Continuous-Twist Rotary Cutting Tool for Lower Burr Formation
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Solution Overview
Problem
Existing rotary cutting tools with cutting edges divided into multiple parts at the effective cutting length region experience high cutting resistance and difficulty in suppressing burr formation on workpieces due to intermittent biting during cutting.
Innovation Solution
A rotary cutting tool design featuring a main body with a first cutting edge having a positive twist angle and a second cutting edge with a negative twist angle, both extending continuously from the tip end to the shank, reducing cutting resistance and burr occurrence by ensuring smooth cutting without intermittent bites, while also incorporating a diamond or diamond-like carbon coating for improved wear resistance and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting edges are divided into multiple parts at the effective cutting length region, then the cutting tool can be manufactured with specific structural requirements, but cutting resistance increases and burr formation occurs due to intermittent biting
Solution Approach 1:
The patent applies continuity of useful action by making each cutting edge extend continuously from the tip end to the shank along the effective cutting length region. This continuous structure eliminates intermittent biting, ensuring smooth cutting action that reduces cutting resistance and prevents burr formation on the workpiece surface.
Solution Approach 2:
The patent applies segmentation by providing multiple cutting edges (first and second cutting edges) separated from each other on the main body, with each cutting edge having different twist angles. This segmentation allows each cutting edge to be optimized independently while maintaining continuous contact with the workpiece, resolving the contradiction between manufacturability and cutting performance.
2Device complexity
If cutting edges are divided into multiple parts, then the cutting tool structure can be adjusted, but burr formation on the workpiece increases due to intermittent cutting action
Solution Approach 1:
The patent ensures continuous cutting action by extending each cutting edge continuously from the tip end to the shank, eliminating the intermittent biting that causes burr formation. This continuous engagement of cutting edges with the workpiece maintains smooth surface quality while allowing flexible cutting edge configuration.
Solution Approach 2:
The patent applies asymmetry by assigning different twist angles to the first and second cutting edges, with the first cutting edge having a positive twist angle and the second cutting edge having a negative twist angle. This asymmetric configuration optimizes each cutting edge's performance while maintaining overall device functionality and workpiece quality.
3Force
If continuous cutting edges are used from tip end to shank, then cutting resistance is reduced and burr formation is suppressed, but the tool requires specific structural design
Solution Approach 1:
The patent implements continuous cutting edges extending from the tip end to the shank, which eliminates intermittent biting and reduces cutting resistance. The main body structure is designed to support this continuous configuration, with cutting edges that maintain constant engagement with the workpiece throughout the effective cutting length region.
Solution Approach 2:
The patent applies local quality by providing different twist angles at different locations on the main body. The first cutting edge has a positive twist angle while the second cutting edge has a negative twist angle, allowing each region to be optimized for its specific cutting function while maintaining the overall continuous structure.
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 continuous cutting edges reduce cutting resistance, suppress burr formation, enhance chip discharging efficiency, and prolong tool life by maintaining sharpness and improving surface texture, with the coating further contributing to wear resistance and heat dissipation.
Implementation Method 1
incorporating a diamond or diamond-like carbon coating for improved wear resistance and heat dissipation
Implementation Method 2
incorporating a diamond or diamond-like carbon coating for improved wear resistance and heat dissipation
Data Source
AI summary
A rotary cutting tool includes a main body and a shank. The main body has a tip end. The shank is continuous with the main body on the side opposite to the tip end. The main body is provided with a first cutting edge having a positive twist angle, and a second cutting edge having a negative twist angle and separated from the first cutting edge. Each of the first cutting edge and the second cutting edge extends continuously from the tip end to the shank.