Cutting Element Non-Planar Interface Reduces Delamination
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Solution Overview
Problem
Cutting elements used in machinery like drill bits and crushers often experience delamination and fracture due to intense forces and temperature differentials, leading to reduced efficacy and wear life, particularly at the interface between the ceramic layer and carbide segment.
Innovation Solution
A cutting element with a cemented metal carbide segment bonded to a superhard material at a non-planar interface, where the superhard material volume is 75% to 150% of the carbide segment volume, and a braze material with a specific melting temperature is used to attach a second carbide segment, optimizing the geometry and bonding to enhance durability and reduce stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar interface is used between the ceramic layer and carbide segment, then the manufacturing process is simple, but delamination and fracture occur under intense forces and temperature differentials
Solution Approach 1:
The patent applies asymmetry by transitioning from a planar interface to a non-planar interface between the ceramic layer and carbide segment. The non-planar interface creates an asymmetric geometry that interlocks the two materials, preventing delamination and fracture under intense forces and temperature differentials while maintaining manufacturing feasibility through molding or bonding processes.
Solution Approach 2:
The patent implements curvature by using a non-planar interface instead of a flat surface. The curved or rounded interface geometry distributes stresses more evenly across the bonding area between the ceramic layer and carbide segment, reducing stress concentration points that would lead to delamination and fracture under thermal and mechanical loading.
2Weight of moving object
If the superhard material volume is small, then the cutting element is lighter and easier to handle, but wear resistance and durability are reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the volume ratio of superhard material to carbide segment. The superhard material volume is set between 75% and 150% of the carbide segment volume, creating an optimal balance where sufficient superhard material provides wear resistance and durability, while the overall size remains manageable for drilling and crushing applications.
3Strength
If a non-planar interface is used between superhard material and carbide segment, then stress distribution and bonding strength are improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements curvature by using a non-planar interface instead of a flat surface. The curved or rounded interface geometry distributes stresses more evenly across the bonding area between the ceramic layer and carbide segment, reducing stress concentration points that would lead to delamination and fracture under thermal and mechanical loading.
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 solution significantly improves the wear resistance and durability of the cutting element, reducing delamination and fracture, thereby extending the tool's life and maintaining cutting efficiency under harsh conditions.
Implementation Method 1
The segments and adjacent diamond crystal layers are then compressed under HPHT conditions which promotes a sintering of the diamond grains to form the polycrystalline diamond structure. As a result, the diamond grains become mutually bonded to form a diamond layer over the substrate face, which is also bonded to the substrate face.
Implementation Method 2
The tip also has a second carbide segment attached to the tip with a braze material having a melting temperature from 700 to 1200 degrees Celsius.
Data Source
AI summary
In one aspect of the invention, a tool has a wear-resistant base suitable for attachment to a driving mechanism and also a hard tip attached to an interfacial surface of the base. The tip has a first cemented metal carbide segment bonded to a superhard material at a non-planar interface. A volume of the superhard material is about 75% to 150% of a volume of the first cemented metal carbide segment.