Milling Cutter Flute Geometry for Stable Chip Discharge
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Solution Overview
Problem
Existing cutting tools face challenges in efficiently managing chip discharge during milling processes, leading to potential damage to the inner wall of machined holes and reduced durability due to inadequate chip flow and discharge mechanisms.
Innovation Solution
A cutting tool design featuring a main body with a bar shape, including first and second cutting edges, flutes, and holes of specific shapes and orientations to facilitate efficient chip flow and discharge, with the second cutting edge located closer to the outer periphery to divide chips shorter and the first flute with a circular hole to stabilize long chip flow, enhancing durability and chip discharge performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chip discharge holes are used in cutting tools, then the structure is simple, but chip flow is inadequate leading to chip damage and reduced durability
Solution Approach 1:
The chip discharge hole is divided into multiple sections along the flute: a first section with a larger cross-sectional area near the cutting edge, and a second section with a smaller cross-sectional area toward the discharge end. This segmentation allows chips to be initially contained and guided in the larger first section, then smoothly transition to the smaller second section for controlled discharge, preventing chip clogging and wall damage while maintaining structural feasibility
Solution Approach 2:
Different sections of the flute have different cross-sectional areas tailored to local requirements: the first section near the cutting edge has a larger area to accommodate and guide freshly formed chips, while the second section has a smaller area optimized for chip discharge. This local differentiation optimizes chip flow characteristics at each location without requiring complete structural redesign
2Object-affected harmful factors
If cutting edges are positioned conventionally, then the design is straightforward, but chip division is insufficient causing long chips to damage machined hole walls
Solution Approach 1:
The cutting tool incorporates multiple cutting edges (first, second, and third cutting edges) positioned at different locations and orientations. The first and second cutting edges work together to initially divide chips, while the third cutting edge further segments the chips. This multi-stage segmentation of chips prevents them from forming long continuous strands that could damage the machined hole walls
Solution Approach 2:
The cutting edges are positioned and oriented to perform preliminary chip division before chips enter the flute. The first and second cutting edges create initial chip segments, and the third cutting edge further divides them, preparing chips for smooth flow through the flute sections and preventing harmful chip behavior during discharge
Data Source
AI summary
A cutting tool may include a main body extended from a first end to a second end. The main body may be rotatable around a rotation axis. The main body may include a first cutting edge, a second cutting edge, a first flute and a second flute. The first flute may be extended from the first cutting edge toward the second end. The second flute may be extended from the second cutting edge toward the second end. The first flute may include a first hole located in the main body. The second flute may include a second hole located in the main body. The first hole may have a circular shape and the second hole may have a long narrow shape in a circumferential direction of the rotation axis in a cross section orthogonal to the rotation axis.