Tapered Milling Cutter Core for Chip Evacuation and Rigidity
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Solution Overview
Problem
Existing end milling cutter designs face a tradeoff between achieving optimal chip removal characteristics and tool rigidity, with limited design flexibility to balance these factors effectively.
Innovation Solution
A rotary milling cutter design featuring a core with two portions of different diameters, where the second core portion has a larger diameter than the first, and a transition portion with a greater cone angle or concave shape to facilitate chip removal and reduce bending, optimizing both chip evacuation and rigidity by distributing metal effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the core diameter is increased to improve tool rigidity, then tool rigidity is improved, but chip removal capability deteriorates
Solution Approach 1:
The core is divided into multiple portions with different diameters along the axial direction. The first core portion has a larger diameter for rigidity, while the second core portion has a smaller diameter for chip removal. This segmentation allows each portion to be optimized for its specific function, resolving the contradiction between rigidity and chip removal capability.
Solution Approach 2:
Different sections of the core are given different diameters to match local requirements. The proximal section (first core portion) has larger diameter where rigidity is needed near the tool holder, while the distal section (second core portion) has smaller diameter where chip removal is critical. This local differentiation optimizes both competing requirements simultaneously.
2Productivity
If the core diameter is decreased to improve chip removal, then chip removal capability is improved, but tool rigidity deteriorates
Solution Approach 1:
The core is segmented into portions with different diameters, allowing the distal portion to be smaller for chip removal while the proximal portion remains larger for rigidity. This resolves the contradiction by spatially separating the functions of chip removal and structural support.
Solution Approach 2:
The core diameter is locally optimized: smaller diameter in regions requiring chip removal access and larger diameter in regions requiring structural rigidity. This local quality variation allows simultaneous optimization of both chip removal and rigidity.
3Ease of manufacture
If a constant diameter core is used, then manufacturing is simplified, but design flexibility deteriorates
Solution Approach 1:
The core is segmented into portions with different diameters, providing design flexibility to optimize chip removal and rigidity. The segmented design is manufactured using standard turning and milling processes, maintaining ease of manufacture while achieving superior functional performance.
4Strength
If more metal is provided at portions subjected to greatest bending moment, then tool rigidity is improved, but chip removal space deteriorates
Solution Approach 1:
The core diameter is locally varied to provide more metal (larger diameter) at the proximal portion where bending moments are greatest, while providing less metal (smaller diameter) at the distal portion to maximize chip removal space. This local differentiation resolves the contradiction between rigidity reinforcement and chip removal space.
Data Source
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AI summary
A rotary milling cutter (21) includes a core (23) and a plurality of teeth (25) extending from the core (23). The core (23) includes a first core portion (27) having a first end (29) proximate a distal end (31) of the cutter and a second core portion (33), a smallest diameter (DS2) of the second core portion (33) being larger than a largest diameter (DL1) of the first core portion (27). At least one of the first core portion (27) and the second core portion (33) increases in diameter in a direction away from the distal end (31) of the cutter (21).A transition portion (47) extends a non-zero axial distance between the first core portion (27) and the second core portion (33), and comprises a single cone angle that is greater than the cone angle (CA1 or CA2) of the at least one of the first and second core portions (27 and 33), or a gradual, concave transition from the cone angle (CA1) at a second end (49) of the first core portion (27) to a conical or concave portion adjacent a first end (51) of the second core portion (33).