Drill Pad Orientation for Chatter Suppression
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Solution Overview
Problem
Existing drills for machining cast holes suffer from chatter vibration, which limits the improvement in position accuracy and surface working accuracy of the holes.
Innovation Solution
A drill design featuring a flute with two lands and two grooves, a linear chisel edge, and a pad arranged perpendicular to the thinning face, with specific dimensions and angles to reduce cutting resistance and suppress chatter vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pad portion is added to the drill to enhance straightness, then the straightness of the drill is improved, but chatter vibration occurs and position accuracy does not increase as expected
Solution Approach 1:
The patent changes the geometric parameters of the pad portion, specifically arranging it on a line perpendicular to the thinning face and optimizing its width relative to the margin portion. This parameter optimization allows the pad to effectively receive cutting resistance forces and suppress chatter vibration, thereby achieving both straightness and position accuracy improvements
2Force
If the margin portion width is reduced to reduce cutting resistance, then cutting resistance is reduced, but tool bending strength may be compromised
Solution Approach 1:
The patent optimizes the width parameter of the margin portion and its relationship with the pad portion width. By setting the margin portion width smaller than the pad width and arranging the pad perpendicular to the thinning face, the design reduces cutting resistance through minimized radial friction while the pad configuration maintains tool strength by effectively managing cutting forces
Data Source
AI summary
A blade section has two lands and two flutes in an alternating manner and also has a linear chisel edge. The lands are each provided with: a margin section that is continuous with a cutting blade; a clearance section that is continuous with the margin section and that has a smaller diameter than the margin section; and a pad that is continuous with the clearance section and that has the same width as the width of the margin section.