Drill Head Blade Edge Inversion for Deep Hole Accuracy
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Solution Overview
Problem
Conventional drill heads for deep-hole drilling suffer from reduced accuracy and hole straightness due to the radial force of the central cutting blade acting outward, causing the diameter of the cutting hole to become unexpectedly large.
Innovation Solution
The drill head design features cutting blades with blade edges inclined upward toward the central axis, with the central cutting blade's edge formed linearly upward from the proximal end to a point before the central axis and rounded at the distal end, ensuring radial forces act inward, preventing thrust resistance and allowing precise cutting to the central portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade edge of the central cutting blade is formed linearly inclined downward from the distal end toward the central axis, then the cutting blade can reach the central portion of the work material, but the radial force acts outward causing hole diameter to become unexpectedly large and drilling accuracy to deteriorate
Solution Approach 1:
The blade edge inclination is inverted from the conventional downward slope to an upward slope toward the central axis. This inversion changes the direction of radial force from outward to inward, allowing the cutting blade to reach the central portion while maintaining hole diameter control and drilling accuracy through the inward-acting radial force.
2Ease of operation
If the blade point portion passes through the central axis to cut the central portion, then cutting to the center is achieved, but thrust resistance is loaded on the blade point portion where cutting force is not applied
Solution Approach 1:
Instead of having the blade point pass through the central axis with downward inclination, the blade edge is inverted to incline upward toward the central axis. This inversion ensures that cutting force is properly applied along the blade edge while preventing thrust resistance from loading the blade point portion, as the upward inclination directs forces away from the blade tip.
3Strength
If the radial force of the central cutting blade acts outward, then the blade can be pressed against the work material, but the diameter of the cutting hole becomes unexpectedly large
Solution Approach 1:
The blade edge inclination is inverted from downward to upward toward the central axis. This inversion reverses the direction of radial force from outward to inward, allowing the central cutting blade to press against the work material with sufficient force while maintaining precise control of the cutting hole diameter through the inward-acting radial force.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
Provided is a drill head for deep-hole drilling improved in hole drilling accuracy and straightness by making a radial force of the central cutting blade act radially inward toward the central axis as well as other radial forces. A drill head for deep-hole drilling including a plurality of cutting blades 6A to 6C provided along a head radial direction from the central axis G side to the outer circumferential side of a distal end portion of a head main body 3, wherein blade edges 10, 20, and 30 of all the cutting blades 6A to 6C are provided so as to be inclined upward toward the central axis G, the blade edge 10 of the central cutting blade is formed inclined upward linearly from its proximal end portion 10o side to a point 21 slightly before a point 22 on the central axis G, and is rounded at a blade edge distal end portion 25 side extending downward beyond the point 22 on the central axis G from the point 21 slightly before the point 22.