enabling more efficient thermal energy dissipation from the tool holder to the surrounding environment.
2Temperature
If the tool holder gets too hot, then heat dissipation is improved, but retaining bore expands and the cutting tool begins to slip or release
Solution Approach 1:
The patent converts the harmful effect of heat generation into a beneficial effect by designing the tool holder to actively utilize the heat for controlled expansion of the retaining bore. The thermal energy that would otherwise cause tool slippage is instead harnessed to maintain a friction-fit grip on the tool shank through controlled thermal expansion of the retaining bore material.
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 textured surface design increases the surface area for radiant and convective heat loss, preventing heat buildup and tool slippage, thereby improving tool retention and extending tool life.
Implementation Method 1
The textured surface design increases the surface area for radiant and convective heat loss
Implementation Method 2
The textured surface design increases the surface area for radiant and convective heat loss
Implementation Method 3
The thermal conduction of carbide, however, is very high while the heat capacity is very low. It is also true that the thermal conduction of carbide is much higher than water or the coolant. This causes heat from the cutting tool to be conducted to the tool holder faster than it can be removed by the coolant.
Implementation Method 4
The conventional shrink-fit tool holders utilize differences in thermal expansion coefficients between the tool-holding sections and the tool shanks.
Data Source
AI summary
A textured surface in an outer surface of a tool holding section of a tool holder for increasing a surface area of the outer surface for dissipating heat from the tool holding section. The textured surface can comprise grooves around the outer surface of the tool holding section with a height and a width. Notches can be provided in sides of the grooves to further increase the surface area of the outer surface for dissipating heat from the tool holding section.