Fan-Shaped Cutting Fluid Hole Drill Rigidity
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Solution Overview
Problem
Conventional drills with round cross-sectional cutting fluid supply holes do not provide sufficient cutting fluid supply near the cutting edge, leading to reduced durability and increased risk of chipping, breakage, and burning, and increasing the supply pressure requires additional equipment and reconstruction.
Innovation Solution
A drill with a cutting fluid supply hole having a fan-shaped cross section, defined by specific inner and outer cylindrical surfaces and angles, which increases the flow speed of cutting fluid without raising the supply pressure, thereby enhancing the supply amount without reducing the drill's rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross-sectional area of the cutting fluid supply hole is increased to enhance the supply amount of cutting fluid, then the supply amount of cutting fluid is improved, but the rigidity and strength of the drill are reduced making it easily broken
Solution Approach 1:
The cutting fluid supply hole is designed with an asymmetric fan-shaped cross-section rather than a conventional circular shape. This asymmetric geometry concentrates the cutting fluid flow toward the outer circumferential side where the cutting edge is located, maximizing the supply amount to the cutting point while maintaining sufficient material cross-section to preserve drill strength and rigidity.
Solution Approach 2:
The invention changes the cross-sectional geometry from a conventional circular shape to a fan-shaped shape with specific angular distribution. This dimensional change in the cross-sectional profile allows the cutting fluid to be directed more effectively toward the cutting edge while maintaining adequate structural integrity of the drill body.
2Quantity of substance
If the supply pressure of cutting fluid is increased to enhance the supply amount, then the supply amount of cutting fluid is improved, but additional equipment such as pump and tool chuck and equipment reconstruction are required
Solution Approach 1:
The fan-shaped cross-section design allows the drill to self-regulate and optimize cutting fluid delivery through its geometric configuration alone, without requiring external pressure increases or additional equipment. The shape itself serves the function of directing and optimizing fluid flow to the cutting edge.
Solution Approach 2:
The invention changes the geometric parameters of the cutting fluid supply hole (cross-sectional shape, angular distribution) rather than changing the pressure parameter. This parameter change in geometry achieves improved cutting fluid supply without requiring changes to the pressure system or additional equipment.
3Ease of manufacture
If a round cross-sectional shape is used for the cutting fluid supply hole, then the manufacturing is simple, but the supply amount of cutting fluid is not sufficient
Solution Approach 1:
The fan-shaped cross-section with its asymmetric geometry is designed to maximize cutting fluid delivery to the cutting edge. While more complex than a circular shape, it can be manufactured using standard drilling and shaping operations, achieving a balance between manufacturability and performance.
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 fan-shaped cutting fluid supply hole design increases the cutting fluid supply amount and maintains the drill's rigidity by utilizing centrifugal force, reducing the need for increased supply pressure and equipment modifications.
Implementation Method 1
the speed of the cutting fluid in the cutting fluid supply hole can be increased without raising the supply pressure of the cutting fluid
Data Source
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AI summary
Provided is a drill such that a sufficient amount of cutting liquid fed through a cutting liquid feeding hole is ensured without lowering the rigidity of the drill and without increasing the cutting liquid feeding pressure. The cutting liquid feeding hole (22), which is formed within a fluted portion (16), has a fan-shaped cross section which is enclosed by: a forward-side inner wall (FH) located forward relative to the direction of rotation (RT) of the drill (10) and along a radial direction thereof; a rearward-side inner wall (RH) located rearward relative to the direction of rotation (RT) of the drill (10) and along a radial direction thereof and facing the forward-side inner wall (FH) in a circumferential direction; an outer-circumference-side inner wall (OH) which is formed from a partial cylindrical surface centered on the central line (C) of the drill (10); and an inner-circumference-side inner wall (IH) which is formed from a partial cylindrical surface which is centered on the central line (C) of the drill (10) and has a curvature radius (R2) smaller than the curvature radius (R1) of the outer-circumference-side inner wall (OH), said inner-circumference-side inner wall (IH) facing the outer-circumference-side inner wall (OH) in a radial direction. Since the cutting liquid feeding hole (22) has the abovementioned fan-shaped cross section, sufficient web thickness can be ensured while the speed of the cutting liquid inside the cutting liquid feeding hole (22) can be increased without having to increase the cutting liquid feeding pressure, thereby increasing the amount of cutting liquid fed.