Cutting Insert Chipbreaker Ramps for Lower Cutting Forces
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Solution Overview
Problem
Existing cutting inserts for chip-forming machining face issues with increased pressure leading to premature wear and unsatisfactory cutting quality, particularly during rough machining with varying feed rates and cutting speeds.
Innovation Solution
The cutting insert features sliding ramps on both sides of longitudinally rib-shaped chip-forming elements that end in a wedge shape, providing a lower friction surface for chip support and deformation, along with a central raised chip surface plateau or sharply rising rib comb to facilitate chip breakage, reducing cutting forces and friction during chip drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a widely protruding chip breaker step is arranged in the corner area, then chip formation is improved, but increased pressure is generated leading to premature wear
Solution Approach 1:
The patent applies local quality by providing different surface characteristics in different regions of the chip breaker. The sliding ramps have a smooth, low-friction surface specifically where chips contact during discharge, while other areas maintain the traditional chip breaker geometry for effective chip formation and breaking. This localized differentiation reduces overall cutting forces while preserving chip control.
Solution Approach 2:
The patent replaces the traditional high-friction mechanical contact between chips and the chip breaker surface with a low-friction sliding ramp surface. This substitution reduces the mechanical resistance and cutting forces required for chip discharge, thereby extending tool life without compromising chip formation quality.
2Object-generated harmful factors
If traditional chip breakers are used, then chip formation is achieved, but friction during chip drainage is high
Solution Approach 1:
The sliding ramps introduce a localized low-friction surface specifically in the chip discharge path. This smooth surface reduces friction where chips slide off the chip breaker, minimizing heat generation and wear on the cutting edge while maintaining effective chip breaking in other areas.
Solution Approach 2:
The patent substitutes the traditional high-friction chip breaker surface with engineered sliding ramps that provide a low-friction interface for chip discharge. This reduces the harmful frictional forces and associated wear on the cutting edge, improving overall tool reliability.
3Manufacturing precision
If chip-forming elements with high deformation capability are used, then chip formation is improved, but cutting forces increase
Solution Approach 1:
The patent differentiates between regions requiring high deformation (chip formation area) and regions requiring low friction (chip discharge area). The sliding ramps provide a smooth, low-deformation zone that allows chips to slide off easily after formation, reducing the total cutting force required while maintaining chip formation quality in the deformation zone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces cutting forces and friction, allowing for effective chip runoff with minimized wear on the cutting edge, suitable for rough machining operations with high feed rates and large cutting depths in various materials.
Implementation Method 1
the sliding ramps serve as a support surface for the chip with a significantly lower friction surface
Implementation Method 2
the longitudinal rib, which extends beyond the sliding ramps on both sides, provides chip deformation
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a cutting insert for machining a workpiece by chip formation, in particular for roughing, the at least one-sided top surface of which forms the rake face (10) and the circumferential side surfaces of which form the clearance faces (11), wherein the rake face has at least one raised longitudinal rib-shaped chip forming element (16) with a rib comb (161) in a chip forming groove (15) extending parallel to the cutting edge (12), which, viewed from above, tapers in a wedge shape and has a rounded tip in the direction of the cutting edge. To reduce the cutting forces, it is proposed that sliding ramps (17, 18) be arranged on both sides of the longitudinal rib-shaped chip forming element, which, viewed in longitudinal cross-section, taper in a wedge shape onto the rake face and have an upper roof surface (172, 182) which, viewed in cross-section, is linear and extends at a height below the rib comb.