Drill Insert Coolant Relief Channels for Heat and Adhesion
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Solution Overview
Problem
Existing drill inserts face issues with heat generation, friction, and material adhesion at the outside diameter during drilling, particularly when dealing with modern materials, which can lead to performance degradation and reduced tool life.
Innovation Solution
The design incorporates coolant supply channels at the outside diameter of the drill insert, allowing coolant to flow between the leading and trailing edges of the interface, effectively reducing heat and friction while preventing material adhesion by dispersing coolant across the interface area, thereby enhancing drilling performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If coolant is supplied to the forward end of the holder, then chip evacuation and heat dissipation are improved, but the outside diameter interface areas remain susceptible to heat generation and material adhesion
Solution Approach 1:
The patent applies local quality by providing coolant supply channels specifically at the outside diameter interface areas where heat generation and material adhesion occur. This targeted local coolant delivery addresses the specific thermal problem at the margin interfaces without requiring a complete redesign of the overall coolant system, thereby resolving the contradiction between general heat dissipation and localized heat generation at the outside diameter.
Solution Approach 2:
The coolant supply system is segmented into multiple channels distributed around the outside diameter of the drill insert. This segmentation allows coolant to be delivered to multiple specific locations simultaneously, ensuring comprehensive coverage of the interface areas prone to heat generation and material adhesion, thus resolving the contradiction effectively.
2Productivity
If drilling speed is increased for high production, then productivity is improved, but heat generation and material adhesion at the outside diameter are exacerbated
Solution Approach 1:
The patent implements preliminary action by supplying coolant to the outside diameter interface areas before material adhesion can occur. The coolant channels are positioned to deliver coolant to the margin interfaces at the onset of the drilling process, creating a protective lubricating film in advance that prevents material buildup even at high drilling speeds, thus resolving the contradiction between productivity and material adhesion.
Solution Approach 2:
The patent converts the harmful effect of high-speed drilling (increased heat and friction at interfaces) into a benefit by using the generated heat and pressure to drive coolant flow more effectively through the channels. The high-speed drilling conditions that would normally exacerbate material adhesion instead enhance coolant delivery to the critical interface areas, preventing adhesion and enabling sustained high-speed operation.
3Temperature
If coolant channels are added to the drill insert, then heat and friction at the interface are reduced, but device complexity increases
Solution Approach 1:
The drill insert design integrates coolant supply channels into the existing margin structure, making the margin serve multiple functions: structural support, guiding the drill, and delivering coolant to the interface areas. This multi-functionality approach reduces the need for separate coolant delivery components, thereby minimizing the increase in device complexity while still achieving effective temperature control at the outside diameter interface.
Solution Approach 2:
The patent merges the coolant supply function with the existing drill insert geometry by forming channels within the margin material itself. This integration combines the structural and cooling functions into a single unified component, avoiding the need for separate coolant delivery mechanisms and thus limiting the increase in device complexity while effectively reducing temperature at the interface.
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 configuration enables higher penetration rates and operating speeds while maintaining tool integrity by minimizing heat, friction, and adhesion, thus improving drilling efficiency and extending tool life.
Implementation Method 1
coolant fluid supplied to the forward end of the holder via a through tool coolant supply
Implementation Method 2
heat dissipation from the tool
Implementation Method 3
coolant provides lubricity
Implementation Method 4
The flutes evacuate chips after being formed at the cutting edges
Data Source
AI summary
There is provided a drill insert for drilling metallic or other materials, comprising a drill insert body with first and second lands at the outside diameter of the body that interface with the wall of a drilled hole. There is provided a coolant relief arrangement at the outside diameter of the drill insert by a plurality of coolant supply channels extending between the leading edge and trailing edge of the interface, to provide coolant relief to the outside diameter of the drill insert at the interface with the drilled hole. The drill inserts of the invention provide reduced friction and heat generation while maintaining high stability, and operate to prevent accumulation of materials on surfaces of the drill inserts at the outside diameter of the drill insert. This enables higher penetration rates and operating speeds while maintaining integrity of the drill inserts.