End Mill Dual-Flute Design for Chip Discharge and Rigidity
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Solution Overview
Problem
End mills face challenges in chip discharge during grooving and shouldering processes, with chip clogging occurring in grooving due to deep chip discharge flutes, which reduces rigidity and machining accuracy, especially under orthogonal resistance in shouldering.
Innovation Solution
The end mill design features a bar-shaped body with a gash, a first flute of greater depth, and a second flute of lesser depth, spirally extending from the gash, allowing for improved chip discharge and maintaining rigidity by varying flute depths and angles to suit both processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chip discharge flute is made deeper to improve chip discharge performance, then chip discharge performance is improved, but the core thickness of the end mill body decreases and rigidity is lowered
Solution Approach 1:
The chip discharge flute is divided into two distinct flutes with different depths: a first flute with greater depth for effective chip discharge, and a second flute with lesser depth for maintaining rigidity. This segmentation allows each flute to serve its specific function optimally without compromising the other.
Solution Approach 2:
Different regions of the end mill body are given different flute depths according to their specific functional requirements. The first flute region has greater depth for chip discharge performance, while the second flute region has lesser depth for rigidity, creating local quality variations that optimize overall performance.
2Manufacturing precision
If the end mill body is made more rigid to withstand orthogonal resistance in shouldering process, then machining accuracy is maintained, but chip discharge capacity is reduced
Solution Approach 1:
The dual-flute design with varying depths segments the chip discharge function from the structural support function, allowing the shallower second flute to maintain body rigidity for machining accuracy while the deeper first flute provides adequate chip discharge capacity.
Solution Approach 2:
The flute depth parameter is varied between the first and second flutes to balance competing requirements. By changing the depth parameter locally rather than uniformly, the design achieves both sufficient chip discharge capacity and adequate body rigidity.
Data Source
AI summary
An end mill includes a bar-shaped body, a cutting edge, a gash, a first flute, and a second flute. The body extends from a first end to a second end along a rotation axis. The cutting edge is located at a side of the first end of the body. The gash is located adjacent to the cutting edge. The first flute surrounds the gash and spirally extends from the gash toward the second end. The second flute surrounds the first flute and spirally extends from the first flute toward the second end. A depth of the first flute is greater than a depth of the second flute in a cross section orthogonal to the rotation axis.