Asymmetric Chip Breaker Geometry for Multi-Blade Machining Tools
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Solution Overview
Problem
Machining tools with multiple blades face durability issues due to chip interference, particularly when chips from different blades contact the breaker from various directions, leading to frequent breakage and difficulty in removing chips from complex hole shapes in workpieces.
Innovation Solution
A machining tool design featuring a rake face with protrusions that have a tapered shape, where the protrusion closest to the second machining blade has a wider inner forming portion and a narrower outer forming portion, enhancing durability by distributing chip forces asymmetrically and reducing the likelihood of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a breaker is made thin and small to avoid interfering with machining, then machining precision is improved, but the breaker becomes susceptible to breakage
Solution Approach 1:
The breaker is designed with an asymmetric cross-sectional shape where the width varies in the radial direction. Specifically, the inner width ( toward the axis) is greater than the outer width (away from the axis), creating an asymmetric structure that provides enhanced strength on the inner side while maintaining a compact overall form that does not interfere with machining operations.
2Productivity
If a machining tool has multiple types of blades to process multiple portions, then productivity is improved, but chips from different blades contact the breaker from different directions causing breakage
Solution Approach 1:
The asymmetric cross-sectional design with greater inner width provides enhanced structural strength on the inner side where chips from multiple blades converge. This asymmetric reinforcement allows the breaker to withstand contact forces from different directions generated by multiple blades while maintaining the productivity benefits of having multiple blade types.
Solution Approach 2:
The breaker cross-section is segmented into different width zones (inner width and outer width) with different structural characteristics. This segmentation allows each zone to handle different types of chip forces, with the wider inner zone absorbing forces from multiple blade directions and the narrower outer zone maintaining compact dimensions.
3Productivity
If chips are wide or long, then machining capability is improved, but chips are difficult to remove by cleaning
Solution Approach 1:
Instead of trying to prevent chip formation or using complex chip breaking mechanisms, the invention inverts the approach by designing the breaker shape to actively guide and direct chips toward easy removal paths. The asymmetric width configuration helps channel chips in a specific direction that facilitates their removal from the workpiece during cleaning operations.
Data Source
AI summary
A machining tool is rotated around an axis and includes a machining blade portion having a first machining blade in the distal end direction with respect to a rake face and a second machining blade located in the radially outward direction with respect to the rake face, and a protrusion formed on the rake face and having a tip for cutting chips coming from the first machining blade. The protrusion includes an inner forming portion that is located in the radially inward direction from the reference line and an outer forming portion that is located in the radially outward direction from the reference line, and the width of the inner forming portion is wider than the width of the outer forming portion.