Cutting Insert Ridges for Crater Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cutting inserts suffer from crater wear on the rake surface, leading to chipping and reduced tool life, as the breaker protruding portion is positioned farther away from the cutting edge, compromising chip control performance.
Innovation Solution
The cutting insert features at least two ridges on the rake surface that extend from the cutting edge portion towards the straight-line shaped cutting edge portion, efficiently separating chips and reducing crater wear without compromising chip control performance, thereby extending tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the breaker protruding portion is positioned farther away from the cutting edge, then chip control performance is maintained, but crater wear on the rake surface increases and tool life decreases
Solution Approach 1:
The invention divides the rake surface into multiple functional zones by adding ridges that segment the chip flow path. The ridges create distinct regions: a first region for initial chip deflection, a second region for further chip control, and a third region near the cutting edge. This segmentation allows each zone to perform specific functions in sequence, enabling effective chip control while protecting the rake surface from direct chip contact and crater wear.
Solution Approach 2:
The invention applies local quality by creating ridges with specific geometric features at particular locations on the rake surface. The ridges have varying heights, angles, and positions tailored to local requirements: the first ridge has a specific height and angle for initial chip deflection, while the second ridge has different dimensions for subsequent chip control. This localized optimization allows different portions of the rake surface to have different functions, enabling both chip control and wear prevention.
2Ease of operation
If the rake surface is made smooth for easy chip flow, then chip control is improved, but crater wear generation is facilitated
Solution Approach 1:
The ridges segment the previously smooth rake surface into multiple controlled zones. Instead of a single smooth surface that allows unrestricted chip flow and direct contact with the rake surface, the ridges create a stepped structure with multiple regions. Chips flow through these segmented zones in sequence, with each ridge providing controlled deflection and protection, thereby maintaining ease of chip flow while preventing direct contact with the rake surface.
Solution Approach 2:
The ridges act as intermediary structures between the chips and the rake surface. Rather than allowing chips to flow directly over the smooth rake surface (which causes crater wear), the ridges serve as intermediate elements that guide and control chip flow. The ridges intercept chips and redirect them, preventing direct contact between chips and the vulnerable rake surface while still maintaining smooth chip flow through the structured path.
3Reliability
If ridges are added to the rake surface to prevent crater wear, then tool life is extended, but chip control performance may deteriorate
Solution Approach 1:
The invention carefully designs the ridges with specific local qualities optimized for both wear prevention and chip control. Each ridge has precisely controlled dimensions: the first ridge has a height of 0.1-0.5mm and an angle of 5-15 degrees, while the second ridge has a height of 0.05-0.3mm and an angle of 3-10 degrees. These localized geometric optimizations ensure that the ridges provide adequate protection against crater wear while maintaining smooth chip flow and effective chip control through the structured path.
Solution Approach 2:
The invention optimizes specific parameters of the ridges to balance wear prevention and chip control. The ridge heights, angles, and positions are carefully selected within specific ranges to achieve the desired performance. By adjusting these parameters, the invention ensures that the ridges are sufficiently prominent to protect the rake surface from crater wear, yet sufficiently smooth and properly positioned to maintain excellent chip control performance without disrupting chip flow.
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
The ridges effectively reduce crater wear on the rake surface, enhancing tool life by limiting chip contact and heat transmission, while maintaining excellent chip control performance even under high feed rates.
Implementation Method 1
the ridges, a chip generated in a cutting work can be forcibly, efficiently separated away from the rake surface
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cutting insert (1) of an aspect of the present invention includes at least one cutting edge (8) formed on an intersecting ridge line portion between a rake surface (6) and a flank (7), and at least one ridge (12). The cutting edge includes a cutting edge portion (9) extending along a corner portion (5) and a straight-line shaped cutting edge portion (10) connecting to the cutting edge portion (9). The ridge (12) is formed to rise on the rake surface (6). The ridge (12) extends from a portion of a rake surface inside the cutting edge portion of the corner portion toward a rake surface inside the straight-line shaped cutting edge portion.