Cutting Insert Protruding Section Chip Overflow
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Solution Overview
Problem
Existing cutting inserts face challenges in reliably disposing of cutting chips under various cutting conditions, particularly during medium and finish cuttings, due to premature abrasion and overflow issues related to the design of the standing face and protrusion height.
Innovation Solution
The cutting insert design features a protruding section with a higher top portion and inclined wall surfaces, where cutting chips are guided and curled by the first and second wall surfaces, reducing overflow and abrasion, and includes a rib section to control narrow cutting chips during finish cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standing face protrudes from two top portions of the protrusion to the rake face near the cutting edge, then the standing angle can be formed, but the standing face is prematurely abraded by contacting with cutting chips in medium cutting
Solution Approach 1:
The invention extracts the standing face function from the protrusion top portions and relocates it to the protruding section. The protruding section is positioned farther from the cutting edge than the top portions, allowing the standing face to be formed on this separated structure. This extraction prevents the standing face from being prematurely abraded during medium cutting while maintaining its chip-guiding function.
Solution Approach 2:
The invention changes the positional dimension of the standing face by moving it from the protrusion top portions (near the cutting edge) to the protruding section (farther from the cutting edge). This dimensional relocation allows the standing face to maintain its angle without premature contact with cutting chips during medium cutting operations.
2Reliability
If the protrusion height of the top portion is set small to make the standing angle be in the range, then the standing angle can be formed, but the cutting chips produced in finish cutting overflow out of the protrusion
Solution Approach 1:
The invention introduces the protruding section as an intermediary structure between the cutting edge and the standing face. This intermediary element, positioned farther from the cutting edge, provides additional containment for cutting chips during finish cutting while allowing the standing face to maintain its proper angle. The protruding section acts as a mediator that prevents chip overflow without compromising the standing angle formation.
3Object-generated harmful factors
If the protrusion height is increased to prevent chip overflow, then chips are contained, but the standing face becomes steep and is prematurely abraded in medium cutting
Solution Approach 1:
The invention segments the chip containment function from the standing face and assigns it to the protruding section. The protruding section, with its greater protrusion height, provides chip containment during finish cutting, while the standing face on the protrusion top portions maintains a manageable angle for medium cutting operations. This segmentation allows both functions to operate independently without compromising each other.
Data Source
Figure 1
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AI summary
In a cutting insert (1), a cutting edge (4) is formed on a peripheral border of a rake face (2); a protruding section (5) is formed on the rake face (2); a pair of convex sections (7) is formed so as to extend toward the cutting edge (4); the convex sections (7) face toward a corner portion (4A); the convex sections (7) include first wall surfaces (7A) and second wall surfaces (7B); the first wall surfaces (7A) and the second wall surfaces (7B) are inclined surfaces that are inclined toward the rake face (2) as those are farther from ridgelines (M) intersecting with each other; and the intersection ridgelines (M) intersect with a wall surface (5B) of the protruding section (5), at a position lower than a top portion (5A) of the protruding section (5) in the corner portion (4A) side.