Cutting Insert Rising Surface Layout for Stable Chip Flow
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Solution Overview
Problem
Existing cutting inserts face challenges in efficiently machining metal workpieces due to inadequate chip dischargeability and surface accuracy, particularly under varying cutting depths and feed rates.
Innovation Solution
The cutting insert features a rod-shaped main body with a laterally protruding cutting portion having a triangular rake face and inclined rising surfaces, optimized with specific rake angles and chip-breaking surfaces to enhance chip flow control and dischargeability, allowing for stable machining across different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional cutting insert design is used, then the structure is simple, but chip dischargeability is poor and machining accuracy decreases
Solution Approach 1:
The rising surface is divided into multiple segments with different inclinations: a first rising surface adjacent to the rake face, a second rising surface at the rear end, and intermediate rising surfaces connecting them. Each segment has a specific inclination angle range (5-15 degrees for the first, 10-20 degrees for the second) to optimize chip flow at different locations, improving chip dischargeability while maintaining machining accuracy
Solution Approach 2:
Different portions of the rising surface are given different geometric properties to perform specific functions: the first rising surface controls chip flow near the cutting edge, the intermediate rising surfaces provide transition and support, and the second rising surface at the rear end ensures complete chip discharge. This localized optimization resolves the contradiction between structural complexity and machining performance
2Productivity
If the rising surface inclination is increased to improve chip dischargeability, then chip flow improves, but machining accuracy deteriorates due to vibration and instability
Solution Approach 1:
The rising surface design creates a dynamic chip control system where chips are progressively guided and constrained by multiple inclined surfaces rather than a single static surface. The intermediate rising surfaces act as transition zones that adapt to varying chip loads and cutting conditions, maintaining stability while improving dischargeability across different machining parameters
Solution Approach 2:
The rising surfaces are designed with curved profiles rather than straight lines, creating smooth transitions that guide chips along optimized paths. The curvature allows chips to follow natural flow patterns while being gradually directed toward discharge points, reducing vibration and maintaining machining accuracy even at higher inclination angles
3Power
If the cutting insert is designed for deep cutting, then cutting capacity increases, but chip dischargeability decreases due to chip entanglement
Solution Approach 1:
The rising surface design adds a longitudinal dimension to chip control by extending the chip guidance path from the rake face through multiple intermediate surfaces to the rear end of the insert. This multi-dimensional approach allows chips from deep cuts to be progressively directed and discharged along the length of the insert, preventing entanglement while maintaining high cutting capacity
Solution Approach 2:
The rising surface is segmented into multiple zones with different inclinations and functions: the first rising surface handles initial chip separation, intermediate rising surfaces provide progressive guidance for deep cut chips, and the second rising surface at the rear end ensures final discharge. This segmentation allows the insert to handle both deep cutting loads and chip discharge requirements simultaneously
Data Source
AI summary
To perform machining on a workpiece under wider variety of machining conditions. A first rising surface is adjacent to a cutting portion across a first surface, the first rising surface being inclined upward away from the first surface in a direction along a center axis and being away from the center axis toward a rear end of a main body. A second rising surface extends from a second surface toward the rear end of the main body, and is inclined upward away from the second surface in the direction along the center axis. In the direction along the center axis, a rear end of the first rising surface is closer to the rear end of the main body than a front end of the second rising surface.