Cutting Insert Protrusion Layout for Chip Discharge
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Solution Overview
Problem
Existing cutting inserts face challenges with chip discharge performance during grooving processes due to chip accumulation between projections, leading to inefficient chip removal.
Innovation Solution
A cutting insert design featuring an upper surface with a continuous end rake surface, paired front and intermediate protrusions, and a rear protrusion, where the protrusions are strategically positioned and inclined to guide and deform chips effectively, ensuring stable discharge across varying feed rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple breaker projections with increased height stepwise are arranged as departing from an end flank surface, then chip deformation capability is improved, but chip discharge performance deteriorates due to chip accumulation between projections
Solution Approach 1:
The breaker projection is divided into multiple stages (first stage, second stage, third stage) with progressively increasing heights. Each stage performs partial chip deformation, allowing chips to be gradually controlled and directed toward discharge paths rather than accumulating between projections.
Solution Approach 2:
The invention introduces a new dimensional arrangement by positioning the third stage projection laterally adjacent to the first and second stage projections rather than solely behind them. This spatial reconfiguration creates open discharge pathways while maintaining effective chip deformation across all three stages.
2Reliability
If a third stage projection with larger height is located behind the first and second stage projections, then chip control capability is improved, but chip flow is blocked causing chips to stay between projections
Solution Approach 1:
The third stage projection is positioned asymmetrically adjacent to the first and second stage projections rather than symmetrically behind them. This asymmetric arrangement creates uneven spacing that facilitates chip discharge pathways while maintaining effective chip control through the staggered projection heights.
Solution Approach 2:
The first and second stage projections act as intermediaries between the cutting edge and the third stage projection. They progressively deform and guide chips toward the discharge area, preventing direct blockage by the third stage projection while maintaining effective chip control through the staged deformation process.
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(b)
Figure 3(a)~3(c)
AI summary
A cutting insert 1 of one embodiment of the present invention includes an upper surface 2, a side surface 4 having a front clearance surface 4a, and an end cutting edge 5a located along an intersection of the upper surface 2 and the front clearance surface 4a. The upper surface 2 includes an end rake surface 21a that is inclined downward as departing from the end cutting edge 5a, a pair of front protrusions 22a that is located apart from the end cutting edge 5a and are less apart from each other as departing from the end cutting edge 5a, a rear protrusion 22c located further apart from the end cutting edge 5a than the pair of front protrusions 22a, and a pair of intermediate protrusions 22b that is at least partially located between the pair of front protrusions 22a and the rear protrusion 22c. Top portions 22b2 of the pair of intermediate protrusions 22b are respectively located between the pair of front protrusions 22a and the rear protrusion 22c, and are higher than top portions 22a2 of the front protrusions 22a and a top portion 22c2 of the rear protrusion 22c.