Drill Honing Surface Geometry for Rigidity and Chip Discharge
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Solution Overview
Problem
Existing drills experience damage due to chip collisions at the boundary portions between the flank face and flutes, leading to reduced rigidity and impaired machining accuracy, and excessive honing worsens this issue while deteriorating chip discharging properties.
Innovation Solution
The drill design incorporates honing surfaces with specific width variations to minimize damage risk and maintain rigidity, featuring increased widths in certain portions of the honing surfaces to enhance chip discharge without reducing the drill's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessive honing is performed on the boundary portion between the flank face and flute, then stress concentration is suppressed and chip discharging property is enhanced, but the drill rigidity is reduced and machining accuracy deteriorates
Solution Approach 1:
The honing surface is designed with non-uniform width where the width in the rotation direction varies along the extension direction. Specifically, the honing surface has a greater width at the upstream end compared to the downstream end, creating local quality variation that optimizes both stress distribution and rigidity maintenance in different zones of the boundary portion.
Solution Approach 2:
The invention changes the geometric parameter of the honing surface by controlling its width in the rotation direction to be non-uniform along its extension. This parameter variation allows the honing surface to provide adequate stress relief at the upstream end while maintaining sufficient structural rigidity at the downstream end, thus resolving the contradiction between stress concentration suppression and machining accuracy.
2Productivity
If the width of honing surface is increased to improve chip discharge, then chip discharging property is enhanced, but the structural integrity and rigidity of the drill are reduced
Solution Approach 1:
The honing surface width is designed to vary locally along its extension direction, with the upstream end having greater width for effective chip discharge and the downstream end having reduced width to maintain structural integrity. This local quality differentiation allows the system to achieve both good chip discharging property and sufficient drill rigidity simultaneously.
Data Source
AI summary
To provide a drill having high rigidity and excellent chip discharging property while reducing the occurrence of damage on a front end side. A drill according to one aspect of the present disclosure includes a body extending along a rotation axis. The body has a cutting edge, a thinning flute, a discharge flute, a front end surface, a first honing surface, and a second honing surface connected to the first honing surface. The first honing surface includes a first portion that is connected to the second honing surface and that has a width that increases toward the second honing surface in a front end view. The second honing surface includes a second portion that is connected to the first honing surface and that has a width that increases toward the first honing surface in a front end view.