Superhard Cutting Element Geometry for Chip Breaking and Edge Life
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Solution Overview
Problem
Cutting elements used in drilling and machining applications are susceptible to chipping, cracking, or partial fracturing due to high forces and temperatures, leading to reduced efficiency and premature failure.
Innovation Solution
A cutting element with a superhard polycrystalline material bonded to a substrate, featuring a working surface with spaced cutting edges and a radius of curvature less than the substrate, designed to divert chips and act as a chip breaker, formed through ultra-high pressure and temperature sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting elements are subjected to high forces and temperatures during drilling operations, then cutting efficiency is maintained, but chipping, cracking, or partial fracturing occurs leading to premature failure
Solution Approach 1:
The patent applies different radii of curvature to different regions of the cutting element. The cutting edges have a first radius of curvature optimized for cutting efficiency, while the peripheral side edge has a second, larger radius of curvature to reduce stress concentration and prevent chipping. This local differentiation of geometric properties allows the cutting element to simultaneously achieve high cutting efficiency and improved reliability against fracture.
2Productivity
If the cutting edge radius of curvature is reduced to improve cutting efficiency, then penetration rate increases, but the cutting edge becomes more susceptible to chipping
Solution Approach 1:
The patent segments the cutting element into distinct functional zones with different geometric properties. The cutting edges are optimized with a smaller first radius of curvature for efficient material removal, while the peripheral side edge is designed with a larger second radius of curvature for structural integrity. This segmentation allows each region to be optimized for its specific function without compromising the other.
3Ease of manufacture
If conventional cutting elements are used with planar surfaces, then manufacturing is simplified, but chip flow control is poor leading to increased chipping
Solution Approach 1:
The patent introduces curved surfaces to the cutting element geometry. The peripheral side edge has a radius of curvature that causes chips to curl and break as they are formed, improving chip flow control. This curvature is achieved through the sintering process using compact geometry, maintaining ease of manufacture while significantly improving reliability through better chip evacuation and reduced chip-induced chipping.
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
Enhances resistance to chipping and spalling, improving cutting efficiency and extending the working life of the cutting element by maintaining load at the cutter-rock contact point and controlling chip flow.
Implementation Method 1
a body of superhard polycrystalline material bonded to the substrate along an interface
Implementation Method 2
the cutting edges have an associate radius of curvature, the radius of curvature of one or more of the cutting edges being less than the radius of curvature of the substrate
Data Source
AI summary
A cutting element includes a substrate having a peripheral side edge, the peripheral side edge having an associated radius of curvature; and a body of superhard polycrystalline material bonded to the substrate along an interface, the body of superhard polycrystalline material having a peripheral side edge and a longitudinal axis. The body of superhard polycrystalline material has a working surface; and a plurality of spaced apart cutting edges extending to the working surface through respective chamfer portions, the cutting edges being spaced around the working surface by a further region. The cutting edges have an associated radius of curvature, the radius of curvature of one or more of the cutting edges being less than the radius of curvature of the substrate. A method of making such a cutting element is also disclosed.