Cutting Tool Coolant Hole Positioning for Inner Surface Machining
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Solution Overview
Problem
Existing cutting tools for machining inner surfaces of holes face challenges in providing sufficient coolant supply and maintaining insert stability, leading to inadequate cooling and lubrication, which results in increased cutting resistance and reduced tool life.
Innovation Solution
The cutting tool features a coolant hole positioned apart from the cutting edge, facing a direction different from the cutting edge's protruding direction, allowing for reliable coolant supply through centrifugal retention within an annular groove, thereby preventing coolant scattering and heating, and ensuring sufficient lubrication without compromising tool rigidity or insert stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the groove is formed on the mounting surface of the support portion, then the coolant can be flushed out through the flushing hole, but the width of the groove is limited by the mounting surface dimension, making it difficult to supply sufficient coolant quantity
Solution Approach 1:
The groove is repositioned from the mounting surface to the inner circumferential surface of the hole being machined. This dimensional relocation allows the groove to be formed independently of the mounting surface dimensions, enabling increased groove width and improved coolant supply capacity without compromising insert mounting stability.
2Quantity of substance
If the groove is formed on the mounting surface, then coolant can be supplied, but the seating surface area of the insert is reduced, affecting seating stability
Solution Approach 1:
The functions of coolant supply and insert mounting are separated into different locations: the groove for coolant supply is formed on the inner circumferential surface of the hole, while the mounting surface remains intact on the support portion. This segmentation allows both functions to operate optimally without interfering with each other, maintaining insert seating stability while ensuring adequate coolant supply.
3Temperature
If coolant is supplied directly below the flank continuing to the cutting edge, then coolant can reach the cut site, but the coolant makes approximately one round from the cutting edge, resulting in scattering and heating that deteriorates cooling effect
Solution Approach 1:
The groove is positioned on the inner circumferential surface at a location that allows coolant to be supplied directly to the cut site before the workpiece rotation causes scattering. This preliminary positioning ensures coolant reaches the cutting zone at the optimal moment, maximizing cooling efficiency while minimizing the distance coolant travels and reducing heating losses.
4Quantity of substance
If the flushing hole is made larger to supply more coolant, then coolant quantity increases, but it exceeds the mounting surface or seating surface dimension
Solution Approach 1:
The groove is relocated from the mounting surface to the inner circumferential surface of the hole, allowing the groove width to be increased beyond the constraints of the mounting surface dimensions. This dimensional relocation enables larger flushing holes and greater coolant supply capacity without compromising the integrity or size of the insert mounting area.
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 effectively reduces cutting resistance, extends the life of the cutting edge, and provides stable and smooth machining by ensuring a consistent coolant supply to the cutting site.
Implementation Method 1
a coolant is flushed out toward the axially orthogonal plane to retain the coolant inside the groove by the centrifugal force acting on a workpiece
Implementation Method 2
cooling and lubricating a cutting edge of the insert and a cut site
Implementation Method 3
cooling and lubricating a cutting edge of the insert and a cut site
Data Source
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AI summary
The cutting tool for machining an inner surface of a hole is provided. The cutting tool includes a cutting tool main body extending in the shape of a shaft, a cutting edge portion mounted on a head portion of the cutting tool main body so as to radially-outwardly protrude with respect to the center axis of the cutting tool main body, and a coolant hole formed at the cutting tool main body so as to have an opening at a position apart from the cutting edge portion on a circumferential surface of the head portion of the cutting tool main body, thereby flushing out a coolant from the opening to an axially orthogonal plane orthogonal to the center axis and also along a protruding direction at which the cutting edge portion protrudes. The opening of the coolant hole faces a direction different from the protruding direction of the cutting edge portion in the radial direction with respect to the center axis.