Tool Holder Longitudinal Grooves for Coolant Delivery
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Solution Overview
Problem
Existing tool holders with coolant and lubricant channels suffer from reduced rigidity and strength, especially in smaller diameters, leading to potential breakage and costly production due to the need for angled bores and stress cracks during hardening.
Innovation Solution
The tool holder features longitudinal grooves on the holding pin for coolant and lubricant flow, which are easier to produce and do not reduce the holding pin's cross-section, along with an annular groove for distribution and a centering ridge for sealing, and an optional intermediate sleeve for improved flow guidance and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If angled bores are introduced into the holding pin to produce coolant channels, then coolant can be delivered to cutting edges, but production cost increases and manufacturing complexity increases
Solution Approach 1:
The coolant delivery system is segmented into multiple independent longitudinal grooves on the holding pin outer circumference, each groove serving as a separate coolant pathway. This segmentation allows simpler manufacturing of each groove compared to complex angled bores, while maintaining reliable coolant delivery to multiple cutting edges simultaneously
Solution Approach 2:
The coolant channels are moved from the internal bore structure (3D angled bores) to the external surface (2D longitudinal grooves). This dimensional change simplifies manufacturing as grooves can be formed by conventional machining or forming processes on the outer circumference, avoiding the complexity of drilling and tapping angled holes through the pin material
2Reliability
If angled bores are introduced into the holding pin to produce coolant channels, then coolant can be delivered to cutting edges, but manufacturing complexity increases
Solution Approach 1:
The coolant delivery function is segmented into multiple independent longitudinal grooves along the holding pin circumference. Each groove is a simple linear feature that can be manufactured independently, reducing overall manufacturing complexity compared to interconnected angled bores
Solution Approach 2:
Coolant channels are relocated from internal 3D angled bores to external 2D longitudinal grooves on the pin surface. This allows use of simpler manufacturing processes such as groove forming, milling, or grinding along the longitudinal axis, eliminating the need for complex angled drilling and tapping operations
3Reliability
If coolant channels are formed in the holding pin, then cooling of cutting edges is enabled, but rigidity and strength are reduced
Solution Approach 1:
The coolant delivery system is divided into multiple narrow longitudinal grooves distributed around the pin circumference rather than one or two large internal bores. This segmentation removes minimal material from each groove location, preserving the overall structural integrity and strength of the holding pin while providing adequate coolant flow paths
Solution Approach 2:
Coolant channels are positioned on the external surface as longitudinal grooves rather than being excavated as internal bores through the pin material. This approach removes significantly less material from the critical load-bearing sections of the pin, maintaining rigidity and strength while still enabling effective coolant delivery to cutting edges
4Reliability
If coolant channels are formed in the holding pin, then cooling of cutting edges is enabled, but production cost increases
Solution Approach 1:
The coolant delivery system uses multiple simple longitudinal grooves that can be formed using conventional machining or forming processes, reducing production cost compared to complex internal angled bores that require multiple drilling, tapping, and hardening operations
Solution Approach 2:
Coolant channels are formed as external longitudinal grooves on the pin surface rather than internal angled bores. This allows use of simpler, more cost-effective manufacturing processes such as longitudinal grooving, slotting, or forming operations that are standard in metalworking, eliminating the need for expensive angled drilling and post-hardening treatments
5Strength
If hardening is applied to the holding pin, then strength is improved, but stress cracks form in the coolant bore area
Solution Approach 1:
Coolant channels are positioned on the external surface as longitudinal grooves rather than internal bores. The wall thickness in the groove areas remains sufficient to prevent stress crack formation during hardening, as the grooves do not create thin-walled sections vulnerable to cracking under thermal stress
Solution Approach 2:
The coolant delivery system uses distributed longitudinal grooves that remove minimal material from any single location. This segmentation maintains adequate material thickness and structural continuity throughout the pin, allowing uniform hardening without creating stress concentration points that would lead to cracks
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 design enhances the tool holder's strength and production efficiency while ensuring reliable cooling and lubrication of cutting edges without compromising the holding pin's integrity, reducing production costs and preventing coolant escape.
Implementation Method 1
at least one longitudinal groove for conducting the coolant and/or lubricant in the longitudinal direction of the holding pin to the front side thereof is formed on the outer circumference of the holding pin
Implementation Method 2
This centering ridge is designed to cooperate in a force-fitting sealing manner with the rotary tool, so that passage of the coolant and/or lubricant at the centering ridge is suppressed
Implementation Method 3
The intermediate sleeve can preferably be sealingly connected in a force-fitting manner to the holding pin so that the coolant and/or lubricant is always conducted to the end face of the holding pin
Data Source
AI summary
A tool holder has a main body and a holding pin onto which a rotary tool having a corresponding holding bore can be placed. At least one channel for transporting coolant or lubricant, the channel leading to the outer circumference of the holding pin, is arranged in the tool holder. In order to enable cooling of the cutting edges of the rotary tool without great production complexity, at least one longitudinal groove for conducting the coolant or lubricant in a longitudinal direction of the holding pin is arranged on the outer circumference of the holding pin.