Drill Insert Coolant Curtain for Higher Penetration Rates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current drilling tools face challenges in achieving higher penetration rates due to undesirable heat, friction, and adhesion at the rake face, which are exacerbated by the increasing demand for faster drilling in high-production environments, despite the use of coolant, which often disrupts chip flow and does not effectively target the critical cutting zone.
Innovation Solution
A drill tool assembly with a holder and cutting insert featuring angled coolant channels and outlets that direct a curtain of coolant onto the rake face of the cutting edges, minimizing heat, friction, and adhesion, while maintaining effective chip evacuation and lubricity, thereby allowing for higher penetration rates and extended tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional coolant delivery methods are used in drilling tools, then coolant is applied to the cutting zone, but the coolant disrupts chip flow and does not effectively target the rake face, resulting in insufficient heat reduction and adhesion prevention
Solution Approach 1:
The coolant delivery system is designed with multiple outlets positioned at specific locations to deliver coolant locally to different areas of the rake face. The outlets are arranged to target the interface between the chip and rake face specifically, providing localized cooling where heat generation is most critical without disrupting overall chip flow patterns
Solution Approach 2:
The coolant acts as an intermediary substance that mediates between the cutting zone and the rake face. By positioning outlets to deliver coolant directly to the chip-rake face interface, the coolant serves as a thermal mediator that reduces heat transfer to the rake face while maintaining chip evacuation pathways
2Productivity
If drilling speed is increased to achieve higher penetration rates, then productivity improves, but heat, friction, and adhesion on the rake face increase, reducing tool life
Solution Approach 1:
Coolant is delivered to the rake face before excessive heat and adhesion can build up during high-speed drilling. The preliminary application of coolant at the chip-rake face interface prevents thermal accumulation and reduces friction before they can negatively impact tool life, enabling sustained high-speed operation
Solution Approach 2:
The coolant delivery system provides continuous cooling to the rake face throughout the drilling operation. Multiple outlets ensure uninterrupted coolant supply to the cutting zone, maintaining thermal management and reducing friction continuously even at elevated drilling speeds, thereby preserving tool life during extended high-productivity operations
3Ease of operation
If coolant is applied to the cutting zone, then lubricity is improved, but the coolant does not effectively reach the rake face interface, allowing heat and adhesion to accumulate
Solution Approach 1:
The coolant delivery system is segmented into multiple outlets positioned at different locations around the holder. This segmentation allows coolant to be delivered to multiple areas of the rake face simultaneously, ensuring comprehensive coverage of the chip-rake face interface and effective heat dissipation across the entire cutting zone
Solution Approach 2:
The coolant outlets are positioned in three-dimensional space to deliver coolant from multiple angles and directions to the rake face. This spatial arrangement ensures that coolant reaches the chip-rake face interface from optimal angles, improving penetration and effectiveness of cooling and lubrication at the critical 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
The targeted coolant delivery system enhances drilling performance by reducing heat and friction on the rake face, promoting superior chip evacuation and lubricity, enabling faster drilling operations with improved tool longevity.
Implementation Method 1
at least one coolant outlet directed at the sides of the insert at a position below the rake surfaces. The coolant outlet is configured to disperse coolant in a curtain across the entire rake face of each cutting edge
Implementation Method 2
Using coolant provides lubricity, heat dissipation from the tool
Implementation Method 3
Using coolant provides lubricity, heat dissipation from the tool
Data Source
AI summary
There is provided a drill tool assembly for drilling metallic or other materials, comprising a holder having a mounting slot in which a cutting insert is positioned, and a through tool coolant supply system. The drilling tool system allows for the application of coolant to the rake surfaces of the cutting insert in a manner which facilitates enabling higher penetration rates while maintaining integrity of the cutting edges of the cutting insert. The drilling tool system comprises a holder having a rotational axis and mounting slot. A cutting insert with sides positioned adjacent the side surfaces of the mounting slot and cutting edges extending from the rotational axis is mounted in the slot. The insert includes rake surfaces adjacent the cutting edges that are positioned above the mounting slot. At least one coolant channel is disposed with at least one coolant outlet directed at the sides of the insert at a position below the rake surfaces. The coolant outlet is configured to disperse coolant in a curtain across the entire rake face of each cutting edge.