Milling Tool Chip Room Geometry for Insert Fit and Tool Strength
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Solution Overview
Problem
Metal cutting milling tools face a compromise between insert fit and chip removal, leading to strength issues due to the need for adequate chip room space, which often results in reduced tool strength.
Innovation Solution
The milling tool features a body with axially extending land portions and chip rooms, where the radius of the chip room curvature varies along the tool's axis, allowing for a deep chip room at the front end and a shallower one further back, optimizing strength while maintaining sufficient space for inserts and chip transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the chip room is made large enough to accommodate cutting inserts and transport chips, then chip removal capability is improved, but the strength of the milling tool decreases
Solution Approach 1:
The chip room cross-sectional area varies along the axial direction, with a larger area at the front end for insert accommodation and chip collection, and a smaller area toward the rear end. This local variation in geometry allows sufficient chip room capacity where needed while preserving material and strength in critical structural areas.
Solution Approach 2:
The chip room features a curved bottom surface with a defined radius of curvature, creating a rounded, space-efficient geometry that maximizes chip accommodation volume while minimizing material removal from the tool body. The curved design also reduces stress concentration compared to sharp corners.
2Volume of stationary object
If material is removed to create chip room space, then chip accommodation is improved, but the milling tool strength is reduced
Solution Approach 1:
Material is selectively removed only in the non-critical regions where the chip room is needed, while maintaining full material presence in critical load-bearing areas. The chip room cross-section tapers axially, removing material where it least impacts overall tool strength.
Solution Approach 2:
The curved bottom surface of the chip room with optimized radius creates a compact, space-efficient volume that maximizes chip capacity while minimizing the amount of material that needs to be removed from the tool body.
Data Source
Figure 1~2
Figure 3
Figure 4a~4c
AI summary
A metal cutting milling tool 100, comprising: a body that is rotatable around a central axis C in a rotational direction; wherein the body comprises: a front end 106, a plurality of land portions 156 extending axially rearwards from the front end 106, a plurality of chip rooms 146 extending axially rearwards from the front end, wherein each land portion 156 of the plurality of land portions is delimited by a leading 157 and a trailing surface 158 in the rotational direction, wherein the leading surface 157 is rotationally ahead of the trailing surface 158 and wherein each land portion 156, as part of the leading surface 157 in a radially outer and forward region, comprises an insert seat 110 for receiving a cutting insert 114; each chip room 146 of the plurality of chip rooms is positioned between two adjacent land portions 156 of the plurality of land portions, wherein each chip room 146 is delimited by a chip room surface comprising the trailing surface 157 of first land portion 156, the leading surface 157 of a second land portion 156 and a bottom surface positioned between the trailing surface 158 and the leading surface 157, wherein the first land portion 156 is rotationally ahead of the second land portion 156, wherein as seen in a cross section perpendicular to the central axis C each chip room surface has a curvature with a smallest radius r, characterized in that the smallest radius r2 in a second cross section and the smallest radius r3 in a third cross section are larger than the smallest radius r1 in a first cross section, wherein the first cross section is axially forward of the second cross section and the third cross section.