Polycrystalline Cutter With Segmented Cutting Edges
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Solution Overview
Problem
Current polycrystalline diamond (PCD) cutters for rock drilling drag bits have limited abrasion resistance and impact strength, leading to reduced cost-effectiveness and drill bit stability, as improvements in these areas are difficult to achieve without compromising material properties.
Innovation Solution
A cutting element with multiple cutting edges formed into the outer circumference of a superabrasive layer, where troughs are machined into the layer using EDM, providing additional cutting points and edges that increase the cutter's abrasion resistance and impact strength without altering the material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional single-point PCD cutters are used, then the structure is simple and manufacturing is easy, but the abrasion resistance and impact strength are limited
Solution Approach 1:
The cutter surface is segmented into multiple cutting points (at least three) distributed across the end face and peripheral surface, rather than using a single cutting point. This segmentation allows the cutting load to be distributed across multiple points, enhancing abrasion resistance and impact strength while maintaining a relatively simple overall cutter structure.
Solution Approach 2:
Different regions of the cutter are given different functions: the end face contains cutting points for primary cutting action, while the peripheral surface contains additional cutting points that engage after wear occurs. This local differentiation optimizes both the cutting performance and the durability of the cutter without requiring complete structural redesign.
2Duration of action of moving object
If traditional single-point cutters are used, then the initial cutting action is straightforward, but the cutter lifetime is reduced due to rapid wear
Solution Approach 1:
The cutter is pre-configured with multiple cutting points that are strategically positioned so that as the cutter wears during operation, new cutting points progressively engage with the rock surface. This preliminary arrangement ensures continuous cutting action and extends cutter lifetime without sacrificing initial rate of penetration.
Solution Approach 2:
The multiple cutting points are arranged to provide continuous cutting action throughout the cutter's life. As some cutting points wear down, others remain active or become active, ensuring that the cutter maintains effective cutting capability throughout its service life rather than experiencing sudden failure or significant performance degradation.
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 multiple cutting edges enhance the cutter's lifetime, rate of penetration, and drill bit stability by distributing cutting stress and introducing new cutting points as the cutter wears, resulting in improved performance and extended usage.
Implementation Method 1
a catalyzing material used to bond the abrasive particles together
Implementation Method 2
The trough may be machined into the layer by electric discharge machining (EDM)
Data Source
AI summary
A cutting element includes a layer of integrally bonded superabrasive particles disposed over a substrate. The layer has an outer circumference comprising at least one trough having a distinct cutting point on either side of the trough. A rock drilling drag bit incorporating the cutting element and a method of cutting a material using the cutting element are also disclosed.