Drill Bit Point Thinning for Chip Formation and Chisel Edge Strength
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Solution Overview
Problem
Conventional drill bits experience excessive energy expenditure and wear due to the chisel edge, which is not effective in cutting but displaces material, leading to suboptimal chip formation and tool wear.
Innovation Solution
A method for forming an improved point thinning on the cutting tool using a grinding wheel to taper the chisel edge, creating a wider point thinning towards the rear and a narrower one towards the front, optimizing chip formation and reducing tool wear by providing an enlarged space for chip formation while maintaining a robust chisel edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chisel edge is tapered to form point thinning, then chip formation is improved, but the chisel edge becomes too thin and loses robustness
Solution Approach 1:
The patent applies local quality by creating a point thinning with non-uniform width distribution: the point thinning is narrower at the front end (tool tip) and wider at the rear end. This local variation in geometry allows the front region to maintain robustness for structural support while the rear region provides sufficient space for chip formation, thereby resolving the contradiction between chip formation quality and chisel edge robustness.
2Strength
If the chisel edge is made wider to maintain robustness, then tool strength is improved, but chip formation space is reduced
Solution Approach 1:
The patent resolves the contradiction by transitioning from a uniform two-dimensional cross-section to a three-dimensional varied geometry. The point thinning width varies along the longitudinal axis of the drill bit, creating a tapered structure where the width transitions from narrow at the front to wide at the rear. This dimensional variation allows simultaneous optimization of both robustness (at the narrow front) and chip formation space (at the wide rear).
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 method enhances chip formation and reduces tool wear by allowing a larger chip formation area towards the rear and preventing excessive tapering of the chisel edge, resulting in a more robust cutting tool with improved operational efficiency.
Implementation Method 1
The point thinning is ground at the tool tip (6) with a grinding tool (18). The grinding tool is in particular a grinding wheel which rotates about an axis of rotation and is brought up to the tool tip in such a way that material is removed there.
Data Source
AI summary
A method for producing a cutting tool, in particular a drill bit, is specified wherein the cutting tool has a front end (F) at the front and a rear end (R) toward the rear, wherein a tool tip is formed on the front end (F), a point thinning is ground at the tool tip with a grinding tool, the point thinning being ground to be narrower toward the front than toward the rear. The point thinning is ground with a constant point thinning angle (AW). Furthermore, a corresponding cutting tool is specified.