Coolant Channel Cavity Geometry for Pulsed Metal Cutting Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing metal cutting tools face high heat loads due to inadequate coolant delivery systems, which shorten their lifespan and fail to effectively improve chip breaking performance.
Innovation Solution
A metal cutting tool with a coolant channel featuring a cavity and channels that generate a pulsed coolant flow through vortex ring formation, reducing heat load and enhancing chip breaking performance by directing high-pressure coolant via a specifically designed inlet and outlet geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure coolant is delivered through existing coolant channels, then coolant delivery capability is improved, but chip breaking performance and heat load reduction remain insufficient
Solution Approach 1:
The cavity geometry (with A3 > A2 > A1 and L > d2) creates periodic vortex ring formation and reflection, generating pulsed coolant flow that periodically impacts the chip formation zone. This periodic action enhances chip breaking performance compared to continuous flow, while maintaining effective heat load reduction through sustained coolant delivery.
Solution Approach 2:
The invention changes the flow regime parameter from continuous to pulsed through the specific cavity geometry. The cavity acts as a resonator that transforms steady high-pressure coolant flow into periodic pulsed flow, changing the temporal characteristics of coolant delivery to improve chip breaking while maintaining delivery capability.
2Temperature
If continuous coolant flow is used, then cooling capability is maintained, but chip breaking performance is inferior compared to pulsed flow
Solution Approach 1:
The cavity geometry transforms continuous coolant flow into periodic pulsed flow through vortex ring formation and reflection. The pulsed flow creates periodic high-velocity jets that effectively break chips, while the continuous supply of coolant through the channel maintains sustained cooling capability at the cutting edge.
Solution Approach 2:
The system transitions from static continuous flow to dynamic pulsed flow. The cavity introduces temporal dynamics through vortex formation and reflection, creating a time-varying flow pattern that enhances chip breaking performance while the overall cooling function remains continuous and sustained.
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 pulsed coolant flow improves chip breaking properties, reducing heat load on the cutting tool and extending its lifespan by creating a fluctuating pressure field that enhances coolant flow efficiency.
Implementation Method 1
a disturbance wave is generated since the coolant jet introduces an unstable shear layer in the boundary of the jet and causes vortex rings to form around the jet
Implementation Method 2
The vortex rings propagate through the cavity until they reach the second end surface where they are reflected back upstream the cavity where they interact with the unstable shear layer
Implementation Method 3
A fluctuating pressure field will be developed in the cavity resulting in that the velocity of the coolant jet exiting the cavity via the cavity outlet will vary periodically
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention is related to a metal cutting tool (100) comprising a coolant channel (402). The coolant channel (402) comprises an inlet channel (408), an outlet channel (410), and a cavity (412), wherein the cavity (412) comprises a first end surface (414), and a second end surface (416), wherein the cavity (412) has a central axis C extending from the first end surface (414) to the second end surface (416), wherein the first end surface (414) comprises a cavity inlet (420), and wherein the second end surface (416) comprises a cavity outlet (422), wherein the second end surface (416) has an area A3 as seen in a plane perpendicular to the central axis C. The axial distance between the cavity inlet (420) and the cavity outlet (422) is L. The cavity inlet (420) is defined by an inlet boundary B1 and has an area A1 as seen in a plane perpendicular to the central axis C, and the cavity outlet (422) is defined by an outlet boundary B2 and has an area A2 as seen in a plane perpendicular to the central axis C, wherein the longest distance between two points at a projection of the boundary B2 onto a plane perpendicular to the central axis C is d2, wherein A3 > A2, and wherein L > d2, wherein A2 > A1 and wherein a projection of the inlet boundary B1 onto the second end surface (416) lies completely within the outlet boundary B2 as seen in a plane perpendicular to the central axis C.