Cutting Insert Coolant Delivery via Rake Face Channel
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Solution Overview
Problem
Conventional metal cutting systems are ineffective in delivering coolant close enough to the tool-workpiece interface, leading to reduced cutting insert life and increased operating costs due to inadequate cooling, with existing solutions being either costly or limited in effectiveness.
Innovation Solution
A tool holder assembly with a recess for the cutting insert, a shim with a cooling channel, and a top piece with a frusto-conical depression to create a fluid-tight seal, allowing coolant to be delivered from an angle below the rake face, impinging the chip underside and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If coolant is delivered through nozzles positioned 1-12 inches away from the cutting edge, then the coolant delivery system is simple, but the cooling effectiveness is insufficient due to excessive distance from the tool-chip interface
Solution Approach 1:
The patent introduces a third dimension by positioning coolant delivery through the thickness of the insert holder, delivering coolant from the rear face through bores that exit at the tool-chip interface. This eliminates the horizontal distance problem of traditional nozzles by approaching the cutting edge from a different spatial dimension (through the holder thickness rather than from a distance along the cutting path).
Solution Approach 2:
The insert holder acts as an intermediary structure that incorporates coolant delivery bores within its body. Instead of using external nozzles positioned at a distance, the holder itself becomes the delivery mechanism, with bores positioned to discharge coolant directly at the tool-chip interface, mediating between the coolant source and the cutting edge.
2Temperature
If high pressure and high volume coolant is directed at the cutting edge, then cooling effectiveness improves, but the cost and complexity of the coolant system increases
Solution Approach 1:
The coolant delivery is segmented into multiple separate bores positioned at different locations and angles within the insert holder. Each bore delivers coolant to a specific aspect of the tool-chip interface, allowing distributed cooling rather than requiring a single high-volume delivery point. This segmentation enables effective cooling through multiple low-flow channels rather than one high-flow channel.
3Temperature
If grooves are designed between the insert and top plate to reduce coolant spray distance, then cooling effectiveness improves, but the design complexity and manufacturing difficulty increase
Solution Approach 1:
The insert holder serves multiple functions: it secures the insert, provides structural support, and delivers coolant through integrated bores. By combining the coolant delivery function within the existing holder structure rather than adding separate cooling components, the design achieves effective cooling without increasing overall manufacturing complexity. The same holder structure that secures the insert also serves as the coolant delivery system.
4Temperature
If liquid nitrogen is used as coolant delivered near the cutting edge, then cooling effectiveness is maximized, but the cost becomes prohibitive for most applications
Solution Approach 1:
The patent changes the parameters of conventional coolant delivery by positioning bores to discharge coolant at specific angles and locations at the tool-chip interface. By optimizing the delivery parameters (position, angle, distribution) rather than changing the coolant substance itself, the system achieves effective cooling with conventional, cost-effective coolants instead of requiring expensive liquid nitrogen.
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
Significantly improves the life of the cutting insert by delivering coolant efficiently to the flank and rake faces, effectively cooling the insert and removing chips, while maintaining a cost-effective design.
Implementation Method 1
The coolant serves not only to lower the temperature of the insert but also to remove the chip from the cutting area
Implementation Method 2
a frusto-conical depression in the center of the insert and an orifice aligned with the coolant passage of the tool holder; a rake face cooling channel spanning from the insert orifice to a discharge slot
Data Source
AI summary
A metal cutting system with a tool holder, a shim, an insert with a top depression, a top piece and a clamp. A rake face cooling channel for fluid delivery is formed between the top piece and the depression in the insert. A primary discharge slot at the end of the rake face cooling channel delivers fluid from below the cutting edge of the insert. A second cooling channel for delivery of fluid to the flank face is formed between the insert and the shim or is formed between the shim and the tool holder with a portion of the cooling channel passing through the shim.