CBN Cutting Insert Rake-Face Cooling for Hot Cutting Edges
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Solution Overview
Problem
The existing throwaway inserts are ineffective in cooling due to a coolant supply hole design that results in coolant being less likely to be ejected towards the cutting edge, leading to inadequate cooling.
Innovation Solution
A cutting insert with a coolant flow path inside the cutting edge portion, featuring a rake face inclined towards the bottom surface, a coolant ejection outlet on the rake face, and grooves to ensure consistent or decreasing distance from the coolant flow path to the bottom surface, facilitating effective coolant supply to the cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coolant supply hole is inclined so that the distance from the coolant supply hole to the bottom surface increases gradually toward its opening in the breaker surface, then the structural design is simplified, but the coolant is less likely to be ejected toward the cutting edge, resulting in inadequate cooling
Solution Approach 1:
Instead of inclining the coolant supply hole away from the bottom surface as in conventional designs, the present invention inclines the coolant supply hole toward the bottom surface so that the distance from the coolant supply hole to the bottom surface decreases gradually toward its opening in the breaker surface. This inverted approach directs coolant ejection toward the cutting edge, achieving effective cooling while maintaining manufacturing simplicity
2Device complexity
If coolant is not supplied effectively to the cutting edge, then the insert structure can be simpler, but the cutting edge cannot be cooled effectively, leading to heat generation and performance degradation
Solution Approach 1:
The coolant supply hole is designed with a specific inclination toward the bottom surface, creating a localized flow direction that concentrates coolant delivery at the cutting edge region. This local optimization ensures effective cooling where it is most needed without requiring complex overall insert structure modifications
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 enables efficient cooling of the cutting edge by ensuring coolant is supplied directly to the cutting edge, reducing heat generation and maintaining cutting edge performance during high-productivity processing of difficult-to-cut materials.
Implementation Method 1
A coolant flow path is formed in an inside of the cutting edge portion. The coolant flow path includes a coolant ejection outlet that is open in the rake face... This design enables efficient cooling of the cutting edge by ensuring coolant is supplied directly to the cutting edge, reducing heat generation
Data Source
AI summary
A cutting insert includes a bottom surface, a top surface opposite to the bottom surface, and a cutting edge portion. The cutting edge portion is located on the same side as the top surface. The cutting edge portion is formed of a sintered material including cubic boron nitride particles. A volume ratio of the cubic boron nitride particles to the sintered material is more than or equal to 50 percent. The cutting edge portion includes a rake face, a flank face contiguous to the rake face, and a cutting edge located along a ridgeline between the rake face and the flank face. The rake face is inclined toward the bottom surface so that a distance from the rake face to the bottom surface decreases gradually toward the cutting edge.